vendor/twig/twig/src/Node/ForNode.php line 42

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  1. <?php
  3. /*
  4.  * This file is part of Twig.
  5.  *
  6.  * (c) Fabien Potencier
  7.  * (c) Armin Ronacher
  8.  *
  9.  * For the full copyright and license information, please view the LICENSE
  10.  * file that was distributed with this source code.
  11.  */
  13. namespace Twig\Node;
  15. use Twig\Attribute\YieldReady;
  16. use Twig\Compiler;
  17. use Twig\Node\Expression\AbstractExpression;
  18. use Twig\Node\Expression\AssignNameExpression;
  20. /**
  21.  * Represents a for node.
  22.  *
  23.  * @author Fabien Potencier <fabien@symfony.com>
  24.  */
  25. #[YieldReady]
  26. class ForNode extends Node
  27. {
  28.     private $loop;
  30.     public function __construct(AssignNameExpression $keyTarget, AssignNameExpression $valueTarget, AbstractExpression $seq, ?Node $ifexpr, Node $body, ?Node $else, int $lineno, ?string $tag = null)
  31.     {
  32.         $body = new Node([$body, $this->loop = new ForLoopNode($lineno, $tag)]);
  34.         $nodes = ['key_target' => $keyTarget, 'value_target' => $valueTarget, 'seq' => $seq, 'body' => $body];
  35.         if (null !== $else) {
  36.             $nodes['else'] = $else;
  37.         }
  39.         parent::__construct($nodes, ['with_loop' => true], $lineno, $tag);
  40.     }
  42.     public function compile(Compiler $compiler): void
  43.     {
  44.         $compiler
  45.             ->addDebugInfo($this)
  46.             ->write("\$context['_parent'] = \$context;\n")
  47.             ->write("\$context['_seq'] = CoreExtension::ensureTraversable(")
  48.             ->subcompile($this->getNode('seq'))
  49.             ->raw(");\n")
  50.         ;
  52.         if ($this->hasNode('else')) {
  53.             $compiler->write("\$context['_iterated'] = false;\n");
  54.         }
  56.         if ($this->getAttribute('with_loop')) {
  57.             $compiler
  58.                 ->write("\$context['loop'] = [\n")
  59.                 ->write("  'parent' => \$context['_parent'],\n")
  60.                 ->write("  'index0' => 0,\n")
  61.                 ->write("  'index'  => 1,\n")
  62.                 ->write("  'first'  => true,\n")
  63.                 ->write("];\n")
  64.                 ->write("if (is_array(\$context['_seq']) || (is_object(\$context['_seq']) && \$context['_seq'] instanceof \Countable)) {\n")
  65.                 ->indent()
  66.                 ->write("\$length = count(\$context['_seq']);\n")
  67.                 ->write("\$context['loop']['revindex0'] = \$length - 1;\n")
  68.                 ->write("\$context['loop']['revindex'] = \$length;\n")
  69.                 ->write("\$context['loop']['length'] = \$length;\n")
  70.                 ->write("\$context['loop']['last'] = 1 === \$length;\n")
  71.                 ->outdent()
  72.                 ->write("}\n")
  73.             ;
  74.         }
  76.         $this->loop->setAttribute('else', $this->hasNode('else'));
  77.         $this->loop->setAttribute('with_loop', $this->getAttribute('with_loop'));
  79.         $compiler
  80.             ->write("foreach (\$context['_seq'] as ")
  81.             ->subcompile($this->getNode('key_target'))
  82.             ->raw(' => ')
  83.             ->subcompile($this->getNode('value_target'))
  84.             ->raw(") {\n")
  85.             ->indent()
  86.             ->subcompile($this->getNode('body'))
  87.             ->outdent()
  88.             ->write("}\n")
  89.         ;
  91.         if ($this->hasNode('else')) {
  92.             $compiler
  93.                 ->write("if (!\$context['_iterated']) {\n")
  94.                 ->indent()
  95.                 ->subcompile($this->getNode('else'))
  96.                 ->outdent()
  97.                 ->write("}\n")
  98.             ;
  99.         }
  101.         $compiler->write("\$_parent = \$context['_parent'];\n");
  103.         // remove some "private" loop variables (needed for nested loops)
  104.         $compiler->write('unset($context[\'_seq\'], $context[\'_iterated\'], $context[\''.$this->getNode('key_target')->getAttribute('name').'\'], $context[\''.$this->getNode('value_target')->getAttribute('name').'\'], $context[\'_parent\'], $context[\'loop\']);'."\n");
  106.         // keep the values set in the inner context for variables defined in the outer context
  107.         $compiler->write("\$context = array_intersect_key(\$context, \$_parent) + \$_parent;\n");
  108.     }
  109. }