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103 lines
1.8 KiB
103 lines
1.8 KiB
'use strict';
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var extend = require('extend-shallow');
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var regexCache = {};
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var all;
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var charSets = {
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default: {
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'"': '"',
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'"': '"',
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''': '\'',
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''': '\'',
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'&': '&',
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'&': '&',
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'>': '>',
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'>': '>',
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'<': '<',
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'<': '<'
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},
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extras: {
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'¢': '¢',
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'¢': '¢',
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'©': '©',
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'©': '©',
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'€': '€',
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'€': '€',
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'£': '£',
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'£': '£',
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'®': '®',
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'®': '®',
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'¥': '¥',
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'¥': '¥'
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}
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};
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// don't merge char sets unless "all" is explicitly called
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Object.defineProperty(charSets, 'all', {
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get: function() {
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return all || (all = extend({}, charSets.default, charSets.extras));
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}
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});
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/**
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* Convert HTML entities to HTML characters.
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*
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* @param {String} `str` String with HTML entities to un-escape.
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* @return {String}
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*/
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function unescape(str, type) {
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if (!isString(str)) return '';
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var chars = charSets[type || 'default'];
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var regex = toRegex(type, chars);
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return str.replace(regex, function(m) {
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return chars[m];
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});
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}
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function toRegex(type, chars) {
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if (regexCache[type]) {
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return regexCache[type];
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}
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var keys = Object.keys(chars).join('|');
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var regex = new RegExp('(?=(' + keys + '))\\1', 'g');
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regexCache[type] = regex;
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return regex;
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}
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/**
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* Returns true if str is a non-empty string
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*/
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function isString(str) {
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return str && typeof str === 'string';
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}
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/**
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* Expose charSets
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*/
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unescape.chars = charSets.default;
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unescape.extras = charSets.extras;
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// don't trip the "charSets" getter unless it's explicitly called
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Object.defineProperty(unescape, 'all', {
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get: function() {
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return charSets.all;
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}
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});
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/**
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* Expose `unescape`
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*/
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module.exports = unescape;
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