// EscapeAttrVal returns the escape attribute value bytes without quotes.
func EscapeAttrVal(buf *[]byte, b []byte) []byte {
singles := 0
doubles := 0
for i, c := range b {
if c == '&' {
if quote, n := parse.QuoteEntity(b[i:]); n > 0 {
if quote == '"' {
doubles++
} else {
singles++
}
}
} else if c == '"' {
doubles++
} else if c == '\'' {
singles++
}
}
n := len(b) + 2
var quote byte
var escapedQuote []byte
if doubles > singles {
n += singles * 4
quote = '\''
escapedQuote = singleQuoteEntityBytes
} else {
n += doubles * 4
quote = '"'
escapedQuote = doubleQuoteEntityBytes
}
if n > cap(*buf) {
*buf = make([]byte, 0, n) // maximum size, not actual size
}
t := (*buf)[:n] // maximum size, not actual size
t[0] = quote
j := 1
start := 0
for i, c := range b {
if c == '&' {
if entityQuote, n := parse.QuoteEntity(b[i:]); n > 0 {
j += copy(t[j:], b[start:i])
if entityQuote != quote {
t[j] = entityQuote
j++
} else {
j += copy(t[j:], escapedQuote)
}
start = i + n
}
} else if c == quote {
j += copy(t[j:], b[start:i])
j += copy(t[j:], escapedQuote)
start = i + 1
}
}
j += copy(t[j:], b[start:])
t[j] = quote
return t[:j+1]
}
// EscapeAttrVal returns the escaped attribute value bytes without quotes.
func EscapeAttrVal(buf *[]byte, orig, b []byte) []byte {
singles := 0
doubles := 0
unquoted := true
entities := false
for i, c := range b {
if charTable[c] {
if c == '&' {
entities = true
if quote, n := parse.QuoteEntity(b[i:]); n > 0 {
if quote == '"' {
unquoted = false
doubles++
} else {
unquoted = false
singles++
}
}
} else {
unquoted = false
if c == '"' {
doubles++
} else if c == '\'' {
singles++
}
}
}
}
if unquoted {
return b
} else if !entities && len(orig) == len(b)+2 && (singles == 0 && orig[0] == '\'' || doubles == 0 && orig[0] == '"') {
return orig
}
n := len(b) + 2
var quote byte
var escapedQuote []byte
if doubles > singles {
n += singles * 4
quote = '\''
escapedQuote = singleQuoteEntityBytes
} else {
n += doubles * 4
quote = '"'
escapedQuote = doubleQuoteEntityBytes
}
if n > cap(*buf) {
*buf = make([]byte, 0, n) // maximum size, not actual size
}
t := (*buf)[:n] // maximum size, not actual size
t[0] = quote
j := 1
start := 0
for i, c := range b {
if c == '&' {
if entityQuote, n := parse.QuoteEntity(b[i:]); n > 0 {
j += copy(t[j:], b[start:i])
if entityQuote != quote {
t[j] = entityQuote
j++
} else {
j += copy(t[j:], escapedQuote)
}
start = i + n
}
} else if c == quote {
j += copy(t[j:], b[start:i])
j += copy(t[j:], escapedQuote)
start = i + 1
}
}
j += copy(t[j:], b[start:])
t[j] = quote
return t[:j+1]
}