Fixed using of unary operators with default parameters

lib/Twig/ExpressionParser.php

@@ -164,6 +164,21 @@ class Twig_ExpressionParser
                     $this->parser->getStream()->next();
                     $node = new Twig_Node_Expression_Name($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_Neg';
+                    $posClass = 'Twig_Node_Expression_Unary_Pos';
+                    if (!(in_array($ref->getName(), array($negClass, $posClass)) || $ref->isSubclassOf($negClass) || $ref->isSubclassOf($posClass))) {
+                        throw new Twig_Error_Syntax(sprintf('Unexpected unary operator "%s"', $token->getValue()), $token->getLine(), $this->parser->getFilename());
+                    }
+
+                    $this->parser->getStream()->next();
+                    $expr = $this->parsePrimaryExpression();
+
+                    $node = new $class($expr, $token->getLine());
+                    break;
                 }
 
             default:
@@ -583,7 +598,9 @@ class Twig_ExpressionParser
     // checks that the node only contains "constant" elements
     protected function checkConstantExpression(Twig_NodeInterface $node)
     {
-        if (!($node instanceof Twig_Node_Expression_Constant || $node instanceof Twig_Node_Expression_Array)) {
+        if (!($node instanceof Twig_Node_Expression_Constant || $node instanceof Twig_Node_Expression_Array
+            || $node instanceof Twig_Node_Expression_Unary_Neg || $node instanceof Twig_Node_Expression_Unary_Pos
+        )) {
             return false;
         }
 

lib/Twig/Node/Expression/Unary.php

@@ -18,12 +18,9 @@ abstract class Twig_Node_Expression_Unary extends Twig_Node_Expression
 
     public function compile(Twig_Compiler $compiler)
     {
-        $compiler->raw('(');
+        $compiler->raw(' ');
         $this->operator($compiler);
-        $compiler
-            ->subcompile($this->getNode('node'))
-            ->raw(')')
-        ;
+        $compiler->subcompile($this->getNode('node'));
     }
 
     abstract public function operator(Twig_Compiler $compiler);

test/Twig/Tests/Fixtures/expressions/unary_macro_arguments.test

@@ -0,0 +1,30 @@
+--TEST--
+Twig manages negative numbers as default parameters
+--TEMPLATE--
+{% import _self as macros %}
+{{ macros.negative_number1() }}
+{{ macros.negative_number2() }}
+{{ macros.negative_number3() }}
+{{ macros.positive_number1() }}
+{{ macros.positive_number2() }}
+{% macro negative_number1(nb=-1) %}{{ nb }}{% endmacro %}
+{% macro negative_number2(nb = --1) %}{{ nb }}{% endmacro %}
+{% macro negative_number3(nb = - 1) %}{{ nb }}{% endmacro %}
+{% macro positive_number1(nb = +1) %}{{ nb }}{% endmacro %}
+{% macro positive_number2(nb = ++1) %}{{ nb }}{% endmacro %}
+{{ -1 }}
+{{ - 1 }}
+{{ 5 - 1 }}
+{{ 5-1 }}
+--DATA--
+return array()
+--EXPECT--
+-1
+1
+-1
+1
+1
+-1
+-1
+4
+4

test/Twig/Tests/Node/Expression/Unary/NegTest.php

@@ -38,7 +38,8 @@ class Twig_Tests_Node_Expression_Unary_NegTest extends Twig_Test_NodeTestCase
         $node = new Twig_Node_Expression_Unary_Neg($node, 1);
 
         return array(
-            array($node, '(-1)'),
+            array($node, '-1'),
+            array(new Twig_Node_Expression_Unary_Neg($node, 1), '- -1'),
         );
     }
 }

test/Twig/Tests/Node/Expression/Unary/NotTest.php

@@ -38,7 +38,7 @@ class Twig_Tests_Node_Expression_Unary_NotTest extends Twig_Test_NodeTestCase
         $node = new Twig_Node_Expression_Unary_Not($node, 1);
 
         return array(
-            array($node, '(!1)'),
+            array($node, '!1'),
         );
     }
 }

test/Twig/Tests/Node/Expression/Unary/PosTest.php

@@ -38,7 +38,7 @@ class Twig_Tests_Node_Expression_Unary_PosTest extends Twig_Test_NodeTestCase
         $node = new Twig_Node_Expression_Unary_Pos($node, 1);
 
         return array(
-            array($node, '(+1)'),
+            array($node, '+1'),
         );
     }
 }