src/ExpressionParser.php
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 <?php
 
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 /*
  * 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.
  */
 
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 namespace Twig;
 
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 use Twig\Error\SyntaxError;
 use Twig\Node\Expression\ArrayExpression;
 use Twig\Node\Expression\AssignNameExpression;
 use Twig\Node\Expression\Binary\ConcatBinary;
 use Twig\Node\Expression\BlockReferenceExpression;
 use Twig\Node\Expression\ConditionalExpression;
 use Twig\Node\Expression\ConstantExpression;
 use Twig\Node\Expression\GetAttrExpression;
 use Twig\Node\Expression\MethodCallExpression;
 use Twig\Node\Expression\NameExpression;
 use Twig\Node\Expression\ParentExpression;
 use Twig\Node\Expression\Unary\NegUnary;
 use Twig\Node\Expression\Unary\NotUnary;
 use Twig\Node\Expression\Unary\PosUnary;
 use Twig\Node\Node;
 
 /**
  * Parses expressions.
  *
  * This parser implements a "Precedence climbing" algorithm.
  *
  * @see https://www.engr.mun.ca/~theo/Misc/exp_parsing.htm
  * @see https://en.wikipedia.org/wiki/Operator-precedence_parser
  *
  * @author Fabien Potencier <fabien@symfony.com>
  *
  * @internal
  */
 class ExpressionParser
 {
     const OPERATOR_LEFT = 1;
     const OPERATOR_RIGHT = 2;
 
     protected $parser;
     protected $unaryOperators;
     protected $binaryOperators;
 
     private $env;
 
     public function __construct(Parser $parser, $env = null)
     {
         $this->parser = $parser;
 
         if ($env instanceof Environment) {
             $this->env = $env;
             $this->unaryOperators = $env->getUnaryOperators();
             $this->binaryOperators = $env->getBinaryOperators();
         } else {
             @trigger_error('Passing the operators as constructor arguments to '.__METHOD__.' is deprecated since version 1.27. Pass the environment instead.', E_USER_DEPRECATED);
 
             $this->env = $parser->getEnvironment();
             $this->unaryOperators = func_get_arg(1);
             $this->binaryOperators = func_get_arg(2);
         }
     }
 
     public function parseExpression($precedence = 0)
     {
         $expr = $this->getPrimary();
         $token = $this->parser->getCurrentToken();
         while ($this->isBinary($token) && $this->binaryOperators[$token->getValue()]['precedence'] >= $precedence) {
             $op = $this->binaryOperators[$token->getValue()];
             $this->parser->getStream()->next();
 
             if ('is not' === $token->getValue()) {
                 $expr = $this->parseNotTestExpression($expr);
             } elseif ('is' === $token->getValue()) {
                 $expr = $this->parseTestExpression($expr);
             } elseif (isset($op['callable'])) {
                 $expr = \call_user_func($op['callable'], $this->parser, $expr);
             } else {
                 $expr1 = $this->parseExpression(self::OPERATOR_LEFT === $op['associativity'] ? $op['precedence'] + 1 : $op['precedence']);
                 $class = $op['class'];
                 $expr = new $class($expr, $expr1, $token->getLine());
             }
 
             $token = $this->parser->getCurrentToken();
         }
 
         if (0 === $precedence) {
             return $this->parseConditionalExpression($expr);
         }
 
         return $expr;
     }
 
     protected function getPrimary()
     {
         $token = $this->parser->getCurrentToken();
 
         if ($this->isUnary($token)) {
             $operator = $this->unaryOperators[$token->getValue()];
             $this->parser->getStream()->next();
             $expr = $this->parseExpression($operator['precedence']);
             $class = $operator['class'];
 
             return $this->parsePostfixExpression(new $class($expr, $token->getLine()));
         } elseif ($token->test(Token::PUNCTUATION_TYPE, '(')) {
             $this->parser->getStream()->next();
             $expr = $this->parseExpression();
             $this->parser->getStream()->expect(Token::PUNCTUATION_TYPE, ')', 'An opened parenthesis is not properly closed');
 
