new yaml parser, runner

engine/compiler/builtin/alias.go

@@ -0,0 +1,29 @@
+package builtin
+
+import (
+	"fmt"
+
+	"github.com/drone/drone/engine/compiler/parse"
+)
+
+type aliasOp struct {
+	visitor
+	index  map[string]string
+	prefix string
+	suffix int
+}
+
+func NewAliasOp(prefix string) Visitor {
+	return &aliasOp{
+		index: map[string]string{},
+		prefix: prefix,
+	}
+}
+
+func (v *aliasOp) VisitContainer(node *parse.ContainerNode) error {
+	v.suffix++
+
+	node.Container.Alias = node.Container.Name
+	node.Container.Name = fmt.Sprintf("%s_%d", v.prefix, v.suffix)
+	return nil
+}

engine/compiler/builtin/args.go

@@ -0,0 +1,90 @@
+package builtin
+
+import (
+	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
+
+	"github.com/drone/drone/engine/compiler/parse"
+
+	json "github.com/ghodss/yaml"
+	"gopkg.in/yaml.v2"
+)
+
+type argsOps struct {
+	visitor
+}
+
+// NewArgsOp returns a transformer that provides the plugin node
+// with the custom arguments from the Yaml file.
+func NewArgsOp() Visitor {
+	return &argsOps{}
+}
+
+func (v *argsOps) VisitContainer(node *parse.ContainerNode) error {
+	switch node.NodeType {
+	case parse.NodePlugin, parse.NodeCache, parse.NodeClone:
+		break // no-op
+	default:
+		return nil
+	}
+	if node.Container.Environment == nil {
+		node.Container.Environment = map[string]string{}
+	}
+	return argsToEnv(node.Vargs, node.Container.Environment)
+}
+
+// argsToEnv uses reflection to convert a map[string]interface to a list
+// of environment variables.
+func argsToEnv(from map[string]interface{}, to map[string]string) error {
+
+	for k, v := range from {
+		t := reflect.TypeOf(v)
+		vv := reflect.ValueOf(v)
+
+		k = "PLUGIN_" + strings.ToUpper(k)
+
+		switch t.Kind() {
+		case reflect.Bool:
+			to[k] = strconv.FormatBool(vv.Bool())
+
+		case reflect.String:
+			to[k] = vv.String()
+
+		case reflect.Int, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int8:
+			to[k] = fmt.Sprintf("%v", vv.Int())
+
+		case reflect.Float32, reflect.Float64:
+			to[k] = fmt.Sprintf("%v", vv.Float())
+
+		// case reflect.Int, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int8:
+		// 	to[k] = strconv.FormatInt(vv.Int(), 16)
+
+		// case reflect.Float32, reflect.Float64:
+		// 	to[k] = strconv.FormatFloat(vv.Float(), 'E', -1, 64)
+
+		case reflect.Map:
+			yml, _ := yaml.Marshal(vv.Interface())
+			out, _ := json.YAMLToJSON(yml)
+			to[k] = string(out)
+
+		case reflect.Slice:
+			out, _ := yaml.Marshal(vv.Interface())
+
+			in := []string{}
+			err := yaml.Unmarshal(out, &in)
+			if err == nil {
+				to[k] = strings.Join(in, ",")
+			} else {
+				out, err = json.YAMLToJSON(out)
+				if err != nil {
+					println(err.Error())
+				}
+				to[k] = string(out)
+			}
+		}
+	}
+
+	return nil
+}

engine/compiler/builtin/args_test.go

@@ -0,0 +1,46 @@
+package builtin
+
+import (
+	"testing"
+
+	"github.com/drone/drone/engine/compiler/parse"
+	"github.com/drone/drone/engine/runner"
+
+	"github.com/franela/goblin"
+)
+
+func Test_args(t *testing.T) {
+
+	g := goblin.Goblin(t)
+	g.Describe("plugins arguments", func() {
+
+		g.It("should ignore non-plugin containers", func() {
+			root := parse.NewRootNode()
+			c := root.NewShellNode()
+			c.Container = runner.Container{}
+			c.Vargs = map[string]interface{}{
+				"depth": 50,
+			}
+
+			ops := NewArgsOp()
+			ops.VisitContainer(c)
+
+			g.Assert(c.Container.Environment["PLUGIN_DEPTH"]).Equal("")
+		})
+
+		g.It("should include args as environment variable", func() {
+			root := parse.NewRootNode()
+			c := root.NewPluginNode()
+			c.Container = runner.Container{}
+			c.Vargs = map[string]interface{}{
+				"depth": 50,
+			}
+
+			ops := NewArgsOp()
+			ops.VisitContainer(c)
+
+			g.Assert(c.Container.Environment["PLUGIN_DEPTH"]).Equal("50")
+		})
+	})
+
+}

engine/compiler/builtin/build.go

@@ -0,0 +1,40 @@
+package builtin
+
+import (
+	"github.com/drone/drone/engine/compiler/parse"
+	"github.com/drone/drone/engine/runner"
+)
+
+// BuildOp is a transform operation that converts the build section of the Yaml
+// to a step in the pipeline responsible for building the Docker image.
+func BuildOp(node parse.Node) error {
+	build, ok := node.(*parse.BuildNode)
+	if !ok {
+		return nil
+	}
+	if build.Context == "" {
+		return nil
+	}
+
+	root := node.Root()
+	builder := root.NewContainerNode()
+
+	command := []string{
+		"build",
+		"--force-rm",
+		"-f", build.Dockerfile,
+		"-t", root.Image,
+		build.Context,
+	}
+
+	builder.Container = runner.Container{
+		Image:      "docker:apline",
+		Volumes:    []string{"/var/run/docker.sock:/var/run/docker.sock"},
+		Entrypoint: []string{"/usr/local/bin/docker"},
+		Command:    command,
+		WorkingDir: root.Path,
+	}
+
+	root.Services = append(root.Services, builder)
+	return nil
+}

engine/compiler/builtin/cache.go

@@ -0,0 +1,61 @@
+package builtin
+
+import (
+	"github.com/drone/drone/engine/runner"
+	"github.com/drone/drone/engine/compiler/parse"
+)
+
+type cacheOp struct {
+	visitor
+	enable bool
+	plugin string
+	mount  string
+}
+
+// NewCacheOp returns a transformer that configures the default cache plugin.
+func NewCacheOp(plugin, mount string, enable bool) Visitor {
+	return &cacheOp{
+		mount: mount,
+		enable: enable,
+		plugin: plugin,
+	}
+}
+
+func (v *cacheOp) VisitContainer(node *parse.ContainerNode) error {
+	if node.Type() != parse.NodeCache {
+		return nil
+	}
+	if len(node.Vargs) == 0 || v.enable == false {
+		node.Disabled = true
+		return nil
+	}
+
+	if node.Container.Name == "" {
+		node.Container.Name = "cache"
+	}
+	if node.Container.Image == "" {
+		node.Container.Image = v.plugin
+	}
+
+	// discard any other cache properties except the image name.
+	// everything else is discard for security reasons.
+	node.Container = runner.Container{
+		Name: node.Container.Name,
+		Alias: node.Container.Alias,
+		Image: node.Container.Image,
+		Volumes: []string{
+			v.mount + ":/cache",
+		},
+	}
+
+	// this is a hack until I can come up with a better solution.
+	// this copies the clone name, and appends at the end of the
+	// build. When it is executed a second time the build should
+	// have a completed status, so it knows to cache instead
+	// of restore.
+	cache := node.Root().NewCacheNode()
+	cache.Vargs = node.Vargs
+	cache.Container = node.Container
+	node.Root().Script = append(node.Root().Script, cache)
+	return nil
+}

engine/compiler/builtin/cache_test.go

@@ -0,0 +1,37 @@
+package builtin
+
+// import (
+// 	"testing"
+
+// 	"github.com/libcd/libcd"
+// 	"github.com/libcd/libyaml/parse"
+
+// 	"github.com/franela/goblin"
+// )
+
+// func Test_cache(t *testing.T) {
+// 	root := parse.NewRootNode()
+
+// 	g := goblin.Goblin(t)
+// 	g.Describe("cache", func() {
+
+// 		g.It("should use default when nil", func() {
+// 			op := NewCacheOp("plugins/cache:latest", "/tmp/cache")
+
+// 			op.VisitRoot(root)
+// 			g.Assert(root.Cache.(*parse.ContainerNode).Container.Image).Equal("plugins/cache:latest")
+// 			g.Assert(root.Cache.(*parse.ContainerNode).Container.Volumes[0]).Equal("/tmp/cache:/cache")
+// 		})
+
+// 		g.It("should use user-defined cache plugin", func() {
+// 			op := NewCacheOp("plugins/cache:latest", "/tmp/cache")
+// 			cache := root.NewCacheNode()
+// 			cache.Container = libcd.Container{}
+// 			cache.Container.Image = "custom/cacher:latest"
+// 			root.Cache = cache
+
+// 			op.VisitRoot(root)
+// 			g.Assert(cache.Container.Image).Equal("custom/cacher:latest")
+// 		})
+// 	})
+// }

engine/compiler/builtin/clone.go

@@ -0,0 +1,45 @@
+package builtin
+
+import (
+	"github.com/drone/drone/engine/compiler/parse"
+	"github.com/drone/drone/engine/runner"
+)
+
+type cloneOp struct {
+	visitor
+	plugin string
+	enable bool
+}
+
+// NewCloneOp returns a transformer that configures the default clone plugin.
+func NewCloneOp(plugin string, enable bool) Visitor {
+	return &cloneOp{
+		enable: enable,
+		plugin: plugin,
+	}
+}
+
+func (v *cloneOp) VisitContainer(node *parse.ContainerNode) error {
+	if node.Type() != parse.NodeClone {
+		return nil
+	}
+	if v.enable == false {
+		node.Disabled = true
+		return nil
+	}
+
+	if node.Container.Name == "" {
+		node.Container.Name = "clone"
+	}
+	if node.Container.Image == "" {
+		node.Container.Image = v.plugin
+	}
+
+	// discard any other cache properties except the image name.
+	// everything else is discard for security reasons.
+	node.Container = runner.Container{
+		Name: node.Container.Name,
+		Image: node.Container.Image,
+	}
+	return nil
+}

engine/compiler/builtin/clone_test.go

@@ -0,0 +1,36 @@
+package builtin
+
+// import (
+// 	"testing"
+
+// 	"github.com/libcd/libcd"
+// 	"github.com/libcd/libyaml/parse"
+
+// 	"github.com/franela/goblin"
+// )
+
+// func Test_clone(t *testing.T) {
+// 	root := parse.NewRootNode()
+
+// 	g := goblin.Goblin(t)
+// 	g.Describe("clone", func() {
+
+// 		g.It("should use default when nil", func() {
+// 			op := NewCloneOp("plugins/git:latest")
+
+// 			op.VisitRoot(root)
+// 			g.Assert(root.Clone.(*parse.ContainerNode).Container.Image).Equal("plugins/git:latest")
+// 		})
+
+// 		g.It("should use user-defined clone plugin", func() {
+// 			op := NewCloneOp("plugins/git:latest")
+// 			clone := root.NewCloneNode()
+// 			clone.Container = libcd.Container{}
+// 			clone.Container.Image = "custom/hg:latest"
+// 			root.Clone = clone
+
+// 			op.VisitRoot(root)
+// 			g.Assert(clone.Container.Image).Equal("custom/hg:latest")
+// 		})
+// 	})
+// }

engine/compiler/builtin/envs.go

@@ -0,0 +1,57 @@
+package builtin
+
+import (
+	"os"
+	"strings"
+
+	"github.com/drone/drone/engine/compiler/parse"
+)
+
+var (
+	httpProxy  = os.Getenv("HTTP_PROXY")
+	httpsProxy = os.Getenv("HTTPS_PROXY")
+	noProxy    = os.Getenv("NO_PROXY")
+)
+
+type envOp struct {
+	visitor
+	envs map[string]string
+}
+
+// NewEnvOp returns a transformer that sets default environment variables
+// for each container, service and plugin.
+func NewEnvOp(envs map[string]string) Visitor {
+	return &envOp{
+		envs: envs,
+	}
+}
+
+func (v *envOp) VisitContainer(node *parse.ContainerNode) error {
+	if node.Container.Environment == nil {
+		node.Container.Environment = map[string]string{}
+	}
+	v.defaultEnv(node)
+	v.defaultEnvProxy(node)
+	return nil
+}
+
+func (v *envOp) defaultEnv(node *parse.ContainerNode) {
+	for k, v := range v.envs {
+		node.Container.Environment[k] = v
+	}
+}
+
+func (v *envOp) defaultEnvProxy(node *parse.ContainerNode) {
+	if httpProxy != "" {
+		node.Container.Environment["HTTP_PROXY"] = httpProxy
+		node.Container.Environment["http_proxy"] = strings.ToUpper(httpProxy)
+	}
+	if httpsProxy != "" {
+		node.Container.Environment["HTTPS_PROXY"] = httpsProxy
+		node.Container.Environment["https_proxy"] = strings.ToUpper(httpsProxy)
+	}
+	if noProxy != "" {
+		node.Container.Environment["NO_PROXY"] = noProxy
+		node.Container.Environment["no_proxy"] = strings.ToUpper(noProxy)
+	}
+}

engine/compiler/builtin/envs_test.go

@@ -0,0 +1,45 @@
+package builtin
+
+import (
+	"testing"
+
+	"github.com/drone/drone/engine/compiler/parse"
+	"github.com/drone/drone/engine/runner"
+
+	"github.com/franela/goblin"
+)
+
+func Test_env(t *testing.T) {
+	root := parse.NewRootNode()
+
+	g := goblin.Goblin(t)
+	g.Describe("environment variables", func() {
+
+		g.It("should be copied", func() {
+			envs := map[string]string{"CI": "drone"}
+
+			c := root.NewContainerNode()
+			c.Container = runner.Container{}
+			op := NewEnvOp(envs)
+
+			op.VisitContainer(c)
+			g.Assert(c.Container.Environment["CI"]).Equal("drone")
+		})
+
+		g.It("should include http proxy variables", func() {
+			httpProxy = "foo"
+			httpsProxy = "bar"
+			noProxy = "baz"
+
+			c := root.NewContainerNode()
+			c.Container = runner.Container{}
+			op := NewEnvOp(map[string]string{})
+
+			op.VisitContainer(c)
+			g.Assert(c.Container.Environment["HTTP_PROXY"]).Equal("foo")
+			g.Assert(c.Container.Environment["HTTPS_PROXY"]).Equal("bar")
+			g.Assert(c.Container.Environment["NO_PROXY"]).Equal("baz")
+		})
+
+	})
+}

engine/compiler/builtin/filter.go

@@ -0,0 +1,128 @@
+package builtin
+
+import (
+	"path/filepath"
+
+	"github.com/drone/drone/engine/compiler/parse"
+)
+
+type filterOp struct {
+	visitor
+	status   string
+	branch   string
+	event    string
+	environ  string
+	platform string
+	matrix   map[string]string
+}
+
+// NewFilterOp returns a transformer that filters (ie removes) steps
+// from the process based on conditional logic in the yaml.
+func NewFilterOp(status, branch, event, env string, matrix map[string]string) Visitor {
+	return &filterOp{
+		status:  status,
+		branch:  branch,
+		event:   event,
+		environ: env,
+		matrix:  matrix,
+	}
+}
+
+func (v *filterOp) VisitContainer(node *parse.ContainerNode) error {
+	v.visitStatus(node)
+	v.visitBranch(node)
+	v.visitEvent(node)
+	v.visitMatrix(node)
+	v.visitPlatform(node)
+	return nil
+}
+
+// visitStatus is a helpfer function that converts an on_change status
+// filter to either success or failure based on the prior build status.
+func (v *filterOp) visitStatus(node *parse.ContainerNode) {
+	if len(node.Conditions.Status) == 0 {
+		node.Conditions.Status = []string{"success"}
+		return
+	}
+	for _, status := range node.Conditions.Status {
+		if status != "change" && status != "changed" && status != "changes" {
+			continue
+		}
+		var want []string
+		switch v.status {
+		case "success":
+			want = append(want, "failure")
+		case "failure", "error", "killed":
+			want = append(want, "success")
+		default:
+			want = []string{"success", "failure"}
+		}
+		node.Conditions.Status = append(node.Conditions.Status, want...)
+		break
+	}
+}
+
+// visitBranch is a helper function that disables container steps when
+// the branch conditions are not satisfied.
+func (v *filterOp) visitBranch(node *parse.ContainerNode) {
+	if len(node.Conditions.Branch) == 0 {
+		return
+	}
+	for _, pattern := range node.Conditions.Branch {
+		if ok, _ := filepath.Match(pattern, v.branch); ok {
+			return
+		}
+	}
+	node.Disabled = true
+}
+
+// visitEnvironment is a helper function that disables container steps
+// when the deployment environment conditions are not satisfied.
+func (v *filterOp) visitEnvironment(node *parse.ContainerNode) {
+	if len(node.Conditions.Environment) == 0 {
+		return
+	}
+	for _, pattern := range node.Conditions.Environment {
+		if ok, _ := filepath.Match(pattern, v.environ); ok {
+			return
+		}
+	}
+	node.Disabled = true
+}
+
+// visitEvent is a helper function that disables container steps
+// when the build event conditions are not satisfied.
+func (v *filterOp) visitEvent(node *parse.ContainerNode) {
+	if len(node.Conditions.Event) == 0 {
+		return
+	}
+	for _, pattern := range node.Conditions.Event {
+		if ok, _ := filepath.Match(pattern, v.event); ok {
+			return
+		}
+	}
+	node.Disabled = true
+}
+
+func (v *filterOp) visitMatrix(node *parse.ContainerNode) {
+	for key, val := range node.Conditions.Matrix {
+		if v.matrix[key] != val {
+			node.Disabled = true
+			break
+		}
+	}
+}
+
+// visitPlatform is a helper function that disables container steps
+// when the build event conditions are not satisfied.
+func (v *filterOp) visitPlatform(node *parse.ContainerNode) {
+	if len(node.Conditions.Platform) == 0 {
+		return
+	}
+	for _, pattern := range node.Conditions.Platform {
+		if ok, _ := filepath.Match(pattern, v.platform); ok {
+			return
+		}
+	}
+	node.Disabled = true
+}

engine/compiler/builtin/filter_test.go

@@ -0,0 +1,130 @@
+package builtin
+
+// import (
+// 	"testing"
+
+// 	"github.com/franela/goblin"
+// )
+
+// func TestFilter(t *testing.T) {
+// 	g := goblin.Goblin(t)
+// 	g.Describe("Filters", func() {
+
+// 		g.It("Should match no branch filter", func() {
+// 			c := &Container{}
+// 			FilterBranch("feature/foo")(nil, c)
+// 			g.Assert(c.Disabled).IsFalse()
+// 		})
+
+// 		g.It("Should match branch", func() {
+// 			c := &Container{}
+// 			c.Conditions.Branch.parts = []string{"feature/*"}
+// 			FilterBranch("feature/foo")(nil, c)
+// 			g.Assert(c.Disabled).IsFalse()
+// 		})
+
+// 		g.It("Should match branch wildcard", func() {
+// 			c := &Container{}
+// 			c.Conditions.Branch.parts = []string{"feature/*"}
+// 			FilterBranch("feature/foo")(nil, c)
+// 			g.Assert(c.Disabled).IsFalse()
+// 		})
+
+// 		g.It("Should disable when branch filter doesn't match", func() {
+// 			c := &Container{}
+// 			c.Conditions.Branch.parts = []string{"feature/*", "develop"}
+// 			FilterBranch("master")(nil, c)
+// 			g.Assert(c.Disabled).IsTrue()
+// 		})
+
+// 		g.It("Should match no platform filter", func() {
+// 			c := &Container{}
+// 			FilterPlatform("linux_amd64")(nil, c)
+// 			g.Assert(c.Disabled).IsFalse()
+// 		})
+
+// 		g.It("Should match platform", func() {
+// 			c := &Container{}
+// 			c.Conditions.Platform.parts = []string{"linux_amd64"}
+// 			FilterPlatform("linux_amd64")(nil, c)
+// 			g.Assert(c.Disabled).IsFalse()
+// 		})
+
+// 		g.It("Should disable when platform filter doesn't match", func() {
+// 			c := &Container{}
+// 			c.Conditions.Platform.parts = []string{"linux_arm", "linux_arm64"}
+// 			FilterPlatform("linux_amd64")(nil, c)
+// 			g.Assert(c.Disabled).IsTrue()
+// 		})
+
+// 		g.It("Should match no environment filter", func() {
+// 			c := &Container{}
+// 			FilterEnvironment("production")(nil, c)
+// 			g.Assert(c.Disabled).IsFalse()
+// 		})
+
+// 		g.It("Should match environment", func() {
+// 			c := &Container{}
+// 			c.Conditions.Environment.parts = []string{"production"}
+// 			FilterEnvironment("production")(nil, c)
+// 			g.Assert(c.Disabled).IsFalse()
+// 		})
+
+// 		g.It("Should disable when environment filter doesn't match", func() {
+// 			c := &Container{}
+// 			c.Conditions.Environment.parts = []string{"develop", "staging"}
+// 			FilterEnvironment("production")(nil, c)
+// 			g.Assert(c.Disabled).IsTrue()
+// 		})
+
+// 		g.It("Should match no event filter", func() {
+// 			c := &Container{}
+// 			FilterEvent("push")(nil, c)
+// 			g.Assert(c.Disabled).IsFalse()
+// 		})
+
+// 		g.It("Should match event", func() {
+// 			c := &Container{}
+// 			c.Conditions.Event.parts = []string{"push"}
+// 			FilterEvent("push")(nil, c)
+// 			g.Assert(c.Disabled).IsFalse()
+// 		})
+
+// 		g.It("Should disable when event filter doesn't match", func() {
+// 			c := &Container{}
+// 			c.Conditions.Event.parts = []string{"push", "tag"}
+// 			FilterEvent("pull_request")(nil, c)
+// 			g.Assert(c.Disabled).IsTrue()
+// 		})
+
+// 		g.It("Should match matrix", func() {
+// 			c := &Container{}
+// 			c.Conditions.Matrix = map[string]string{
+// 				"go":    "1.5",
+// 				"redis": "3.0",
+// 			}
+// 			matrix := map[string]string{
+// 				"go":    "1.5",
+// 				"redis": "3.0",
+// 				"node":  "5.0.0",
+// 			}
+// 			FilterMatrix(matrix)(nil, c)
+// 			g.Assert(c.Disabled).IsFalse()
+// 		})
+
+// 		g.It("Should disable when event filter doesn't match", func() {
+// 			c := &Container{}
+// 			c.Conditions.Matrix = map[string]string{
+// 				"go":    "1.5",
+// 				"redis": "3.0",
+// 			}
+// 			matrix := map[string]string{
+// 				"go":    "1.4.2",
+// 				"redis": "3.0",
+// 				"node":  "5.0.0",
+// 			}
+// 			FilterMatrix(matrix)(nil, c)
+// 			g.Assert(c.Disabled).IsTrue()
+// 		})
+// 	})
+// }

engine/compiler/builtin/normalize.go

@@ -0,0 +1,63 @@
+package builtin
+
+import (
+	"path/filepath"
+	"strings"
+
+	"github.com/drone/drone/engine/compiler/parse"
+)
+
+type normalizeOp struct {
+	visitor
+	namespace string
+}
+
+// NewNormalizeOp returns a transformer that normalizes the container image
+// names and plugin names to their fully qualified values.
+func NewNormalizeOp(namespace string) Visitor {
+	return &normalizeOp{
+		namespace: namespace,
+	}
+}
+
+func (v *normalizeOp) VisitContainer(node *parse.ContainerNode) error {
+	v.normalizeName(node)
+	v.normalizeImage(node)
+	switch node.NodeType {
+	case parse.NodePlugin, parse.NodeCache, parse.NodeClone:
+		v.normalizePlugin(node)
+	}
+	return nil
+}
+
+// normalize the container image to the fully qualified name.
+func (v *normalizeOp) normalizeImage(node *parse.ContainerNode) {
+	if strings.Contains(node.Container.Image, ":") {
+		return
+	}
+	node.Container.Image = node.Container.Image + ":latest"
+}
+
+// normalize the plugin entrypoint and command values.
+func (v *normalizeOp) normalizePlugin(node *parse.ContainerNode) {
+	if strings.Contains(node.Container.Image, "/") {
+		return
+	}
+	node.Container.Image = filepath.Join(v.namespace, node.Container.Image)
+}
+
+// normalize the container name to ensrue a value is set.
+func (v *normalizeOp) normalizeName(node *parse.ContainerNode) {
+	if node.Container.Name != "" {
+		return
+	}
+
+	parts := strings.Split(node.Container.Image, "/")
+	if len(parts) != 0 {
+		node.Container.Name = parts[len(parts)-1]
+	}
+	parts = strings.Split(node.Container.Image, ":")
+	if len(parts) != 0 {
+		node.Container.Name = parts[0]
+	}
+}

engine/compiler/builtin/normalize_test.go

@@ -0,0 +1,69 @@
+package builtin
+
+import (
+	"testing"
+
+	"github.com/drone/drone/engine/compiler/parse"
+	"github.com/drone/drone/engine/runner"
+
+	"github.com/franela/goblin"
+)
+
+func Test_normalize(t *testing.T) {
+	root := parse.NewRootNode()
+
+	g := goblin.Goblin(t)
+	g.Describe("normalizing", func() {
+
+		g.Describe("images", func() {
+
+			g.It("should append tag if empty", func() {
+				c := root.NewContainerNode()
+				c.Container = runner.Container{Image: "golang"}
+				op := NewNormalizeOp("")
+
+				op.VisitContainer(c)
+				g.Assert(c.Container.Image).Equal("golang:latest")
+			})
+
+			g.It("should not override existing tag", func() {
+				c := root.NewContainerNode()
+				c.Container = runner.Container{Image: "golang:1.5"}
+				op := NewNormalizeOp("")
+
+				op.VisitContainer(c)
+				g.Assert(c.Container.Image).Equal("golang:1.5")
+			})
+		})
+
+		g.Describe("plugins", func() {
+
+			g.It("should prepend namespace", func() {
+				c := root.NewPluginNode()
+				c.Container = runner.Container{Image: "git"}
+				op := NewNormalizeOp("plugins")
+
+				op.VisitContainer(c)
+				g.Assert(c.Container.Image).Equal("plugins/git:latest")
+			})
+
+			g.It("should not override existing namespace", func() {
+				c := root.NewPluginNode()
+				c.Container = runner.Container{Image: "index.docker.io/drone/git"}
+				op := NewNormalizeOp("plugins")
+
+				op.VisitContainer(c)
+				g.Assert(c.Container.Image).Equal("index.docker.io/drone/git:latest")
+			})
+
+			g.It("should ignore shell or service types", func() {
+				c := root.NewShellNode()
+				c.Container = runner.Container{Image: "golang"}
+				op := NewNormalizeOp("plugins")
+
+				op.VisitContainer(c)
+				g.Assert(c.Container.Image).Equal("golang:latest")
+			})
+		})
+	})
+}

engine/compiler/builtin/pod.go

@@ -0,0 +1,50 @@
+package builtin
+
+import (
+	"fmt"
+
+	"github.com/drone/drone/engine/compiler/parse"
+	"github.com/drone/drone/engine/runner"
+)
+
+type podOp struct {
+	visitor
+	name string
+}
+
+// NewPodOp returns a transformer that configures an ambassador container
+// providing shared networking and container volumes.
+func NewPodOp(name string) Visitor {
+	return &podOp{
+		name: name,
+	}
+}
+
+func (v *podOp) VisitContainer(node *parse.ContainerNode) error {
+	if node.Container.Network == "" {
+		parent := fmt.Sprintf("container:%s", v.name)
+		node.Container.Network = parent
+	}
+	node.Container.VolumesFrom = append(node.Container.VolumesFrom, v.name)
+	return nil
+}
+
+func (v *podOp) VisitRoot(node *parse.RootNode) error {
+	service := node.NewServiceNode()
+	service.Container = runner.Container{
+		Name:       v.name,
+		Alias:      "ambassador",
+		Image:      "busybox",
+		Entrypoint: []string{"/bin/sleep"},
+		Command:    []string{"86400"},
+		Volumes:    []string{node.Path, node.Base},
+		// Entrypoint: []string{"/bin/sh", "-c"},
+		// Volumes:    []string{node.Base},
+		// Command:    []string{
+		// 	fmt.Sprintf("mkdir -p %s; sleep 86400", node.Path),
+		// },
+	}
+
+	node.Pod = service
+	return nil
+}

engine/compiler/builtin/pull.go

@@ -0,0 +1,26 @@
+package builtin
+
+import (
+	"github.com/drone/drone/engine/compiler/parse"
+)
+
+type pullOp struct {
+	visitor
+	pull bool
+}
+
+// NewPullOp returns a transformer that configures plugins to automatically
+// pull the latest images at runtime.
+func NewPullOp(pull bool) Visitor {
+	return &pullOp{
+		pull: pull,
+	}
+}
+
+func (v *pullOp) VisitContainer(node *parse.ContainerNode) error {
+	switch node.NodeType {
+	case parse.NodePlugin, parse.NodeCache, parse.NodeClone:
+		node.Container.Pull = v.pull
+	}
+	return nil
+}

engine/compiler/builtin/pull_test.go

@@ -0,0 +1,45 @@
+package builtin
+
+import (
+	"testing"
+
+	"github.com/drone/drone/engine/compiler/parse"
+	"github.com/drone/drone/engine/runner"
+
+	"github.com/franela/goblin"
+)
+
+func Test_pull(t *testing.T) {
+	root := parse.NewRootNode()
+
+	g := goblin.Goblin(t)
+	g.Describe("pull image", func() {
+
+		g.It("should be enabled for plugins", func() {
+			c := root.NewPluginNode()
+			c.Container = runner.Container{}
+			op := NewPullOp(true)
+
+			op.VisitContainer(c)
+			g.Assert(c.Container.Pull).IsTrue()
+		})
+
+		g.It("should be disabled for plugins", func() {
+			c := root.NewPluginNode()
+			c.Container = runner.Container{}
+			op := NewPullOp(false)
+
+			op.VisitContainer(c)
+			g.Assert(c.Container.Pull).IsFalse()
+		})
+
+		g.It("should be disabled for non-plugins", func() {
+			c := root.NewShellNode()
+			c.Container = runner.Container{}
+			op := NewPullOp(true)
+
+			op.VisitContainer(c)
+			g.Assert(c.Container.Pull).IsFalse()
+		})
+	})
+}

engine/compiler/builtin/shell.go

@@ -0,0 +1,85 @@
+package builtin
+
+import (
+	"bytes"
+	"encoding/base64"
+	"fmt"
+
+	"github.com/drone/drone/engine/compiler/parse"
+)
+
+const (
+	Freebsd_amd64 = "freebsd_amd64"
+	Linux_adm64   = "linux_amd64"
+	Windows_amd64 = "windows_amd64"
+)
+
+type shellOp struct {
+	visitor
+	platform string
+}
+
+// NewShellOp returns a transformer that converts the shell node to
+// a runnable container.
+func NewShellOp(platform string) Visitor {
+	return &shellOp{
+		platform: platform,
+	}
+}
+
+func (v *shellOp) VisitContainer(node *parse.ContainerNode) error {
+	if node.NodeType != parse.NodeShell {
+		return nil
+	}
+
+	node.Container.Entrypoint = []string{
+		"/bin/sh", "-c",
+	}
+	node.Container.Command = []string{
+		"echo $CI_CMDS | base64 -d | /bin/sh -e",
+	}
+	if node.Container.Environment == nil {
+		node.Container.Environment = map[string]string{}
+	}
+	node.Container.Environment["HOME"] = "/root"
+	node.Container.Environment["SHELL"] = "/bin/sh"
+	node.Container.Environment["CI_CMDS"] = toScript(
+		node.Root().Path,
+		node.Commands,
+	)
+
+	return nil
+}
+
+func toScript(base string, commands []string) string {
+	var buf bytes.Buffer
+	for _, command := range commands {
+		buf.WriteString(fmt.Sprintf(
+			traceScript,
+			"<command>"+command+"</command>",
+			command,
+		))
+	}
+
+	script := fmt.Sprintf(
+		setupScript,
+		buf.String(),
+	)
+
+	return base64.StdEncoding.EncodeToString([]byte(script))
+}
+
+// setupScript is a helper script this is added to the build to ensure
+// a minimum set of environment variables are set correctly.
+const setupScript = `
+echo $DRONE_NETRC > $HOME/.netrc
+
+%s
+`
+
+// traceScript is a helper script that is added to the build script
+// to trace a command.
+const traceScript = `
+echo %q
+%s
+`

engine/compiler/builtin/shell_test.go

@@ -0,0 +1,44 @@
+package builtin
+
+import (
+	"testing"
+
+	"github.com/drone/drone/engine/compiler/parse"
+	"github.com/drone/drone/engine/runner"
+
+	"github.com/franela/goblin"
+)
+
+func Test_shell(t *testing.T) {
+
+	g := goblin.Goblin(t)
+	g.Describe("shell containers", func() {
+
+		g.It("should ignore plugin steps", func() {
+			root := parse.NewRootNode()
+			c := root.NewPluginNode()
+			c.Container = runner.Container{}
+			ops := NewShellOp(Linux_adm64)
+			ops.VisitContainer(c)
+
+			g.Assert(len(c.Container.Entrypoint)).Equal(0)
+			g.Assert(len(c.Container.Command)).Equal(0)
+			g.Assert(c.Container.Environment["CI_CMDS"]).Equal("")
+		})
+
+		g.It("should set entrypoint, command and environment variables", func() {
+			root := parse.NewRootNode()
+			root.Base = "/go"
+			root.Path = "/go/src/github.com/octocat/hello-world"
+
+			c := root.NewShellNode()
+			c.Commands = []string{"go build"}
+			ops := NewShellOp(Linux_adm64)
+			ops.VisitContainer(c)
+
+			g.Assert(c.Container.Entrypoint).Equal([]string{"/bin/sh", "-c"})
+			g.Assert(c.Container.Command).Equal([]string{"echo $CI_CMDS | base64 -d | /bin/sh -e"})
+			g.Assert(c.Container.Environment["CI_CMDS"] != "").IsTrue()
+		})
+	})
+}

engine/compiler/builtin/validate.go

@@ -0,0 +1,105 @@
+package builtin
+
+import (
+	"fmt"
+	"path/filepath"
+
+	"github.com/drone/drone/engine/compiler/parse"
+)
+
+type validateOp struct {
+	visitor
+	plugins []string
+	trusted bool
+}
+
+// NewValidateOp returns a linter that checks container configuration.
+func NewValidateOp(trusted bool, plugins []string) Visitor {
+	return &validateOp{
+		trusted: trusted,
+		plugins: plugins,
+	}
+}
+
+func (v *validateOp) VisitContainer(node *parse.ContainerNode) error {
+	switch node.NodeType {
+	case parse.NodePlugin, parse.NodeCache, parse.NodeClone:
+		if err := v.validatePlugins(node); err != nil {
+			return err
+		}
+	}
+	if node.NodeType == parse.NodePlugin {
+		if err := v.validatePluginConfig(node); err != nil {
+			return err
+		}
+	}
+	return v.validateConfig(node)
+}
+
+// validate the plugin image and return an error if the plugin
+// image does not match the whitelist.
+func (v *validateOp) validatePlugins(node *parse.ContainerNode) error {
+	match := false
+	for _, pattern := range v.plugins {
+		ok, err := filepath.Match(pattern, node.Container.Image)
+		if ok && err == nil {
+			match = true
+			break
+		}
+	}
+	if !match {
+		return fmt.Errorf(
+			"Plugin %s is not in the whitelist",
+			node.Container.Image,
+		)
+	}
+	return nil
+}
+
+// validate the plugin command and entrypoint and return an error
+// the user attempts to set or override these values.
+func (v *validateOp) validatePluginConfig(node *parse.ContainerNode) error {
+	if len(node.Container.Entrypoint) != 0 {
+		return fmt.Errorf("Cannot set plugin Entrypoint")
+	}
+	if len(node.Container.Command) != 0 {
+		return fmt.Errorf("Cannot set plugin Command")
+	}
+	return nil
+}
+
+// validate the container configuration and return an error if
+// restricted configurations are used.
+func (v *validateOp) validateConfig(node *parse.ContainerNode) error {
+	if v.trusted {
+		return nil
+	}
+	if node.Container.Privileged {
+		return fmt.Errorf("Insufficient privileges to use privileged mode")
+	}
+	if len(node.Container.DNS) != 0 {
+		return fmt.Errorf("Insufficient privileges to use custom dns")
+	}
+	if len(node.Container.DNSSearch) != 0 {
+		return fmt.Errorf("Insufficient privileges to use dns_search")
+	}
+	if len(node.Container.Devices) != 0 {
+		return fmt.Errorf("Insufficient privileges to use devices")
+	}
+	if len(node.Container.ExtraHosts) != 0 {
+		return fmt.Errorf("Insufficient privileges to use extra_hosts")
+	}
+	if len(node.Container.Network) != 0 {
+		return fmt.Errorf("Insufficient privileges to override the network")
+	}
+	if node.Container.OomKillDisable {
+		return fmt.Errorf("Insufficient privileges to disable oom_kill")
+	}
+	if len(node.Container.Volumes) != 0 && node.Type() != parse.NodeCache {
+		return fmt.Errorf("Insufficient privileges to use volumes")
+	}
+	if len(node.Container.VolumesFrom) != 0 {
+		return fmt.Errorf("Insufficient privileges to use volumes_from")
+	}
+	return nil
+}

engine/compiler/builtin/validate_test.go

@@ -0,0 +1,199 @@
+package builtin
+
+import (
+	"testing"
+
+	"github.com/drone/drone/engine/compiler/parse"
+	"github.com/drone/drone/engine/runner"
+
+	"github.com/franela/goblin"
+)
+
+func Test_validate(t *testing.T) {
+	root := parse.NewRootNode()
+
+	g := goblin.Goblin(t)
+	g.Describe("validating", func() {
+
+		g.Describe("privileged attributes", func() {
+
+			g.It("should not error when trusted build", func() {
+				c := root.NewContainerNode()
+				c.Container = runner.Container{}
+				ops := NewValidateOp(true, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err == nil).IsTrue("error should be nil")
+			})
+
+			g.It("should error when privleged mode", func() {
+				c := root.NewContainerNode()
+				c.Container = runner.Container{}
+				c.Container.Privileged = true
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err != nil).IsTrue("error should not be nil")
+				g.Assert(err.Error()).Equal("Insufficient privileges to use privileged mode")
+			})
+
+			g.It("should error when dns configured", func() {
+				c := root.NewContainerNode()
+				c.Container = runner.Container{}
+				c.Container.DNS = []string{"8.8.8.8"}
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err != nil).IsTrue("error should not be nil")
+				g.Assert(err.Error()).Equal("Insufficient privileges to use custom dns")
+			})
+
+			g.It("should error when dns_search configured", func() {
+				c := root.NewContainerNode()
+				c.Container = runner.Container{}
+				c.Container.DNSSearch = []string{"8.8.8.8"}
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err != nil).IsTrue("error should not be nil")
+				g.Assert(err.Error()).Equal("Insufficient privileges to use dns_search")
+			})
+
+			g.It("should error when devices configured", func() {
+				c := root.NewContainerNode()
+				c.Container = runner.Container{}
+				c.Container.Devices = []string{"/dev/foo"}
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err != nil).IsTrue("error should not be nil")
+				g.Assert(err.Error()).Equal("Insufficient privileges to use devices")
+			})
+
+			g.It("should error when extra_hosts configured", func() {
+				c := root.NewContainerNode()
+				c.Container = runner.Container{}
+				c.Container.ExtraHosts = []string{"1.2.3.4 foo.com"}
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err != nil).IsTrue("error should not be nil")
+				g.Assert(err.Error()).Equal("Insufficient privileges to use extra_hosts")
+			})
+
+			g.It("should error when network configured", func() {
+				c := root.NewContainerNode()
+				c.Container = runner.Container{}
+				c.Container.Network = "host"
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err != nil).IsTrue("error should not be nil")
+				g.Assert(err.Error()).Equal("Insufficient privileges to override the network")
+			})
+
+			g.It("should error when oom_kill_disabled configured", func() {
+				c := root.NewContainerNode()
+				c.Container = runner.Container{}
+				c.Container.OomKillDisable = true
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err != nil).IsTrue("error should not be nil")
+				g.Assert(err.Error()).Equal("Insufficient privileges to disable oom_kill")
+			})
+
+			g.It("should error when volumes configured", func() {
+				c := root.NewContainerNode()
+				c.Container = runner.Container{}
+				c.Container.Volumes = []string{"/:/tmp"}
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err != nil).IsTrue("error should not be nil")
+				g.Assert(err.Error()).Equal("Insufficient privileges to use volumes")
+			})
+
+			g.It("should error when volumes_from configured", func() {
+				c := root.NewContainerNode()
+				c.Container = runner.Container{}
+				c.Container.VolumesFrom = []string{"drone"}
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err != nil).IsTrue("error should not be nil")
+				g.Assert(err.Error()).Equal("Insufficient privileges to use volumes_from")
+			})
+		})
+
+		g.Describe("plugin configuration", func() {
+			g.It("should error when entrypoint is configured", func() {
+				c := root.NewPluginNode()
+				c.Container = runner.Container{Image: "plugins/git"}
+				c.Container.Entrypoint = []string{"/bin/sh"}
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err != nil).IsTrue("error should not be nil")
+				g.Assert(err.Error()).Equal("Cannot set plugin Entrypoint")
+			})
+
+			g.It("should error when command is configured", func() {
+				c := root.NewPluginNode()
+				c.Container = runner.Container{Image: "plugins/git"}
+				c.Container.Command = []string{"cat", "/proc/1/status"}
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err != nil).IsTrue("error should not be nil")
+				g.Assert(err.Error()).Equal("Cannot set plugin Command")
+			})
+
+			g.It("should not error when empty entrypoint, command", func() {
+				c := root.NewPluginNode()
+				c.Container = runner.Container{Image: "plugins/git"}
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err == nil).IsTrue("error should be nil")
+			})
+		})
+
+		g.Describe("plugin whitelist", func() {
+
+			g.It("should error when no match found", func() {
+				c := root.NewPluginNode()
+				c.Container = runner.Container{}
+				c.Container.Image = "custom/git"
+
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err != nil).IsTrue("error should be nil")
+				g.Assert(err.Error()).Equal("Plugin custom/git is not in the whitelist")
+			})
+
+			g.It("should not error when match found", func() {
+				c := root.NewPluginNode()
+				c.Container = runner.Container{}
+				c.Container.Image = "plugins/git"
+
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err == nil).IsTrue("error should be nil")
+			})
+
+			g.It("should ignore build images", func() {
+				c := root.NewShellNode()
+				c.Container = runner.Container{}
+				c.Container.Image = "google/golang"
+
+				ops := NewValidateOp(false, []string{"plugins/*"})
+				err := ops.VisitContainer(c)
+
+				g.Assert(err == nil).IsTrue("error should be nil")
+			})
+		})
+	})
+}

