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