func matchTagName(s string) string {
if len(s) < 2 {
return ""
}
i := 0
if s[0] == '/' {
i++
}
start := i
max := min(15+i, len(s))
for i < max && byteutil.IsLetter(s[i]) {
i++
}
if i >= len(s) {
return ""
}
switch s[i] {
case ' ', '\n', '/', '>':
return byteutil.ToLower(s[start:i])
default:
return ""
}
}
func matchAutolink(s string) string {
if len(s) < 6 || s[0] != '<' {
return ""
}
st := 0
n := 0
for i := 1; i < len(s); i++ {
b := s[i]
switch st {
case 0: // initial state
switch {
case schemecs[b]:
st = 1
n++
default:
return ""
}
case 1: // h
switch {
case schemecs[b]:
n++
if n > 23 {
return ""
}
case b == ':':
schema := byteutil.ToLower(s[1:i])
if !matchSchema(schema) {
return ""
}
st = 2
default:
return ""
}
case 2: // http:
switch {
case linkcs[b]:
st = 3
break
default:
return ""
}
case 3: // http:/
switch {
case linkcs[b]:
break
case b == '>':
return s[1:i]
default:
return ""
}
}
}
return ""
}
// Parse parses rawurl into a URL structure.
func Parse(rawurl string) (*URL, error) {
n, err := findScheme(rawurl)
if err != nil {
return nil, err
}
var url URL
rest := rawurl
hostless := false
if n > 0 {
url.Scheme, rest = byteutil.ToLower(rest[:n]), rest[n+1:]
if url.Scheme == "javascript" {
hostless = true
}
}
if !hostless && strings.HasPrefix(rest, "//") {
url.Slashes, rest = true, rest[2:]
}
if !hostless && (url.Slashes || (url.Scheme != "" && !slashedProtocol[url.Scheme])) {
hostEnd := byteutil.IndexAnyTable(rest, &cs2)
atSign := -1
i := hostEnd
if i == -1 {
i = len(rest) - 1
}
for i >= 0 {
if rest[i] == '@' {
atSign = i
break
}
i--
}
if atSign != -1 {
url.Auth, rest = rest[:atSign], rest[atSign+1:]
}
hostEnd = byteutil.IndexAnyTable(rest, &cs3)
if hostEnd == -1 {
hostEnd = len(rest)
}
if hostEnd > 0 && hostEnd < len(rest) && rest[hostEnd-1] == ':' {
hostEnd--
}
host := rest[:hostEnd]
if len(host) > 1 {
b := host[hostEnd-1]
if byteutil.IsDigit(b) {
for i := len(host) - 2; i >= 0; i-- {
b := host[i]
if b == ':' {
url.Host, url.Port = host[:i], host[i+1:]
break
}
if !byteutil.IsDigit(b) {
break
}
}
} else if b == ':' {
host = host[:hostEnd-1]
hostEnd--
}
}
if url.Port == "" {
url.Host = host
}
rest = rest[hostEnd:]
if ipv6 := len(url.Host) > 2 &&
url.Host[0] == '[' &&
url.Host[len(url.Host)-1] == ']'; ipv6 {
url.Host = url.Host[1 : len(url.Host)-1]
url.IPv6 = true
} else if i := strings.IndexByte(url.Host, ':'); i >= 0 {
url.Host, rest = url.Host[:i], url.Host[i:]+rest
}
}
rest, url.Fragment = split(rest, '#')
url.Path, url.RawQuery = split(rest, '?')
return &url, nil
}