www.aleph1.co.uk Git - yaffs-website/blob - vendor/twig/twig/lib/Twig/Node/For.php

   1 <?php
   2
   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  */
  12
  13 /**
  14  * Represents a for node.
  15  *
  16  * @author Fabien Potencier <fabien@symfony.com>
  17  */
  18 class Twig_Node_For extends Twig_Node
  19 {
  20     protected $loop;
  21
  22     public function __construct(Twig_Node_Expression_AssignName $keyTarget, Twig_Node_Expression_AssignName $valueTarget, Twig_Node_Expression $seq, Twig_Node_Expression $ifexpr = null, Twig_NodeInterface $body, Twig_NodeInterface $else = null, $lineno, $tag = null)
  23     {
  24         $body = new Twig_Node(array($body, $this->loop = new Twig_Node_ForLoop($lineno, $tag)));
  25
  26         if (null !== $ifexpr) {
  27             $body = new Twig_Node_If(new Twig_Node(array($ifexpr, $body)), null, $lineno, $tag);
  28         }
  29
  30         $nodes = array('key_target' => $keyTarget, 'value_target' => $valueTarget, 'seq' => $seq, 'body' => $body);
  31         if (null !== $else) {
  32             $nodes['else'] = $else;
  33         }
  34
  35         parent::__construct($nodes, array('with_loop' => true, 'ifexpr' => null !== $ifexpr), $lineno, $tag);
  36     }
  37
  38     public function compile(Twig_Compiler $compiler)
  39     {
  40         $compiler
  41             ->addDebugInfo($this)
  42             ->write("\$context['_parent'] = \$context;\n")
  43             ->write("\$context['_seq'] = twig_ensure_traversable(")
  44             ->subcompile($this->getNode('seq'))
  45             ->raw(");\n")
  46         ;
  47
  48         if ($this->hasNode('else')) {
  49             $compiler->write("\$context['_iterated'] = false;\n");
  50         }
  51
  52         if ($this->getAttribute('with_loop')) {
  53             $compiler
  54                 ->write("\$context['loop'] = array(\n")
  55                 ->write("  'parent' => \$context['_parent'],\n")
  56                 ->write("  'index0' => 0,\n")
  57                 ->write("  'index'  => 1,\n")
  58                 ->write("  'first'  => true,\n")
  59                 ->write(");\n")
  60             ;
  61
  62             if (!$this->getAttribute('ifexpr')) {
  63                 $compiler
  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             }
  75         }
  76
  77         $this->loop->setAttribute('else', $this->hasNode('else'));
  78         $this->loop->setAttribute('with_loop', $this->getAttribute('with_loop'));
  79         $this->loop->setAttribute('ifexpr', $this->getAttribute('ifexpr'));
  80
  81         $compiler
  82             ->write("foreach (\$context['_seq'] as ")
  83             ->subcompile($this->getNode('key_target'))
  84             ->raw(' => ')
  85             ->subcompile($this->getNode('value_target'))
  86             ->raw(") {\n")
  87             ->indent()
  88             ->subcompile($this->getNode('body'))
  89             ->outdent()
  90             ->write("}\n")
  91         ;
  92
  93         if ($this->hasNode('else')) {
  94             $compiler
  95                 ->write("if (!\$context['_iterated']) {\n")
  96                 ->indent()
  97                 ->subcompile($this->getNode('else'))
  98                 ->outdent()
  99                 ->write("}\n")
 100             ;
 101         }
 102
 103         $compiler->write("\$_parent = \$context['_parent'];\n");
 104
 105         // remove some "private" loop variables (needed for nested loops)
 106         $compiler->write('unset($context[\'_seq\'], $context[\'_iterated\'], $context[\''.$this->getNode('key_target')->getAttribute('name').'\'], $context[\''.$this->getNode('value_target')->getAttribute('name').'\'], $context[\'_parent\'], $context[\'loop\']);'."\n");
 107
 108         // keep the values set in the inner context for variables defined in the outer context
 109         $compiler->write("\$context = array_intersect_key(\$context, \$_parent) + \$_parent;\n");
 110     }
 111 }