Merge pull request sass#517 from wonja/call_function

call function (Fixes sass#418) it works I seen it with my own eyes

Author: Aaron Leung

context.cpp

@@ -418,6 +418,7 @@ namespace Sass {
     register_function(ctx, global_variable_exists_sig, global_variable_exists, env);
     register_function(ctx, function_exists_sig, function_exists, env);
     register_function(ctx, mixin_exists_sig, mixin_exists, env);
+    register_function(ctx, call_sig, call, env);
     // Boolean Functions
     register_function(ctx, not_sig, sass_not, env);
     register_function(ctx, if_sig, sass_if, env);

functions.cpp

@@ -1348,6 +1348,23 @@ namespace Sass {
       }
     }
 
+    Signature call_sig = "call($name, $args...)";
+    BUILT_IN(call)
+    {
+      string name = unquote(ARG("$name", String_Constant)->value());
+      List* arglist = new (ctx.mem) List(*ARG("$args", List));
+
+      Arguments* args = new (ctx.mem) Arguments(path, position);
+      for (size_t i = 0, L = arglist->length(); i < L; ++i) {
+        Argument* arg = new (ctx.mem) Argument(path, position, arglist->value_at_index(i));
+        *args << arg;
+      }
+      Function_Call* func = new (ctx.mem) Function_Call(path, position, name, args);
+      Eval eval(ctx, &d_env, backtrace);
+      return func->perform(&eval);
+
+    }
+
     ////////////////////
     // BOOLEAN FUNCTIONS
     ////////////////////

functions.hpp

@@ -93,6 +93,7 @@ namespace Sass {
     extern Signature global_variable_exists_sig;
     extern Signature function_exists_sig;
     extern Signature mixin_exists_sig;
+    extern Signature call_sig;
     extern Signature not_sig;
     extern Signature if_sig;
     extern Signature image_url_sig;
@@ -162,6 +163,7 @@ namespace Sass {
     BUILT_IN(global_variable_exists);
     BUILT_IN(function_exists);
     BUILT_IN(mixin_exists);
+    BUILT_IN(call);
     BUILT_IN(sass_not);
     BUILT_IN(sass_if);
     BUILT_IN(image_url);