shop.balmet.com

Optimizer.php (9329B)

---

 <?php
 
 /*
  * This file is part of Twig.
  *
  * (c) 2010 Fabien Potencier
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
  */
 
 /**
  * Twig_NodeVisitor_Optimizer tries to optimizes the AST.
  *
  * This visitor is always the last registered one.
  *
  * You can configure which optimizations you want to activate via the
  * optimizer mode.
  *
  * @author Fabien Potencier <fabien@symfony.com>
  */
 class Twig_NodeVisitor_Optimizer extends Twig_BaseNodeVisitor
 {
     const OPTIMIZE_ALL = -1;
     const OPTIMIZE_NONE = 0;
     const OPTIMIZE_FOR = 2;
     const OPTIMIZE_RAW_FILTER = 4;
     const OPTIMIZE_VAR_ACCESS = 8;
 
     protected $loops = array();
     protected $loopsTargets = array();
     protected $optimizers;
     protected $prependedNodes = array();
     protected $inABody = false;
 
     /**
      * Constructor.
      *
      * @param int $optimizers The optimizer mode
      */
     public function __construct($optimizers = -1)
     {
         if (!is_int($optimizers) || $optimizers > (self::OPTIMIZE_FOR | self::OPTIMIZE_RAW_FILTER | self::OPTIMIZE_VAR_ACCESS)) {
             throw new InvalidArgumentException(sprintf('Optimizer mode "%s" is not valid.', $optimizers));
         }
 
         $this->optimizers = $optimizers;
     }
 
     /**
      * {@inheritdoc}
      */
     protected function doEnterNode(Twig_Node $node, Twig_Environment $env)
     {
         if (self::OPTIMIZE_FOR === (self::OPTIMIZE_FOR & $this->optimizers)) {
             $this->enterOptimizeFor($node, $env);
         }
 
         if (PHP_VERSION_ID < 50400 && self::OPTIMIZE_VAR_ACCESS === (self::OPTIMIZE_VAR_ACCESS & $this->optimizers) && !$env->isStrictVariables() && !$env->hasExtension('sandbox')) {
             if ($this->inABody) {
                 if (!$node instanceof Twig_Node_Expression) {
                     if (get_class($node) !== 'Twig_Node') {
                         array_unshift($this->prependedNodes, array());
                     }
                 } else {
                     $node = $this->optimizeVariables($node, $env);
                 }
             } elseif ($node instanceof Twig_Node_Body) {
                 $this->inABody = true;
             }
         }
 
         return $node;
     }
 
     /**
      * {@inheritdoc}
      */
     protected function doLeaveNode(Twig_Node $node, Twig_Environment $env)
     {
         $expression = $node instanceof Twig_Node_Expression;
 
         if (self::OPTIMIZE_FOR === (self::OPTIMIZE_FOR & $this->optimizers)) {
             $this->leaveOptimizeFor($node, $env);
         }
 
         if (self::OPTIMIZE_RAW_FILTER === (self::OPTIMIZE_RAW_FILTER & $this->optimizers)) {
             $node = $this->optimizeRawFilter($node, $env);
         }
 
         $node = $this->optimizePrintNode($node, $env);
 
         if (self::OPTIMIZE_VAR_ACCESS === (self::OPTIMIZE_VAR_ACCESS & $this->optimizers) && !$env->isStrictVariables() && !$env->hasExtension('sandbox')) {
             if ($node instanceof Twig_Node_Body) {
                 $this->inABody = false;
             } elseif ($this->inABody) {
                 if (!$expression && get_class($node) !== 'Twig_Node' && $prependedNodes = array_shift($this->prependedNodes)) {
                     $nodes = array();
                     foreach (array_unique($prependedNodes) as $name) {
                         $nodes[] = new Twig_Node_SetTemp($name, $node->getLine());
                     }
 
                     $nodes[] = $node;
                     $node = new Twig_Node($nodes);
                 }
             }
         }
 
         return $node;
     }
 
     protected function optimizeVariables(Twig_NodeInterface $node, Twig_Environment $env)
     {
         if ('Twig_Node_Expression_Name' === get_class($node) && $node->isSimple()) {
             $this->prependedNodes[0][] = $node->getAttribute('name');
 
             return new Twig_Node_Expression_TempName($node->getAttribute('name'), $node->getLine());
         }
 
