move tuple helper to its own file, and allow the user to redefine fragments through the fragments.i file

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@6234 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Lib/python/cstring.i

@@ -10,7 +10,7 @@
  * some way.
  */
 
-%include "fragments.i"
+%include "pytuplehlp.swg"
 
 /* %cstring_input_binary(TYPEMAP, SIZE)
  * 

SWIG/Lib/python/fragments.i

@@ -1,28 +1,23 @@
-/* Helper function to return tuples */
+/*
+
+  Create a file with this name, 'fragments.i', in your working
+  directory and add all the %fragments you want to take precedence
+  over the ones defined by default by swig.
+
+  For example, if you add:
+  
+  %fragment(SWIG_AsVal_frag(int),"header") {
+   SWIGSTATICINLINE(int)
+   SWIG_AsVal(int)(PyObject *obj, int *val)
+   { 
+     <your code here>;
+   }
+  }
+  
+  this will replace the code used to retreive an integer value for all
+  the typemaps that need it, including:
+  
+    int, std::vector<int>, std::list<std::pair<int,int> >, etc.
 
-%fragment("t_output_helper","header") %{
-  static PyObject* t_output_helper(PyObject* target, PyObject* o) {
-    PyObject*   o2;
-    PyObject*   o3;
     
-    if (!target) {                   
+*/
-        target = o;
-    } else if (target == Py_None) {  
-        Py_DECREF(Py_None);
-        target = o;
-    } else {                         
-        o2 = target;
-        target = PyTuple_New(1);
-        PyTuple_SetItem(target, 0, o2);
-
-        o3 = PyTuple_New(1);            
-        PyTuple_SetItem(o3, 0, o);      
-
-        o2 = target;
-        target = PySequence_Concat(o2, o3); 
-        Py_DECREF(o2);                      
-        Py_DECREF(o3);
-    }
-    return target;
-}
-%}

SWIG/Lib/python/pyinout.swg

@@ -123,7 +123,7 @@ output values.
 // Author: Robin Dunn
 //----------------------------------------------------------------------
 
-%include fragments.i
+%include pytuplehlp.swg
 
 %define _PYVAL_OUTPUT_TYPEMAP(from_meth, from_frag, Type)
  %typemap(in,numinputs=0) Type *OUTPUT ($*1_ltype temp, int res = 0), 
@@ -193,7 +193,7 @@ phased out in future releases.
 %enddef
 
 #ifndef SWIG_INOUT_NODEF
-#define PYVAL_INPUT_TYPEMAP(code,_a,_c,_af,_cf,...)			        \
+#define PYVAL_INPUT_TYPEMAP(code,_a,_c,_af,_cf,...)			\
   _PYVAL_INPUT_TYPEMAP(SWIG_arg(code),SWIG_arg(_a),SWIG_arg(_c),	\
 		       SWIG_arg(_af),SWIG_arg(_cf),SWIG_arg(__VA_ARGS__))
 

SWIG/Lib/python/python.swg

@@ -22,6 +22,14 @@
 %include "pymacros.swg"
 
 
+/* -----------------------------------------------------------------------------
+ *  Look for user fragments.i file, if not, include empty system one.
+ * ----------------------------------------------------------------------------- */
+
+
+%include "fragments.i"
+
+
 /* -----------------------------------------------------------------------------
  *  SWIGTYPE typemaps
  * ----------------------------------------------------------------------------- */

SWIG/Lib/python/pytuplehlp.swg

@@ -0,0 +1,28 @@
+/* Helper function to return tuples */
+
+%fragment("t_output_helper","header") %{
+  static PyObject* t_output_helper(PyObject* target, PyObject* o) {
+    PyObject*   o2;
+    PyObject*   o3;
+    
+    if (!target) {                   
+        target = o;
+    } else if (target == Py_None) {  
+        Py_DECREF(Py_None);
+        target = o;
+    } else {                         
+        o2 = target;
+        target = PyTuple_New(1);
+        PyTuple_SetItem(target, 0, o2);
+
+        o3 = PyTuple_New(1);            
+        PyTuple_SetItem(o3, 0, o);      
+
+        o2 = target;
+        target = PySequence_Concat(o2, o3); 
+        Py_DECREF(o2);                      
+        Py_DECREF(o3);
+    }
+    return target;
+}
+%}