engine/compiler/builtin/visitor.go

@@ -0,0 +1,23 @@
+package builtin
+
+import "github.com/drone/drone/engine/compiler/parse"
+
+// Visitor interface for walking the Yaml file.
+type Visitor interface {
+	VisitRoot(*parse.RootNode) error
+	VisitVolume(*parse.VolumeNode) error
+	VisitNetwork(*parse.NetworkNode) error
+	VisitBuild(*parse.BuildNode) error
+	VisitContainer(*parse.ContainerNode) error
+}
+
+// visitor provides an easy default implementation of a Visitor interface with
+// stubbed methods. This can be embedded in transforms to meet the basic
+// requirements.
+type visitor struct{}
+
+func (visitor) VisitRoot(*parse.RootNode) error           { return nil }
+func (visitor) VisitVolume(*parse.VolumeNode) error       { return nil }
+func (visitor) VisitNetwork(*parse.NetworkNode) error     { return nil }
+func (visitor) VisitBuild(*parse.BuildNode) error         { return nil }
+func (visitor) VisitContainer(*parse.ContainerNode) error { return nil }

engine/compiler/builtin/workspace.go

@@ -0,0 +1,50 @@
+package builtin
+
+import (
+	"path/filepath"
+
+	"github.com/drone/drone/engine/compiler/parse"
+)
+
+type workspaceOp struct {
+	visitor
+	base string
+	path string
+}
+
+// NewWorkspaceOp returns a transformer that provides a default workspace paths,
+// including the base path (mounted as a volume) and absolute path where the
+// code is cloned.
+func NewWorkspaceOp(base, path string) Visitor {
+	return &workspaceOp{
+		base: base,
+		path: path,
+	}
+}
+
+func (v *workspaceOp) VisitRoot(node *parse.RootNode) error {
+	if node.Base == "" {
+		node.Base = v.base
+	}
+	if node.Path == "" {
+		node.Path = v.path
+	}
+	if !filepath.IsAbs(node.Path) {
+		node.Path = filepath.Join(
+			node.Base,
+			node.Path,
+		)
+	}
+	return nil
+}
+
+func (v *workspaceOp) VisitContainer(node *parse.ContainerNode) error {
+	if node.NodeType == parse.NodeService {
+		// we must not override the default working
+		// directory of service containers. All other
+		// container should launch in the workspace
+		return nil
+	}
+	node.Container.WorkingDir = node.Root().Path
+	return nil
+}

engine/compiler/builtin/workspace_test.go

@@ -0,0 +1,89 @@
+package builtin
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+	"github.com/drone/drone/engine/compiler/parse"
+)
+
+func Test_workspace(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("workspace", func() {
+
+		var defaultBase = "/go"
+		var defaultPath = "src/github.com/octocat/hello-world"
+
+		g.It("should not override user paths", func() {
+			var base = "/drone"
+			var path = "/drone/src/github.com/octocat/hello-world"
+
+			op := NewWorkspaceOp(defaultBase, defaultPath)
+			root := parse.NewRootNode()
+			root.Base = base
+			root.Path = path
+
+			op.VisitRoot(root)
+			g.Assert(root.Base).Equal(base)
+			g.Assert(root.Path).Equal(path)
+		})
+
+		g.It("should convert user paths to absolute", func() {
+			var base = "/drone"
+			var path = "src/github.com/octocat/hello-world"
+			var abs = "/drone/src/github.com/octocat/hello-world"
+
+			op := NewWorkspaceOp(defaultBase, defaultPath)
+			root := parse.NewRootNode()
+			root.Base = base
+			root.Path = path
+
+			op.VisitRoot(root)
+			g.Assert(root.Base).Equal(base)
+			g.Assert(root.Path).Equal(abs)
+		})
+
+		g.It("should set the default path", func() {
+			var base = "/go"
+			var path = "/go/src/github.com/octocat/hello-world"
+
+			op := NewWorkspaceOp(defaultBase, defaultPath)
+			root := parse.NewRootNode()
+
+			op.VisitRoot(root)
+			g.Assert(root.Base).Equal(base)
+			g.Assert(root.Path).Equal(path)
+		})
+
+		g.It("should use workspace as working_dir", func() {
+			var base = "/drone"
+			var path = "/drone/src/github.com/octocat/hello-world"
+
+			root := parse.NewRootNode()
+			root.Base = base
+			root.Path = path
+
+			c := root.NewContainerNode()
+
+			op := NewWorkspaceOp(defaultBase, defaultPath)
+			op.VisitContainer(c)
+			g.Assert(c.Container.WorkingDir).Equal(root.Path)
+		})
+
+		g.It("should not use workspace as working_dir for services", func() {
+			var base = "/drone"
+			var path = "/drone/src/github.com/octocat/hello-world"
+
+			root := parse.NewRootNode()
+			root.Base = base
+			root.Path = path
+
+			c := root.NewServiceNode()
+
+			op := NewWorkspaceOp(defaultBase, defaultPath)
+			op.VisitContainer(c)
+			g.Assert(c.Container.WorkingDir).Equal("")
+		})
+	})
+}

engine/compiler/compile.go

@@ -0,0 +1,146 @@
+package libyaml
+
+import (
+	"github.com/drone/drone/engine/runner"
+	"github.com/drone/drone/engine/runner/parse"
+
+	yaml "github.com/drone/drone/engine/compiler/parse"
+)
+
+// Compiler compiles the Yaml file to the intermediate representation.
+type Compiler struct {
+	trans []Transform
+}
+
+func New() *Compiler {
+	return &Compiler{}
+}
+
+// Transforms sets the compiler transforms use to transform the intermediate
+// representation during compilation.
+func (c *Compiler) Transforms(trans []Transform) *Compiler {
+	c.trans = append(c.trans, trans...)
+	return c
+}
+
+// CompileString compiles the Yaml configuration string and returns
+// the intermediate representation for the interpreter.
+func (c *Compiler) CompileString(in string) (*runner.Spec, error) {
+	return c.Compile([]byte(in))
+}
+
+// CompileString compiles the Yaml configuration file and returns
+// the intermediate representation for the interpreter.
+func (c *Compiler) Compile(in []byte) (*runner.Spec, error) {
+	root, err := yaml.Parse(in)
+	if err != nil {
+		return nil, err
+	}
+	if err := root.Walk(c.walk); err != nil {
+		return nil, err
+	}
+
+	config := &runner.Spec{}
+	tree := parse.NewTree()
+
+	// pod section
+	if root.Pod != nil {
+		node, ok := root.Pod.(*yaml.ContainerNode)
+		if ok {
+			config.Containers = append(config.Containers, &node.Container)
+			tree.Append(parse.NewRunNode().SetName(node.Container.Name).SetDetach(true))
+		}
+	}
+
+	// cache section
+	if root.Cache != nil {
+		node, ok := root.Cache.(*yaml.ContainerNode)
+		if ok && !node.Disabled {
+			config.Containers = append(config.Containers, &node.Container)
+			tree.Append(parse.NewRunNode().SetName(node.Container.Name))
+		}
+	}
+
+	// clone section
+	if root.Clone != nil {
+		node, ok := root.Clone.(*yaml.ContainerNode)
+		if ok && !node.Disabled {
+			config.Containers = append(config.Containers, &node.Container)
+			tree.Append(parse.NewRunNode().SetName(node.Container.Name))
+		}
+	}
+
+	// services section
+	for _, container := range root.Services {
+		node, ok := container.(*yaml.ContainerNode)
+		if !ok || node.Disabled {
+			continue
+		}
+
+		config.Containers = append(config.Containers, &node.Container)
+		tree.Append(parse.NewRunNode().SetName(node.Container.Name).SetDetach(true))
+	}
+
+	// pipeline section
+	for i, container := range root.Script {
+		node, ok := container.(*yaml.ContainerNode)
+		if !ok || node.Disabled {
+			continue
+		}
+
+		config.Containers = append(config.Containers, &node.Container)
+
+		// step 1: lookahead to see if any status=failure exist
+		list := parse.NewListNode()
+		for ii, next := range root.Script {
+			if i >= ii {
+				continue
+			}
+			node, ok := next.(*yaml.ContainerNode)
+			if !ok || node.Disabled || !node.OnFailure() {
+				continue
+			}
+
+			list.Append(
+				parse.NewRecoverNode().SetBody(
+					parse.NewRunNode().SetName(
+						node.Container.Name,
+					),
+				),
+			)
+		}
+		// step 2: if yes, collect these and append to "error" node
+		if len(list.Body) == 0 {
+			tree.Append(parse.NewRunNode().SetName(node.Container.Name))
+		} else {
+			errorNode := parse.NewErrorNode()
+			errorNode.SetBody(parse.NewRunNode().SetName(node.Container.Name))
+			errorNode.SetDefer(list)
+			tree.Append(errorNode)
+		}
+	}
+
+	config.Nodes = tree
+	return config, nil
+}
+
+func (c *Compiler) walk(node yaml.Node) (err error) {
+	for _, trans := range c.trans {
+		switch v := node.(type) {
+		case *yaml.BuildNode:
+			err = trans.VisitBuild(v)
+		case *yaml.ContainerNode:
+			err = trans.VisitContainer(v)
+		case *yaml.NetworkNode:
+			err = trans.VisitNetwork(v)
+		case *yaml.VolumeNode:
+			err = trans.VisitVolume(v)
+		case *yaml.RootNode:
+			err = trans.VisitRoot(v)
+		}
+		if err != nil {
+			break
+		}
+	}
+	return err
+}

engine/compiler/compile_test.go

@@ -0,0 +1 @@
+package libyaml

engine/compiler/parse/node.go

@@ -0,0 +1,34 @@
+package parse
+
+const (
+	NodeBuild     = "build"
+	NodeCache     = "cache"
+	NodeClone     = "clone"
+	NodeContainer = "container"
+	NodeNetwork   = "network"
+	NodePlugin    = "plugin"
+	NodeRoot      = "root"
+	NodeService   = "service"
+	NodeShell     = "shell"
+	NodeVolume    = "volume"
+)
+
+// NodeType identifies the type of parse tree node.
+type NodeType string
+
+// Type returns itself an provides an easy default implementation.
+// for embedding in a Node. Embedded in all non-trivial Nodes.
+func (t NodeType) Type() NodeType {
+	return t
+}
+
+// String returns the string value of the Node type.
+func (t NodeType) String() string {
+	return string(t)
+}
+
+// A Node is an element in the parse tree.
+type Node interface {
+	Type() NodeType
+	Root() *RootNode
+}

engine/compiler/parse/node_build.go

@@ -0,0 +1,42 @@
+package parse
+
+// BuildNode represents Docker image build instructions.
+type BuildNode struct {
+	NodeType
+
+	Context    string
+	Dockerfile string
+	Args       map[string]string
+
+	root *RootNode
+}
+
+// Root returns the root node.
+func (n *BuildNode) Root() *RootNode { return n.root }
+
+//
+// intermediate types for yaml decoding.
+//
+
+type build struct {
+	Context    string
+	Dockerfile string
+	Args       map[string]string
+}
+
+func (b *build) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	err := unmarshal(&b.Context)
+	if err == nil {
+		return nil
+	}
+	out := struct {
+		Context    string
+		Dockerfile string
+		Args       map[string]string
+	}{}
+	err = unmarshal(&out)
+	b.Context = out.Context
+	b.Args = out.Args
+	b.Dockerfile = out.Dockerfile
+	return err
+}

engine/compiler/parse/node_build_test.go

@@ -0,0 +1,38 @@
+package parse
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+	"gopkg.in/yaml.v2"
+)
+
+func TestBuildNode(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("Build", func() {
+		g.Describe("given a yaml file", func() {
+
+			g.It("should unmarshal", func() {
+				in := []byte(".")
+				out := build{}
+				err := yaml.Unmarshal(in, &out)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(out.Context).Equal(".")
+			})
+
+			g.It("should unmarshal shorthand", func() {
+				in := []byte("{ context: ., dockerfile: Dockerfile }")
+				out := build{}
+				err := yaml.Unmarshal(in, &out)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(out.Context).Equal(".")
+				g.Assert(out.Dockerfile).Equal("Dockerfile")
+			})
+		})
+	})
+}

engine/compiler/parse/node_container.go

@@ -0,0 +1,180 @@
+package parse
+
+import (
+	"fmt"
+
+	"github.com/drone/drone/engine/runner"
+
+	"gopkg.in/yaml.v2"
+)
+
+type Conditions struct {
+	Platform    []string
+	Environment []string
+	Event       []string
+	Branch      []string
+	Status      []string
+	Matrix      map[string]string
+}
+
+// ContainerNode represents a Docker container.
+type ContainerNode struct {
+	NodeType
+
+	// Container represents the container configuration.
+	Container  runner.Container
+	Conditions Conditions
+	Disabled   bool
+	Commands   []string
+	Vargs      map[string]interface{}
+
+	root *RootNode
+}
+
+// Root returns the root node.
+func (n *ContainerNode) Root() *RootNode { return n.root }
+
+// OnSuccess returns true if the container should be executed
+// when the exit code of the previous step is 0.
+func (n *ContainerNode) OnSuccess() bool {
+	for _, status := range n.Conditions.Status {
+		if status == "success" {
+			return true
+		}
+	}
+	return false
+}
+
+// OnFailure returns true if the container should be executed
+// even when the exit code of the previous step != 0.
+func (n *ContainerNode) OnFailure() bool {
+	for _, status := range n.Conditions.Status {
+		if status == "failure" {
+			return true
+		}
+	}
+	return false
+}
+
+//
+// intermediate types for yaml decoding.
+//
+
+type container struct {
+	Name           string        `yaml:"name"`
+	Image          string        `yaml:"image"`
+	Build          string        `yaml:"build"`
+	Pull           bool          `yaml:"pull"`
+	Privileged     bool          `yaml:"privileged"`
+	Environment    mapEqualSlice `yaml:"environment"`
+	Entrypoint     stringOrSlice `yaml:"entrypoint"`
+	Command        stringOrSlice `yaml:"command"`
+	Commands       stringOrSlice `yaml:"commands"`
+	ExtraHosts     stringOrSlice `yaml:"extra_hosts"`
+	Volumes        stringOrSlice `yaml:"volumes"`
+	VolumesFrom    stringOrSlice `yaml:"volumes_from"`
+	Devices        stringOrSlice `yaml:"devices"`
+	Network        string        `yaml:"network_mode"`
+	DNS            stringOrSlice `yaml:"dns"`
+	DNSSearch      stringOrSlice `yaml:"dns_search"`
+	MemSwapLimit   int64         `yaml:"memswap_limit"`
+	MemLimit       int64         `yaml:"mem_limit"`
+	CPUQuota       int64         `yaml:"cpu_quota"`
+	CPUShares      int64         `yaml:"cpu_shares"`
+	CPUSet         string        `yaml:"cpuset"`
+	OomKillDisable bool          `yaml:"oom_kill_disable"`
+
+	AuthConfig struct {
+		Username string `yaml:"username"`
+		Password string `yaml:"password"`
+		Email    string `yaml:"email"`
+		Token    string `yaml:"registry_token"`
+	} `yaml:"auth_config"`
+
+	Conditions struct {
+		Platform    stringOrSlice     `yaml:"platform"`
+		Environment stringOrSlice     `yaml:"environment"`
+		Event       stringOrSlice     `yaml:"event"`
+		Branch      stringOrSlice     `yaml:"branch"`
+		Status      stringOrSlice     `yaml:"status"`
+		Matrix      map[string]string `yaml:"matrix"`
+	} `yaml:"when"`
+
+	Vargs map[string]interface{} `yaml:",inline"`
+}
+
+func (c *container) ToContainer() runner.Container {
+	return runner.Container{
+		Name:           c.Name,
+		Image:          c.Image,
+		Pull:           c.Pull,
+		Privileged:     c.Privileged,
+		Environment:    c.Environment.parts,
+		Entrypoint:     c.Entrypoint.parts,
+		Command:        c.Command.parts,
+		ExtraHosts:     c.ExtraHosts.parts,
+		Volumes:        c.Volumes.parts,
+		VolumesFrom:    c.VolumesFrom.parts,
+		Devices:        c.Devices.parts,
+		Network:        c.Network,
+		DNS:            c.DNS.parts,
+		DNSSearch:      c.DNSSearch.parts,
+		MemSwapLimit:   c.MemSwapLimit,
+		MemLimit:       c.MemLimit,
+		CPUQuota:       c.CPUQuota,
+		CPUShares:      c.CPUShares,
+		CPUSet:         c.CPUSet,
+		OomKillDisable: c.OomKillDisable,
+		AuthConfig: runner.Auth{
+			Username: c.AuthConfig.Username,
+			Password: c.AuthConfig.Password,
+			Email:    c.AuthConfig.Email,
+			Token:    c.AuthConfig.Token,
+		},
+	}
+}
+
+func (c *container) ToConditions() Conditions {
+	return Conditions{
+		Platform:    c.Conditions.Platform.parts,
+		Environment: c.Conditions.Environment.parts,
+		Event:       c.Conditions.Event.parts,
+		Branch:      c.Conditions.Branch.parts,
+		Status:      c.Conditions.Status.parts,
+		Matrix:      c.Conditions.Matrix,
+	}
+}
+
+type containerList struct {
+	containers []*container
+}
+
+func (c *containerList) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	slice := yaml.MapSlice{}
+	err := unmarshal(&slice)
+	if err != nil {
+		return err
+	}
+
+	for _, s := range slice {
+		cc := container{}
+
+		out, err := yaml.Marshal(s.Value)
+		if err != nil {
+			return err
+		}
+
+		err = yaml.Unmarshal(out, &cc)
+		if err != nil {
+			return err
+		}
+		if cc.Name == "" {
+			cc.Name = fmt.Sprintf("%v", s.Key)
+		}
+		if cc.Image == "" {
+			cc.Image = fmt.Sprintf("%v", s.Key)
+		}
+		c.containers = append(c.containers, &cc)
+	}
+	return err
+}

engine/compiler/parse/node_container_test.go

@@ -0,0 +1,97 @@
+package parse
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+	"gopkg.in/yaml.v2"
+)
+
+func TestContainerNode(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("Containers", func() {
+		g.Describe("given a yaml file", func() {
+
+			g.It("should unmarshal", func() {
+				in := []byte(sampleContainer)
+				out := containerList{}
+				err := yaml.Unmarshal(in, &out)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(len(out.containers)).Equal(1)
+
+				c := out.containers[0]
+				g.Assert(c.Name).Equal("foo")
+				g.Assert(c.Image).Equal("golang")
+				g.Assert(c.Build).Equal(".")
+				g.Assert(c.Pull).Equal(true)
+				g.Assert(c.Privileged).Equal(true)
+				g.Assert(c.Entrypoint.parts).Equal([]string{"/bin/sh"})
+				g.Assert(c.Command.parts).Equal([]string{"yes"})
+				g.Assert(c.Commands.parts).Equal([]string{"whoami"})
+				g.Assert(c.ExtraHosts.parts).Equal([]string{"foo.com"})
+				g.Assert(c.Volumes.parts).Equal([]string{"/foo:/bar"})
+				g.Assert(c.VolumesFrom.parts).Equal([]string{"foo"})
+				g.Assert(c.Devices.parts).Equal([]string{"/dev/tty0"})
+				g.Assert(c.Network).Equal("bridge")
+				g.Assert(c.DNS.parts).Equal([]string{"8.8.8.8"})
+				g.Assert(c.MemSwapLimit).Equal(int64(1))
+				g.Assert(c.MemLimit).Equal(int64(2))
+				g.Assert(c.CPUQuota).Equal(int64(3))
+				g.Assert(c.CPUSet).Equal("1,2")
+				g.Assert(c.OomKillDisable).Equal(true)
+				g.Assert(c.AuthConfig.Username).Equal("octocat")
+				g.Assert(c.AuthConfig.Password).Equal("password")
+				g.Assert(c.AuthConfig.Email).Equal("octocat@github.com")
+				g.Assert(c.Vargs["access_key"]).Equal("970d28f4dd477bc184fbd10b376de753")
+				g.Assert(c.Vargs["secret_key"]).Equal("9c5785d3ece6a9cdefa42eb99b58986f9095ff1c")
+			})
+
+			g.It("should unmarshal named", func() {
+				in := []byte("foo: { name: bar }")
+				out := containerList{}
+				err := yaml.Unmarshal(in, &out)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(len(out.containers)).Equal(1)
+				g.Assert(out.containers[0].Name).Equal("bar")
+			})
+
+		})
+	})
+}
+
+var sampleContainer = `
+foo:
+  image: golang
+  build: .
+  pull: true
+  privileged: true
+  environment:
+    FOO: BAR
+  entrypoint: /bin/sh
+  command: "yes"
+  commands: whoami
+  extra_hosts: foo.com
+  volumes: /foo:/bar
+  volumes_from: foo
+  devices: /dev/tty0
+  network_mode: bridge
+  dns: 8.8.8.8
+  memswap_limit: 1
+  mem_limit: 2
+  cpu_quota: 3
+  cpuset: 1,2
+  oom_kill_disable: true
+
+  auth_config:
+    username: octocat
+    password: password
+    email: octocat@github.com
+
+  access_key: 970d28f4dd477bc184fbd10b376de753
+  secret_key: 9c5785d3ece6a9cdefa42eb99b58986f9095ff1c
+`

engine/compiler/parse/node_network.go

@@ -0,0 +1,68 @@
+package parse
+
+import (
+	"fmt"
+
+	"gopkg.in/yaml.v2"
+)
+
+// NetworkNode represents a Docker network.
+type NetworkNode struct {
+	NodeType
+	root *RootNode
+
+	Name       string
+	Driver     string
+	DriverOpts map[string]string
+}
+
+// Root returns the root node.
+func (n *NetworkNode) Root() *RootNode { return n.root }
+
+//
+// intermediate types for yaml decoding.
+//
+
+// network is an intermediate type used for decoding a networks in a format
+// compatible with docker-compose.yml
+type network struct {
+	Name       string
+	Driver     string
+	DriverOpts map[string]string `yaml:"driver_opts"`
+}
+
+// networkList is an intermediate type used for decoding a slice of networks
+// in a format compatible with docker-compose.yml
+type networkList struct {
+	networks []*network
+}
+
+func (n *networkList) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	slice := yaml.MapSlice{}
+	err := unmarshal(&slice)
+	if err != nil {
+		return err
+	}
+
+	for _, s := range slice {
+		nn := network{}
+
+		out, err := yaml.Marshal(s.Value)
+		if err != nil {
+			return err
+		}
+
+		err = yaml.Unmarshal(out, &nn)
+		if err != nil {
+			return err
+		}
+		if nn.Name == "" {
+			nn.Name = fmt.Sprintf("%v", s.Key)
+		}
+		if nn.Driver == "" {
+			nn.Driver = "bridge"
+		}
+		n.networks = append(n.networks, &nn)
+	}
+	return err
+}

engine/compiler/parse/node_network_test.go

@@ -0,0 +1,51 @@
+package parse
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+	"gopkg.in/yaml.v2"
+)
+
+func TestNetworkNode(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("Networks", func() {
+		g.Describe("given a yaml file", func() {
+
+			g.It("should unmarshal", func() {
+				in := []byte("foo: { driver: overlay }")
+				out := networkList{}
+				err := yaml.Unmarshal(in, &out)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(len(out.networks)).Equal(1)
+				g.Assert(out.networks[0].Name).Equal("foo")
+				g.Assert(out.networks[0].Driver).Equal("overlay")
+			})
+
+			g.It("should unmarshal named", func() {
+				in := []byte("foo: { name: bar }")
+				out := networkList{}
+				err := yaml.Unmarshal(in, &out)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(len(out.networks)).Equal(1)
+				g.Assert(out.networks[0].Name).Equal("bar")
+			})
+
+			g.It("should unmarshal and use default driver", func() {
+				in := []byte("foo: { name: bar }")
+				out := volumeList{}
+				err := yaml.Unmarshal(in, &out)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(len(out.volumes)).Equal(1)
+				g.Assert(out.volumes[0].Driver).Equal("local")
+			})
+		})
+	})
+}

engine/compiler/parse/node_root.go

@@ -0,0 +1,148 @@
+package parse
+
+// RootNode is the root node in the parsed Yaml file.
+type RootNode struct {
+	NodeType
+
+	Platform string
+	Base     string
+	Path     string
+	Image    string
+
+	Pod      Node
+	Build    Node
+	Cache    Node
+	Clone    Node
+	Script   []Node
+	Volumes  []Node
+	Networks []Node
+	Services []Node
+}
+
+// NewRootNode returns a new root node.
+func NewRootNode() *RootNode {
+	return &RootNode{
+		NodeType: NodeRoot,
+	}
+}
+
+// Root returns the root node.
+func (n *RootNode) Root() *RootNode { return n }
+
+// Returns a new Volume Node.
+func (n *RootNode) NewVolumeNode(name string) *VolumeNode {
+	return &VolumeNode{
+		NodeType: NodeVolume,
+		Name:     name,
+		root:     n,
+	}
+}
+
+// Returns a new Network Node.
+func (n *RootNode) NewNetworkNode(name string) *NetworkNode {
+	return &NetworkNode{
+		NodeType: NodeNetwork,
+		Name:     name,
+		root:     n,
+	}
+}
+
+// Returns a new Network Node.
+func (n *RootNode) NewBuildNode(context string) *BuildNode {
+	return &BuildNode{
+		NodeType: NodeBuild,
+		Context:  context,
+		root:     n,
+	}
+}
+
+// Returns a new Container Plugin Node.
+func (n *RootNode) NewPluginNode() *ContainerNode {
+	return &ContainerNode{
+		NodeType: NodePlugin,
+		root:     n,
+	}
+}
+
+// Returns a new Container Shell Node.
+func (n *RootNode) NewShellNode() *ContainerNode {
+	return &ContainerNode{
+		NodeType: NodeShell,
+		root:     n,
+	}
+}
+
+// Returns a new Container Service Node.
+func (n *RootNode) NewServiceNode() *ContainerNode {
+	return &ContainerNode{
+		NodeType: NodeService,
+		root:     n,
+	}
+}
+
+// Returns a new Container Clone Node.
+func (n *RootNode) NewCloneNode() *ContainerNode {
+	return &ContainerNode{
+		NodeType: NodeClone,
+		root:     n,
+	}
+}
+
+// Returns a new Container Cache Node.
+func (n *RootNode) NewCacheNode() *ContainerNode {
+	return &ContainerNode{
+		NodeType: NodeCache,
+		root:     n,
+	}
+}
+
+// Returns a new Container Node.
+func (n *RootNode) NewContainerNode() *ContainerNode {
+	return &ContainerNode{
+		NodeType: NodeContainer,
+		root:     n,
+	}
+}
+
+// Walk is a function that walk through all child nodes of the RootNode
+// and invokes the Walk callback function for each Node.
+func (n *RootNode) Walk(fn WalkFunc) (err error) {
+	var nodes []Node
+	nodes = append(nodes, n)
+	nodes = append(nodes, n.Build)
+	nodes = append(nodes, n.Cache)
+	nodes = append(nodes, n.Clone)
+	nodes = append(nodes, n.Script...)
+	nodes = append(nodes, n.Volumes...)
+	nodes = append(nodes, n.Networks...)
+	nodes = append(nodes, n.Services...)
+	for _, node := range nodes {
+		err = fn(node)
+		if err != nil {
+			return
+		}
+	}
+	return
+}
+
+type WalkFunc func(Node) error
+
+//
+// intermediate types for yaml decoding.
+//
+
+type root struct {
+	Workspace struct {
+		Path string
+		Base string
+	}
+	Image    string
+	Platform string
+	Volumes  volumeList
+	Networks networkList
+	Services containerList
+	Script   containerList
+	Cache    container
+	Clone    container
+	Build    build
+}

engine/compiler/parse/node_root_test.go

@@ -0,0 +1,85 @@
+package parse
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+)
+
+func TestRootNode(t *testing.T) {
+	g := goblin.Goblin(t)
+	r := &RootNode{}
+
+	g.Describe("Root Node", func() {
+
+		g.It("should return self as root", func() {
+			g.Assert(r).Equal(r.Root())
+		})
+
+		g.It("should create a Volume Node", func() {
+			n := r.NewVolumeNode("foo")
+			g.Assert(n.Root()).Equal(r)
+			g.Assert(n.Name).Equal("foo")
+			g.Assert(n.String()).Equal(NodeVolume)
+			g.Assert(n.Type()).Equal(NodeType(NodeVolume))
+		})
+
+		g.It("should create a Network Node", func() {
+			n := r.NewNetworkNode("foo")
+			g.Assert(n.Root()).Equal(r)
+			g.Assert(n.Name).Equal("foo")
+			g.Assert(n.String()).Equal(NodeNetwork)
+			g.Assert(n.Type()).Equal(NodeType(NodeNetwork))
+		})
+
+		g.It("should create a Plugin Node", func() {
+			n := r.NewPluginNode()
+			g.Assert(n.Root()).Equal(r)
+			g.Assert(n.String()).Equal(NodePlugin)
+			g.Assert(n.Type()).Equal(NodeType(NodePlugin))
+		})
+
+		g.It("should create a Shell Node", func() {
+			n := r.NewShellNode()
+			g.Assert(n.Root()).Equal(r)
+			g.Assert(n.String()).Equal(NodeShell)
+			g.Assert(n.Type()).Equal(NodeType(NodeShell))
+		})
+
+		g.It("should create a Service Node", func() {
+			n := r.NewServiceNode()
+			g.Assert(n.Root()).Equal(r)
+			g.Assert(n.String()).Equal(NodeService)
+			g.Assert(n.Type()).Equal(NodeType(NodeService))
+		})
+
+		g.It("should create a Build Node", func() {
+			n := r.NewBuildNode(".")
+			g.Assert(n.Root()).Equal(r)
+			g.Assert(n.Context).Equal(".")
+			g.Assert(n.String()).Equal(NodeBuild)
+			g.Assert(n.Type()).Equal(NodeType(NodeBuild))
+		})
+
+		g.It("should create a Cache Node", func() {
+			n := r.NewCacheNode()
+			g.Assert(n.Root()).Equal(r)
+			g.Assert(n.String()).Equal(NodeCache)
+			g.Assert(n.Type()).Equal(NodeType(NodeCache))
+		})
+
+		g.It("should create a Clone Node", func() {
+			n := r.NewCloneNode()
+			g.Assert(n.Root()).Equal(r)
+			g.Assert(n.String()).Equal(NodeClone)
+			g.Assert(n.Type()).Equal(NodeType(NodeClone))
+		})
+
+		g.It("should create a Container Node", func() {
+			n := r.NewContainerNode()
+			g.Assert(n.Root()).Equal(r)
+			g.Assert(n.String()).Equal(NodeContainer)
+			g.Assert(n.Type()).Equal(NodeType(NodeContainer))
+		})
+	})
+}

engine/compiler/parse/node_volume.go

@@ -0,0 +1,69 @@
+package parse
+
+import (
+	"fmt"
+
+	"gopkg.in/yaml.v2"
+)
+
+// VolumeNode represents a Docker volume.
+type VolumeNode struct {
+	NodeType
+	root *RootNode
+
+	Name       string
+	Driver     string
+	DriverOpts map[string]string
+	External   bool
+}
+
+// Root returns the root node.
+func (n *VolumeNode) Root() *RootNode { return n.root }
+
+//
+// intermediate types for yaml decoding.
+//
+
+// volume is an intermediate type used for decoding a volumes in a format
+// compatible with docker-compose.yml
+type volume struct {
+	Name       string
+	Driver     string
+	DriverOpts map[string]string `yaml:"driver_opts"`
+}
+
+// volumeList is an intermediate type used for decoding a slice of volumes
+// in a format compatible with docker-compose.yml
+type volumeList struct {
+	volumes []*volume
+}
+
+func (v *volumeList) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	slice := yaml.MapSlice{}
+	err := unmarshal(&slice)
+	if err != nil {
+		return err
+	}
+
+	for _, s := range slice {
+		vv := volume{}
+
+		out, err := yaml.Marshal(s.Value)
+		if err != nil {
+			return err
+		}
+
+		err = yaml.Unmarshal(out, &vv)
+		if err != nil {
+			return err
+		}
+		if vv.Name == "" {
+			vv.Name = fmt.Sprintf("%v", s.Key)
+		}
+		if vv.Driver == "" {
+			vv.Driver = "local"
+		}
+		v.volumes = append(v.volumes, &vv)
+	}
+	return err
+}

engine/compiler/parse/node_volume_test.go

@@ -0,0 +1,51 @@
+package parse
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+	"gopkg.in/yaml.v2"
+)
+
+func TestVolumeNode(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("Volumes", func() {
+		g.Describe("given a yaml file", func() {
+
+			g.It("should unmarshal", func() {
+				in := []byte("foo: { driver: blockbridge }")
+				out := volumeList{}
+				err := yaml.Unmarshal(in, &out)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(len(out.volumes)).Equal(1)
+				g.Assert(out.volumes[0].Name).Equal("foo")
+				g.Assert(out.volumes[0].Driver).Equal("blockbridge")
+			})
+
+			g.It("should unmarshal named", func() {
+				in := []byte("foo: { name: bar }")
+				out := volumeList{}
+				err := yaml.Unmarshal(in, &out)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(len(out.volumes)).Equal(1)
+				g.Assert(out.volumes[0].Name).Equal("bar")
+			})
+
+			g.It("should unmarshal and use default driver", func() {
+				in := []byte("foo: { name: bar }")
+				out := volumeList{}
+				err := yaml.Unmarshal(in, &out)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(len(out.volumes)).Equal(1)
+				g.Assert(out.volumes[0].Driver).Equal("local")
+			})
+		})
+	})
+}

engine/compiler/parse/parse.go

@@ -0,0 +1,100 @@
+package parse
+
+import (
+	"gopkg.in/yaml.v2"
+)
+
+// Parse parses a Yaml file and returns a Tree structure.
+func Parse(in []byte) (*RootNode, error) {
+	out := root{}
+	err := yaml.Unmarshal(in, &out)
+	if err != nil {
+		return nil, err
+	}
+
+	root := NewRootNode()
+	root.Platform = out.Platform
+	root.Path = out.Workspace.Path
+	root.Base = out.Workspace.Base
+	root.Image = out.Image
+
+	// append volume nodes to tree
+	for _, v := range out.Volumes.volumes {
+		vv := root.NewVolumeNode(v.Name)
+		vv.Driver = v.Driver
+		vv.DriverOpts = v.DriverOpts
+		root.Volumes = append(root.Volumes, vv)
+	}
+
+	// append network nodes to tree
+	for _, n := range out.Networks.networks {
+		nn := root.NewNetworkNode(n.Name)
+		nn.Driver = n.Driver
+		nn.DriverOpts = n.DriverOpts
+		root.Networks = append(root.Networks, nn)
+	}
+
+	// add the build section
+	if out.Build.Context != "" {
+		root.Build = &BuildNode{
+			NodeType:   NodeBuild,
+			Context:    out.Build.Context,
+			Dockerfile: out.Build.Dockerfile,
+			Args:       out.Build.Args,
+			root:       root,
+		}
+	}
+
+	// add the cache section
+	{
+		cc := root.NewCacheNode()
+		cc.Container = out.Cache.ToContainer()
+		cc.Conditions = out.Cache.ToConditions()
+		cc.Container.Name = "cache"
+		cc.Vargs = out.Cache.Vargs
+		root.Cache = cc
+	}
+
+	// add the clone section
+	{
+		cc := root.NewCloneNode()
+		cc.Conditions = out.Clone.ToConditions()
+		cc.Container = out.Clone.ToContainer()
+		cc.Container.Name = "clone"
+		cc.Vargs = out.Clone.Vargs
+		root.Clone = cc
+	}
+
+	// append services
+	for _, c := range out.Services.containers {
+		if c.Build != "" {
+			continue
+		}
+		cc := root.NewServiceNode()
+		cc.Conditions = c.ToConditions()
+		cc.Container = c.ToContainer()
+		root.Services = append(root.Services, cc)
+	}
+
+	// append scripts
+	for _, c := range out.Script.containers {
+		var cc *ContainerNode
+		if len(c.Commands.parts) == 0 {
+			cc = root.NewPluginNode()
+		} else {
+			cc = root.NewShellNode()
+		}
+		cc.Commands = c.Commands.parts
+		cc.Vargs = c.Vargs
+		cc.Container = c.ToContainer()
+		cc.Conditions = c.ToConditions()
+		root.Script = append(root.Script, cc)
+	}
+
+	return root, nil
+}
+
+// ParseString parses a Yaml string and returns a Tree structure.
+func ParseString(in string) (*RootNode, error) {
+	return Parse([]byte(in))
+}

