From e4c7a1a8d2f93aab9f1f1c478174d0b78d9b6115 Mon Sep 17 00:00:00 2001
From: DNKpp <dnkpp2011@gmail.com>
Date: Tue, 24 Sep 2024 22:33:32 +0200
Subject: [PATCH] feat: MIMICPP_DETAIL_STRIP_PARENS and related helper macros

---
 include/mimic++/InterfaceMock.hpp | 19 ++++++++++++-
 test/unit-tests/InterfaceMock.cpp | 47 ++++++++++++++++++++++++++++---
 2 files changed, 61 insertions(+), 5 deletions(-)

diff --git a/include/mimic++/InterfaceMock.hpp b/include/mimic++/InterfaceMock.hpp
index ff635b36c..94f1a4e30 100644
--- a/include/mimic++/InterfaceMock.hpp
+++ b/include/mimic++/InterfaceMock.hpp
@@ -16,8 +16,25 @@
 namespace mimicpp
 {
 	/**
-	 * \defgroup INTERFACES interfaces
+	 * \defgroup MOCK_INTERFACES interfaces
 	 * \ingroup MOCK
 	 * \brief Contains utility to simplify interface mocking.
 	 */
+
+	/**
+	 * \defgroup MOCK_INTERFACES_DETAIL detail
+	 * \ingroup MOCK_INTERFACES
+	 */
 }
+
+/**
+ * \brief Removes an enclosing pair of (), if present.
+ * \ingroup MOCK_INTERFACES_DETAIL
+ * \param x token
+ * \see Inspired by https://stackoverflow.com/a/62984543
+ */
+#define MIMICPP_DETAIL_STRIP_PARENS(x) MIMICPP_DETAIL_STRIP_PARENS_OUTER(MIMICPP_DETAIL_STRIP_PARENS_INNER x)
+#define MIMICPP_DETAIL_STRIP_PARENS_INNER(...) MIMICPP_DETAIL_STRIP_PARENS_INNER __VA_ARGS__
+#define MIMICPP_DETAIL_STRIP_PARENS_OUTER(...) MIMICPP_DETAIL_STRIP_PARENS_OUTER_(__VA_ARGS__)
+#define MIMICPP_DETAIL_STRIP_PARENS_OUTER_(...) MIMICPP_DETAIL_STRIP_PARENS_STRIPPED_ ## __VA_ARGS__
+#define MIMICPP_DETAIL_STRIP_PARENS_STRIPPED_MIMICPP_DETAIL_STRIP_PARENS_INNER
diff --git a/test/unit-tests/InterfaceMock.cpp b/test/unit-tests/InterfaceMock.cpp
index 77826e311..21788f996 100644
--- a/test/unit-tests/InterfaceMock.cpp
+++ b/test/unit-tests/InterfaceMock.cpp
@@ -1,7 +1,7 @@
- //          Copyright Dominic (DNKpp) Koepke 2024 - 2024.
- // Distributed under the Boost Software License, Version 1.0.
- //    (See accompanying file LICENSE_1_0.txt or copy at
- //          https://www.boost.org/LICENSE_1_0.txt)
+// //          Copyright Dominic (DNKpp) Koepke 2024 - 2024.
+// // Distributed under the Boost Software License, Version 1.0.
+// //    (See accompanying file LICENSE_1_0.txt or copy at
+// //          https://www.boost.org/LICENSE_1_0.txt)
 
 #include "TestReporter.hpp"
 #include "TestTypes.hpp"
@@ -16,4 +16,43 @@
 #include <catch2/matchers/catch_matchers_string.hpp>
 #include <catch2/matchers/catch_matchers_templated.hpp>
 
+using namespace mimicpp;
 
+#define TO_STRING_IMPL(...) #__VA_ARGS__
+#define TO_STRING(...) TO_STRING_IMPL(__VA_ARGS__)
+
+TEST_CASE(
+	"MIMICPP_DETAIL_STRIP_PARENS removes outer parens, if present.",
+	"[mock][mock::interface]"
+)
+{
+	namespace Matches = Catch::Matchers;
+
+	REQUIRE_THAT(
+		TO_STRING(MIMICPP_DETAIL_STRIP_PARENS()),
+		Matches::Equals(""));
+
+	REQUIRE_THAT(
+		TO_STRING(MIMICPP_DETAIL_STRIP_PARENS(())),
+		Matches::Equals(""));
+
+	REQUIRE_THAT(
+		TO_STRING(MIMICPP_DETAIL_STRIP_PARENS((()))),
+		Matches::Equals("()"));
+
+	REQUIRE_THAT(
+		TO_STRING(MIMICPP_DETAIL_STRIP_PARENS(Test())),
+		Matches::Equals("Test()"));
+
+	REQUIRE_THAT(
+		TO_STRING(MIMICPP_DETAIL_STRIP_PARENS((Test()))),
+		Matches::Equals("Test()"));
+
+	REQUIRE_THAT(
+		TO_STRING(MIMICPP_DETAIL_STRIP_PARENS(((Test())))),
+		Matches::Equals("(Test())"));
+
+	REQUIRE_THAT(
+		TO_STRING(MIMICPP_DETAIL_STRIP_PARENS(((,Test(),)))),
+		Matches::Equals("(,Test(),)"));
+}