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/*
* This file is part of Adblock Plus <https://adblockplus.org/>,
* Copyright (C) 2006-2017 eyeo GmbH
*
* Adblock Plus is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* Adblock Plus 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 Adblock Plus. If not, see <http://www.gnu.org/licenses/>.
*/
// We are currently limited to ECMAScript 5 in this file, because it is being
// used in the browser tests. See https://issues.adblockplus.org/ticket/4796
/**
* Converts filter text into regular expression string
* @param {string} text as in Filter()
* @return {string} regular expression representation of filter text
*/
function filterToRegExp(text)
{
return text
// remove multiple wildcards
.replace(/\*+/g, "*")
// remove anchors following separator placeholder
.replace(/\^\|$/, "^")
// escape special symbols
.replace(/\W/g, "\\$&")
// replace wildcards by .*
.replace(/\\\*/g, ".*")
// process separator placeholders (all ANSI characters but alphanumeric
// characters and _%.-)
.replace(/\\\^/g, "(?:[\\x00-\\x24\\x26-\\x2C\\x2F\\x3A-\\x40\\x5B-\\x5E\\x60\\x7B-\\x7F]|$)")
// process extended anchor at expression start
.replace(/^\\\|\\\|/, "^[\\w\\-]+:\\/+(?!\\/)(?:[^\\/]+\\.)?")
// process anchor at expression start
.replace(/^\\\|/, "^")
// process anchor at expression end
.replace(/\\\|$/, "$")
// remove leading wildcards
.replace(/^(\.\*)/, "")
// remove trailing wildcards
.replace(/(\.\*)$/, "");
}
if (typeof exports != "undefined")
exports.filterToRegExp = filterToRegExp;
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