HORIZON PROJECT

var toString = require('./toString'),

    unescapeHtmlChar = require('./_unescapeHtmlChar');

/** Used to match HTML entities and HTML characters. */

var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,

    reHasEscapedHtml = RegExp(reEscapedHtml.source);

/**

 * The inverse of `_.escape`; this method converts the HTML entities

 * `&`, `<`, `>`, `"`, and `'` in `string` to

 * their corresponding characters.

 *

 * **Note:** No other HTML entities are unescaped. To unescape additional

 * HTML entities use a third-party library like [_he_](https://mths.be/he).

 *

 * @static

 * @memberOf _

 * @since 0.6.0

 * @category String

 * @param {string} [string=''] The string to unescape.

 * @returns {string} Returns the unescaped string.

 * @example

 *

 * _.unescape('fred, barney, & pebbles');

 * // => 'fred, barney, & pebbles'

 */

function unescape(string) {

  string = toString(string);

  return (string && reHasEscapedHtml.test(string))

    ? string.replace(reEscapedHtml, unescapeHtmlChar)

    : string;

}

module.exports = unescape;