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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>
117 lines
3.3 KiB
Go
117 lines
3.3 KiB
Go
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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