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<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\ExpressionLanguage; use Psr\Cache\CacheItemPoolInterface; use Symfony\Component\Cache\Adapter\ArrayAdapter; /** * Allows to compile and evaluate expressions written in your own DSL. * * @author Fabien Potencier <fabien@symfony.com> */ class ExpressionLanguage { private $cache; private $lexer; private $parser; private $compiler; protected $functions = []; /** * @param CacheItemPoolInterface $cache * @param ExpressionFunctionProviderInterface[] $providers */ public function __construct(CacheItemPoolInterface $cache = null, array $providers = []) { $this->cache = $cache ?: new ArrayAdapter(); $this->registerFunctions(); foreach ($providers as $provider) { $this->registerProvider($provider); } } /** * Compiles an expression source code. * * @param Expression|string $expression The expression to compile * @param array $names An array of valid names * * @return string The compiled PHP source code */ public function compile($expression, $names = []) { return $this->getCompiler()->compile($this->parse($expression, $names)->getNodes())->getSource(); } /** * Evaluate an expression. * * @param Expression|string $expression The expression to compile * @param array $values An array of values * * @return mixed The result of the evaluation of the expression */ public function evaluate($expression, $values = []) { return $this->parse($expression, array_keys($values))->getNodes()->evaluate($this->functions, $values); } /** * Parses an expression. * * @param Expression|string $expression The expression to parse * @param array $names An array of valid names * * @return ParsedExpression A ParsedExpression instance */ public function parse($expression, $names) { if ($expression instanceof ParsedExpression) { return $expression; } asort($names); $cacheKeyItems = []; foreach ($names as $nameKey => $name) { $cacheKeyItems[] = \is_int($nameKey) ? $name : $nameKey.':'.$name; } $cacheItem = $this->cache->getItem(rawurlencode($expression.'//'.implode('|', $cacheKeyItems))); if (null === $parsedExpression = $cacheItem->get()) { $nodes = $this->getParser()->parse($this->getLexer()->tokenize((string) $expression), $names); $parsedExpression = new ParsedExpression((string) $expression, $nodes); $cacheItem->set($parsedExpression); $this->cache->save($cacheItem); } return $parsedExpression; } /** * Registers a function. * * @param string $name The function name * @param callable $compiler A callable able to compile the function * @param callable $evaluator A callable able to evaluate the function * * @throws \LogicException when registering a function after calling evaluate(), compile() or parse() * * @see ExpressionFunction */ public function register($name, callable $compiler, callable $evaluator) { if (null !== $this->parser) { throw new \LogicException('Registering functions after calling evaluate(), compile() or parse() is not supported.'); } $this->functions[$name] = ['compiler' => $compiler, 'evaluator' => $evaluator]; } public function addFunction(ExpressionFunction $function) { $this->register($function->getName(), $function->getCompiler(), $function->getEvaluator()); } public function registerProvider(ExpressionFunctionProviderInterface $provider) { foreach ($provider->getFunctions() as $function) { $this->addFunction($function); } } protected function registerFunctions() { $this->addFunction(ExpressionFunction::fromPhp('constant')); } private function getLexer(): Lexer { if (null === $this->lexer) { $this->lexer = new Lexer(); } return $this->lexer; } private function getParser(): Parser { if (null === $this->parser) { $this->parser = new Parser($this->functions); } return $this->parser; } private function getCompiler(): Compiler { if (null === $this->compiler) { $this->compiler = new Compiler($this->functions); } return $this->compiler->reset(); } }
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