HeyPuter/packages/strataparse/parse_impls/StrUntilParserImpl.js

/*
 * Copyright (C) 2024  Puter Technologies Inc.
 *
 * This file is part of Phoenix Shell.
 *
 * Phoenix Shell is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
export default class StrUntilParserImpl {
    constructor ({ stopChars }) {
        this.stopChars = stopChars;
    }
    parse (lexer) {
        let text = '';
        for ( ;; ) {
            let { done, value } = lexer.look();

            if ( done ) break;

            // TODO: doing this strictly one byte at a time
            //       doesn't allow multi-byte stop characters
            if ( typeof value === 'number' ) value =
                String.fromCharCode(value);

            if ( this.stopChars.includes(value) ) break;

            text += value;
            lexer.next();
        }

        if ( text.length === 0 ) return;

        return { $: 'until', text };
    }
}