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c28f7cb29f
Initial part of #435
111 lines
3.1 KiB
Go
111 lines
3.1 KiB
Go
// Package astfmt implements `ast.Node` formatting with fmt-like API.
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package astfmt
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import (
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"bytes"
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"fmt"
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"go/ast"
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"go/printer"
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"go/token"
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"io"
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)
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// Println calls fmt.Println with additional support of %s format
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// for ast.Node arguments.
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//
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// Uses empty file set for AST printing.
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func Println(args ...interface{}) error {
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return defaultPrinter.Println(args...)
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}
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// Fprintf calls fmt.Fprintf with additional support of %s format
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// for ast.Node arguments.
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//
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// Uses empty file set for AST printing.
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func Fprintf(w io.Writer, format string, args ...interface{}) error {
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return defaultPrinter.Fprintf(w, format, args...)
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}
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// Sprintf calls fmt.Sprintf with additional support of %s format
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// for ast.Node arguments.
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//
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// Uses empty file set for AST printing.
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func Sprintf(format string, args ...interface{}) string {
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return defaultPrinter.Sprintf(format, args...)
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}
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// Sprint calls fmt.Sprint with additional support of %s format
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// for ast.Node arguments.
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//
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// Uses empty file set for AST printing.
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func Sprint(args ...interface{}) string {
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return defaultPrinter.Sprint(args...)
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}
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// NewPrinter returns printer that uses bound file set when printing AST nodes.
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func NewPrinter(fset *token.FileSet) *Printer {
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return &Printer{fset: fset}
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}
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// Printer provides API close to fmt package for printing AST nodes.
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// Unlike freestanding functions from this package, it makes it possible
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// to associate appropriate file set for better output.
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type Printer struct {
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fset *token.FileSet
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}
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// Println printer method is like Println function, but uses bound file set when printing.
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func (p *Printer) Println(args ...interface{}) error {
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_, err := fmt.Println(wrapArgs(p.fset, args)...)
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return err
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}
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// Fprintf printer method is like Fprintf function, but uses bound file set when printing.
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func (p *Printer) Fprintf(w io.Writer, format string, args ...interface{}) error {
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_, err := fmt.Fprintf(w, format, wrapArgs(p.fset, args)...)
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return err
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}
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// Sprintf printer method is like Sprintf function, but uses bound file set when printing.
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func (p *Printer) Sprintf(format string, args ...interface{}) string {
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return fmt.Sprintf(format, wrapArgs(p.fset, args)...)
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}
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// Sprint printer method is like Sprint function, but uses bound file set when printing.
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func (p *Printer) Sprint(args ...interface{}) string {
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return fmt.Sprint(wrapArgs(p.fset, args)...)
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}
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// defaultPrinter is used in printing functions like Println.
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// Uses empty file set.
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var defaultPrinter = NewPrinter(token.NewFileSet())
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// wrapArgs returns arguments slice with every ast.Node element
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// replaced with fmtNode wrapper that supports additional formatting.
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func wrapArgs(fset *token.FileSet, args []interface{}) []interface{} {
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for i := range args {
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if x, ok := args[i].(ast.Node); ok {
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args[i] = fmtNode{fset: fset, node: x}
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}
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}
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return args
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}
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type fmtNode struct {
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fset *token.FileSet
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node ast.Node
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}
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func (n fmtNode) String() string {
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var buf bytes.Buffer
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if err := printer.Fprint(&buf, n.fset, n.node); err != nil {
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return fmt.Sprintf("%%!s(ast.Node=%s)", err)
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}
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return buf.String()
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}
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func (n fmtNode) GoString() string {
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var buf bytes.Buffer
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fmt.Fprintf(&buf, "%#v", n.node)
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return buf.String()
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}
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