             return $this->parsePostfixExpression($expr);
         }
 
         return $this->parsePrimaryExpression();
     }
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     protected function parseConditionalExpression($expr)
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     {
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         while ($this->parser->getStream()->nextIf(Token::PUNCTUATION_TYPE, '?')) {
             if (!$this->parser->getStream()->nextIf(Token::PUNCTUATION_TYPE, ':')) {
                 $expr2 = $this->parseExpression();
                 if ($this->parser->getStream()->nextIf(Token::PUNCTUATION_TYPE, ':')) {
                     $expr3 = $this->parseExpression();
                 } else {
                     $expr3 = new ConstantExpression('', $this->parser->getCurrentToken()->getLine());
                 }
             } else {
                 $expr2 = $expr;
                 $expr3 = $this->parseExpression();
             }
 
             $expr = new ConditionalExpression($expr, $expr2, $expr3, $this->parser->getCurrentToken()->getLine());
         }
 
         return $expr;
     }
 
     protected function isUnary(Token $token)
     {
         return $token->test(Token::OPERATOR_TYPE) && isset($this->unaryOperators[$token->getValue()]);
     }
 
     protected function isBinary(Token $token)
     {
         return $token->test(Token::OPERATOR_TYPE) && isset($this->binaryOperators[$token->getValue()]);
     }
 
     public function parsePrimaryExpression()
     {
         $token = $this->parser->getCurrentToken();
         switch ($token->getType()) {
             case Token::NAME_TYPE:
                 $this->parser->getStream()->next();
                 switch ($token->getValue()) {
                     case 'true':
                     case 'TRUE':
                         $node = new ConstantExpression(true, $token->getLine());
                         break;
 
                     case 'false':
                     case 'FALSE':
                         $node = new ConstantExpression(false, $token->getLine());
                         break;
 
                     case 'none':
                     case 'NONE':
                     case 'null':
                     case 'NULL':
                         $node = new ConstantExpression(null, $token->getLine());
                         break;
 
                     default:
                         if ('(' === $this->parser->getCurrentToken()->getValue()) {
                             $node = $this->getFunctionNode($token->getValue(), $token->getLine());
                         } else {
                             $node = new NameExpression($token->getValue(), $token->getLine());
                         }
                 }
                 break;
 
             case Token::NUMBER_TYPE:
                 $this->parser->getStream()->next();
                 $node = new ConstantExpression($token->getValue(), $token->getLine());
                 break;
 
             case Token::STRING_TYPE:
             case Token::INTERPOLATION_START_TYPE:
                 $node = $this->parseStringExpression();
                 break;
 
             case Token::OPERATOR_TYPE:
                 if (preg_match(Lexer::REGEX_NAME, $token->getValue(), $matches) && $matches[0] == $token->getValue()) {
                     // in this context, string operators are variable names
                     $this->parser->getStream()->next();
                     $node = new NameExpression($token->getValue(), $token->getLine());
                     break;
                 } elseif (isset($this->unaryOperators[$token->getValue()])) {
                     $class = $this->unaryOperators[$token->getValue()]['class'];
 
                     $ref = new \ReflectionClass($class);
                     $negClass = 'Twig\Node\Expression\Unary\NegUnary';
                     $posClass = 'Twig\Node\Expression\Unary\PosUnary';
                     if (!(\in_array($ref->getName(), [$negClass, $posClass, 'Twig_Node_Expression_Unary_Neg', 'Twig_Node_Expression_Unary_Pos'])
                         || $ref->isSubclassOf($negClass) || $ref->isSubclassOf($posClass)
                         || $ref->isSubclassOf('Twig_Node_Expression_Unary_Neg') || $ref->isSubclassOf('Twig_Node_Expression_Unary_Pos'))
                     ) {
                         throw new SyntaxError(sprintf('Unexpected unary operator "%s".', $token->getValue()), $token->getLine(), $this->parser->getStream()->getSourceContext());
                     }
 
                     $this->parser->getStream()->next();
                     $expr = $this->parsePrimaryExpression();
 
                     $node = new $class($expr, $token->getLine());
                     break;
                 }
 
