SetNode.php

<?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\Node;

use Twig\Attribute\YieldReady;
use Twig\Compiler;
use Twig\Node\Expression\ConstantExpression;

/**
 * Represents a set node.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class SetNode extends Node implements NodeCaptureInterface {
    public function __construct(bool $capture, Node $names, Node $values, int $lineno) {
        
        /*
         * Optimizes the node when capture is used for a large block of text.
         *
         * {% set foo %}foo{% endset %} is compiled to $context['foo'] = new Twig\Markup("foo");
         */
        $safe = false;
        if ($capture) {
            $safe = true;
            // Node::class === get_class($values) should be removed in Twig 4.0
            if (($values instanceof Nodes || Node::class === get_class($values)) && !count($values)) {
                $values = new ConstantExpression('', $values->getTemplateLine());
                $capture = false;
            }
            elseif ($values instanceof TextNode) {
                $values = new ConstantExpression($values->getAttribute('data'), $values->getTemplateLine());
                $capture = false;
            }
            elseif ($values instanceof PrintNode && $values->getNode('expr') instanceof ConstantExpression) {
                $values = $values->getNode('expr');
                $capture = false;
            }
            else {
                $values = new CaptureNode($values, $values->getTemplateLine());
            }
        }
        parent::__construct([
            'names' => $names,
            'values' => $values,
        ], [
            'capture' => $capture,
            'safe' => $safe,
        ], $lineno);
    }
    public function compile(Compiler $compiler) : void {
        $compiler->addDebugInfo($this);
        if (\count($this->getNode('names')) > 1) {
            $compiler->write('[');
            foreach ($this->getNode('names') as $idx => $node) {
                if ($idx) {
                    $compiler->raw(', ');
                }
                $compiler->subcompile($node);
            }
            $compiler->raw(']');
        }
        else {
            $compiler->subcompile($this->getNode('names'), false);
        }
        $compiler->raw(' = ');
        if ($this->getAttribute('capture')) {
            $compiler->subcompile($this->getNode('values'));
        }
        else {
            if (\count($this->getNode('names')) > 1) {
                $compiler->write('[');
                foreach ($this->getNode('values') as $idx => $value) {
                    if ($idx) {
                        $compiler->raw(', ');
                    }
                    $compiler->subcompile($value);
                }
                $compiler->raw(']');
            }
            else {
                if ($this->getAttribute('safe')) {
                    if ($this->getNode('values') instanceof ConstantExpression) {
                        if ('' === $this->getNode('values')
                            ->getAttribute('value')) {
                            $compiler->raw('""');
                        }
                        else {
                            $compiler->raw('new Markup(')
                                ->subcompile($this->getNode('values'))
                                ->raw(', $this->env->getCharset())');
                        }
                    }
                    else {
                        $compiler->raw("('' === \$tmp = ")
                            ->subcompile($this->getNode('values'))
                            ->raw(") ? '' : new Markup(\$tmp, \$this->env->getCharset())");
                    }
                }
                else {
                    $compiler->subcompile($this->getNode('values'));
                }
            }
            $compiler->raw(';');
        }
        $compiler->raw("\n");
    }

}