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// Copyright 2015 The Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package linkify
import (
"unicode"
"unicode/utf8"
)
func findEmailStart(s string, start int) (_ int, _ bool) {
end := start
allowDot := false
for end >= 0 {
b := s[end]
switch {
case emailcs[b]:
allowDot = true
case b == '.':
if !allowDot {
return
}
allowDot = false
default:
if end == start {
return
}
if s[end+1] == '.' {
return
}
r, _ := utf8.DecodeLastRuneInString(s[:end+1])
if r == utf8.RuneError {
return
}
if !unicode.IsSpace(r) {
return
}
return end + 1, true
}
end--
}
if end < start && s[end+1] == '.' {
return
}
return end + 1, true
}
func findEmailEnd(s string, start int) (_ int, _ bool) {
end := start
allowDot := false
loop:
for end < len(s) {
b := s[end]
switch {
case emailcs[b]:
allowDot = true
case b == '.':
if !allowDot {
return
}
allowDot = false
case b == '@':
break loop
default:
return
}
end++
}
if end >= len(s)-5 {
return
}
if end > start && s[end-1] == '.' {
return
}
var dot int
var ok bool
end, dot, ok = findHostnameEnd(s, end+1)
if !ok || dot == -1 {
return
}
if dot+5 <= len(s) && s[dot+1:dot+5] == "xn--" {
return end, true
}
if length := match(s[dot+1:]); dot+length+1 != end {
return
}
return end, true
}
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