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// Copyright 2019 Yusuke Inuzuka
// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
// Most of this file is a subtly changed version of github.com/yuin/goldmark/extension/linkify.go
package common
import (
"bytes"
"regexp"
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/ast"
"github.com/yuin/goldmark/parser"
"github.com/yuin/goldmark/text"
"github.com/yuin/goldmark/util"
)
var wwwURLRegxp = regexp.MustCompile(`^www\.[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}((?:/|[#?])[-a-zA-Z0-9@:%_\+.~#!?&//=\(\);,'">\^{}\[\]` + "`" + `]*)?`)
type linkifyParser struct {
}
var defaultLinkifyParser = &linkifyParser{}
// NewLinkifyParser return a new InlineParser can parse
// text that seems like a URL.
func NewLinkifyParser() parser.InlineParser {
return defaultLinkifyParser
}
func (s *linkifyParser) Trigger() []byte {
// ' ' indicates any white spaces and a line head
return []byte{' ', '*', '_', '~', '('}
}
var protoHTTP = []byte("http:")
var protoHTTPS = []byte("https:")
var protoFTP = []byte("ftp:")
var domainWWW = []byte("www.")
func (s *linkifyParser) Parse(parent ast.Node, block text.Reader, pc parser.Context) ast.Node {
if pc.IsInLinkLabel() {
return nil
}
line, segment := block.PeekLine()
consumes := 0
start := segment.Start
c := line[0]
// advance if current position is not a line head.
if c == ' ' || c == '*' || c == '_' || c == '~' || c == '(' {
consumes++
start++
line = line[1:]
}
var m []int
var protocol []byte
var typ ast.AutoLinkType = ast.AutoLinkURL
if bytes.HasPrefix(line, protoHTTP) || bytes.HasPrefix(line, protoHTTPS) || bytes.HasPrefix(line, protoFTP) {
m = LinkRegex.FindSubmatchIndex(line)
}
if m == nil && bytes.HasPrefix(line, domainWWW) {
m = wwwURLRegxp.FindSubmatchIndex(line)
protocol = []byte("http")
}
if m != nil {
lastChar := line[m[1]-1]
if lastChar == '.' {
m[1]--
} else if lastChar == ')' {
closing := 0
for i := m[1] - 1; i >= m[0]; i-- {
if line[i] == ')' {
closing++
} else if line[i] == '(' {
closing--
}
}
if closing > 0 {
m[1] -= closing
}
} else if lastChar == ';' {
i := m[1] - 2
for ; i >= m[0]; i-- {
if util.IsAlphaNumeric(line[i]) {
continue
}
break
}
if i != m[1]-2 {
if line[i] == '&' {
m[1] -= m[1] - i
}
}
}
}
if m == nil {
if len(line) > 0 && util.IsPunct(line[0]) {
return nil
}
typ = ast.AutoLinkEmail
stop := util.FindEmailIndex(line)
if stop < 0 {
return nil
}
at := bytes.IndexByte(line, '@')
m = []int{0, stop, at, stop - 1}
if bytes.IndexByte(line[m[2]:m[3]], '.') < 0 {
return nil
}
lastChar := line[m[1]-1]
if lastChar == '.' {
m[1]--
}
if m[1] < len(line) {
nextChar := line[m[1]]
if nextChar == '-' || nextChar == '_' {
return nil
}
}
}
if m == nil {
return nil
}
if consumes != 0 {
s := segment.WithStop(segment.Start + 1)
ast.MergeOrAppendTextSegment(parent, s)
}
consumes += m[1]
block.Advance(consumes)
n := ast.NewTextSegment(text.NewSegment(start, start+m[1]))
link := ast.NewAutoLink(typ, n)
link.Protocol = protocol
return link
}
func (s *linkifyParser) CloseBlock(parent ast.Node, pc parser.Context) {
// nothing to do
}
type linkify struct {
}
// Linkify is an extension that allow you to parse text that seems like a URL.
var Linkify = &linkify{}
func (e *linkify) Extend(m goldmark.Markdown) {
m.Parser().AddOptions(
parser.WithInlineParsers(
util.Prioritized(NewLinkifyParser(), 999),
),
)
}
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