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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2017 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 array('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('PhpParser\ParserFactory');
}
/**
* 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('PhpParser\ParserFactory::' . $kind));
} else {
if ($kind !== null) {
throw new \InvalidArgumentException('Install PHP Parser v2.x to specify parser kind');
}
$parser = new Parser(new Lexer());
}
return $parser;
}
}