From: Fabien Potencier <fabien.potencier@gmail.com>
Date: Fri, 26 Nov 2010 09:35:49 +0000 (+0100)
Subject: rewrote expression parser with a new algorithm to limit the depth of nested calls
X-Git-Url: http://git.silmor.de/gitweb/?a=commitdiff_plain;h=9d8583efcc236f7c8bc357ef0c122c9246ef5115;p=konrad%2Ftwig.git

rewrote expression parser with a new algorithm to limit the depth of nested calls

This change has no impact for the end user, but many internal benefits:

* less nested calls (was the primary reason for the change as xdebug limits the depth of nested calls);
* less code;
* code is much cleaner (I have removed all the parsing "hacks");
* faster;
* more flexible (we will now be able to expose an API to add new operators);
* easier to maintain.
---

diff --git a/CHANGELOG b/CHANGELOG
index f9f56fa..24f70d6 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -11,8 +11,11 @@ Backward incompatibilities:
  * the urlencode filter had been renamed to url_encode
  * the include tag now merges the passed variables with the current context by default
    (the old behavior is still possible by adding the "only" keyword)
- * Moved Exceptions to Twig_Error_* (Twig_SyntaxError/Twig_RuntimeError are now Twig_Error_Syntax/Twig_Error_Runtime)
+ * moved Exceptions to Twig_Error_* (Twig_SyntaxError/Twig_RuntimeError are now Twig_Error_Syntax/Twig_Error_Runtime)
+ * removed support for {{ 1 < i < 3 }} (use {{ i > 1 and i < 3 }} instead)
 
+ * added the ** (power) operator
+ * changed the algorithm used for parsing expressions
  * added the spaceless tag
  * removed trim_blocks option
  * added support for is*() methods for attributes (foo.bar now looks for foo->getBar() or foo->isBar())
diff --git a/doc/02-Twig-for-Template-Designers.markdown b/doc/02-Twig-for-Template-Designers.markdown
index 37c2359..5602c8a 100644
--- a/doc/02-Twig-for-Template-Designers.markdown
+++ b/doc/02-Twig-for-Template-Designers.markdown
@@ -1006,13 +1006,6 @@ combine multiple expressions:
 The following comparison operators are supported in any expression: `==`,
 `!=`, `<`, `>`, `>=`, and `<=`.
 
->**TIP**
->Besides PHP classic comparison operators, Twig also supports a shortcut
->notation when you want to test a value in a range:
->
->     [twig]
->     {% if 1 < foo < 4 %}foo is between 1 and 4{% endif %}
-
 ### Other Operators
 
 The following operators are very useful but don't fit into any of the other
diff --git a/lib/Twig/ExpressionParser.php b/lib/Twig/ExpressionParser.php
index e5d530a..80f8d1d 100644
--- a/lib/Twig/ExpressionParser.php
+++ b/lib/Twig/ExpressionParser.php
@@ -13,240 +13,132 @@
 /**
  * Parses expressions.
  *
+ * This parser implements a "Precedence climbing" algorithm.
+ *
+ * @see http://www.engr.mun.ca/~theo/Misc/exp_parsing.htm
+ * @see http://en.wikipedia.org/wiki/Operator-precedence_parser
+ *
  * @package    twig
  * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
  */
 class Twig_ExpressionParser
 {
+    const OPERATOR_LEFT = 1;
+    const OPERATOR_RIGHT = 2;
+
     protected $parser;
+    protected $unaryOperators;
+    protected $binaryOperators;
 
     public function __construct(Twig_Parser $parser)
     {
         $this->parser = $parser;
+        $this->unaryOperators = $this->getUnaryOperators();
+        $this->binaryOperators = $this->getBinaryOperators();
     }
 
-    public function parseExpression()
+    public function getUnaryOperators()
     {
-        return $this->parseConditionalExpression();
+        return array(
+            'not' => array('precedence' => 50, 'class' => 'Twig_Node_Expression_Unary_Not'),
+            '-'   => array('precedence' => 50, 'class' => 'Twig_Node_Expression_Unary_Neg'),
+            '+'   => array('precedence' => 50, 'class' => 'Twig_Node_Expression_Unary_Pos'),
+        );
     }
 
