Implement incorrect stringification operator processing

Author: bnoazx005

source/tcppLibrary.hpp

@@ -274,6 +274,7 @@ namespace tcpp
 		ELIF_BLOCK_AFTER_ELSE_FOUND,
 		UNDEFINED_DIRECTIVE,
 		INCORRECT_OPERATION_USAGE,
+		INCORRECT_STRINGIFY_OPERATOR_USAGE,
 	};
 
 
@@ -411,6 +412,8 @@ namespace tcpp
 				return "#elif found after #else block";
 			case E_ERROR_TYPE::UNDEFINED_DIRECTIVE:
 				return "Undefined directive";
+			case E_ERROR_TYPE::INCORRECT_STRINGIFY_OPERATOR_USAGE:
+				return "Incorrect usage of stringification operation.";
 		}
 
 		return "";
@@ -1291,6 +1294,8 @@ namespace tcpp
 			{
 				desc.mValue.push_back(currToken);
 
+				const bool isStringificationOperator = currToken.mType == E_TOKEN_TYPE::STRINGIZE_OP;
+
 				switch (currToken.mType)
 				{
 					case E_TOKEN_TYPE::CONCAT_OP:
@@ -1307,6 +1312,16 @@ namespace tcpp
 						continue;
 					}
 
+					if (E_TOKEN_TYPE::IDENTIFIER == currToken.mType && isStringificationOperator) // \note Validate argument of the operator
+					{
+						auto&& macroArgs = desc.mArgsNames;
+						
+						if (std::find(macroArgs.cbegin(), macroArgs.cend(), currToken.mRawView) == macroArgs.cend())
+						{
+							mOnErrorCallback({ E_ERROR_TYPE::INCORRECT_STRINGIFY_OPERATOR_USAGE, mpLexer->GetCurrLineIndex() });
+						}
+					}
+
 					desc.mValue.push_back(currToken);
 				}
 			}

tests/coreTests.cpp

@@ -932,7 +932,7 @@ FIRST((1, 2) c, 3)
 		std::string output = preprocessor.Process();
 		REQUIRE((result && output == "\n(1, 2) c\n"));
 	}
-#if 0
+
 	SECTION("TestProcess_StringifyOperatorInvokedOnNonParameterToken_ProcessingErrorOccurs")
 	{
 		std::string inputSource = R"(
@@ -947,17 +947,19 @@ TEST(3)
 		Preprocessor preprocessor(lexer, { [&result](auto&& arg)
 		{
 			std::cerr << "Error: " << ErrorTypeToString(arg.mType) << std::endl;
+
+			REQUIRE(arg.mType == E_ERROR_TYPE::INCORRECT_STRINGIFY_OPERATOR_USAGE);
 			result = false;
 		}, [](auto&&, auto&&)
 		{
 			return nullptr;
 		},
 		true });
 
-		preprocessor.Process();
+		const std::string& output = preprocessor.Process();
 		REQUIRE(!result);
 	}
-#endif
+
 	SECTION("TestProcess_PassEmptyArg_MacroExpanded")
 	{
 		std::string inputSource = R"(