vendor/twig/twig/src/Parser.php line 184
<?php/** This file is part of Twig.** (c) Fabien Potencier* (c) Armin Ronacher** For the full copyright and license information, please view the LICENSE* file that was distributed with this source code.*/namespace Twig;use Twig\Error\SyntaxError;use Twig\Node\BlockNode;use Twig\Node\BlockReferenceNode;use Twig\Node\BodyNode;use Twig\Node\Expression\AbstractExpression;use Twig\Node\MacroNode;use Twig\Node\ModuleNode;use Twig\Node\Node;use Twig\Node\NodeCaptureInterface;use Twig\Node\NodeOutputInterface;use Twig\Node\PrintNode;use Twig\Node\SpacelessNode;use Twig\Node\TextNode;use Twig\TokenParser\TokenParserInterface;/*** Default parser implementation.** @author Fabien Potencier <fabien@symfony.com>*/class Parser{private $stack = [];private $stream;private $parent;private $handlers;private $visitors;private $expressionParser;private $blocks;private $blockStack;private $macros;private $env;private $importedSymbols;private $traits;private $embeddedTemplates = [];private $varNameSalt = 0;public function __construct(Environment $env){$this->env = $env;}public function getVarName(){return sprintf('__internal_parse_%d', $this->varNameSalt++);}public function parse(TokenStream $stream, $test = null, $dropNeedle = false){$vars = get_object_vars($this);unset($vars['stack'], $vars['env'], $vars['handlers'], $vars['visitors'], $vars['expressionParser'], $vars['reservedMacroNames'], $vars['varNameSalt']);$this->stack[] = $vars;// tag handlersif (null === $this->handlers) {$this->handlers = [];foreach ($this->env->getTokenParsers() as $handler) {$handler->setParser($this);$this->handlers[$handler->getTag()] = $handler;}}// node visitorsif (null === $this->visitors) {$this->visitors = $this->env->getNodeVisitors();}if (null === $this->expressionParser) {$this->expressionParser = new ExpressionParser($this, $this->env);}$this->stream = $stream;$this->parent = null;$this->blocks = [];$this->macros = [];$this->traits = [];$this->blockStack = [];$this->importedSymbols = [[]];$this->embeddedTemplates = [];try {$body = $this->subparse($test, $dropNeedle);if (null !== $this->parent && null === $body = $this->filterBodyNodes($body)) {$body = new Node();}} catch (SyntaxError $e) {if (!$e->getSourceContext()) {$e->setSourceContext($this->stream->getSourceContext());}if (!$e->getTemplateLine()) {$e->setTemplateLine($this->stream->getCurrent()->getLine());}throw $e;}$node = new ModuleNode(new BodyNode([$body]), $this->parent, new Node($this->blocks), new Node($this->macros), new Node($this->traits), $this->embeddedTemplates, $stream->getSourceContext());$traverser = new NodeTraverser($this->env, $this->visitors);$node = $traverser->traverse($node);// restore previous stack so previous parse() call can resume workingforeach (array_pop($this->stack) as $key => $val) {$this->$key = $val;}return $node;}public function subparse($test, $dropNeedle = false){$lineno = $this->getCurrentToken()->getLine();$rv = [];while (!$this->stream->isEOF()) {switch ($this->getCurrentToken()->getType()) {case /* Token::TEXT_TYPE */ 0:$token = $this->stream->next();$rv[] = new TextNode($token->getValue(), $token->getLine());break;case /* Token::VAR_START_TYPE */ 2:$token = $this->stream->next();$expr = $this->expressionParser->parseExpression();$this->stream->expect(/* Token::VAR_END_TYPE */ 4);$rv[] = new PrintNode($expr, $token->getLine());break;case /* Token::BLOCK_START_TYPE */ 1:$this->stream->next();$token = $this->getCurrentToken();if (/* Token::NAME_TYPE */ 5 !== $token->getType()) {throw new SyntaxError('A block must start with a tag name.', $token->getLine(), $this->stream->getSourceContext());}if (null !== $test && $test($token)) {if ($dropNeedle) {$this->stream->next();}if (1 === \count($rv)) {return $rv[0];}return new Node($rv, [], $lineno);}if (!isset($this->handlers[$token->getValue()])) {if (null !== $test) {$e = new SyntaxError(sprintf('Unexpected "%s" tag', $token->getValue()), $token->getLine(), $this->stream->getSourceContext());if (\is_array($test) && isset($test[0]) && $test[0] instanceof TokenParserInterface) {$e->appendMessage(sprintf(' (expecting closing tag for the "%s" tag defined near line %s).', $test[0]->getTag(), $lineno));}} else {$e = new SyntaxError(sprintf('Unknown "%s" tag.', $token->getValue()), $token->getLine(), $this->stream->getSourceContext());$e->addSuggestions($token->getValue(), array_keys($this->env->getTags()));}throw $e;}$this->stream->next();$subparser = $this->handlers[$token->getValue()];$node = $subparser->parse($token);if (null !