You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
115 lines
3.0 KiB
115 lines
3.0 KiB
package parser
|
|
|
|
import (
|
|
"bytes"
|
|
|
|
"github.com/yuin/goldmark/ast"
|
|
"github.com/yuin/goldmark/text"
|
|
"github.com/yuin/goldmark/util"
|
|
)
|
|
|
|
type fencedCodeBlockParser struct {
|
|
}
|
|
|
|
var defaultFencedCodeBlockParser = &fencedCodeBlockParser{}
|
|
|
|
// NewFencedCodeBlockParser returns a new BlockParser that
|
|
// parses fenced code blocks.
|
|
func NewFencedCodeBlockParser() BlockParser {
|
|
return defaultFencedCodeBlockParser
|
|
}
|
|
|
|
type fenceData struct {
|
|
char byte
|
|
indent int
|
|
length int
|
|
node ast.Node
|
|
}
|
|
|
|
var fencedCodeBlockInfoKey = NewContextKey()
|
|
|
|
func (b *fencedCodeBlockParser) Trigger() []byte {
|
|
return []byte{'~', '`'}
|
|
}
|
|
|
|
func (b *fencedCodeBlockParser) Open(parent ast.Node, reader text.Reader, pc Context) (ast.Node, State) {
|
|
line, segment := reader.PeekLine()
|
|
pos := pc.BlockOffset()
|
|
if pos < 0 || (line[pos] != '`' && line[pos] != '~') {
|
|
return nil, NoChildren
|
|
}
|
|
findent := pos
|
|
fenceChar := line[pos]
|
|
i := pos
|
|
for ; i < len(line) && line[i] == fenceChar; i++ {
|
|
}
|
|
oFenceLength := i - pos
|
|
if oFenceLength < 3 {
|
|
return nil, NoChildren
|
|
}
|
|
var info *ast.Text
|
|
if i < len(line)-1 {
|
|
rest := line[i:]
|
|
left := util.TrimLeftSpaceLength(rest)
|
|
right := util.TrimRightSpaceLength(rest)
|
|
if left < len(rest)-right {
|
|
infoStart, infoStop := segment.Start-segment.Padding+i+left, segment.Stop-right
|
|
value := rest[left : len(rest)-right]
|
|
if fenceChar == '`' && bytes.IndexByte(value, '`') > -1 {
|
|
return nil, NoChildren
|
|
} else if infoStart != infoStop {
|
|
info = ast.NewTextSegment(text.NewSegment(infoStart, infoStop))
|
|
}
|
|
}
|
|
}
|
|
node := ast.NewFencedCodeBlock(info)
|
|
pc.Set(fencedCodeBlockInfoKey, &fenceData{fenceChar, findent, oFenceLength, node})
|
|
return node, NoChildren
|
|
|
|
}
|
|
|
|
func (b *fencedCodeBlockParser) Continue(node ast.Node, reader text.Reader, pc Context) State {
|
|
line, segment := reader.PeekLine()
|
|
fdata := pc.Get(fencedCodeBlockInfoKey).(*fenceData)
|
|
|
|
// if code block line starts with a tab, keep a tab as it is.
|
|
if segment.Padding != 0 {
|
|
preserveLeadingTabInCodeBlock(&segment, reader, fdata.indent)
|
|
}
|
|
w, pos := util.IndentWidth(line, reader.LineOffset())
|
|
if w < 4 {
|
|
i := pos
|
|
for ; i < len(line) && line[i] == fdata.char; i++ {
|
|
}
|
|
length := i - pos
|
|
if length >= fdata.length && util.IsBlank(line[i:]) {
|
|
newline := 1
|
|
if line[len(line)-1] != '\n' {
|
|
newline = 0
|
|
}
|
|
reader.Advance(segment.Stop - segment.Start - newline - segment.Padding)
|
|
return Close
|
|
}
|
|
}
|
|
pos, padding := util.DedentPositionPadding(line, reader.LineOffset(), segment.Padding, fdata.indent)
|
|
|
|
seg := text.NewSegmentPadding(segment.Start+pos, segment.Stop, padding)
|
|
node.Lines().Append(seg)
|
|
reader.AdvanceAndSetPadding(segment.Stop-segment.Start-pos-1, padding)
|
|
return Continue | NoChildren
|
|
}
|
|
|
|
func (b *fencedCodeBlockParser) Close(node ast.Node, reader text.Reader, pc Context) {
|
|
fdata := pc.Get(fencedCodeBlockInfoKey).(*fenceData)
|
|
if fdata.node == node {
|
|
pc.Set(fencedCodeBlockInfoKey, nil)
|
|
}
|
|
}
|
|
|
|
func (b *fencedCodeBlockParser) CanInterruptParagraph() bool {
|
|
return true
|
|
}
|
|
|
|
func (b *fencedCodeBlockParser) CanAcceptIndentedLine() bool {
|
|
return false
|
|
}
|
|
|