                 // no break
             default:
                 if ($token->test(Token::PUNCTUATION_TYPE, '[')) {
                     $node = $this->parseArrayExpression();
                 } elseif ($token->test(Token::PUNCTUATION_TYPE, '{')) {
                     $node = $this->parseHashExpression();
                 } elseif ($token->test(Token::OPERATOR_TYPE, '=') && ('==' === $this->parser->getStream()->look(-1)->getValue() || '!=' === $this->parser->getStream()->look(-1)->getValue())) {
                     throw new SyntaxError(sprintf('Unexpected operator of value "%s". Did you try to use "===" or "!==" for strict comparison? Use "is same as(value)" instead.', $token->getValue()), $token->getLine(), $this->parser->getStream()->getSourceContext());
                 } else {
                     throw new SyntaxError(sprintf('Unexpected token "%s" of value "%s".', Token::typeToEnglish($token->getType()), $token->getValue()), $token->getLine(), $this->parser->getStream()->getSourceContext());
                 }
         }
 
         return $this->parsePostfixExpression($node);
     }
 
     public function parseStringExpression()
     {
         $stream = $this->parser->getStream();
 
         $nodes = [];
         // a string cannot be followed by another string in a single expression
         $nextCanBeString = true;
         while (true) {
             if ($nextCanBeString && $token = $stream->nextIf(Token::STRING_TYPE)) {
                 $nodes[] = new ConstantExpression($token->getValue(), $token->getLine());
                 $nextCanBeString = false;
             } elseif ($stream->nextIf(Token::INTERPOLATION_START_TYPE)) {
                 $nodes[] = $this->parseExpression();
                 $stream->expect(Token::INTERPOLATION_END_TYPE);
                 $nextCanBeString = true;
             } else {
                 break;
             }
         }
 
         $expr = array_shift($nodes);
         foreach ($nodes as $node) {
             $expr = new ConcatBinary($expr, $node, $node->getTemplateLine());
         }
 
         return $expr;
     }
 
     public function parseArrayExpression()
     {
         $stream = $this->parser->getStream();
         $stream->expect(Token::PUNCTUATION_TYPE, '[', 'An array element was expected');
 
         $node = new ArrayExpression([], $stream->getCurrent()->getLine());
         $first = true;
         while (!$stream->test(Token::PUNCTUATION_TYPE, ']')) {
             if (!$first) {
                 $stream->expect(Token::PUNCTUATION_TYPE, ',', 'An array element must be followed by a comma');
 
                 // trailing ,?
                 if ($stream->test(Token::PUNCTUATION_TYPE, ']')) {
                     break;
                 }
             }
             $first = false;
 
             $node->addElement($this->parseExpression());
         }
         $stream->expect(Token::PUNCTUATION_TYPE, ']', 'An opened array is not properly closed');
 
         return $node;
     }
 
     public function parseHashExpression()
     {
         $stream = $this->parser->getStream();
         $stream->expect(Token::PUNCTUATION_TYPE, '{', 'A hash element was expected');
 
         $node = new ArrayExpression([], $stream->getCurrent()->getLine());
         $first = true;
         while (!$stream->test(Token::PUNCTUATION_TYPE, '}')) {
             if (!$first) {
                 $stream->expect(Token::PUNCTUATION_TYPE, ',', 'A hash value must be followed by a comma');
 
                 // trailing ,?
                 if ($stream->test(Token::PUNCTUATION_TYPE, '}')) {
                     break;
                 }
             }
             $first = false;
 
             // a hash key can be:
             //
             //  * a number -- 12
             //  * a string -- 'a'
             //  * a name, which is equivalent to a string -- a
             //  * an expression, which must be enclosed in parentheses -- (1 + 2)
             if (($token = $stream->nextIf(Token::STRING_TYPE)) || ($token = $stream->nextIf(Token::NAME_TYPE)) || $token = $stream->nextIf(Token::NUMBER_TYPE)) {
                 $key = new ConstantExpression($token->getValue(), $token->getLine());
             } elseif ($stream->test(Token::PUNCTUATION_TYPE, '(')) {
                 $key = $this->parseExpression();
             } else {
                 $current = $stream->getCurrent();
 
                 throw new SyntaxError(sprintf('A hash key must be a quoted string, a number, a name, or an expression enclosed in parentheses (unexpected token "%s" of value "%s".', Token::typeToEnglish($current->getType()), $current->getValue()), $current->getLine(), $stream->getSourceContext());
             }
 
