private object HandleIf()
{
IfInstruction ifAux = new IfInstruction();
UL = LexicalUnit();
ifAux.Cond = ReadCondition();
if (UL != TypeSymbol.U_Then)
{
GetSyntaxError(WordMessagesError.NotFound, "\"Then\" KeyWord");
}
ifAux.Ins = ReadOneOrListOfInstruction();
ifAux.InsElse = null; // be deufault
if (UL == TypeSymbol.U_Else)
{
ifAux.InsElse = ReadOneOrListOfInstruction();
}
return(ifAux);
}
private TypeSymbol ExecuteListOfInstructions(BaseInstruction linst)
{
while (linst != null)
{
if (linst.Ins is CallInstruction)
{
CallInstruction callaux = linst.Ins as CallInstruction;
UL = ExecuteCall(callaux);
if (UL == TypeSymbol.U_Return)
{
// warning but I condiered it as error;
GetRuntimeError(RuntimeMessagesError.ReturnInProcedure);
}
if (UL == TypeSymbol.U_Halt)
{
return(UL);
}
}
else if (linst.Ins is IfInstruction)
{
IfInstruction ifaux = linst.Ins as IfInstruction;
UL = ExecuteListOfInstructions((EvaluateCondition(ifaux.Cond)) ? ifaux.Ins : ifaux.InsElse);
if (UL == TypeSymbol.U_Halt || UL == TypeSymbol.U_Break ||
UL == TypeSymbol.U_Return || UL == TypeSymbol.U_Exit)
{
return(UL);
}
}
else if (linst.Ins is WhileInstruction)
{
WhileInstruction whileaux = linst.Ins as WhileInstruction;
while (EvaluateCondition(whileaux.Cond))
{
UL = ExecuteListOfInstructions(whileaux.Ins);
if (UL == TypeSymbol.U_Halt || UL == TypeSymbol.U_Return ||
UL == TypeSymbol.U_Exit)
{
return(UL);
}
if (UL == TypeSymbol.U_Break)
{
break;
}
}
}
else if (linst.Ins is ForInstruction)
{
ForInstruction foraux = linst.Ins as ForInstruction;
TExpression expB = EvaluateInteger(foraux.ExpBegin);
TExpression expE = EvaluateInteger(foraux.ExpEnd);
TExpression step = EvaluateInteger(foraux.ExpStep);
if (!foraux.IsDown)
{
Assign(foraux.V, 0, expB);
while (expB.ValNB <= expE.ValNB)
{
UL = ExecuteListOfInstructions(foraux.Ins);
if (UL == TypeSymbol.U_Halt || UL == TypeSymbol.U_Return ||
UL == TypeSymbol.U_Exit)
{
return(UL);
}
if (UL == TypeSymbol.U_Break)
{
break;
}
// expB.ValNB = expB.ValNB + 1;
expB.ValNB = expB.ValNB + step.ValNB;
Assign(foraux.V, 0, expB);
}
}
else
{
Assign(foraux.V, 0, expB);
while (expB.ValNB >= expE.ValNB)
{
UL = ExecuteListOfInstructions(foraux.Ins);
if (UL == TypeSymbol.U_Halt || UL == TypeSymbol.U_Return ||
UL == TypeSymbol.U_Exit)
{
return(UL);
}
if (UL == TypeSymbol.U_Break)
{
break;
}
// expB.ValNB = expB.ValNB + 1;
expB.ValNB = expB.ValNB - step.ValNB;
Assign(foraux.V, 0, expB);
}
}
Free(ref expB);
Free(ref expE);
Free(ref step);
}
else if (linst.Ins is DoWhileInstruction)
{
#if doc
DoWhileInstruction doaux = linst.Ins as DoWhileInstruction;
do
{
UL = ExecuteListOfInstructions(doaux.Ins);
if (UL == TypeSymbol.U_Halt || UL == TypeSymbol.U_Return ||
UL == TypeSymbol.U_Exit)
{
return(UL);
}
if (UL == TypeSymbol.U_Break)
{
break;
}
} while (EvaluateCondition(doaux.Cond));
#else
//ExecuteOneTimeLoopAtLeast(linst.Ins as TConditionBase, true);
#endif
}
else if (linst.Ins is RepeatUntilInstruction)
{
#if doc
RepeatUntilInstruction repeataux = linst.Ins as RepeatUntilInstruction;
do
{
UL = ExecuteListOfInstructions(repeataux.Ins);
if (UL == TypeSymbol.U_Halt || UL == TypeSymbol.U_Return ||
UL == TypeSymbol.U_Exit)
{
return(UL);
}
if (UL == TypeSymbol.U_Break)
{
break;
}
} while (!EvaluateCondition(repeataux.Cond));
#else
ExecuteOneTimeLoopAtLeast(linst.Ins as TConditionBase, false)
#endif
}
else if (linst.Ins is BreakInstruction)
{
return((linst.Ins as BreakInstruction).UL);
}
else if (linst.Ins is ReturnInstruction)
{
ReturnInstruction returnaux = linst.Ins as ReturnInstruction;
GReturn = returnaux;
return(TypeSymbol.U_Return);
}
else if (linst.Ins is AssignInstruction)
{