-    public function parseConditionalExpression()
+    public function getBinaryOperators()
     {
-        $lineno = $this->parser->getCurrentToken()->getLine();
-        $expr1 = $this->parseOrExpression();
-        while ($this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, '?')) {
-            $this->parser->getStream()->next();
-            $expr2 = $this->parseOrExpression();
-            $this->parser->getStream()->expect(Twig_Token::OPERATOR_TYPE, ':');
-            $expr3 = $this->parseConditionalExpression();
-            $expr1 = new Twig_Node_Expression_Conditional($expr1, $expr2, $expr3, $lineno);
-            $lineno = $this->parser->getCurrentToken()->getLine();
-        }
-
-        return $expr1;
-    }
-
-    public function parseOrExpression()
-    {
-        $lineno = $this->parser->getCurrentToken()->getLine();
-        $left = $this->parseAndExpression();
-        while ($this->parser->getStream()->test('or')) {
-            $this->parser->getStream()->next();
-            $right = $this->parseAndExpression();
-            $left = new Twig_Node_Expression_Binary_Or($left, $right, $lineno);
-            $lineno = $this->parser->getCurrentToken()->getLine();
-        }
-
-        return $left;
+        return array(
+            'or'     => array('precedence' => 10, 'class' => 'Twig_Node_Expression_Binary_Or', 'associativity' => self::OPERATOR_LEFT),
+            'and'    => array('precedence' => 15, 'class' => 'Twig_Node_Expression_Binary_And', 'associativity' => self::OPERATOR_LEFT),
+            '=='     => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_Equal', 'associativity' => self::OPERATOR_LEFT),
+            '!='     => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_NotEqual', 'associativity' => self::OPERATOR_LEFT),
+            '<'      => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_Less', 'associativity' => self::OPERATOR_LEFT),
+            '>'      => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_Greater', 'associativity' => self::OPERATOR_LEFT),
+            '>='     => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_GreaterEqual', 'associativity' => self::OPERATOR_LEFT),
+            '<='     => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_LessEqual', 'associativity' => self::OPERATOR_LEFT),
+            'not in' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_NotIn', 'associativity' => self::OPERATOR_LEFT),
+            'in'     => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_In', 'associativity' => self::OPERATOR_LEFT),
+            '+'      => array('precedence' => 30, 'class' => 'Twig_Node_Expression_Binary_Add', 'associativity' => self::OPERATOR_LEFT),
+            '-'      => array('precedence' => 30, 'class' => 'Twig_Node_Expression_Binary_Sub', 'associativity' => self::OPERATOR_LEFT),
+            '~'      => array('precedence' => 40, 'class' => 'Twig_Node_Expression_Binary_Concat', 'associativity' => self::OPERATOR_LEFT),
+            '*'      => array('precedence' => 60, 'class' => 'Twig_Node_Expression_Binary_Mul', 'associativity' => self::OPERATOR_LEFT),
+            '/'      => array('precedence' => 60, 'class' => 'Twig_Node_Expression_Binary_Div', 'associativity' => self::OPERATOR_LEFT),
+            '//'     => array('precedence' => 60, 'class' => 'Twig_Node_Expression_Binary_FloorDiv', 'associativity' => self::OPERATOR_LEFT),
+            '%'      => array('precedence' => 60, 'class' => 'Twig_Node_Expression_Binary_Mod', 'associativity' => self::OPERATOR_LEFT),
+            'is'     => array('precedence' => 100, 'callable' => array($this, 'parseTestExpression'), 'associativity' => self::OPERATOR_LEFT),
+            'is not' => array('precedence' => 100, 'callable' => array($this, 'parseNotTestExpression'), 'associativity' => self::OPERATOR_LEFT),
+            '..'     => array('precedence' => 110, 'class' => 'Twig_Node_Expression_Binary_Range', 'associativity' => self::OPERATOR_LEFT),
+            '**'     => array('precedence' => 200, 'class' => 'Twig_Node_Expression_Binary_Power', 'associativity' => self::OPERATOR_RIGHT),
+        );
     }
 
-    public function parseAndExpression()
+    public function parseExpression($precedence = 0)
     {
-        $lineno = $this->parser->getCurrentToken()->getLine();
-        $left = $this->parseCompareExpression();
-        while ($this->parser->getStream()->test('and')) {
+        $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();
-            $right = $this->parseCompareExpression();
-            $left = new Twig_Node_Expression_Binary_And($left, $right, $lineno);
-            $lineno = $this->parser->getCurrentToken()->getLine();
-        }
 
-        return $left;
-    }
-
-    public function parseCompareExpression()
-    {
-        static $operators = array('==', '!=', '<', '>', '>=', '<=');
-        $lineno = $this->parser->getCurrentToken()->getLine();
-        $expr = $this->parseAddExpression();
-        $ops = array();
-        $negated = false;
-        while (
-            $this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, $operators)
-            ||
-            ($this->parser->getStream()->test(Twig_Token::NAME_TYPE, 'not') && $this->parser->getStream()->look()->test(Twig_Token::NAME_TYPE, 'in'))
-            ||
-            $this->parser->getStream()->test(Twig_Token::NAME_TYPE, 'in')
-        ) {
-            $this->parser->getStream()->rewind();
-            if ($this->parser->getStream()->test(Twig_Token::NAME_TYPE, 'not')) {
-                $negated = true;
-                $this->parser->getStream()->next();
+            if (isset($op['callable'])) {
+                $expr = call_user_func($op['callable'], $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());
             }
-            $ops[] = new Twig_Node_Expression_Constant($this->parser->getStream()->next()->getValue(), $lineno);
-            $ops[] = $this->parseAddExpression();
-        }
 
-        if (empty($ops)) {
-            return $expr;
-        }
-
-        $node = new Twig_Node_Expression_Compare($expr, new Twig_Node($ops), $lineno);
-
-        if ($negated) {
-            $node = new Twig_Node_Expression_Unary_Not($node, $lineno);
-        }
-
-        return $node;
-    }
-
-    public function parseAddExpression()
-    {
-        $lineno = $this->parser->getCurrentToken()->getLine();
-        $left = $this->parseSubExpression();
-        while ($this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, '+')) {
-            $this->parser->getStream()->next();
-            $right = $this->parseSubExpression();
-            $left = new Twig_Node_Expression_Binary_Add($left, $right, $lineno);
-            $lineno = $this->parser->getCurrentToken()->getLine();
-        }
-
-        return $left;
-    }
-
-    public function parseSubExpression()
-    {
-        $lineno = $this->parser->getCurrentToken()->getLine();
-        $left = $this->parseConcatExpression();
-        while ($this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, '-')) {
-            $this->parser->getStream()->next();
-            $right = $this->parseConcatExpression();
-            $left = new Twig_Node_Expression_Binary_Sub($left, $right, $lineno);
-            $lineno = $this->parser->getCurrentToken()->getLine();
+            $token = $this->parser->getCurrentToken();
         }
 
-        return $left;
+        return $this->parseConditionalExpression($expr);
     }
 
