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