converted the constant filter to a function

CHANGELOG

@@ -4,6 +4,7 @@ Backward incompatibilities:
 
  * the items filter, which has been deprecated for quite a long time now, has been removed
  * the range filter has been converted to a function: 0|range(10) -> range(0, 10)
+ * the constant filter has been converted to a function: {{ some_date|date('DATE_W3C'|constant) }} -> {{ some_date|date(constant('DATE_W3C')) }}
 
 Changes:
 

doc/templates.rst

@@ -1303,15 +1303,6 @@ the last filter applied to it.
       {{ var|raw }} {# var won't be escaped #}
     {% autoescape off %}
 
-``constant`` (new in Twig 0.9.9)
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-``constant`` returns the constant value for a given string:
-
-.. code-block:: jinja
-
-    {{ some_date|date('DATE_W3C'|constant) }}
-
 ``merge`` (new in Twig 0.9.10)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -1456,6 +1447,15 @@ step of 1):
         {{ i }},
     {% endfor %}
 
+``constant``
+~~~~~~~~~~~~
+
+``constant`` returns the constant value for a given string:
+
+.. code-block:: jinja
+
+    {{ some_date|date(constant('DATE_W3C')) }}
+
 Extensions
 ----------
 

lib/Twig/Extension/Core.php

@@ -57,7 +57,6 @@ class Twig_Extension_Core extends Twig_Extension
             'upper'      => new Twig_Filter_Function('strtoupper'),
             'lower'      => new Twig_Filter_Function('strtolower'),
             'striptags'  => new Twig_Filter_Function('strip_tags'),
-            'constant'   => new Twig_Filter_Function('constant'),
 
             // array helpers
             'join'    => new Twig_Filter_Function('twig_join_filter'),
@@ -93,6 +92,7 @@ class Twig_Extension_Core extends Twig_Extension
     {
         return array(
             'fn_range' => new Twig_Function($this, 'getRange'),
+            'fn_constant' => new Twig_Function($this, 'getConstant'),
         );
     }
 
@@ -101,6 +101,11 @@ class Twig_Extension_Core extends Twig_Extension
         return range($start, $end, $step);
     }
 
+    public function getConstant($value)
+    {
+        return constant($value);
+    }
+
     /**
      * Returns a list of filters to add to the existing list.
      *

test/Twig/Tests/Fixtures/functions/constant.test

@@ -1,7 +1,7 @@
 --TEST--
 "constant" filter
 --TEMPLATE--
-{{ date|date('DATE_W3C'|constant) }}
+{{ date|date(constant('DATE_W3C')) }}
 --DATA--
 $d = date_default_timezone_get();
 date_default_timezone_set('UTC');

test/Twig/Tests/Fixtures/tags/include/only.test

@@ -10,7 +10,7 @@
 --DATA--
 return array('foo' => 'bar')
 --EXPECT--
-fn_range,foo,_parent,
-fn_range,_parent,
-fn_range,foo,foo1,_parent,
-fn_range,foo1,_parent,
+fn_range,fn_constant,foo,_parent,
+fn_range,fn_constant,_parent,
+fn_range,fn_constant,foo,foo1,_parent,
+fn_range,fn_constant,foo1,_parent,