The kwargs feature no longer turns on compactdefaultargs for languages that don't support kwargs.

Affects all languages except Python and Ruby.

Closes #242

Source/CParse/parser.y

@@ -59,6 +59,7 @@ static int      compact_default_args = 0;
 static int      template_reduce = 0;
 static int      cparse_externc = 0;
 int		ignore_nested_classes = 0;
+int		kwargs_supported = 0;
 /* -----------------------------------------------------------------------------
  *                            Assist Functions
  * ----------------------------------------------------------------------------- */
@@ -1177,7 +1178,7 @@ static void default_arguments(Node *n) {
     if (compact_default_args 
 	|| is_cfunction(function) 
 	|| GetFlag(function,"feature:compactdefaultargs") 
-	|| GetFlag(function,"feature:kwargs")) {
+	|| (GetFlag(function,"feature:kwargs") && kwargs_supported)) {
       ParmList *p = Getattr(function,"parms");
       if (p) 
         Setattr(p,"compactdefargs", "1"); /* mark parameters for special handling */

Source/Modules/lang.cxx

@@ -3525,6 +3525,14 @@ Language::NestedClassSupport Language::nestedClassesSupport() const {
   return NCS_Unknown;
 }
 
+/* -----------------------------------------------------------------------------
+ * Language::kwargsSupport()
+ * ----------------------------------------------------------------------------- */
+
+bool Language::kwargsSupport() const {
+  return false;
+}
+
 /* -----------------------------------------------------------------------------
  * Language::is_wrapping_class()
  * ----------------------------------------------------------------------------- */

Source/Modules/main.cxx

@@ -50,6 +50,7 @@ int SwigRuntime = 0;		// 0 = no option, 1 = -runtime, 2 = -noruntime
 extern "C" {
   extern String *ModuleName;
   extern int ignore_nested_classes;
+  extern int kwargs_supported;
 }
 
 /* usage string split into multiple parts otherwise string is too big for some compilers */
@@ -904,6 +905,8 @@ int SWIG_main(int argc, char *argv[], Language *l) {
   // Inform the parser if the nested classes should be ignored unless explicitly told otherwise via feature:flatnested
   ignore_nested_classes = l->nestedClassesSupport() == Language::NCS_Unknown ? 1 : 0;
 
+  kwargs_supported = l->kwargsSupport() ? 1 : 0;
+
   // Create Library search directories
 
   // Check for SWIG_LIB environment variable

Source/Modules/python.cxx

@@ -4785,6 +4785,13 @@ public:
     return NewString("swigpyrun.h");
   }
 
+  /*----------------------------------------------------------------------
+   * kwargsSupport()
+   *--------------------------------------------------------------------*/
+
+  bool kwargsSupport() const {
+    return true;
+  }
 };
 
 /* ---------------------------------------------------------------

Source/Modules/ruby.cxx

@@ -3426,6 +3426,14 @@ public:
   String *defaultExternalRuntimeFilename() {
     return NewString("swigrubyrun.h");
   }
+
+  /*----------------------------------------------------------------------
+   * kwargsSupport()
+   *--------------------------------------------------------------------*/
+
+  bool kwargsSupport() const {
+    return true;
+  }
 };				/* class RUBY */
 
 /* -----------------------------------------------------------------------------

Source/Modules/swigmod.h

@@ -315,6 +315,9 @@ public:
   */
   virtual NestedClassSupport nestedClassesSupport() const;
 
+  /* Returns true if the target language supports key word arguments (kwargs) */
+  virtual bool kwargsSupport() const;
+
 protected:
   /* Identifies if a protected members that are generated when the allprotected option is used.
      This does not include protected virtual methods as they are turned on with the dirprot option. */