GoToSocial/vendor/github.com/yuin/goldmark/extension/strikethrough.go

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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),
))
}