71 lines
1.3 KiB
Go
71 lines
1.3 KiB
Go
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package blackfriday
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import (
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"html"
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"io"
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)
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var htmlEscaper = [256][]byte{
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'&': []byte("&"),
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'<': []byte("<"),
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'>': []byte(">"),
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'"': []byte("""),
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}
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func escapeHTML(w io.Writer, s []byte) {
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escapeEntities(w, s, false)
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}
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func escapeAllHTML(w io.Writer, s []byte) {
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escapeEntities(w, s, true)
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}
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func escapeEntities(w io.Writer, s []byte, escapeValidEntities bool) {
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var start, end int
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for end < len(s) {
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escSeq := htmlEscaper[s[end]]
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if escSeq != nil {
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isEntity, entityEnd := nodeIsEntity(s, end)
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if isEntity && !escapeValidEntities {
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w.Write(s[start : entityEnd+1])
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start = entityEnd + 1
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} else {
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w.Write(s[start:end])
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w.Write(escSeq)
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start = end + 1
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}
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}
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end++
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}
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if start < len(s) && end <= len(s) {
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w.Write(s[start:end])
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}
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}
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func nodeIsEntity(s []byte, end int) (isEntity bool, endEntityPos int) {
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isEntity = false
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endEntityPos = end + 1
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if s[end] == '&' {
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for endEntityPos < len(s) {
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if s[endEntityPos] == ';' {
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if entities[string(s[end:endEntityPos+1])] {
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isEntity = true
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break
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}
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}
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if !isalnum(s[endEntityPos]) && s[endEntityPos] != '&' && s[endEntityPos] != '#' {
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break
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}
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endEntityPos++
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}
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}
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return isEntity, endEntityPos
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}
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func escLink(w io.Writer, text []byte) {
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unesc := html.UnescapeString(string(text))
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escapeHTML(w, []byte(unesc))
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}
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