private Exp addNewExp()
{
Console.WriteLine("Choose a type of expression:");
Console.WriteLine("1. Arithmetical expression");
Console.WriteLine("2. Constant expression");
Console.WriteLine("3. Variable expression");
Console.WriteLine("4. Comparison expression");
Console.WriteLine("5. Logical expression");
Console.WriteLine("6. Read expression");
Console.WriteLine("7. Read heap expression");
int opt = Convert.ToInt32(Console.ReadLine());
Exp expr;
switch (opt)
{
case 1:
Console.WriteLine("Choose operation: +, -, *, /");
String op = Console.ReadLine();
List <string> optionList = new List <string>
{
"+", "-", "*", "/"
};
if (optionList.Contains(op))
{
Console.WriteLine("Left hand side:");
Exp left = addNewExp();
Console.WriteLine("Right hand side:");
Exp right = addNewExp();
expr = new ArithmExp(left, right, op[0]);
}
else
{
Console.WriteLine("Operand MUST be +, -, *, /. Try again");
expr = addNewExp();
}
break;
case 2:
Console.WriteLine("Give a number:");
int no = Convert.ToInt32(Console.ReadLine());
expr = new ConstExp(no);
break;
case 3:
Console.WriteLine("Variable name:");
String varName = Console.ReadLine();
expr = new VarExp(varName);
break;
case 4:
Console.WriteLine("Choose comp. operand: <, <=, ==, !=, >=, >");
String op1 = Console.ReadLine();
List <string> optsList = new List <string>
{
"<", "<=", "==", "!=", ">=", ">"
};
if (optsList.Contains(op1))
{
Console.WriteLine("Left hand side:");
Exp left = addNewExp();
Console.WriteLine("Right hand side:");
Exp right = addNewExp();
expr = new CompExp(left, right, op1);
}
else
{
Console.WriteLine("Operand MUST be a comp. operator. Try again");
expr = addNewExp();
}
break;
case 5:
Console.WriteLine("Choose logical operand: && (and), ||(or), !(not)");
String op2 = Console.ReadLine();
List <string> optionsList = new List <string>
{
"&&", "||"
};
if (optionsList.Contains(op2))
{
Console.WriteLine("Left hand side:");
Exp left = addNewExp();
Console.WriteLine("Right hand side:");
Exp right = addNewExp();
expr = new LogicExp(left, right, op2);
}
else if (op2 == "!")
{
Console.WriteLine("Expression:");
Exp singleExp = addNewExp();
expr = new LogicExp(singleExp, op2);
}
else
{
Console.WriteLine("Operand MUST be a logical operator. Try again");
expr = addNewExp();
}
break;
case 6:
expr = new ReadExp();
break;
case 7:
Console.WriteLine("Variable name:");
String varNew = Console.ReadLine();
expr = new ReadHeapExp(varNew);
break;
default:
Console.WriteLine("Please try one of the options above.");
expr = addNewExp();
break;
}
return(expr);
}
private Exp addNewExp()
{
Console.WriteLine("Choose a type of expression:");
Console.WriteLine("1. Arithmetical expression");
Console.WriteLine("2. Constant expression");
Console.WriteLine("3. Variable expression");
Console.WriteLine("4. Comparison expression");
Console.WriteLine("5. Logical expression");
Console.WriteLine("6. Read expression");
Console.WriteLine("7. Read heap expression");
int opt = Convert.ToInt32(Console.ReadLine());
Exp expr;
switch (opt) {
case 1:
Console.WriteLine ("Choose operation: +, -, *, /");
String op = Console.ReadLine ();
List<string> optionList = new List<string>
{ "+", "-", "*", "/"};
if (optionList.Contains(op)) {
Console.WriteLine("Left hand side:");
Exp left = addNewExp();
Console.WriteLine("Right hand side:");
Exp right = addNewExp();
expr = new ArithmExp(left, right, op[0]);
} else {
Console.WriteLine("Operand MUST be +, -, *, /. Try again");
expr = addNewExp();
}
break;
case 2:
Console.WriteLine("Give a number:");
int no = Convert.ToInt32(Console.ReadLine());
expr = new ConstExp(no);
break;
case 3:
Console.WriteLine("Variable name:");
String varName = Console.ReadLine ();
expr = new VarExp(varName);
break;
case 4:
Console.WriteLine("Choose comp. operand: <, <=, ==, !=, >=, >");
String op1 = Console.ReadLine ();
List<string> optsList = new List<string>
{"<", "<=", "==", "!=", ">=", ">"};
if (optsList.Contains(op1)) {
Console.WriteLine("Left hand side:");
Exp left = addNewExp();
Console.WriteLine("Right hand side:");
Exp right = addNewExp();
expr = new CompExp(left, right, op1);
} else {
Console.WriteLine("Operand MUST be a comp. operator. Try again");
expr = addNewExp();
}
break;
case 5:
Console.WriteLine("Choose logical operand: && (and), ||(or), !(not)");
String op2 = Console.ReadLine ();
List<string> optionsList = new List<string>
{"&&", "||"};
if (optionsList.Contains(op2)) {
Console.WriteLine("Left hand side:");
Exp left = addNewExp();
Console.WriteLine("Right hand side:");
Exp right = addNewExp();
expr = new LogicExp(left, right, op2);
} else if(op2 == "!") {
Console.WriteLine("Expression:");
Exp singleExp = addNewExp();
expr = new LogicExp(singleExp, op2);
} else {
Console.WriteLine("Operand MUST be a logical operator. Try again");
expr = addNewExp();
}
break;
case 6:
expr = new ReadExp();
break;
case 7:
Console.WriteLine ("Variable name:");
String varNew = Console.ReadLine ();
expr = new ReadHeapExp(varNew);
break;
default:
Console.WriteLine("Please try one of the options above.");
expr = addNewExp();
break;
}
return expr;
}
