Twig_NodeVisitor_Optimizer Class Reference

Twig_NodeVisitor_Optimizer tries to optimizes the AST. More...

Inheritance diagram for Twig_NodeVisitor_Optimizer:

Collaboration diagram for Twig_NodeVisitor_Optimizer:

Public Member Functions
	__construct ($optimizers=-1)
	getPriority ()
	Returns the priority for this visitor. More...
Public Member Functions inherited from Twig_BaseNodeVisitor
	enterNode (Twig_NodeInterface $node, Twig_Environment $env)
	Called before child nodes are visited. More...
	leaveNode (Twig_NodeInterface $node, Twig_Environment $env)
	Called after child nodes are visited. More...
	enterNode (Twig_NodeInterface $node, Twig_Environment $env)
	Called before child nodes are visited. More...
	leaveNode (Twig_NodeInterface $node, Twig_Environment $env)
	Called after child nodes are visited. More...
	getPriority ()
	Returns the priority for this visitor. More...

Data Fields
const	OPTIMIZE_ALL = -1
const	OPTIMIZE_NONE = 0
const	OPTIMIZE_FOR = 2
const	OPTIMIZE_RAW_FILTER = 4
const	OPTIMIZE_VAR_ACCESS = 8

Protected Member Functions
	doEnterNode (Twig_Node $node, Twig_Environment $env)
	Called before child nodes are visited. More...
	doLeaveNode (Twig_Node $node, Twig_Environment $env)
	Called after child nodes are visited. More...
	optimizeVariables (Twig_NodeInterface $node, Twig_Environment $env)
	optimizePrintNode (Twig_NodeInterface $node, Twig_Environment $env)
	Optimizes print nodes. More...
	optimizeRawFilter (Twig_NodeInterface $node, Twig_Environment $env)
	Removes "raw" filters. More...
	enterOptimizeFor (Twig_NodeInterface $node, Twig_Environment $env)
	Optimizes "for" tag by removing the "loop" variable creation whenever possible. More...
	leaveOptimizeFor (Twig_NodeInterface $node, Twig_Environment $env)
	Optimizes "for" tag by removing the "loop" variable creation whenever possible. More...
	addLoopToCurrent ()
	addLoopToAll ()
	doEnterNode (Twig_Node $node, Twig_Environment $env)
	Called before child nodes are visited. More...
	doLeaveNode (Twig_Node $node, Twig_Environment $env)
	Called after child nodes are visited. More...

Protected Attributes
	$loops = array()
	$loopsTargets = array()
	$optimizers
	$prependedNodes = array()
	$inABody = false

Detailed Description

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.

@final

Author

Fabien Potencier fabie.nosp@m.n@sy.nosp@m.mfony.nosp@m..com

Definition at line 24 of file Optimizer.php.

Constructor & Destructor Documentation

__construct()

Twig_NodeVisitor_Optimizer::__construct

(

$optimizers = -1

)

Parameters

int

$optimizers

The optimizer mode

Definition at line 41 of file Optimizer.php.

    {
        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;
    }

References $optimizers.

Member Function Documentation

addLoopToAll()

Twig_NodeVisitor_Optimizer::addLoopToAll ( )

protected

Definition at line 240 of file Optimizer.php.

    {
        foreach ($this->loops as $loop) {
            $loop->setAttribute('with_loop', true);
        }
    }

Referenced by enterOptimizeFor().

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addLoopToCurrent()

Twig_NodeVisitor_Optimizer::addLoopToCurrent ( )

protected

Definition at line 235 of file Optimizer.php.

    {
        $this->loops[0]->setAttribute('with_loop', true);
    }

Referenced by enterOptimizeFor().

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doEnterNode()

Twig_NodeVisitor_Optimizer::doEnterNode ( Twig_Node  $node, Twig_Environment  $env  )

protected

Called before child nodes are visited.

Returns

Twig_Node The modified node

Reimplemented from Twig_BaseNodeVisitor.

Definition at line 50 of file Optimizer.php.

    {
        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() && !$env->hasExtension('Twig_Extension_Sandbox')) {
            if ($this->inABody) {
                if (!$node instanceof Twig_Node_Expression) {
                    if ('Twig_Node' !== get_class($node)) {
                        array_unshift($this->prependedNodes, array());
                    }
                } else {
                    $node = $this->optimizeVariables($node, $env);
                }
            } elseif ($node instanceof Twig_Node_Body) {
                $this->inABody = true;
            }
        }
 
        return $node;
    }

References $env, enterOptimizeFor(), and optimizeVariables().

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doLeaveNode()

Twig_NodeVisitor_Optimizer::doLeaveNode ( Twig_Node  $node, Twig_Environment  $env  )

protected

Called after child nodes are visited.

Returns

Twig_Node|false The modified node or false if the node must be removed

Reimplemented from Twig_BaseNodeVisitor.

Definition at line 73 of file Optimizer.php.

