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