/*
 * NoScript - a Firefox extension for whitelist driven safe JavaScript execution
 *
 * Copyright (C) 2005-2021 Giorgio Maone <https://maone.net>
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */

var Entities = {
  get htmlNode() {
    delete this.htmlNode;
    return this.htmlNode = document.implementation.createHTMLDocument("")
      .createElement("body");
  },
  convert: function(e) {
    try {
      this.htmlNode.innerHTML = e;
      var child = this.htmlNode.firstChild || null;
      return child && child.nodeValue || e;
    } catch(ex) {
      return e;
    }
  },
  convertAll: function(s) {
    return s.replace(/[\\&][^<>]+/g, function(e) { return Entities.convert(e) });
  },
  convertDeep: function(s) {
    for (var prev = null; (s = this.convertAll(s)) !== prev || (s = unescape(s)) !== prev; prev = s);
    return s;
  },
  neutralize: function(e, whitelist) {
    var c = this.convert(e);
    return (c == e) ? c : (whitelist && whitelist.test(c) ? e : e.replace(";", ","));
  },
  neutralizeAll: function(s, whitelist) {
    return s.replace(/&[\w#-]*?;/g, function(e) { return Entities.neutralize(e, whitelist || null); });
  }
};