Subversion-Projekte lars-tiefland.laravel_shop

<?php

declare(strict_types=1);

namespace Dotenv\Parser;

final class Lexer

{

    /**

     * The regex for each type of token.

     */

    private const PATTERNS = [

        '[\r\n]{1,1000}', '[^\S\r\n]{1,1000}', '\\\\', '\'', '"', '\\#', '\\$', '([^(\s\\\\\'"\\#\\$)]|\\(|\\)){1,1000}',

    ];

    /**

     * This class is a singleton.

     *

     * @codeCoverageIgnore

     *

     * @return void

     */

    private function __construct()

    {

        //

    }

    /**

     * Convert content into a token stream.

     *

     * Multibyte string processing is not needed here, and nether is error

     * handling, for performance reasons.

     *

     * @param string $content

     *

     * @return \Generator<string>

     */

    public static function lex(string $content)

    {

        static $regex;

        if ($regex === null) {

            $regex = '(('.\implode(')|(', self::PATTERNS).'))A';

        }

        $offset = 0;

        while (isset($content[$offset])) {

            if (!\preg_match($regex, $content, $matches, 0, $offset)) {

                throw new \Error(\sprintf('Lexer encountered unexpected character [%s].', $content[$offset]));

            }

            $offset += \strlen($matches[0]);

            yield $matches[0];

        }

    }

}