== $node) {$rv[] = $node;}break;default:throw new SyntaxError('Lexer or parser ended up in unsupported state.', $this->getCurrentToken()->getLine(), $this->stream->getSourceContext());}}if (1 === \count($rv)) {return $rv[0];}return new Node($rv, [], $lineno);}public function getBlockStack(){return $this->blockStack;}public function peekBlockStack(){return isset($this->blockStack[\count($this->blockStack) - 1]) ? $this->blockStack[\count($this->blockStack) - 1] : null;}public function popBlockStack(){array_pop($this->blockStack);}public function pushBlockStack($name){$this->blockStack[] = $name;}public function hasBlock($name){return isset($this->blocks[$name]);}public function getBlock($name){return $this->blocks[$name];}public function setBlock($name, BlockNode $value){$this->blocks[$name] = new BodyNode([$value], [], $value->getTemplateLine());}public function hasMacro($name){return isset($this->macros[$name]);}public function setMacro($name, MacroNode $node){$this->macros[$name] = $node;}/*** @deprecated since Twig 2.7 as there are no reserved macro names anymore, will be removed in 3.0.*/public function isReservedMacroName($name){@trigger_error(sprintf('The "%s" method is deprecated since Twig 2.7 and will be removed in 3.0.', __METHOD__), \E_USER_DEPRECATED);return false;}public function addTrait($trait){$this->traits[] = $trait;}public function hasTraits(){return \count($this->traits) > 0;}public function embedTemplate(ModuleNode $template){$template->setIndex(mt_rand());$this->embeddedTemplates[] = $template;}public function addImportedSymbol($type, $alias, $name = null, AbstractExpression $node = null){$this->importedSymbols[0][$type][$alias] = ['name' => $name, 'node' => $node];}public function getImportedSymbol($type, $alias){// if the symbol does not exist in the current scope (0), try in the main/global scope (last index)return $this->importedSymbols[0][$type][$alias] ?? ($this->importedSymbols[\count($this->importedSymbols) - 1][$type][$alias] ?? null);}public function isMainScope(){return 1 === \count($this->importedSymbols);}public function pushLocalScope(){array_unshift($this->importedSymbols, []);}public function popLocalScope(){array_shift($this->importedSymbols);}/*** @return ExpressionParser*/public function getExpressionParser(){return $this->expressionParser;}public function getParent(){return $this->parent;}public function setParent($parent){$this->parent = $parent;}/*** @return TokenStream*/public function getStream(){return $this->stream;}/*** @return Token*/public function getCurrentToken(){return $this->stream->getCurrent();}private function filterBodyNodes(Node $node, bool $nested = false){// check that the body does not contain non-empty output nodesif (($node instanceof TextNode && !ctype_space($node->getAttribute('data')))||// the "&& !$node instanceof SpacelessNode" part of the condition must be removed in 3.0(!$node instanceof TextNode && !$node instanceof BlockReferenceNode && ($node instanceof NodeOutputInterface && !$node instanceof SpacelessNode))) {if (false !== strpos((string) $node, \chr(0xEF).\chr(0xBB).\chr(0xBF))) {$t = substr($node->getAttribute('data'), 3);if ('' === $t || ctype_space($t)) {// bypass empty nodes starting with a BOMreturn;}}throw new SyntaxError('A template that extends another one cannot include content outside Twig blocks. Did you forget to put the content inside a {% block %} tag?', $node->getTemplateLine(), $this->stream->getSourceContext());}// bypass nodes that "capture" the outputif ($node instanceof NodeCaptureInterface) {// a "block" tag in such a node will serve as a block definition AND be displayed in place as wellreturn $node;}// to be removed completely in Twig 3.0if (!$nested && $node instanceof SpacelessNode) {@trigger_error(sprintf('Using the spaceless tag at the root level of a child template in "%s" at line %d is deprecated since Twig 2.5.0 and will become a syntax error in 3.0.', $this->stream->getSourceContext()->getName(), $node->getTemplateLine()), \E_USER_DEPRECATED);}// "block" tags that are not captured (see above) are only used for defining// the content of the block. In such a case, nesting it does not work as// expected as the definition is not part of the default template code flow.if ($nested && ($node instanceof BlockReferenceNode || $node instanceof \Twig_Node_BlockReference)) {//throw new SyntaxError('A block definition cannot be nested under non-capturing nodes.', $node->getTemplateLine(), $this->stream->getSourceContext());@trigger_error(sprintf('Nesting a block definition under a non-capturing node in "%s" at line %d is deprecated since Twig 2.5.0 and will become a syntax error in 3.0.', $this->stream->getSourceContext()->getName(), $node->getTemplateLine()), \E_USER_DEPRECATED);return;}// the "&& !$node instanceof SpacelessNode" part of the condition must be removed in 3.0if ($node instanceof NodeOutputInterface && !$node instanceof SpacelessNode) {return;}// here, $nested means "being at the root level of a child template"// we need to discard the wrapping "Twig_Node" for the "body" node$nested = $nested || ('Twig_Node' !== \get_class($node) && Node::class !== \get_class($node));foreach ($node as $k => $n) {if (null !== $n && null === $this->filterBodyNodes($n, $nested)) {$node->removeNode($k);}}return $node;}}class_alias('Twig\Parser', 'Twig_Parser');