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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. */ namespace Twig\NodeVisitor; use Twig\Environment; use Twig\Node\BlockReferenceNode; use Twig\Node\Expression\BlockReferenceExpression; use Twig\Node\Expression\ConstantExpression; use Twig\Node\Expression\FilterExpression; use Twig\Node\Expression\FunctionExpression; use Twig\Node\Expression\GetAttrExpression; use Twig\Node\Expression\NameExpression; use Twig\Node\Expression\ParentExpression; use Twig\Node\ForNode; use Twig\Node\IncludeNode; use Twig\Node\Node; use Twig\Node\PrintNode; /** * Tries to optimize 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 OptimizerNodeVisitor extends AbstractNodeVisitor { 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(int $optimizers = -1) { if (!\is_int($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(Node $node, Environment $env) { if (self::OPTIMIZE_FOR === (self::OPTIMIZE_FOR & $this->optimizers)) { $this->enterOptimizeFor($node, $env); } return $node; } protected function doLeaveNode(Node $node, 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()" */ private function optimizePrintNode(Node $node, Environment $env): Node { if (!$node instanceof PrintNode) { return $node; } $exprNode = $node->getNode('expr'); if ( $exprNode instanceof BlockReferenceExpression || $exprNode instanceof ParentExpression ) { $exprNode->setAttribute('output', true); return $exprNode; } return $node; } /** * Removes "raw" filters. */ private function optimizeRawFilter(Node $node, Environment $env): Node { if ($node instanceof FilterExpression && '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(Node $node, Environment $env) { if ($node instanceof ForNode) { // 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 NameExpression && 'loop' === $node->getAttribute('name')) { $node->setAttribute('always_defined', true); $this->addLoopToCurrent(); } // optimize access to loop targets elseif ($node instanceof NameExpression && \in_array($node->getAttribute('name'), $this->loopsTargets)) { $node->setAttribute('always_defined', true); } // block reference elseif ($node instanceof BlockReferenceNode || $node instanceof BlockReferenceExpression) { $this->addLoopToCurrent(); } // include without the only attribute elseif ($node instanceof IncludeNode && !$node->getAttribute('only')) { $this->addLoopToAll(); } // include function without the with_context=false parameter elseif ($node instanceof FunctionExpression && '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 GetAttrExpression && (!$node->getNode('attribute') instanceof ConstantExpression || 'parent' === $node->getNode('attribute')->getAttribute('value') ) && (true === $this->loops[0]->getAttribute('with_loop') || ($node->getNode('node') instanceof NameExpression && 'loop' === $node->getNode('node')->getAttribute('name') ) ) ) { $this->addLoopToAll(); } } /** * Optimizes "for" tag by removing the "loop" variable creation whenever possible. */ private function leaveOptimizeFor(Node $node, Environment $env) { if ($node instanceof ForNode) { 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\OptimizerNodeVisitor', 'Twig_NodeVisitor_Optimizer');