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117 lines
3.3 KiB
117 lines
3.3 KiB
package extension
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import (
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"github.com/yuin/goldmark"
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gast "github.com/yuin/goldmark/ast"
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"github.com/yuin/goldmark/extension/ast"
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"github.com/yuin/goldmark/parser"
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"github.com/yuin/goldmark/renderer"
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"github.com/yuin/goldmark/renderer/html"
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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 strikethroughDelimiterProcessor struct {
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}
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func (p *strikethroughDelimiterProcessor) IsDelimiter(b byte) bool {
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return b == '~'
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}
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func (p *strikethroughDelimiterProcessor) CanOpenCloser(opener, closer *parser.Delimiter) bool {
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return opener.Char == closer.Char
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}
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func (p *strikethroughDelimiterProcessor) OnMatch(consumes int) gast.Node {
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return ast.NewStrikethrough()
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}
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var defaultStrikethroughDelimiterProcessor = &strikethroughDelimiterProcessor{}
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type strikethroughParser struct {
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}
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var defaultStrikethroughParser = &strikethroughParser{}
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// NewStrikethroughParser return a new InlineParser that parses
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// strikethrough expressions.
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func NewStrikethroughParser() parser.InlineParser {
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return defaultStrikethroughParser
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}
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func (s *strikethroughParser) Trigger() []byte {
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return []byte{'~'}
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}
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func (s *strikethroughParser) Parse(parent gast.Node, block text.Reader, pc parser.Context) gast.Node {
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before := block.PrecendingCharacter()
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line, segment := block.PeekLine()
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node := parser.ScanDelimiter(line, before, 2, defaultStrikethroughDelimiterProcessor)
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if node == nil {
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return nil
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}
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node.Segment = segment.WithStop(segment.Start + node.OriginalLength)
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block.Advance(node.OriginalLength)
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pc.PushDelimiter(node)
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return node
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}
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func (s *strikethroughParser) CloseBlock(parent gast.Node, pc parser.Context) {
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// nothing to do
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}
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// StrikethroughHTMLRenderer is a renderer.NodeRenderer implementation that
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// renders Strikethrough nodes.
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type StrikethroughHTMLRenderer struct {
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html.Config
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}
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// NewStrikethroughHTMLRenderer returns a new StrikethroughHTMLRenderer.
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func NewStrikethroughHTMLRenderer(opts ...html.Option) renderer.NodeRenderer {
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r := &StrikethroughHTMLRenderer{
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Config: html.NewConfig(),
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}
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for _, opt := range opts {
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opt.SetHTMLOption(&r.Config)
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}
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return r
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}
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// RegisterFuncs implements renderer.NodeRenderer.RegisterFuncs.
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func (r *StrikethroughHTMLRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
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reg.Register(ast.KindStrikethrough, r.renderStrikethrough)
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}
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// StrikethroughAttributeFilter defines attribute names which dd elements can have.
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var StrikethroughAttributeFilter = html.GlobalAttributeFilter
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func (r *StrikethroughHTMLRenderer) renderStrikethrough(w util.BufWriter, source []byte, n gast.Node, entering bool) (gast.WalkStatus, error) {
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if entering {
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if n.Attributes() != nil {
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_, _ = w.WriteString("<del")
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html.RenderAttributes(w, n, StrikethroughAttributeFilter)
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_ = w.WriteByte('>')
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} else {
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_, _ = w.WriteString("<del>")
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}
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} else {
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_, _ = w.WriteString("</del>")
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}
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return gast.WalkContinue, nil
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}
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type strikethrough struct {
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}
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// Strikethrough is an extension that allow you to use strikethrough expression like '~~text~~' .
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var Strikethrough = &strikethrough{}
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func (e *strikethrough) Extend(m goldmark.Markdown) {
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m.Parser().AddOptions(parser.WithInlineParsers(
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util.Prioritized(NewStrikethroughParser(), 500),
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))
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m.Renderer().AddOptions(renderer.WithNodeRenderers(
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util.Prioritized(NewStrikethroughHTMLRenderer(), 500),
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))
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}
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