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<?php |
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/** |
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* This file is part of Lexer package. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Railt\Lexer; |
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use Railt\Lexer\Driver\NativeRegex; |
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use Railt\Lexer\Driver\ParleLexer; |
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/** |
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* Class Lexer |
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*/ |
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class Factory |
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{ |
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/** |
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* The factory should return any implementation supporting the PCRE lookahead syntax. |
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* |
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* @var int |
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*/ |
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public const LOOKAHEAD = 0x02; |
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/** |
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* The factory should return any multistate implementation. |
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* |
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* @var int |
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*/ |
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public const MULTISTATE = 0x04; |
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/** |
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* @param array $tokens |
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* @param array $skip |
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* @param int $flags |
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* @return LexerInterface|SimpleLexerInterface|MultistateLexerInterface |
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* @throws Exception\BadLexemeException |
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* @throws \InvalidArgumentException |
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*/ |
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public static function create(array $tokens, array $skip = [], int $flags = self::LOOKAHEAD): LexerInterface |
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{ |
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switch (true) { |
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case self::isMultistate($flags): |
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$error = \vsprintf('Multistate %slexer does not implemented yet', [ |
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self::isLookahead($flags) ? 'lookahead ' : '', |
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]); |
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throw new \InvalidArgumentException($error); |
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case ! self::isLookahead($flags) && \class_exists(\Parle\Lexer::class, false): |
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return new ParleLexer($tokens, $skip); |
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default: |
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return new NativeRegex($tokens, $skip); |
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} |
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} |
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/** |
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* @param int $flags |
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* @return bool |
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*/ |
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private static function isLookahead(int $flags): bool |
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{ |
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return (bool)($flags & self::LOOKAHEAD); |
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} |
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/** |
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* @param int $flags |
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* @return bool |
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*/ |
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private static function isMultistate(int $flags): bool |
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{ |
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return (bool)($flags & self::MULTISTATE); |
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} |
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} |
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railt /
lexer