engine/compiler/parse/parse_test.go

@@ -0,0 +1,96 @@
+package parse
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+)
+
+func TestParse(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("Parser", func() {
+		g.Describe("given a yaml file", func() {
+
+			g.It("should unmarshal a string", func() {
+				out, err := ParseString(sampleYaml)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(out.Image).Equal("hello-world")
+				g.Assert(out.Base).Equal("/go")
+				g.Assert(out.Path).Equal("src/github.com/octocat/hello-world")
+				g.Assert(out.Build.(*BuildNode).Context).Equal(".")
+				g.Assert(out.Build.(*BuildNode).Dockerfile).Equal("Dockerfile")
+				g.Assert(out.Cache.(*ContainerNode).Vargs["mount"]).Equal("node_modules")
+				g.Assert(out.Clone.(*ContainerNode).Container.Image).Equal("git")
+				g.Assert(out.Clone.(*ContainerNode).Vargs["depth"]).Equal(1)
+				g.Assert(out.Volumes[0].(*VolumeNode).Name).Equal("custom")
+				g.Assert(out.Volumes[0].(*VolumeNode).Driver).Equal("blockbridge")
+				g.Assert(out.Networks[0].(*NetworkNode).Name).Equal("custom")
+				g.Assert(out.Networks[0].(*NetworkNode).Driver).Equal("overlay")
+				g.Assert(out.Services[0].(*ContainerNode).Container.Name).Equal("database")
+				g.Assert(out.Services[0].(*ContainerNode).Container.Image).Equal("mysql")
+				g.Assert(out.Script[0].(*ContainerNode).Container.Name).Equal("test")
+				g.Assert(out.Script[0].(*ContainerNode).Container.Image).Equal("golang")
+				g.Assert(out.Script[0].(*ContainerNode).Commands).Equal([]string{"go install", "go test"})
+				g.Assert(out.Script[0].(*ContainerNode).String()).Equal(NodeShell)
+				g.Assert(out.Script[1].(*ContainerNode).Container.Name).Equal("build")
+				g.Assert(out.Script[1].(*ContainerNode).Container.Image).Equal("golang")
+				g.Assert(out.Script[1].(*ContainerNode).Commands).Equal([]string{"go build"})
+				g.Assert(out.Script[1].(*ContainerNode).String()).Equal(NodeShell)
+				g.Assert(out.Script[2].(*ContainerNode).Container.Name).Equal("notify")
+				g.Assert(out.Script[2].(*ContainerNode).Container.Image).Equal("slack")
+				g.Assert(out.Script[2].(*ContainerNode).String()).Equal(NodePlugin)
+			})
+		})
+	})
+}
+
+var sampleYaml = `
+image: hello-world
+build:
+  context: .
+  dockerfile: Dockerfile
+
+workspace:
+  path: src/github.com/octocat/hello-world
+  base: /go
+
+clone:
+  image: git
+  depth: 1
+
+cache:
+  mount: node_modules
+
+script:
+  test:
+    image: golang
+    commands:
+      - go install
+      - go test
+  build:
+    image: golang
+    commands:
+      - go build
+    when:
+      event: push
+  notify:
+    image: slack
+    channel: dev
+    when:
+      event: failure
+
+services:
+  database:
+    image: mysql
+
+networks:
+  custom:
+    driver: overlay
+
+volumes:
+  custom:
+    driver: blockbridge
+`

engine/compiler/parse/types.go

@@ -0,0 +1,55 @@
+package parse
+
+import "strings"
+
+// mapEqualSlice represents a map[string]string or a slice of
+// strings in key=value format.
+type mapEqualSlice struct {
+	parts map[string]string
+}
+
+func (s *mapEqualSlice) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	s.parts = map[string]string{}
+	err := unmarshal(&s.parts)
+	if err == nil {
+		return nil
+	}
+
+	var slice []string
+	err = unmarshal(&slice)
+	if err != nil {
+		return err
+	}
+	for _, v := range slice {
+		parts := strings.SplitN(v, "=", 2)
+		if len(parts) == 2 {
+			key := parts[0]
+			val := parts[1]
+			s.parts[key] = val
+		}
+	}
+	return nil
+}
+
+// stringOrSlice represents a string or an array of strings.
+type stringOrSlice struct {
+	parts []string
+}
+
+func (s *stringOrSlice) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var sliceType []string
+	err := unmarshal(&sliceType)
+	if err == nil {
+		s.parts = sliceType
+		return nil
+	}
+
+	var stringType string
+	err = unmarshal(&stringType)
+	if err == nil {
+		sliceType = make([]string, 0, 1)
+		s.parts = append(sliceType, string(stringType))
+		return nil
+	}
+	return err
+}

engine/compiler/parse/types_test.go

@@ -0,0 +1,75 @@
+package parse
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+	"gopkg.in/yaml.v2"
+)
+
+func TestTypes(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("Yaml types", func() {
+		g.Describe("given a yaml file", func() {
+
+			g.It("should unmarshal a string", func() {
+				in := []byte("foo")
+				out := stringOrSlice{}
+				err := yaml.Unmarshal(in, &out)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(len(out.parts)).Equal(1)
+				g.Assert(out.parts[0]).Equal("foo")
+			})
+
+			g.It("should unmarshal a string slice", func() {
+				in := []byte("[ foo ]")
+				out := stringOrSlice{}
+				err := yaml.Unmarshal(in, &out)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(len(out.parts)).Equal(1)
+				g.Assert(out.parts[0]).Equal("foo")
+			})
+
+			g.It("should throw error when invalid string slice", func() {
+				in := []byte("{ }") // string value should fail parse
+				out := stringOrSlice{}
+				err := yaml.Unmarshal(in, &out)
+				g.Assert(err != nil).IsTrue("expects error")
+			})
+
+			g.It("should unmarshal a map", func() {
+				in := []byte("foo: bar")
+				out := mapEqualSlice{}
+				err := yaml.Unmarshal(in, &out)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(len(out.parts)).Equal(1)
+				g.Assert(out.parts["foo"]).Equal("bar")
+			})
+
+			g.It("should unmarshal a map equal slice", func() {
+				in := []byte("[ foo=bar ]")
+				out := mapEqualSlice{}
+				err := yaml.Unmarshal(in, &out)
+				if err != nil {
+					g.Fail(err)
+				}
+				g.Assert(len(out.parts)).Equal(1)
+				g.Assert(out.parts["foo"]).Equal("bar")
+			})
+
+			g.It("should throw error when invalid map equal slice", func() {
+				in := []byte("foo") // string value should fail parse
+				out := mapEqualSlice{}
+				err := yaml.Unmarshal(in, &out)
+				g.Assert(err != nil).IsTrue("expects error")
+			})
+		})
+	})
+}

engine/compiler/transform.go

@@ -0,0 +1,13 @@
+package libyaml
+
+import "github.com/drone/drone/engine/compiler/parse"
+
+// Transform is used to transform nodes from the parsed Yaml file during the
+// compilation process. A Transform may be used to add, disable or alter nodes.
+type Transform interface {
+	VisitRoot(*parse.RootNode) error
+	VisitVolume(*parse.VolumeNode) error
+	VisitNetwork(*parse.NetworkNode) error
+	VisitBuild(*parse.BuildNode) error
+	VisitContainer(*parse.ContainerNode) error
+}

engine/runner/container.go

@@ -0,0 +1,72 @@
+package runner
+
+import "fmt"
+
+// Container defines the container configuration.
+type Container struct {
+	Name           string            `json:"name"`
+	Alias          string            `json:"alias"`
+	Image          string            `json:"image"`
+	Pull           bool              `json:"pull,omitempty"`
+	AuthConfig     Auth              `json:"auth_config,omitempty"`
+	Privileged     bool              `json:"privileged,omitempty"`
+	WorkingDir     string            `json:"working_dir,omitempty"`
+	Environment    map[string]string `json:"environment,omitempty"`
+	Entrypoint     []string          `json:"entrypoint,omitempty"`
+	Command        []string          `json:"command,omitempty"`
+	ExtraHosts     []string          `json:"extra_hosts,omitempty"`
+	Volumes        []string          `json:"volumes,omitempty"`
+	VolumesFrom    []string          `json:"volumes_from,omitempty"`
+	Devices        []string          `json:"devices,omitempty"`
+	Network        string            `json:"network_mode,omitempty"`
+	DNS            []string          `json:"dns,omitempty"`
+	DNSSearch      []string          `json:"dns_search,omitempty"`
+	MemSwapLimit   int64             `json:"memswap_limit,omitempty"`
+	MemLimit       int64             `json:"mem_limit,omitempty"`
+	CPUQuota       int64             `json:"cpu_quota,omitempty"`
+	CPUShares      int64             `json:"cpu_shares,omitempty"`
+	CPUSet         string            `json:"cpuset,omitempty"`
+	OomKillDisable bool              `json:"oom_kill_disable,omitempty"`
+}
+
+// Validate validates the container configuration details and returns an error
+// if the validation fails.
+func (c *Container) Validate() error {
+	switch {
+
+	case c.Name == "":
+		return fmt.Errorf("Missing container name")
+	case c.Image == "":
+		return fmt.Errorf("Missing container image")
+	default:
+		return nil
+	}
+
+}
+
+// Auth provides authentication parameters to authenticate to a remote
+// container registry for image download.
+type Auth struct {
+	Username string `json:"username,omitempty"`
+	Password string `json:"password,omitempty"`
+	Email    string `json:"email,omitempty"`
+	Token    string `json:"registry_token,omitempty"`
+}
+
+// Volume defines a container volume.
+type Volume struct {
+	Name       string            `json:"name,omitempty"`
+	Alias      string            `json:"alias,omitempty"`
+	Driver     string            `json:"driver,omitempty"`
+	DriverOpts map[string]string `json:"driver_opts,omitempty"`
+	External   bool              `json:"external,omitempty"`
+}
+
+// Network defines a container network.
+type Network struct {
+	Name       string            `json:"name,omitempty"`
+	Alias      string            `json:"alias,omitempty"`
+	Driver     string            `json:"driver,omitempty"`
+	DriverOpts map[string]string `json:"driver_opts,omitempty"`
+	External   bool              `json:"external,omitempty"`
+}

engine/runner/container_test.go

@@ -0,0 +1,40 @@
+package runner
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+)
+
+func TestContainer(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("Container validation", func() {
+
+		g.It("fails with an invalid name", func() {
+			c := Container{
+				Image: "golang:1.5",
+			}
+			err := c.Validate()
+			g.Assert(err != nil).IsTrue()
+			g.Assert(err.Error()).Equal("Missing container name")
+		})
+
+		g.It("fails with an invalid image", func() {
+			c := Container{
+				Name: "container_0",
+			}
+			err := c.Validate()
+			g.Assert(err != nil).IsTrue()
+			g.Assert(err.Error()).Equal("Missing container image")
+		})
+
+		g.It("passes with valid attributes", func() {
+			c := Container{
+				Name:  "container_0",
+				Image: "golang:1.5",
+			}
+			g.Assert(c.Validate() == nil).IsTrue()
+		})
+	})
+}

engine/runner/engine.go

@@ -0,0 +1,22 @@
+package runner
+
+//go:generate mockery -name Engine -output mock -case=underscore
+
+import "io"
+
+// Engine defines the container runtime engine.
+type Engine interface {
+	// VolumeCreate(*Volume) (string, error)
+	// VolumeRemove(string) error
+	ContainerStart(*Container) (string, error)
+	ContainerStop(string) error
+	ContainerRemove(string) error
+	ContainerWait(string) (*State, error)
+	ContainerLogs(string) (io.ReadCloser, error)
+}
+
+// State defines the state of the container.
+type State struct {
+	ExitCode  int  // container exit code
+	OOMKilled bool // container exited due to oom error
+}

engine/runner/error.go

@@ -0,0 +1,37 @@
+package runner
+
+import (
+	"errors"
+	"fmt"
+)
+
+var (
+	// ErrSkip is used as a return value when container execution should be
+	// skipped at runtime. It is not returned as an error by any function.
+	ErrSkip = errors.New("Skip")
+
+	// ErrTerm is used as a return value when the runner should terminate
+	// execution and exit. It is not returned as an error by any function.
+	ErrTerm = errors.New("Terminate")
+)
+
+// An ExitError reports an unsuccessful exit.
+type ExitError struct {
+	Name string
+	Code int
+}
+
+// Error reteurns the error message in string format.
+func (e *ExitError) Error() string {
+	return fmt.Sprintf("%s : exit code %d", e.Name, e.Code)
+}
+
+// An OomError reports the process received an OOMKill from the kernel.
+type OomError struct {
+	Name string
+}
+
+// Error reteurns the error message in string format.
+func (e *OomError) Error() string {
+	return fmt.Sprintf("%s : received oom kill", e.Name)
+}

engine/runner/error_test.go

@@ -0,0 +1,26 @@
+package runner
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+)
+
+func TestErrors(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("Error messages", func() {
+
+		g.It("should include OOM details", func() {
+			err := OomError{Name: "golang"}
+			got, want := err.Error(), "golang : received oom kill"
+			g.Assert(got).Equal(want)
+		})
+
+		g.It("should include Exit code", func() {
+			err := ExitError{Name: "golang", Code: 255}
+			got, want := err.Error(), "golang : exit code 255"
+			g.Assert(got).Equal(want)
+		})
+	})
+}

engine/runner/helper.go

@@ -0,0 +1,24 @@
+package runner
+
+import (
+	"encoding/json"
+	"io/ioutil"
+)
+
+// Parse parses a raw file containing a JSON encoded format of an intermediate
+// representation of the pipeline.
+func Parse(data []byte) (*Spec, error) {
+	v := &Spec{}
+	err := json.Unmarshal(data, v)
+	return v, err
+}
+
+// ParseFile parses a file containing a JSON encoded format of an intermediate
+// representation of the pipeline.
+func ParseFile(filename string) (*Spec, error) {
+	out, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+	return Parse(out)
+}

engine/runner/helper_test.go

@@ -0,0 +1,97 @@
+package runner
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/franela/goblin"
+)
+
+func TestHelper(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("Parsing", func() {
+
+		g.It("should unmarhsal file []byte", func() {
+			res, err := Parse(sample)
+			if err != nil {
+				t.Error(err)
+				return
+			}
+			g.Assert(err == nil).IsTrue("expect file parsed")
+			g.Assert(len(res.Containers)).Equal(2)
+			g.Assert(len(res.Volumes)).Equal(1)
+		})
+
+		g.It("should unmarshal from file", func() {
+			temp, _ := ioutil.TempFile("", "spec_")
+			defer os.Remove(temp.Name())
+
+			ioutil.WriteFile(temp.Name(), sample, 0700)
+
+			_, err := ParseFile(temp.Name())
+			if err != nil {
+				t.Error(err)
+				return
+			}
+			g.Assert(err == nil).IsTrue("expect file parsed")
+		})
+
+		g.It("should error when file not found", func() {
+			_, err := ParseFile("/tmp/foo/bar/dummy/file.json")
+			g.Assert(err == nil).IsFalse("expect file not found error")
+		})
+	})
+}
+
+// invalid json representation, simulate parsing error
+var invalid = []byte(`[]`)
+
+// valid json representation, verify parsing
+var sample = []byte(`{
+	"containers": [
+		{
+			"name": "container_0",
+			"image": "node:latest" 
+		},
+		{
+			"name": "container_1",
+			"image": "golang:latest" 
+		}
+	],
+	"volumes": [
+		{
+			"name": "volume_0"
+		}
+	],
+	"program": {
+		"type": "list",
+		"body": [
+			{
+				"type": "defer",
+				"body": {
+					"type": "recover",
+					"body": {
+						"type": "run",
+						"name": "container_0"
+					}
+				},
+				"defer": {
+					"type": "parallel",
+					"body": [
+						{
+							"type": "run",
+							"name": "container_1"
+						},
+						{
+							"type": "run",
+							"name": "container_1"
+						}
+					],
+					"limit": 2
+				}
+			}
+		]
+	}
+}`)

engine/runner/parse/node.go

@@ -0,0 +1,30 @@
+package parse
+
+const (
+	NodeList     = "list"
+	NodeDefer    = "defer"
+	NodeError    = "error"
+	NodeRecover  = "recover"
+	NodeParallel = "parallel"
+	NodeRun      = "run"
+)
+
+// NodeType identifies the type of a parse tree node.
+type NodeType string
+
+// Type returns itself and provides an easy default implementation
+// for embedding in a Node. Embedded in all non-trivial Nodes.
+func (t NodeType) Type() NodeType {
+	return t
+}
+
+// String returns the string value of the Node type.
+func (t NodeType) String() string {
+	return string(t)
+}
+
+// A Node is an element in the parse tree.
+type Node interface {
+	Type() NodeType
+	Validate() error
+}

engine/runner/parse/node_defer.go

@@ -0,0 +1,40 @@
+package parse
+
+import "fmt"
+
+// DeferNode executes the child node, and then executes the deffered node.
+// The deffered node is guaranteed to execute, even when the child node fails.
+type DeferNode struct {
+	NodeType `json:"type"`
+
+	Body  Node `json:"body"`  // evaluate node
+	Defer Node `json:"defer"` // defer evaluation of node.
+}
+
+// NewDeferNode returns a new DeferNode.
+func NewDeferNode() *DeferNode {
+	return &DeferNode{NodeType: NodeDefer}
+}
+
+func (n *DeferNode) SetBody(node Node) *DeferNode {
+	n.Body = node
+	return n
+}
+
+func (n *DeferNode) SetDefer(node Node) *DeferNode {
+	n.Defer = node
+	return n
+}
+
+func (n *DeferNode) Validate() error {
+	switch {
+	case n.NodeType != NodeDefer:
+		return fmt.Errorf("Defer Node uses an invalid type")
+	case n.Body == nil:
+		return fmt.Errorf("Defer Node body is empty")
+	case n.Defer == nil:
+		return fmt.Errorf("Defer Node defer is empty")
+	default:
+		return nil
+	}
+}

engine/runner/parse/node_defer_test.go

@@ -0,0 +1,56 @@
+package parse
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+)
+
+func TestDeferNode(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("DeferNode", func() {
+		g.It("should set body and defer node", func() {
+			node0 := NewRunNode()
+			node1 := NewRunNode()
+
+			defer0 := NewDeferNode()
+			defer1 := defer0.SetBody(node0)
+			defer2 := defer0.SetDefer(node1)
+			g.Assert(defer0.Type().String()).Equal(NodeDefer)
+			g.Assert(defer0.Body).Equal(node0)
+			g.Assert(defer0.Defer).Equal(node1)
+			g.Assert(defer0).Equal(defer1)
+			g.Assert(defer0).Equal(defer2)
+		})
+
+		g.It("should fail validation when invalid type", func() {
+			defer0 := DeferNode{}
+			err := defer0.Validate()
+			g.Assert(err == nil).IsFalse()
+			g.Assert(err.Error()).Equal("Defer Node uses an invalid type")
+		})
+
+		g.It("should fail validation when empty body", func() {
+			defer0 := NewDeferNode()
+			err := defer0.Validate()
+			g.Assert(err == nil).IsFalse()
+			g.Assert(err.Error()).Equal("Defer Node body is empty")
+		})
+
+		g.It("should fail validation when empty defer", func() {
+			defer0 := NewDeferNode()
+			defer0.SetBody(NewRunNode())
+			err := defer0.Validate()
+			g.Assert(err == nil).IsFalse()
+			g.Assert(err.Error()).Equal("Defer Node defer is empty")
+		})
+
+		g.It("should pass validation", func() {
+			defer0 := NewDeferNode()
+			defer0.SetBody(NewRunNode())
+			defer0.SetDefer(NewRunNode())
+			g.Assert(defer0.Validate() == nil).IsTrue()
+		})
+	})
+}

engine/runner/parse/node_error.go

@@ -0,0 +1,40 @@
+package parse
+
+import "fmt"
+
+// ErrorNode executes the body node, and then executes the error node if
+// the body node errors. This is similar to defer but only executes on error.
+type ErrorNode struct {
+	NodeType `json:"type"`
+
+	Body  Node `json:"body"`  // evaluate node
+	Defer Node `json:"defer"` // defer evaluation of node on error.
+}
+
+// NewErrorNode returns a new ErrorNode.
+func NewErrorNode() *ErrorNode {
+	return &ErrorNode{NodeType: NodeError}
+}
+
+func (n *ErrorNode) SetBody(node Node) *ErrorNode {
+	n.Body = node
+	return n
+}
+
+func (n *ErrorNode) SetDefer(node Node) *ErrorNode {
+	n.Defer = node
+	return n
+}
+
+func (n *ErrorNode) Validate() error {
+	switch {
+	case n.NodeType != NodeError:
+		return fmt.Errorf("Error Node uses an invalid type")
+	case n.Body == nil:
+		return fmt.Errorf("Error Node body is empty")
+	case n.Defer == nil:
+		return fmt.Errorf("Error Node defer is empty")
+	default:
+		return nil
+	}
+}

engine/runner/parse/node_error_test.go

@@ -0,0 +1,56 @@
+package parse
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+)
+
+func TestErrorNode(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("ErrorNode", func() {
+		g.It("should set body and error node", func() {
+			node0 := NewRunNode()
+			node1 := NewRunNode()
+
+			error0 := NewErrorNode()
+			error1 := error0.SetBody(node0)
+			error2 := error0.SetDefer(node1)
+			g.Assert(error0.Type().String()).Equal(NodeError)
+			g.Assert(error0.Body).Equal(node0)
+			g.Assert(error0.Defer).Equal(node1)
+			g.Assert(error0).Equal(error1)
+			g.Assert(error0).Equal(error2)
+		})
+
+		g.It("should fail validation when invalid type", func() {
+			error0 := ErrorNode{}
+			err := error0.Validate()
+			g.Assert(err == nil).IsFalse()
+			g.Assert(err.Error()).Equal("Error Node uses an invalid type")
+		})
+
+		g.It("should fail validation when empty body", func() {
+			error0 := NewErrorNode()
+			err := error0.Validate()
+			g.Assert(err == nil).IsFalse()
+			g.Assert(err.Error()).Equal("Error Node body is empty")
+		})
+
+		g.It("should fail validation when empty error", func() {
+			error0 := NewErrorNode()
+			error0.SetBody(NewRunNode())
+			err := error0.Validate()
+			g.Assert(err == nil).IsFalse()
+			g.Assert(err.Error()).Equal("Error Node defer is empty")
+		})
+
+		g.It("should pass validation", func() {
+			error0 := NewErrorNode()
+			error0.SetBody(NewRunNode())
+			error0.SetDefer(NewRunNode())
+			g.Assert(error0.Validate() == nil).IsTrue()
+		})
+	})
+}

engine/runner/parse/node_list.go

@@ -0,0 +1,33 @@
+package parse
+
+import "fmt"
+
+// ListNode serially executes a list of child nodes.
+type ListNode struct {
+	NodeType `json:"type"`
+
+	// Body is the list of child nodes
+	Body []Node `json:"body"`
+}
+
+// NewListNode returns a new ListNode.
+func NewListNode() *ListNode {
+	return &ListNode{NodeType: NodeList}
+}
+
+// Append appens a child node to the list.
+func (n *ListNode) Append(node Node) *ListNode {
+	n.Body = append(n.Body, node)
+	return n
+}
+
+func (n *ListNode) Validate() error {
+	switch {
+	case n.NodeType != NodeList:
+		return fmt.Errorf("List Node uses an invalid type")
+	case len(n.Body) == 0:
+		return fmt.Errorf("List Node body is empty")
+	default:
+		return nil
+	}
+}

engine/runner/parse/node_list_test.go

@@ -0,0 +1,44 @@
+package parse
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+)
+
+func TestListNode(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("ListNode", func() {
+		g.It("should append nodes", func() {
+			node := NewRunNode()
+
+			list0 := NewListNode()
+			list1 := list0.Append(node)
+			g.Assert(list0.Type().String()).Equal(NodeList)
+			g.Assert(list0.Body[0]).Equal(node)
+			g.Assert(list0).Equal(list1)
+		})
+
+		g.It("should fail validation when invalid type", func() {
+			list := ListNode{}
+			err := list.Validate()
+			g.Assert(err == nil).IsFalse()
+			g.Assert(err.Error()).Equal("List Node uses an invalid type")
+		})
+
+		g.It("should fail validation when empty body", func() {
+			list := NewListNode()
+			err := list.Validate()
+			g.Assert(err == nil).IsFalse()
+			g.Assert(err.Error()).Equal("List Node body is empty")
+		})
+
+		g.It("should pass validation", func() {
+			node := NewRunNode()
+			list := NewListNode()
+			list.Append(node)
+			g.Assert(list.Validate() == nil).IsTrue()
+		})
+	})
+}

engine/runner/parse/node_parallel.go

@@ -0,0 +1,36 @@
+package parse
+
+import "fmt"
+
+// ParallelNode executes a list of child nodes in parallel.
+type ParallelNode struct {
+	NodeType `json:"type"`
+
+	Body  []Node `json:"body"`  // nodes for parallel evaluation.
+	Limit int    `json:"limit"` // limit for parallel evaluation.
+}
+
+func NewParallelNode() *ParallelNode {
+	return &ParallelNode{NodeType: NodeParallel}
+}
+
+func (n *ParallelNode) Append(node Node) *ParallelNode {
+	n.Body = append(n.Body, node)
+	return n
+}
+
+func (n *ParallelNode) SetLimit(limit int) *ParallelNode {
+	n.Limit = limit
+	return n
+}
+
+func (n *ParallelNode) Validate() error {
+	switch {
+	case n.NodeType != NodeParallel:
+		return fmt.Errorf("Parallel Node uses an invalid type")
+	case len(n.Body) == 0:
+		return fmt.Errorf("Parallel Node body is empty")
+	default:
+		return nil
+	}
+}

engine/runner/parse/node_parallel_test.go

@@ -0,0 +1,42 @@
+package parse
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+)
+
+func TestParallelNode(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("ParallelNode", func() {
+		g.It("should append nodes", func() {
+			node := NewRunNode()
+
+			parallel0 := NewParallelNode()
+			parallel1 := parallel0.Append(node)
+			g.Assert(parallel0.Type().String()).Equal(NodeParallel)
+			g.Assert(parallel0.Body[0]).Equal(node)
+			g.Assert(parallel0).Equal(parallel1)
+		})
+
+		g.It("should fail validation when invalid type", func() {
+			node := ParallelNode{}
+			err := node.Validate()
+			g.Assert(err == nil).IsFalse()
+			g.Assert(err.Error()).Equal("Parallel Node uses an invalid type")
+		})
+
+		g.It("should fail validation when empty body", func() {
+			node := NewParallelNode()
+			err := node.Validate()
+			g.Assert(err == nil).IsFalse()
+			g.Assert(err.Error()).Equal("Parallel Node body is empty")
+		})
+
+		g.It("should pass validation", func() {
+			node := NewParallelNode().Append(NewRunNode())
+			g.Assert(node.Validate() == nil).IsTrue()
+		})
+	})
+}

engine/runner/parse/node_recover.go

@@ -0,0 +1,29 @@
+package parse
+
+import "fmt"
+
+type RecoverNode struct {
+	NodeType `json:"type"`
+
+	Body Node `json:"body"` // evaluate node and catch all errors.
+}
+
+func NewRecoverNode() *RecoverNode {
+	return &RecoverNode{NodeType: NodeRecover}
+}
+
+func (n *RecoverNode) SetBody(node Node) *RecoverNode {
+	n.Body = node
+	return n
+}
+
+func (n *RecoverNode) Validate() error {
+	switch {
+	case n.NodeType != NodeRecover:
+		return fmt.Errorf("Recover Node uses an invalid type")
+	case n.Body == nil:
+		return fmt.Errorf("Recover Node body is empty")
+	default:
+		return nil
+	}
+}

engine/runner/parse/node_recover_test.go

@@ -0,0 +1,43 @@
+package parse
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+)
+
+func TestRecoverNode(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("RecoverNode", func() {
+		g.It("should set body", func() {
+			node0 := NewRunNode()
+
+			recover0 := NewRecoverNode()
+			recover1 := recover0.SetBody(node0)
+			g.Assert(recover0.Type().String()).Equal(NodeRecover)
+			g.Assert(recover0.Body).Equal(node0)
+			g.Assert(recover0).Equal(recover1)
+		})
+
+		g.It("should fail validation when invalid type", func() {
+			recover0 := RecoverNode{}
+			err := recover0.Validate()
+			g.Assert(err == nil).IsFalse()
+			g.Assert(err.Error()).Equal("Recover Node uses an invalid type")
+		})
+
+		g.It("should fail validation when empty body", func() {
+			recover0 := NewRecoverNode()
+			err := recover0.Validate()
+			g.Assert(err == nil).IsFalse()
+			g.Assert(err.Error()).Equal("Recover Node body is empty")
+		})
+
+		g.It("should pass validation", func() {
+			recover0 := NewRecoverNode()
+			recover0.SetBody(NewRunNode())
+			g.Assert(recover0.Validate() == nil).IsTrue()
+		})
+	})
+}

engine/runner/parse/node_run.go

@@ -0,0 +1,41 @@
+package parse
+
+import "fmt"
+
+type RunNode struct {
+	NodeType `json:"type"`
+
+	Name   string `json:"name"`
+	Detach bool   `json:"detach,omitempty"`
+	Silent bool   `json:"silent,omitempty"`
+}
+
+func (n *RunNode) SetName(name string) *RunNode {
+	n.Name = name
+	return n
+}
+
+func (n *RunNode) SetDetach(detach bool) *RunNode {
+	n.Detach = detach
+	return n
+}
+
+func (n *RunNode) SetSilent(silent bool) *RunNode {
+	n.Silent = silent
+	return n
+}
+
+func NewRunNode() *RunNode {
+	return &RunNode{NodeType: NodeRun}
+}
+
+func (n *RunNode) Validate() error {
+	switch {
+	case n.NodeType != NodeRun:
+		return fmt.Errorf("Run Node uses an invalid type")
+	case n.Name == "":
+		return fmt.Errorf("Run Node has an invalid name")
+	default:
+		return nil
+	}
+}

engine/runner/parse/node_run_test.go

@@ -0,0 +1,41 @@
+package parse
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+)
+
+func TestRunNode(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("RunNode", func() {
+		g.It("should set container name for lookup", func() {
+			node0 := NewRunNode()
+			node1 := node0.SetName("foo")
+
+			g.Assert(node0.Type().String()).Equal(NodeRun)
+			g.Assert(node0.Name).Equal("foo")
+			g.Assert(node0).Equal(node1)
+		})
+
+		g.It("should fail validation when invalid type", func() {
+			node := RunNode{}
+			err := node.Validate()
+			g.Assert(err == nil).IsFalse()
+			g.Assert(err.Error()).Equal("Run Node uses an invalid type")
+		})
+
+		g.It("should fail validation when invalid name", func() {
+			node := NewRunNode()
+			err := node.Validate()
+			g.Assert(err == nil).IsFalse()
+			g.Assert(err.Error()).Equal("Run Node has an invalid name")
+		})
+
+		g.It("should pass validation", func() {
+			node := NewRunNode().SetName("foo")
+			g.Assert(node.Validate() == nil).IsTrue()
+		})
+	})
+}

engine/runner/parse/parse.go

@@ -0,0 +1,221 @@
+package parse
+
+import "encoding/json"
+
+// Tree is the intermediate representation of a pipeline.
+type Tree struct {
+	*ListNode // top-level Tree node
+}
+
+// New allocates a new Tree.
+func NewTree() *Tree {
+	return &Tree{
+		NewListNode(),
+	}
+}
+
+// Parse parses a JSON encoded Tree.
+func Parse(data []byte) (*Tree, error) {
+	tree := &Tree{}
+	err := tree.UnmarshalJSON(data)
+	return tree, err
+}
+
+// MarshalJSON implements the Marshaler interface and returns
+// a JSON encoded representation of the Tree.
+func (t *Tree) MarshalJSON() ([]byte, error) {
+	return json.Marshal(t.ListNode)
+}
+
+// UnmarshalJSON implements the Unmarshaler interface and returns
+// a Tree from a JSON representation.
+func (t *Tree) UnmarshalJSON(data []byte) error {
+	block, err := decodeList(data)
+	if err != nil {
+		return nil
+	}
+	t.ListNode = block.(*ListNode)
+	return nil
+}
+
+//
+// below are custom decoding functions. We cannot use the default json
+// decoder because the tree structure uses interfaces and the json decoder
+// has difficulty ascertaining the interface type when decoding.
+//
+
+func decodeNode(data []byte) (Node, error) {
+	node := &nodeType{}
+
+	err := json.Unmarshal(data, node)
+	if err != nil {
+		return nil, err
+	}
+	switch node.Type {
+	case NodeList:
+		return decodeList(data)
+	case NodeDefer:
+		return decodeDefer(data)
+	case NodeError:
+		return decodeError(data)
+	case NodeRecover:
+		return decodeRecover(data)
+	case NodeParallel:
+		return decodeParallel(data)
+	case NodeRun:
+		return decodeRun(data)
+	}
+	return nil, nil
+}
+
+func decodeNodes(data []json.RawMessage) ([]Node, error) {
+	var nodes []Node
+	for _, d := range data {
+		node, err := decodeNode(d)
+		if err != nil {
+			return nil, err
+		}
+		nodes = append(nodes, node)
+	}
+	return nodes, nil
+}
+
+func decodeList(data []byte) (Node, error) {
+	v := &nodeList{}
+	err := json.Unmarshal(data, v)
+	if err != nil {
+		return nil, err
+	}
+	b, err := decodeNodes(v.Body)
+	if err != nil {
+		return nil, err
+	}
+	n := NewListNode()
+	n.Body = b
+	return n, nil
+}
+
+func decodeDefer(data []byte) (Node, error) {
+	v := &nodeDefer{}
+	err := json.Unmarshal(data, v)
+	if err != nil {
+		return nil, err
+	}
+	b, err := decodeNode(v.Body)
+	if err != nil {
+		return nil, err
+	}
+	d, err := decodeNode(v.Defer)
+	if err != nil {
+		return nil, err
+	}
+	n := NewDeferNode()
+	n.Body = b
+	n.Defer = d
+	return n, nil
+}
+
+func decodeError(data []byte) (Node, error) {
+	v := &nodeError{}
+	err := json.Unmarshal(data, v)
+	if err != nil {
+		return nil, err
+	}
+	b, err := decodeNode(v.Body)
+	if err != nil {
+		return nil, err
+	}
+	d, err := decodeNode(v.Defer)
+	if err != nil {
+		return nil, err
+	}
+	n := NewErrorNode()
+	n.Body = b
+	n.Defer = d
+	return n, nil
+}
+
+func decodeRecover(data []byte) (Node, error) {
+	v := &nodeRecover{}
+	err := json.Unmarshal(data, v)
+	if err != nil {
+		return nil, err
+	}
+	b, err := decodeNode(v.Body)
+	if err != nil {
+		return nil, err
+	}
+	n := NewRecoverNode()
+	n.Body = b
+	return n, nil
+}
+
+func decodeParallel(data []byte) (Node, error) {
+	v := &nodeParallel{}
+	err := json.Unmarshal(data, v)
+	if err != nil {
+		return nil, err
+	}
+	b, err := decodeNodes(v.Body)
+	if err != nil {
+		return nil, err
+	}
+	n := NewParallelNode()
+	n.Body = b
+	n.Limit = v.Limit
+	return n, nil
+}
+
+func decodeRun(data []byte) (Node, error) {
+	v := &nodeRun{}
+	err := json.Unmarshal(data, v)
+	if err != nil {
+		return nil, err
+	}
+	return &RunNode{NodeRun, v.Name, v.Detach, v.Silent}, nil
+}
+
+//
+// below are intermediate representations of the node structures
+// since we cannot simply encode / decode using the built-in json
+// encoding and decoder.
+//
+
+type nodeType struct {
+	Type NodeType `json:"type"`
+}
+
+type nodeDefer struct {
+	Type  NodeType        `json:"type"`
+	Body  json.RawMessage `json:"body"`
+	Defer json.RawMessage `json:"defer"`
+}
+
+type nodeError struct {
+	Type  NodeType        `json:"type"`
+	Body  json.RawMessage `json:"body"`
+	Defer json.RawMessage `json:"defer"`
+}
+
+type nodeList struct {
+	Type NodeType          `json:"type"`
+	Body []json.RawMessage `json:"body"`
+}
+
+type nodeRecover struct {
+	Type NodeType        `json:"type"`
+	Body json.RawMessage `json:"body"`
+}
+
+type nodeParallel struct {
+	Type  NodeType          `json:"type"`
+	Body  []json.RawMessage `json:"body"`
+	Limit int               `json:"limit"`
+}
+
+type nodeRun struct {
+	Type   NodeType `json:"type"`
+	Name   string   `json:"name"`
+	Detach bool     `json:"detach,omitempty"`
+	Silent bool     `json:"silent,omitempty"`
+}

engine/runner/parse/parse_test.go

@@ -0,0 +1,80 @@
+package parse
+
+import (
+	"bytes"
+	"encoding/json"
+	"reflect"
+	"testing"
+)
+
+func TestUnmarshal(t *testing.T) {
+
+	node1 := NewRunNode().SetName("foo")
+	node2 := NewRecoverNode().SetBody(node1)
+
+	node3 := NewRunNode().SetName("bar")
+	node4 := NewRunNode().SetName("bar")
+
+	node5 := NewParallelNode().
+		Append(node3).
+		Append(node4).
+		SetLimit(2)
+
+	node6 := NewDeferNode().
+		SetBody(node2).
+		SetDefer(node5)
+
+	tree := NewTree()
+	tree.Append(node6)
+
+	encoded, err := json.MarshalIndent(tree, "", "\t")
+	if err != nil {
+		t.Error(err)
+	}
+
+	if !bytes.Equal(encoded, sample) {
+		t.Errorf("Want to marshal Tree to %s, got %s",
+			string(sample),
+			string(encoded),
+		)
+	}
+
+	parsed, err := Parse(encoded)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if !reflect.DeepEqual(tree, parsed) {
+		t.Errorf("Want to marsnal and then unmarshal Tree")
+	}
+}
+
+var sample = []byte(`{
+	"type": "list",
+	"body": [
+		{
+			"type": "defer",
+			"body": {
+				"type": "recover",
+				"body": {
+					"type": "run",
+					"name": "foo"
+				}
+			},
+			"defer": {
+				"type": "parallel",
+				"body": [
+					{
+						"type": "run",
+						"name": "bar"
+					},
+					{
+						"type": "run",
+						"name": "bar"
+					}
+				],
+				"limit": 2
+			}
+		}
+	]
+}`)

engine/runner/pipe.go

@@ -0,0 +1,49 @@
+package runner
+
+import "fmt"
+
+// Pipe returns a buffered pipe that is connected to the console output.
+type Pipe struct {
+	lines chan *Line
+	eof   chan bool
+}
+
+// Next returns the next Line of console output.
+func (p *Pipe) Next() *Line {
+	select {
+	case line := <-p.lines:
+		return line
+	case <-p.eof:
+		return nil
+	}
+}
+
+// Close closes the pipe of console output.
+func (p *Pipe) Close() {
+	go func() {
+		p.eof <- true
+	}()
+}
+
+func newPipe(buffer int) *Pipe {
+	return &Pipe{
+		lines: make(chan *Line, buffer),
+		eof:   make(chan bool),
+	}
+}
+
+// Line is a line of console output.
+type Line struct {
+	Proc string `json:"proc,omitempty"`
+	Time int64  `json:"time,omitempty"`
+	Type int    `json:"type,omitempty"`
+	Pos  int    `json:"pos,omityempty"`
+	Out  string `json:"out,omitempty"`
+}
+
+func (l *Line) String() string {
+	return fmt.Sprintf("[%s:L%v:%vs] %s", l.Proc, l.Pos, l.Time, l.Out)
+}
+
+// TODO(bradrydzewski) consider an alternate buffer impelmentation based on the
+// x.crypto ssh buffer https://github.com/golang/crypto/blob/master/ssh/buffer.go

engine/runner/pipe_test.go

@@ -0,0 +1,54 @@
+package runner
+
+import (
+	"sync"
+	"testing"
+
+	"github.com/franela/goblin"
+)
+
+func TestPipe(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("Pipe", func() {
+		g.It("should get next line from buffer", func() {
+			line := &Line{
+				Proc: "redis",
+				Pos:  1,
+				Out:  "starting redis server",
+			}
+			pipe := newPipe(10)
+			pipe.lines <- line
+			next := pipe.Next()
+			g.Assert(next).Equal(line)
+		})
+
+		g.It("should get null line on buffer closed", func() {
+			pipe := newPipe(10)
+
+			var wg sync.WaitGroup
+			wg.Add(1)
+
+			go func() {
+				next := pipe.Next()
+				g.Assert(next == nil).IsTrue("line should be nil")
+				wg.Done()
+			}()
+
+			pipe.Close()
+			wg.Wait()
+		})
+
+		g.Describe("Line output", func() {
+			g.It("should prefix string() with metadata", func() {
+				line := Line{
+					Proc: "redis",
+					Time: 60,
+					Pos:  1,
+					Out:  "starting redis server",
+				}
+				g.Assert(line.String()).Equal("[redis:L1:60s] starting redis server")
+			})
+		})
+	})
+}

