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394 lines
12 KiB
394 lines
12 KiB
<?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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* (c) 2009 Armin Ronacher
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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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* Default parser implementation.
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*
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* @author Fabien Potencier <[email protected]>
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*/
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class Twig_Parser implements Twig_ParserInterface
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{
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protected $stack = array();
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protected $stream;
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protected $parent;
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protected $handlers;
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protected $visitors;
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protected $expressionParser;
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protected $blocks;
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protected $blockStack;
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protected $macros;
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protected $env;
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protected $reservedMacroNames;
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protected $importedSymbols;
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protected $traits;
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protected $embeddedTemplates = array();
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/**
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* Constructor.
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*
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* @param Twig_Environment $env A Twig_Environment instance
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*/
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public function __construct(Twig_Environment $env)
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{
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$this->env = $env;
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}
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public function getEnvironment()
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{
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return $this->env;
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}
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public function getVarName()
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{
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return sprintf('__internal_%s', hash('sha256', uniqid(mt_rand(), true), false));
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}
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public function getFilename()
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{
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return $this->stream->getFilename();
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}
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/**
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* Converts a token stream to a node tree.
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*
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* @param Twig_TokenStream $stream A token stream instance
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*
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* @return Twig_Node_Module A node tree
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*/
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public function parse(Twig_TokenStream $stream, $test = null, $dropNeedle = false)
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{
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// push all variables into the stack to keep the current state of the parser
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$vars = get_object_vars($this);
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unset($vars['stack'], $vars['env'], $vars['handlers'], $vars['visitors'], $vars['expressionParser']);
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$this->stack[] = $vars;
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// tag handlers
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if (null === $this->handlers) {
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$this->handlers = $this->env->getTokenParsers();
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$this->handlers->setParser($this);
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}
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// node visitors
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if (null === $this->visitors) {
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$this->visitors = $this->env->getNodeVisitors();
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}
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if (null === $this->expressionParser) {
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$this->expressionParser = new Twig_ExpressionParser($this, $this->env->getUnaryOperators(), $this->env->getBinaryOperators());
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}
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$this->stream = $stream;
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$this->parent = null;
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$this->blocks = array();
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$this->macros = array();
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$this->traits = array();
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$this->blockStack = array();
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$this->importedSymbols = array(array());
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$this->embeddedTemplates = array();
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try {
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$body = $this->subparse($test, $dropNeedle);
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if (null !== $this->parent) {
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if (null === $body = $this->filterBodyNodes($body)) {
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$body = new Twig_Node();
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}
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}
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} catch (Twig_Error_Syntax $e) {
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if (!$e->getTemplateFile()) {
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$e->setTemplateFile($this->getFilename());
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}
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if (!$e->getTemplateLine()) {
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$e->setTemplateLine($this->stream->getCurrent()->getLine());
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}
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throw $e;
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}
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$node = new Twig_Node_Module(new Twig_Node_Body(array($body)), $this->parent, new Twig_Node($this->blocks), new Twig_Node($this->macros), new Twig_Node($this->traits), $this->embeddedTemplates, $this->getFilename());
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$traverser = new Twig_NodeTraverser($this->env, $this->visitors);
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$node = $traverser->traverse($node);
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// restore previous stack so previous parse() call can resume working
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foreach (array_pop($this->stack) as $key => $val) {
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$this->$key = $val;
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}
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return $node;
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}
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public function subparse($test, $dropNeedle = false)
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{
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$lineno = $this->getCurrentToken()->getLine();
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$rv = array();
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while (!$this->stream->isEOF()) {
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switch ($this->getCurrentToken()->getType()) {
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case Twig_Token::TEXT_TYPE:
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$token = $this->stream->next();
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$rv[] = new Twig_Node_Text($token->getValue(), $token->getLine());
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break;
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case Twig_Token::VAR_START_TYPE:
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$token = $this->stream->next();
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$expr = $this->expressionParser->parseExpression();
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$this->stream->expect(Twig_Token::VAR_END_TYPE);
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$rv[] = new Twig_Node_Print($expr, $token->getLine());
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break;
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case Twig_Token::BLOCK_START_TYPE:
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$this->stream->next();
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$token = $this->getCurrentToken();
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if ($token->getType() !== Twig_Token::NAME_TYPE) {
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throw new Twig_Error_Syntax('A block must start with a tag name', $token->getLine(), $this->getFilename());
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}
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if (null !== $test && call_user_func($test, $token)) {
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if ($dropNeedle) {
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$this->stream->next();
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}
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if (1 === count($rv)) {
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return $rv[0];
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}
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return new Twig_Node($rv, array(), $lineno);
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}
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$subparser = $this->handlers->getTokenParser($token->getValue());
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if (null === $subparser) {
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if (null !== $test) {
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$error = sprintf('Unexpected tag name "%s"', $token->getValue());
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if (is_array($test) && isset($test[0]) && $test[0] instanceof Twig_TokenParserInterface) {
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$error .= sprintf(' (expecting closing tag for the "%s" tag defined near line %s)', $test[0]->getTag(), $lineno);
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}
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throw new Twig_Error_Syntax($error, $token->getLine(), $this->getFilename());
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}
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$message = sprintf('Unknown tag name "%s"', $token->getValue());
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if ($alternatives = $this->env->computeAlternatives($token->getValue(), array_keys($this->env->getTags()))) {
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$message = sprintf('%s. Did you mean "%s"', $message, implode('", "', $alternatives));
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}
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throw new Twig_Error_Syntax($message, $token->getLine(), $this->getFilename());
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}
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$this->stream->next();
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$node = $subparser->parse($token);
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if (null !== $node) {