-    public function parseConcatExpression()
+    protected function getPrimary()
     {
-        $lineno = $this->parser->getCurrentToken()->getLine();
-        $left = $this->parseMulExpression();
-        while ($this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, '~')) {
-            $this->parser->getStream()->next();
-            $right = $this->parseMulExpression();
-            $left = new Twig_Node_Expression_Binary_Concat($left, $right, $lineno);
-            $lineno = $this->parser->getCurrentToken()->getLine();
-        }
-
-        return $left;
-    }
+        $token = $this->parser->getCurrentToken();
 
-    public function parseMulExpression()
-    {
-        $lineno = $this->parser->getCurrentToken()->getLine();
-        $left = $this->parseDivExpression();
-        while ($this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, '*')) {
+        if ($this->isUnary($token)) {
+            $operator = $this->unaryOperators[$token->getValue()];
             $this->parser->getStream()->next();
-            $right = $this->parseDivExpression();
-            $left = new Twig_Node_Expression_Binary_Mul($left, $right, $lineno);
-            $lineno = $this->parser->getCurrentToken()->getLine();
-        }
-
-        return $left;
-    }
+            $expr = $this->parseExpression($operator['precedence']);
+            $class = $operator['class'];
 
-    public function parseDivExpression()
-    {
-        $lineno = $this->parser->getCurrentToken()->getLine();
-        $left = $this->parseFloorDivExpression();
-        while ($this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, '/')) {
+            return new $class($expr, $token->getLine());
+        } elseif ($token->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
             $this->parser->getStream()->next();
-            $right = $this->parseModExpression();
-            $left = new Twig_Node_Expression_Binary_Div($left, $right, $lineno);
-            $lineno = $this->parser->getCurrentToken()->getLine();
-        }
+            $expr = $this->parseExpression();
+            $this->parser->getStream()->expect(Twig_Token::PUNCTUATION_TYPE, ')');
 
-        return $left;
-    }
-
-    public function parseFloorDivExpression()
-    {
-        $lineno = $this->parser->getCurrentToken()->getLine();
-        $left = $this->parseModExpression();
-        while ($this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, '//')) {
-            $this->parser->getStream()->next();
-            $right = $this->parseModExpression();
-            $left = new Twig_Node_Expression_Binary_FloorDiv($left, $right, $lineno);
-            $lineno = $this->parser->getCurrentToken()->getLine();
+            return $expr;
         }
 
-        return $left;
+        return $this->parsePrimaryExpression();
     }
 
-    public function parseModExpression()
+    protected function parseConditionalExpression($expr)
     {
-        $lineno = $this->parser->getCurrentToken()->getLine();
-        $left = $this->parseUnaryExpression();
-        while ($this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, '%')) {
+        while ($this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '?')) {
             $this->parser->getStream()->next();
-            $right = $this->parseUnaryExpression();
-            $left = new Twig_Node_Expression_Binary_Mod($left, $right, $lineno);
-            $lineno = $this->parser->getCurrentToken()->getLine();
-        }
+            $expr2 = $this->parseExpression();
+            $this->parser->getStream()->expect(Twig_Token::PUNCTUATION_TYPE, ':');
+            $expr3 = $this->parseExpression();
 
-        return $left;
-    }
-
-    public function parseUnaryExpression()
-    {
-        if ($this->parser->getStream()->test('not')) {
-            return $this->parseNotExpression();
-        }
-        if ($this->parser->getCurrentToken()->getType() == Twig_Token::OPERATOR_TYPE) {
-            switch ($this->parser->getCurrentToken()->getValue()) {
-                case '-':
-                    return $this->parseNegExpression();
-                case '+':
-                    return $this->parsePosExpression();
-            }
+            $expr = new Twig_Node_Expression_Conditional($expr, $expr2, $expr3, $this->parser->getCurrentToken()->getLine());
         }
 
-        return $this->parsePrimaryExpression();
+        return $expr;
     }
 
-    public function parseNotExpression()
+    protected function isUnary(Twig_Token $token)
     {
-        $token = $this->parser->getStream()->next();
-        $node = $this->parseUnaryExpression();
-
-        return new Twig_Node_Expression_Unary_Not($node, $token->getLine());
+        return $this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE) && isset($this->unaryOperators[$token->getValue()]);
     }
 
-    public function parseNegExpression()
+    protected function isBinary(Twig_Token $token)
     {
-        $token = $this->parser->getStream()->next();
-        $node = $this->parseUnaryExpression();
-
-        return new Twig_Node_Expression_Unary_Neg($node, $token->getLine());
-    }
-
-    public function parsePosExpression()
-    {
-        $token = $this->parser->getStream()->next();
-        $node = $this->parseUnaryExpression();
-
-        return new Twig_Node_Expression_Unary_Pos($node, $token->getLine());
+        return $this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE) && isset($this->binaryOperators[$token->getValue()]);
     }
 
     public function parsePrimaryExpression($assignment = false)
@@ -281,12 +173,8 @@ class Twig_ExpressionParser
                 break;
 
             default:
-                if ($token->test(Twig_Token::OPERATOR_TYPE, '[')) {
+                if ($token->test(Twig_Token::PUNCTUATION_TYPE, '[')) {
                     $node = $this->parseArrayExpression();
-                } elseif ($token->test(Twig_Token::OPERATOR_TYPE, '(')) {
-                    $this->parser->getStream()->next();
-                    $node = $this->parseExpression();
-                    $this->parser->getStream()->expect(Twig_Token::OPERATOR_TYPE, ')');
                 } else {
                     throw new Twig_Error_Syntax(sprintf('Unexpected token "%s" of value "%s"', Twig_Token::getTypeAsString($token->getType()), $token->getValue()), $token->getLine());
                 }
@@ -302,15 +190,15 @@ class Twig_ExpressionParser
     public function parseArrayExpression()
     {
         $stream = $this->parser->getStream();
-        $stream->expect(Twig_Token::OPERATOR_TYPE, '[');
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, '[');
         $elements = array();
-        while (!$stream->test(Twig_Token::OPERATOR_TYPE, ']')) {
+        while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
             if (!empty($elements)) {
-                $stream->expect(Twig_Token::OPERATOR_TYPE, ',');
+                $stream->expect(Twig_Token::PUNCTUATION_TYPE, ',');
 