engine/runner/runner.go

@@ -0,0 +1,247 @@
+package runner
+
+import (
+	"bufio"
+	"time"
+	"fmt"
+
+	"github.com/drone/drone/engine/runner/parse"
+
+	"golang.org/x/net/context"
+)
+
+// NoContext is the default context you should supply if not using your own
+// context.Context
+var NoContext = context.TODO()
+
+// Tracer defines a tracing function that is invoked prior to creating and
+// running the container.
+type Tracer func(c *Container) error
+
+// Config defines the configuration for creating the Runner.
+type Config struct {
+	Tracer Tracer
+	Engine Engine
+
+	// Buffer defines the size of the buffer for the channel to which the
+	// console output is streamed.
+	Buffer uint
+}
+
+// Runner creates a build Runner using the specific configuration for the given
+// Context and Specification.
+func (c *Config) Runner(ctx context.Context, spec *Spec) *Runner {
+
+	// TODO(bradyrdzewski) we should make a copy of the configuration parameters
+	// instead of a direct reference. This helps avoid any race conditions or
+	//unexpected behavior if the Config changes.
+	return &Runner{
+		ctx:  ctx,
+		conf: c,
+		spec: spec,
+		errc: make(chan error),
+		pipe: newPipe(int(c.Buffer) + 1),
+	}
+}
+
+type Runner struct {
+	ctx  context.Context
+	conf *Config
+	spec *Spec
+	pipe *Pipe
+	errc chan (error)
+
+	containers []string
+	volumes    []string
+	networks   []string
+}
+
+// Run starts the build runner but does not wait for it to complete. The Wait
+// method will return the exit code and release associated resources once the
+// running containers exit.
+func (r *Runner) Run() error {
+
+	go func() {
+		r.setup()
+		err := r.exec(r.spec.Nodes.ListNode)
+		r.pipe.Close()
+		r.cancel()
+		r.teardown()
+		r.errc <- err
+	}()
+
+	go func() {
+		<-r.ctx.Done()
+		r.cancel()
+	}()
+
+	return nil
+}
+
+// Wait waits for the runner to exit.
+func (r *Runner) Wait() error {
+	return <-r.errc
+}
+
+// Pipe returns a Pipe that is connected to the console output stream.
+func (r *Runner) Pipe() *Pipe {
+	return r.pipe
+}
+
+func (r *Runner) exec(node parse.Node) error {
+	switch v := node.(type) {
+	case *parse.ListNode:
+		return r.execList(v)
+	case *parse.DeferNode:
+		return r.execDefer(v)
+	case *parse.ErrorNode:
+		return r.execError(v)
+	case *parse.RecoverNode:
+		return r.execRecover(v)
+	case *parse.ParallelNode:
+		return r.execParallel(v)
+	case *parse.RunNode:
+		return r.execRun(v)
+	}
+	return fmt.Errorf("runner: unexepected node %s", node)
+}
+
+func (r *Runner) execList(node *parse.ListNode) error {
+	for _, n := range node.Body {
+		err := r.exec(n)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (r *Runner) execDefer(node *parse.DeferNode) error {
+	err1 := r.exec(node.Body)
+	err2 := r.exec(node.Defer)
+	if err1 != nil {
+		return err1
+	}
+	return err2
+}
+
+func (r *Runner) execError(node *parse.ErrorNode) error {
+	err := r.exec(node.Body)
+	if err != nil {
+		r.exec(node.Defer)
+	}
+	return err
+}
+
+func (r *Runner) execRecover(node *parse.RecoverNode) error {
+	r.exec(node.Body)
+	return nil
+}
+
+func (r *Runner) execParallel(node *parse.ParallelNode) error {
+	errc := make(chan error)
+
+	for _, n := range node.Body {
+		go func(node parse.Node) {
+			errc <- r.exec(node)
+		}(n)
+	}
+
+	var err error
+	for i := 0; i < len(node.Body); i++ {
+		select {
+		case cerr := <-errc:
+			if cerr != nil {
+				err = cerr
+			}
+		}
+	}
+
+	return err
+}
+
+func (r *Runner) execRun(node *parse.RunNode) error {
+	container, err := r.spec.lookupContainer(node.Name)
+	if err != nil {
+		return err
+	}
+	if r.conf.Tracer != nil {
+		err := r.conf.Tracer(container)
+		switch {
+		case err == ErrSkip:
+			return nil
+		case err != nil:
+			return err
+		}
+	}
+	// TODO(bradrydzewski) there is potential here for a race condition where
+	// the context is cancelled just after this line, resulting in the container
+	// still being started.
+	if r.ctx.Err() != nil {
+		return err
+	}
+
+	name, err := r.conf.Engine.ContainerStart(container)
+	if err != nil {
+		return err
+	}
+	r.containers = append(r.containers, name)
+
+	go func() {
+		if node.Silent {
+			return
+		}
+		rc, err := r.conf.Engine.ContainerLogs(name)
+		if err != nil {
+			return
+		}
+		defer rc.Close()
+
+		num := 0
+		now := time.Now().UTC()
+		scanner := bufio.NewScanner(rc)
+		for scanner.Scan() {
+			r.pipe.lines <- &Line{
+				Proc: container.Alias,
+				Time: int64(time.Since(now).Seconds()),
+				Pos:  num,
+				Out:  scanner.Text(),
+			}
+			num++
+		}
+	}()
+
+	// exit when running container in detached mode in background
+	if node.Detach {
+		return nil
+	}
+
+	state, err := r.conf.Engine.ContainerWait(name)
+	if err != nil {
+		return err
+	}
+	if state.OOMKilled {
+		return &OomError{name}
+	} else if state.ExitCode != 0 {
+		return &ExitError{name, state.ExitCode}
+	}
+	return nil
+}
+
+func (r *Runner) setup() {
+	// this is where we will setup network and volumes
+}
+
+func (r *Runner) teardown() {
+	// TODO(bradrydzewski) this is not yet thread safe.
+	for _, container := range r.containers {
+		r.conf.Engine.ContainerRemove(container)
+	}
+}
+
+func (r *Runner) cancel() {
+	// TODO(bradrydzewski) this is not yet thread safe.
+	for _, container := range r.containers {
+		r.conf.Engine.ContainerStop(container)
+	}
+}

engine/runner/runner_test.go

@@ -0,0 +1,7 @@
+package runner
+
+import "testing"
+
+func TestRunner(t *testing.T) {
+	t.Skip()
+}

engine/runner/spec.go

@@ -0,0 +1,33 @@
+package runner
+
+import (
+	"fmt"
+
+	"github.com/drone/drone/engine/runner/parse"
+)
+
+// Spec defines the pipeline configuration and exeuction.
+type Spec struct {
+	// Volumes defines a list of all container volumes.
+	Volumes []*Volume `json:"volumes,omitempty"`
+
+	// Networks defines a list of all container networks.
+	Networks []*Network `json:"networks,omitempty"`
+
+	// Containers defines a list of all containers in the pipeline.
+	Containers []*Container `json:"containers,omitempty"`
+
+	// Nodes defines the container execution tree.
+	Nodes *parse.Tree `json:"program,omitempty"`
+}
+
+// lookupContainer is a helper funciton that returns the named container from
+// the slice of containers.
+func (s *Spec) lookupContainer(name string) (*Container, error) {
+	for _, container := range s.Containers {
+		if container.Name == name {
+			return container, nil
+		}
+	}
+	return nil, fmt.Errorf("runner: unknown container %s", name)
+}

engine/runner/spec_test.go

@@ -0,0 +1,35 @@
+package runner
+
+import (
+	"testing"
+
+	"github.com/franela/goblin"
+)
+
+func TestSpec(t *testing.T) {
+	g := goblin.Goblin(t)
+
+	g.Describe("Spec file", func() {
+
+		g.Describe("when looking up a container", func() {
+
+			spec := Spec{}
+			spec.Containers = append(spec.Containers, &Container{
+				Name: "golang",
+			})
+
+			g.It("should find and return the container", func() {
+				c, err := spec.lookupContainer("golang")
+				g.Assert(err == nil).IsTrue("error should be nil")
+				g.Assert(c).Equal(spec.Containers[0])
+			})
+
+			g.It("should return an error when not found", func() {
+				c, err := spec.lookupContainer("node")
+				g.Assert(err == nil).IsFalse("should return error")
+				g.Assert(c == nil).IsTrue("should return nil container")
+			})
+
+		})
+	})
+}

vendor/github.com/cloudfoundry-incubator/candiedyaml/LICENSE

@@ -0,0 +1,176 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS

vendor/github.com/cloudfoundry-incubator/candiedyaml/README.md

@@ -0,0 +1,57 @@
+[![Build Status](https://travis-ci.org/cloudfoundry-incubator/candiedyaml.svg)](https://travis-ci.org/cloudfoundry-incubator/candiedyaml)
+
+candiedyaml
+===========
+
+YAML for Go
+
+A YAML 1.1 parser with support for YAML 1.2 features
+
+Usage
+-----
+
+```go
+package myApp
+
+import (
+  "github.com/cloudfoundry-incubator/candiedyaml"
+  "fmt"
+  "os"
+)
+
+func main() {
+  file, err := os.Open("path/to/some/file.yml")
+  if err != nil {
+    println("File does not exist:", err.Error())
+    os.Exit(1)
+  }
+  defer file.Close()
+
+  document := new(interface{})
+  decoder := candiedyaml.NewDecoder(file)
+  err = decoder.Decode(document)
+  
+  if err != nil {
+    println("Failed to decode document:", err.Error())
+  }
+  
+  println("parsed yml into interface:", fmt.Sprintf("%#v", document))
+  
+  fileToWrite, err := os.Create("path/to/some/new/file.yml")
+  if err != nil {
+    println("Failed to open file for writing:", err.Error())
+    os.Exit(1)
+  }
+  defer fileToWrite.Close()
+
+  encoder := candiedyaml.NewEncoder(fileToWrite)
+  err = encoder.Encode(document)
+
+  if err != nil {
+    println("Failed to encode document:", err.Error())
+    os.Exit(1)
+  }
+  
+  return
+}
+```

vendor/github.com/cloudfoundry-incubator/candiedyaml/api.go

@@ -0,0 +1,834 @@
+/*
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package candiedyaml
+
+import (
+	"io"
+)
+
+/*
+ * Create a new parser object.
+ */
+
+func yaml_parser_initialize(parser *yaml_parser_t) bool {
+	*parser = yaml_parser_t{
+		raw_buffer: make([]byte, 0, INPUT_RAW_BUFFER_SIZE),
+		buffer:     make([]byte, 0, INPUT_BUFFER_SIZE),
+	}
+
+	return true
+}
+
+/*
+ * Destroy a parser object.
+ */
+func yaml_parser_delete(parser *yaml_parser_t) {
+	*parser = yaml_parser_t{}
+}
+
+/*
+ * String read handler.
+ */
+
+func yaml_string_read_handler(parser *yaml_parser_t, buffer []byte) (int, error) {
+	if parser.input_pos == len(parser.input) {
+		return 0, io.EOF
+	}
+
+	n := copy(buffer, parser.input[parser.input_pos:])
+	parser.input_pos += n
+	return n, nil
+}
+
+/*
+ * File read handler.
+ */
+
+func yaml_file_read_handler(parser *yaml_parser_t, buffer []byte) (int, error) {
+	return parser.input_reader.Read(buffer)
+}
+
+/*
+ * Set a string input.
+ */
+
+func yaml_parser_set_input_string(parser *yaml_parser_t, input []byte) {
+	if parser.read_handler != nil {
+		panic("input already set")
+	}
+
+	parser.read_handler = yaml_string_read_handler
+
+	parser.input = input
+	parser.input_pos = 0
+}
+
+/*
+ * Set a reader input
+ */
+func yaml_parser_set_input_reader(parser *yaml_parser_t, reader io.Reader) {
+	if parser.read_handler != nil {
+		panic("input already set")
+	}
+
+	parser.read_handler = yaml_file_read_handler
+	parser.input_reader = reader
+}
+
+/*
+ * Set a generic input.
+ */
+
+func yaml_parser_set_input(parser *yaml_parser_t, handler yaml_read_handler_t) {
+	if parser.read_handler != nil {
+		panic("input already set")
+	}
+
+	parser.read_handler = handler
+}
+
+/*
+ * Set the source encoding.
+ */
+
+func yaml_parser_set_encoding(parser *yaml_parser_t, encoding yaml_encoding_t) {
+	if parser.encoding != yaml_ANY_ENCODING {
+		panic("encoding already set")
+	}
+
+	parser.encoding = encoding
+}
+
+/*
+ * Create a new emitter object.
+ */
+
+func yaml_emitter_initialize(emitter *yaml_emitter_t) {
+	*emitter = yaml_emitter_t{
+		buffer:     make([]byte, OUTPUT_BUFFER_SIZE),
+		raw_buffer: make([]byte, 0, OUTPUT_RAW_BUFFER_SIZE),
+		states:     make([]yaml_emitter_state_t, 0, INITIAL_STACK_SIZE),
+		events:     make([]yaml_event_t, 0, INITIAL_QUEUE_SIZE),
+	}
+}
+
+func yaml_emitter_delete(emitter *yaml_emitter_t) {
+	*emitter = yaml_emitter_t{}
+}
+
+/*
+ * String write handler.
+ */
+
+func yaml_string_write_handler(emitter *yaml_emitter_t, buffer []byte) error {
+	*emitter.output_buffer = append(*emitter.output_buffer, buffer...)
+	return nil
+}
+
+/*
+ * File write handler.
+ */
+
+func yaml_writer_write_handler(emitter *yaml_emitter_t, buffer []byte) error {
+	_, err := emitter.output_writer.Write(buffer)
+	return err
+}
+
+/*
+ * Set a string output.
+ */
+
+func yaml_emitter_set_output_string(emitter *yaml_emitter_t, buffer *[]byte) {
+	if emitter.write_handler != nil {
+		panic("output already set")
+	}
+
+	emitter.write_handler = yaml_string_write_handler
+	emitter.output_buffer = buffer
+}
+
+/*
+ * Set a file output.
+ */
+
+func yaml_emitter_set_output_writer(emitter *yaml_emitter_t, w io.Writer) {
+	if emitter.write_handler != nil {
+		panic("output already set")
+	}
+
+	emitter.write_handler = yaml_writer_write_handler
+	emitter.output_writer = w
+}
+
+/*
+ * Set a generic output handler.
+ */
+
+func yaml_emitter_set_output(emitter *yaml_emitter_t, handler yaml_write_handler_t) {
+	if emitter.write_handler != nil {
+		panic("output already set")
+	}
+
+	emitter.write_handler = handler
+}
+
+/*
+ * Set the output encoding.
+ */
+
+func yaml_emitter_set_encoding(emitter *yaml_emitter_t, encoding yaml_encoding_t) {
+	if emitter.encoding != yaml_ANY_ENCODING {
+		panic("encoding already set")
+	}
+
+	emitter.encoding = encoding
+}
+
+/*
+ * Set the canonical output style.
+ */
+
+func yaml_emitter_set_canonical(emitter *yaml_emitter_t, canonical bool) {
+	emitter.canonical = canonical
+}
+
+/*
+ * Set the indentation increment.
+ */
+
+func yaml_emitter_set_indent(emitter *yaml_emitter_t, indent int) {
+	if indent < 2 || indent > 9 {
+		indent = 2
+	}
+	emitter.best_indent = indent
+}
+
+/*
+ * Set the preferred line width.
+ */
+
+func yaml_emitter_set_width(emitter *yaml_emitter_t, width int) {
+	if width < 0 {
+		width = -1
+	}
+	emitter.best_width = width
+}
+
+/*
+ * Set if unescaped non-ASCII characters are allowed.
+ */
+
+func yaml_emitter_set_unicode(emitter *yaml_emitter_t, unicode bool) {
+	emitter.unicode = unicode
+}
+
+/*
+ * Set the preferred line break character.
+ */
+
+func yaml_emitter_set_break(emitter *yaml_emitter_t, line_break yaml_break_t) {
+	emitter.line_break = line_break
+}
+
+/*
+ * Destroy a token object.
+ */
+
+// yaml_DECLARE(void)
+// yaml_token_delete(yaml_token_t *token)
+// {
+//     assert(token);  /* Non-NULL token object expected. */
+//
+//     switch (token.type)
+//     {
+//         case yaml_TAG_DIRECTIVE_TOKEN:
+//             yaml_free(token.data.tag_directive.handle);
+//             yaml_free(token.data.tag_directive.prefix);
+//             break;
+//
+//         case yaml_ALIAS_TOKEN:
+//             yaml_free(token.data.alias.value);
+//             break;
+//
+//         case yaml_ANCHOR_TOKEN:
+//             yaml_free(token.data.anchor.value);
+//             break;
+//
+//         case yaml_TAG_TOKEN:
+//             yaml_free(token.data.tag.handle);
+//             yaml_free(token.data.tag.suffix);
+//             break;
+//
+//         case yaml_SCALAR_TOKEN:
+//             yaml_free(token.data.scalar.value);
+//             break;
+//
+//         default:
+//             break;
+//     }
+//
+//     memset(token, 0, sizeof(yaml_token_t));
+// }
+
+/*
+ * Check if a string is a valid UTF-8 sequence.
+ *
+ * Check 'reader.c' for more details on UTF-8 encoding.
+ */
+
+// static int
+// yaml_check_utf8(yaml_char_t *start, size_t length)
+// {
+//     yaml_char_t *end = start+length;
+//     yaml_char_t *pointer = start;
+//
+//     while (pointer < end) {
+//         unsigned char octet;
+//         unsigned int width;
+//         unsigned int value;
+//         size_t k;
+//
+//         octet = pointer[0];
+//         width = (octet & 0x80) == 0x00 ? 1 :
+//                 (octet & 0xE0) == 0xC0 ? 2 :
+//                 (octet & 0xF0) == 0xE0 ? 3 :
+//                 (octet & 0xF8) == 0xF0 ? 4 : 0;
+//         value = (octet & 0x80) == 0x00 ? octet & 0x7F :
+//                 (octet & 0xE0) == 0xC0 ? octet & 0x1F :
+//                 (octet & 0xF0) == 0xE0 ? octet & 0x0F :
+//                 (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0;
+//         if (!width) return 0;
+//         if (pointer+width > end) return 0;
+//         for (k = 1; k < width; k ++) {
+//             octet = pointer[k];
+//             if ((octet & 0xC0) != 0x80) return 0;
+//             value = (value << 6) + (octet & 0x3F);
+//         }
+//         if (!((width == 1) ||
+//             (width == 2 && value >= 0x80) ||
+//             (width == 3 && value >= 0x800) ||
+//             (width == 4 && value >= 0x10000))) return 0;
+//
+//         pointer += width;
+//     }
+//
+//     return 1;
+// }
+
+/*
+ * Create STREAM-START.
+ */
+
+func yaml_stream_start_event_initialize(event *yaml_event_t, encoding yaml_encoding_t) {
+	*event = yaml_event_t{
+		event_type: yaml_STREAM_START_EVENT,
+		encoding:   encoding,
+	}
+}
+
+/*
+ * Create STREAM-END.
+ */
+
+func yaml_stream_end_event_initialize(event *yaml_event_t) {
+	*event = yaml_event_t{
+		event_type: yaml_STREAM_END_EVENT,
+	}
+}
+
+/*
+ * Create DOCUMENT-START.
+ */
+
+func yaml_document_start_event_initialize(event *yaml_event_t,
+	version_directive *yaml_version_directive_t,
+	tag_directives []yaml_tag_directive_t,
+	implicit bool) {
+	*event = yaml_event_t{
+		event_type:        yaml_DOCUMENT_START_EVENT,
+		version_directive: version_directive,
+		tag_directives:    tag_directives,
+		implicit:          implicit,
+	}
+}
+
+/*
+ * Create DOCUMENT-END.
+ */
+
+func yaml_document_end_event_initialize(event *yaml_event_t, implicit bool) {
+	*event = yaml_event_t{
+		event_type: yaml_DOCUMENT_END_EVENT,
+		implicit:   implicit,
+	}
+}
+
+/*
+ * Create ALIAS.
+ */
+
+func yaml_alias_event_initialize(event *yaml_event_t, anchor []byte) {
+	*event = yaml_event_t{
+		event_type: yaml_ALIAS_EVENT,
+		anchor:     anchor,
+	}
+}
+
+/*
+ * Create SCALAR.
+ */
+
+func yaml_scalar_event_initialize(event *yaml_event_t,
+	anchor []byte, tag []byte,
+	value []byte,
+	plain_implicit bool, quoted_implicit bool,
+	style yaml_scalar_style_t) {
+
+	*event = yaml_event_t{
+		event_type:      yaml_SCALAR_EVENT,
+		anchor:          anchor,
+		tag:             tag,
+		value:           value,
+		implicit:        plain_implicit,
+		quoted_implicit: quoted_implicit,
+		style:           yaml_style_t(style),
+	}
+}
+
+/*
+ * Create SEQUENCE-START.
+ */
+
+func yaml_sequence_start_event_initialize(event *yaml_event_t,
+	anchor []byte, tag []byte, implicit bool, style yaml_sequence_style_t) {
+	*event = yaml_event_t{
+		event_type: yaml_SEQUENCE_START_EVENT,
+		anchor:     anchor,
+		tag:        tag,
+		implicit:   implicit,
+		style:      yaml_style_t(style),
+	}
+}
+
+/*
+ * Create SEQUENCE-END.
+ */
+
+func yaml_sequence_end_event_initialize(event *yaml_event_t) {
+	*event = yaml_event_t{
+		event_type: yaml_SEQUENCE_END_EVENT,
+	}
+}
+
+/*
+ * Create MAPPING-START.
+ */
+
+func yaml_mapping_start_event_initialize(event *yaml_event_t,
+	anchor []byte, tag []byte, implicit bool, style yaml_mapping_style_t) {
+	*event = yaml_event_t{
+		event_type: yaml_MAPPING_START_EVENT,
+		anchor:     anchor,
+		tag:        tag,
+		implicit:   implicit,
+		style:      yaml_style_t(style),
+	}
+}
+
+/*
+ * Create MAPPING-END.
+ */
+
+func yaml_mapping_end_event_initialize(event *yaml_event_t) {
+	*event = yaml_event_t{
+		event_type: yaml_MAPPING_END_EVENT,
+	}
+}
+
+/*
+ * Destroy an event object.
+ */
+
+func yaml_event_delete(event *yaml_event_t) {
+	*event = yaml_event_t{}
+}
+
+// /*
+//  * Create a document object.
+//  */
+//
+// func yaml_document_initialize(document *yaml_document_t,
+//          version_directive *yaml_version_directive_t,
+// 		 tag_directives []yaml_tag_directive_t,
+//          start_implicit,  end_implicit bool) bool {
+//
+//
+// {
+//     struct {
+//         YAML_error_type_t error;
+//     } context;
+//     struct {
+//         yaml_node_t *start;
+//         yaml_node_t *end;
+//         yaml_node_t *top;
+//     } nodes = { NULL, NULL, NULL };
+//     yaml_version_directive_t *version_directive_copy = NULL;
+//     struct {
+//         yaml_tag_directive_t *start;
+//         yaml_tag_directive_t *end;
+//         yaml_tag_directive_t *top;
+//     } tag_directives_copy = { NULL, NULL, NULL };
+//     yaml_tag_directive_t value = { NULL, NULL };
+//     YAML_mark_t mark = { 0, 0, 0 };
+//
+//     assert(document);       /* Non-NULL document object is expected. */
+//     assert((tag_directives_start && tag_directives_end) ||
+//             (tag_directives_start == tag_directives_end));
+//                             /* Valid tag directives are expected. */
+//
+//     if (!STACK_INIT(&context, nodes, INITIAL_STACK_SIZE)) goto error;
+//
+//     if (version_directive) {
+//         version_directive_copy = yaml_malloc(sizeof(yaml_version_directive_t));
+//         if (!version_directive_copy) goto error;
+//         version_directive_copy.major = version_directive.major;
+//         version_directive_copy.minor = version_directive.minor;
+//     }
+//
+//     if (tag_directives_start != tag_directives_end) {
+//         yaml_tag_directive_t *tag_directive;
+//         if (!STACK_INIT(&context, tag_directives_copy, INITIAL_STACK_SIZE))
+//             goto error;
+//         for (tag_directive = tag_directives_start;
+//                 tag_directive != tag_directives_end; tag_directive ++) {
+//             assert(tag_directive.handle);
+//             assert(tag_directive.prefix);
+//             if (!yaml_check_utf8(tag_directive.handle,
+//                         strlen((char *)tag_directive.handle)))
+//                 goto error;
+//             if (!yaml_check_utf8(tag_directive.prefix,
+//                         strlen((char *)tag_directive.prefix)))
+//                 goto error;
+//             value.handle = yaml_strdup(tag_directive.handle);
+//             value.prefix = yaml_strdup(tag_directive.prefix);
+//             if (!value.handle || !value.prefix) goto error;
+//             if (!PUSH(&context, tag_directives_copy, value))
+//                 goto error;
+//             value.handle = NULL;
+//             value.prefix = NULL;
+//         }
+//     }
+//
+//     DOCUMENT_INIT(*document, nodes.start, nodes.end, version_directive_copy,
+//             tag_directives_copy.start, tag_directives_copy.top,
+//             start_implicit, end_implicit, mark, mark);
+//
+//     return 1;
+//
+// error:
+//     STACK_DEL(&context, nodes);
+//     yaml_free(version_directive_copy);
+//     while (!STACK_EMPTY(&context, tag_directives_copy)) {
+//         yaml_tag_directive_t value = POP(&context, tag_directives_copy);
+//         yaml_free(value.handle);
+//         yaml_free(value.prefix);
+//     }
+//     STACK_DEL(&context, tag_directives_copy);
+//     yaml_free(value.handle);
+//     yaml_free(value.prefix);
+//
+//     return 0;
+// }
+//
+// /*
+//  * Destroy a document object.
+//  */
+//
+// yaml_DECLARE(void)
+// yaml_document_delete(document *yaml_document_t)
+// {
+//     struct {
+//         YAML_error_type_t error;
+//     } context;
+//     yaml_tag_directive_t *tag_directive;
+//
+//     context.error = yaml_NO_ERROR;  /* Eliminate a compliler warning. */
+//
+//     assert(document);   /* Non-NULL document object is expected. */
+//
+//     while (!STACK_EMPTY(&context, document.nodes)) {
+//         yaml_node_t node = POP(&context, document.nodes);
+//         yaml_free(node.tag);
+//         switch (node.type) {
+//             case yaml_SCALAR_NODE:
+//                 yaml_free(node.data.scalar.value);
+//                 break;
+//             case yaml_SEQUENCE_NODE:
+//                 STACK_DEL(&context, node.data.sequence.items);
+//                 break;
+//             case yaml_MAPPING_NODE:
+//                 STACK_DEL(&context, node.data.mapping.pairs);
+//                 break;
+//             default:
+//                 assert(0);  /* Should not happen. */
+//         }
+//     }
+//     STACK_DEL(&context, document.nodes);
+//
+//     yaml_free(document.version_directive);
+//     for (tag_directive = document.tag_directives.start;
+//             tag_directive != document.tag_directives.end;
+//             tag_directive++) {
+//         yaml_free(tag_directive.handle);
+//         yaml_free(tag_directive.prefix);
+//     }
+//     yaml_free(document.tag_directives.start);
+//
+//     memset(document, 0, sizeof(yaml_document_t));
+// }
+//
+// /**
+//  * Get a document node.
+//  */
+//
+// yaml_DECLARE(yaml_node_t *)
+// yaml_document_get_node(document *yaml_document_t, int index)
+// {
+//     assert(document);   /* Non-NULL document object is expected. */
+//
+//     if (index > 0 && document.nodes.start + index <= document.nodes.top) {
+//         return document.nodes.start + index - 1;
+//     }
+//     return NULL;
+// }
+//
+// /**
+//  * Get the root object.
+//  */
+//
+// yaml_DECLARE(yaml_node_t *)
+// yaml_document_get_root_node(document *yaml_document_t)
+// {
+//     assert(document);   /* Non-NULL document object is expected. */
+//
+//     if (document.nodes.top != document.nodes.start) {
+//         return document.nodes.start;
+//     }
+//     return NULL;
+// }
+//
+// /*
+//  * Add a scalar node to a document.
+//  */
+//
+// yaml_DECLARE(int)
+// yaml_document_add_scalar(document *yaml_document_t,
+//         yaml_char_t *tag, yaml_char_t *value, int length,
+//         yaml_scalar_style_t style)
+// {
+//     struct {
+//         YAML_error_type_t error;
+//     } context;
+//     YAML_mark_t mark = { 0, 0, 0 };
+//     yaml_char_t *tag_copy = NULL;
+//     yaml_char_t *value_copy = NULL;
+//     yaml_node_t node;
+//
+//     assert(document);   /* Non-NULL document object is expected. */
+//     assert(value);      /* Non-NULL value is expected. */
+//
+//     if (!tag) {
+//         tag = (yaml_char_t *)yaml_DEFAULT_SCALAR_TAG;
+//     }
+//
+//     if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error;
+//     tag_copy = yaml_strdup(tag);
+//     if (!tag_copy) goto error;
+//
+//     if (length < 0) {
+//         length = strlen((char *)value);
+//     }
+//
+//     if (!yaml_check_utf8(value, length)) goto error;
+//     value_copy = yaml_malloc(length+1);
+//     if (!value_copy) goto error;
+//     memcpy(value_copy, value, length);
+//     value_copy[length] = '\0';
+//
+//     SCALAR_NODE_INIT(node, tag_copy, value_copy, length, style, mark, mark);
+//     if (!PUSH(&context, document.nodes, node)) goto error;
+//
+//     return document.nodes.top - document.nodes.start;
+//
+// error:
+//     yaml_free(tag_copy);
+//     yaml_free(value_copy);
+//
+//     return 0;
+// }
+//
+// /*
+//  * Add a sequence node to a document.
+//  */
+//
+// yaml_DECLARE(int)
+// yaml_document_add_sequence(document *yaml_document_t,
+//         yaml_char_t *tag, yaml_sequence_style_t style)
+// {
+//     struct {
+//         YAML_error_type_t error;
+//     } context;
+//     YAML_mark_t mark = { 0, 0, 0 };
+//     yaml_char_t *tag_copy = NULL;
+//     struct {
+//         yaml_node_item_t *start;
+//         yaml_node_item_t *end;
+//         yaml_node_item_t *top;
+//     } items = { NULL, NULL, NULL };
+//     yaml_node_t node;
+//
+//     assert(document);   /* Non-NULL document object is expected. */
+//
+//     if (!tag) {
+//         tag = (yaml_char_t *)yaml_DEFAULT_SEQUENCE_TAG;
+//     }
+//
+//     if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error;
+//     tag_copy = yaml_strdup(tag);
+//     if (!tag_copy) goto error;
+//
+//     if (!STACK_INIT(&context, items, INITIAL_STACK_SIZE)) goto error;
+//
+//     SEQUENCE_NODE_INIT(node, tag_copy, items.start, items.end,
+//             style, mark, mark);
+//     if (!PUSH(&context, document.nodes, node)) goto error;
+//
+//     return document.nodes.top - document.nodes.start;
+//
+// error:
+//     STACK_DEL(&context, items);
+//     yaml_free(tag_copy);
+//
+//     return 0;
+// }
+//
+// /*
+//  * Add a mapping node to a document.
+//  */
+//
+// yaml_DECLARE(int)
+// yaml_document_add_mapping(document *yaml_document_t,
+//         yaml_char_t *tag, yaml_mapping_style_t style)
+// {
+//     struct {
+//         YAML_error_type_t error;
+//     } context;
+//     YAML_mark_t mark = { 0, 0, 0 };
+//     yaml_char_t *tag_copy = NULL;
+//     struct {
+//         yaml_node_pair_t *start;
+//         yaml_node_pair_t *end;
+//         yaml_node_pair_t *top;
+//     } pairs = { NULL, NULL, NULL };
+//     yaml_node_t node;
+//
+//     assert(document);   /* Non-NULL document object is expected. */
+//
+//     if (!tag) {
+//         tag = (yaml_char_t *)yaml_DEFAULT_MAPPING_TAG;
+//     }
+//
+//     if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error;
+//     tag_copy = yaml_strdup(tag);
+//     if (!tag_copy) goto error;
+//
+//     if (!STACK_INIT(&context, pairs, INITIAL_STACK_SIZE)) goto error;
+//
+//     MAPPING_NODE_INIT(node, tag_copy, pairs.start, pairs.end,
+//             style, mark, mark);
+//     if (!PUSH(&context, document.nodes, node)) goto error;
+//
+//     return document.nodes.top - document.nodes.start;
+//
+// error:
+//     STACK_DEL(&context, pairs);
+//     yaml_free(tag_copy);
+//
+//     return 0;
+// }
+//
+// /*
+//  * Append an item to a sequence node.
+//  */
+//
+// yaml_DECLARE(int)
+// yaml_document_append_sequence_item(document *yaml_document_t,
+//         int sequence, int item)
+// {
+//     struct {
+//         YAML_error_type_t error;
+//     } context;
+//
+//     assert(document);       /* Non-NULL document is required. */
+//     assert(sequence > 0
+//             && document.nodes.start + sequence <= document.nodes.top);
+//                             /* Valid sequence id is required. */
+//     assert(document.nodes.start[sequence-1].type == yaml_SEQUENCE_NODE);
+//                             /* A sequence node is required. */
+//     assert(item > 0 && document.nodes.start + item <= document.nodes.top);
+//                             /* Valid item id is required. */
+//
+//     if (!PUSH(&context,
+//                 document.nodes.start[sequence-1].data.sequence.items, item))
+//         return 0;
+//
+//     return 1;
+// }
+//
+// /*
+//  * Append a pair of a key and a value to a mapping node.
+//  */
+//
+// yaml_DECLARE(int)
+// yaml_document_append_mapping_pair(document *yaml_document_t,
+//         int mapping, int key, int value)
+// {
+//     struct {
+//         YAML_error_type_t error;
+//     } context;
+//
+//     yaml_node_pair_t pair;
+//
+//     assert(document);       /* Non-NULL document is required. */
+//     assert(mapping > 0
+//             && document.nodes.start + mapping <= document.nodes.top);
+//                             /* Valid mapping id is required. */
+//     assert(document.nodes.start[mapping-1].type == yaml_MAPPING_NODE);
+//                             /* A mapping node is required. */
+//     assert(key > 0 && document.nodes.start + key <= document.nodes.top);
+//                             /* Valid key id is required. */
+//     assert(value > 0 && document.nodes.start + value <= document.nodes.top);
+//                             /* Valid value id is required. */
+//
+//     pair.key = key;
+//     pair.value = value;
+//
+//     if (!PUSH(&context,
+//                 document.nodes.start[mapping-1].data.mapping.pairs, pair))
+//         return 0;
+//
+//     return 1;
+// }
+//

