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<?php
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/*
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* This file is part of Twig.
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*
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* (c) 2009 Fabien Potencier
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Twig_NodeVisitor_Escaper implements output escaping.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Twig_NodeVisitor_Escaper implements Twig_NodeVisitorInterface
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{
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protected $statusStack = array();
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protected $blocks = array();
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protected $safeAnalysis;
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protected $traverser;
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protected $defaultStrategy = false;
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protected $safeVars = array();
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public function __construct()
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{
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$this->safeAnalysis = new Twig_NodeVisitor_SafeAnalysis();
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}
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/**
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* Called before child nodes are visited.
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*
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* @param Twig_NodeInterface $node The node to visit
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* @param Twig_Environment $env The Twig environment instance
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*
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* @return Twig_NodeInterface The modified node
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*/
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public function enterNode(Twig_NodeInterface $node, Twig_Environment $env)
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{
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if ($node instanceof Twig_Node_Module) {
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if ($env->hasExtension('escaper') && $defaultStrategy = $env->getExtension('escaper')->getDefaultStrategy($node->getAttribute('filename'))) {
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$this->defaultStrategy = $defaultStrategy;
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}
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$this->safeVars = array();
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} elseif ($node instanceof Twig_Node_AutoEscape) {
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$this->statusStack[] = $node->getAttribute('value');
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} elseif ($node instanceof Twig_Node_Block) {
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$this->statusStack[] = isset($this->blocks[$node->getAttribute('name')]) ? $this->blocks[$node->getAttribute('name')] : $this->needEscaping($env);
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} elseif ($node instanceof Twig_Node_Import) {
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$this->safeVars[] = $node->getNode('var')->getAttribute('name');
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}
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return $node;
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}
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/**
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* Called after child nodes are visited.
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*
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* @param Twig_NodeInterface $node The node to visit
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* @param Twig_Environment $env The Twig environment instance
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*
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* @return Twig_NodeInterface The modified node
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*/
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public function leaveNode(Twig_NodeInterface $node, Twig_Environment $env)
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{
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if ($node instanceof Twig_Node_Module) {
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$this->defaultStrategy = false;
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$this->safeVars = array();
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} elseif ($node instanceof Twig_Node_Expression_Filter) {
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return $this->preEscapeFilterNode($node, $env);
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} elseif ($node instanceof Twig_Node_Print) {
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return $this->escapePrintNode($node, $env, $this->needEscaping($env));
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}
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if ($node instanceof Twig_Node_AutoEscape || $node instanceof Twig_Node_Block) {
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array_pop($this->statusStack);
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} elseif ($node instanceof Twig_Node_BlockReference) {
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$this->blocks[$node->getAttribute('name')] = $this->needEscaping($env);
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}
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return $node;
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}
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protected function escapePrintNode(Twig_Node_Print $node, Twig_Environment $env, $type)
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{
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if (false === $type) {
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return $node;
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}
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$expression = $node->getNode('expr');
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if ($this->isSafeFor($type, $expression, $env)) {
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return $node;
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}
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$class = get_class($node);
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return new $class(
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$this->getEscaperFilter($type, $expression),
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$node->getLine()
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);
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}
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protected function preEscapeFilterNode(Twig_Node_Expression_Filter $filter, Twig_Environment $env)
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{
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$name = $filter->getNode('filter')->getAttribute('value');
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$type = $env->getFilter($name)->getPreEscape();
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if (null === $type) {
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return $filter;
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}
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$node = $filter->getNode('node');
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if ($this->isSafeFor($type, $node, $env)) {
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return $filter;
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}
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$filter->setNode('node', $this->getEscaperFilter($type, $node));
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return $filter;
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}
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protected function isSafeFor($type, Twig_NodeInterface $expression, $env)
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{
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$safe = $this->safeAnalysis->getSafe($expression);
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if (null === $safe) {
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if (null === $this->traverser) {
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$this->traverser = new Twig_NodeTraverser($env, array($this->safeAnalysis));
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}
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$this->safeAnalysis->setSafeVars($this->safeVars);
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$this->traverser->traverse($expression);
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$safe = $this->safeAnalysis->getSafe($expression);
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}
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return in_array($type, $safe) || in_array('all', $safe);
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}
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protected function needEscaping(Twig_Environment $env)
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{
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if (count($this->statusStack)) {
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return $this->statusStack[count($this->statusStack) - 1];
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}
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return $this->defaultStrategy ? $this->defaultStrategy : false;
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}
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protected function getEscaperFilter($type, Twig_NodeInterface $node)
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{
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$line = $node->getLine();
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$name = new Twig_Node_Expression_Constant('escape', $line);
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$args = new Twig_Node(array(new Twig_Node_Expression_Constant((string) $type, $line), new Twig_Node_Expression_Constant(null, $line), new Twig_Node_Expression_Constant(true, $line)));
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return new Twig_Node_Expression_Filter($node, $name, $args, $line);
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}
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/**
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* {@inheritdoc}
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*/
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public function getPriority()
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{
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return 0;
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}
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}
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