Support special variable expansion in %extend.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@13871 626c5289-ae23-0410-ae9c-e8d60b6d4f22

CHANGES.current

@@ -4,16 +4,21 @@ See the RELEASENOTES file for a summary of changes in each release.
 
 Version 2.0.9 (in progress)
 ===========================
+2012-10-11: wsfulton
+            Most of the special variables available for use in %exception are now also available for expansion in
+            %extend blocks. These are: $name $symname $overname $decl $fulldecl $parentname $parentsymname, see docs
+            on "Class extension" in SWIGPlus.html. Patch based on submission from Kris Thielemans.
+
+2012-10-10: wsfulton
+            Additional new special variables in %exception are expanded as follows:
+              $parentname - The parent class name (if any) for a method.
+              $parentsymname - The target language parent class name (if any) for a method.
+
 2012-10-08: iant
 	    [Go] Generating Go code now requires using the -intgosize option to
 	    indicate the size of the 'int' type in Go.  This is because the
 	    size of the type is changing from Go 1.0 to Go 1.1 for x86_64. 
 
-2012-09-14: wsfulton
-            Additional new special variables in %exception are expanded as follows:
-              $parentname - The parent class name (if any) for a method.
-              $parentsymname - The target language parent class name (if any) for a method.
-
 2012-09-14: wsfulton
 	    Add new warning if the empty template instantiation is used as a base class, for example:
 

Doc/Manual/Customization.html

@@ -454,6 +454,11 @@ variables are replaced with.
 <td>The actual operation to be performed (a function call, method invocation, variable access, etc.)</td>
 </tr>
 
+<tr>
+<td>$name</td>
+<td>The C/C++ symbol name for the function.</td>
+</tr>
+
 <tr>
 <td>$symname</td>
 <td>The symbol name used internally by SWIG</td>

Doc/Manual/SWIGPlus.html

@@ -2838,6 +2838,12 @@ struct Derived : Base {
 }
 </pre></div>
 
+<p>
+The following special variables are expanded if used within a %extend block: 
+$name, $symname, $overname, $decl, $fulldecl, $parentname and $parentsymname.
+The <a href="Customization.html#Customization_exception_special_variables">Special variables</a> section provides more information each of these special variables.
+</p>
+
 <p>
 The<tt> %extend</tt> directive follows all of the same conventions
 as its use with C structures. Please refer to the <a href="SWIG.html#SWIG_adding_member_functions">Adding member functions to C structures</a>

Examples/test-suite/common.mk

@@ -204,6 +204,7 @@ CPP_TEST_CASES += \
 	extend_constructor_destructor \
 	extend_default \
 	extend_placement \
+	extend_special_variables \
 	extend_template \
 	extend_template_ns \
 	extend_typedef_class \

Examples/test-suite/extend_special_variables.i

@@ -0,0 +1,21 @@
+%module extend_special_variables
+
+%rename(ForExtensionNewName) ForExtension;
+%rename(extended_renamed) ForExtension::extended;
+
+%extend ForExtension {
+  ForExtension() {
+    return new ForExtension();
+  }
+  const char* extended() {
+    return "name:$name symname:$symname wrapname:$wrapname overname:$overname decl:$decl fulldecl:$fulldecl parentclasssymname:$parentclasssymname parentclassname:$parentclassname";
+  }
+  const char* extended(int) {
+    return "name:$name symname:$symname wrapname:$wrapname overname:$overname decl:$decl fulldecl:$fulldecl parentclasssymname:$parentclasssymname parentclassname:$parentclassname";
+  }
+}
+
+%inline %{
+struct ForExtension {
+};
+%}

Examples/test-suite/java/extend_special_variables_runme.java

@@ -0,0 +1,25 @@
+
+import extend_special_variables.*;
+
+public class extend_special_variables_runme {
+
+  static {
+    try {
+        System.loadLibrary("extend_special_variables");
+    } catch (UnsatisfiedLinkError e) {
+      System.err.println("Native code library failed to load. See the chapter on Dynamic Linking Problems in the SWIG Java documentation for help.\n" + e);
+      System.exit(1);
+    }
+  }
+
+  public static void main(String argv[]) 
+  {
+    ForExtensionNewName f = new ForExtensionNewName();
+    verify(f.extended_renamed(), "name:extended symname:extended_renamed wrapname: overname:__SWIG_0 decl:ForExtension::extended() fulldecl:char const * ForExtension::extended() parentclasssymname:ForExtensionNewName parentclassname:ForExtension");
+    verify(f.extended_renamed(10), "name:extended symname:extended_renamed wrapname: overname:__SWIG_1 decl:ForExtension::extended(int) fulldecl:char const * ForExtension::extended(int) parentclasssymname:ForExtensionNewName parentclassname:ForExtension");
+  }
+  static void verify(String received, String expected) {
+    if (!received.equals(expected))
+      throw new RuntimeException("Incorrect, received: " + received);
+  }
+}