             $stream->expect(Token::PUNCTUATION_TYPE, ':', 'A hash key must be followed by a colon (:)');
             $value = $this->parseExpression();
 
             $node->addElement($value, $key);
         }
         $stream->expect(Token::PUNCTUATION_TYPE, '}', 'An opened hash is not properly closed');
 
         return $node;
     }
 
     public function parsePostfixExpression($node)
     {
         while (true) {
             $token = $this->parser->getCurrentToken();
             if (Token::PUNCTUATION_TYPE == $token->getType()) {
                 if ('.' == $token->getValue() || '[' == $token->getValue()) {
                     $node = $this->parseSubscriptExpression($node);
                 } elseif ('|' == $token->getValue()) {
                     $node = $this->parseFilterExpression($node);
                 } else {
                     break;
                 }
             } else {
                 break;
             }
         }
 
         return $node;
     }
 
     public function getFunctionNode($name, $line)
     {
         switch ($name) {
             case 'parent':
                 $this->parseArguments();
                 if (!\count($this->parser->getBlockStack())) {
                     throw new SyntaxError('Calling "parent" outside a block is forbidden.', $line, $this->parser->getStream()->getSourceContext());
                 }
 
                 if (!$this->parser->getParent() && !$this->parser->hasTraits()) {
                     throw new SyntaxError('Calling "parent" on a template that does not extend nor "use" another template is forbidden.', $line, $this->parser->getStream()->getSourceContext());
                 }
 
                 return new ParentExpression($this->parser->peekBlockStack(), $line);
             case 'block':
                 $args = $this->parseArguments();
                 if (\count($args) < 1) {
                     throw new SyntaxError('The "block" function takes one argument (the block name).', $line, $this->parser->getStream()->getSourceContext());
                 }
 
                 return new BlockReferenceExpression($args->getNode(0), \count($args) > 1 ? $args->getNode(1) : null, $line);
             case 'attribute':
                 $args = $this->parseArguments();
                 if (\count($args) < 2) {
                     throw new SyntaxError('The "attribute" function takes at least two arguments (the variable and the attributes).', $line, $this->parser->getStream()->getSourceContext());
                 }
 
                 return new GetAttrExpression($args->getNode(0), $args->getNode(1), \count($args) > 2 ? $args->getNode(2) : null, Template::ANY_CALL, $line);
             default:
                 if (null !== $alias = $this->parser->getImportedSymbol('function', $name)) {
                     $arguments = new ArrayExpression([], $line);
                     foreach ($this->parseArguments() as $n) {
                         $arguments->addElement($n);
                     }
 
                     $node = new MethodCallExpression($alias['node'], $alias['name'], $arguments, $line);
                     $node->setAttribute('safe', true);
 
                     return $node;
                 }
 
                 $args = $this->parseArguments(true);
                 $class = $this->getFunctionNodeClass($name, $line);
 
                 return new $class($name, $args, $line);
         }
     }
 
     public function parseSubscriptExpression($node)
     {
         $stream = $this->parser->getStream();
         $token = $stream->next();
         $lineno = $token->getLine();
         $arguments = new ArrayExpression([], $lineno);
         $type = Template::ANY_CALL;
         if ('.' == $token->getValue()) {
             $token = $stream->next();
             if (
                 Token::NAME_TYPE == $token->getType()
                 ||
                 Token::NUMBER_TYPE == $token->getType()
                 ||
                 (Token::OPERATOR_TYPE == $token->getType() && preg_match(Lexer::REGEX_NAME, $token->getValue()))
             ) {
                 $arg = new ConstantExpression($token->getValue(), $lineno);
 
