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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; /** * Represents a function that can be used in an expression. * * A function is defined by two PHP callables. The callables are used * by the language to compile and/or evaluate the function. * * The "compiler" function is used at compilation time and must return a * PHP representation of the function call (it receives the function * arguments as arguments). * * The "evaluator" function is used for expression evaluation and must return * the value of the function call based on the values defined for the * expression (it receives the values as a first argument and the function * arguments as remaining arguments). * * @author Fabien Potencier <fabien@symfony.com> */ class ExpressionFunction { private $name; private $compiler; private $evaluator; /** * @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 */ public function __construct(string $name, callable $compiler, callable $evaluator) { $this->name = $name; $this->compiler = $compiler; $this->evaluator = $evaluator; } public function getName() { return $this->name; } public function getCompiler() { return $this->compiler; } public function getEvaluator() { return $this->evaluator; } /** * Creates an ExpressionFunction from a PHP function name. * * @param string $phpFunctionName The PHP function name * @param string|null $expressionFunctionName The expression function name (default: same than the PHP function name) * * @return self * * @throws \InvalidArgumentException if given PHP function name does not exist * @throws \InvalidArgumentException if given PHP function name is in namespace * and expression function name is not defined */ public static function fromPhp($phpFunctionName, $expressionFunctionName = null) { $phpFunctionName = ltrim($phpFunctionName, '\\'); if (!\function_exists($phpFunctionName)) { throw new \InvalidArgumentException(sprintf('PHP function "%s" does not exist.', $phpFunctionName)); } $parts = explode('\\', $phpFunctionName); if (!$expressionFunctionName && \count($parts) > 1) { throw new \InvalidArgumentException(sprintf('An expression function name must be defined when PHP function "%s" is namespaced.', $phpFunctionName)); } $compiler = function () use ($phpFunctionName) { return sprintf('\%s(%s)', $phpFunctionName, implode(', ', \func_get_args())); }; $evaluator = function () use ($phpFunctionName) { return $phpFunctionName(...\array_slice(\func_get_args(), 1)); }; return new self($expressionFunctionName ?: end($parts), $compiler, $evaluator); } }