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1 | <?php |
2 | ||
3 | /* | |
4 | * This file is part of Twig. | |
5 | * | |
6 | * (c) 2009 Fabien Potencier | |
7 | * (c) 2009 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 | parent::__construct(array('key_target' => $keyTarget, 'value_target' => $valueTarget, 'seq' => $seq, 'body' => $body, 'else' => $else), array('with_loop' => true, 'ifexpr' => null !== $ifexpr), $lineno, $tag); | |
31 | } | |
32 | ||
33 | /** | |
34 | * Compiles the node to PHP. | |
35 | * | |
36 | * @param Twig_Compiler A Twig_Compiler instance | |
37 | */ | |
38 | public function compile(Twig_Compiler $compiler) | |
39 | { | |
40 | $compiler | |
41 | ->addDebugInfo($this) | |
42 | // the (array) cast bypasses a PHP 5.2.6 bug | |
43 | ->write("\$context['_parent'] = (array) \$context;\n") | |
44 | ->write("\$context['_seq'] = twig_ensure_traversable(") | |
45 | ->subcompile($this->getNode('seq')) | |
46 | ->raw(");\n") | |
47 | ; | |
48 | ||
49 | if (null !== $this->getNode('else')) { | |
50 | $compiler->write("\$context['_iterated'] = false;\n"); | |
51 | } | |
52 | ||
53 | if ($this->getAttribute('with_loop')) { | |
54 | $compiler | |
55 | ->write("\$context['loop'] = array(\n") | |
56 | ->write(" 'parent' => \$context['_parent'],\n") | |
57 | ->write(" 'index0' => 0,\n") | |
58 | ->write(" 'index' => 1,\n") | |
59 | ->write(" 'first' => true,\n") | |
60 | ->write(");\n") | |
61 | ; | |
62 | ||
63 | if (!$this->getAttribute('ifexpr')) { | |
64 | $compiler | |
65 | ->write("if (is_array(\$context['_seq']) || (is_object(\$context['_seq']) && \$context['_seq'] instanceof Countable)) {\n") | |
66 | ->indent() | |
67 | ->write("\$length = count(\$context['_seq']);\n") | |
68 | ->write("\$context['loop']['revindex0'] = \$length - 1;\n") | |
69 | ->write("\$context['loop']['revindex'] = \$length;\n") | |
70 | ->write("\$context['loop']['length'] = \$length;\n") | |
71 | ->write("\$context['loop']['last'] = 1 === \$length;\n") | |
72 | ->outdent() | |
73 | ->write("}\n") | |
74 | ; | |
75 | } | |
76 | } | |
77 | ||
78 | $this->loop->setAttribute('else', null !== $this->getNode('else')); | |
79 | $this->loop->setAttribute('with_loop', $this->getAttribute('with_loop')); | |
80 | $this->loop->setAttribute('ifexpr', $this->getAttribute('ifexpr')); | |
81 | ||
82 | $compiler | |
83 | ->write("foreach (\$context['_seq'] as ") | |
84 | ->subcompile($this->getNode('key_target')) | |
85 | ->raw(" => ") | |
86 | ->subcompile($this->getNode('value_target')) | |
87 | ->raw(") {\n") | |
88 | ->indent() | |
89 | ->subcompile($this->getNode('body')) | |
90 | ->outdent() | |
91 | ->write("}\n") | |
92 | ; | |
93 | ||
94 | if (null !== $this->getNode('else')) { | |
95 | $compiler | |
96 | ->write("if (!\$context['_iterated']) {\n") | |
97 | ->indent() | |
98 | ->subcompile($this->getNode('else')) | |
99 | ->outdent() | |
100 | ->write("}\n") | |
101 | ; | |
102 | } | |
103 | ||
104 | $compiler->write("\$_parent = \$context['_parent'];\n"); | |
105 | ||
106 | // remove some "private" loop variables (needed for nested loops) | |
107 | $compiler->write('unset($context[\'_seq\'], $context[\'_iterated\'], $context[\''.$this->getNode('key_target')->getAttribute('name').'\'], $context[\''.$this->getNode('value_target')->getAttribute('name').'\'], $context[\'_parent\'], $context[\'loop\']);'."\n"); | |
108 | ||
109 | // keep the values set in the inner context for variables defined in the outer context | |
110 | $compiler->write("\$context = array_intersect_key(\$context, \$_parent) + \$_parent;\n"); | |
111 | } | |
112 | } |