support for Loop ... End, Break, and Continue.

error.h

@@ -4,14 +4,41 @@
 #include <stdexcept>
 #include <system_error>
 
-class execution_of_input_terminated : public std::runtime_error {
+class mpw_error : public std::runtime_error {
 public:
-	execution_of_input_terminated(int status = -9) : 
-	std::runtime_error("MPW Shell - Execution of input Terminated."), _status(status)
+	mpw_error(int status, const std::string &s) : std::runtime_error(s), _status(status)
 	{}
+
+	mpw_error(int status, const char *s) : std::runtime_error(s), _status(status)
+	{}
+
 	constexpr int status() const noexcept { return _status; }
 private:
-	int _status;
+		int _status;
 };
 
+class execution_of_input_terminated : public mpw_error {
+public:
+	execution_of_input_terminated(int status = -9) :
+		mpw_error(status, "MPW Shell - Execution of input Terminated.")
+	{}
+};
+
+
+class break_error : public mpw_error {
+public:
+	break_error(int status = -3) : 
+	mpw_error(status, "MPW Shell - Break must be within for or loop.")
+	{}
+};
+
+class continue_error : public mpw_error {
+public:
+	continue_error(int status = -3) : 
+	mpw_error(status, "MPW Shell - Continue must be within for or loop.")
+	{}
+};
+
+
+
 #endif