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<?php

/*
 * This file is part of Twig.
 *
 * (c) Fabien Potencier
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Twig;

use Twig\Node\Expression\FunctionExpression;
use Twig\Node\Node;

/**
 * Represents a template function.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @see https://twig.symfony.com/doc/templates.html#functions
 */
final class TwigFunction
{
    private $name;
    private $callable;
    private $options;
    private $arguments = [];

/**
     * @param callable|null $callable A callable implementing the function. If null, you need to overwrite the "node_class" option to customize compilation.
     */
    public function __construct(string $name, $callable = null, array $options = [])
    {
        $this->name = $name;
        $this->callable = $callable;
        $this->options = array_merge([
            'needs_environment' => false,
            'needs_context' => false,
            'is_variadic' => false,
            'is_safe' => null,
            'is_safe_callback' => null,
            'node_class' => FunctionExpression::class,
            'deprecated' => false,
            'alternative' => null,
        ], $options);
    }

public function getName(): string
    {
        return $this->name;
    }

/**
     * Returns the callable to execute for this function.
     *
     * @return callable|null
     */
    public function getCallable()
    {
        return $this->callable;
    }

public function getNodeClass(): string
    {
        return $this->options['node_class'];
    }

public function setArguments(array $arguments): void
    {
        $this->arguments = $arguments;
    }

public function getArguments(): array
    {
        return $this->arguments;
    }

public function needsEnvironment(): bool
    {
        return $this->options['needs_environment'];
    }

public function needsContext(): bool
    {
        return $this->options['needs_context'];
    }

public function getSafe(Node $functionArgs): ?array
    {
        if (null !== $this->options['is_safe']) {
            return $this->options['is_safe'];
        }

if (null !== $this->options['is_safe_callback']) {
            return $this->options['is_safe_callback']($functionArgs);
        }

return [];
    }

public function isVariadic(): bool
    {
        return (bool) $this->options['is_variadic'];
    }

public function isDeprecated(): bool
    {
        return (bool) $this->options['deprecated'];
    }

public function getDeprecatedVersion(): string
    {
        return \is_bool($this->options['deprecated']) ? '' : $this->options['deprecated'];
    }

public function getAlternative(): ?string
    {
        return $this->options['alternative'];
    }
}