// The main method. Here we set-up the entire file and execute it.
public static void Main(string[] args)
{
try
{
StackManipulation stack = new StackManipulation();
ArithmeticOperators arOp = new ArithmeticOperators(stack);
LogicalOperators loOp = new LogicalOperators(stack);
RelationalOperators relOp = new RelationalOperators(stack);
Output output = new Output(stack);
// Get the filename, parse the code, and analyze it
string filename = (new JazInterpreter()).getFileName(args);
string[,] array = (new CodeParser()).Parse(filename);
(new Analyzer()).Analyze(array);
// instruction pointer is used to decide where we are in the code
int instructionPointer = 0;
// defines current variable scope
int currentLevel = 0;
// flags for scoping
bool isAfterBeginButBeforeCall = false;
bool isAfterCallButBeforeEnd = false;
while (true)
{
switch (array[instructionPointer, 0])
{
case "push":
stack.Push(Int32.Parse(array[instructionPointer, 1]));
break;
case "rvalue":
if (isAfterCallButBeforeEnd)
{
Identifier identifier = SymbolsTable.VariableTable[currentLevel + 1].Find(x => x.Name == array[instructionPointer, 1]);
stack.RValue(identifier);
}
else
{
Identifier identifier = SymbolsTable.VariableTable[currentLevel].Find(x => x.Name == array[instructionPointer, 1]);
stack.RValue(identifier);
}
break;
case "lvalue":
if (isAfterBeginButBeforeCall)
{
Identifier identifier2 = SymbolsTable.VariableTable[currentLevel + 1].Find(x => x.Name == array[instructionPointer, 1]);
stack.LValue(identifier2);
}
else
{
Identifier identifier2 = SymbolsTable.VariableTable[currentLevel].Find(x => x.Name == array[instructionPointer, 1]);
stack.LValue(identifier2);
}
break;
case "pop":
stack.Pop();
break;
case ":=":
stack.ColonEquals();
break;
case "copy":
stack.Copy();
break;
case "label":
break;
case "goto":
instructionPointer = ControlFlow.Goto(array[instructionPointer, 1]);
break;
case "gofalse":
if (!Convert.ToBoolean(stack.Peek()))
{
instructionPointer = ControlFlow.Gofalse(array[instructionPointer, 1]);
}
stack.Pop();
break;
case "gotrue":
if (Convert.ToBoolean(stack.Peek()))
{
instructionPointer = ControlFlow.Gotrue(array[instructionPointer, 1]);
}
stack.Pop();
break;
case "halt":
return;
case "+":
arOp.Add();
break;
case "-":
arOp.Subtract();
break;
case "*":
arOp.Multiply();
break;
case "/":
arOp.Divide();
break;
case "div":
arOp.Mod();
break;
case "&":
loOp.And();
break;
case "!":
loOp.Not();
break;
case "|":
loOp.Or();
break;
case "<>":
relOp.NotEqual();
break;
case "<=":
relOp.LessThanOrEqualTo();
break;
case ">=":
relOp.GreaterThanOrEqualTo();
break;
case "<":
relOp.LessThan();
break;
case ">":
relOp.GreaterThan();
break;
case "=":
relOp.Equal();
break;
case "print":
output.Print();
break;
case "show":
output.Show(array[instructionPointer, 1]);
break;
case "begin":
isAfterBeginButBeforeCall = true;
SymbolsTable.AddLevel(currentLevel);
break;
case "end":
//need to remove level
SymbolsTable.VariableTable.RemoveAt(currentLevel + 1);
isAfterBeginButBeforeCall = false;
isAfterCallButBeforeEnd = false;
break;
case "return":
//return needs to decrement the leve and restore everything
currentLevel--;
instructionPointer = stack.PeekAndPop();
isAfterBeginButBeforeCall = false;
isAfterCallButBeforeEnd = true;
break;
case "call":
//call needs to save the current instruction pointer, set the instruction pointer to the next level,
//increment the level, reset the boolean flags
stack.Push(instructionPointer);
isAfterBeginButBeforeCall = false;
isAfterCallButBeforeEnd = false;
currentLevel++;
instructionPointer = SymbolsTable.LabelTable [array [instructionPointer, 1]];
break;
case "":
break;
default:
Console.WriteLine("YOU DID SOMETHING VERY BAD");
break;
}
instructionPointer++;
}
} catch (Exception e)
{
Console.WriteLine(e.Message);
}
}