                 if ($stream->test(Token::PUNCTUATION_TYPE, '(')) {
                     $type = Template::METHOD_CALL;
                     foreach ($this->parseArguments() as $n) {
                         $arguments->addElement($n);
                     }
                 }
             } else {
                 throw new SyntaxError('Expected name or number.', $lineno, $stream->getSourceContext());
             }
 
             if ($node instanceof NameExpression && null !== $this->parser->getImportedSymbol('template', $node->getAttribute('name'))) {
                 if (!$arg instanceof ConstantExpression) {
                     throw new SyntaxError(sprintf('Dynamic macro names are not supported (called on "%s").', $node->getAttribute('name')), $token->getLine(), $stream->getSourceContext());
                 }
 
                 $name = $arg->getAttribute('value');
 
                 if ($this->parser->isReservedMacroName($name)) {
                     throw new SyntaxError(sprintf('"%s" cannot be called as macro as it is a reserved keyword.', $name), $token->getLine(), $stream->getSourceContext());
                 }
 
                 $node = new MethodCallExpression($node, 'get'.$name, $arguments, $lineno);
                 $node->setAttribute('safe', true);
 
                 return $node;
             }
         } else {
             $type = Template::ARRAY_CALL;
 
             // slice?
             $slice = false;
             if ($stream->test(Token::PUNCTUATION_TYPE, ':')) {
                 $slice = true;
                 $arg = new ConstantExpression(0, $token->getLine());
             } else {
                 $arg = $this->parseExpression();
             }
 
             if ($stream->nextIf(Token::PUNCTUATION_TYPE, ':')) {
                 $slice = true;
             }
 
             if ($slice) {
                 if ($stream->test(Token::PUNCTUATION_TYPE, ']')) {
                     $length = new ConstantExpression(null, $token->getLine());
                 } else {
                     $length = $this->parseExpression();
                 }
 
                 $class = $this->getFilterNodeClass('slice', $token->getLine());
                 $arguments = new Node([$arg, $length]);
                 $filter = new $class($node, new ConstantExpression('slice', $token->getLine()), $arguments, $token->getLine());
 
                 $stream->expect(Token::PUNCTUATION_TYPE, ']');
 
                 return $filter;
             }
 
             $stream->expect(Token::PUNCTUATION_TYPE, ']');
         }
 
         return new GetAttrExpression($node, $arg, $arguments, $type, $lineno);
     }
 
     public function parseFilterExpression($node)
     {
         $this->parser->getStream()->next();
 
         return $this->parseFilterExpressionRaw($node);
     }
 
     public function parseFilterExpressionRaw($node, $tag = null)
     {
         while (true) {
             $token = $this->parser->getStream()->expect(Token::NAME_TYPE);
 
             $name = new ConstantExpression($token->getValue(), $token->getLine());
             if (!$this->parser->getStream()->test(Token::PUNCTUATION_TYPE, '(')) {
                 $arguments = new Node();
             } else {
                 $arguments = $this->parseArguments(true);
             }
 
             $class = $this->getFilterNodeClass($name->getAttribute('value'), $token->getLine());
 
             $node = new $class($node, $name, $arguments, $token->getLine(), $tag);
 
             if (!$this->parser->getStream()->test(Token::PUNCTUATION_TYPE, '|')) {
                 break;
             }
 
             $this->parser->getStream()->next();
         }
 
         return $node;
     }
 
     /**
      * Parses arguments.
      *
      * @param bool $namedArguments Whether to allow named arguments or not
      * @param bool $definition     Whether we are parsing arguments for a function definition
      *
      * @return Node
      *
      * @throws SyntaxError
      */
     public function parseArguments($namedArguments = false, $definition = false)
     {
         $args = [];
         $stream = $this->parser->getStream();
 
         $stream->expect(Token::PUNCTUATION_TYPE, '(', 'A list of arguments must begin with an opening parenthesis');
         while (!$stream->test(Token::PUNCTUATION_TYPE, ')')) {
             if (!empty($args)) {
                 $stream->expect(Token::PUNCTUATION_TYPE, ',', 'Arguments must be separated by a comma');
             }
 
             if ($definition) {
                 $token = $stream->expect(Token::NAME_TYPE, null, 'An argument must be a name');
                 $value = new NameExpression($token->getValue(), $this->parser->getCurrentToken()->getLine());
             } else {
                 $value = $this->parseExpression();
             }
 
