127 lines
3 KiB
Go
127 lines
3 KiB
Go
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package parser
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import (
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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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var temporaryParagraphKey = NewContextKey()
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type setextHeadingParser struct {
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HeadingConfig
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}
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func matchesSetextHeadingBar(line []byte) (byte, bool) {
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start := 0
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end := len(line)
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space := util.TrimLeftLength(line, []byte{' '})
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if space > 3 {
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return 0, false
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}
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start += space
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level1 := util.TrimLeftLength(line[start:end], []byte{'='})
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c := byte('=')
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var level2 int
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if level1 == 0 {
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level2 = util.TrimLeftLength(line[start:end], []byte{'-'})
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c = '-'
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}
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if util.IsSpace(line[end-1]) {
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end -= util.TrimRightSpaceLength(line[start:end])
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}
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if !((level1 > 0 && start+level1 == end) || (level2 > 0 && start+level2 == end)) {
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return 0, false
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}
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return c, true
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}
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// NewSetextHeadingParser return a new BlockParser that can parse Setext headings.
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func NewSetextHeadingParser(opts ...HeadingOption) BlockParser {
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p := &setextHeadingParser{}
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for _, o := range opts {
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o.SetHeadingOption(&p.HeadingConfig)
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}
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return p
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}
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func (b *setextHeadingParser) Trigger() []byte {
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return []byte{'-', '='}
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}
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func (b *setextHeadingParser) Open(parent ast.Node, reader text.Reader, pc Context) (ast.Node, State) {
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last := pc.LastOpenedBlock().Node
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if last == nil {
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return nil, NoChildren
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}
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paragraph, ok := last.(*ast.Paragraph)
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if !ok || paragraph.Parent() != parent {
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return nil, NoChildren
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}
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line, segment := reader.PeekLine()
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c, ok := matchesSetextHeadingBar(line)
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if !ok {
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return nil, NoChildren
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}
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level := 1
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if c == '-' {
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level = 2
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}
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node := ast.NewHeading(level)
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node.Lines().Append(segment)
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pc.Set(temporaryParagraphKey, last)
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return node, NoChildren | RequireParagraph
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}
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func (b *setextHeadingParser) Continue(node ast.Node, reader text.Reader, pc Context) State {
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return Close
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}
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func (b *setextHeadingParser) Close(node ast.Node, reader text.Reader, pc Context) {
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heading := node.(*ast.Heading)
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segment := node.Lines().At(0)
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heading.Lines().Clear()
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tmp := pc.Get(temporaryParagraphKey).(*ast.Paragraph)
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pc.Set(temporaryParagraphKey, nil)
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if tmp.Lines().Len() == 0 {
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next := heading.NextSibling()
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segment = segment.TrimLeftSpace(reader.Source())
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if next == nil || !ast.IsParagraph(next) {
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para := ast.NewParagraph()
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para.Lines().Append(segment)
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heading.Parent().InsertAfter(heading.Parent(), heading, para)
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} else {
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next.(ast.Node).Lines().Unshift(segment)
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}
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heading.Parent().RemoveChild(heading.Parent(), heading)
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} else {
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heading.SetLines(tmp.Lines())
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heading.SetBlankPreviousLines(tmp.HasBlankPreviousLines())
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tp := tmp.Parent()
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if tp != nil {
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tp.RemoveChild(tp, tmp)
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}
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}
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if b.Attribute {
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parseLastLineAttributes(node, reader, pc)
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}
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if b.AutoHeadingID {
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id, ok := node.AttributeString("id")
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if !ok {
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generateAutoHeadingID(heading, reader, pc)
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} else {
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pc.IDs().Put(id.([]byte))
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}
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}
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}
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func (b *setextHeadingParser) CanInterruptParagraph() bool {
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return true
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}
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func (b *setextHeadingParser) CanAcceptIndentedLine() bool {
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return false
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}
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