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<?php
/*
* This file is part of Twig.
*
* (c) 2009 Fabien Potencier
* (c) 2009 Armin Ronacher
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* Default parser implementation.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class Twig_Parser implements Twig_ParserInterface
{
protected $stack = array();
protected $stream;
protected $parent;
protected $handlers;
protected $visitors;
protected $expressionParser;
protected $blocks;
protected $blockStack;
protected $macros;
protected $env;
protected $reservedMacroNames;
protected $importedSymbols;
protected $traits;
protected $embeddedTemplates = array();
/**
* Constructor.
*
* @param Twig_Environment $env A Twig_Environment instance
*/
public function __construct(Twig_Environment $env)
{
$this->env = $env;
}
public function getEnvironment()
{
return $this->env;
}
public function getVarName()
{
return sprintf('__internal_%s', hash('sha256', uniqid(mt_rand(), true), false));
}
public function getFilename()
{
return $this->stream->getFilename();
}
/**
* {@inheritdoc}
*/
public function parse(Twig_TokenStream $stream, $test = null, $dropNeedle = false)
{
// push all variables into the stack to keep the current state of the parser
// using get_object_vars() instead of foreach would lead to https://bugs.php.net/71336
$vars = array();
foreach ($this as $k => $v) {
$vars[$k] = $v;
}
unset($vars['stack'], $vars['env'], $vars['handlers'], $vars['visitors'], $vars['expressionParser'], $vars['reservedMacroNames']);
$this->stack[] = $vars;
// tag handlers
if (null === $this->handlers) {
$this->handlers = $this->env->getTokenParsers();
$this->handlers->setParser($this);
}
// node visitors
if (null === $this->visitors) {
$this->visitors = $this->env->getNodeVisitors();
}
if (null === $this->expressionParser) {
$this->expressionParser = new Twig_ExpressionParser($this, $this->env->getUnaryOperators(), $this->env->getBinaryOperators());
}
$this->stream = $stream;
$this->parent = null;
$this->blocks = array();
$this->macros = array();
$this->traits = array();
$this->blockStack = array();
$this->importedSymbols = array(array());
$this->embeddedTemplates = array();
try {
$body = $this->subparse($test, $dropNeedle);
if (null !== $this->parent && null === $body = $this->filterBodyNodes($body)) {
$body = new Twig_Node();
}
} catch (Twig_Error_Syntax $e) {
if (!$e->getTemplateFile()) {
$e->setTemplateFile($this->getFilename());
}
if (!$e->getTemplateLine()) {
$e->setTemplateLine($this->stream->getCurrent()->getLine());
}
throw $e;
}
$node = new Twig_Node_Module(new Twig_Node_Body(array($body)), $this->parent, new Twig_Node($this->blocks), new Twig_Node($this->macros), new Twig_Node($this->traits), $this->embeddedTemplates, $this->getFilename());
$traverser = new Twig_NodeTraverser($this->env, $this->visitors);
$node = $traverser->traverse($node);
// restore previous stack so previous parse() call can resume working
foreach (array_pop($this->stack) as $key => $val) {
$this->$key = $val;
}
return $node;
}
public function subparse($test, $dropNeedle = false)
{
$lineno = $this->getCurrentToken()->getLine();
$rv = array();
while (!$this->stream->isEOF()) {
switch ($this->getCurrentToken()->getType()) {
case Twig_Token::TEXT_TYPE:
$token = $this->stream->next();
$rv[] = new Twig_Node_Text($token->getValue(), $token->getLine());
break;
case Twig_Token::VAR_START_TYPE:
$token = $this->stream->next();
$expr = $this->expressionParser->parseExpression();
$this->stream->expect(Twig_Token::VAR_END_TYPE);
$rv[] = new Twig_Node_Print($expr, $token->getLine());
break;
case Twig_Token::BLOCK_START_TYPE:
$this->stream->next();
$token = $this->getCurrentToken();
if ($token->getType() !== Twig_Token::NAME_TYPE) {
throw new Twig_Error_Syntax('A block must start with a tag name.', $token->getLine(), $this->getFilename());
}
if (null !== $test && call_user_func($test, $token)) {
if ($dropNeedle) {
$this->stream->next();
}
if (1 === count($rv)) {
return $rv[0];
}
return new Twig_Node($rv, array(), $lineno);
}
$subparser = $this->handlers->getTokenParser($token->getValue());
if (null === $subparser) {
if (null !== $test) {
$e = new Twig_Error_Syntax(sprintf('Unexpected "%s" tag', $token->getValue()), $token->getLine(), $this->getFilename());