vendor/github.com/cloudfoundry-incubator/candiedyaml/decode.go

@@ -0,0 +1,622 @@
+/*
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package candiedyaml
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"reflect"
+	"runtime"
+	"strconv"
+	"strings"
+)
+
+type Unmarshaler interface {
+	UnmarshalYAML(tag string, value interface{}) error
+}
+
+// A Number represents a JSON number literal.
+type Number string
+
+// String returns the literal text of the number.
+func (n Number) String() string { return string(n) }
+
+// Float64 returns the number as a float64.
+func (n Number) Float64() (float64, error) {
+	return strconv.ParseFloat(string(n), 64)
+}
+
+// Int64 returns the number as an int64.
+func (n Number) Int64() (int64, error) {
+	return strconv.ParseInt(string(n), 10, 64)
+}
+
+type Decoder struct {
+	parser        yaml_parser_t
+	event         yaml_event_t
+	replay_events []yaml_event_t
+	useNumber     bool
+
+	anchors          map[string][]yaml_event_t
+	tracking_anchors [][]yaml_event_t
+}
+
+type ParserError struct {
+	ErrorType   YAML_error_type_t
+	Context     string
+	ContextMark YAML_mark_t
+	Problem     string
+	ProblemMark YAML_mark_t
+}
+
+func (e *ParserError) Error() string {
+	return fmt.Sprintf("yaml: [%s] %s at line %d, column %d", e.Context, e.Problem, e.ProblemMark.line+1, e.ProblemMark.column+1)
+}
+
+type UnexpectedEventError struct {
+	Value     string
+	EventType yaml_event_type_t
+	At        YAML_mark_t
+}
+
+func (e *UnexpectedEventError) Error() string {
+	return fmt.Sprintf("yaml: Unexpect event [%d]: '%s' at line %d, column %d", e.EventType, e.Value, e.At.line+1, e.At.column+1)
+}
+
+func recovery(err *error) {
+	if r := recover(); r != nil {
+		if _, ok := r.(runtime.Error); ok {
+			panic(r)
+		}
+
+		var tmpError error
+		switch r := r.(type) {
+		case error:
+			tmpError = r
+		case string:
+			tmpError = errors.New(r)
+		default:
+			tmpError = errors.New("Unknown panic: " + reflect.ValueOf(r).String())
+		}
+
+		*err = tmpError
+	}
+}
+
+func Unmarshal(data []byte, v interface{}) error {
+	d := NewDecoder(bytes.NewBuffer(data))
+	return d.Decode(v)
+}
+
+func NewDecoder(r io.Reader) *Decoder {
+	d := &Decoder{
+		anchors:          make(map[string][]yaml_event_t),
+		tracking_anchors: make([][]yaml_event_t, 1),
+	}
+	yaml_parser_initialize(&d.parser)
+	yaml_parser_set_input_reader(&d.parser, r)
+	return d
+}
+
+func (d *Decoder) Decode(v interface{}) (err error) {
+	defer recovery(&err)
+
+	rv := reflect.ValueOf(v)
+	if rv.Kind() != reflect.Ptr || rv.IsNil() {
+		return fmt.Errorf("Expected a pointer or nil but was a %s at %s", rv.String(), d.event.start_mark)
+	}
+
+	if d.event.event_type == yaml_NO_EVENT {
+		d.nextEvent()
+
+		if d.event.event_type != yaml_STREAM_START_EVENT {
+			return errors.New("Invalid stream")
+		}
+
+		d.nextEvent()
+	}
+
+	d.document(rv)
+	return nil
+}
+
+func (d *Decoder) UseNumber() { d.useNumber = true }
+
+func (d *Decoder) error(err error) {
+	panic(err)
+}
+
+func (d *Decoder) nextEvent() {
+	if d.event.event_type == yaml_STREAM_END_EVENT {
+		d.error(errors.New("The stream is closed"))
+	}
+
+	if d.replay_events != nil {
+		d.event = d.replay_events[0]
+		if len(d.replay_events) == 1 {
+			d.replay_events = nil
+		} else {
+			d.replay_events = d.replay_events[1:]
+		}
+	} else {
+		if !yaml_parser_parse(&d.parser, &d.event) {
+			yaml_event_delete(&d.event)
+
+			d.error(&ParserError{
+				ErrorType:   d.parser.error,
+				Context:     d.parser.context,
+				ContextMark: d.parser.context_mark,
+				Problem:     d.parser.problem,
+				ProblemMark: d.parser.problem_mark,
+			})
+		}
+	}
+
+	last := len(d.tracking_anchors)
+	// skip aliases when tracking an anchor
+	if last > 0 && d.event.event_type != yaml_ALIAS_EVENT {
+		d.tracking_anchors[last-1] = append(d.tracking_anchors[last-1], d.event)
+	}
+}
+
+func (d *Decoder) document(rv reflect.Value) {
+	if d.event.event_type != yaml_DOCUMENT_START_EVENT {
+		d.error(fmt.Errorf("Expected document start at %s", d.event.start_mark))
+	}
+
+	d.nextEvent()
+	d.parse(rv)
+
+	if d.event.event_type != yaml_DOCUMENT_END_EVENT {
+		d.error(fmt.Errorf("Expected document end at %s", d.event.start_mark))
+	}
+
+	d.nextEvent()
+}
+
+func (d *Decoder) parse(rv reflect.Value) {
+	if !rv.IsValid() {
+		// skip ahead since we cannot store
+		d.valueInterface()
+		return
+	}
+
+	anchor := string(d.event.anchor)
+	switch d.event.event_type {
+	case yaml_SEQUENCE_START_EVENT:
+		d.begin_anchor(anchor)
+		d.sequence(rv)
+		d.end_anchor(anchor)
+	case yaml_MAPPING_START_EVENT:
+		d.begin_anchor(anchor)
+		d.mapping(rv)
+		d.end_anchor(anchor)
+	case yaml_SCALAR_EVENT:
+		d.begin_anchor(anchor)
+		d.scalar(rv)
+		d.end_anchor(anchor)
+	case yaml_ALIAS_EVENT:
+		d.alias(rv)
+	case yaml_DOCUMENT_END_EVENT:
+	default:
+		d.error(&UnexpectedEventError{
+			Value:     string(d.event.value),
+			EventType: d.event.event_type,
+			At:        d.event.start_mark,
+		})
+	}
+}
+
+func (d *Decoder) begin_anchor(anchor string) {
+	if anchor != "" {
+		events := []yaml_event_t{d.event}
+		d.tracking_anchors = append(d.tracking_anchors, events)
+	}
+}
+
+func (d *Decoder) end_anchor(anchor string) {
+	if anchor != "" {
+		events := d.tracking_anchors[len(d.tracking_anchors)-1]
+		d.tracking_anchors = d.tracking_anchors[0 : len(d.tracking_anchors)-1]
+		// remove the anchor, replaying events shouldn't have anchors
+		events[0].anchor = nil
+		// we went one too many, remove the extra event
+		events = events[:len(events)-1]
+		// if nested, append to all the other anchors
+		for i, e := range d.tracking_anchors {
+			d.tracking_anchors[i] = append(e, events...)
+		}
+		d.anchors[anchor] = events
+	}
+}
+
+func (d *Decoder) indirect(v reflect.Value, decodingNull bool) (Unmarshaler, reflect.Value) {
+	// If v is a named type and is addressable,
+	// start with its address, so that if the type has pointer methods,
+	// we find them.
+	if v.Kind() != reflect.Ptr && v.Type().Name() != "" && v.CanAddr() {
+		v = v.Addr()
+	}
+	for {
+		// Load value from interface, but only if the result will be
+		// usefully addressable.
+		if v.Kind() == reflect.Interface && !v.IsNil() {
+			e := v.Elem()
+			if e.Kind() == reflect.Ptr && !e.IsNil() && (!decodingNull || e.Elem().Kind() == reflect.Ptr) {
+				v = e
+				continue
+			}
+		}
+
+		if v.Kind() != reflect.Ptr {
+			break
+		}
+
+		if v.Elem().Kind() != reflect.Ptr && decodingNull && v.CanSet() {
+			break
+		}
+
+		if v.IsNil() {
+			v.Set(reflect.New(v.Type().Elem()))
+		}
+
+		if v.Type().NumMethod() > 0 {
+			if u, ok := v.Interface().(Unmarshaler); ok {
+				var temp interface{}
+				return u, reflect.ValueOf(&temp)
+			}
+		}
+
+		v = v.Elem()
+	}
+
+	return nil, v
+}
+
+func (d *Decoder) sequence(v reflect.Value) {
+	if d.event.event_type != yaml_SEQUENCE_START_EVENT {
+		d.error(fmt.Errorf("Expected sequence start at %s", d.event.start_mark))
+	}
+
+	u, pv := d.indirect(v, false)
+	if u != nil {
+		defer func() {
+			if err := u.UnmarshalYAML(yaml_SEQ_TAG, pv.Interface()); err != nil {
+				d.error(err)
+			}
+		}()
+		_, pv = d.indirect(pv, false)
+	}
+
+	v = pv
+
+	// Check type of target.
+	switch v.Kind() {
+	case reflect.Interface:
+		if v.NumMethod() == 0 {
+			// Decoding into nil interface?  Switch to non-reflect code.
+			v.Set(reflect.ValueOf(d.sequenceInterface()))
+			return
+		}
+		// Otherwise it's invalid.
+		fallthrough
+	default:
+		d.error(fmt.Errorf("Expected an array, slice or interface{} but was a %s at %s", v, d.event.start_mark))
+	case reflect.Array:
+	case reflect.Slice:
+		break
+	}
+
+	d.nextEvent()
+
+	i := 0
+done:
+	for {
+		switch d.event.event_type {
+		case yaml_SEQUENCE_END_EVENT, yaml_DOCUMENT_END_EVENT:
+			break done
+		}
+
+		// Get element of array, growing if necessary.
+		if v.Kind() == reflect.Slice {
+			// Grow slice if necessary
+			if i >= v.Cap() {
+				newcap := v.Cap() + v.Cap()/2
+				if newcap < 4 {
+					newcap = 4
+				}
+				newv := reflect.MakeSlice(v.Type(), v.Len(), newcap)
+				reflect.Copy(newv, v)
+				v.Set(newv)
+			}
+			if i >= v.Len() {
+				v.SetLen(i + 1)
+			}
+		}
+
+		if i < v.Len() {
+			// Decode into element.
+			d.parse(v.Index(i))
+		} else {
+			// Ran out of fixed array: skip.
+			d.parse(reflect.Value{})
+		}
+		i++
+	}
+
+	if i < v.Len() {
+		if v.Kind() == reflect.Array {
+			// Array.  Zero the rest.
+			z := reflect.Zero(v.Type().Elem())
+			for ; i < v.Len(); i++ {
+				v.Index(i).Set(z)
+			}
+		} else {
+			v.SetLen(i)
+		}
+	}
+	if i == 0 && v.Kind() == reflect.Slice {
+		v.Set(reflect.MakeSlice(v.Type(), 0, 0))
+	}
+
+	if d.event.event_type != yaml_DOCUMENT_END_EVENT {
+		d.nextEvent()
+	}
+}
+
+func (d *Decoder) mapping(v reflect.Value) {
+	u, pv := d.indirect(v, false)
+	if u != nil {
+		defer func() {
+			if err := u.UnmarshalYAML(yaml_MAP_TAG, pv.Interface()); err != nil {
+				d.error(err)
+			}
+		}()
+		_, pv = d.indirect(pv, false)
+	}
+	v = pv
+
+	// Decoding into nil interface?  Switch to non-reflect code.
+	if v.Kind() == reflect.Interface && v.NumMethod() == 0 {
+		v.Set(reflect.ValueOf(d.mappingInterface()))
+		return
+	}
+
+	// Check type of target: struct or map[X]Y
+	switch v.Kind() {
+	case reflect.Struct:
+		d.mappingStruct(v)
+		return
+	case reflect.Map:
+	default:
+		d.error(fmt.Errorf("Expected a struct or map but was a %s at %s ", v, d.event.start_mark))
+	}
+
+	mapt := v.Type()
+	if v.IsNil() {
+		v.Set(reflect.MakeMap(mapt))
+	}
+
+	d.nextEvent()
+
+	keyt := mapt.Key()
+	mapElemt := mapt.Elem()
+
+	var mapElem reflect.Value
+done:
+	for {
+		switch d.event.event_type {
+		case yaml_MAPPING_END_EVENT:
+			break done
+		case yaml_DOCUMENT_END_EVENT:
+			return
+		}
+
+		key := reflect.New(keyt)
+		d.parse(key.Elem())
+
+		if !mapElem.IsValid() {
+			mapElem = reflect.New(mapElemt).Elem()
+		} else {
+			mapElem.Set(reflect.Zero(mapElemt))
+		}
+
+		d.parse(mapElem)
+
+		v.SetMapIndex(key.Elem(), mapElem)
+	}
+
+	d.nextEvent()
+}
+
+func (d *Decoder) mappingStruct(v reflect.Value) {
+
+	structt := v.Type()
+	fields := cachedTypeFields(structt)
+
+	d.nextEvent()
+
+done:
+	for {
+		switch d.event.event_type {
+		case yaml_MAPPING_END_EVENT:
+			break done
+		case yaml_DOCUMENT_END_EVENT:
+			return
+		}
+
+		key := ""
+		d.parse(reflect.ValueOf(&key))
+
+		// Figure out field corresponding to key.
+		var subv reflect.Value
+
+		var f *field
+		for i := range fields {
+			ff := &fields[i]
+			if ff.name == key {
+				f = ff
+				break
+			}
+
+			if f == nil && strings.EqualFold(ff.name, key) {
+				f = ff
+			}
+		}
+
+		if f != nil {
+			subv = v
+			for _, i := range f.index {
+				if subv.Kind() == reflect.Ptr {
+					if subv.IsNil() {
+						subv.Set(reflect.New(subv.Type().Elem()))
+					}
+					subv = subv.Elem()
+				}
+				subv = subv.Field(i)
+			}
+		}
+		d.parse(subv)
+	}
+
+	d.nextEvent()
+}
+
+func (d *Decoder) scalar(v reflect.Value) {
+	val := string(d.event.value)
+	wantptr := null_values[val]
+
+	u, pv := d.indirect(v, wantptr)
+
+	var tag string
+	if u != nil {
+		defer func() {
+			if err := u.UnmarshalYAML(tag, pv.Interface()); err != nil {
+				d.error(err)
+			}
+		}()
+
+		_, pv = d.indirect(pv, wantptr)
+	}
+	v = pv
+
+	var err error
+	tag, err = resolve(d.event, v, d.useNumber)
+	if err != nil {
+		d.error(err)
+	}
+
+	d.nextEvent()
+}
+
+func (d *Decoder) alias(rv reflect.Value) {
+	val, ok := d.anchors[string(d.event.anchor)]
+	if !ok {
+		d.error(fmt.Errorf("missing anchor: '%s' at %s", d.event.anchor, d.event.start_mark))
+	}
+
+	d.replay_events = val
+	d.nextEvent()
+	d.parse(rv)
+}
+
+func (d *Decoder) valueInterface() interface{} {
+	var v interface{}
+
+	anchor := string(d.event.anchor)
+	switch d.event.event_type {
+	case yaml_SEQUENCE_START_EVENT:
+		d.begin_anchor(anchor)
+		v = d.sequenceInterface()
+	case yaml_MAPPING_START_EVENT:
+		d.begin_anchor(anchor)
+		v = d.mappingInterface()
+	case yaml_SCALAR_EVENT:
+		d.begin_anchor(anchor)
+		v = d.scalarInterface()
+	case yaml_ALIAS_EVENT:
+		rv := reflect.ValueOf(&v)
+		d.alias(rv)
+		return v
+	case yaml_DOCUMENT_END_EVENT:
+		d.error(&UnexpectedEventError{
+			Value:     string(d.event.value),
+			EventType: d.event.event_type,
+			At:        d.event.start_mark,
+		})
+
+	}
+	d.end_anchor(anchor)
+
+	return v
+}
+
+func (d *Decoder) scalarInterface() interface{} {
+	_, v := resolveInterface(d.event, d.useNumber)
+
+	d.nextEvent()
+	return v
+}
+
+// sequenceInterface is like sequence but returns []interface{}.
+func (d *Decoder) sequenceInterface() []interface{} {
+	var v = make([]interface{}, 0)
+
+	d.nextEvent()
+
+done:
+	for {
+		switch d.event.event_type {
+		case yaml_SEQUENCE_END_EVENT, yaml_DOCUMENT_END_EVENT:
+			break done
+		}
+
+		v = append(v, d.valueInterface())
+	}
+
+	if d.event.event_type != yaml_DOCUMENT_END_EVENT {
+		d.nextEvent()
+	}
+
+	return v
+}
+
+// mappingInterface is like mapping but returns map[interface{}]interface{}.
+func (d *Decoder) mappingInterface() map[interface{}]interface{} {
+	m := make(map[interface{}]interface{})
+
+	d.nextEvent()
+
+done:
+	for {
+		switch d.event.event_type {
+		case yaml_MAPPING_END_EVENT, yaml_DOCUMENT_END_EVENT:
+			break done
+		}
+
+		key := d.valueInterface()
+
+		// Read value.
+		m[key] = d.valueInterface()
+	}
+
+	if d.event.event_type != yaml_DOCUMENT_END_EVENT {
+		d.nextEvent()
+	}
+
+	return m
+}

vendor/github.com/cloudfoundry-incubator/candiedyaml/encode.go

@@ -0,0 +1,395 @@
+/*
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package candiedyaml
+
+import (
+	"bytes"
+	"encoding/base64"
+	"io"
+	"math"
+	"reflect"
+	"regexp"
+	"sort"
+	"strconv"
+	"time"
+)
+
+var (
+	timeTimeType  = reflect.TypeOf(time.Time{})
+	marshalerType = reflect.TypeOf(new(Marshaler)).Elem()
+	numberType    = reflect.TypeOf(Number(""))
+	nonPrintable  = regexp.MustCompile("[^\t\n\r\u0020-\u007E\u0085\u00A0-\uD7FF\uE000-\uFFFD]")
+	multiline     = regexp.MustCompile("\n|\u0085|\u2028|\u2029")
+
+	shortTags = map[string]string{
+		yaml_NULL_TAG:      "!!null",
+		yaml_BOOL_TAG:      "!!bool",
+		yaml_STR_TAG:       "!!str",
+		yaml_INT_TAG:       "!!int",
+		yaml_FLOAT_TAG:     "!!float",
+		yaml_TIMESTAMP_TAG: "!!timestamp",
+		yaml_SEQ_TAG:       "!!seq",
+		yaml_MAP_TAG:       "!!map",
+		yaml_BINARY_TAG:    "!!binary",
+	}
+)
+
+type Marshaler interface {
+	MarshalYAML() (tag string, value interface{}, err error)
+}
+
+// An Encoder writes JSON objects to an output stream.
+type Encoder struct {
+	w       io.Writer
+	emitter yaml_emitter_t
+	event   yaml_event_t
+	flow    bool
+	err     error
+}
+
+func Marshal(v interface{}) ([]byte, error) {
+	b := bytes.Buffer{}
+	e := NewEncoder(&b)
+	err := e.Encode(v)
+	return b.Bytes(), err
+}
+
+// NewEncoder returns a new encoder that writes to w.
+func NewEncoder(w io.Writer) *Encoder {
+	e := &Encoder{w: w}
+	yaml_emitter_initialize(&e.emitter)
+	yaml_emitter_set_output_writer(&e.emitter, e.w)
+	yaml_stream_start_event_initialize(&e.event, yaml_UTF8_ENCODING)
+	e.emit()
+	yaml_document_start_event_initialize(&e.event, nil, nil, true)
+	e.emit()
+
+	return e
+}
+
+func (e *Encoder) Encode(v interface{}) (err error) {
+	defer recovery(&err)
+
+	if e.err != nil {
+		return e.err
+	}
+
+	e.marshal("", reflect.ValueOf(v), true)
+
+	yaml_document_end_event_initialize(&e.event, true)
+	e.emit()
+	e.emitter.open_ended = false
+	yaml_stream_end_event_initialize(&e.event)
+	e.emit()
+
+	return nil
+}
+
+func (e *Encoder) emit() {
+	if !yaml_emitter_emit(&e.emitter, &e.event) {
+		panic("bad emit")
+	}
+}
+
+func (e *Encoder) marshal(tag string, v reflect.Value, allowAddr bool) {
+	vt := v.Type()
+
+	if vt.Implements(marshalerType) {
+		e.emitMarshaler(tag, v)
+		return
+	}
+
+	if vt.Kind() != reflect.Ptr && allowAddr {
+		if reflect.PtrTo(vt).Implements(marshalerType) {
+			e.emitAddrMarshaler(tag, v)
+			return
+		}
+	}
+
+	switch v.Kind() {
+	case reflect.Interface:
+		if v.IsNil() {
+			e.emitNil()
+		} else {
+			e.marshal(tag, v.Elem(), allowAddr)
+		}
+	case reflect.Map:
+		e.emitMap(tag, v)
+	case reflect.Ptr:
+		if v.IsNil() {
+			e.emitNil()
+		} else {
+			e.marshal(tag, v.Elem(), true)
+		}
+	case reflect.Struct:
+		e.emitStruct(tag, v)
+	case reflect.Slice:
+		e.emitSlice(tag, v)
+	case reflect.String:
+		e.emitString(tag, v)
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		e.emitInt(tag, v)
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+		e.emitUint(tag, v)
+	case reflect.Float32, reflect.Float64:
+		e.emitFloat(tag, v)
+	case reflect.Bool:
+		e.emitBool(tag, v)
+	default:
+		panic("Can't marshal type yet: " + v.Type().String())
+	}
+}
+
+func (e *Encoder) emitMap(tag string, v reflect.Value) {
+	e.mapping(tag, func() {
+		var keys stringValues = v.MapKeys()
+		sort.Sort(keys)
+		for _, k := range keys {
+			e.marshal("", k, true)
+			e.marshal("", v.MapIndex(k), true)
+		}
+	})
+}
+
+func (e *Encoder) emitStruct(tag string, v reflect.Value) {
+	if v.Type() == timeTimeType {
+		e.emitTime(tag, v)
+		return
+	}
+
+	fields := cachedTypeFields(v.Type())
+
+	e.mapping(tag, func() {
+		for _, f := range fields {
+			fv := fieldByIndex(v, f.index)
+			if !fv.IsValid() || f.omitEmpty && isEmptyValue(fv) {
+				continue
+			}
+
+			e.marshal("", reflect.ValueOf(f.name), true)
+			e.flow = f.flow
+			e.marshal("", fv, true)
+		}
+	})
+}
+
+func (e *Encoder) emitTime(tag string, v reflect.Value) {
+	t := v.Interface().(time.Time)
+	bytes, _ := t.MarshalText()
+	e.emitScalar(string(bytes), "", tag, yaml_PLAIN_SCALAR_STYLE)
+}
+
+func isEmptyValue(v reflect.Value) bool {
+	switch v.Kind() {
+	case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
+		return v.Len() == 0
+	case reflect.Bool:
+		return !v.Bool()
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return v.Int() == 0
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+		return v.Uint() == 0
+	case reflect.Float32, reflect.Float64:
+		return v.Float() == 0
+	case reflect.Interface, reflect.Ptr:
+		return v.IsNil()
+	}
+	return false
+}
+
+func (e *Encoder) mapping(tag string, f func()) {
+	implicit := tag == ""
+	style := yaml_BLOCK_MAPPING_STYLE
+	if e.flow {
+		e.flow = false
+		style = yaml_FLOW_MAPPING_STYLE
+	}
+	yaml_mapping_start_event_initialize(&e.event, nil, []byte(tag), implicit, style)
+	e.emit()
+
+	f()
+
+	yaml_mapping_end_event_initialize(&e.event)
+	e.emit()
+}
+
+func (e *Encoder) emitSlice(tag string, v reflect.Value) {
+	if v.Type() == byteSliceType {
+		e.emitBase64(tag, v)
+		return
+	}
+
+	implicit := tag == ""
+	style := yaml_BLOCK_SEQUENCE_STYLE
+	if e.flow {
+		e.flow = false
+		style = yaml_FLOW_SEQUENCE_STYLE
+	}
+	yaml_sequence_start_event_initialize(&e.event, nil, []byte(tag), implicit, style)
+	e.emit()
+
+	n := v.Len()
+	for i := 0; i < n; i++ {
+		e.marshal("", v.Index(i), true)
+	}
+
+	yaml_sequence_end_event_initialize(&e.event)
+	e.emit()
+}
+
+func (e *Encoder) emitBase64(tag string, v reflect.Value) {
+	if v.IsNil() {
+		e.emitNil()
+		return
+	}
+
+	s := v.Bytes()
+
+	dst := make([]byte, base64.StdEncoding.EncodedLen(len(s)))
+
+	base64.StdEncoding.Encode(dst, s)
+	e.emitScalar(string(dst), "", yaml_BINARY_TAG, yaml_DOUBLE_QUOTED_SCALAR_STYLE)
+}
+
+func (e *Encoder) emitString(tag string, v reflect.Value) {
+	var style yaml_scalar_style_t
+	s := v.String()
+
+	if nonPrintable.MatchString(s) {
+		e.emitBase64(tag, v)
+		return
+	}
+
+	if v.Type() == numberType {
+		style = yaml_PLAIN_SCALAR_STYLE
+	} else {
+		event := yaml_event_t{
+			implicit: true,
+			value:    []byte(s),
+		}
+
+		rtag, _ := resolveInterface(event, false)
+		if tag == "" && rtag != yaml_STR_TAG {
+			style = yaml_DOUBLE_QUOTED_SCALAR_STYLE
+		} else if multiline.MatchString(s) {
+			style = yaml_LITERAL_SCALAR_STYLE
+		} else {
+			style = yaml_PLAIN_SCALAR_STYLE
+		}
+	}
+
+	e.emitScalar(s, "", tag, style)
+}
+
+func (e *Encoder) emitBool(tag string, v reflect.Value) {
+	s := strconv.FormatBool(v.Bool())
+	e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
+}
+
+func (e *Encoder) emitInt(tag string, v reflect.Value) {
+	s := strconv.FormatInt(v.Int(), 10)
+	e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
+}
+
+func (e *Encoder) emitUint(tag string, v reflect.Value) {
+	s := strconv.FormatUint(v.Uint(), 10)
+	e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
+}
+
+func (e *Encoder) emitFloat(tag string, v reflect.Value) {
+	f := v.Float()
+
+	var s string
+	switch {
+	case math.IsNaN(f):
+		s = ".nan"
+	case math.IsInf(f, 1):
+		s = "+.inf"
+	case math.IsInf(f, -1):
+		s = "-.inf"
+	default:
+		s = strconv.FormatFloat(f, 'g', -1, v.Type().Bits())
+	}
+
+	e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
+}
+
+func (e *Encoder) emitNil() {
+	e.emitScalar("null", "", "", yaml_PLAIN_SCALAR_STYLE)
+}
+
+func (e *Encoder) emitScalar(value, anchor, tag string, style yaml_scalar_style_t) {
+	implicit := tag == ""
+	if !implicit {
+		style = yaml_PLAIN_SCALAR_STYLE
+	}
+
+	stag := shortTags[tag]
+	if stag == "" {
+		stag = tag
+	}
+
+	yaml_scalar_event_initialize(&e.event, []byte(anchor), []byte(stag), []byte(value), implicit, implicit, style)
+	e.emit()
+}
+
+func (e *Encoder) emitMarshaler(tag string, v reflect.Value) {
+	if v.Kind() == reflect.Ptr && v.IsNil() {
+		e.emitNil()
+		return
+	}
+
+	m := v.Interface().(Marshaler)
+	if m == nil {
+		e.emitNil()
+		return
+	}
+	t, val, err := m.MarshalYAML()
+	if err != nil {
+		panic(err)
+	}
+	if val == nil {
+		e.emitNil()
+		return
+	}
+
+	e.marshal(t, reflect.ValueOf(val), false)
+}
+
+func (e *Encoder) emitAddrMarshaler(tag string, v reflect.Value) {
+	if !v.CanAddr() {
+		e.marshal(tag, v, false)
+		return
+	}
+
+	va := v.Addr()
+	if va.IsNil() {
+		e.emitNil()
+		return
+	}
+
+	m := v.Interface().(Marshaler)
+	t, val, err := m.MarshalYAML()
+	if err != nil {
+		panic(err)
+	}
+
+	if val == nil {
+		e.emitNil()
+		return
+	}
+
+	e.marshal(t, reflect.ValueOf(val), false)
+}

vendor/github.com/cloudfoundry-incubator/candiedyaml/libyaml-LICENSE

@@ -0,0 +1,19 @@
+Copyright (c) 2006 Kirill Simonov
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/cloudfoundry-incubator/candiedyaml/reader.go

@@ -0,0 +1,465 @@
+/*
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package candiedyaml
+
+import (
+	"io"
+)
+
+/*
+ * Set the reader error and return 0.
+ */
+
+func yaml_parser_set_reader_error(parser *yaml_parser_t, problem string,
+	offset int, value int) bool {
+	parser.error = yaml_READER_ERROR
+	parser.problem = problem
+	parser.problem_offset = offset
+	parser.problem_value = value
+
+	return false
+}
+
+/*
+ * Byte order marks.
+ */
+const (
+	BOM_UTF8    = "\xef\xbb\xbf"
+	BOM_UTF16LE = "\xff\xfe"
+	BOM_UTF16BE = "\xfe\xff"
+)
+
+/*
+ * Determine the input stream encoding by checking the BOM symbol. If no BOM is
+ * found, the UTF-8 encoding is assumed. Return 1 on success, 0 on failure.
+ */
+
+func yaml_parser_determine_encoding(parser *yaml_parser_t) bool {
+	/* Ensure that we had enough bytes in the raw buffer. */
+	for !parser.eof &&
+		len(parser.raw_buffer)-parser.raw_buffer_pos < 3 {
+		if !yaml_parser_update_raw_buffer(parser) {
+			return false
+		}
+	}
+
+	/* Determine the encoding. */
+	raw := parser.raw_buffer
+	pos := parser.raw_buffer_pos
+	remaining := len(raw) - pos
+	if remaining >= 2 &&
+		raw[pos] == BOM_UTF16LE[0] && raw[pos+1] == BOM_UTF16LE[1] {
+		parser.encoding = yaml_UTF16LE_ENCODING
+		parser.raw_buffer_pos += 2
+		parser.offset += 2
+	} else if remaining >= 2 &&
+		raw[pos] == BOM_UTF16BE[0] && raw[pos+1] == BOM_UTF16BE[1] {
+		parser.encoding = yaml_UTF16BE_ENCODING
+		parser.raw_buffer_pos += 2
+		parser.offset += 2
+	} else if remaining >= 3 &&
+		raw[pos] == BOM_UTF8[0] && raw[pos+1] == BOM_UTF8[1] && raw[pos+2] == BOM_UTF8[2] {
+		parser.encoding = yaml_UTF8_ENCODING
+		parser.raw_buffer_pos += 3
+		parser.offset += 3
+	} else {
+		parser.encoding = yaml_UTF8_ENCODING
+	}
+
+	return true
+}
+
+/*
+ * Update the raw buffer.
+ */
+
+func yaml_parser_update_raw_buffer(parser *yaml_parser_t) bool {
+	size_read := 0
+
+	/* Return if the raw buffer is full. */
+	if parser.raw_buffer_pos == 0 && len(parser.raw_buffer) == cap(parser.raw_buffer) {
+		return true
+	}
+
+	/* Return on EOF. */
+
+	if parser.eof {
+		return true
+	}
+
+	/* Move the remaining bytes in the raw buffer to the beginning. */
+	if parser.raw_buffer_pos > 0 && parser.raw_buffer_pos < len(parser.raw_buffer) {
+		copy(parser.raw_buffer, parser.raw_buffer[parser.raw_buffer_pos:])
+	}
+	parser.raw_buffer = parser.raw_buffer[:len(parser.raw_buffer)-parser.raw_buffer_pos]
+	parser.raw_buffer_pos = 0
+
+	/* Call the read handler to fill the buffer. */
+	size_read, err := parser.read_handler(parser,
+		parser.raw_buffer[len(parser.raw_buffer):cap(parser.raw_buffer)])
+	parser.raw_buffer = parser.raw_buffer[:len(parser.raw_buffer)+size_read]
+
+	if err == io.EOF {
+		parser.eof = true
+	} else if err != nil {
+		return yaml_parser_set_reader_error(parser, "input error: "+err.Error(),
+			parser.offset, -1)
+	}
+
+	return true
+}
+
+/*
+ * Ensure that the buffer contains at least `length` characters.
+ * Return 1 on success, 0 on failure.
+ *
+ * The length is supposed to be significantly less that the buffer size.
+ */
+
+func yaml_parser_update_buffer(parser *yaml_parser_t, length int) bool {
+	/* Read handler must be set. */
+	if parser.read_handler == nil {
+		panic("read handler must be set")
+	}
+
+	/* If the EOF flag is set and the raw buffer is empty, do nothing. */
+
+	if parser.eof && parser.raw_buffer_pos == len(parser.raw_buffer) {
+		return true
+	}
+
+	/* Return if the buffer contains enough characters. */
+
+	if parser.unread >= length {
+		return true
+	}
+
+	/* Determine the input encoding if it is not known yet. */
+
+	if parser.encoding == yaml_ANY_ENCODING {
+		if !yaml_parser_determine_encoding(parser) {
+			return false
+		}
+	}
+
+	/* Move the unread characters to the beginning of the buffer. */
+	buffer_end := len(parser.buffer)
+	if 0 < parser.buffer_pos &&
+		parser.buffer_pos < buffer_end {
+		copy(parser.buffer, parser.buffer[parser.buffer_pos:])
+		buffer_end -= parser.buffer_pos
+		parser.buffer_pos = 0
+	} else if parser.buffer_pos == buffer_end {
+		buffer_end = 0
+		parser.buffer_pos = 0
+	}
+
+	parser.buffer = parser.buffer[:cap(parser.buffer)]
+
+	/* Fill the buffer until it has enough characters. */
+	first := true
+	for parser.unread < length {
+		/* Fill the raw buffer if necessary. */
+
+		if !first || parser.raw_buffer_pos == len(parser.raw_buffer) {
+			if !yaml_parser_update_raw_buffer(parser) {
+				parser.buffer = parser.buffer[:buffer_end]
+				return false
+			}
+		}
+		first = false
+
+		/* Decode the raw buffer. */
+		for parser.raw_buffer_pos != len(parser.raw_buffer) {
+			var value rune
+			var w int
+
+			raw_unread := len(parser.raw_buffer) - parser.raw_buffer_pos
+			incomplete := false
+
+			/* Decode the next character. */
+
+			switch parser.encoding {
+			case yaml_UTF8_ENCODING:
+
+				/*
+				 * Decode a UTF-8 character.  Check RFC 3629
+				 * (http://www.ietf.org/rfc/rfc3629.txt) for more details.
+				 *
+				 * The following table (taken from the RFC) is used for
+				 * decoding.
+				 *
+				 *    Char. number range |        UTF-8 octet sequence
+				 *      (hexadecimal)    |              (binary)
+				 *   --------------------+------------------------------------
+				 *   0000 0000-0000 007F | 0xxxxxxx
+				 *   0000 0080-0000 07FF | 110xxxxx 10xxxxxx
+				 *   0000 0800-0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx
+				 *   0001 0000-0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
+				 *
+				 * Additionally, the characters in the range 0xD800-0xDFFF
+				 * are prohibited as they are reserved for use with UTF-16
+				 * surrogate pairs.
+				 */
+
+				/* Determine the length of the UTF-8 sequence. */
+
+				octet := parser.raw_buffer[parser.raw_buffer_pos]
+				w = width(octet)
+
+				/* Check if the leading octet is valid. */
+
+				if w == 0 {
+					return yaml_parser_set_reader_error(parser,
+						"invalid leading UTF-8 octet",
+						parser.offset, int(octet))
+				}
+
+				/* Check if the raw buffer contains an incomplete character. */
+
+				if w > raw_unread {
+					if parser.eof {
+						return yaml_parser_set_reader_error(parser,
+							"incomplete UTF-8 octet sequence",
+							parser.offset, -1)
+					}
+					incomplete = true
+					break
+				}
+
+				/* Decode the leading octet. */
+				switch {
+				case octet&0x80 == 0x00:
+					value = rune(octet & 0x7F)
+				case octet&0xE0 == 0xC0:
+					value = rune(octet & 0x1F)
+				case octet&0xF0 == 0xE0:
+					value = rune(octet & 0x0F)
+				case octet&0xF8 == 0xF0:
+					value = rune(octet & 0x07)
+				default:
+					value = 0
+				}
+
+				/* Check and decode the trailing octets. */
+
+				for k := 1; k < w; k++ {
+					octet = parser.raw_buffer[parser.raw_buffer_pos+k]
+
+					/* Check if the octet is valid. */
+
+					if (octet & 0xC0) != 0x80 {
+						return yaml_parser_set_reader_error(parser,
+							"invalid trailing UTF-8 octet",
+							parser.offset+k, int(octet))
+					}
+
+					/* Decode the octet. */
+
+					value = (value << 6) + rune(octet&0x3F)
+				}
+
+				/* Check the length of the sequence against the value. */
+				switch {
+				case w == 1:
+				case w == 2 && value >= 0x80:
+				case w == 3 && value >= 0x800:
+				case w == 4 && value >= 0x10000:
+				default:
+					return yaml_parser_set_reader_error(parser,
+						"invalid length of a UTF-8 sequence",
+						parser.offset, -1)
+				}
+
+				/* Check the range of the value. */
+
+				if (value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF {
+					return yaml_parser_set_reader_error(parser,
+						"invalid Unicode character",
+						parser.offset, int(value))
+				}
+			case yaml_UTF16LE_ENCODING,
+				yaml_UTF16BE_ENCODING:
+
+				var low, high int
+				if parser.encoding == yaml_UTF16LE_ENCODING {
+					low, high = 0, 1
+				} else {
+					high, low = 1, 0
+				}
+
+				/*
+				 * The UTF-16 encoding is not as simple as one might
+				 * naively think.  Check RFC 2781
+				 * (http://www.ietf.org/rfc/rfc2781.txt).
+				 *
+				 * Normally, two subsequent bytes describe a Unicode
+				 * character.  However a special technique (called a
+				 * surrogate pair) is used for specifying character
+				 * values larger than 0xFFFF.
+				 *
+				 * A surrogate pair consists of two pseudo-characters:
+				 *      high surrogate area (0xD800-0xDBFF)
+				 *      low surrogate area (0xDC00-0xDFFF)
+				 *
+				 * The following formulas are used for decoding
+				 * and encoding characters using surrogate pairs:
+				 *
+				 *  U  = U' + 0x10000   (0x01 00 00 <= U <= 0x10 FF FF)
+				 *  U' = yyyyyyyyyyxxxxxxxxxx   (0 <= U' <= 0x0F FF FF)
+				 *  W1 = 110110yyyyyyyyyy
+				 *  W2 = 110111xxxxxxxxxx
+				 *
+				 * where U is the character value, W1 is the high surrogate
+				 * area, W2 is the low surrogate area.
+				 */
+
+				/* Check for incomplete UTF-16 character. */
+
+				if raw_unread < 2 {
+					if parser.eof {
+						return yaml_parser_set_reader_error(parser,
+							"incomplete UTF-16 character",
+							parser.offset, -1)
+					}
+					incomplete = true
+					break
+				}
+
+				/* Get the character. */
+				value = rune(parser.raw_buffer[parser.raw_buffer_pos+low]) +
+					(rune(parser.raw_buffer[parser.raw_buffer_pos+high]) << 8)
+
+				/* Check for unexpected low surrogate area. */
+
+				if (value & 0xFC00) == 0xDC00 {
+					return yaml_parser_set_reader_error(parser,
+						"unexpected low surrogate area",
+						parser.offset, int(value))
+				}
+
+				/* Check for a high surrogate area. */
+
+				if (value & 0xFC00) == 0xD800 {
+
+					w = 4
+
+					/* Check for incomplete surrogate pair. */
+
+					if raw_unread < 4 {
+						if parser.eof {
+							return yaml_parser_set_reader_error(parser,
+								"incomplete UTF-16 surrogate pair",
+								parser.offset, -1)
+						}
+						incomplete = true
+						break
+					}
+
+					/* Get the next character. */
+
+					value2 := rune(parser.raw_buffer[parser.raw_buffer_pos+low+2]) +
+						(rune(parser.raw_buffer[parser.raw_buffer_pos+high+2]) << 8)
+
+					/* Check for a low surrogate area. */
+
+					if (value2 & 0xFC00) != 0xDC00 {
+						return yaml_parser_set_reader_error(parser,
+							"expected low surrogate area",
+							parser.offset+2, int(value2))
+					}
+
+					/* Generate the value of the surrogate pair. */
+
+					value = 0x10000 + ((value & 0x3FF) << 10) + (value2 & 0x3FF)
+				} else {
+					w = 2
+				}
+
+				break
+
+			default:
+				panic("Impossible") /* Impossible. */
+			}
+
+			/* Check if the raw buffer contains enough bytes to form a character. */
+
+			if incomplete {
+				break
+			}
+
+			/*
+			 * Check if the character is in the allowed range:
+			 *      #x9 | #xA | #xD | [#x20-#x7E]               (8 bit)
+			 *      | #x85 | [#xA0-#xD7FF] | [#xE000-#xFFFD]    (16 bit)
+			 *      | [#x10000-#x10FFFF]                        (32 bit)
+			 */
+
+			if !(value == 0x09 || value == 0x0A || value == 0x0D ||
+				(value >= 0x20 && value <= 0x7E) ||
+				(value == 0x85) || (value >= 0xA0 && value <= 0xD7FF) ||
+				(value >= 0xE000 && value <= 0xFFFD) ||
+				(value >= 0x10000 && value <= 0x10FFFF)) {
+				return yaml_parser_set_reader_error(parser,
+					"control characters are not allowed",
+					parser.offset, int(value))
+			}
+
+			/* Move the raw pointers. */
+
+			parser.raw_buffer_pos += w
+			parser.offset += w
+
+			/* Finally put the character into the buffer. */
+
+			/* 0000 0000-0000 007F . 0xxxxxxx */
+			if value <= 0x7F {
+				parser.buffer[buffer_end] = byte(value)
+			} else if value <= 0x7FF {
+				/* 0000 0080-0000 07FF . 110xxxxx 10xxxxxx */
+				parser.buffer[buffer_end] = byte(0xC0 + (value >> 6))
+				parser.buffer[buffer_end+1] = byte(0x80 + (value & 0x3F))
+			} else if value <= 0xFFFF {
+				/* 0000 0800-0000 FFFF . 1110xxxx 10xxxxxx 10xxxxxx */
+				parser.buffer[buffer_end] = byte(0xE0 + (value >> 12))
+				parser.buffer[buffer_end+1] = byte(0x80 + ((value >> 6) & 0x3F))
+				parser.buffer[buffer_end+2] = byte(0x80 + (value & 0x3F))
+			} else {
+				/* 0001 0000-0010 FFFF . 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */
+				parser.buffer[buffer_end] = byte(0xF0 + (value >> 18))
+				parser.buffer[buffer_end+1] = byte(0x80 + ((value >> 12) & 0x3F))
+				parser.buffer[buffer_end+2] = byte(0x80 + ((value >> 6) & 0x3F))
+				parser.buffer[buffer_end+3] = byte(0x80 + (value & 0x3F))
+			}
+
+			buffer_end += w
+			parser.unread++
+		}
+
+		/* On EOF, put NUL into the buffer and return. */
+
+		if parser.eof {
+			parser.buffer[buffer_end] = 0
+			buffer_end++
+			parser.buffer = parser.buffer[:buffer_end]
+			parser.unread++
+			return true
+		}
+
+	}
+
+	parser.buffer = parser.buffer[:buffer_end]
+	return true
+}