                 // trailing ,?
-                if ($stream->test(Twig_Token::OPERATOR_TYPE, ']')) {
-                    $stream->expect(Twig_Token::OPERATOR_TYPE, ']');
+                if ($stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
+                    $stream->expect(Twig_Token::PUNCTUATION_TYPE, ']');
 
                     return new Twig_Node_Expression_Array($elements, $this->parser->getCurrentToken()->getLine());
                 }
@@ -323,7 +211,7 @@ class Twig_ExpressionParser
                 $stream->test(Twig_Token::NUMBER_TYPE)
             )
             {
-                if ($stream->look()->test(Twig_Token::OPERATOR_TYPE, ':')) {
+                if ($stream->look()->test(Twig_Token::PUNCTUATION_TYPE, ':')) {
                     // hash
                     $key = $stream->next()->getValue();
                     $stream->next();
@@ -337,7 +225,7 @@ class Twig_ExpressionParser
 
             $elements[] = $this->parseExpression();
         }
-        $stream->expect(Twig_Token::OPERATOR_TYPE, ']');
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, ']');
 
         return new Twig_Node_Expression_Array($elements, $this->parser->getCurrentToken()->getLine());
     }
@@ -346,19 +234,14 @@ class Twig_ExpressionParser
     {
         while (1) {
             $token = $this->parser->getCurrentToken();
-            if ($token->getType() == Twig_Token::OPERATOR_TYPE) {
-                if ('..' == $token->getValue()) {
-                    $node = $this->parseRangeExpression($node);
-                } elseif ('.' == $token->getValue() || '[' == $token->getValue()) {
+            if ($token->getType() == Twig_Token::PUNCTUATION_TYPE) {
+                if ('.' == $token->getValue() || '[' == $token->getValue()) {
                     $node = $this->parseSubscriptExpression($node);
                 } elseif ('|' == $token->getValue()) {
                     $node = $this->parseFilterExpression($node);
                 } else {
                     break;
                 }
-            } elseif ($token->getType() == Twig_Token::NAME_TYPE && 'is' == $token->getValue()) {
-                $node = $this->parseTestExpression($node);
-                break;
             } else {
                 break;
             }
@@ -367,44 +250,21 @@ class Twig_ExpressionParser
         return $node;
     }
 
+    public function parseNotTestExpression($node)
+    {
+        return new Twig_Node_Expression_Unary_Not($this->parseTestExpression($node), $this->parser->getCurrentToken()->getLine());
+    }
+
     public function parseTestExpression($node)
     {
         $stream = $this->parser->getStream();
-        $token = $stream->next();
-        $lineno = $token->getLine();
-
-        $negated = false;
-        if ($stream->test('not')) {
-            $stream->next();
-            $negated = true;
-        }
-
         $name = $stream->expect(Twig_Token::NAME_TYPE);
-
         $arguments = null;
-        if ($stream->test(Twig_Token::OPERATOR_TYPE, '(')) {
+        if ($stream->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
             $arguments = $this->parseArguments($node);
         }
-        $test = new Twig_Node_Expression_Test($node, $name->getValue(), $arguments, $lineno);
-
-        if ($negated) {
-            $test = new Twig_Node_Expression_Unary_Not($test, $lineno);
-        }
-
-        return $test;
-    }
-
-    public function parseRangeExpression($node)
-    {
-        $token = $this->parser->getStream()->next();
-        $lineno = $token->getLine();
 
-        $end = $this->parseExpression();
-
-        $name = new Twig_Node_Expression_Constant('range', $lineno);
-        $arguments = new Twig_Node(array($end));
-
-        return new Twig_Node_Expression_Filter($node, $name, $arguments, $lineno);
+        return new Twig_Node_Expression_Test($node, $name->getValue(), $arguments, $this->parser->getCurrentToken()->getLine());
     }
 
     public function parseSubscriptExpression($node)
@@ -418,7 +278,7 @@ class Twig_ExpressionParser
             if ($token->getType() == Twig_Token::NAME_TYPE || $token->getType() == Twig_Token::NUMBER_TYPE) {
                 $arg = new Twig_Node_Expression_Constant($token->getValue(), $lineno);
 
-                if ($this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, '(')) {
+                if ($this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
                     $type = Twig_Node_Expression_GetAttr::TYPE_METHOD;
                     $arguments = $this->parseArguments();
                 } else {
@@ -431,7 +291,7 @@ class Twig_ExpressionParser
             $type = Twig_Node_Expression_GetAttr::TYPE_ARRAY;
 
             $arg = $this->parseExpression();
-            $this->parser->getStream()->expect(Twig_Token::OPERATOR_TYPE, ']');
+            $this->parser->getStream()->expect(Twig_Token::PUNCTUATION_TYPE, ']');
         }
 
         return new Twig_Node_Expression_GetAttr($node, $arg, $arguments, $type, $lineno);
@@ -452,7 +312,7 @@ class Twig_ExpressionParser
             $token = $this->parser->getStream()->expect(Twig_Token::NAME_TYPE);
 
