Started implementing Lexer errors

Lexer/inc/Lexer.h

@@ -4,7 +4,7 @@
 
 namespace LXC::Lexer
 {
-	struct LexerContext
+	struct LexerContext final
 	{
 		// Constructor to set the information of the context //
 		LexerContext(const std::string& _source);
@@ -21,8 +21,36 @@ namespace LXC::Lexer
 		unsigned short line;
 	};
 
-	struct LexerError
-	{};
+	struct LexerError final
+	{
+		// Different reasons why the Lexer can fail //
+		enum Reason
+		{
+			InvalidCharacter,
+			UnterminatedStringLiteral
+		};
+
+		// Constructor to pass arguments through to the struct //
+		LexerError(Reason _reason, __int32 errorIndex)
+			: reason(_reason), index(errorIndex)
+		{}
+
+		// Turns the error into a c-string //
+		inline static const char* const ReasonStr(Reason reason)
+		{
+			static const char* reasons[] =
+			{
+				"Invalid character found in source: ",
+				"Unterminated string literal in source starting at: "
+			};
+
+			return reasons[reason];
+		}
+
+		// Error information //
+		const Reason reason;
+		const __int32 index;
+	};
 
 	// Turns a file into a vector of tokens //
 	Util::ReturnVal<LexerOutput, LexerError> TokenizeFile(const std::string& fileContents);