             $name = null;
             if ($namedArguments && $token = $stream->nextIf(Token::OPERATOR_TYPE, '=')) {
                 if (!$value instanceof NameExpression) {
                     throw new SyntaxError(sprintf('A parameter name must be a string, "%s" given.', \get_class($value)), $token->getLine(), $stream->getSourceContext());
                 }
                 $name = $value->getAttribute('name');
 
                 if ($definition) {
                     $value = $this->parsePrimaryExpression();
 
                     if (!$this->checkConstantExpression($value)) {
                         throw new SyntaxError(sprintf('A default value for an argument must be a constant (a boolean, a string, a number, or an array).'), $token->getLine(), $stream->getSourceContext());
                     }
                 } else {
                     $value = $this->parseExpression();
                 }
             }
 
             if ($definition) {
                 if (null === $name) {
                     $name = $value->getAttribute('name');
                     $value = new ConstantExpression(null, $this->parser->getCurrentToken()->getLine());
                 }
                 $args[$name] = $value;
             } else {
                 if (null === $name) {
                     $args[] = $value;
                 } else {
                     $args[$name] = $value;
                 }
             }
         }
         $stream->expect(Token::PUNCTUATION_TYPE, ')', 'A list of arguments must be closed by a parenthesis');
 
         return new Node($args);
     }
 
     public function parseAssignmentExpression()
     {
         $stream = $this->parser->getStream();
         $targets = [];
         while (true) {
             $token = $stream->expect(Token::NAME_TYPE, null, 'Only variables can be assigned to');
             $value = $token->getValue();
             if (\in_array(strtolower($value), ['true', 'false', 'none', 'null'])) {
                 throw new SyntaxError(sprintf('You cannot assign a value to "%s".', $value), $token->getLine(), $stream->getSourceContext());
             }
             $targets[] = new AssignNameExpression($value, $token->getLine());
 
             if (!$stream->nextIf(Token::PUNCTUATION_TYPE, ',')) {
                 break;
             }
         }
 
         return new Node($targets);
     }
 
     public function parseMultitargetExpression()
     {
         $targets = [];
         while (true) {
             $targets[] = $this->parseExpression();
             if (!$this->parser->getStream()->nextIf(Token::PUNCTUATION_TYPE, ',')) {
                 break;
             }
         }
 
         return new Node($targets);
     }
 
     private function parseNotTestExpression(\Twig_NodeInterface $node)
     {
         return new NotUnary($this->parseTestExpression($node), $this->parser->getCurrentToken()->getLine());
     }
 
     private function parseTestExpression(\Twig_NodeInterface $node)
     {
         $stream = $this->parser->getStream();
         list($name, $test) = $this->getTest($node->getTemplateLine());
 
         $class = $this->getTestNodeClass($test);
         $arguments = null;
         if ($stream->test(Token::PUNCTUATION_TYPE, '(')) {
             $arguments = $this->parser->getExpressionParser()->parseArguments(true);
         }
 
         return new $class($node, $name, $arguments, $this->parser->getCurrentToken()->getLine());
     }
 
     private function getTest($line)
     {
         $stream = $this->parser->getStream();
         $name = $stream->expect(Token::NAME_TYPE)->getValue();
 
         if ($test = $this->env->getTest($name)) {
             return [$name, $test];
         }
 
         if ($stream->test(Token::NAME_TYPE)) {
             // try 2-words tests
             $name = $name.' '.$this->parser->getCurrentToken()->getValue();
 
             if ($test = $this->env->getTest($name)) {
                 $stream->next();
 
                 return [$name, $test];
             }
         }
 
         $e = new SyntaxError(sprintf('Unknown "%s" test.', $name), $line, $stream->getSourceContext());
         $e->addSuggestions($name, array_keys($this->env->getTests()));
 
