From: Daniel Jasper <djasper@google.com>
Date: Tue, 4 Dec 2012 11:54:27 +0000 (+0000)
Subject: Add parameterCountIs() matcher.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=36e29d6732814e958aea4b2f403cec63d7ed3116;p=clang

Add parameterCountIs() matcher.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169257 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/clang/ASTMatchers/ASTMatchers.h b/include/clang/ASTMatchers/ASTMatchers.h
index a70dd5c378..71ce10f893 100644
--- a/include/clang/ASTMatchers/ASTMatchers.h
+++ b/include/clang/ASTMatchers/ASTMatchers.h
@@ -1974,6 +1974,19 @@ AST_MATCHER_P(FunctionDecl, hasAnyParameter,
   return false;
 }
 
+/// \brief Matches \c FunctionDecls that have a specific parameter count.
+///
+/// Given
+/// \code
+///   void f(int i) {}
+///   void g(int i, int j) {}
+/// \endcode
+/// functionDecl(parameterCountIs(2))
+///   matches g(int i, int j) {}
+AST_MATCHER_P(FunctionDecl, parameterCountIs, unsigned, N) {
+  return Node.getNumParams() == N;
+}
+
 /// \brief Matches the return type of a function declaration.
 ///
 /// Given:
diff --git a/unittests/ASTMatchers/ASTMatchersTest.cpp b/unittests/ASTMatchers/ASTMatchersTest.cpp
index ad072aa7ce..f3d377b771 100644
--- a/unittests/ASTMatchers/ASTMatchersTest.cpp
+++ b/unittests/ASTMatchers/ASTMatchersTest.cpp
@@ -1238,6 +1238,14 @@ TEST(Matcher, ArgumentCount) {
   EXPECT_TRUE(notMatches("void x(int, int) { x(0, 0); }", Call1Arg));
 }
 
+TEST(Matcher, ParameterCount) {
+  DeclarationMatcher Function1Arg = functionDecl(parameterCountIs(1));
+  EXPECT_TRUE(matches("void f(int i) {}", Function1Arg));
+  EXPECT_TRUE(matches("class X { void f(int i) {} };", Function1Arg));
+  EXPECT_TRUE(notMatches("void f() {}", Function1Arg));
+  EXPECT_TRUE(notMatches("void f(int i, int j, int k) {}", Function1Arg));
+}
+
 TEST(Matcher, References) {
   DeclarationMatcher ReferenceClassX = varDecl(
       hasType(references(recordDecl(hasName("X")))));