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xml: add Escape, copied from template.HTMLEscape.
R=rsc CC=golang-dev https://golang.org/cl/186282
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commit
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@ -1479,3 +1479,38 @@ var htmlAutoClose = []string{
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"base",
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"meta",
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}
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var (
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esc_quot = strings.Bytes(""") // shorter than """
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esc_apos = strings.Bytes("'") // shorter than "'"
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esc_amp = strings.Bytes("&")
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esc_lt = strings.Bytes("<")
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esc_gt = strings.Bytes(">")
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)
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// Escape writes to w the properly escaped XML equivalent
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// of the plain text data s.
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func Escape(w io.Writer, s []byte) {
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var esc []byte
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last := 0
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for i, c := range s {
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switch c {
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case '"':
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esc = esc_quot
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case '\'':
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esc = esc_apos
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case '&':
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esc = esc_amp
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case '<':
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esc = esc_lt
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case '>':
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esc = esc_gt
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default:
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continue
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}
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w.Write(s[last:i])
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w.Write(esc)
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last = i + 1
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}
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w.Write(s[last:])
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}
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