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103 lines
3.3 KiB
Go
103 lines
3.3 KiB
Go
package html
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var (
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singleQuoteEntityBytes = []byte("'")
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doubleQuoteEntityBytes = []byte(""")
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)
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// EscapeAttrVal returns the escaped attribute value bytes with quotes. Either single or double quotes are used, whichever is shorter. If there are no quotes present in the value and the value is in HTML (not XML), it will return the value without quotes.
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func EscapeAttrVal(buf *[]byte, orig, b []byte, isXML bool) []byte {
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singles := 0
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doubles := 0
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unquoted := true
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entities := false
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for _, c := range b {
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if charTable[c] {
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unquoted = false
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if c == '"' {
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doubles++
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} else if c == '\'' {
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singles++
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}
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}
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}
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if unquoted && !isXML {
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return b
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} else if !entities && len(orig) == len(b)+2 && (singles == 0 && orig[0] == '\'' || doubles == 0 && orig[0] == '"') {
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return orig
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}
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n := len(b) + 2
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var quote byte
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var escapedQuote []byte
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if singles >= doubles || isXML {
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n += doubles * 4
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quote = '"'
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escapedQuote = doubleQuoteEntityBytes
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} else {
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n += singles * 4
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quote = '\''
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escapedQuote = singleQuoteEntityBytes
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}
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if n > cap(*buf) {
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*buf = make([]byte, 0, n) // maximum size, not actual size
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}
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t := (*buf)[:n] // maximum size, not actual size
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t[0] = quote
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j := 1
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start := 0
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for i, c := range b {
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if c == quote {
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j += copy(t[j:], b[start:i])
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j += copy(t[j:], escapedQuote)
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start = i + 1
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}
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}
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j += copy(t[j:], b[start:])
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t[j] = quote
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return t[:j+1]
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}
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var charTable = [256]bool{
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// ASCII
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false, false, false, false, false, false, false, false,
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false, true, true, false, true, true, false, false, // tab, line feed, form feed, carriage return
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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true, false, true, false, false, false, false, true, // space, "), '
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, true, true, true, false, // <, =, >
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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true, false, false, false, false, false, false, false, // `
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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// non-ASCII
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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false, false, false, false, false, false, false, false,
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}
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