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<?php
/* * This file is part of Psy Shell. * * (c) 2012-2020 Justin Hileman * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */
namespace Psy;
use PhpParser\Lexer; use PhpParser\Parser; use PhpParser\ParserFactory as OriginalParserFactory;
/** * Parser factory to abstract over PHP parser library versions. */ class ParserFactory { const ONLY_PHP5 = 'ONLY_PHP5'; const ONLY_PHP7 = 'ONLY_PHP7'; const PREFER_PHP5 = 'PREFER_PHP5'; const PREFER_PHP7 = 'PREFER_PHP7';
/** * Possible kinds of parsers for the factory, from PHP parser library. * * @return array */ public static function getPossibleKinds() { return ['ONLY_PHP5', 'ONLY_PHP7', 'PREFER_PHP5', 'PREFER_PHP7']; }
/** * Is this parser factory supports kinds? * * PHP parser < 2.0 doesn't support kinds, >= 2.0 — does. * * @return bool */ public function hasKindsSupport() { return \class_exists(OriginalParserFactory::class); }
/** * Default kind (if supported, based on current interpreter's version). * * @return string|null */ public function getDefaultKind() { if ($this->hasKindsSupport()) { return \version_compare(\PHP_VERSION, '7.0', '>=') ? static::ONLY_PHP7 : static::ONLY_PHP5; } }
/** * New parser instance with given kind. * * @param string|null $kind One of class constants (only for PHP parser 2.0 and above) * * @return Parser */ public function createParser($kind = null) { if ($this->hasKindsSupport()) { $originalFactory = new OriginalParserFactory();
$kind = $kind ?: $this->getDefaultKind();
if (!\in_array($kind, static::getPossibleKinds())) { throw new \InvalidArgumentException('Unknown parser kind'); }
$parser = $originalFactory->create(\constant(OriginalParserFactory::class.'::'.$kind)); } else { if ($kind !== null) { throw new \InvalidArgumentException('Install PHP Parser v2.x to specify parser kind'); }
$parser = new Parser(new Lexer()); }
return $parser; } }
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