mirror of
https://github.com/yuin/goldmark
synced 2025-03-04 23:04:52 +00:00
125 lines
2.9 KiB
Go
125 lines
2.9 KiB
Go
package extension
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import (
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"bytes"
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"github.com/yuin/goldmark"
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"github.com/yuin/goldmark/ast"
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"github.com/yuin/goldmark/parser"
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"github.com/yuin/goldmark/text"
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"github.com/yuin/goldmark/util"
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"regexp"
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)
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var wwwURLRegxp = regexp.MustCompile(`^www\.[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b(?:[-a-zA-Z0-9@:%_\+.~#?&//=\(\);]*)`)
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var urlRegexp = regexp.MustCompile(`^(?:http|https|ftp):\/\/(?:www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=\(\);]*)`)
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var emailRegexp = regexp.MustCompile(`^[a-zA-Z0-9\.\-_\+]+@([a-zA-Z0-9\.\-_]+)`)
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type linkifyParser struct {
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}
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var defaultLinkifyParser = &linkifyParser{}
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// NewLinkifyParser return a new InlineParser can parse
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// text that seems like a URL.
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func NewLinkifyParser() parser.InlineParser {
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return defaultLinkifyParser
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}
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func (s *linkifyParser) Trigger() []byte {
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// ' ' indicates any white spaces and a line head
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return []byte{' ', '*', '_', '~', '('}
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}
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func (s *linkifyParser) Parse(parent ast.Node, block text.Reader, pc parser.Context) ast.Node {
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line, segment := block.PeekLine()
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consumes := 0
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start := segment.Start
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c := line[0]
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// advance if current position is not a line head.
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if c == ' ' || c == '*' || c == '_' || c == '~' || c == '(' {
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consumes++
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start++
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line = line[1:]
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}
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var m []int
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typ := ast.AutoLinkType(ast.AutoLinkEmail)
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typ = ast.AutoLinkURL
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m = urlRegexp.FindSubmatchIndex(line)
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if m == nil {
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m = wwwURLRegxp.FindSubmatchIndex(line)
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}
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if m != nil {
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lastChar := line[m[1]-1]
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if lastChar == '.' {
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m[1]--
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} else if lastChar == ')' {
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closing := 0
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for i := m[1] - 1; i >= m[0]; i-- {
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if line[i] == ')' {
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closing++
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} else if line[i] == '(' {
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closing--
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}
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}
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if closing > 0 {
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m[1]--
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}
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} else if lastChar == ';' {
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i := m[1] - 2
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for ; i >= m[0]; i-- {
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if util.IsAlphaNumeric(line[i]) {
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continue
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}
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break
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}
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if i != m[1]-2 {
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if line[i] == '&' {
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m[1] -= m[1] - i
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}
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}
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}
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}
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if m == nil {
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typ = ast.AutoLinkEmail
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m = emailRegexp.FindSubmatchIndex(line)
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if m == nil || bytes.IndexByte(line[m[2]:m[3]], '.') < 0 {
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return nil
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}
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lastChar := line[m[1]-1]
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if lastChar == '.' {
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m[1]--
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} else if lastChar == '-' || lastChar == '_' {
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return nil
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}
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}
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if m == nil {
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return nil
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}
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if consumes != 0 {
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s := segment.WithStop(segment.Start + 1)
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ast.MergeOrAppendTextSegment(parent, s)
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}
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consumes += m[1]
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block.Advance(consumes)
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n := ast.NewTextSegment(text.NewSegment(start, start+m[1]))
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return ast.NewAutoLink(typ, n)
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}
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func (s *linkifyParser) CloseBlock(parent ast.Node, pc parser.Context) {
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// nothing to do
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}
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type linkify struct {
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}
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// Linkify is an extension that allow you to parse text that seems like a URL.
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var Linkify = &linkify{}
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func (e *linkify) Extend(m goldmark.Markdown) {
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m.Parser().AddOption(parser.WithInlineParsers(
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util.Prioritized(NewLinkifyParser(), 999),
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))
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}
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