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$rv[] = $node;
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}
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break;
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default:
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throw new Twig_Error_Syntax('Lexer or parser ended up in unsupported state.', 0, $this->getFilename());
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}
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}
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if (1 === count($rv)) {
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return $rv[0];
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}
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return new Twig_Node($rv, array(), $lineno);
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}
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public function addHandler($name, $class)
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{
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$this->handlers[$name] = $class;
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}
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public function addNodeVisitor(Twig_NodeVisitorInterface $visitor)
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{
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$this->visitors[] = $visitor;
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}
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public function getBlockStack()
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{
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return $this->blockStack;
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}
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public function peekBlockStack()
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{
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return $this->blockStack[count($this->blockStack) - 1];
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}
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public function popBlockStack()
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{
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array_pop($this->blockStack);
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}
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public function pushBlockStack($name)
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{
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$this->blockStack[] = $name;
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}
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public function hasBlock($name)
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{
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return isset($this->blocks[$name]);
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}
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public function getBlock($name)
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{
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return $this->blocks[$name];
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}
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public function setBlock($name, $value)
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{
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$this->blocks[$name] = new Twig_Node_Body(array($value), array(), $value->getLine());
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}
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public function hasMacro($name)
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{
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return isset($this->macros[$name]);
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}
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public function setMacro($name, Twig_Node_Macro $node)
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{
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if (null === $this->reservedMacroNames) {
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$this->reservedMacroNames = array();
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$r = new ReflectionClass($this->env->getBaseTemplateClass());
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foreach ($r->getMethods() as $method) {
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$this->reservedMacroNames[] = $method->getName();
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}
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}
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if (in_array($name, $this->reservedMacroNames)) {
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throw new Twig_Error_Syntax(sprintf('"%s" cannot be used as a macro name as it is a reserved keyword', $name), $node->getLine(), $this->getFilename());
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}
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$this->macros[$name] = $node;
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}
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public function addTrait($trait)
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{
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$this->traits[] = $trait;
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}
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public function hasTraits()
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{
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return count($this->traits) > 0;
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}
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public function embedTemplate(Twig_Node_Module $template)
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{
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$template->setIndex(mt_rand());
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$this->embeddedTemplates[] = $template;
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}
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public function addImportedSymbol($type, $alias, $name = null, Twig_Node_Expression $node = null)
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{
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$this->importedSymbols[0][$type][$alias] = array('name' => $name, 'node' => $node);
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}
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public function getImportedSymbol($type, $alias)
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{
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foreach ($this->importedSymbols as $functions) {
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if (isset($functions[$type][$alias])) {
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return $functions[$type][$alias];
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}
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}
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}
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public function isMainScope()
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{
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return 1 === count($this->importedSymbols);
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}
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public function pushLocalScope()
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{
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array_unshift($this->importedSymbols, array());
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}
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public function popLocalScope()
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{
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array_shift($this->importedSymbols);
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}
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/**
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* Gets the expression parser.
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*
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* @return Twig_ExpressionParser The expression parser
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*/
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public function getExpressionParser()
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{
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return $this->expressionParser;
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}
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public function getParent()
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{
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return $this->parent;
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}
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public function setParent($parent)
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{
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$this->parent = $parent;
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}
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/**
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* Gets the token stream.
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*
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* @return Twig_TokenStream The token stream
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*/
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public function getStream()
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{
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return $this->stream;
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}
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/**
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* Gets the current token.
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*
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* @return Twig_Token The current token
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*/
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public function getCurrentToken()
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{
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return $this->stream->getCurrent();
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}
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protected function filterBodyNodes(Twig_NodeInterface $node)
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{
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// check that the body does not contain non-empty output nodes
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if (
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($node instanceof Twig_Node_Text && !ctype_space($node->getAttribute('data')))
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||
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(!$node instanceof Twig_Node_Text && !$node instanceof Twig_Node_BlockReference && $node instanceof Twig_NodeOutputInterface)
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) {
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if (false !== strpos((string) $node, chr(0xEF).chr(0xBB).chr(0xBF))) {
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throw new Twig_Error_Syntax('A template that extends another one cannot have a body but a byte order mark (BOM) has been detected; it must be removed.', $node->getLine(), $this->getFilename());
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}
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throw new Twig_Error_Syntax('A template that extends another one cannot have a body.', $node->getLine(), $this->getFilename());
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}
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// bypass "set" nodes as they "capture" the output
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if ($node instanceof Twig_Node_Set) {
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return $node;
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}
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if ($node instanceof Twig_NodeOutputInterface) {
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return;
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}
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foreach ($node as $k => $n) {
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if (null !== $n && null === $n = $this->filterBodyNodes($n)) {
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$node->removeNode($k);
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}
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}
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return $node;
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}
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}
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