[PATCH] D85536: [clang] Add a matcher for template template parameters.

[Bruno Ricci via Phabricator via cfe-commits]

riccibruno created this revision.
riccibruno added reviewers: aaron.ballman, klimek, njames93.
riccibruno added a project: clang.
Herald added a subscriber: cfe-commits.
riccibruno requested review of this revision.

There are already matchers for type template parameters and non-type template parameters, but somehow no matcher exists for template template parameters and I need it to write unit tests.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D85536

Files:
  clang/include/clang/ASTMatchers/ASTMatchers.h
  clang/lib/ASTMatchers/ASTMatchersInternal.cpp
  clang/lib/ASTMatchers/Dynamic/Registry.cpp
  clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp


Index: clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp
===================================================================
--- clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp
+++ clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp
@@ -408,6 +408,15 @@
   EXPECT_TRUE(notMatches("template <int N> void f();", templateTypeParmDecl()));
 }
 
+TEST_P(ASTMatchersTest, TemplateTemplateParmDecl) {
+  if (!GetParam().isCXX())
+    return;
+  EXPECT_TRUE(matches("template <template <typename> class Z> void f();",
+                      templateTemplateParmDecl(hasName("Z"))));
+  EXPECT_TRUE(notMatches("template <typename, int> void f();",
+                         templateTemplateParmDecl()));
+}
+
 TEST_P(ASTMatchersTest, UserDefinedLiteral) {
   if (!GetParam().isCXX11OrLater()) {
     return;
Index: clang/lib/ASTMatchers/Dynamic/Registry.cpp
===================================================================
--- clang/lib/ASTMatchers/Dynamic/Registry.cpp
+++ clang/lib/ASTMatchers/Dynamic/Registry.cpp
@@ -514,6 +514,7 @@
   REGISTER_MATCHER(templateArgumentCountIs);
   REGISTER_MATCHER(templateName);
   REGISTER_MATCHER(templateSpecializationType);
+  REGISTER_MATCHER(templateTemplateParmDecl);
   REGISTER_MATCHER(templateTypeParmDecl);
   REGISTER_MATCHER(templateTypeParmType);
   REGISTER_MATCHER(throughUsingDecl);
Index: clang/lib/ASTMatchers/ASTMatchersInternal.cpp
===================================================================
--- clang/lib/ASTMatchers/ASTMatchersInternal.cpp
+++ clang/lib/ASTMatchers/ASTMatchersInternal.cpp
@@ -739,6 +739,9 @@
     nonTypeTemplateParmDecl;
 const internal::VariadicDynCastAllOfMatcher<Decl, TemplateTypeParmDecl>
     templateTypeParmDecl;
+const internal::VariadicDynCastAllOfMatcher<Decl, TemplateTemplateParmDecl>
+    templateTemplateParmDecl;
+
 const internal::VariadicAllOfMatcher<QualType> qualType;
 const internal::VariadicAllOfMatcher<Type> type;
 const internal::VariadicAllOfMatcher<TypeLoc> typeLoc;
Index: clang/include/clang/ASTMatchers/ASTMatchers.h
===================================================================
--- clang/include/clang/ASTMatchers/ASTMatchers.h
+++ clang/include/clang/ASTMatchers/ASTMatchers.h
@@ -549,6 +549,18 @@
 extern const internal::VariadicDynCastAllOfMatcher<Decl, TemplateTypeParmDecl>
     templateTypeParmDecl;
 
+/// Matches template template parameter declarations.
+///
+/// Given
+/// \code
+///   template <template <typename> class Z, int N> struct C {};
+/// \endcode
+/// templateTypeParmDecl()
+///   matches 'Z', but not 'N'.
+extern const internal::VariadicDynCastAllOfMatcher<Decl,
+                                                   TemplateTemplateParmDecl>
+    templateTemplateParmDecl;
+
 /// Matches public C++ declarations and C++ base specifers that specify public
 /// inheritance.
 ///


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