vendor/github.com/cloudfoundry-incubator/candiedyaml/resolver.go

@@ -0,0 +1,449 @@
+/*
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package candiedyaml
+
+import (
+	"bytes"
+	"encoding/base64"
+	"fmt"
+	"math"
+	"reflect"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var byteSliceType = reflect.TypeOf([]byte(nil))
+
+var binary_tags = [][]byte{[]byte("!binary"), []byte(yaml_BINARY_TAG)}
+var bool_values map[string]bool
+var null_values map[string]bool
+
+var signs = []byte{'-', '+'}
+var nulls = []byte{'~', 'n', 'N'}
+var bools = []byte{'t', 'T', 'f', 'F', 'y', 'Y', 'n', 'N', 'o', 'O'}
+
+var timestamp_regexp *regexp.Regexp
+var ymd_regexp *regexp.Regexp
+
+func init() {
+	bool_values = make(map[string]bool)
+	bool_values["y"] = true
+	bool_values["yes"] = true
+	bool_values["n"] = false
+	bool_values["no"] = false
+	bool_values["true"] = true
+	bool_values["false"] = false
+	bool_values["on"] = true
+	bool_values["off"] = false
+
+	null_values = make(map[string]bool)
+	null_values["~"] = true
+	null_values["null"] = true
+	null_values["Null"] = true
+	null_values["NULL"] = true
+
+	timestamp_regexp = regexp.MustCompile("^([0-9][0-9][0-9][0-9])-([0-9][0-9]?)-([0-9][0-9]?)(?:(?:[Tt]|[ \t]+)([0-9][0-9]?):([0-9][0-9]):([0-9][0-9])(?:\\.([0-9]*))?(?:[ \t]*(?:Z|([-+][0-9][0-9]?)(?::([0-9][0-9])?)?))?)?$")
+	ymd_regexp = regexp.MustCompile("^([0-9][0-9][0-9][0-9])-([0-9][0-9]?)-([0-9][0-9]?)$")
+}
+
+func resolve(event yaml_event_t, v reflect.Value, useNumber bool) (string, error) {
+	val := string(event.value)
+
+	if null_values[val] {
+		v.Set(reflect.Zero(v.Type()))
+		return yaml_NULL_TAG, nil
+	}
+
+	switch v.Kind() {
+	case reflect.String:
+		if useNumber && v.Type() == numberType {
+			tag, i := resolveInterface(event, useNumber)
+			if n, ok := i.(Number); ok {
+				v.Set(reflect.ValueOf(n))
+				return tag, nil
+			}
+			return "", fmt.Errorf("Not a number: '%s' at %s", event.value, event.start_mark)
+		}
+
+		return resolve_string(val, v, event)
+	case reflect.Bool:
+		return resolve_bool(val, v, event)
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return resolve_int(val, v, useNumber, event)
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return resolve_uint(val, v, useNumber, event)
+	case reflect.Float32, reflect.Float64:
+		return resolve_float(val, v, useNumber, event)
+	case reflect.Interface:
+		_, i := resolveInterface(event, useNumber)
+		if i != nil {
+			v.Set(reflect.ValueOf(i))
+		} else {
+			v.Set(reflect.Zero(v.Type()))
+		}
+
+	case reflect.Struct:
+		return resolve_time(val, v, event)
+	case reflect.Slice:
+		if v.Type() != byteSliceType {
+			return "", fmt.Errorf("Cannot resolve %s into %s at %s", val, v.String(), event.start_mark)
+		}
+		b, err := decode_binary(event.value, event)
+		if err != nil {
+			return "", err
+		}
+
+		v.Set(reflect.ValueOf(b))
+	default:
+		return "", fmt.Errorf("Unknown resolution for '%s' using %s at %s", val, v.String(), event.start_mark)
+	}
+
+	return yaml_STR_TAG, nil
+}
+
+func hasBinaryTag(event yaml_event_t) bool {
+	for _, tag := range binary_tags {
+		if bytes.Equal(event.tag, tag) {
+			return true
+		}
+	}
+	return false
+}
+
+func decode_binary(value []byte, event yaml_event_t) ([]byte, error) {
+	b := make([]byte, base64.StdEncoding.DecodedLen(len(value)))
+	n, err := base64.StdEncoding.Decode(b, value)
+	if err != nil {
+		return nil, fmt.Errorf("Invalid base64 text: '%s' at %s", string(b), event.start_mark)
+	}
+	return b[:n], nil
+}
+
+func resolve_string(val string, v reflect.Value, event yaml_event_t) (string, error) {
+	if len(event.tag) > 0 {
+		if hasBinaryTag(event) {
+			b, err := decode_binary(event.value, event)
+			if err != nil {
+				return "", err
+			}
+			val = string(b)
+		}
+	}
+	v.SetString(val)
+	return yaml_STR_TAG, nil
+}
+
+func resolve_bool(val string, v reflect.Value, event yaml_event_t) (string, error) {
+	b, found := bool_values[strings.ToLower(val)]
+	if !found {
+		return "", fmt.Errorf("Invalid boolean: '%s' at %s", val, event.start_mark)
+	}
+
+	v.SetBool(b)
+	return yaml_BOOL_TAG, nil
+}
+
+func resolve_int(val string, v reflect.Value, useNumber bool, event yaml_event_t) (string, error) {
+	original := val
+	val = strings.Replace(val, "_", "", -1)
+	var value uint64
+
+	isNumberValue := v.Type() == numberType
+
+	sign := int64(1)
+	if val[0] == '-' {
+		sign = -1
+		val = val[1:]
+	} else if val[0] == '+' {
+		val = val[1:]
+	}
+
+	base := 0
+	if val == "0" {
+		if isNumberValue {
+			v.SetString("0")
+		} else {
+			v.Set(reflect.Zero(v.Type()))
+		}
+
+		return yaml_INT_TAG, nil
+	}
+
+	if strings.HasPrefix(val, "0o") {
+		base = 8
+		val = val[2:]
+	}
+
+	value, err := strconv.ParseUint(val, base, 64)
+	if err != nil {
+		return "", fmt.Errorf("Invalid integer: '%s' at %s", original, event.start_mark)
+	}
+
+	var val64 int64
+	if value <= math.MaxInt64 {
+		val64 = int64(value)
+		if sign == -1 {
+			val64 = -val64
+		}
+	} else if sign == -1 && value == uint64(math.MaxInt64)+1 {
+		val64 = math.MinInt64
+	} else {
+		return "", fmt.Errorf("Invalid integer: '%s' at %s", original, event.start_mark)
+	}
+
+	if isNumberValue {
+		v.SetString(strconv.FormatInt(val64, 10))
+	} else {
+		if v.OverflowInt(val64) {
+			return "", fmt.Errorf("Invalid integer: '%s' at %s", original, event.start_mark)
+		}
+		v.SetInt(val64)
+	}
+
+	return yaml_INT_TAG, nil
+}
+
+func resolve_uint(val string, v reflect.Value, useNumber bool, event yaml_event_t) (string, error) {
+	original := val
+	val = strings.Replace(val, "_", "", -1)
+	var value uint64
+
+	isNumberValue := v.Type() == numberType
+
+	if val[0] == '-' {
+		return "", fmt.Errorf("Unsigned int with negative value: '%s' at %s", original, event.start_mark)
+	}
+
+	if val[0] == '+' {
+		val = val[1:]
+	}
+
+	base := 0
+	if val == "0" {
+		if isNumberValue {
+			v.SetString("0")
+		} else {
+			v.Set(reflect.Zero(v.Type()))
+		}
+
+		return yaml_INT_TAG, nil
+	}
+
+	if strings.HasPrefix(val, "0o") {
+		base = 8
+		val = val[2:]
+	}
+
+	value, err := strconv.ParseUint(val, base, 64)
+	if err != nil {
+		return "", fmt.Errorf("Invalid unsigned integer: '%s' at %s", val, event.start_mark)
+	}
+
+	if isNumberValue {
+		v.SetString(strconv.FormatUint(value, 10))
+	} else {
+		if v.OverflowUint(value) {
+			return "", fmt.Errorf("Invalid unsigned integer: '%s' at %s", val, event.start_mark)
+		}
+
+		v.SetUint(value)
+	}
+
+	return yaml_INT_TAG, nil
+}
+
+func resolve_float(val string, v reflect.Value, useNumber bool, event yaml_event_t) (string, error) {
+	val = strings.Replace(val, "_", "", -1)
+	var value float64
+
+	isNumberValue := v.Type() == numberType
+	typeBits := 64
+	if !isNumberValue {
+		typeBits = v.Type().Bits()
+	}
+
+	sign := 1
+	if val[0] == '-' {
+		sign = -1
+		val = val[1:]
+	} else if val[0] == '+' {
+		val = val[1:]
+	}
+
+	valLower := strings.ToLower(val)
+	if valLower == ".inf" {
+		value = math.Inf(sign)
+	} else if valLower == ".nan" {
+		value = math.NaN()
+	} else {
+		var err error
+		value, err = strconv.ParseFloat(val, typeBits)
+		value *= float64(sign)
+
+		if err != nil {
+			return "", fmt.Errorf("Invalid float: '%s' at %s", val, event.start_mark)
+		}
+	}
+
+	if isNumberValue {
+		v.SetString(strconv.FormatFloat(value, 'g', -1, typeBits))
+	} else {
+		if v.OverflowFloat(value) {
+			return "", fmt.Errorf("Invalid float: '%s' at %s", val, event.start_mark)
+		}
+
+		v.SetFloat(value)
+	}
+
+	return yaml_FLOAT_TAG, nil
+}
+
+func resolve_time(val string, v reflect.Value, event yaml_event_t) (string, error) {
+	var parsedTime time.Time
+	matches := ymd_regexp.FindStringSubmatch(val)
+	if len(matches) > 0 {
+		year, _ := strconv.Atoi(matches[1])
+		month, _ := strconv.Atoi(matches[2])
+		day, _ := strconv.Atoi(matches[3])
+		parsedTime = time.Date(year, time.Month(month), day, 0, 0, 0, 0, time.UTC)
+	} else {
+		matches = timestamp_regexp.FindStringSubmatch(val)
+		if len(matches) == 0 {
+			return "", fmt.Errorf("Invalid timestamp: '%s' at %s", val, event.start_mark)
+		}
+
+		year, _ := strconv.Atoi(matches[1])
+		month, _ := strconv.Atoi(matches[2])
+		day, _ := strconv.Atoi(matches[3])
+		hour, _ := strconv.Atoi(matches[4])
+		min, _ := strconv.Atoi(matches[5])
+		sec, _ := strconv.Atoi(matches[6])
+
+		nsec := 0
+		if matches[7] != "" {
+			millis, _ := strconv.Atoi(matches[7])
+			nsec = int(time.Duration(millis) * time.Millisecond)
+		}
+
+		loc := time.UTC
+		if matches[8] != "" {
+			sign := matches[8][0]
+			hr, _ := strconv.Atoi(matches[8][1:])
+			min := 0
+			if matches[9] != "" {
+				min, _ = strconv.Atoi(matches[9])
+			}
+
+			zoneOffset := (hr*60 + min) * 60
+			if sign == '-' {
+				zoneOffset = -zoneOffset
+			}
+
+			loc = time.FixedZone("", zoneOffset)
+		}
+		parsedTime = time.Date(year, time.Month(month), day, hour, min, sec, nsec, loc)
+	}
+
+	v.Set(reflect.ValueOf(parsedTime))
+	return "", nil
+}
+
+func resolveInterface(event yaml_event_t, useNumber bool) (string, interface{}) {
+	val := string(event.value)
+	if len(event.tag) == 0 && !event.implicit {
+		return "", val
+	}
+
+	if len(val) == 0 {
+		return yaml_NULL_TAG, nil
+	}
+
+	var result interface{}
+
+	sign := false
+	c := val[0]
+	switch {
+	case bytes.IndexByte(signs, c) != -1:
+		sign = true
+		fallthrough
+	case c >= '0' && c <= '9':
+		i := int64(0)
+		result = &i
+		if useNumber {
+			var n Number
+			result = &n
+		}
+
+		v := reflect.ValueOf(result).Elem()
+		if _, err := resolve_int(val, v, useNumber, event); err == nil {
+			return yaml_INT_TAG, v.Interface()
+		}
+
+		f := float64(0)
+		result = &f
+		if useNumber {
+			var n Number
+			result = &n
+		}
+
+		v = reflect.ValueOf(result).Elem()
+		if _, err := resolve_float(val, v, useNumber, event); err == nil {
+			return yaml_FLOAT_TAG, v.Interface()
+		}
+
+		if !sign {
+			t := time.Time{}
+			if _, err := resolve_time(val, reflect.ValueOf(&t).Elem(), event); err == nil {
+				return "", t
+			}
+		}
+	case bytes.IndexByte(nulls, c) != -1:
+		if null_values[val] {
+			return yaml_NULL_TAG, nil
+		}
+		b := false
+		if _, err := resolve_bool(val, reflect.ValueOf(&b).Elem(), event); err == nil {
+			return yaml_BOOL_TAG, b
+		}
+	case c == '.':
+		f := float64(0)
+		result = &f
+		if useNumber {
+			var n Number
+			result = &n
+		}
+
+		v := reflect.ValueOf(result).Elem()
+		if _, err := resolve_float(val, v, useNumber, event); err == nil {
+			return yaml_FLOAT_TAG, v.Interface()
+		}
+	case bytes.IndexByte(bools, c) != -1:
+		b := false
+		if _, err := resolve_bool(val, reflect.ValueOf(&b).Elem(), event); err == nil {
+			return yaml_BOOL_TAG, b
+		}
+	}
+
+	if hasBinaryTag(event) {
+		bytes, err := decode_binary(event.value, event)
+		if err == nil {
+			return yaml_BINARY_TAG, bytes
+		}
+	}
+
+	return yaml_STR_TAG, val
+}

vendor/github.com/cloudfoundry-incubator/candiedyaml/run_parser.go

@@ -0,0 +1,62 @@
+/*
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package candiedyaml
+
+import (
+	"fmt"
+	"os"
+)
+
+func Run_parser(cmd string, args []string) {
+	for i := 0; i < len(args); i++ {
+		fmt.Printf("[%d] Scanning '%s'", i, args[i])
+		file, err := os.Open(args[i])
+		if err != nil {
+			panic(fmt.Sprintf("Invalid file '%s': %s", args[i], err.Error()))
+		}
+
+		parser := yaml_parser_t{}
+		yaml_parser_initialize(&parser)
+		yaml_parser_set_input_reader(&parser, file)
+
+		failed := false
+		token := yaml_token_t{}
+		count := 0
+		for {
+			if !yaml_parser_scan(&parser, &token) {
+				failed = true
+				break
+			}
+
+			if token.token_type == yaml_STREAM_END_TOKEN {
+				break
+			}
+			count++
+		}
+
+		file.Close()
+
+		msg := "SUCCESS"
+		if failed {
+			msg = "FAILED"
+			if parser.error != yaml_NO_ERROR {
+				m := parser.problem_mark
+				fmt.Printf("ERROR: (%s) %s @ line: %d  col: %d\n",
+					parser.context, parser.problem, m.line, m.column)
+			}
+		}
+		fmt.Printf("%s (%d tokens)\n", msg, count)
+	}
+}

vendor/github.com/cloudfoundry-incubator/candiedyaml/tags.go

@@ -0,0 +1,360 @@
+/*
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package candiedyaml
+
+import (
+	"reflect"
+	"sort"
+	"strings"
+	"sync"
+	"unicode"
+)
+
+// A field represents a single field found in a struct.
+type field struct {
+	name      string
+	tag       bool
+	index     []int
+	typ       reflect.Type
+	omitEmpty bool
+	flow      bool
+}
+
+// byName sorts field by name, breaking ties with depth,
+// then breaking ties with "name came from json tag", then
+// breaking ties with index sequence.
+type byName []field
+
+func (x byName) Len() int { return len(x) }
+
+func (x byName) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
+
+func (x byName) Less(i, j int) bool {
+	if x[i].name != x[j].name {
+		return x[i].name < x[j].name
+	}
+	if len(x[i].index) != len(x[j].index) {
+		return len(x[i].index) < len(x[j].index)
+	}
+	if x[i].tag != x[j].tag {
+		return x[i].tag
+	}
+	return byIndex(x).Less(i, j)
+}
+
+// byIndex sorts field by index sequence.
+type byIndex []field
+
+func (x byIndex) Len() int { return len(x) }
+
+func (x byIndex) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
+
+func (x byIndex) Less(i, j int) bool {
+	for k, xik := range x[i].index {
+		if k >= len(x[j].index) {
+			return false
+		}
+		if xik != x[j].index[k] {
+			return xik < x[j].index[k]
+		}
+	}
+	return len(x[i].index) < len(x[j].index)
+}
+
+// typeFields returns a list of fields that JSON should recognize for the given type.
+// The algorithm is breadth-first search over the set of structs to include - the top struct
+// and then any reachable anonymous structs.
+func typeFields(t reflect.Type) []field {
+	// Anonymous fields to explore at the current level and the next.
+	current := []field{}
+	next := []field{{typ: t}}
+
+	// Count of queued names for current level and the next.
+	count := map[reflect.Type]int{}
+	nextCount := map[reflect.Type]int{}
+
+	// Types already visited at an earlier level.
+	visited := map[reflect.Type]bool{}
+
+	// Fields found.
+	var fields []field
+
+	for len(next) > 0 {
+		current, next = next, current[:0]
+		count, nextCount = nextCount, map[reflect.Type]int{}
+
+		for _, f := range current {
+			if visited[f.typ] {
+				continue
+			}
+			visited[f.typ] = true
+
+			// Scan f.typ for fields to include.
+			for i := 0; i < f.typ.NumField(); i++ {
+				sf := f.typ.Field(i)
+				if sf.PkgPath != "" { // unexported
+					continue
+				}
+				tag := sf.Tag.Get("yaml")
+				if tag == "-" {
+					continue
+				}
+				name, opts := parseTag(tag)
+				if !isValidTag(name) {
+					name = ""
+				}
+				index := make([]int, len(f.index)+1)
+				copy(index, f.index)
+				index[len(f.index)] = i
+
+				ft := sf.Type
+				if ft.Name() == "" && ft.Kind() == reflect.Ptr {
+					// Follow pointer.
+					ft = ft.Elem()
+				}
+
+				// Record found field and index sequence.
+				if name != "" || !sf.Anonymous || ft.Kind() != reflect.Struct {
+					tagged := name != ""
+					if name == "" {
+						name = sf.Name
+					}
+					fields = append(fields, field{name, tagged, index, ft,
+						opts.Contains("omitempty"), opts.Contains("flow")})
+					if count[f.typ] > 1 {
+						// If there were multiple instances, add a second,
+						// so that the annihilation code will see a duplicate.
+						// It only cares about the distinction between 1 or 2,
+						// so don't bother generating any more copies.
+						fields = append(fields, fields[len(fields)-1])
+					}
+					continue
+				}
+
+				// Record new anonymous struct to explore in next round.
+				nextCount[ft]++
+				if nextCount[ft] == 1 {
+					next = append(next, field{name: ft.Name(), index: index, typ: ft})
+				}
+			}
+		}
+	}
+
+	sort.Sort(byName(fields))
+
+	// Delete all fields that are hidden by the Go rules for embedded fields,
+	// except that fields with JSON tags are promoted.
+
+	// The fields are sorted in primary order of name, secondary order
+	// of field index length. Loop over names; for each name, delete
+	// hidden fields by choosing the one dominant field that survives.
+	out := fields[:0]
+	for advance, i := 0, 0; i < len(fields); i += advance {
+		// One iteration per name.
+		// Find the sequence of fields with the name of this first field.
+		fi := fields[i]
+		name := fi.name
+		for advance = 1; i+advance < len(fields); advance++ {
+			fj := fields[i+advance]
+			if fj.name != name {
+				break
+			}
+		}
+		if advance == 1 { // Only one field with this name
+			out = append(out, fi)
+			continue
+		}
+		dominant, ok := dominantField(fields[i : i+advance])
+		if ok {
+			out = append(out, dominant)
+		}
+	}
+
+	fields = out
+	sort.Sort(byIndex(fields))
+
+	return fields
+}
+
+// dominantField looks through the fields, all of which are known to
+// have the same name, to find the single field that dominates the
+// others using Go's embedding rules, modified by the presence of
+// JSON tags. If there are multiple top-level fields, the boolean
+// will be false: This condition is an error in Go and we skip all
+// the fields.
+func dominantField(fields []field) (field, bool) {
+	// The fields are sorted in increasing index-length order. The winner
+	// must therefore be one with the shortest index length. Drop all
+	// longer entries, which is easy: just truncate the slice.
+	length := len(fields[0].index)
+	tagged := -1 // Index of first tagged field.
+	for i, f := range fields {
+		if len(f.index) > length {
+			fields = fields[:i]
+			break
+		}
+		if f.tag {
+			if tagged >= 0 {
+				// Multiple tagged fields at the same level: conflict.
+				// Return no field.
+				return field{}, false
+			}
+			tagged = i
+		}
+	}
+	if tagged >= 0 {
+		return fields[tagged], true
+	}
+	// All remaining fields have the same length. If there's more than one,
+	// we have a conflict (two fields named "X" at the same level) and we
+	// return no field.
+	if len(fields) > 1 {
+		return field{}, false
+	}
+	return fields[0], true
+}
+
+var fieldCache struct {
+	sync.RWMutex
+	m map[reflect.Type][]field
+}
+
+// cachedTypeFields is like typeFields but uses a cache to avoid repeated work.
+func cachedTypeFields(t reflect.Type) []field {
+	fieldCache.RLock()
+	f := fieldCache.m[t]
+	fieldCache.RUnlock()
+	if f != nil {
+		return f
+	}
+
+	// Compute fields without lock.
+	// Might duplicate effort but won't hold other computations back.
+	f = typeFields(t)
+	if f == nil {
+		f = []field{}
+	}
+
+	fieldCache.Lock()
+	if fieldCache.m == nil {
+		fieldCache.m = map[reflect.Type][]field{}
+	}
+	fieldCache.m[t] = f
+	fieldCache.Unlock()
+	return f
+}
+
+// tagOptions is the string following a comma in a struct field's "json"
+// tag, or the empty string. It does not include the leading comma.
+type tagOptions string
+
+func isValidTag(s string) bool {
+	if s == "" {
+		return false
+	}
+	for _, c := range s {
+		switch {
+		case strings.ContainsRune("!#$%&()*+-./:<=>?@[]^_{|}~ ", c):
+			// Backslash and quote chars are reserved, but
+			// otherwise any punctuation chars are allowed
+			// in a tag name.
+		default:
+			if !unicode.IsLetter(c) && !unicode.IsDigit(c) {
+				return false
+			}
+		}
+	}
+	return true
+}
+
+func fieldByIndex(v reflect.Value, index []int) reflect.Value {
+	for _, i := range index {
+		if v.Kind() == reflect.Ptr {
+			if v.IsNil() {
+				return reflect.Value{}
+			}
+			v = v.Elem()
+		}
+		v = v.Field(i)
+	}
+	return v
+}
+
+func typeByIndex(t reflect.Type, index []int) reflect.Type {
+	for _, i := range index {
+		if t.Kind() == reflect.Ptr {
+			t = t.Elem()
+		}
+		t = t.Field(i).Type
+	}
+	return t
+}
+
+// stringValues is a slice of reflect.Value holding *reflect.StringValue.
+// It implements the methods to sort by string.
+type stringValues []reflect.Value
+
+func (sv stringValues) Len() int      { return len(sv) }
+func (sv stringValues) Swap(i, j int) { sv[i], sv[j] = sv[j], sv[i] }
+func (sv stringValues) Less(i, j int) bool {
+	av, ak := getElem(sv[i])
+	bv, bk := getElem(sv[j])
+	if ak == reflect.String && bk == reflect.String {
+		return av.String() < bv.String()
+	}
+
+	return ak < bk
+}
+
+func getElem(v reflect.Value) (reflect.Value, reflect.Kind) {
+	k := v.Kind()
+	for k == reflect.Interface || k == reflect.Ptr && !v.IsNil() {
+		v = v.Elem()
+		k = v.Kind()
+	}
+
+	return v, k
+}
+
+// parseTag splits a struct field's json tag into its name and
+// comma-separated options.
+func parseTag(tag string) (string, tagOptions) {
+	if idx := strings.Index(tag, ","); idx != -1 {
+		return tag[:idx], tagOptions(tag[idx+1:])
+	}
+	return tag, tagOptions("")
+}
+
+// Contains reports whether a comma-separated list of options
+// contains a particular substr flag. substr must be surrounded by a
+// string boundary or commas.
+func (o tagOptions) Contains(optionName string) bool {
+	if len(o) == 0 {
+		return false
+	}
+	s := string(o)
+	for s != "" {
+		var next string
+		i := strings.Index(s, ",")
+		if i >= 0 {
+			s, next = s[:i], s[i+1:]
+		}
+		if s == optionName {
+			return true
+		}
+		s = next
+	}
+	return false
+}

vendor/github.com/cloudfoundry-incubator/candiedyaml/writer.go

@@ -0,0 +1,128 @@
+/*
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package candiedyaml
+
+/*
+ * Set the writer error and return 0.
+ */
+
+func yaml_emitter_set_writer_error(emitter *yaml_emitter_t, problem string) bool {
+	emitter.error = yaml_WRITER_ERROR
+	emitter.problem = problem
+
+	return false
+}
+
+/*
+ * Flush the output buffer.
+ */
+
+func yaml_emitter_flush(emitter *yaml_emitter_t) bool {
+	if emitter.write_handler == nil {
+		panic("Write handler must be set") /* Write handler must be set. */
+	}
+	if emitter.encoding == yaml_ANY_ENCODING {
+		panic("Encoding must be set") /* Output encoding must be set. */
+	}
+
+	/* Check if the buffer is empty. */
+
+	if emitter.buffer_pos == 0 {
+		return true
+	}
+
+	/* If the output encoding is UTF-8, we don't need to recode the buffer. */
+
+	if emitter.encoding == yaml_UTF8_ENCODING {
+		if err := emitter.write_handler(emitter,
+			emitter.buffer[:emitter.buffer_pos]); err != nil {
+			return yaml_emitter_set_writer_error(emitter, "write error: "+err.Error())
+		}
+		emitter.buffer_pos = 0
+		return true
+	}
+
+	/* Recode the buffer into the raw buffer. */
+
+	var low, high int
+	if emitter.encoding == yaml_UTF16LE_ENCODING {
+		low, high = 0, 1
+	} else {
+		high, low = 1, 0
+	}
+
+	pos := 0
+	for pos < emitter.buffer_pos {
+
+		/*
+		 * See the "reader.c" code for more details on UTF-8 encoding.  Note
+		 * that we assume that the buffer contains a valid UTF-8 sequence.
+		 */
+
+		/* Read the next UTF-8 character. */
+
+		octet := emitter.buffer[pos]
+
+		var w int
+		var value rune
+		switch {
+		case octet&0x80 == 0x00:
+			w, value = 1, rune(octet&0x7F)
+		case octet&0xE0 == 0xC0:
+			w, value = 2, rune(octet&0x1F)
+		case octet&0xF0 == 0xE0:
+			w, value = 3, rune(octet&0x0F)
+		case octet&0xF8 == 0xF0:
+			w, value = 4, rune(octet&0x07)
+		}
+
+		for k := 1; k < w; k++ {
+			octet = emitter.buffer[pos+k]
+			value = (value << 6) + (rune(octet) & 0x3F)
+		}
+
+		pos += w
+
+		/* Write the character. */
+
+		if value < 0x10000 {
+			var b [2]byte
+			b[high] = byte(value >> 8)
+			b[low] = byte(value & 0xFF)
+			emitter.raw_buffer = append(emitter.raw_buffer, b[0], b[1])
+		} else {
+			/* Write the character using a surrogate pair (check "reader.c"). */
+
+			var b [4]byte
+			value -= 0x10000
+			b[high] = byte(0xD8 + (value >> 18))
+			b[low] = byte((value >> 10) & 0xFF)
+			b[high+2] = byte(0xDC + ((value >> 8) & 0xFF))
+			b[low+2] = byte(value & 0xFF)
+			emitter.raw_buffer = append(emitter.raw_buffer, b[0], b[1], b[2], b[3])
+		}
+	}
+
+	/* Write the raw buffer. */
+
+	// Write the raw buffer.
+	if err := emitter.write_handler(emitter, emitter.raw_buffer); err != nil {
+		return yaml_emitter_set_writer_error(emitter, "write error: "+err.Error())
+	}
+
+	emitter.buffer_pos = 0
+	emitter.raw_buffer = emitter.raw_buffer[:0]
+	return true
+}

vendor/github.com/cloudfoundry-incubator/candiedyaml/yaml_definesh.go

@@ -0,0 +1,22 @@
+/*
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package candiedyaml
+
+const (
+	yaml_VERSION_MAJOR  = 0
+	yaml_VERSION_MINOR  = 1
+	yaml_VERSION_PATCH  = 6
+	yaml_VERSION_STRING = "0.1.6"
+)