AssignInstruction assignaux = linst.Ins as AssignInstruction;
Func <TExpression, TExpression, TExpression> a = (expValue, op) =>
{
expValue.Next = op;
op.Prev = expValue;
TExpression varExpression = new TExpression {
UL = TypeSymbol.U_Var
};
varExpression.ValVar = assignaux.Var;
varExpression.Index = TExpression.CopyExpression(assignaux.index);
varExpression.Next = expValue;
expValue.Prev = varExpression;
return(EvaluateExpression(varExpression));
};
TExpression exp0;
TExpression expOperator;
if (assignaux.Exp != null) // = , += , -= , *= , /=, ^= , %=
{
exp0 = EvaluateExpression(assignaux.Exp);
if (assignaux.UL != TypeSymbol.U_Assignment) // += , -= , *= , /=, ^= , %=
{
TypeSymbol ulAux;
if (assignaux.UL == TypeSymbol.U_PluseAssigment)
{
ulAux = TypeSymbol.U_Pluse;
}
else if (assignaux.UL == TypeSymbol.U_MinusAssigment)
{
ulAux = TypeSymbol.U_Minus;
}
else if (assignaux.UL == TypeSymbol.U_MultiplyAssigment)
{
ulAux = TypeSymbol.U_Multiply;
}
else if (assignaux.UL == TypeSymbol.U_DivisionAssigment)
{
ulAux = TypeSymbol.U_Division;
}
else if (assignaux.UL == TypeSymbol.U_PowAssigment)
{
ulAux = TypeSymbol.U_Pow;
}
else //if (assignaux.UL == TypeSymbol.U_ModAssigment)
{
ulAux = TypeSymbol.U_Mod;
}
expOperator = new TExpression {
UL = ulAux
};
exp0 = EvaluateExpression(assignaux.Exp);
if ((exp0.Next != null) || (exp0.Prev != null))
{
throw new ArgumentException("This is notification for me hakam");
}
expOperator = new TExpression {
UL = ulAux
};
exp0 = EvaluateExpression(assignaux.Exp);
if ((exp0.Next != null) || (exp0.Prev != null))
{
throw new ArgumentException("This is notification for me hakam");
}
exp0 = a(exp0, expOperator);
}
}
else // ++ , --
{
exp0 = new TExpression {
UL = TypeSymbol.U_Cst_Int, ValNB = 1
};
if (assignaux.UL == TypeSymbol.U_PlusePluse)
{
expOperator = new TExpression {
UL = TypeSymbol.U_Pluse
};
}
else
{
expOperator = new TExpression {
UL = TypeSymbol.U_Minus
};
}
exp0 = a(exp0, expOperator);
}
if (assignaux.index == null)
{
Assign(assignaux.Var, 0, exp0);
}
else
{
TExpression iexp = EvaluateInteger(assignaux.index);
Assign(assignaux.Var, GiveIntWithRuntimeError(Math.Truncate(iexp.ValNB)), exp0);
Free(ref iexp);
}
Free(ref exp0);
}
else if (linst.Ins is TWrite)
{
TWrite writeAux = linst.Ins as TWrite;
TExpression exp = EvaluateExpression(writeAux.exp);
string output = "";
while (exp != null)
{
if (exp.UL == TypeSymbol.U_True)
{
output += true.ToString();
}
else if (exp.UL == TypeSymbol.U_False)
{
output += false.ToString();
}
else if (exp.UL == TypeSymbol.U_Cst_Str)
{
output += exp.ValStr;
}
else if (exp.UL == TypeSymbol.U_Cst_Real || exp.UL == TypeSymbol.U_Cst_Int)
{
output += exp.ValNB.ToString();
}
exp = exp.Next;
}
WriteEvent?.Invoke(this, new WriteEventArgs(writeAux.isLn, output, false));
Free(ref exp);
}
else if (linst.Ins is ReadInstruction)
{
ReadInstruction readAux = linst.Ins as ReadInstruction;
InputForm inputRead = new InputForm();
inputRead.ShowDialog();
string result = inputRead.Input;
TExpression expAux = new TExpression {
UL = TypeSymbol.U_Cst_Str, ValStr = result
};
try
{
expAux.ValNB = Convert.ToDouble(result);
expAux.UL = IsIntMethod(expAux.ValNB);
expAux.ValStr = "";
}
catch (FormatException)
{
}
try
{
expAux.UL = (Convert.ToBoolean(result) ? TypeSymbol.U_True : TypeSymbol.U_False);
expAux.ValStr = "";
}
catch (FormatException)
{
}
int index = 0;
if (readAux.index != null)
{
TExpression temp = EvaluateInteger(readAux.index);
index = GiveIntWithRuntimeError(Math.Truncate(temp.ValNB));
Free(ref temp);
}
Assign(readAux.V, index, expAux);
}
else
{
GetRuntimeError(RuntimeMessagesError.UnknownInstruction);
}
linst = linst.Next;
}
return(TypeSymbol.U_EOF);
}