             $name = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
-            if (!$this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, '(')) {
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
                 $arguments = new Twig_Node();
             } else {
                 $arguments = $this->parseArguments();
@@ -460,7 +320,7 @@ class Twig_ExpressionParser
 
             $node = new Twig_Node_Expression_Filter($node, $name, $arguments, $token->getLine(), $tag);
 
-            if (!$this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, '|')) {
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '|')) {
                 break;
             }
 
@@ -473,16 +333,16 @@ class Twig_ExpressionParser
     public function parseArguments()
     {
         $parser = $this->parser->getStream();
-        $parser->expect(Twig_Token::OPERATOR_TYPE, '(');
+        $parser->expect(Twig_Token::PUNCTUATION_TYPE, '(');
 
         $args = array();
-        while (!$parser->test(Twig_Token::OPERATOR_TYPE, ')')) {
+        while (!$parser->test(Twig_Token::PUNCTUATION_TYPE, ')')) {
             if (!empty($args)) {
-                $parser->expect(Twig_Token::OPERATOR_TYPE, ',');
+                $parser->expect(Twig_Token::PUNCTUATION_TYPE, ',');
             }
             $args[] = $this->parseExpression();
         }
-        $parser->expect(Twig_Token::OPERATOR_TYPE, ')');
+        $parser->expect(Twig_Token::PUNCTUATION_TYPE, ')');
 
         return new Twig_Node($args);
     }
@@ -493,17 +353,16 @@ class Twig_ExpressionParser
         $targets = array();
         while (true) {
             if (!empty($targets)) {
-                $this->parser->getStream()->expect(Twig_Token::OPERATOR_TYPE, ',');
+                $this->parser->getStream()->expect(Twig_Token::PUNCTUATION_TYPE, ',');
             }
-            if ($this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, ')') ||
+            if ($this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, ')') ||
                     $this->parser->getStream()->test(Twig_Token::VAR_END_TYPE) ||
-                    $this->parser->getStream()->test(Twig_Token::BLOCK_END_TYPE) ||
-                    $this->parser->getStream()->test('in'))
+                    $this->parser->getStream()->test(Twig_Token::BLOCK_END_TYPE))
             {
                 break;
             }
             $targets[] = $this->parsePrimaryExpression(true);
-            if (!$this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, ',')) {
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, ',')) {
                 break;
             }
         }
@@ -518,16 +377,16 @@ class Twig_ExpressionParser
         $is_multitarget = false;
         while (true) {
             if (!empty($targets)) {
-                $this->parser->getStream()->expect(Twig_Token::OPERATOR_TYPE, ',');
+                $this->parser->getStream()->expect(Twig_Token::PUNCTUATION_TYPE, ',');
             }
-            if ($this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, ')') ||
+            if ($this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, ')') ||
                     $this->parser->getStream()->test(Twig_Token::VAR_END_TYPE) ||
                     $this->parser->getStream()->test(Twig_Token::BLOCK_END_TYPE))
             {
                 break;
             }
             $targets[] = $this->parseExpression();
-            if (!$this->parser->getStream()->test(Twig_Token::OPERATOR_TYPE, ',')) {
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, ',')) {
                 break;
             }
             $is_multitarget = true;
diff --git a/lib/Twig/Extension/Core.php b/lib/Twig/Extension/Core.php
index 4c81fd5..e19fff5 100644
--- a/lib/Twig/Extension/Core.php
+++ b/lib/Twig/Extension/Core.php
@@ -63,7 +63,6 @@ class Twig_Extension_Core extends Twig_Extension
             'reverse' => new Twig_Filter_Function('twig_reverse_filter'),
             'length'  => new Twig_Filter_Function('twig_length_filter', array('needs_environment' => true)),
             'sort'    => new Twig_Filter_Function('twig_sort_filter'),
-            'in'      => new Twig_Filter_Function('twig_in_filter'),
             'range'   => new Twig_Filter_Function('twig_range_filter'),
             'cycle'   => new Twig_Filter_Function('twig_cycle_filter'),
 
diff --git a/lib/Twig/Lexer.php b/lib/Twig/Lexer.php
index 4dd18b5..5a62cbc 100644
--- a/lib/Twig/Lexer.php
+++ b/lib/Twig/Lexer.php
@@ -27,15 +27,19 @@ class Twig_Lexer implements Twig_LexerInterface
     protected $filename;
     protected $env;
     protected $options;
+    protected $operatorRegex;
+
+    // All unary and binary operators defined in Twig_ExpressionParser plus the = sign
+    protected $operators = array('=', 'not', 'or', 'and', '==', '!=', '<', '>', '>=', '<=', 'not in', 'in', '+', '-', '~', '*', '/', '//', '%', 'is', 'is not', '..', '**');
 
     const POSITION_DATA  = 0;
     const POSITION_BLOCK = 1;
     const POSITION_VAR   = 2;
 
-    const REGEX_NAME     = '/[A-Za-z_][A-Za-z0-9_]*/A';
-    const REGEX_NUMBER   = '/[0-9]+(?:\.[0-9]+)?/A';
-    const REGEX_STRING   = '/(?:"([^"\\\\]*(?:\\\\.[^"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\')/Asm';
-    const REGEX_OPERATOR = '/<=? | >=? | [!=]= | = | \/\/ | \.\. | [(){}.,%*\/+~|-] | \[ | \] | \? | \:/Ax';
+    const REGEX_NAME        = '/[A-Za-z_][A-Za-z0-9_]*/A';
+    const REGEX_NUMBER      = '/[0-9]+(?:\.[0-9]+)?/A';
+    const REGEX_STRING      = '/(?:"([^"\\\\]*(?:\\\\.[^"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\')/Asm';
+    const REGEX_PUNCTUATION = '/[\[\](){}?:.,|]/A';
 
     public function __construct(Twig_Environment $env = null, array $options = array())
     {
@@ -48,6 +52,13 @@ class Twig_Lexer implements Twig_LexerInterface
             'tag_block'    => array('{%', '%}'),
             'tag_variable' => array('{{', '}}'),
         ), $options);
+
+        $this->operatorRegex = $this->getOperatorRegex();
+    }
+
+    public function sortByLength($a, $b)
+    {
+        return strlen($a) > strlen($b) ? -1 : 1;
     }
 
