/*******************************************************************************

    uBlock Origin - a comprehensive, efficient content blocker
    Copyright (C) 2019-present Raymond Hill

    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 {http://www.gnu.org/licenses/}.

    Home: https://github.com/gorhill/uBlock

*/

import { createArglistParser } from './shared.js';
import { registerScriptlet } from './base.js';

/******************************************************************************/

export function parseReplaceFn(s) {
    if ( s.charCodeAt(0) !== 0x2F /* / */ ) { return; }
    const parser = createArglistParser('/');
    parser.nextArg(s, 1);
    let pattern = s.slice(parser.argBeg, parser.argEnd);
    if ( parser.transform ) {
        pattern = parser.normalizeArg(pattern);
    }
    if ( pattern === '' ) { return; }
    parser.nextArg(s, parser.separatorEnd);
    let replacement = s.slice(parser.argBeg, parser.argEnd);
    if ( parser.separatorEnd === parser.separatorBeg ) { return; }
    if ( parser.transform ) {
        replacement = parser.normalizeArg(replacement);
    }
    const flags = s.slice(parser.separatorEnd);
    try {
        return { re: new RegExp(pattern, flags), replacement };
    } catch(_) {
    }
}
registerScriptlet(parseReplaceFn, {
    name: 'parse-replace.fn',
    dependencies: [
        createArglistParser,
    ],
});