         throw $e;
     }
 
     private function getTestNodeClass($test)
     {
         if ($test instanceof TwigTest && $test->isDeprecated()) {
             $stream = $this->parser->getStream();
             $message = sprintf('Twig Test "%s" is deprecated', $test->getName());
             if (!\is_bool($test->getDeprecatedVersion())) {
                 $message .= sprintf(' since version %s', $test->getDeprecatedVersion());
             }
             if ($test->getAlternative()) {
                 $message .= sprintf('. Use "%s" instead', $test->getAlternative());
             }
             $src = $stream->getSourceContext();
             $message .= sprintf(' in %s at line %d.', $src->getPath() ? $src->getPath() : $src->getName(), $stream->getCurrent()->getLine());
 
             @trigger_error($message, E_USER_DEPRECATED);
         }
 
         if ($test instanceof TwigTest) {
             return $test->getNodeClass();
         }
 
         return $test instanceof \Twig_Test_Node ? $test->getClass() : 'Twig\Node\Expression\TestExpression';
     }
 
     protected function getFunctionNodeClass($name, $line)
     {
         if (false === $function = $this->env->getFunction($name)) {
             $e = new SyntaxError(sprintf('Unknown "%s" function.', $name), $line, $this->parser->getStream()->getSourceContext());
             $e->addSuggestions($name, array_keys($this->env->getFunctions()));
 
             throw $e;
         }
 
         if ($function instanceof TwigFunction && $function->isDeprecated()) {
             $message = sprintf('Twig Function "%s" is deprecated', $function->getName());
             if (!\is_bool($function->getDeprecatedVersion())) {
                 $message .= sprintf(' since version %s', $function->getDeprecatedVersion());
             }
             if ($function->getAlternative()) {
                 $message .= sprintf('. Use "%s" instead', $function->getAlternative());
             }
             $src = $this->parser->getStream()->getSourceContext();
             $message .= sprintf(' in %s at line %d.', $src->getPath() ? $src->getPath() : $src->getName(), $line);
 
             @trigger_error($message, E_USER_DEPRECATED);
         }
 
         if ($function instanceof TwigFunction) {
             return $function->getNodeClass();
         }
 
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         return $function instanceof \Twig_Function_Node ? $function->getClass() : 'Twig\Node\Expression\FunctionExpression';
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     }
 
     protected function getFilterNodeClass($name, $line)
     {
         if (false === $filter = $this->env->getFilter($name)) {
             $e = new SyntaxError(sprintf('Unknown "%s" filter.', $name), $line, $this->parser->getStream()->getSourceContext());
             $e->addSuggestions($name, array_keys($this->env->getFilters()));
 
             throw $e;
         }
 
         if ($filter instanceof TwigFilter && $filter->isDeprecated()) {
             $message = sprintf('Twig Filter "%s" is deprecated', $filter->getName());
             if (!\is_bool($filter->getDeprecatedVersion())) {
                 $message .= sprintf(' since version %s', $filter->getDeprecatedVersion());
             }
             if ($filter->getAlternative()) {
                 $message .= sprintf('. Use "%s" instead', $filter->getAlternative());
             }
             $src = $this->parser->getStream()->getSourceContext();
             $message .= sprintf(' in %s at line %d.', $src->getPath() ? $src->getPath() : $src->getName(), $line);
 
             @trigger_error($message, E_USER_DEPRECATED);
         }
 
         if ($filter instanceof TwigFilter) {
             return $filter->getNodeClass();
         }
 
         return $filter instanceof \Twig_Filter_Node ? $filter->getClass() : 'Twig\Node\Expression\FilterExpression';
     }
 
     // checks that the node only contains "constant" elements
     protected function checkConstantExpression(\Twig_NodeInterface $node)
     {
         if (!($node instanceof ConstantExpression || $node instanceof ArrayExpression
             || $node instanceof NegUnary || $node instanceof PosUnary
         )) {
             return false;
         }
 
         foreach ($node as $n) {
             if (!$this->checkConstantExpression($n)) {
                 return false;
             }
         }
 
         return true;
5420a5e3
     }
 }
baa70287
 
 class_alias('Twig\ExpressionParser', 'Twig_ExpressionParser');