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<?php |
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namespace MewesK\TwigSpreadsheetBundle\Twig\NodeVisitor; |
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use MewesK\TwigSpreadsheetBundle\Twig\Node\BaseNode; |
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use MewesK\TwigSpreadsheetBundle\Twig\Node\DocumentNode; |
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/** |
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* Class SyntaxCheckNodeVisitor. |
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*/ |
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class SyntaxCheckNodeVisitor extends \Twig_BaseNodeVisitor |
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{ |
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/** |
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* @var array |
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*/ |
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protected $path = []; |
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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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* {@inheritdoc} |
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* |
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* @throws \Twig_Error_Syntax |
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*/ |
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protected function doEnterNode(\Twig_Node $node, \Twig_Environment $env) |
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{ |
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try { |
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if ($node instanceof BaseNode) { |
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$this->checkAllowedParents($node); |
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} else { |
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$this->checkAllowedChildren($node); |
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} |
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} catch (\Twig_Error_Syntax $e) { |
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// reset path since throwing an error prevents doLeaveNode to be called |
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$this->path = []; |
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throw $e; |
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} |
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$this->path[] = $node !== null ? get_class($node) : null; |
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return $node; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function doLeaveNode(\Twig_Node $node, \ Twig_Environment $env) |
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{ |
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array_pop($this->path); |
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return $node; |
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} |
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/** |
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* @param \Twig_Node $node |
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* |
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* @throws \Twig_Error_Syntax |
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*/ |
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private function checkAllowedChildren(\Twig_Node $node) |
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{ |
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$hasDocumentNode = false; |
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$hasTextNodeBefore = false; |
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$hasTextNodeAfter = false; |
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/** |
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* @var \Twig_Node $currentNode |
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*/ |
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foreach ($node->getIterator() as $currentNode) { |
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if ($currentNode instanceof \Twig_Node_Text) { |
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if ($hasDocumentNode) { |
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$hasTextNodeAfter = true; |
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} else { |
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$hasTextNodeBefore = true; |
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} |
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} |
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if ($currentNode instanceof DocumentNode) { |
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$hasDocumentNode = true; |
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} |
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} |
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if ($hasDocumentNode) { |
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if ($hasTextNodeBefore) { |
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throw new \Twig_Error_Syntax(sprintf('Node "%s" is not allowed before Node "%s".', \Twig_Node_Text::class, DocumentNode::class)); |
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} |
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if ($hasTextNodeAfter) { |
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throw new \Twig_Error_Syntax(sprintf('Node "%s" is not allowed after Node "%s".', \Twig_Node_Text::class, DocumentNode::class)); |
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} |
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} |
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} |
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/** |
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* @param BaseNode $node |
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* |
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* @throws \Twig_Error_Syntax |
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*/ |
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private function checkAllowedParents(BaseNode $node) |
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{ |
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$parentName = null; |
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// find first parent from this bundle |
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foreach (array_reverse($this->path) as $className) { |
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if (strpos($className, 'MewesK\\TwigSpreadsheetBundle\\Twig\\Node\\') === 0) { |
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$parentName = $className; |
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break; |
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} |
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} |
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// allow no parents (e.g. macros, includes) |
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if ($parentName === null) { |
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return; |
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} |
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// check if parent is allowed |
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foreach ($node->getAllowedParents() as $className) { |
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if ($className === $parentName) { |
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return; |
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} |
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} |
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throw new \Twig_Error_Syntax(sprintf('Node "%s" is not allowed inside of Node "%s".', get_class($node), $parentName)); |
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} |
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} |
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MewesK /
TwigSpreadsheetBundle
