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<?php
/*
* This file is part of Twig.
*
* (c) 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>
*/
final class Twig_NodeVisitor_Optimizer extends Twig_BaseNodeVisitor
{
const OPTIMIZE_ALL = -1;
const OPTIMIZE_NONE = 0;
const OPTIMIZE_FOR = 2;
const OPTIMIZE_RAW_FILTER = 4;
// obsolete, does not do anything
const OPTIMIZE_VAR_ACCESS = 8;
private $loops = [];
private $loopsTargets = [];
private $optimizers;
/**
* @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;
}
protected function doEnterNode(Twig_Node $node, Twig_Environment $env)
{
if (self::OPTIMIZE_FOR === (self::OPTIMIZE_FOR & $this->optimizers)) {
$this->enterOptimizeFor($node, $env);
}
return $node;
}
protected function doLeaveNode(Twig_Node $node, Twig_Environment $env)
{
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);
return $node;
}
/**
* Optimizes print nodes.
*
* It replaces:
*
* * "echo $this->render(Parent)Block()" with "$this->display(Parent)Block()"
*
* @return Twig_Node
*/
private function optimizePrintNode(Twig_Node $node, Twig_Environment $env)
{
if (!$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;
}
/**
* Removes "raw" filters.
*
* @return Twig_Node
*/
private function optimizeRawFilter(Twig_Node $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.
*/
private function enterOptimizeFor(Twig_Node $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.
*/
private function leaveOptimizeFor(Twig_Node $node, Twig_Environment $env)
{
if ($node instanceof Twig_Node_For) {
array_shift($this->loops);
array_shift($this->loopsTargets);
array_shift($this->loopsTargets);
}
}
private function addLoopToCurrent()
{
$this->loops[0]->setAttribute('with_loop', true);
}
private function addLoopToAll()
{
foreach ($this->loops as $loop) {
$loop->setAttribute('with_loop', true);
}
}
public function getPriority()
{
return 255;
}
}
class_alias('Twig_NodeVisitor_Optimizer', 'Twig\NodeVisitor\OptimizerNodeVisitor', false);
|