     /**
@@ -270,10 +281,10 @@ class Twig_Lexer implements Twig_LexerInterface
         }
 
         // first parse operators
-        if (preg_match(self::REGEX_OPERATOR, $this->code, $match, null, $this->cursor)) {
-            $this->moveCursor($match[0]);
+        if (preg_match($this->operatorRegex, $this->code, $match, null, $this->cursor)) {
+            $this->moveCursor(trim($match[0], ' ()'));
 
-            return new Twig_Token(Twig_Token::OPERATOR_TYPE, $match[0], $this->lineno);
+            return new Twig_Token(Twig_Token::OPERATOR_TYPE, trim($match[0], ' ()'), $this->lineno);
         }
         // now names
         else if (preg_match(self::REGEX_NAME, $this->code, $match, null, $this->cursor)) {
@@ -291,6 +302,13 @@ class Twig_Lexer implements Twig_LexerInterface
 
             return new Twig_Token(Twig_Token::NUMBER_TYPE, $value, $this->lineno);
         }
+        // punctuation
+        else if (preg_match(self::REGEX_PUNCTUATION, $this->code, $match, null, $this->cursor)) {
+            $this->moveCursor($match[0]);
+            $this->moveLineNo($match[0]);
+
+            return new Twig_Token(Twig_Token::PUNCTUATION_TYPE, $match[0], $this->lineno);
+        }
         // and finally strings
         else if (preg_match(self::REGEX_STRING, $this->code, $match, null, $this->cursor)) {
             $this->moveCursor($match[0]);
@@ -314,4 +332,21 @@ class Twig_Lexer implements Twig_LexerInterface
         $this->cursor += strlen($text);
     }
 
