template template parameters patch tidyup

- Document change in CHANGES file
- Minor tweaks and whitespace fixes in stype.c
- Enhance testcase
- Synchronise Java and Python runt test in testcase

CHANGES.current

@@ -7,6 +7,9 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.1.0 (in progress)
 ===========================
 
+2021-03-22: goto40
+            #1977 Fix handling of template template parameters.
+
 2021-03-21: olly
 	    #1929, #1978 [PHP] Add support for PHP 8.
 

Examples/test-suite/java/template_template_parameters_runme.java

@@ -34,7 +34,12 @@ public class template_template_parameters_runme {
     IntTestStruct intTestStruct = new IntTestStruct();
     IntContainer1 intContainer1 = intTestStruct.getX();
     intContainer1.setX(91);
-    if (intContainer1.getX()!=91) 
+    if (intContainer1.getX() != 91)
+      throw new RuntimeException("Failed");
+    if (intTestStruct.getX().getX() != 91)
+      throw new RuntimeException("Failed");
+    IntTestStruct intTestStructReturned = template_template_parameters.TestStructContainer1Method(intTestStruct);
+    if (intTestStructReturned.getX().getX() != 101)
       throw new RuntimeException("Failed");
   }
 }

Examples/test-suite/python/template_template_parameters_runme.py

@@ -1,5 +1,18 @@
 from template_template_parameters import *
 
+# Test first part
+listBool = ListFastBool()
+listBool.item = True
+x_boolean = listBool.allotype
+if listBool.item != True:
+  raise RuntimeError("Failed")
+
+listDouble = ListDefaultDouble()
+listDouble.item = 10.2
+x_double = listDouble.allotype
+if listDouble.item != 10.2:
+  raise RuntimeError("Failed")
+
 # Test second part
 floatTestStruct = FloatTestStruct()
 floatContainer2 = floatTestStruct.x
@@ -7,8 +20,11 @@ floatContainer2.x = 8.1
 intTestStruct = IntTestStruct()
 intContainer1 = intTestStruct.x
 intContainer1.x = 91
-if intContainer1.x!=91:
+if intContainer1.x != 91:
   raise RuntimeError("Failed")
-if intTestStruct.x.x!=91:
+if intTestStruct.x.x != 91:
+  raise RuntimeError("Failed")
+intTestStructReturned = TestStructContainer1Method(intTestStruct)
+if intTestStructReturned.x.x != 101:
   raise RuntimeError("Failed")
 

Examples/test-suite/template_template_parameters.i

@@ -48,6 +48,11 @@ struct TestStruct {
     TemplateTemplateT<BaseT> x;
 };
 
+TestStruct<int, Container1> TestStructContainer1Method(TestStruct<int, Container1> ts1) {
+  ts1.x.x += 10;
+  return ts1;
+}
+
 %}
 
 /* part 1 */
@@ -61,8 +66,8 @@ struct TestStruct {
 %template(DoubleAllocFast) pfc::alloc_fast<double>;
 
 /* part 2 */
-%template(IntTestStruct) TestStruct<int, Container1>;
-%template(FloatTestStruct) TestStruct<float, Container2>;
 %template(IntContainer1) Container1<int>;
 %template(FloatContainer2) Container2<float>;
+%template(IntTestStruct) TestStruct<int, Container1>;
+%template(FloatTestStruct) TestStruct<float, Container2>;
 

Source/Swig/stype.c

@@ -1296,22 +1296,21 @@ void SwigType_typename_replace(SwigType *t, String *pat, String *rep) {
 	   * with "pat=TemplateTemplateT"
 	   * we need to compare only the first part of the string e.
 	   */
-      int len = DohLen(pat);
+	  int len = Len(pat);
 
-      /* DohLen(e) > len, not >= (because we expecte at least a
+	  /* Len(e) > len, not >= (because we expect at least a
 	   * character '<' following the template typename)
 	   */
-      if (DohLen(e)>len) {
+	  if (Len(e) > len) {
 	    String *firstPartOfType = NewStringWithSize(e, len);
-        const char* e_as_char = DohData(e);
+	    const char* e_as_char = Char(e);
 
-        if (Equal(firstPartOfType, pat) && e_as_char[len]=='<') {
+	    if (Equal(firstPartOfType, pat) && e_as_char[len] == '<') {
 	      String *repbase = SwigType_templateprefix(rep);
 	      Replace(e, pat, repbase, DOH_REPLACE_ID | DOH_REPLACE_FIRST);
 	      Delete(repbase);
 	    }
 	    Delete(firstPartOfType);
-  
 	  }
 	}