/**
* Function VisitIdentExpr : it checks if the variable exists in
* the table (previous declared) and returns its value.
* Otherwise it throws an error cause it was not declared
* Param : identifier expression to check
* Return : the type of the identifier
*/
public VALTYPE VisitIdentExpr(Expr.Ident expr)
{
if (SymbleTypeTable.ContainsKey(expr.Name.Text))
{
return(SymbleTypeTable[expr.Name.Text]);
}
else
{
throw new TypeError(expr.Name, expr.Name.Text + " got referenced before it was declared.");
}
}
/**
* Function VisitIdentExpr
* Param : identifier expression to visit
* Return : text if environment is null or the value inside the environment
*/
public string VisitIdentExpr(Expr.Ident expr)
{
if (Environment == null)
{
return(expr.Name.Text);
}
else
{
return(expr.Name.Text + "(=" + Environment[expr.Name.Text].Val.ToString() + ")");
}
}
/**
* Function VisitIdentExpr : it evaluates an identifier expression
* Param : identifier expression to evaluate
* Return : the value of the identifier in the symble table or
* throws an error if the var was not previous declared
*/
public Value VisitIdentExpr(Expr.Ident expr)
{
String name = expr.Name.Text;
if (SymbleTable.ContainsKey(name))
{
Value value = SymbleTable[name];
if (value.Val == null)
{
throw new RuntimeError(expr.Name, name + " is not initialized.");
}
return(SymbleTable[name]);
}
else
{
throw new RuntimeError(expr.Name, "Not declared variable.");
}
}