Source/Modules/emit.cxx

@@ -363,39 +363,9 @@ int emit_action_code(Node *n, String *wrappercode, String *eaction) {
     tm = Copy(tm);
   if ((tm) && Len(tm) && (Strcmp(tm, "1") != 0)) {
     if (Strstr(tm, "$")) {
-      Replaceall(tm, "$name", Getattr(n, "name"));
-      Replaceall(tm, "$symname", Getattr(n, "sym:name"));
+      Swig_replace_special_variables(n, parentNode(n), tm);
       Replaceall(tm, "$function", eaction); // deprecated
       Replaceall(tm, "$action", eaction);
-      Replaceall(tm, "$wrapname", Getattr(n, "wrap:name"));
-      String *overloaded = Getattr(n, "sym:overloaded");
-      Replaceall(tm, "$overname", overloaded ? Char(Getattr(n, "sym:overname")) : "");
-
-      if (Strstr(tm, "$decl")) {
-        String *decl = Swig_name_decl(n);
-        Replaceall(tm, "$decl", decl);
-        Delete(decl);
-      }
-      if (Strstr(tm, "$fulldecl")) {
-        String *fulldecl = Swig_name_fulldecl(n);
-        Replaceall(tm, "$fulldecl", fulldecl);
-        Delete(fulldecl);
-      }
-
-      Node *parentnode = parentNode(n);
-      Node *parentclass = (parentnode && Equal(nodeType(parentnode), "class")) ? parentnode : 0;
-      if (Strstr(tm, "$parentclasssymname")) {
-	String *parentclasssymname = 0;
-	if (parentclass)
-	  parentclasssymname = Getattr(parentclass, "sym:name");
-	Replaceall(tm, "$parentclasssymname", parentclasssymname ? parentclasssymname : "");
-      }
-      if (Strstr(tm, "$parentclassname")) {
-	String *parentclassname = 0;
-	if (parentclass)
-	  parentclassname = Getattr(parentclass, "name");
-	Replaceall(tm, "$parentclassname", parentclassname ? parentclassname : "");
-      }
     }
     Printv(wrappercode, tm, "\n", NIL);
     Delete(tm);

Source/Swig/cwrap.c

@@ -759,6 +759,46 @@ String *Swig_cmemberget_call(const_String_or_char_ptr name, SwigType *t, String
   return func;
 }
 
+/* -----------------------------------------------------------------------------
+ * Swig_replace_special_variables()
+ *
+ * Replaces special variables with a value from the supplied node
+ * ----------------------------------------------------------------------------- */
+void Swig_replace_special_variables(Node *n, Node *parentnode, String *code) {
+  Node *parentclass = parentnode;
+  String *overloaded = Getattr(n, "sym:overloaded");
+  Replaceall(code, "$name", Getattr(n, "name"));
+  Replaceall(code, "$symname", Getattr(n, "sym:name"));
+  Replaceall(code, "$wrapname", Getattr(n, "wrap:name"));
+  Replaceall(code, "$overname", overloaded ? Char(Getattr(n, "sym:overname")) : "");
+
+  if (Strstr(code, "$decl")) {
+    String *decl = Swig_name_decl(n);
+    Replaceall(code, "$decl", decl);
+    Delete(decl);
+  }
+  if (Strstr(code, "$fulldecl")) {
+    String *fulldecl = Swig_name_fulldecl(n);
+    Replaceall(code, "$fulldecl", fulldecl);
+    Delete(fulldecl);
+  }
+
+  if (parentclass && !Equal(nodeType(parentclass), "class"))
+    parentclass = 0;
+  if (Strstr(code, "$parentclasssymname")) {
+    String *parentclasssymname = 0;
+    if (parentclass)
+      parentclasssymname = Getattr(parentclass, "sym:name");
+    Replaceall(code, "$parentclasssymname", parentclasssymname ? parentclasssymname : "");
+  }
+  if (Strstr(code, "$parentclassname")) {
+    String *parentclassname = 0;
+    if (parentclass)
+      parentclassname = Getattr(parentclass, "name");
+    Replaceall(code, "$parentclassname", parentclassname ? parentclassname : "");
+  }
+}
+
 /* -----------------------------------------------------------------------------
  * extension_code()
  *
@@ -767,14 +807,17 @@ String *Swig_cmemberget_call(const_String_or_char_ptr name, SwigType *t, String
  *        return_type function_name(parms) code
  *
  * ----------------------------------------------------------------------------- */
-static String *extension_code(const String *function_name, ParmList *parms, SwigType *return_type, const String *code, int cplusplus, const String *self) {
+static String *extension_code(Node *n, const String *function_name, ParmList *parms, SwigType *return_type, const String *code, int cplusplus, const String *self) {
   String *parms_str = cplusplus ? ParmList_str_defaultargs(parms) : ParmList_str(parms);
   String *sig = NewStringf("%s(%s)", function_name, parms_str);
   String *rt_sig = SwigType_str(return_type, sig);
   String *body = NewStringf("SWIGINTERN %s", rt_sig);
   Printv(body, code, "\n", NIL);
-  if (self)
-    Replaceall(body, "$self", self);
+  if (Strstr(body, "$")) {
+    Swig_replace_special_variables(n, parentNode(parentNode(n)), body);
+    if (self)
+      Replaceall(body, "$self", self);
+  }
   Delete(parms_str);
   Delete(sig);
   Delete(rt_sig);
@@ -791,7 +834,7 @@ static String *extension_code(const String *function_name, ParmList *parms, Swig
  *
  * ----------------------------------------------------------------------------- */
 int Swig_add_extension_code(Node *n, const String *function_name, ParmList *parms, SwigType *return_type, const String *code, int cplusplus, const String *self) {
-  String *body = extension_code(function_name, parms, return_type, code, cplusplus, self);
+  String *body = extension_code(n, function_name, parms, return_type, code, cplusplus, self);
   Setattr(n, "wrap:code", body);
   Delete(body);
   return SWIG_OK;

Source/Swig/swig.h

@@ -354,6 +354,7 @@ extern int        ParmList_is_compactdefargs(ParmList *p);
   extern String *Swig_cmemberget_call(const_String_or_char_ptr name, SwigType *t, String *self, int varcref);
 
   extern int Swig_add_extension_code(Node *n, const String *function_name, ParmList *parms, SwigType *return_type, const String *code, int cplusplus, const String *self);
+  extern void Swig_replace_special_variables(Node *n, Node *parentnode, String *code);
 
 /* --- Transformations --- */