if (is_array($test) && isset($test[0]) && $test[0] instanceof Twig_TokenParserInterface) {
$e->appendMessage(sprintf(' (expecting closing tag for the "%s" tag defined near line %s).', $test[0]->getTag(), $lineno));
}
} else {
$e = new Twig_Error_Syntax(sprintf('Unknown "%s" tag.', $token->getValue()), $token->getLine(), $this->getFilename());
$e->addSuggestions($token->getValue(), array_keys($this->env->getTags()));
}
throw $e;
}
$this->stream->next();
$node = $subparser->parse($token);
if (null !== $node) {
$rv[] = $node;
}
break;
default:
throw new Twig_Error_Syntax('Lexer or parser ended up in unsupported state.', 0, $this->getFilename());
}
}
if (1 === count($rv)) {
return $rv[0];
}
return new Twig_Node($rv, array(), $lineno);
}
public function addHandler($name, $class)
{
$this->handlers[$name] = $class;
}
public function addNodeVisitor(Twig_NodeVisitorInterface $visitor)
{
$this->visitors[] = $visitor;
}
public function getBlockStack()
{
return $this->blockStack;
}
public function peekBlockStack()
{
return $this->blockStack[count($this->blockStack) - 1];
}
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, Twig_Node_Block $value)
{
$this->blocks[$name] = new Twig_Node_Body(array($value), array(), $value->getLine());
}
public function hasMacro($name)
{
return isset($this->macros[$name]);
}
public function setMacro($name, Twig_Node_Macro $node)
{
if ($this->isReservedMacroName($name)) {
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());
}
$this->macros[$name] = $node;
}
public function isReservedMacroName($name)
{
if (null === $this->reservedMacroNames) {
$this->reservedMacroNames = array();
$r = new ReflectionClass($this->env->getBaseTemplateClass());
foreach ($r->getMethods() as $method) {
$methodName = strtolower($method->getName());
if ('get' === substr($methodName, 0, 3) && isset($methodName[3])) {
$this->reservedMacroNames[] = substr($methodName, 3);
}
}
}
return in_array(strtolower($name), $this->reservedMacroNames);
}
public function addTrait($trait)
{
$this->traits[] = $trait;
}
public function hasTraits()
{
return count($this->traits) > 0;
}
public function embedTemplate(Twig_Node_Module $template)
{
$template->setIndex(mt_rand());
$this->embeddedTemplates[] = $template;
}
public function addImportedSymbol($type, $alias, $name = null, Twig_Node_Expression $node = null)
{
$this->importedSymbols[0][$type][$alias] = array('name' => $name, 'node' => $node);
}
public function getImportedSymbol($type, $alias)
{
foreach ($this->importedSymbols as $functions) {
if (isset($functions[$type][$alias])) {
return $functions[$type][$alias];
}
}
}
public function isMainScope()
{
return 1 === count($this->importedSymbols);
}
public function pushLocalScope()
{
array_unshift($this->importedSymbols, array());
}
public function popLocalScope()
{
array_shift($this->importedSymbols);
}
/**
* Gets the expression parser.
*
* @return Twig_ExpressionParser The expression parser
*/
public function getExpressionParser()
{
return $this->expressionParser;
}
public function getParent()
{
return $this->parent;
}
public function setParent($parent)
{
$this->parent = $parent;
}
/**
* Gets the token stream.
*
* @return Twig_TokenStream The token stream
*/
public function getStream()
{
return $this->stream;
}
/**
* Gets the current token.
*
* @return Twig_Token The current token
*/
public function getCurrentToken()
{
return $this->stream->getCurrent();
}
protected function filterBodyNodes(Twig_NodeInterface $node)
{
// check that the body does not contain non-empty output nodes
if (
($node instanceof Twig_Node_Text && !ctype_space($node->getAttribute('data')))
||
(!$node instanceof Twig_Node_Text && !$node instanceof Twig_Node_BlockReference && $node instanceof Twig_NodeOutputInterface)
) {
if (false !== strpos((string) $node, chr(0xEF).chr(0xBB).chr(0xBF))) {
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());
}
throw new Twig_Error_Syntax('A template that extends another one cannot have a body.', $node->getLine(), $this->getFilename());
}
// bypass "set" nodes as they "capture" the output
if ($node instanceof Twig_Node_Set) {
return $node;
}
if ($node instanceof Twig_NodeOutputInterface) {
return;
}
foreach ($node as $k => $n) {
if (null !== $n && null === $this->filterBodyNodes($n)) {
$node->removeNode($k);
}
}
return $node;
}
}