+    protected function getOperatorRegex()
+    {
+        usort($this->operators, array($this, 'sortByLength'));
+        $operators = array();
+        foreach ($this->operators as $operator) {
+            $last = ord(substr($operator, -1));
+            // an operator that ends with a character must be followed by
+            // a whitespace or a parenthese
+            if (($last >= 65 && $last <= 90) || ($last >= 97 && $last <= 122)) {
+                $operators[] = preg_quote($operator, '/').'(?:[ \(\)])';
+            } else {
+                $operators[] = preg_quote($operator, '/');
+            }
+        }
+
+        return '/'.implode('|', $operators).'/A';
+    }
 }
diff --git a/lib/Twig/Node/Expression/Binary/Equal.php b/lib/Twig/Node/Expression/Binary/Equal.php
new file mode 100644
index 0000000..d28140e
--- /dev/null
+++ b/lib/Twig/Node/Expression/Binary/Equal.php
@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Equal extends Twig_Node_Expression_Binary
+{
+    public function operator($compiler)
+    {
+        return $compiler->raw('==');
+    }
+}
diff --git a/lib/Twig/Node/Expression/Binary/Greater.php b/lib/Twig/Node/Expression/Binary/Greater.php
new file mode 100644
index 0000000..3cc8e1c
--- /dev/null
+++ b/lib/Twig/Node/Expression/Binary/Greater.php
@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Greater extends Twig_Node_Expression_Binary
+{
+    public function operator($compiler)
+    {
+        return $compiler->raw('>');
+    }
+}
diff --git a/lib/Twig/Node/Expression/Binary/GreaterEqual.php b/lib/Twig/Node/Expression/Binary/GreaterEqual.php
new file mode 100644
index 0000000..7fe974b
--- /dev/null
+++ b/lib/Twig/Node/Expression/Binary/GreaterEqual.php
@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_GreaterEqual extends Twig_Node_Expression_Binary
+{
+    public function operator($compiler)
+    {
+        return $compiler->raw('>=');
+    }
+}
diff --git a/lib/Twig/Node/Expression/Binary/In.php b/lib/Twig/Node/Expression/Binary/In.php
new file mode 100644
index 0000000..b59544e
--- /dev/null
+++ b/lib/Twig/Node/Expression/Binary/In.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_In extends Twig_Node_Expression_Binary
+{
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile($compiler)
+    {
+        $compiler
+            ->raw('twig_in_filter(')
+            ->subcompile($this->getNode('left'))
+            ->raw(', ')
+            ->subcompile($this->getNode('right'))
+            ->raw(')')
+        ;
+    }
+
+    public function operator($compiler)
+    {
+        return $compiler->raw('in');
+    }
+}
diff --git a/lib/Twig/Node/Expression/Binary/Less.php b/lib/Twig/Node/Expression/Binary/Less.php
new file mode 100644
index 0000000..42fc5df
--- /dev/null
+++ b/lib/Twig/Node/Expression/Binary/Less.php
@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Less extends Twig_Node_Expression_Binary
+{
+    public function operator($compiler)
+    {
+        return $compiler->raw('<');
+    }
+}
diff --git a/lib/Twig/Node/Expression/Binary/LessEqual.php b/lib/Twig/Node/Expression/Binary/LessEqual.php
new file mode 100644
index 0000000..0f4b52c
--- /dev/null
+++ b/lib/Twig/Node/Expression/Binary/LessEqual.php
@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_LessEqual extends Twig_Node_Expression_Binary
+{
+    public function operator($compiler)
+    {
+        return $compiler->raw('<=');
+    }
+}
diff --git a/lib/Twig/Node/Expression/Binary/NotEqual.php b/lib/Twig/Node/Expression/Binary/NotEqual.php
new file mode 100644
index 0000000..84bee67
--- /dev/null
+++ b/lib/Twig/Node/Expression/Binary/NotEqual.php
@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_NotEqual extends Twig_Node_Expression_Binary
+{
+    public function operator($compiler)
+    {
+        return $compiler->raw('!=');
+    }
+}
diff --git a/lib/Twig/Node/Expression/Binary/NotIn.php b/lib/Twig/Node/Expression/Binary/NotIn.php
new file mode 100644
index 0000000..486e879
--- /dev/null
+++ b/lib/Twig/Node/Expression/Binary/NotIn.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_NotIn extends Twig_Node_Expression_Binary
+{
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile($compiler)
+    {
+        $compiler
+            ->raw('!twig_in_filter(')
+            ->subcompile($this->getNode('left'))
+            ->raw(', ')
+            ->subcompile($this->getNode('right'))
+            ->raw(')')
+        ;
+    }
+
+    public function operator($compiler)
+    {
+        return $compiler->raw('not in');
+    }
+}
diff --git a/lib/Twig/Node/Expression/Binary/Power.php b/lib/Twig/Node/Expression/Binary/Power.php
new file mode 100644
index 0000000..4eede5e
--- /dev/null
+++ b/lib/Twig/Node/Expression/Binary/Power.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Power extends Twig_Node_Expression_Binary
+{
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile($compiler)
+    {
+        $compiler
+            ->raw('pow(')
+            ->subcompile($this->getNode('left'))
+            ->raw(', ')
+            ->subcompile($this->getNode('right'))
+            ->raw(')')
+        ;
+    }
+
+    public function operator($compiler)
+    {
+        return $compiler->raw('**');
+    }
+}
diff --git a/lib/Twig/Node/Expression/Binary/Range.php b/lib/Twig/Node/Expression/Binary/Range.php
new file mode 100644
index 0000000..b7f1e91
--- /dev/null
+++ b/lib/Twig/Node/Expression/Binary/Range.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Range extends Twig_Node_Expression_Binary
+{
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile($compiler)
+    {
+        $compiler
+            ->raw('twig_range_filter(')
+            ->subcompile($this->getNode('left'))
+            ->raw(', ')
+            ->subcompile($this->getNode('right'))
+            ->raw(')')
+        ;
+    }
+
+    public function operator($compiler)
+    {
+        return $compiler->raw('..');
+    }
+}
diff --git a/lib/Twig/Node/Expression/Compare.php b/lib/Twig/Node/Expression/Compare.php
deleted file mode 100644
index c87be9a..0000000
--- a/lib/Twig/Node/Expression/Compare.php
+++ /dev/null
@@ -1,61 +0,0 @@
-<?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.
- */
-class Twig_Node_Expression_Compare extends Twig_Node_Expression
-{
-    public function __construct(Twig_Node_Expression $expr, Twig_NodeInterface $ops, $lineno)
-    {
-        parent::__construct(array('expr' => $expr, 'ops' => $ops), array(), $lineno);
-    }
-
-    public function compile($compiler)
-    {
-        if ('in' === $this->getNode('ops')->getNode('0')->getAttribute('value')) {
-            return $this->compileIn($compiler);
-        }
-
-        $this->getNode('expr')->compile($compiler);
-
-        $nbOps = count($this->getNode('ops'));
-        for ($i = 0; $i < $nbOps; $i += 2) {
-            if ($i > 0) {
-                $compiler->raw(' && ($tmp'.($i / 2));
-            }
-
-            $compiler->raw(' '.$this->getNode('ops')->getNode($i)->getAttribute('value').' ');
-
-            if ($i != $nbOps - 2) {
-                $compiler
-                    ->raw('($tmp'.(($i / 2) + 1).' = ')
-                    ->subcompile($this->getNode('ops')->getNode($i + 1))
-                    ->raw(')')
-                ;
-            } else {
-                $compiler->subcompile($this->getNode('ops')->getNode($i + 1));
-            }
-        }
-
-        for ($j = 1; $j < $i / 2; $j++) {
-            $compiler->raw(')');
-        }
-    }
-
-    protected function compileIn($compiler)
-    {
-        $compiler
-            ->raw('twig_in_filter(')
-            ->subcompile($this->getNode('expr'))
-            ->raw(', ')
-            ->subcompile($this->getNode('ops')->getNode(1))
-            ->raw(')')
-        ;
-    }
-}
diff --git a/lib/Twig/Token.php b/lib/Twig/Token.php
index 0b4e0cb..8bbe8c0 100644
--- a/lib/Twig/Token.php
+++ b/lib/Twig/Token.php
@@ -25,6 +25,7 @@ class Twig_Token
     const NUMBER_TYPE      = 6;
     const STRING_TYPE      = 7;
     const OPERATOR_TYPE    = 8;
+    const PUNCTUATION_TYPE = 9;
 
     public function __construct($type, $value, $lineno)
     {
@@ -112,6 +113,9 @@ class Twig_Token
             case self::OPERATOR_TYPE:
                 $name = 'OPERATOR_TYPE';
                 break;
+            case self::PUNCTUATION_TYPE:
+                $name = 'PUNCTUATION_TYPE';
+                break;
             default:
                 throw new Twig_Error_Syntax(sprintf('Token of type %s does not exist.', $type));
         }
diff --git a/lib/Twig/TokenParser/For.php b/lib/Twig/TokenParser/For.php
index 758fb4a..4fec054 100644
--- a/lib/Twig/TokenParser/For.php
+++ b/lib/Twig/TokenParser/For.php
@@ -22,7 +22,7 @@ class Twig_TokenParser_For extends Twig_TokenParser
     {
         $lineno = $token->getLine();
         $targets = $this->parser->getExpressionParser()->parseAssignmentExpression();
-        $this->parser->getStream()->expect('in');
+        $this->parser->getStream()->expect(Twig_Token::OPERATOR_TYPE, 'in');
         $seq = $this->parser->getExpressionParser()->parseExpression();
 