vendor/github.com/cloudfoundry-incubator/candiedyaml/yaml_privateh.go

@@ -0,0 +1,891 @@
+/*
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package candiedyaml
+
+const (
+	INPUT_RAW_BUFFER_SIZE = 1024
+
+	/*
+	 * The size of the input buffer.
+	 *
+	 * It should be possible to decode the whole raw buffer.
+	 */
+	INPUT_BUFFER_SIZE = (INPUT_RAW_BUFFER_SIZE * 3)
+
+	/*
+	 * The size of the output buffer.
+	 */
+
+	OUTPUT_BUFFER_SIZE = 512
+
+	/*
+	 * The size of the output raw buffer.
+	 *
+	 * It should be possible to encode the whole output buffer.
+	 */
+
+	OUTPUT_RAW_BUFFER_SIZE = (OUTPUT_BUFFER_SIZE*2 + 2)
+
+	INITIAL_STACK_SIZE = 16
+	INITIAL_QUEUE_SIZE = 16
+)
+
+func width(b byte) int {
+	if b&0x80 == 0 {
+		return 1
+	}
+
+	if b&0xE0 == 0xC0 {
+		return 2
+	}
+
+	if b&0xF0 == 0xE0 {
+		return 3
+	}
+
+	if b&0xF8 == 0xF0 {
+		return 4
+	}
+
+	return 0
+}
+
+func copy_bytes(dest []byte, dest_pos *int, src []byte, src_pos *int) {
+	w := width(src[*src_pos])
+	switch w {
+	case 4:
+		dest[*dest_pos+3] = src[*src_pos+3]
+		fallthrough
+	case 3:
+		dest[*dest_pos+2] = src[*src_pos+2]
+		fallthrough
+	case 2:
+		dest[*dest_pos+1] = src[*src_pos+1]
+		fallthrough
+	case 1:
+		dest[*dest_pos] = src[*src_pos]
+	default:
+		panic("invalid width")
+	}
+	*dest_pos += w
+	*src_pos += w
+}
+
+// /*
+//  * Check if the character at the specified position is an alphabetical
+//  * character, a digit, '_', or '-'.
+//  */
+
+func is_alpha(b byte) bool {
+	return (b >= '0' && b <= '9') ||
+		(b >= 'A' && b <= 'Z') ||
+		(b >= 'a' && b <= 'z') ||
+		b == '_' || b == '-'
+}
+
+// /*
+//  * Check if the character at the specified position is a digit.
+//  */
+//
+func is_digit(b byte) bool {
+	return b >= '0' && b <= '9'
+}
+
+// /*
+//  * Get the value of a digit.
+//  */
+//
+func as_digit(b byte) int {
+	return int(b) - '0'
+}
+
+// /*
+//  * Check if the character at the specified position is a hex-digit.
+//  */
+//
+func is_hex(b byte) bool {
+	return (b >= '0' && b <= '9') ||
+		(b >= 'A' && b <= 'F') ||
+		(b >= 'a' && b <= 'f')
+}
+
+//
+// /*
+//  * Get the value of a hex-digit.
+//  */
+//
+func as_hex(b byte) int {
+	if b >= 'A' && b <= 'F' {
+		return int(b) - 'A' + 10
+	} else if b >= 'a' && b <= 'f' {
+		return int(b) - 'a' + 10
+	}
+	return int(b) - '0'
+}
+
+// #define AS_HEX_AT(string,offset)                                                \
+//       (((string).pointer[offset] >= (yaml_char_t) 'A' &&                        \
+//         (string).pointer[offset] <= (yaml_char_t) 'F') ?                        \
+//        ((string).pointer[offset] - (yaml_char_t) 'A' + 10) :                    \
+//        ((string).pointer[offset] >= (yaml_char_t) 'a' &&                        \
+//         (string).pointer[offset] <= (yaml_char_t) 'f') ?                        \
+//        ((string).pointer[offset] - (yaml_char_t) 'a' + 10) :                    \
+//        ((string).pointer[offset] - (yaml_char_t) '0'))
+
+// /*
+//  * Check if the character is a line break, space, tab, or NUL.
+//  */
+func is_blankz_at(b []byte, i int) bool {
+	return is_blank(b[i]) || is_breakz_at(b, i)
+}
+
+// /*
+//  * Check if the character at the specified position is a line break.
+//  */
+func is_break_at(b []byte, i int) bool {
+	return b[i] == '\r' || /* CR (#xD)*/
+		b[i] == '\n' || /* LF (#xA) */
+		(b[i] == 0xC2 && b[i+1] == 0x85) || /* NEL (#x85) */
+		(b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8) || /* LS (#x2028) */
+		(b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9) /* PS (#x2029) */
+}
+
+func is_breakz_at(b []byte, i int) bool {
+	return is_break_at(b, i) || is_z(b[i])
+}
+
+func is_crlf_at(b []byte, i int) bool {
+	return b[i] == '\r' && b[i+1] == '\n'
+}
+
+// /*
+//  * Check if the character at the specified position is NUL.
+//  */
+func is_z(b byte) bool {
+	return b == 0x0
+}
+
+// /*
+//  * Check if the character at the specified position is space.
+//  */
+func is_space(b byte) bool {
+	return b == ' '
+}
+
+//
+// /*
+//  * Check if the character at the specified position is tab.
+//  */
+func is_tab(b byte) bool {
+	return b == '\t'
+}
+
+// /*
+//  * Check if the character at the specified position is blank (space or tab).
+//  */
+func is_blank(b byte) bool {
+	return is_space(b) || is_tab(b)
+}
+
+// /*
+//  * Check if the character is ASCII.
+//  */
+func is_ascii(b byte) bool {
+	return b <= '\x7f'
+}
+
+// /*
+//  * Check if the character can be printed unescaped.
+//  */
+func is_printable_at(b []byte, i int) bool {
+	return ((b[i] == 0x0A) || /* . == #x0A */
+		(b[i] >= 0x20 && b[i] <= 0x7E) || /* #x20 <= . <= #x7E */
+		(b[i] == 0xC2 && b[i+1] >= 0xA0) || /* #0xA0 <= . <= #xD7FF */
+		(b[i] > 0xC2 && b[i] < 0xED) ||
+		(b[i] == 0xED && b[i+1] < 0xA0) ||
+		(b[i] == 0xEE) ||
+		(b[i] == 0xEF && /* && . != #xFEFF */
+			!(b[i+1] == 0xBB && b[i+2] == 0xBF) &&
+			!(b[i+1] == 0xBF && (b[i+2] == 0xBE || b[i+2] == 0xBF))))
+}
+
+func insert_token(parser *yaml_parser_t, pos int, token *yaml_token_t) {
+	// collapse the slice
+	if parser.tokens_head > 0 && len(parser.tokens) == cap(parser.tokens) {
+		if parser.tokens_head != len(parser.tokens) {
+			// move the tokens down
+			copy(parser.tokens, parser.tokens[parser.tokens_head:])
+		}
+		// readjust the length
+		parser.tokens = parser.tokens[:len(parser.tokens)-parser.tokens_head]
+		parser.tokens_head = 0
+	}
+
+	parser.tokens = append(parser.tokens, *token)
+	if pos < 0 {
+		return
+	}
+	copy(parser.tokens[parser.tokens_head+pos+1:], parser.tokens[parser.tokens_head+pos:])
+	parser.tokens[parser.tokens_head+pos] = *token
+}
+
+// /*
+//  * Check if the character at the specified position is BOM.
+//  */
+//
+func is_bom_at(b []byte, i int) bool {
+	return b[i] == 0xEF && b[i+1] == 0xBB && b[i+2] == 0xBF
+}
+
+//
+// #ifdef HAVE_CONFIG_H
+// #include <config.h>
+// #endif
+//
+// #include "./yaml.h"
+//
+// #include <assert.h>
+// #include <limits.h>
+//
+// /*
+//  * Memory management.
+//  */
+//
+// yaml_DECLARE(void *)
+// yaml_malloc(size_t size);
+//
+// yaml_DECLARE(void *)
+// yaml_realloc(void *ptr, size_t size);
+//
+// yaml_DECLARE(void)
+// yaml_free(void *ptr);
+//
+// yaml_DECLARE(yaml_char_t *)
+// yaml_strdup(const yaml_char_t *);
+//
+// /*
+//  * Reader: Ensure that the buffer contains at least `length` characters.
+//  */
+//
+// yaml_DECLARE(int)
+// yaml_parser_update_buffer(yaml_parser_t *parser, size_t length);
+//
+// /*
+//  * Scanner: Ensure that the token stack contains at least one token ready.
+//  */
+//
+// yaml_DECLARE(int)
+// yaml_parser_fetch_more_tokens(yaml_parser_t *parser);
+//
+// /*
+//  * The size of the input raw buffer.
+//  */
+//
+// #define INPUT_RAW_BUFFER_SIZE   16384
+//
+// /*
+//  * The size of the input buffer.
+//  *
+//  * It should be possible to decode the whole raw buffer.
+//  */
+//
+// #define INPUT_BUFFER_SIZE       (INPUT_RAW_BUFFER_SIZE*3)
+//
+// /*
+//  * The size of the output buffer.
+//  */
+//
+// #define OUTPUT_BUFFER_SIZE      16384
+//
+// /*
+//  * The size of the output raw buffer.
+//  *
+//  * It should be possible to encode the whole output buffer.
+//  */
+//
+// #define OUTPUT_RAW_BUFFER_SIZE  (OUTPUT_BUFFER_SIZE*2+2)
+//
+// /*
+//  * The size of other stacks and queues.
+//  */
+//
+// #define INITIAL_STACK_SIZE  16
+// #define INITIAL_QUEUE_SIZE  16
+// #define INITIAL_STRING_SIZE 16
+//
+// /*
+//  * Buffer management.
+//  */
+//
+// #define BUFFER_INIT(context,buffer,size)                                        \
+//     (((buffer).start = yaml_malloc(size)) ?                                     \
+//         ((buffer).last = (buffer).pointer = (buffer).start,                     \
+//          (buffer).end = (buffer).start+(size),                                  \
+//          1) :                                                                   \
+//         ((context)->error = yaml_MEMORY_ERROR,                                  \
+//          0))
+//
+// #define BUFFER_DEL(context,buffer)                                              \
+//     (yaml_free((buffer).start),                                                 \
+//      (buffer).start = (buffer).pointer = (buffer).end = 0)
+//
+// /*
+//  * String management.
+//  */
+//
+// typedef struct {
+//     yaml_char_t *start;
+//     yaml_char_t *end;
+//     yaml_char_t *pointer;
+// } yaml_string_t;
+//
+// yaml_DECLARE(int)
+// yaml_string_extend(yaml_char_t **start,
+//         yaml_char_t **pointer, yaml_char_t **end);
+//
+// yaml_DECLARE(int)
+// yaml_string_join(
+//         yaml_char_t **a_start, yaml_char_t **a_pointer, yaml_char_t **a_end,
+//         yaml_char_t **b_start, yaml_char_t **b_pointer, yaml_char_t **b_end);
+//
+// #define NULL_STRING { NULL, NULL, NULL }
+//
+// #define STRING(string,length)   { (string), (string)+(length), (string) }
+//
+// #define STRING_ASSIGN(value,string,length)                                      \
+//     ((value).start = (string),                                                  \
+//      (value).end = (string)+(length),                                           \
+//      (value).pointer = (string))
+//
+// #define STRING_INIT(context,string,size)                                        \
+//     (((string).start = yaml_malloc(size)) ?                                     \
+//         ((string).pointer = (string).start,                                     \
+//          (string).end = (string).start+(size),                                  \
+//          memset((string).start, 0, (size)),                                     \
+//          1) :                                                                   \
+//         ((context)->error = yaml_MEMORY_ERROR,                                  \
+//          0))
+//
+// #define STRING_DEL(context,string)                                              \
+//     (yaml_free((string).start),                                                 \
+//      (string).start = (string).pointer = (string).end = 0)
+//
+// #define STRING_EXTEND(context,string)                                           \
+//     (((string).pointer+5 < (string).end)                                        \
+//         || yaml_string_extend(&(string).start,                                  \
+//             &(string).pointer, &(string).end))
+//
+// #define CLEAR(context,string)                                                   \
+//     ((string).pointer = (string).start,                                         \
+//      memset((string).start, 0, (string).end-(string).start))
+//
+// #define JOIN(context,string_a,string_b)                                         \
+//     ((yaml_string_join(&(string_a).start, &(string_a).pointer,                  \
+//                        &(string_a).end, &(string_b).start,                      \
+//                        &(string_b).pointer, &(string_b).end)) ?                 \
+//         ((string_b).pointer = (string_b).start,                                 \
+//          1) :                                                                   \
+//         ((context)->error = yaml_MEMORY_ERROR,                                  \
+//          0))
+//
+// /*
+//  * String check operations.
+//  */
+//
+// /*
+//  * Check the octet at the specified position.
+//  */
+//
+// #define CHECK_AT(string,octet,offset)                                           \
+//     ((string).pointer[offset] == (yaml_char_t)(octet))
+//
+// /*
+//  * Check the current octet in the buffer.
+//  */
+//
+// #define CHECK(string,octet) CHECK_AT((string),(octet),0)
+//
+// /*
+//  * Check if the character at the specified position is an alphabetical
+//  * character, a digit, '_', or '-'.
+//  */
+//
+// #define IS_ALPHA_AT(string,offset)                                              \
+//      (((string).pointer[offset] >= (yaml_char_t) '0' &&                         \
+//        (string).pointer[offset] <= (yaml_char_t) '9') ||                        \
+//       ((string).pointer[offset] >= (yaml_char_t) 'A' &&                         \
+//        (string).pointer[offset] <= (yaml_char_t) 'Z') ||                        \
+//       ((string).pointer[offset] >= (yaml_char_t) 'a' &&                         \
+//        (string).pointer[offset] <= (yaml_char_t) 'z') ||                        \
+//       (string).pointer[offset] == '_' ||                                        \
+//       (string).pointer[offset] == '-')
+//
+// #define IS_ALPHA(string)    IS_ALPHA_AT((string),0)
+//
+// /*
+//  * Check if the character at the specified position is a digit.
+//  */
+//
+// #define IS_DIGIT_AT(string,offset)                                              \
+//      (((string).pointer[offset] >= (yaml_char_t) '0' &&                         \
+//        (string).pointer[offset] <= (yaml_char_t) '9'))
+//
+// #define IS_DIGIT(string)    IS_DIGIT_AT((string),0)
+//
+// /*
+//  * Get the value of a digit.
+//  */
+//
+// #define AS_DIGIT_AT(string,offset)                                              \
+//      ((string).pointer[offset] - (yaml_char_t) '0')
+//
+// #define AS_DIGIT(string)    AS_DIGIT_AT((string),0)
+//
+// /*
+//  * Check if the character at the specified position is a hex-digit.
+//  */
+//
+// #define IS_HEX_AT(string,offset)                                                \
+//      (((string).pointer[offset] >= (yaml_char_t) '0' &&                         \
+//        (string).pointer[offset] <= (yaml_char_t) '9') ||                        \
+//       ((string).pointer[offset] >= (yaml_char_t) 'A' &&                         \
+//        (string).pointer[offset] <= (yaml_char_t) 'F') ||                        \
+//       ((string).pointer[offset] >= (yaml_char_t) 'a' &&                         \
+//        (string).pointer[offset] <= (yaml_char_t) 'f'))
+//
+// #define IS_HEX(string)    IS_HEX_AT((string),0)
+//
+// /*
+//  * Get the value of a hex-digit.
+//  */
+//
+// #define AS_HEX_AT(string,offset)                                                \
+//       (((string).pointer[offset] >= (yaml_char_t) 'A' &&                        \
+//         (string).pointer[offset] <= (yaml_char_t) 'F') ?                        \
+//        ((string).pointer[offset] - (yaml_char_t) 'A' + 10) :                    \
+//        ((string).pointer[offset] >= (yaml_char_t) 'a' &&                        \
+//         (string).pointer[offset] <= (yaml_char_t) 'f') ?                        \
+//        ((string).pointer[offset] - (yaml_char_t) 'a' + 10) :                    \
+//        ((string).pointer[offset] - (yaml_char_t) '0'))
+//
+// #define AS_HEX(string)  AS_HEX_AT((string),0)
+//
+// /*
+//  * Check if the character is ASCII.
+//  */
+//
+// #define IS_ASCII_AT(string,offset)                                              \
+//     ((string).pointer[offset] <= (yaml_char_t) '\x7F')
+//
+// #define IS_ASCII(string)    IS_ASCII_AT((string),0)
+//
+// /*
+//  * Check if the character can be printed unescaped.
+//  */
+//
+// #define IS_PRINTABLE_AT(string,offset)                                          \
+//     (((string).pointer[offset] == 0x0A)         /* . == #x0A */                 \
+//      || ((string).pointer[offset] >= 0x20       /* #x20 <= . <= #x7E */         \
+//          && (string).pointer[offset] <= 0x7E)                                   \
+//      || ((string).pointer[offset] == 0xC2       /* #0xA0 <= . <= #xD7FF */      \
+//          && (string).pointer[offset+1] >= 0xA0)                                 \
+//      || ((string).pointer[offset] > 0xC2                                        \
+//          && (string).pointer[offset] < 0xED)                                    \
+//      || ((string).pointer[offset] == 0xED                                       \
+//          && (string).pointer[offset+1] < 0xA0)                                  \
+//      || ((string).pointer[offset] == 0xEE)                                      \
+//      || ((string).pointer[offset] == 0xEF      /* #xE000 <= . <= #xFFFD */      \
+//          && !((string).pointer[offset+1] == 0xBB        /* && . != #xFEFF */    \
+//              && (string).pointer[offset+2] == 0xBF)                             \
+//          && !((string).pointer[offset+1] == 0xBF                                \
+//              && ((string).pointer[offset+2] == 0xBE                             \
+//                  || (string).pointer[offset+2] == 0xBF))))
+//
+// #define IS_PRINTABLE(string)    IS_PRINTABLE_AT((string),0)
+//
+// /*
+//  * Check if the character at the specified position is NUL.
+//  */
+//
+// #define IS_Z_AT(string,offset)    CHECK_AT((string),'\0',(offset))
+//
+// #define IS_Z(string)    IS_Z_AT((string),0)
+//
+// /*
+//  * Check if the character at the specified position is BOM.
+//  */
+//
+// #define IS_BOM_AT(string,offset)                                                \
+//      (CHECK_AT((string),'\xEF',(offset))                                        \
+//       && CHECK_AT((string),'\xBB',(offset)+1)                                   \
+//       && CHECK_AT((string),'\xBF',(offset)+2))  /* BOM (#xFEFF) */
+//
+// #define IS_BOM(string)  IS_BOM_AT(string,0)
+//
+// /*
+//  * Check if the character at the specified position is space.
+//  */
+//
+// #define IS_SPACE_AT(string,offset)  CHECK_AT((string),' ',(offset))
+//
+// #define IS_SPACE(string)    IS_SPACE_AT((string),0)
+//
+// /*
+//  * Check if the character at the specified position is tab.
+//  */
+//
+// #define IS_TAB_AT(string,offset)    CHECK_AT((string),'\t',(offset))
+//
+// #define IS_TAB(string)  IS_TAB_AT((string),0)
+//
+// /*
+//  * Check if the character at the specified position is blank (space or tab).
+//  */
+//
+// #define IS_BLANK_AT(string,offset)                                              \
+//     (IS_SPACE_AT((string),(offset)) || IS_TAB_AT((string),(offset)))
+//
+// #define IS_BLANK(string)    IS_BLANK_AT((string),0)
+//
+// /*
+//  * Check if the character at the specified position is a line break.
+//  */
+//
+// #define IS_BREAK_AT(string,offset)                                              \
+//     (CHECK_AT((string),'\r',(offset))               /* CR (#xD)*/               \
+//      || CHECK_AT((string),'\n',(offset))            /* LF (#xA) */              \
+//      || (CHECK_AT((string),'\xC2',(offset))                                     \
+//          && CHECK_AT((string),'\x85',(offset)+1))   /* NEL (#x85) */            \
+//      || (CHECK_AT((string),'\xE2',(offset))                                     \
+//          && CHECK_AT((string),'\x80',(offset)+1)                                \
+//          && CHECK_AT((string),'\xA8',(offset)+2))   /* LS (#x2028) */           \
+//      || (CHECK_AT((string),'\xE2',(offset))                                     \
+//          && CHECK_AT((string),'\x80',(offset)+1)                                \
+//          && CHECK_AT((string),'\xA9',(offset)+2)))  /* PS (#x2029) */
+//
+// #define IS_BREAK(string)    IS_BREAK_AT((string),0)
+//
+// #define IS_CRLF_AT(string,offset)                                               \
+//      (CHECK_AT((string),'\r',(offset)) && CHECK_AT((string),'\n',(offset)+1))
+//
+// #define IS_CRLF(string) IS_CRLF_AT((string),0)
+//
+// /*
+//  * Check if the character is a line break or NUL.
+//  */
+//
+// #define IS_BREAKZ_AT(string,offset)                                             \
+//     (IS_BREAK_AT((string),(offset)) || IS_Z_AT((string),(offset)))
+//
+// #define IS_BREAKZ(string)   IS_BREAKZ_AT((string),0)
+//
+// /*
+//  * Check if the character is a line break, space, or NUL.
+//  */
+//
+// #define IS_SPACEZ_AT(string,offset)                                             \
+//     (IS_SPACE_AT((string),(offset)) || IS_BREAKZ_AT((string),(offset)))
+//
+// #define IS_SPACEZ(string)   IS_SPACEZ_AT((string),0)
+//
+// /*
+//  * Check if the character is a line break, space, tab, or NUL.
+//  */
+//
+// #define IS_BLANKZ_AT(string,offset)                                             \
+//     (IS_BLANK_AT((string),(offset)) || IS_BREAKZ_AT((string),(offset)))
+//
+// #define IS_BLANKZ(string)   IS_BLANKZ_AT((string),0)
+//
+// /*
+//  * Determine the width of the character.
+//  */
+//
+// #define WIDTH_AT(string,offset)                                                 \
+//      (((string).pointer[offset] & 0x80) == 0x00 ? 1 :                           \
+//       ((string).pointer[offset] & 0xE0) == 0xC0 ? 2 :                           \
+//       ((string).pointer[offset] & 0xF0) == 0xE0 ? 3 :                           \
+//       ((string).pointer[offset] & 0xF8) == 0xF0 ? 4 : 0)
+//
+// #define WIDTH(string)   WIDTH_AT((string),0)
+//
+// /*
+//  * Move the string pointer to the next character.
+//  */
+//
+// #define MOVE(string)    ((string).pointer += WIDTH((string)))
+//
+// /*
+//  * Copy a character and move the pointers of both strings.
+//  */
+//
+// #define COPY(string_a,string_b)                                                 \
+//     ((*(string_b).pointer & 0x80) == 0x00 ?                                     \
+//      (*((string_a).pointer++) = *((string_b).pointer++)) :                      \
+//      (*(string_b).pointer & 0xE0) == 0xC0 ?                                     \
+//      (*((string_a).pointer++) = *((string_b).pointer++),                        \
+//       *((string_a).pointer++) = *((string_b).pointer++)) :                      \
+//      (*(string_b).pointer & 0xF0) == 0xE0 ?                                     \
+//      (*((string_a).pointer++) = *((string_b).pointer++),                        \
+//       *((string_a).pointer++) = *((string_b).pointer++),                        \
+//       *((string_a).pointer++) = *((string_b).pointer++)) :                      \
+//      (*(string_b).pointer & 0xF8) == 0xF0 ?                                     \
+//      (*((string_a).pointer++) = *((string_b).pointer++),                        \
+//       *((string_a).pointer++) = *((string_b).pointer++),                        \
+//       *((string_a).pointer++) = *((string_b).pointer++),                        \
+//       *((string_a).pointer++) = *((string_b).pointer++)) : 0)
+//
+// /*
+//  * Stack and queue management.
+//  */
+//
+// yaml_DECLARE(int)
+// yaml_stack_extend(void **start, void **top, void **end);
+//
+// yaml_DECLARE(int)
+// yaml_queue_extend(void **start, void **head, void **tail, void **end);
+//
+// #define STACK_INIT(context,stack,size)                                          \
+//     (((stack).start = yaml_malloc((size)*sizeof(*(stack).start))) ?             \
+//         ((stack).top = (stack).start,                                           \
+//          (stack).end = (stack).start+(size),                                    \
+//          1) :                                                                   \
+//         ((context)->error = yaml_MEMORY_ERROR,                                  \
+//          0))
+//
+// #define STACK_DEL(context,stack)                                                \
+//     (yaml_free((stack).start),                                                  \
+//      (stack).start = (stack).top = (stack).end = 0)
+//
+// #define STACK_EMPTY(context,stack)                                              \
+//     ((stack).start == (stack).top)
+//
+// #define PUSH(context,stack,value)                                               \
+//     (((stack).top != (stack).end                                                \
+//       || yaml_stack_extend((void **)&(stack).start,                             \
+//               (void **)&(stack).top, (void **)&(stack).end)) ?                  \
+//         (*((stack).top++) = value,                                              \
+//          1) :                                                                   \
+//         ((context)->error = yaml_MEMORY_ERROR,                                  \
+//          0))
+//
+// #define POP(context,stack)                                                      \
+//     (*(--(stack).top))
+//
+// #define QUEUE_INIT(context,queue,size)                                          \
+//     (((queue).start = yaml_malloc((size)*sizeof(*(queue).start))) ?             \
+//         ((queue).head = (queue).tail = (queue).start,                           \
+//          (queue).end = (queue).start+(size),                                    \
+//          1) :                                                                   \
+//         ((context)->error = yaml_MEMORY_ERROR,                                  \
+//          0))
+//
+// #define QUEUE_DEL(context,queue)                                                \
+//     (yaml_free((queue).start),                                                  \
+//      (queue).start = (queue).head = (queue).tail = (queue).end = 0)
+//
+// #define QUEUE_EMPTY(context,queue)                                              \
+//     ((queue).head == (queue).tail)
+//
+// #define ENQUEUE(context,queue,value)                                            \
+//     (((queue).tail != (queue).end                                               \
+//       || yaml_queue_extend((void **)&(queue).start, (void **)&(queue).head,     \
+//             (void **)&(queue).tail, (void **)&(queue).end)) ?                   \
+//         (*((queue).tail++) = value,                                             \
+//          1) :                                                                   \
+//         ((context)->error = yaml_MEMORY_ERROR,                                  \
+//          0))
+//
+// #define DEQUEUE(context,queue)                                                  \
+//     (*((queue).head++))
+//
+// #define QUEUE_INSERT(context,queue,index,value)                                 \
+//     (((queue).tail != (queue).end                                               \
+//       || yaml_queue_extend((void **)&(queue).start, (void **)&(queue).head,     \
+//             (void **)&(queue).tail, (void **)&(queue).end)) ?                   \
+//         (memmove((queue).head+(index)+1,(queue).head+(index),                   \
+//             ((queue).tail-(queue).head-(index))*sizeof(*(queue).start)),        \
+//          *((queue).head+(index)) = value,                                       \
+//          (queue).tail++,                                                        \
+//          1) :                                                                   \
+//         ((context)->error = yaml_MEMORY_ERROR,                                  \
+//          0))
+//
+// /*
+//  * Token initializers.
+//  */
+//
+// #define TOKEN_INIT(token,token_type,token_start_mark,token_end_mark)            \
+//     (memset(&(token), 0, sizeof(yaml_token_t)),                                 \
+//      (token).type = (token_type),                                               \
+//      (token).start_mark = (token_start_mark),                                   \
+//      (token).end_mark = (token_end_mark))
+//
+// #define STREAM_START_TOKEN_INIT(token,token_encoding,start_mark,end_mark)       \
+//     (TOKEN_INIT((token),yaml_STREAM_START_TOKEN,(start_mark),(end_mark)),       \
+//      (token).data.stream_start.encoding = (token_encoding))
+//
+// #define STREAM_END_TOKEN_INIT(token,start_mark,end_mark)                        \
+//     (TOKEN_INIT((token),yaml_STREAM_END_TOKEN,(start_mark),(end_mark)))
+//
+// #define ALIAS_TOKEN_INIT(token,token_value,start_mark,end_mark)                 \
+//     (TOKEN_INIT((token),yaml_ALIAS_TOKEN,(start_mark),(end_mark)),              \
+//      (token).data.alias.value = (token_value))
+//
+// #define ANCHOR_TOKEN_INIT(token,token_value,start_mark,end_mark)                \
+//     (TOKEN_INIT((token),yaml_ANCHOR_TOKEN,(start_mark),(end_mark)),             \
+//      (token).data.anchor.value = (token_value))
+//
+// #define TAG_TOKEN_INIT(token,token_handle,token_suffix,start_mark,end_mark)     \
+//     (TOKEN_INIT((token),yaml_TAG_TOKEN,(start_mark),(end_mark)),                \
+//      (token).data.tag.handle = (token_handle),                                  \
+//      (token).data.tag.suffix = (token_suffix))
+//
+// #define SCALAR_TOKEN_INIT(token,token_value,token_length,token_style,start_mark,end_mark)   \
+//     (TOKEN_INIT((token),yaml_SCALAR_TOKEN,(start_mark),(end_mark)),             \
+//      (token).data.scalar.value = (token_value),                                 \
+//      (token).data.scalar.length = (token_length),                               \
+//      (token).data.scalar.style = (token_style))
+//
+// #define VERSION_DIRECTIVE_TOKEN_INIT(token,token_major,token_minor,start_mark,end_mark)     \
+//     (TOKEN_INIT((token),yaml_VERSION_DIRECTIVE_TOKEN,(start_mark),(end_mark)),  \
+//      (token).data.version_directive.major = (token_major),                      \
+//      (token).data.version_directive.minor = (token_minor))
+//
+// #define TAG_DIRECTIVE_TOKEN_INIT(token,token_handle,token_prefix,start_mark,end_mark)       \
+//     (TOKEN_INIT((token),yaml_TAG_DIRECTIVE_TOKEN,(start_mark),(end_mark)),      \
+//      (token).data.tag_directive.handle = (token_handle),                        \
+//      (token).data.tag_directive.prefix = (token_prefix))
+//
+// /*
+//  * Event initializers.
+//  */
+//
+// #define EVENT_INIT(event,event_type,event_start_mark,event_end_mark)            \
+//     (memset(&(event), 0, sizeof(yaml_event_t)),                                 \
+//      (event).type = (event_type),                                               \
+//      (event).start_mark = (event_start_mark),                                   \
+//      (event).end_mark = (event_end_mark))
+//
+// #define STREAM_START_EVENT_INIT(event,event_encoding,start_mark,end_mark)       \
+//     (EVENT_INIT((event),yaml_STREAM_START_EVENT,(start_mark),(end_mark)),       \
+//      (event).data.stream_start.encoding = (event_encoding))
+//
+// #define STREAM_END_EVENT_INIT(event,start_mark,end_mark)                        \
+//     (EVENT_INIT((event),yaml_STREAM_END_EVENT,(start_mark),(end_mark)))
+//
+// #define DOCUMENT_START_EVENT_INIT(event,event_version_directive,                \
+//         event_tag_directives_start,event_tag_directives_end,event_implicit,start_mark,end_mark) \
+//     (EVENT_INIT((event),yaml_DOCUMENT_START_EVENT,(start_mark),(end_mark)),     \
+//      (event).data.document_start.version_directive = (event_version_directive), \
+//      (event).data.document_start.tag_directives.start = (event_tag_directives_start),   \
+//      (event).data.document_start.tag_directives.end = (event_tag_directives_end),   \
+//      (event).data.document_start.implicit = (event_implicit))
+//
+// #define DOCUMENT_END_EVENT_INIT(event,event_implicit,start_mark,end_mark)       \
+//     (EVENT_INIT((event),yaml_DOCUMENT_END_EVENT,(start_mark),(end_mark)),       \
+//      (event).data.document_end.implicit = (event_implicit))
+//
+// #define ALIAS_EVENT_INIT(event,event_anchor,start_mark,end_mark)                \
+//     (EVENT_INIT((event),yaml_ALIAS_EVENT,(start_mark),(end_mark)),              \
+//      (event).data.alias.anchor = (event_anchor))
+//
+// #define SCALAR_EVENT_INIT(event,event_anchor,event_tag,event_value,event_length,    \
+//         event_plain_implicit, event_quoted_implicit,event_style,start_mark,end_mark)    \
+//     (EVENT_INIT((event),yaml_SCALAR_EVENT,(start_mark),(end_mark)),             \
+//      (event).data.scalar.anchor = (event_anchor),                               \
+//      (event).data.scalar.tag = (event_tag),                                     \
+//      (event).data.scalar.value = (event_value),                                 \
+//      (event).data.scalar.length = (event_length),                               \
+//      (event).data.scalar.plain_implicit = (event_plain_implicit),               \
+//      (event).data.scalar.quoted_implicit = (event_quoted_implicit),             \
+//      (event).data.scalar.style = (event_style))
+//
+// #define SEQUENCE_START_EVENT_INIT(event,event_anchor,event_tag,                 \
+//         event_implicit,event_style,start_mark,end_mark)                         \
+//     (EVENT_INIT((event),yaml_SEQUENCE_START_EVENT,(start_mark),(end_mark)),     \
+//      (event).data.sequence_start.anchor = (event_anchor),                       \
+//      (event).data.sequence_start.tag = (event_tag),                             \
+//      (event).data.sequence_start.implicit = (event_implicit),                   \
+//      (event).data.sequence_start.style = (event_style))
+//
+// #define SEQUENCE_END_EVENT_INIT(event,start_mark,end_mark)                      \
+//     (EVENT_INIT((event),yaml_SEQUENCE_END_EVENT,(start_mark),(end_mark)))
+//
+// #define MAPPING_START_EVENT_INIT(event,event_anchor,event_tag,                  \
+//         event_implicit,event_style,start_mark,end_mark)                         \
+//     (EVENT_INIT((event),yaml_MAPPING_START_EVENT,(start_mark),(end_mark)),      \
+//      (event).data.mapping_start.anchor = (event_anchor),                        \
+//      (event).data.mapping_start.tag = (event_tag),                              \
+//      (event).data.mapping_start.implicit = (event_implicit),                    \
+//      (event).data.mapping_start.style = (event_style))
+//
+// #define MAPPING_END_EVENT_INIT(event,start_mark,end_mark)                       \
+//     (EVENT_INIT((event),yaml_MAPPING_END_EVENT,(start_mark),(end_mark)))
+//
+// /*
+//  * Document initializer.
+//  */
+//
+// #define DOCUMENT_INIT(document,document_nodes_start,document_nodes_end,         \
+//         document_version_directive,document_tag_directives_start,               \
+//         document_tag_directives_end,document_start_implicit,                    \
+//         document_end_implicit,document_start_mark,document_end_mark)            \
+//     (memset(&(document), 0, sizeof(yaml_document_t)),                           \
+//      (document).nodes.start = (document_nodes_start),                           \
+//      (document).nodes.end = (document_nodes_end),                               \
+//      (document).nodes.top = (document_nodes_start),                             \
+//      (document).version_directive = (document_version_directive),               \
+//      (document).tag_directives.start = (document_tag_directives_start),         \
+//      (document).tag_directives.end = (document_tag_directives_end),             \
+//      (document).start_implicit = (document_start_implicit),                     \
+//      (document).end_implicit = (document_end_implicit),                         \
+//      (document).start_mark = (document_start_mark),                             \
+//      (document).end_mark = (document_end_mark))
+//
+// /*
+//  * Node initializers.
+//  */
+//
+// #define NODE_INIT(node,node_type,node_tag,node_start_mark,node_end_mark)        \
+//     (memset(&(node), 0, sizeof(yaml_node_t)),                                   \
+//      (node).type = (node_type),                                                 \
+//      (node).tag = (node_tag),                                                   \
+//      (node).start_mark = (node_start_mark),                                     \
+//      (node).end_mark = (node_end_mark))
+//
+// #define SCALAR_NODE_INIT(node,node_tag,node_value,node_length,                  \
+//         node_style,start_mark,end_mark)                                         \
+//     (NODE_INIT((node),yaml_SCALAR_NODE,(node_tag),(start_mark),(end_mark)),     \
+//      (node).data.scalar.value = (node_value),                                   \
+//      (node).data.scalar.length = (node_length),                                 \
+//      (node).data.scalar.style = (node_style))
+//
+// #define SEQUENCE_NODE_INIT(node,node_tag,node_items_start,node_items_end,       \
+//         node_style,start_mark,end_mark)                                         \
+//     (NODE_INIT((node),yaml_SEQUENCE_NODE,(node_tag),(start_mark),(end_mark)),   \
+//      (node).data.sequence.items.start = (node_items_start),                     \
+//      (node).data.sequence.items.end = (node_items_end),                         \
+//      (node).data.sequence.items.top = (node_items_start),                       \
+//      (node).data.sequence.style = (node_style))
+//
+// #define MAPPING_NODE_INIT(node,node_tag,node_pairs_start,node_pairs_end,        \
+//         node_style,start_mark,end_mark)                                         \
+//     (NODE_INIT((node),yaml_MAPPING_NODE,(node_tag),(start_mark),(end_mark)),    \
+//      (node).data.mapping.pairs.start = (node_pairs_start),                      \
+//      (node).data.mapping.pairs.end = (node_pairs_end),                          \
+//      (node).data.mapping.pairs.top = (node_pairs_start),                        \
+//      (node).data.mapping.style = (node_style))
+//

vendor/github.com/cloudfoundry-incubator/candiedyaml/yamlh.go

@@ -0,0 +1,953 @@
+/*
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package candiedyaml
+
+import (
+	"fmt"
+	"io"
+)
+
+/** The version directive data. */
+type yaml_version_directive_t struct {
+	major int // The major version number
+	minor int // The minor version number
+}
+
+/** The tag directive data. */
+type yaml_tag_directive_t struct {
+	handle []byte // The tag handle
+	prefix []byte // The tag prefix
+}
+
+/** The stream encoding. */
+type yaml_encoding_t int
+
+const (
+	/** Let the parser choose the encoding. */
+	yaml_ANY_ENCODING yaml_encoding_t = iota
+	/** The defau lt UTF-8 encoding. */
+	yaml_UTF8_ENCODING
+	/** The UTF-16-LE encoding with BOM. */
+	yaml_UTF16LE_ENCODING
+	/** The UTF-16-BE encoding with BOM. */
+	yaml_UTF16BE_ENCODING
+)
+
+/** Line break types. */
+type yaml_break_t int
+
+const (
+	yaml_ANY_BREAK  yaml_break_t = iota /** Let the parser choose the break type. */
+	yaml_CR_BREAK                       /** Use CR for line breaks (Mac style). */
+	yaml_LN_BREAK                       /** Use LN for line breaks (Unix style). */
+	yaml_CRLN_BREAK                     /** Use CR LN for line breaks (DOS style). */
+)
+
+/** Many bad things could happen with the parser and emitter. */
+type YAML_error_type_t int
+
+const (
+	/** No error is produced. */
+	yaml_NO_ERROR YAML_error_type_t = iota
+
+	/** Cannot allocate or reallocate a block of memory. */
+	yaml_MEMORY_ERROR
+
+	/** Cannot read or decode the input stream. */
+	yaml_READER_ERROR
+	/** Cannot scan the input stream. */
+	yaml_SCANNER_ERROR
+	/** Cannot parse the input stream. */
+	yaml_PARSER_ERROR
+	/** Cannot compose a YAML document. */
+	yaml_COMPOSER_ERROR
+
+	/** Cannot write to the output stream. */
+	yaml_WRITER_ERROR
+	/** Cannot emit a YAML stream. */
+	yaml_EMITTER_ERROR
+)
+
+/** The pointer position. */
+type YAML_mark_t struct {
+	/** The position index. */
+	index int
+
+	/** The position line. */
+	line int
+
+	/** The position column. */
+	column int
+}
+
+func (m YAML_mark_t) String() string {
+	return fmt.Sprintf("line %d, column %d", m.line, m.column)
+}
+
+/** @} */
+
+/**
+ * @defgroup styles Node Styles
+ * @{
+ */
+
+type yaml_style_t int
+
+/** Scalar styles. */
+type yaml_scalar_style_t yaml_style_t
+
+const (
+	/** Let the emitter choose the style. */
+	yaml_ANY_SCALAR_STYLE yaml_scalar_style_t = iota
+
+	/** The plain scalar style. */
+	yaml_PLAIN_SCALAR_STYLE
+
+	/** The single-quoted scalar style. */
+	yaml_SINGLE_QUOTED_SCALAR_STYLE
+	/** The double-quoted scalar style. */
+	yaml_DOUBLE_QUOTED_SCALAR_STYLE
+
+	/** The literal scalar style. */
+	yaml_LITERAL_SCALAR_STYLE
+	/** The folded scalar style. */
+	yaml_FOLDED_SCALAR_STYLE
+)
+
+/** Sequence styles. */
+type yaml_sequence_style_t yaml_style_t
+
+const (
+	/** Let the emitter choose the style. */
+	yaml_ANY_SEQUENCE_STYLE yaml_sequence_style_t = iota
+
+	/** The block sequence style. */
+	yaml_BLOCK_SEQUENCE_STYLE
+	/** The flow sequence style. */
+	yaml_FLOW_SEQUENCE_STYLE
+)
+
+/** Mapping styles. */
+type yaml_mapping_style_t yaml_style_t
+
+const (
+	/** Let the emitter choose the style. */
+	yaml_ANY_MAPPING_STYLE yaml_mapping_style_t = iota
+
+	/** The block mapping style. */
+	yaml_BLOCK_MAPPING_STYLE
+	/** The flow mapping style. */
+	yaml_FLOW_MAPPING_STYLE
+
+/*    yaml_FLOW_SET_MAPPING_STYLE   */
+)
+
+/** @} */
+
+/**
+ * @defgroup tokens Tokens
+ * @{
+ */
+
+/** Token types. */
+type yaml_token_type_t int
+
+const (
+	/** An empty token. */
+	yaml_NO_TOKEN yaml_token_type_t = iota
+
+	/** A STREAM-START token. */
+	yaml_STREAM_START_TOKEN
+	/** A STREAM-END token. */
+	yaml_STREAM_END_TOKEN
+
+	/** A VERSION-DIRECTIVE token. */
+	yaml_VERSION_DIRECTIVE_TOKEN
+	/** A TAG-DIRECTIVE token. */
+	yaml_TAG_DIRECTIVE_TOKEN
+	/** A DOCUMENT-START token. */
+	yaml_DOCUMENT_START_TOKEN
+	/** A DOCUMENT-END token. */
+	yaml_DOCUMENT_END_TOKEN
+
+	/** A BLOCK-SEQUENCE-START token. */
+	yaml_BLOCK_SEQUENCE_START_TOKEN
+	/** A BLOCK-SEQUENCE-END token. */
+	yaml_BLOCK_MAPPING_START_TOKEN
+	/** A BLOCK-END token. */
+	yaml_BLOCK_END_TOKEN
+
+	/** A FLOW-SEQUENCE-START token. */
+	yaml_FLOW_SEQUENCE_START_TOKEN
+	/** A FLOW-SEQUENCE-END token. */
+	yaml_FLOW_SEQUENCE_END_TOKEN
+	/** A FLOW-MAPPING-START token. */
+	yaml_FLOW_MAPPING_START_TOKEN
+	/** A FLOW-MAPPING-END token. */
+	yaml_FLOW_MAPPING_END_TOKEN
+
+	/** A BLOCK-ENTRY token. */
+	yaml_BLOCK_ENTRY_TOKEN
+	/** A FLOW-ENTRY token. */
+	yaml_FLOW_ENTRY_TOKEN
+	/** A KEY token. */
+	yaml_KEY_TOKEN
+	/** A VALUE token. */
+	yaml_VALUE_TOKEN
+
+	/** An ALIAS token. */
+	yaml_ALIAS_TOKEN
+	/** An ANCHOR token. */
+	yaml_ANCHOR_TOKEN
+	/** A TAG token. */
+	yaml_TAG_TOKEN
+	/** A SCALAR token. */
+	yaml_SCALAR_TOKEN
+)
+
+/** The token structure. */
+type yaml_token_t struct {
+
+	/** The token type. */
+	token_type yaml_token_type_t
+
+	/** The token data. */
+	/** The stream start (for @c yaml_STREAM_START_TOKEN). */
+	encoding yaml_encoding_t
+
+	/** The alias (for @c yaml_ALIAS_TOKEN, yaml_ANCHOR_TOKEN, yaml_SCALAR_TOKEN,yaml_TAG_TOKEN ). */
+	/** The anchor (for @c ). */
+	/** The scalar value (for @c ). */
+	value []byte
+
+	/** The tag suffix. */
+	suffix []byte
+
+	/** The scalar value (for @c yaml_SCALAR_TOKEN). */
+	/** The scalar style. */
+	style yaml_scalar_style_t
+
+	/** The version directive (for @c yaml_VERSION_DIRECTIVE_TOKEN). */
+	version_directive yaml_version_directive_t
+
+	/** The tag directive (for @c yaml_TAG_DIRECTIVE_TOKEN). */
+	prefix []byte
+
+	/** The beginning of the token. */
+	start_mark YAML_mark_t
+	/** The end of the token. */
+	end_mark YAML_mark_t
+
+	major, minor int
+}
+
+/**
+ * @defgroup events Events
+ * @{
+ */
+
+/** Event types. */
+type yaml_event_type_t int
+
+const (
+	/** An empty event. */
+	yaml_NO_EVENT yaml_event_type_t = iota
+
+	/** A STREAM-START event. */
+	yaml_STREAM_START_EVENT
+	/** A STREAM-END event. */
+	yaml_STREAM_END_EVENT
+
+	/** A DOCUMENT-START event. */
+	yaml_DOCUMENT_START_EVENT
+	/** A DOCUMENT-END event. */
+	yaml_DOCUMENT_END_EVENT
+
+	/** An ALIAS event. */
+	yaml_ALIAS_EVENT
+	/** A SCALAR event. */
+	yaml_SCALAR_EVENT
+
+	/** A SEQUENCE-START event. */
+	yaml_SEQUENCE_START_EVENT
+	/** A SEQUENCE-END event. */
+	yaml_SEQUENCE_END_EVENT
+
+	/** A MAPPING-START event. */
+	yaml_MAPPING_START_EVENT
+	/** A MAPPING-END event. */
+	yaml_MAPPING_END_EVENT
+)
+
+/** The event structure. */
+type yaml_event_t struct {
+
+	/** The event type. */
+	event_type yaml_event_type_t
+
+	/** The stream parameters (for @c yaml_STREAM_START_EVENT). */
+	encoding yaml_encoding_t
+
+	/** The document parameters (for @c yaml_DOCUMENT_START_EVENT). */
+	version_directive *yaml_version_directive_t
+
+	/** The beginning and end of the tag directives list. */
+	tag_directives []yaml_tag_directive_t
+
+	/** The document parameters (for @c yaml_DOCUMENT_START_EVENT, yaml_DOCUMENT_END_EVENT, yaml_SEQUENCE_START_EVENT,yaml_MAPPING_START_EVENT). */
+	/** Is the document indicator implicit? */
+	implicit bool
+
+	/** The alias parameters (for @c yaml_ALIAS_EVENT,yaml_SCALAR_EVENT, yaml_SEQUENCE_START_EVENT, yaml_MAPPING_START_EVENT). */
+	/** The anchor. */
+	anchor []byte
+
+	/** The scalar parameters (for @c yaml_SCALAR_EVENT,yaml_SEQUENCE_START_EVENT, yaml_MAPPING_START_EVENT). */
+	/** The tag. */
+	tag []byte
+	/** The scalar value. */
+	value []byte
+
+	/** Is the tag optional for the plain style? */
+	plain_implicit bool
+	/** Is the tag optional for any non-plain style? */
+	quoted_implicit bool
+
+	/** The sequence parameters (for @c yaml_SEQUENCE_START_EVENT, yaml_MAPPING_START_EVENT). */
+	/** The sequence style. */
+	/** The scalar style. */
+	style yaml_style_t
+
+	/** The beginning of the event. */
+	start_mark, end_mark YAML_mark_t
+}
+
+/**
+ * @defgroup nodes Nodes
+ * @{
+ */
+
+const (
+	/** The tag @c !!null with the only possible value: @c null. */
+	yaml_NULL_TAG = "tag:yaml.org,2002:null"
+	/** The tag @c !!bool with the values: @c true and @c falce. */
+	yaml_BOOL_TAG = "tag:yaml.org,2002:bool"
+	/** The tag @c !!str for string values. */
+	yaml_STR_TAG = "tag:yaml.org,2002:str"
+	/** The tag @c !!int for integer values. */
+	yaml_INT_TAG = "tag:yaml.org,2002:int"
+	/** The tag @c !!float for float values. */
+	yaml_FLOAT_TAG = "tag:yaml.org,2002:float"
+	/** The tag @c !!timestamp for date and time values. */
+	yaml_TIMESTAMP_TAG = "tag:yaml.org,2002:timestamp"
+
+	/** The tag @c !!seq is used to denote sequences. */
+	yaml_SEQ_TAG = "tag:yaml.org,2002:seq"
+	/** The tag @c !!map is used to denote mapping. */
+	yaml_MAP_TAG = "tag:yaml.org,2002:map"
+
+	/** The default scalar tag is @c !!str. */
+	yaml_DEFAULT_SCALAR_TAG = yaml_STR_TAG
+	/** The default sequence tag is @c !!seq. */
+	yaml_DEFAULT_SEQUENCE_TAG = yaml_SEQ_TAG
+	/** The default mapping tag is @c !!map. */
+	yaml_DEFAULT_MAPPING_TAG = yaml_MAP_TAG
+
+	yaml_BINARY_TAG = "tag:yaml.org,2002:binary"
+)
+
+/** Node types. */
+type yaml_node_type_t int
+
+const (
+	/** An empty node. */
+	yaml_NO_NODE yaml_node_type_t = iota
+
+	/** A scalar node. */
+	yaml_SCALAR_NODE
+	/** A sequence node. */
+	yaml_SEQUENCE_NODE
+	/** A mapping node. */
+	yaml_MAPPING_NODE
+)
+
+/** An element of a sequence node. */
+type yaml_node_item_t int
+
+/** An element of a mapping node. */
+type yaml_node_pair_t struct {
+	/** The key of the element. */
+	key int
+	/** The value of the element. */
+	value int
+}
+
+/** The node structure. */
+type yaml_node_t struct {
+
+	/** The node type. */
+	node_type yaml_node_type_t
+
+	/** The node tag. */
+	tag []byte
+
+	/** The scalar parameters (for @c yaml_SCALAR_NODE). */
+	scalar struct {
+		/** The scalar value. */
+		value []byte
+		/** The scalar style. */
+		style yaml_scalar_style_t
+	}
+
+	/** The sequence parameters (for @c yaml_SEQUENCE_NODE). */
+	sequence struct {
+		/** The stack of sequence items. */
+		items []yaml_node_item_t
+		/** The sequence style. */
+		style yaml_sequence_style_t
+	}
+
+	/** The mapping parameters (for @c yaml_MAPPING_NODE). */
+	mapping struct {
+		/** The stack of mapping pairs (key, value). */
+		pairs []yaml_node_pair_t
+		/** The mapping style. */
+		style yaml_mapping_style_t
+	}
+
+	/** The beginning of the node. */
+	start_mark YAML_mark_t
+	/** The end of the node. */
+	end_mark YAML_mark_t
+}
+
+/** The document structure. */
+type yaml_document_t struct {
+
+	/** The document nodes. */
+	nodes []yaml_node_t
+
+	/** The version directive. */
+	version_directive *yaml_version_directive_t
+
+	/** The list of tag directives. */
+	tags []yaml_tag_directive_t
+
+	/** Is the document start indicator implicit? */
+	start_implicit bool
+	/** Is the document end indicator implicit? */
+	end_implicit bool
+
+	/** The beginning of the document. */
+	start_mark YAML_mark_t
+	/** The end of the document. */
+	end_mark YAML_mark_t
+}
+
+/**
+ * The prototype of a read handler.
+ *
+ * The read handler is called when the parser needs to read more bytes from the
+ * source.  The handler should write not more than @a size bytes to the @a
+ * buffer.  The number of written bytes should be set to the @a length variable.
+ *
+ * @param[in,out]   data        A pointer to an application data specified by
+ *                              yaml_parser_set_input().
+ * @param[out]      buffer      The buffer to write the data from the source.
+ * @param[in]       size        The size of the buffer.
+ * @param[out]      size_read   The actual number of bytes read from the source.
+ *
+ * @returns On success, the handler should return @c 1.  If the handler failed,
+ * the returned value should be @c 0.  On EOF, the handler should set the
+ * @a size_read to @c 0 and return @c 1.
+ */
+
+type yaml_read_handler_t func(parser *yaml_parser_t, buffer []byte) (n int, err error)
+
+/**
+ * This structure holds information about a potential simple key.
+ */
+
+type yaml_simple_key_t struct {
+	/** Is a simple key possible? */
+	possible bool
+
+	/** Is a simple key required? */
+	required bool
+
+	/** The number of the token. */
+	token_number int
+
+	/** The position mark. */
+	mark YAML_mark_t
+}
+
+/**
+ * The states of the parser.
+ */
+type yaml_parser_state_t int
+
+const (
+	/** Expect STREAM-START. */
+	yaml_PARSE_STREAM_START_STATE yaml_parser_state_t = iota
+	/** Expect the beginning of an implicit document. */
+	yaml_PARSE_IMPLICIT_DOCUMENT_START_STATE
+	/** Expect DOCUMENT-START. */
+	yaml_PARSE_DOCUMENT_START_STATE
+	/** Expect the content of a document. */
+	yaml_PARSE_DOCUMENT_CONTENT_STATE
+	/** Expect DOCUMENT-END. */
+	yaml_PARSE_DOCUMENT_END_STATE
+	/** Expect a block node. */
+	yaml_PARSE_BLOCK_NODE_STATE
+	/** Expect a block node or indentless sequence. */
+	yaml_PARSE_BLOCK_NODE_OR_INDENTLESS_SEQUENCE_STATE
+	/** Expect a flow node. */
+	yaml_PARSE_FLOW_NODE_STATE
+	/** Expect the first entry of a block sequence. */
+	yaml_PARSE_BLOCK_SEQUENCE_FIRST_ENTRY_STATE
+	/** Expect an entry of a block sequence. */
+	yaml_PARSE_BLOCK_SEQUENCE_ENTRY_STATE
+	/** Expect an entry of an indentless sequence. */
+	yaml_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE
+	/** Expect the first key of a block mapping. */
+	yaml_PARSE_BLOCK_MAPPING_FIRST_KEY_STATE
+	/** Expect a block mapping key. */
+	yaml_PARSE_BLOCK_MAPPING_KEY_STATE
+	/** Expect a block mapping value. */
+	yaml_PARSE_BLOCK_MAPPING_VALUE_STATE
+	/** Expect the first entry of a flow sequence. */
+	yaml_PARSE_FLOW_SEQUENCE_FIRST_ENTRY_STATE
+	/** Expect an entry of a flow sequence. */
+	yaml_PARSE_FLOW_SEQUENCE_ENTRY_STATE
+	/** Expect a key of an ordered mapping. */
+	yaml_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_KEY_STATE
+	/** Expect a value of an ordered mapping. */
+	yaml_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE
+	/** Expect the and of an ordered mapping entry. */
+	yaml_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE
+	/** Expect the first key of a flow mapping. */
+	yaml_PARSE_FLOW_MAPPING_FIRST_KEY_STATE
+	/** Expect a key of a flow mapping. */
+	yaml_PARSE_FLOW_MAPPING_KEY_STATE
+	/** Expect a value of a flow mapping. */
+	yaml_PARSE_FLOW_MAPPING_VALUE_STATE
+	/** Expect an empty value of a flow mapping. */
+	yaml_PARSE_FLOW_MAPPING_EMPTY_VALUE_STATE
+	/** Expect nothing. */
+	yaml_PARSE_END_STATE
+)
+
+/**
+ * This structure holds aliases data.
+ */
+
+type yaml_alias_data_t struct {
+	/** The anchor. */
+	anchor []byte
+	/** The node id. */
+	index int
+	/** The anchor mark. */
+	mark YAML_mark_t
+}
+
+/**
+ * The parser structure.
+ *
+ * All members are internal.  Manage the structure using the @c yaml_parser_
+ * family of functions.
+ */
+
+type yaml_parser_t struct {
+
+	/**
+	 * @name Error handling
+	 * @{
+	 */
+
+	/** Error type. */
+	error YAML_error_type_t
+	/** Error description. */
+	problem string
+	/** The byte about which the problem occured. */
+	problem_offset int
+	/** The problematic value (@c -1 is none). */
+	problem_value int
+	/** The problem position. */
+	problem_mark YAML_mark_t
+	/** The error context. */
+	context string
+	/** The context position. */
+	context_mark YAML_mark_t
+
+	/**
+	 * @}
+	 */
+
+	/**
+	 * @name Reader stuff
+	 * @{
+	 */
+
+	/** Read handler. */
+	read_handler yaml_read_handler_t
+
+	/** Reader input data. */
+	input_reader io.Reader
+	input        []byte
+	input_pos    int
+
+	/** EOF flag */
+	eof bool
+
+	/** The working buffer. */
+	buffer     []byte
+	buffer_pos int
+
+	/* The number of unread characters in the buffer. */
+	unread int
+
+	/** The raw buffer. */
+	raw_buffer     []byte
+	raw_buffer_pos int
+
+	/** The input encoding. */
+	encoding yaml_encoding_t
+
+	/** The offset of the current position (in bytes). */
+	offset int
+
+	/** The mark of the current position. */
+	mark YAML_mark_t
+
+	/**
+	 * @}
+	 */
+
+	/**
+	 * @name Scanner stuff
+	 * @{
+	 */
+
+	/** Have we started to scan the input stream? */
+	stream_start_produced bool
+
+	/** Have we reached the end of the input stream? */
+	stream_end_produced bool
+
+	/** The number of unclosed '[' and '{' indicators. */
+	flow_level int
+
+	/** The tokens queue. */
+	tokens      []yaml_token_t
+	tokens_head int
+
+	/** The number of tokens fetched from the queue. */
+	tokens_parsed int
+
+	/* Does the tokens queue contain a token ready for dequeueing. */
+	token_available bool
+
+	/** The indentation levels stack. */
+	indents []int
+
+	/** The current indentation level. */
+	indent int
+
+	/** May a simple key occur at the current position? */
+	simple_key_allowed bool
+
+	/** The stack of simple keys. */
+	simple_keys []yaml_simple_key_t
+
+	/**
+	 * @}
+	 */
+
+	/**
+	 * @name Parser stuff
+	 * @{
+	 */
+
+	/** The parser states stack. */
+	states []yaml_parser_state_t
+
+	/** The current parser state. */
+	state yaml_parser_state_t
+
+	/** The stack of marks. */
+	marks []YAML_mark_t
+
+	/** The list of TAG directives. */
+	tag_directives []yaml_tag_directive_t
+
+	/**
+	 * @}
+	 */
+
+	/**
+	 * @name Dumper stuff
+	 * @{
+	 */
+
+	/** The alias data. */
+	aliases []yaml_alias_data_t
+
+	/** The currently parsed document. */
+	document *yaml_document_t
+
+	/**
+	 * @}
+	 */
+
+}
+
+/**
+ * The prototype of a write handler.
+ *
+ * The write handler is called when the emitter needs to flush the accumulated
+ * characters to the output.  The handler should write @a size bytes of the
+ * @a buffer to the output.
+ *
+ * @param[in,out]   data        A pointer to an application data specified by
+ *                              yaml_emitter_set_output().
+ * @param[in]       buffer      The buffer with bytes to be written.
+ * @param[in]       size        The size of the buffer.
+ *
+ * @returns On success, the handler should return @c 1.  If the handler failed,
+ * the returned value should be @c 0.
+ */
+
+type yaml_write_handler_t func(emitter *yaml_emitter_t, buffer []byte) error
+
+/** The emitter states. */
+type yaml_emitter_state_t int
+
+const (
+	/** Expect STREAM-START. */
+	yaml_EMIT_STREAM_START_STATE yaml_emitter_state_t = iota
+	/** Expect the first DOCUMENT-START or STREAM-END. */
+	yaml_EMIT_FIRST_DOCUMENT_START_STATE
+	/** Expect DOCUMENT-START or STREAM-END. */
+	yaml_EMIT_DOCUMENT_START_STATE
+	/** Expect the content of a document. */
+	yaml_EMIT_DOCUMENT_CONTENT_STATE
+	/** Expect DOCUMENT-END. */
+	yaml_EMIT_DOCUMENT_END_STATE
+	/** Expect the first item of a flow sequence. */
+	yaml_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE
+	/** Expect an item of a flow sequence. */
+	yaml_EMIT_FLOW_SEQUENCE_ITEM_STATE
+	/** Expect the first key of a flow mapping. */
+	yaml_EMIT_FLOW_MAPPING_FIRST_KEY_STATE
+	/** Expect a key of a flow mapping. */
+	yaml_EMIT_FLOW_MAPPING_KEY_STATE
+	/** Expect a value for a simple key of a flow mapping. */
+	yaml_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE
+	/** Expect a value of a flow mapping. */
+	yaml_EMIT_FLOW_MAPPING_VALUE_STATE
+	/** Expect the first item of a block sequence. */
+	yaml_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE
+	/** Expect an item of a block sequence. */
+	yaml_EMIT_BLOCK_SEQUENCE_ITEM_STATE
+	/** Expect the first key of a block mapping. */
+	yaml_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE
+	/** Expect the key of a block mapping. */
+	yaml_EMIT_BLOCK_MAPPING_KEY_STATE
+	/** Expect a value for a simple key of a block mapping. */
+	yaml_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE
+	/** Expect a value of a block mapping. */
+	yaml_EMIT_BLOCK_MAPPING_VALUE_STATE
+	/** Expect nothing. */
+	yaml_EMIT_END_STATE
+)
+
+/**
+ * The emitter structure.
+ *
+ * All members are internal.  Manage the structure using the @c yaml_emitter_
+ * family of functions.
+ */
+
+type yaml_emitter_t struct {
+
+	/**
+	 * @name Error handling
+	 * @{
+	 */
+
+	/** Error type. */
+	error YAML_error_type_t
+	/** Error description. */
+	problem string
+
+	/**
+	 * @}
+	 */
+
+	/**
+	 * @name Writer stuff
+	 * @{
+	 */
+
+	/** Write handler. */
+	write_handler yaml_write_handler_t
+
+	/** Standard (string or file) output data. */
+	output_buffer *[]byte
+	output_writer io.Writer
+
+	/** The working buffer. */
+	buffer     []byte
+	buffer_pos int
+
+	/** The raw buffer. */
+	raw_buffer     []byte
+	raw_buffer_pos int
+
+	/** The stream encoding. */
+	encoding yaml_encoding_t
+
+	/**
+	 * @}
+	 */
+
+	/**
+	 * @name Emitter stuff
+	 * @{
+	 */
+
+	/** If the output is in the canonical style? */
+	canonical bool
+	/** The number of indentation spaces. */
+	best_indent int
+	/** The preferred width of the output lines. */
+	best_width int
+	/** Allow unescaped non-ASCII characters? */
+	unicode bool
+	/** The preferred line break. */
+	line_break yaml_break_t
+
+	/** The stack of states. */
+	states []yaml_emitter_state_t
+
+	/** The current emitter state. */
+	state yaml_emitter_state_t
+
+	/** The event queue. */
+	events      []yaml_event_t
+	events_head int
+
+	/** The stack of indentation levels. */
+	indents []int
+
+	/** The list of tag directives. */
+	tag_directives []yaml_tag_directive_t
+
+	/** The current indentation level. */
+	indent int
+
+	/** The current flow level. */
+	flow_level int
+
+	/** Is it the document root context? */
+	root_context bool
+	/** Is it a sequence context? */
+	sequence_context bool
+	/** Is it a mapping context? */
+	mapping_context bool
+	/** Is it a simple mapping key context? */
+	simple_key_context bool
+
+	/** The current line. */
+	line int
+	/** The current column. */
+	column int
+	/** If the last character was a whitespace? */
+	whitespace bool
+	/** If the last character was an indentation character (' ', '-', '?', ':')? */
+	indention bool
+	/** If an explicit document end is required? */
+	open_ended bool
+
+	/** Anchor analysis. */
+	anchor_data struct {
+		/** The anchor value. */
+		anchor []byte
+		/** Is it an alias? */
+		alias bool
+	}
+
+	/** Tag analysis. */
+	tag_data struct {
+		/** The tag handle. */
+		handle []byte
+		/** The tag suffix. */
+		suffix []byte
+	}
+
+	/** Scalar analysis. */
+	scalar_data struct {
+		/** The scalar value. */
+		value []byte
+		/** Does the scalar contain line breaks? */
+		multiline bool
+		/** Can the scalar be expessed in the flow plain style? */
+		flow_plain_allowed bool
+		/** Can the scalar be expressed in the block plain style? */
+		block_plain_allowed bool
+		/** Can the scalar be expressed in the single quoted style? */
+		single_quoted_allowed bool
+		/** Can the scalar be expressed in the literal or folded styles? */
+		block_allowed bool
+		/** The output style. */
+		style yaml_scalar_style_t
+	}
+
+	/**
+	 * @}
+	 */
+
+	/**
+	 * @name Dumper stuff
+	 * @{
+	 */
+
+	/** If the stream was already opened? */
+	opened bool
+	/** If the stream was already closed? */
+	closed bool
+
+	/** The information associated with the document nodes. */
+	anchors *struct {
+		/** The number of references. */
+		references int
+		/** The anchor id. */
+		anchor int
+		/** If the node has been emitted? */
+		serialized bool
+	}
+
+	/** The last assigned anchor id. */
+	last_anchor_id int
+
+	/** The currently emitted document. */
+	document *yaml_document_t
+
+	/**
+	 * @}
+	 */
+
+}

