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package html
// uses github.com/tdewolff/hasher
//go:generate hasher -type=Hash -file=hash.go
// Hash defines perfect hashes for a predefined list of strings
type Hash uint32
// Identifiers for the hashes associated with the text in the comments.
const (
Iframe Hash = 0x6 // iframe
Math Hash = 0x604 // math
Plaintext Hash = 0x2109 // plaintext
Script Hash = 0xa06 // script
Style Hash = 0x1405 // style
Svg Hash = 0x1903 // svg
Textarea Hash = 0x2608 // textarea
Title Hash = 0xf05 // title
Xml Hash = 0x1c03 // xml
Xmp Hash = 0x1f03 // xmp
)
//var HashMap = map[string]Hash{
// "iframe": Iframe,
// "math": Math,
// "plaintext": Plaintext,
// "script": Script,
// "style": Style,
// "svg": Svg,
// "textarea": Textarea,
// "title": Title,
// "xml": Xml,
// "xmp": Xmp,
//}
// String returns the text associated with the hash.
func (i Hash) String() string {
return string(i.Bytes())
}
// Bytes returns the text associated with the hash.
func (i Hash) Bytes() []byte {
start := uint32(i >> 8)
n := uint32(i & 0xff)
if start+n > uint32(len(_Hash_text)) {
return []byte{}
}
return _Hash_text[start : start+n]
}
// ToHash returns a hash Hash for a given []byte. Hash is a uint32 that is associated with the text in []byte. It returns zero if no match found.
func ToHash(s []byte) Hash {
if len(s) == 0 || len(s) > _Hash_maxLen {
return 0
}
//if 3 < len(s) {
// return HashMap[string(s)]
//}
h := uint32(_Hash_hash0)
for i := 0; i < len(s); i++ {
h ^= uint32(s[i])
h *= 16777619
}
if i := _Hash_table[h&uint32(len(_Hash_table)-1)]; int(i&0xff) == len(s) {
t := _Hash_text[i>>8 : i>>8+i&0xff]
for i := 0; i < len(s); i++ {
if t[i] != s[i] {
goto NEXT
}
}
return i
}
NEXT:
if i := _Hash_table[(h>>16)&uint32(len(_Hash_table)-1)]; int(i&0xff) == len(s) {
t := _Hash_text[i>>8 : i>>8+i&0xff]
for i := 0; i < len(s); i++ {
if t[i] != s[i] {
return 0
}
}
return i
}
return 0
}
const _Hash_hash0 = 0xb4b790b3
const _Hash_maxLen = 9
var _Hash_text = []byte("" +
"iframemathscriptitlestylesvgxmlxmplaintextarea")
var _Hash_table = [1 << 4]Hash{
0x2: 0xa06, // script
0x3: 0xf05, // title
0x4: 0x1405, // style
0x5: 0x604, // math
0x6: 0x6, // iframe
0x8: 0x1c03, // xml
0x9: 0x2608, // textarea
0xc: 0x1f03, // xmp
0xe: 0x2109, // plaintext
0xf: 0x1903, // svg
}
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