Viewing file:  ForNode.php (3.78 KB) -rw-r--r--
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<?php
/*
* This file is part of Twig.
*
* (c) Fabien Potencier
* (c) Armin Ronacher
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Twig\Node;
use Twig\Compiler;
use Twig\Node\Expression\AbstractExpression;
use Twig\Node\Expression\AssignNameExpression;
/**
* Represents a for node.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class ForNode extends Node
{
private $loop;
public function __construct(AssignNameExpression $keyTarget, AssignNameExpression $valueTarget, AbstractExpression $seq, ?Node $ifexpr, Node $body, ?Node $else, int $lineno, string $tag = null)
{
$body = new Node([$body, $this->loop = new ForLoopNode($lineno, $tag)]);
$nodes = ['key_target' => $keyTarget, 'value_target' => $valueTarget, 'seq' => $seq, 'body' => $body];
if (null !== $else) {
$nodes['else'] = $else;
}
parent::__construct($nodes, ['with_loop' => true], $lineno, $tag);
}
public function compile(Compiler $compiler): void
{
$compiler
->addDebugInfo($this)
->write("\$context['_parent'] = \$context;\n")
->write("\$context['_seq'] = twig_ensure_traversable(")
->subcompile($this->getNode('seq'))
->raw(");\n")
;
if ($this->hasNode('else')) {
$compiler->write("\$context['_iterated'] = false;\n");
}
if ($this->getAttribute('with_loop')) {
$compiler
->write("\$context['loop'] = [\n")
->write(" 'parent' => \$context['_parent'],\n")
->write(" 'index0' => 0,\n")
->write(" 'index' => 1,\n")
->write(" 'first' => true,\n")
->write("];\n")
->write("if (is_array(\$context['_seq']) || (is_object(\$context['_seq']) && \$context['_seq'] instanceof \Countable)) {\n")
->indent()
->write("\$length = count(\$context['_seq']);\n")
->write("\$context['loop']['revindex0'] = \$length - 1;\n")
->write("\$context['loop']['revindex'] = \$length;\n")
->write("\$context['loop']['length'] = \$length;\n")
->write("\$context['loop']['last'] = 1 === \$length;\n")
->outdent()
->write("}\n")
;
}
$this->loop->setAttribute('else', $this->hasNode('else'));
$this->loop->setAttribute('with_loop', $this->getAttribute('with_loop'));
$compiler
->write("foreach (\$context['_seq'] as ")
->subcompile($this->getNode('key_target'))
->raw(' => ')
->subcompile($this->getNode('value_target'))
->raw(") {\n")
->indent()
->subcompile($this->getNode('body'))
->outdent()
->write("}\n")
;
if ($this->hasNode('else')) {
$compiler
->write("if (!\$context['_iterated']) {\n")
->indent()
->subcompile($this->getNode('else'))
->outdent()
->write("}\n")
;
}
$compiler->write("\$_parent = \$context['_parent'];\n");
// remove some "private" loop variables (needed for nested loops)
$compiler->write('unset($context[\'_seq\'], $context[\'_iterated\'], $context[\''.$this->getNode('key_target')->getAttribute('name').'\'], $context[\''.$this->getNode('value_target')->getAttribute('name').'\'], $context[\'_parent\'], $context[\'loop\']);'."\n");
// keep the values set in the inner context for variables defined in the outer context
$compiler->write("\$context = array_intersect_key(\$context, \$_parent) + \$_parent;\n");
}
}
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