vendor/github.com/ghodss/yaml/LICENSE

@@ -0,0 +1,50 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Sam Ghods
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+
+Copyright (c) 2012 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/ghodss/yaml/README.md

@@ -0,0 +1,116 @@
+# YAML marshaling and unmarshaling support for Go
+
+[![Build Status](https://travis-ci.org/ghodss/yaml.svg)](https://travis-ci.org/ghodss/yaml)
+
+## Introduction
+
+A wrapper around [candiedyaml](https://github.com/cloudfoundry-incubator/candiedyaml) designed to enable a better way of handling YAML when marshaling to and from structs.
+
+In short, this library first converts YAML to JSON using candiedyaml and then uses `json.Marshal` and `json.Unmarshal` to convert to or from the struct. This means that it effectively reuses the JSON struct tags as well as the custom JSON methods `MarshalJSON` and `UnmarshalJSON` unlike candiedyaml. For a detailed overview of the rationale behind this method, [see this blog post](http://ghodss.com/2014/the-right-way-to-handle-yaml-in-golang/).
+
+## Compatibility
+
+This package uses [candiedyaml](https://github.com/cloudfoundry-incubator/candiedyaml) and therefore supports [everything candiedyaml supports](https://github.com/cloudfoundry-incubator/candiedyaml#candiedyaml).
+
+## Caveats
+
+**Caveat #1:** When using `yaml.Marshal` and `yaml.Unmarshal`, binary data should NOT be preceded with the `!!binary` YAML tag. If you do, candiedyaml will convert the binary data from base64 to native binary data, which is not compatible with JSON. You can still use binary in your YAML files though - just store them without the `!!binary` tag and decode the base64 in your code (e.g. in the custom JSON methods `MarshalJSON` and `UnmarshalJSON`). This also has the benefit that your YAML and your JSON binary data will be decoded exactly the same way. As an example:
+
+```
+BAD:
+	exampleKey: !!binary gIGC
+
+GOOD:
+	exampleKey: gIGC
+... and decode the base64 data in your code.
+```
+
+**Caveat #2:** When using `YAMLToJSON` directly, maps with keys that are maps will result in an error since this is not supported by JSON. This error will occur in `Unmarshal` as well since you can't unmarshal map keys anyways since struct fields can't be keys.
+
+## Installation and usage
+
+To install, run:
+
+```
+$ go get github.com/ghodss/yaml
+```
+
+And import using:
+
+```
+import "github.com/ghodss/yaml"
+```
+
+Usage is very similar to the JSON library:
+
+```go
+import (
+	"fmt"
+
+	"github.com/ghodss/yaml"
+)
+
+type Person struct {
+	Name string `json:"name"`  // Affects YAML field names too.
+	Age int `json:"name"`
+}
+
+func main() {
+	// Marshal a Person struct to YAML.
+	p := Person{"John", 30}
+	y, err := yaml.Marshal(p)
+	if err != nil {
+		fmt.Printf("err: %v\n", err)
+		return
+	}
+	fmt.Println(string(y))
+	/* Output:
+	name: John
+	age: 30
+	*/
+
+	// Unmarshal the YAML back into a Person struct.
+	var p2 Person
+	err := yaml.Unmarshal(y, &p2)
+	if err != nil {
+		fmt.Printf("err: %v\n", err)
+		return
+	}
+	fmt.Println(p2)
+	/* Output:
+	{John 30}
+	*/
+}
+```
+
+`yaml.YAMLToJSON` and `yaml.JSONToYAML` methods are also available:
+
+```go
+import (
+	"fmt"
+
+	"github.com/ghodss/yaml"
+)
+func main() {
+	j := []byte(`{"name": "John", "age": 30}`)
+	y, err := yaml.JSONToYAML(j)
+	if err != nil {
+		fmt.Printf("err: %v\n", err)
+		return
+	}
+	fmt.Println(string(y))
+	/* Output:
+	name: John
+	age: 30
+	*/
+	j2, err := yaml.YAMLToJSON(y)
+	if err != nil {
+		fmt.Printf("err: %v\n", err)
+		return
+	}
+	fmt.Println(string(j2))
+	/* Output:
+	{"age":30,"name":"John"}
+	*/
+}
+```

vendor/github.com/ghodss/yaml/fields.go

@@ -0,0 +1,497 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+package yaml
+
+import (
+	"bytes"
+	"encoding"
+	"encoding/json"
+	"reflect"
+	"sort"
+	"strings"
+	"sync"
+	"unicode"
+	"unicode/utf8"
+)
+
+// indirect walks down v allocating pointers as needed,
+// until it gets to a non-pointer.
+// if it encounters an Unmarshaler, indirect stops and returns that.
+// if decodingNull is true, indirect stops at the last pointer so it can be set to nil.
+func indirect(v reflect.Value, decodingNull bool) (json.Unmarshaler, encoding.TextUnmarshaler, reflect.Value) {
+	// If v is a named type and is addressable,
+	// start with its address, so that if the type has pointer methods,
+	// we find them.
+	if v.Kind() != reflect.Ptr && v.Type().Name() != "" && v.CanAddr() {
+		v = v.Addr()
+	}
+	for {
+		// Load value from interface, but only if the result will be
+		// usefully addressable.
+		if v.Kind() == reflect.Interface && !v.IsNil() {
+			e := v.Elem()
+			if e.Kind() == reflect.Ptr && !e.IsNil() && (!decodingNull || e.Elem().Kind() == reflect.Ptr) {
+				v = e
+				continue
+			}
+		}
+
+		if v.Kind() != reflect.Ptr {
+			break
+		}
+
+		if v.Elem().Kind() != reflect.Ptr && decodingNull && v.CanSet() {
+			break
+		}
+		if v.IsNil() {
+			v.Set(reflect.New(v.Type().Elem()))
+		}
+		if v.Type().NumMethod() > 0 {
+			if u, ok := v.Interface().(json.Unmarshaler); ok {
+				return u, nil, reflect.Value{}
+			}
+			if u, ok := v.Interface().(encoding.TextUnmarshaler); ok {
+				return nil, u, reflect.Value{}
+			}
+		}
+		v = v.Elem()
+	}
+	return nil, nil, v
+}
+
+// A field represents a single field found in a struct.
+type field struct {
+	name      string
+	nameBytes []byte                 // []byte(name)
+	equalFold func(s, t []byte) bool // bytes.EqualFold or equivalent
+
+	tag       bool
+	index     []int
+	typ       reflect.Type
+	omitEmpty bool
+	quoted    bool
+}
+
+func fillField(f field) field {
+	f.nameBytes = []byte(f.name)
+	f.equalFold = foldFunc(f.nameBytes)
+	return f
+}
+
+// byName sorts field by name, breaking ties with depth,
+// then breaking ties with "name came from json tag", then
+// breaking ties with index sequence.
+type byName []field
+
+func (x byName) Len() int { return len(x) }
+
+func (x byName) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
+
+func (x byName) Less(i, j int) bool {
+	if x[i].name != x[j].name {
+		return x[i].name < x[j].name
+	}
+	if len(x[i].index) != len(x[j].index) {
+		return len(x[i].index) < len(x[j].index)
+	}
+	if x[i].tag != x[j].tag {
+		return x[i].tag
+	}
+	return byIndex(x).Less(i, j)
+}
+
+// byIndex sorts field by index sequence.
+type byIndex []field
+
+func (x byIndex) Len() int { return len(x) }
+
+func (x byIndex) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
+
+func (x byIndex) Less(i, j int) bool {
+	for k, xik := range x[i].index {
+		if k >= len(x[j].index) {
+			return false
+		}
+		if xik != x[j].index[k] {
+			return xik < x[j].index[k]
+		}
+	}
+	return len(x[i].index) < len(x[j].index)
+}
+
+// typeFields returns a list of fields that JSON should recognize for the given type.
+// The algorithm is breadth-first search over the set of structs to include - the top struct
+// and then any reachable anonymous structs.
+func typeFields(t reflect.Type) []field {
+	// Anonymous fields to explore at the current level and the next.
+	current := []field{}
+	next := []field{{typ: t}}
+
+	// Count of queued names for current level and the next.
+	count := map[reflect.Type]int{}
+	nextCount := map[reflect.Type]int{}
+
+	// Types already visited at an earlier level.
+	visited := map[reflect.Type]bool{}
+
+	// Fields found.
+	var fields []field
+
+	for len(next) > 0 {
+		current, next = next, current[:0]
+		count, nextCount = nextCount, map[reflect.Type]int{}
+
+		for _, f := range current {
+			if visited[f.typ] {
+				continue
+			}
+			visited[f.typ] = true
+
+			// Scan f.typ for fields to include.
+			for i := 0; i < f.typ.NumField(); i++ {
+				sf := f.typ.Field(i)
+				if sf.PkgPath != "" { // unexported
+					continue
+				}
+				tag := sf.Tag.Get("json")
+				if tag == "-" {
+					continue
+				}
+				name, opts := parseTag(tag)
+				if !isValidTag(name) {
+					name = ""
+				}
+				index := make([]int, len(f.index)+1)
+				copy(index, f.index)
+				index[len(f.index)] = i
+
+				ft := sf.Type
+				if ft.Name() == "" && ft.Kind() == reflect.Ptr {
+					// Follow pointer.
+					ft = ft.Elem()
+				}
+
+				// Record found field and index sequence.
+				if name != "" || !sf.Anonymous || ft.Kind() != reflect.Struct {
+					tagged := name != ""
+					if name == "" {
+						name = sf.Name
+					}
+					fields = append(fields, fillField(field{
+						name:      name,
+						tag:       tagged,
+						index:     index,
+						typ:       ft,
+						omitEmpty: opts.Contains("omitempty"),
+						quoted:    opts.Contains("string"),
+					}))
+					if count[f.typ] > 1 {
+						// If there were multiple instances, add a second,
+						// so that the annihilation code will see a duplicate.
+						// It only cares about the distinction between 1 or 2,
+						// so don't bother generating any more copies.
+						fields = append(fields, fields[len(fields)-1])
+					}
+					continue
+				}
+
+				// Record new anonymous struct to explore in next round.
+				nextCount[ft]++
+				if nextCount[ft] == 1 {
+					next = append(next, fillField(field{name: ft.Name(), index: index, typ: ft}))
+				}
+			}
+		}
+	}
+
+	sort.Sort(byName(fields))
+
+	// Delete all fields that are hidden by the Go rules for embedded fields,
+	// except that fields with JSON tags are promoted.
+
+	// The fields are sorted in primary order of name, secondary order
+	// of field index length. Loop over names; for each name, delete
+	// hidden fields by choosing the one dominant field that survives.
+	out := fields[:0]
+	for advance, i := 0, 0; i < len(fields); i += advance {
+		// One iteration per name.
+		// Find the sequence of fields with the name of this first field.
+		fi := fields[i]
+		name := fi.name
+		for advance = 1; i+advance < len(fields); advance++ {
+			fj := fields[i+advance]
+			if fj.name != name {
+				break
+			}
+		}
+		if advance == 1 { // Only one field with this name
+			out = append(out, fi)
+			continue
+		}
+		dominant, ok := dominantField(fields[i : i+advance])
+		if ok {
+			out = append(out, dominant)
+		}
+	}
+
+	fields = out
+	sort.Sort(byIndex(fields))
+
+	return fields
+}
+
+// dominantField looks through the fields, all of which are known to
+// have the same name, to find the single field that dominates the
+// others using Go's embedding rules, modified by the presence of
+// JSON tags. If there are multiple top-level fields, the boolean
+// will be false: This condition is an error in Go and we skip all
+// the fields.
+func dominantField(fields []field) (field, bool) {
+	// The fields are sorted in increasing index-length order. The winner
+	// must therefore be one with the shortest index length. Drop all
+	// longer entries, which is easy: just truncate the slice.
+	length := len(fields[0].index)
+	tagged := -1 // Index of first tagged field.
+	for i, f := range fields {
+		if len(f.index) > length {
+			fields = fields[:i]
+			break
+		}
+		if f.tag {
+			if tagged >= 0 {
+				// Multiple tagged fields at the same level: conflict.
+				// Return no field.
+				return field{}, false
+			}
+			tagged = i
+		}
+	}
+	if tagged >= 0 {
+		return fields[tagged], true
+	}
+	// All remaining fields have the same length. If there's more than one,
+	// we have a conflict (two fields named "X" at the same level) and we
+	// return no field.
+	if len(fields) > 1 {
+		return field{}, false
+	}
+	return fields[0], true
+}
+
+var fieldCache struct {
+	sync.RWMutex
+	m map[reflect.Type][]field
+}
+
+// cachedTypeFields is like typeFields but uses a cache to avoid repeated work.
+func cachedTypeFields(t reflect.Type) []field {
+	fieldCache.RLock()
+	f := fieldCache.m[t]
+	fieldCache.RUnlock()
+	if f != nil {
+		return f
+	}
+
+	// Compute fields without lock.
+	// Might duplicate effort but won't hold other computations back.
+	f = typeFields(t)
+	if f == nil {
+		f = []field{}
+	}
+
+	fieldCache.Lock()
+	if fieldCache.m == nil {
+		fieldCache.m = map[reflect.Type][]field{}
+	}
+	fieldCache.m[t] = f
+	fieldCache.Unlock()
+	return f
+}
+
+func isValidTag(s string) bool {
+	if s == "" {
+		return false
+	}
+	for _, c := range s {
+		switch {
+		case strings.ContainsRune("!#$%&()*+-./:<=>?@[]^_{|}~ ", c):
+			// Backslash and quote chars are reserved, but
+			// otherwise any punctuation chars are allowed
+			// in a tag name.
+		default:
+			if !unicode.IsLetter(c) && !unicode.IsDigit(c) {
+				return false
+			}
+		}
+	}
+	return true
+}
+
+const (
+	caseMask     = ^byte(0x20) // Mask to ignore case in ASCII.
+	kelvin       = '\u212a'
+	smallLongEss = '\u017f'
+)
+
+// foldFunc returns one of four different case folding equivalence
+// functions, from most general (and slow) to fastest:
+//
+// 1) bytes.EqualFold, if the key s contains any non-ASCII UTF-8
+// 2) equalFoldRight, if s contains special folding ASCII ('k', 'K', 's', 'S')
+// 3) asciiEqualFold, no special, but includes non-letters (including _)
+// 4) simpleLetterEqualFold, no specials, no non-letters.
+//
+// The letters S and K are special because they map to 3 runes, not just 2:
+//  * S maps to s and to U+017F 'ſ' Latin small letter long s
+//  * k maps to K and to U+212A 'K' Kelvin sign
+// See http://play.golang.org/p/tTxjOc0OGo
+//
+// The returned function is specialized for matching against s and
+// should only be given s. It's not curried for performance reasons.
+func foldFunc(s []byte) func(s, t []byte) bool {
+	nonLetter := false
+	special := false // special letter
+	for _, b := range s {
+		if b >= utf8.RuneSelf {
+			return bytes.EqualFold
+		}
+		upper := b & caseMask
+		if upper < 'A' || upper > 'Z' {
+			nonLetter = true
+		} else if upper == 'K' || upper == 'S' {
+			// See above for why these letters are special.
+			special = true
+		}
+	}
+	if special {
+		return equalFoldRight
+	}
+	if nonLetter {
+		return asciiEqualFold
+	}
+	return simpleLetterEqualFold
+}
+
+// equalFoldRight is a specialization of bytes.EqualFold when s is
+// known to be all ASCII (including punctuation), but contains an 's',
+// 'S', 'k', or 'K', requiring a Unicode fold on the bytes in t.
+// See comments on foldFunc.
+func equalFoldRight(s, t []byte) bool {
+	for _, sb := range s {
+		if len(t) == 0 {
+			return false
+		}
+		tb := t[0]
+		if tb < utf8.RuneSelf {
+			if sb != tb {
+				sbUpper := sb & caseMask
+				if 'A' <= sbUpper && sbUpper <= 'Z' {
+					if sbUpper != tb&caseMask {
+						return false
+					}
+				} else {
+					return false
+				}
+			}
+			t = t[1:]
+			continue
+		}
+		// sb is ASCII and t is not. t must be either kelvin
+		// sign or long s; sb must be s, S, k, or K.
+		tr, size := utf8.DecodeRune(t)
+		switch sb {
+		case 's', 'S':
+			if tr != smallLongEss {
+				return false
+			}
+		case 'k', 'K':
+			if tr != kelvin {
+				return false
+			}
+		default:
+			return false
+		}
+		t = t[size:]
+
+	}
+	if len(t) > 0 {
+		return false
+	}
+	return true
+}
+
+// asciiEqualFold is a specialization of bytes.EqualFold for use when
+// s is all ASCII (but may contain non-letters) and contains no
+// special-folding letters.
+// See comments on foldFunc.
+func asciiEqualFold(s, t []byte) bool {
+	if len(s) != len(t) {
+		return false
+	}
+	for i, sb := range s {
+		tb := t[i]
+		if sb == tb {
+			continue
+		}
+		if ('a' <= sb && sb <= 'z') || ('A' <= sb && sb <= 'Z') {
+			if sb&caseMask != tb&caseMask {
+				return false
+			}
+		} else {
+			return false
+		}
+	}
+	return true
+}
+
+// simpleLetterEqualFold is a specialization of bytes.EqualFold for
+// use when s is all ASCII letters (no underscores, etc) and also
+// doesn't contain 'k', 'K', 's', or 'S'.
+// See comments on foldFunc.
+func simpleLetterEqualFold(s, t []byte) bool {
+	if len(s) != len(t) {
+		return false
+	}
+	for i, b := range s {
+		if b&caseMask != t[i]&caseMask {
+			return false
+		}
+	}
+	return true
+}
+
+// tagOptions is the string following a comma in a struct field's "json"
+// tag, or the empty string. It does not include the leading comma.
+type tagOptions string
+
+// parseTag splits a struct field's json tag into its name and
+// comma-separated options.
+func parseTag(tag string) (string, tagOptions) {
+	if idx := strings.Index(tag, ","); idx != -1 {
+		return tag[:idx], tagOptions(tag[idx+1:])
+	}
+	return tag, tagOptions("")
+}
+
+// Contains reports whether a comma-separated list of options
+// contains a particular substr flag. substr must be surrounded by a
+// string boundary or commas.
+func (o tagOptions) Contains(optionName string) bool {
+	if len(o) == 0 {
+		return false
+	}
+	s := string(o)
+	for s != "" {
+		var next string
+		i := strings.Index(s, ",")
+		if i >= 0 {
+			s, next = s[:i], s[i+1:]
+		}
+		if s == optionName {
+			return true
+		}
+		s = next
+	}
+	return false
+}

vendor/github.com/ghodss/yaml/yaml.go

@@ -0,0 +1,277 @@
+package yaml
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"reflect"
+	"strconv"
+
+	yaml "github.com/cloudfoundry-incubator/candiedyaml"
+)
+
+// Marshals the object into JSON then converts JSON to YAML and returns the
+// YAML.
+func Marshal(o interface{}) ([]byte, error) {
+	j, err := json.Marshal(o)
+	if err != nil {
+		return nil, fmt.Errorf("error marshaling into JSON: ", err)
+	}
+
+	y, err := JSONToYAML(j)
+	if err != nil {
+		return nil, fmt.Errorf("error converting JSON to YAML: ", err)
+	}
+
+	return y, nil
+}
+
+// Converts YAML to JSON then uses JSON to unmarshal into an object.
+func Unmarshal(y []byte, o interface{}) error {
+	vo := reflect.ValueOf(o)
+	j, err := yamlToJSON(y, &vo)
+	if err != nil {
+		return fmt.Errorf("error converting YAML to JSON: %v", err)
+	}
+
+	err = json.Unmarshal(j, o)
+	if err != nil {
+		return fmt.Errorf("error unmarshaling JSON: %v", err)
+	}
+
+	return nil
+}
+
+// Convert JSON to YAML.
+func JSONToYAML(j []byte) ([]byte, error) {
+	// Convert the JSON to an object.
+	var jsonObj interface{}
+	// We are using yaml.Unmarshal here (instead of json.Unmarshal) because the
+	// Go JSON library doesn't try to pick the right number type (int, float,
+	// etc.) when unmarshling to interface{}, it just picks float64
+	// universally. go-yaml does go through the effort of picking the right
+	// number type, so we can preserve number type throughout this process.
+	err := yaml.Unmarshal(j, &jsonObj)
+	if err != nil {
+		return nil, err
+	}
+
+	// Marshal this object into YAML.
+	return yaml.Marshal(jsonObj)
+}
+
+// Convert YAML to JSON. Since JSON is a subset of YAML, passing JSON through
+// this method should be a no-op.
+//
+// Things YAML can do that are not supported by JSON:
+// * In YAML you can have binary and null keys in your maps. These are invalid
+//   in JSON. (int and float keys are converted to strings.)
+// * Binary data in YAML with the !!binary tag is not supported. If you want to
+//   use binary data with this library, encode the data as base64 as usual but do
+//   not use the !!binary tag in your YAML. This will ensure the original base64
+//   encoded data makes it all the way through to the JSON.
+func YAMLToJSON(y []byte) ([]byte, error) {
+	return yamlToJSON(y, nil)
+}
+
+func yamlToJSON(y []byte, jsonTarget *reflect.Value) ([]byte, error) {
+	// Convert the YAML to an object.
+	var yamlObj interface{}
+	err := yaml.Unmarshal(y, &yamlObj)
+	if err != nil {
+		return nil, err
+	}
+
+	// YAML objects are not completely compatible with JSON objects (e.g. you
+	// can have non-string keys in YAML). So, convert the YAML-compatible object
+	// to a JSON-compatible object, failing with an error if irrecoverable
+	// incompatibilties happen along the way.
+	jsonObj, err := convertToJSONableObject(yamlObj, jsonTarget)
+	if err != nil {
+		return nil, err
+	}
+
+	// Convert this object to JSON and return the data.
+	return json.Marshal(jsonObj)
+}
+
+func convertToJSONableObject(yamlObj interface{}, jsonTarget *reflect.Value) (interface{}, error) {
+	var err error
+
+	// Resolve jsonTarget to a concrete value (i.e. not a pointer or an
+	// interface). We pass decodingNull as false because we're not actually
+	// decoding into the value, we're just checking if the ultimate target is a
+	// string.
+	if jsonTarget != nil {
+		ju, tu, pv := indirect(*jsonTarget, false)
+		// We have a JSON or Text Umarshaler at this level, so we can't be trying
+		// to decode into a string.
+		if ju != nil || tu != nil {
+			jsonTarget = nil
+		} else {
+			jsonTarget = &pv
+		}
+	}
+
+	// If yamlObj is a number or a boolean, check if jsonTarget is a string -
+	// if so, coerce.  Else return normal.
+	// If yamlObj is a map or array, find the field that each key is
+	// unmarshaling to, and when you recurse pass the reflect.Value for that
+	// field back into this function.
+	switch typedYAMLObj := yamlObj.(type) {
+	case map[interface{}]interface{}:
+		// JSON does not support arbitrary keys in a map, so we must convert
+		// these keys to strings.
+		//
+		// From my reading of go-yaml v2 (specifically the resolve function),
+		// keys can only have the types string, int, int64, float64, binary
+		// (unsupported), or null (unsupported).
+		strMap := make(map[string]interface{})
+		for k, v := range typedYAMLObj {
+			// Resolve the key to a string first.
+			var keyString string
+			switch typedKey := k.(type) {
+			case string:
+				keyString = typedKey
+			case int:
+				keyString = strconv.Itoa(typedKey)
+			case int64:
+				// go-yaml will only return an int64 as a key if the system
+				// architecture is 32-bit and the key's value is between 32-bit
+				// and 64-bit. Otherwise the key type will simply be int.
+				keyString = strconv.FormatInt(typedKey, 10)
+			case float64:
+				// Stolen from go-yaml to use the same conversion to string as
+				// the go-yaml library uses to convert float to string when
+				// Marshaling.
+				s := strconv.FormatFloat(typedKey, 'g', -1, 32)
+				switch s {
+				case "+Inf":
+					s = ".inf"
+				case "-Inf":
+					s = "-.inf"
+				case "NaN":
+					s = ".nan"
+				}
+				keyString = s
+			case bool:
+				if typedKey {
+					keyString = "true"
+				} else {
+					keyString = "false"
+				}
+			default:
+				return nil, fmt.Errorf("Unsupported map key of type: %s, key: %+#v, value: %+#v",
+					reflect.TypeOf(k), k, v)
+			}
+
+			// jsonTarget should be a struct or a map. If it's a struct, find
+			// the field it's going to map to and pass its reflect.Value. If
+			// it's a map, find the element type of the map and pass the
+			// reflect.Value created from that type. If it's neither, just pass
+			// nil - JSON conversion will error for us if it's a real issue.
+			if jsonTarget != nil {
+				t := *jsonTarget
+				if t.Kind() == reflect.Struct {
+					keyBytes := []byte(keyString)
+					// Find the field that the JSON library would use.
+					var f *field
+					fields := cachedTypeFields(t.Type())
+					for i := range fields {
+						ff := &fields[i]
+						if bytes.Equal(ff.nameBytes, keyBytes) {
+							f = ff
+							break
+						}
+						// Do case-insensitive comparison.
+						if f == nil && ff.equalFold(ff.nameBytes, keyBytes) {
+							f = ff
+						}
+					}
+					if f != nil {
+						// Find the reflect.Value of the most preferential
+						// struct field.
+						jtf := t.Field(f.index[0])
+						strMap[keyString], err = convertToJSONableObject(v, &jtf)
+						if err != nil {
+							return nil, err
+						}
+						continue
+					}
+				} else if t.Kind() == reflect.Map {
+					// Create a zero value of the map's element type to use as
+					// the JSON target.
+					jtv := reflect.Zero(t.Type().Elem())
+					strMap[keyString], err = convertToJSONableObject(v, &jtv)
+					if err != nil {
+						return nil, err
+					}
+					continue
+				}
+			}
+			strMap[keyString], err = convertToJSONableObject(v, nil)
+			if err != nil {
+				return nil, err
+			}
+		}
+		return strMap, nil
+	case []interface{}:
+		// We need to recurse into arrays in case there are any
+		// map[interface{}]interface{}'s inside and to convert any
+		// numbers to strings.
+
+		// If jsonTarget is a slice (which it really should be), find the
+		// thing it's going to map to. If it's not a slice, just pass nil
+		// - JSON conversion will error for us if it's a real issue.
+		var jsonSliceElemValue *reflect.Value
+		if jsonTarget != nil {
+			t := *jsonTarget
+			if t.Kind() == reflect.Slice {
+				// By default slices point to nil, but we need a reflect.Value
+				// pointing to a value of the slice type, so we create one here.
+				ev := reflect.Indirect(reflect.New(t.Type().Elem()))
+				jsonSliceElemValue = &ev
+			}
+		}
+
+		// Make and use a new array.
+		arr := make([]interface{}, len(typedYAMLObj))
+		for i, v := range typedYAMLObj {
+			arr[i], err = convertToJSONableObject(v, jsonSliceElemValue)
+			if err != nil {
+				return nil, err
+			}
+		}
+		return arr, nil
+	default:
+		// If the target type is a string and the YAML type is a number,
+		// convert the YAML type to a string.
+		if jsonTarget != nil && (*jsonTarget).Kind() == reflect.String {
+			// Based on my reading of go-yaml, it may return int, int64,
+			// float64, or uint64.
+			var s string
+			switch typedVal := typedYAMLObj.(type) {
+			case int:
+				s = strconv.FormatInt(int64(typedVal), 10)
+			case int64:
+				s = strconv.FormatInt(typedVal, 10)
+			case float64:
+				s = strconv.FormatFloat(typedVal, 'g', -1, 32)
+			case uint64:
+				s = strconv.FormatUint(typedVal, 10)
+			case bool:
+				if typedVal {
+					s = "true"
+				} else {
+					s = "false"
+				}
+			}
+			if len(s) > 0 {
+				yamlObj = interface{}(s)
+			}
+		}
+		return yamlObj, nil
+	}
+
+	return nil, nil
+}

vendor/vendor.json

@@ -12,6 +12,11 @@
 			"revision": "4b6ea7319e214d98c938f12692336f7ca9348d6b",
 			"revisionTime": "2016-03-17T14:11:10Z"
 		},
+		{
+			"path": "github.com/cloudfoundry-incubator/candiedyaml",
+			"revision": "5cef21e2e4f0fd147973b558d4db7395176bcd95",
+			"revisionTime": "2016-03-22T13:50:45-07:00"
+		},
 		{
 			"origin": "github.com/stretchr/testify/vendor/github.com/davecgh/go-spew/spew",
 			"path": "github.com/davecgh/go-spew/spew",
@@ -58,6 +63,11 @@
 			"revision": "889391d730237f8aca06ce3e62975112983f96b4",
 			"revisionTime": "2016-01-23T18:11:54-03:00"
 		},
+		{
+			"path": "github.com/ghodss/yaml",
+			"revision": "1a6f069841556a7bcaff4a397ca6e8328d266c2f",
+			"revisionTime": "2016-03-07T13:52:05-08:00"
+		},
 		{
 			"path": "github.com/gin-gonic/contrib/ginrus",
 			"revision": "14f66d54cdb96059bafca98665bcc6d9df4951f2",