gotosocial/vendor/github.com/yuin/goldmark/parser/code_span.go
Autumn! eb08529f35
[chore/bugfix] Switch markdown from blackfriday to goldmark (#1267)
Co-authored-by: Autumn! <autumnull@posteo.net>
2022-12-16 12:20:22 +01:00

85 lines
2.1 KiB
Go

package parser
import (
"github.com/yuin/goldmark/ast"
"github.com/yuin/goldmark/text"
)
type codeSpanParser struct {
}
var defaultCodeSpanParser = &codeSpanParser{}
// NewCodeSpanParser return a new InlineParser that parses inline codes
// surrounded by '`' .
func NewCodeSpanParser() InlineParser {
return defaultCodeSpanParser
}
func (s *codeSpanParser) Trigger() []byte {
return []byte{'`'}
}
func (s *codeSpanParser) Parse(parent ast.Node, block text.Reader, pc Context) ast.Node {
line, startSegment := block.PeekLine()
opener := 0
for ; opener < len(line) && line[opener] == '`'; opener++ {
}
block.Advance(opener)
l, pos := block.Position()
node := ast.NewCodeSpan()
for {
line, segment := block.PeekLine()
if line == nil {
block.SetPosition(l, pos)
return ast.NewTextSegment(startSegment.WithStop(startSegment.Start + opener))
}
for i := 0; i < len(line); i++ {
c := line[i]
if c == '`' {
oldi := i
for ; i < len(line) && line[i] == '`'; i++ {
}
closure := i - oldi
if closure == opener && (i >= len(line) || line[i] != '`') {
segment = segment.WithStop(segment.Start + i - closure)
if !segment.IsEmpty() {
node.AppendChild(node, ast.NewRawTextSegment(segment))
}
block.Advance(i)
goto end
}
}
}
node.AppendChild(node, ast.NewRawTextSegment(segment))
block.AdvanceLine()
}
end:
if !node.IsBlank(block.Source()) {
// trim first halfspace and last halfspace
segment := node.FirstChild().(*ast.Text).Segment
shouldTrimmed := true
if !(!segment.IsEmpty() && isSpaceOrNewline(block.Source()[segment.Start])) {
shouldTrimmed = false
}
segment = node.LastChild().(*ast.Text).Segment
if !(!segment.IsEmpty() && isSpaceOrNewline(block.Source()[segment.Stop-1])) {
shouldTrimmed = false
}
if shouldTrimmed {
t := node.FirstChild().(*ast.Text)
segment := t.Segment
t.Segment = segment.WithStart(segment.Start + 1)
t = node.LastChild().(*ast.Text)
segment = node.LastChild().(*ast.Text).Segment
t.Segment = segment.WithStop(segment.Stop - 1)
}
}
return node
}
func isSpaceOrNewline(c byte) bool {
return c == ' ' || c == '\n'
}