         $withLoop = true;
diff --git a/test/Twig/Tests/Fixtures/expressions/comparison.test b/test/Twig/Tests/Fixtures/expressions/comparison.test
index 4ed77e5..726b850 100644
--- a/test/Twig/Tests/Fixtures/expressions/comparison.test
+++ b/test/Twig/Tests/Fixtures/expressions/comparison.test
@@ -5,7 +5,6 @@ Twig supports comparison operators (==, !=, <, >, >=, <=)
 {{ 1 < 2 }}/{{ 1 < 1 }}/{{ 1 <= 2 }}/{{ 1 <= 1 }}
 {{ 1 == 1 }}/{{ 1 == 2 }}
 {{ 1 != 1 }}/{{ 1 != 2 }}
-{{ 1 < 2 < 3 }}/{{ 1 < 2 < 3 < 4 }}
 --DATA--
 return array()
 --EXPECT--
@@ -13,4 +12,3 @@ return array()
 1//1/1
 1/
 /1
-1/1
diff --git a/test/Twig/Tests/Fixtures/filters/in.test b/test/Twig/Tests/Fixtures/filters/in.test
deleted file mode 100644
index 4d6e337..0000000
--- a/test/Twig/Tests/Fixtures/filters/in.test
+++ /dev/null
@@ -1,27 +0,0 @@
---TEST--
-"in" filter
---TEMPLATE--
-{{ 1|in([1, 2, 3]) }}
-{{ 5|in([1, 2, 3]) }}
-{{ 'cd'|in('abcde') }}
-{{ 'ad'|in('abcde') }}
-{{ 'foo'|in(foo) }}
-{{ 'a'|in(foo|keys) }}
---DATA--
-class ItemsIteratorForInFilter implements Iterator
-{
-  protected $values = array('a' => 'foo', 'b' => 'bar');
-  public function current() { return current($this->values); }
-  public function key() { return key($this->values); }
-  public function next() { return next($this->values); }
-  public function rewind() { return reset($this->values); }
-  public function valid() { return false !== current($this->values); }
-}
-return array('foo' => new ItemsIteratorForInFilter())
---EXPECT--
-1
-
-1
-
-1
-1
diff --git a/test/Twig/Tests/Node/Expression/CompareTest.php b/test/Twig/Tests/Node/Expression/CompareTest.php
deleted file mode 100644
index fb98ff8..0000000
--- a/test/Twig/Tests/Node/Expression/CompareTest.php
+++ /dev/null
@@ -1,72 +0,0 @@
-<?php
-
-/*
- * This file is part of Twig.
- *
- * (c) Fabien Potencier
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-require_once dirname(__FILE__).'/../TestCase.php';
-
-class Twig_Tests_Node_Expression_CompareTest extends Twig_Tests_Node_TestCase
-{
-    /**
-     * @covers Twig_Node_Expression_Compare::__construct
-     */
-    public function testConstructor()
-    {
-        $expr = new Twig_Node_Expression_Constant(1, 0);
-        $ops = new Twig_Node(array(
-            new Twig_Node_Expression_Constant('>', 0),
-            new Twig_Node_Expression_Constant(2, 0),
-        ), array(), 0);
-        $node = new Twig_Node_Expression_Compare($expr, $ops, 0);
-
-        $this->assertEquals($expr, $node->getNode('expr'));
-        $this->assertEquals($ops, $node->getNode('ops'));
-    }
-
-    /**
-     * @covers Twig_Node_Expression_Compare::compile
-     * @covers Twig_Node_Expression_Compare::compileIn
-     * @dataProvider getTests
-     */
-    public function testCompile($node, $source, $environment = null)
-    {
-        parent::testCompile($node, $source, $environment);
-    }
-
-    public function getTests()
-    {
-        $tests = array();
-
-        $expr = new Twig_Node_Expression_Constant(1, 0);
-        $ops = new Twig_Node(array(
-            new Twig_Node_Expression_Constant('>', 0),
-            new Twig_Node_Expression_Constant(2, 0),
-        ), array(), 0);
-        $node = new Twig_Node_Expression_Compare($expr, $ops, 0);
-        $tests[] = array($node, '1 > 2');
-
-        $ops = new Twig_Node(array(
-            new Twig_Node_Expression_Constant('>', 0),
-            new Twig_Node_Expression_Constant(2, 0),
-            new Twig_Node_Expression_Constant('<', 0),
-            new Twig_Node_Expression_Constant(4, 0),
-        ), array(), 0);
-        $node = new Twig_Node_Expression_Compare($expr, $ops, 0);
-        $tests[] = array($node, '1 > ($tmp1 = 2) && ($tmp1 < 4)');
-
-        $ops = new Twig_Node(array(
-            new Twig_Node_Expression_Constant('in', 0),
-            new Twig_Node_Expression_Constant(2, 0),
-        ), array(), 0);
-        $node = new Twig_Node_Expression_Compare($expr, $ops, 0);
-        $tests[] = array($node, 'twig_in_filter(1, 2)');
-
-        return $tests;
-    }
-}