public void SetType(int id, SimpleScriptTypes type)
{
if (!symbolTable.ContainsKey(id))
{
throw new ArgumentException("Undeclared identifier.");
}
SymbolTableElement x = symbolTable[id];
switch (type)
{
case SimpleScriptTypes.Integer:
SymbolTableIntegerElement stie = new SymbolTableIntegerElement(x.Name, 0);
symbolTable[id] = stie;
break;
case SimpleScriptTypes.Double:
SymbolTableDoubleElement stde = new SymbolTableDoubleElement(x.Name, 0.0);
symbolTable[id] = stde;
break;
case SimpleScriptTypes.Boolean:
SymbolTableBoolElement stbe = new SymbolTableBoolElement(x.Name, false);
symbolTable[id] = stbe;
break;
case SimpleScriptTypes.String:
SymbolTableStringElement stse = new SymbolTableStringElement(x.Name, "");
symbolTable[id] = stse;
break;
}
}
public Expression(SymbolTableElement elem)
{
if (elem == null)
{
throw new ArgumentNullException("elem");
}
this.operation = Operation.SymbolElement;
this.element = elem;
if (elem is SymbolTableIntegerElement)
{
type = SimpleScriptTypes.Integer;
}
if (elem is SymbolTableBoolElement)
{
type = SimpleScriptTypes.Boolean;
}
if (elem is SymbolTableDoubleElement)
{
type = SimpleScriptTypes.Double;
}
if (elem is SymbolTableStringElement)
{
type = SimpleScriptTypes.String;
}
element = elem;
}
public string Print()
{
StringBuilder result = new StringBuilder("Dim ");
SymbolTableElement ste = SymbolTable.GetInstance.Get(symbolId);
result.Append(ste.Name);
result.Append(" as ");
if (ste is SymbolTableIntegerElement)
{
result.Append("integer");
}
if (ste is SymbolTableDoubleElement)
{
result.Append("double");
}
if (ste is SymbolTableStringElement)
{
result.Append("string");
}
if (ste is SymbolTableBoolElement)
{
result.Append("bool");
}
return(result.ToString());
}
public void Execute()
{
SymbolTableElement st = SymbolTable.GetInstance.Get(symbolId);
if (st is SymbolTableIntegerElement)
{
int value = Convert.ToInt32(Console.ReadLine());
SymbolTableIntegerElement ist = st as SymbolTableIntegerElement;
ist.Value = value;
return;
}
if (st is SymbolTableBoolElement)
{
bool value = Convert.ToBoolean(Console.ReadLine());
SymbolTableBoolElement bst = st as SymbolTableBoolElement;
bst.Value = value;
return;
}
if (st is SymbolTableDoubleElement)
{
double value = Convert.ToDouble(Console.ReadLine());
SymbolTableDoubleElement dst = st as SymbolTableDoubleElement;
dst.Value = value;
return;
}
if (st is SymbolTableStringElement)
{
string value = Console.ReadLine();
SymbolTableStringElement sst = st as SymbolTableStringElement;
sst.Value = value;
return;
}
}
public string Print()
{
string result = "input ";
SymbolTableElement ste = SymbolTable.GetInstance.Get(symbolId);
return(result + ste.Name);
}
public void Execute()
{
SymbolTableElement elem = SymbolTable.GetInstance.Get(id);
if (elem is SymbolTableIntegerElement)
{
SymbolTableIntegerElement ielem = (SymbolTableIntegerElement)elem;
if (exp.Type == SimpleScriptTypes.Integer)
{
ielem.Value = (long)exp.Evaluate();
}
else
{
throw new InvalidOperationException("Invalide assignment.");
}
return;
}
if (elem is SymbolTableBoolElement)
{
SymbolTableBoolElement belem = (SymbolTableBoolElement)elem;
if (exp.Type == SimpleScriptTypes.Boolean)
{
belem.Value = (bool)exp.Evaluate();
}
else
{
throw new InvalidOperationException("Invalide assignment.");
}
return;
}
if (elem is SymbolTableDoubleElement)
{
SymbolTableDoubleElement delem = (SymbolTableDoubleElement)elem;
if (exp.Type == SimpleScriptTypes.Double || exp.Type == SimpleScriptTypes.Integer)
{
delem.Value = (double)exp.Evaluate();
}
else
{
throw new InvalidOperationException("Invalide assignment.");
}
}
if (elem is SymbolTableStringElement)
{
SymbolTableStringElement selem = (SymbolTableStringElement)elem;
if (exp.Type == SimpleScriptTypes.Double)
{
selem.Value = exp.Evaluate().ToString();
}
else
{
throw new InvalidOperationException("Invalide assignment.");
}
}
}
public int Add(string name)
{
if (string.IsNullOrEmpty(name))
{
throw new ArgumentException();
}
name = name.ToUpper();
if (symbolNames.ContainsKey(name))
{
throw new ApplicationException("Variable with name " + name + "has been already defined");
}
SymbolTableElement x = new SymbolTableElement(name);
symbolTable.Add(counter, x);
symbolNames.Add(name, counter);
++counter;
return(counter - 1);
}