    {
        $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() && !$env->hasExtension('Twig_Extension_Sandbox')) {
            if ($node instanceof Twig_Node_Body) {
                $this->inABody = false;
            } elseif ($this->inABody) {
                if (!$expression && 'Twig_Node' !== get_class($node) && $prependedNodes = array_shift($this->prependedNodes)) {
                    $nodes = array();
                    foreach (array_unique($prependedNodes) as $name) {
                        $nodes[] = new Twig_Node_SetTemp($name, $node->getTemplateLine());
                    }
 
                    $nodes[] = $node;
                    $node = new Twig_Node($nodes);
                }
            }
        }
 
        return $node;
    }

References $env, $name, $nodes, $prependedNodes, Twig_Node\getTemplateLine(), leaveOptimizeFor(), optimizePrintNode(), and optimizeRawFilter().

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enterOptimizeFor()

Twig_NodeVisitor_Optimizer::enterOptimizeFor ( Twig_NodeInterface  $node, Twig_Environment  $env  )

protected

Optimizes "for" tag by removing the "loop" variable creation whenever possible.

Definition at line 162 of file Optimizer.php.

    {
        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();
        }
    }

References addLoopToAll(), and addLoopToCurrent().

Referenced by doEnterNode().

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getPriority()

Twig_NodeVisitor_Optimizer::getPriority

(

)

Returns the priority for this visitor.

Priority should be between -10 and 10 (0 is the default).

Returns

int The priority level

Implements Twig_NodeVisitorInterface.

Definition at line 247 of file Optimizer.php.

    {
        return 255;
    }

leaveOptimizeFor()

Twig_NodeVisitor_Optimizer::leaveOptimizeFor ( Twig_NodeInterface  $node, Twig_Environment  $env  )

protected

Optimizes "for" tag by removing the "loop" variable creation whenever possible.

Definition at line 226 of file Optimizer.php.

    {
        if ($node instanceof Twig_Node_For) {
            array_shift($this->loops);
            array_shift($this->loopsTargets);
            array_shift($this->loopsTargets);
        }
    }

Referenced by doLeaveNode().

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optimizePrintNode()

Twig_NodeVisitor_Optimizer::optimizePrintNode ( Twig_NodeInterface  $node, Twig_Environment  $env  )

protected

Optimizes print nodes.

It replaces:

• "echo $this->render(Parent)Block()" with "$this->display(Parent)Block()"

Returns

Twig_NodeInterface

Definition at line 126 of file Optimizer.php.

    {
        if (!$node instanceof Twig_Node_Print) {
            return $node;
        }
 
        $exprNode = $node->getNode('expr');
        if (
            $exprNode instanceof Twig_Node_Expression_BlockReference ||
            $exprNode instanceof Twig_Node_Expression_Parent
        ) {
            $exprNode->setAttribute('output', true);
 
            return $exprNode;
        }
 
        return $node;
    }

Referenced by doLeaveNode().

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optimizeRawFilter()

Twig_NodeVisitor_Optimizer::optimizeRawFilter ( Twig_NodeInterface  $node, Twig_Environment  $env  )

protected

Removes "raw" filters.

Returns

Twig_NodeInterface

Definition at line 150 of file Optimizer.php.

    {
        if ($node instanceof Twig_Node_Expression_Filter && 'raw' == $node->getNode('filter')->getAttribute('value')) {
            return $node->getNode('node');
        }
 
        return $node;
    }

Referenced by doLeaveNode().

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optimizeVariables()

Twig_NodeVisitor_Optimizer::optimizeVariables ( Twig_NodeInterface  $node, Twig_Environment  $env  )

protected

Definition at line 106 of file Optimizer.php.

    {
        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->getTemplateLine());
        }
 
        return $node;
    }

Referenced by doEnterNode().

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Field Documentation

$inABody

Twig_NodeVisitor_Optimizer::$inABody = false

protected

Definition at line 36 of file Optimizer.php.

$loops

Twig_NodeVisitor_Optimizer::$loops = array()

protected

Definition at line 32 of file Optimizer.php.

$loopsTargets

Twig_NodeVisitor_Optimizer::$loopsTargets = array()

protected

Definition at line 33 of file Optimizer.php.

$optimizers

Twig_NodeVisitor_Optimizer::$optimizers

protected

Definition at line 34 of file Optimizer.php.

Referenced by __construct().

$prependedNodes

Twig_NodeVisitor_Optimizer::$prependedNodes = array()

protected

Definition at line 35 of file Optimizer.php.

Referenced by doLeaveNode().

OPTIMIZE_ALL

const Twig_NodeVisitor_Optimizer::OPTIMIZE_ALL = -1

Definition at line 26 of file Optimizer.php.

OPTIMIZE_FOR

const Twig_NodeVisitor_Optimizer::OPTIMIZE_FOR = 2

Definition at line 28 of file Optimizer.php.

OPTIMIZE_NONE

const Twig_NodeVisitor_Optimizer::OPTIMIZE_NONE = 0

Definition at line 27 of file Optimizer.php.

OPTIMIZE_RAW_FILTER

const Twig_NodeVisitor_Optimizer::OPTIMIZE_RAW_FILTER = 4

Definition at line 29 of file Optimizer.php.

OPTIMIZE_VAR_ACCESS

const Twig_NodeVisitor_Optimizer::OPTIMIZE_VAR_ACCESS = 8

Definition at line 30 of file Optimizer.php.

---

The documentation for this class was generated from the following file:

• libs/composer/vendor/twig/twig/lib/Twig/NodeVisitor/Optimizer.php