Simple patch to allow fragments to include other fragments:

%fragment("Hello","header") "..."

%fragment("Hi","header",fragment="Hello") "..."

the latter fragment will include the first one if is invoked.

more than one fragment can be included at the time, just
keep adding fragment="f1",fragment="f2", etc.

this is used to emulate typemaps reuse, where all the
reusable typemap code is put in a fragment static method,
and then it can be included from another fragment typemap
as needed.


git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@5690 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/fragments.i

@@ -0,0 +1,36 @@
+%module fragments
+
+
+%fragment("Hello","header") %{
+/* hello!!! */
+int foobar(int a)
+{
+  return a;
+}  
+%}
+
+/*
+ this fragment include the previous fragment if needed.
+*/
+
+%fragment("Hi","header",fragment="Hello") %{
+/* hi!!! */
+int bar(int a)
+{
+  return foobar(a);
+}  
+%}
+
+%typemap(in,fragment="Hi") int hola "$1 = 123;";
+
+
+%inline %{
+
+int bar(int a);
+
+int foo(int hola) 
+{
+  return bar(hola);
+}
+
+%}

Source/CParse/parser.y

@@ -1266,17 +1266,21 @@ except_directive : EXCEPT LPAREN ID RPAREN LBRACE {
    %fragment(name,location) { ... }
    ------------------------------------------------------------ */
 
-fragment_directive: FRAGMENT LPAREN idstring COMMA idstring RPAREN HBLOCK {
+fragment_directive: FRAGMENT LPAREN kwargs RPAREN HBLOCK {
+		 Hash *p = nextSibling($3);
                  $$ = new_node("fragment");
-                 Setattr($$,"section", $5);
-                 Setattr($$,"name",$3);
-                 Setattr($$,"code",$7);
+                 Setattr($$,"section", Getattr(p,"name"));
+                 Setattr($$,"name",Getattr($3,"name"));
+                 Setattr($$,"kwargs",nextSibling(p));
+                 Setattr($$,"code",$5);
                  }
-                 | FRAGMENT LPAREN idstring COMMA idstring RPAREN LBRACE {
+                 | FRAGMENT LPAREN kwargs RPAREN LBRACE {
+		   Hash *p = nextSibling($3);
                    skip_balanced('{','}');
 		   $$ = new_node("fragment");
-		   Setattr($$,"section",$5);
-		   Setattr($$,"name",$3);
+		   Setattr($$,"section", Getattr(p,"name"));
+		   Setattr($$,"name",Getattr($3,"name"));
+		   Setattr($$,"kwargs",nextSibling(p));
 		   Delitem(scanner_ccode,0);
 		   Delitem(scanner_ccode,DOH_END);
 		   Setattr($$,"code",Copy(scanner_ccode));

Source/Modules/lang.cxx

@@ -461,10 +461,7 @@ int Language::constantDirective(Node *n) {
  * ---------------------------------------------------------------------- */
 
 int Language::fragmentDirective(Node *n) {
-  String *name = Getattr(n,"name");
-  String *code = Getattr(n,"code");
-  String *section = Getattr(n,"section");
-  Swig_fragment_register(name,section,code);
+  Swig_fragment_register(n);
   return SWIG_OK;
 }
 

Source/Swig/fragment.c

@@ -23,17 +23,21 @@ static Hash *fragments = 0;
 /* -----------------------------------------------------------------------------
  * Swig_fragment_register()
  *
- * Add a fragment.
+ * Add a fragment. Use the original Node*, so, if something needs to be
+ * changed, lang.cxx doesn't nedd to be touched again.
  * ----------------------------------------------------------------------------- */
 
 void
-Swig_fragment_register(String *name, String *section, String *code) {
-  String *ccode;
+Swig_fragment_register(Node* fragment) {
+  String *name = Getattr(fragment,"name");
+  String *section = Getattr(fragment,"section");
+  String *ccode = Copy(Getattr(fragment,"code"));
+  Hash *kwargs = Getattr(fragment,"kwargs");
   if (!fragments) {
     fragments = NewHash();
   }
-  ccode = Copy(code);
   Setmeta(ccode,"section",Copy(section));
+  if (kwargs) Setmeta(ccode,"kwargs",Copy(kwargs));
   Setattr(fragments,Copy(name),ccode);
 }
 
@@ -51,6 +55,13 @@ Swig_fragment_emit(String *name) {
   code = Getattr(fragments,name);
   if (code) {
     String *section = Getmeta(code,"section");
+    Hash *n = Getmeta(code,"kwargs");
+    while (n) {
+      if (Cmp(Getattr(n,"name"),"fragment") == 0) {
+	Swig_fragment_emit(Getattr(n,"value"));
+      }
+      n = nextSibling(n);
+    }
     if (section) {
       File *f = Swig_filebyname(section);
       if (!f) {

Source/Swig/swig.h

@@ -499,7 +499,7 @@ extern void   Swig_typemap_attach_parms(const String_or_char *op, ParmList *parm
 
 /* --- Code fragment support --- */
 
-extern  void  Swig_fragment_register(String *name, String *section, String *code);
+extern  void  Swig_fragment_register(Node* fragment);
 extern  void  Swig_fragment_emit(String *name);
 
 /* hacks defined in C++ ! */