27757714d0
* Move to goldmark Markdown rendering moved from blackfriday to the goldmark. Multiple subtle changes required to the goldmark extensions to keep current rendering and defaults. Can go further with goldmark linkify and have this work within markdown rendering making the link processor unnecessary. Need to think about how to go about allowing extensions - at present it seems that these would be hard to do without recompilation. * linter fixes Co-authored-by: Lauris BH <lauris@nix.lv>
110 lines
2.9 KiB
Go
Vendored
110 lines
2.9 KiB
Go
Vendored
package parser
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import (
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"bytes"
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"github.com/yuin/goldmark/ast"
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"github.com/yuin/goldmark/text"
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"github.com/yuin/goldmark/util"
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)
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type fencedCodeBlockParser struct {
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}
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var defaultFencedCodeBlockParser = &fencedCodeBlockParser{}
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// NewFencedCodeBlockParser returns a new BlockParser that
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// parses fenced code blocks.
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func NewFencedCodeBlockParser() BlockParser {
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return defaultFencedCodeBlockParser
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}
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type fenceData struct {
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char byte
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indent int
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length int
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node ast.Node
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}
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var fencedCodeBlockInfoKey = NewContextKey()
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func (b *fencedCodeBlockParser) Trigger() []byte {
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return []byte{'~', '`'}
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}
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func (b *fencedCodeBlockParser) Open(parent ast.Node, reader text.Reader, pc Context) (ast.Node, State) {
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line, segment := reader.PeekLine()
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pos := pc.BlockOffset()
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if pos < 0 || (line[pos] != '`' && line[pos] != '~') {
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return nil, NoChildren
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}
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findent := pos
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fenceChar := line[pos]
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i := pos
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for ; i < len(line) && line[i] == fenceChar; i++ {
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}
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oFenceLength := i - pos
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if oFenceLength < 3 {
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return nil, NoChildren
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}
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var info *ast.Text
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if i < len(line)-1 {
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rest := line[i:]
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left := util.TrimLeftSpaceLength(rest)
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right := util.TrimRightSpaceLength(rest)
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if left < len(rest)-right {
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infoStart, infoStop := segment.Start-segment.Padding+i+left, segment.Stop-right
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value := rest[left : len(rest)-right]
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if fenceChar == '`' && bytes.IndexByte(value, '`') > -1 {
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return nil, NoChildren
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} else if infoStart != infoStop {
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info = ast.NewTextSegment(text.NewSegment(infoStart, infoStop))
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}
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}
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}
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node := ast.NewFencedCodeBlock(info)
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pc.Set(fencedCodeBlockInfoKey, &fenceData{fenceChar, findent, oFenceLength, node})
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return node, NoChildren
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}
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func (b *fencedCodeBlockParser) Continue(node ast.Node, reader text.Reader, pc Context) State {
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line, segment := reader.PeekLine()
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fdata := pc.Get(fencedCodeBlockInfoKey).(*fenceData)
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w, pos := util.IndentWidth(line, reader.LineOffset())
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if w < 4 {
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i := pos
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for ; i < len(line) && line[i] == fdata.char; i++ {
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}
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length := i - pos
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if length >= fdata.length && util.IsBlank(line[i:]) {
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newline := 1
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if line[len(line)-1] != '\n' {
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newline = 0
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}
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reader.Advance(segment.Stop - segment.Start - newline - segment.Padding)
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return Close
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}
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}
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pos, padding := util.DedentPositionPadding(line, reader.LineOffset(), segment.Padding, fdata.indent)
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seg := text.NewSegmentPadding(segment.Start+pos, segment.Stop, padding)
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node.Lines().Append(seg)
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reader.AdvanceAndSetPadding(segment.Stop-segment.Start-pos-1, padding)
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return Continue | NoChildren
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}
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func (b *fencedCodeBlockParser) Close(node ast.Node, reader text.Reader, pc Context) {
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fdata := pc.Get(fencedCodeBlockInfoKey).(*fenceData)
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if fdata.node == node {
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pc.Set(fencedCodeBlockInfoKey, nil)
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}
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}
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func (b *fencedCodeBlockParser) CanInterruptParagraph() bool {
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return true
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}
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func (b *fencedCodeBlockParser) CanAcceptIndentedLine() bool {
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return false
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}
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