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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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} |