vendor/twig/twig/lib/Twig/Node/Expression/Name.php

   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 class Twig_Node_Expression_Name extends Twig_Node_Expression
  13 {
  14     protected $specialVars = array(
  15         '_self'    => '$this',
  16         '_context' => '$context',
  17         '_charset' => '$this->env->getCharset()',
  18     );
  19
  20     public function __construct($name, $lineno)
  21     {
  22         parent::__construct(array(), array('name' => $name, 'is_defined_test' => false, 'ignore_strict_check' => false, 'always_defined' => false), $lineno);
  23     }
  24
  25     public function compile(Twig_Compiler $compiler)
  26     {
  27         $name = $this->getAttribute('name');
  28
  29         if ($this->getAttribute('is_defined_test')) {
  30             if ($this->isSpecial()) {
  31                 $compiler->repr(true);
  32             } else {
  33                 $compiler->raw('array_key_exists(')->repr($name)->raw(', $context)');
  34             }
  35         } elseif ($this->isSpecial()) {
  36             $compiler->raw($this->specialVars[$name]);
  37         } elseif ($this->getAttribute('always_defined')) {
  38             $compiler
  39                 ->raw('$context[')
  40                 ->string($name)
  41                 ->raw(']')
  42             ;
  43         } else {
  44             // remove the non-PHP 5.4 version when PHP 5.3 support is dropped
  45             // as the non-optimized version is just a workaround for slow ternary operator
  46             // when the context has a lot of variables
  47             if (version_compare(phpversion(), '5.4.0RC1', '>=')) {
  48                 // PHP 5.4 ternary operator performance was optimized
  49                 $compiler
  50                     ->raw('(isset($context[')
  51                     ->string($name)
  52                     ->raw(']) ? $context[')
  53                     ->string($name)
  54                     ->raw('] : ')
  55                 ;
  56
  57                 if ($this->getAttribute('ignore_strict_check') || !$compiler->getEnvironment()->isStrictVariables()) {
  58                     $compiler->raw('null)');
  59                 } else {
  60                     $compiler->raw('$this->getContext($context, ')->string($name)->raw('))');
  61                 }
  62             } else {
  63                 $compiler
  64                     ->raw('$this->getContext($context, ')
  65                     ->string($name)
  66                 ;
  67
  68                 if ($this->getAttribute('ignore_strict_check')) {
  69                     $compiler->raw(', true');
  70                 }
  71
  72                 $compiler
  73                     ->raw(')')
  74                 ;
  75             }
  76         }
  77     }
  78
  79     public function isSpecial()
  80     {
  81         return isset($this->specialVars[$this->getAttribute('name')]);
  82     }
  83
  84     public function isSimple()
  85     {
  86         return !$this->isSpecial() && !$this->getAttribute('is_defined_test');
  87     }
  88 }