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vendor/symfony/expression-language/ExpressionFunction.php

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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 string $name;
+    private \Closure $compiler;
+    private \Closure $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(): string
+    {
+        return $this->name;
+    }
+
+    public function getCompiler(): \Closure
+    {
+        return $this->compiler;
+    }
+
+    public function getEvaluator(): \Closure
+    {
+        return $this->evaluator;
+    }
+
+    /**
+     * Creates an ExpressionFunction from a PHP function name.
+     *
+     * @param string|null $expressionFunctionName The expression function name (default: same than the PHP function name)
+     *
+     * @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(string $phpFunctionName, ?string $expressionFunctionName = null): self
+    {
+        $phpFunctionName = ltrim($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));
+        }
+
+        $compiler = fn (...$args) => sprintf('\%s(%s)', $phpFunctionName, implode(', ', $args));
+
+        $evaluator = fn ($p, ...$args) => $phpFunctionName(...$args);
+
+        return new self($expressionFunctionName ?: end($parts), $compiler, $evaluator);
+    }
+}