package blackfriday

import (

	"html"

	"io"

)

var htmlEscaper = [256][]byte{

	'&': []byte("&"),

	'<': []byte("&lt;"),

	'>': []byte(">"),

	'"': []byte("""),

}

func escapeHTML(w io.Writer, s []byte) {

	var start, end int

	for end < len(s) {

		escSeq := htmlEscaper[s[end]]

		if escSeq != nil {

			w.Write(s[start:end])

			w.Write(escSeq)

			start = end + 1

		}

		end++

	}

	if start < len(s) && end <= len(s) {

		w.Write(s[start:end])

	}

}

func escLink(w io.Writer, text []byte) {

	unesc := html.UnescapeString(string(text))

	escapeHTML(w, []byte(unesc))

}