         return $node;
     }
 
     /**
      * Optimizes print nodes.
      *
      * It replaces:
      *
      *   * "echo $this->render(Parent)Block()" with "$this->display(Parent)Block()"
      *
      * @param Twig_NodeInterface $node A Node
      * @param Twig_Environment   $env  The current Twig environment
      *
      * @return Twig_NodeInterface
      */
     protected function optimizePrintNode(Twig_NodeInterface $node, Twig_Environment $env)
     {
         if (!$node instanceof Twig_Node_Print) {
             return $node;
         }
 
         if (
             $node->getNode('expr') instanceof Twig_Node_Expression_BlockReference ||
             $node->getNode('expr') instanceof Twig_Node_Expression_Parent
         ) {
             $node->getNode('expr')->setAttribute('output', true);
 
             return $node->getNode('expr');
         }
 
         return $node;
     }
 
     /**
      * Removes "raw" filters.
      *
      * @param Twig_NodeInterface $node A Node
      * @param Twig_Environment   $env  The current Twig environment
      *
      * @return Twig_NodeInterface
      */
     protected function optimizeRawFilter(Twig_NodeInterface $node, Twig_Environment $env)
     {
         if ($node instanceof Twig_Node_Expression_Filter && 'raw' == $node->getNode('filter')->getAttribute('value')) {
             return $node->getNode('node');
         }
 
         return $node;
     }
 
     /**
      * Optimizes "for" tag by removing the "loop" variable creation whenever possible.
      *
      * @param Twig_NodeInterface $node A Node
      * @param Twig_Environment   $env  The current Twig environment
      */
     protected function enterOptimizeFor(Twig_NodeInterface $node, Twig_Environment $env)
     {
         if ($node instanceof Twig_Node_For) {
             // disable the loop variable by default
             $node->setAttribute('with_loop', false);
             array_unshift($this->loops, $node);
             array_unshift($this->loopsTargets, $node->getNode('value_target')->getAttribute('name'));
             array_unshift($this->loopsTargets, $node->getNode('key_target')->getAttribute('name'));
         } elseif (!$this->loops) {
             // we are outside a loop
             return;
         }
 
         // when do we need to add the loop variable back?
 
         // the loop variable is referenced for the current loop
         elseif ($node instanceof Twig_Node_Expression_Name && 'loop' === $node->getAttribute('name')) {
             $node->setAttribute('always_defined', true);
             $this->addLoopToCurrent();
         }
 
         // optimize access to loop targets
         elseif ($node instanceof Twig_Node_Expression_Name && in_array($node->getAttribute('name'), $this->loopsTargets)) {
             $node->setAttribute('always_defined', true);
         }
 
         // block reference
         elseif ($node instanceof Twig_Node_BlockReference || $node instanceof Twig_Node_Expression_BlockReference) {
             $this->addLoopToCurrent();
         }
 
         // include without the only attribute
         elseif ($node instanceof Twig_Node_Include && !$node->getAttribute('only')) {
             $this->addLoopToAll();
         }
 
         // include function without the with_context=false parameter
         elseif ($node instanceof Twig_Node_Expression_Function
             && 'include' === $node->getAttribute('name')
             && (!$node->getNode('arguments')->hasNode('with_context')
                  || false !== $node->getNode('arguments')->getNode('with_context')->getAttribute('value')
                )
         ) {
             $this->addLoopToAll();
         }
 
         // the loop variable is referenced via an attribute
         elseif ($node instanceof Twig_Node_Expression_GetAttr
             && (!$node->getNode('attribute') instanceof Twig_Node_Expression_Constant
                 || 'parent' === $node->getNode('attribute')->getAttribute('value')
                )
             && (true === $this->loops[0]->getAttribute('with_loop')
                 || ($node->getNode('node') instanceof Twig_Node_Expression_Name
                     && 'loop' === $node->getNode('node')->getAttribute('name')
                    )
                )
         ) {
             $this->addLoopToAll();
         }
     }
 
     /**
      * Optimizes "for" tag by removing the "loop" variable creation whenever possible.
      *
      * @param Twig_NodeInterface $node A Node
      * @param Twig_Environment   $env  The current Twig environment
      */
     protected function leaveOptimizeFor(Twig_NodeInterface $node, Twig_Environment $env)
     {
         if ($node instanceof Twig_Node_For) {
             array_shift($this->loops);
             array_shift($this->loopsTargets);
             array_shift($this->loopsTargets);
         }
     }
 
     protected function addLoopToCurrent()
     {
         $this->loops[0]->setAttribute('with_loop', true);
     }
 
     protected function addLoopToAll()
     {
         foreach ($this->loops as $loop) {
             $loop->setAttribute('with_loop', true);
         }
     }
 
     /**
      * {@inheritdoc}
      */
     public function getPriority()
     {
         return 255;
     }
 }