<?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\ExpressionParser\Infix;

use Twig\ExpressionParser\AbstractExpressionParser;
use Twig\ExpressionParser\ExpressionParserDescriptionInterface;
use Twig\ExpressionParser\InfixAssociativity;
use Twig\ExpressionParser\InfixExpressionParserInterface;
use Twig\Node\Expression\AbstractExpression;
use Twig\Node\Expression\ArrayExpression;
use Twig\Node\Expression\MacroReferenceExpression;
use Twig\Node\Expression\Variable\ContextVariable;
use Twig\Node\Expression\Variable\TemplateVariable;
use Twig\Node\Nodes;
use Twig\Parser;
use Twig\Token;

/**
 * @internal
 */
class IsExpressionParser extends AbstractExpressionParser implements InfixExpressionParserInterface, ExpressionParserDescriptionInterface
{
    use ArgumentsTrait;

    public function parse(Parser $parser, AbstractExpression $expr, Token $token): AbstractExpression
    {
        $stream = $parser->getStream();
        $test = $parser->getTest($token->getLine());

        $arguments = null;
        if ($stream->test(Token::OPERATOR_TYPE, '(')) {
            $arguments = $this->parseNamedArguments($parser);
        } elseif ($test->hasOneMandatoryArgument()) {
            $arguments = new Nodes([0 => $parser->parseExpression($this->getPrecedence())]);
        }

        if ('defined' === $test->getName() && $expr instanceof ContextVariable && null !== $alias = $parser->getImportedSymbol('function', $expr->getAttribute('name'))) {
            /** @var TemplateVariable $var */
            $var = $alias['node']->getNode('var');
            $expr = new MacroReferenceExpression($var, $alias['name'], new ArrayExpression([], $expr->getTemplateLine()), $expr->getTemplateLine());
        }

        return new ($test->getNodeClass())($expr, $test, $arguments, $stream->getCurrent()->getLine());
    }

    public function getPrecedence(): int
    {
        return 100;
    }

    public function getName(): string
    {
        return 'is';
    }

    public function getDescription(): string
    {
        return 'Twig tests';
    }

    public function getAssociativity(): InfixAssociativity
    {
        return InfixAssociativity::Left;
    }
}
