140 lines
4.5 KiB
PHP
140 lines
4.5 KiB
PHP
<?php
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/*
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* This file is part of Twig.
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*
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* (c) 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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namespace Twig\NodeVisitor;
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use Twig\Environment;
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use Twig\Node\CheckSecurityCallNode;
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use Twig\Node\CheckSecurityNode;
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use Twig\Node\CheckToStringNode;
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use Twig\Node\Expression\Binary\ConcatBinary;
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use Twig\Node\Expression\Binary\RangeBinary;
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use Twig\Node\Expression\FilterExpression;
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use Twig\Node\Expression\FunctionExpression;
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use Twig\Node\Expression\GetAttrExpression;
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use Twig\Node\Expression\NameExpression;
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use Twig\Node\ModuleNode;
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use Twig\Node\Node;
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use Twig\Node\PrintNode;
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use Twig\Node\SetNode;
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/**
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* @author Fabien Potencier <fabien@symfony.com>
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*
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* @internal
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*/
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final class SandboxNodeVisitor implements NodeVisitorInterface
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{
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private $inAModule = false;
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/** @var array<string, int> */
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private $tags;
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/** @var array<string, int> */
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private $filters;
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/** @var array<string, int> */
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private $functions;
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private $needsToStringWrap = false;
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public function enterNode(Node $node, Environment $env): Node
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{
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if ($node instanceof ModuleNode) {
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$this->inAModule = true;
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$this->tags = [];
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$this->filters = [];
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$this->functions = [];
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return $node;
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} elseif ($this->inAModule) {
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// look for tags
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if ($node->getNodeTag() && !isset($this->tags[$node->getNodeTag()])) {
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$this->tags[$node->getNodeTag()] = $node->getTemplateLine();
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}
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// look for filters
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if ($node instanceof FilterExpression && !isset($this->filters[$node->getNode('filter')->getAttribute('value')])) {
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$this->filters[$node->getNode('filter')->getAttribute('value')] = $node->getTemplateLine();
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}
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// look for functions
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if ($node instanceof FunctionExpression && !isset($this->functions[$node->getAttribute('name')])) {
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$this->functions[$node->getAttribute('name')] = $node->getTemplateLine();
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}
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// the .. operator is equivalent to the range() function
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if ($node instanceof RangeBinary && !isset($this->functions['range'])) {
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$this->functions['range'] = $node->getTemplateLine();
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}
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if ($node instanceof PrintNode) {
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$this->needsToStringWrap = true;
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$this->wrapNode($node, 'expr');
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}
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if ($node instanceof SetNode && !$node->getAttribute('capture')) {
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$this->needsToStringWrap = true;
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}
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// wrap outer nodes that can implicitly call __toString()
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if ($this->needsToStringWrap) {
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if ($node instanceof ConcatBinary) {
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$this->wrapNode($node, 'left');
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$this->wrapNode($node, 'right');
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}
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if ($node instanceof FilterExpression) {
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$this->wrapNode($node, 'node');
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$this->wrapArrayNode($node, 'arguments');
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}
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if ($node instanceof FunctionExpression) {
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$this->wrapArrayNode($node, 'arguments');
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}
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}
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}
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return $node;
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}
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public function leaveNode(Node $node, Environment $env): ?Node
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{
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if ($node instanceof ModuleNode) {
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$this->inAModule = false;
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$node->setNode('constructor_end', new Node([new CheckSecurityCallNode(), $node->getNode('constructor_end')]));
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$node->setNode('class_end', new Node([new CheckSecurityNode($this->filters, $this->tags, $this->functions), $node->getNode('class_end')]));
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} elseif ($this->inAModule) {
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if ($node instanceof PrintNode || $node instanceof SetNode) {
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$this->needsToStringWrap = false;
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}
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}
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return $node;
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}
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private function wrapNode(Node $node, string $name): void
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{
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$expr = $node->getNode($name);
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if (($expr instanceof NameExpression || $expr instanceof GetAttrExpression) && !$expr->isGenerator()) {
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$node->setNode($name, new CheckToStringNode($expr));
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}
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}
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private function wrapArrayNode(Node $node, string $name): void
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{
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$args = $node->getNode($name);
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foreach ($args as $name => $_) {
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$this->wrapNode($args, $name);
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}
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}
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public function getPriority(): int
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{
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return 0;
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}
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}
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