//Evaluate a check into a raw boolean (no value wrapper).
public override object VisitCheck([NotNull] algoParser.CheckContext context)
{
//Switch for the type of check.
if (context.BIN_AND() != null)
{
//Binary AND.
//Evaluate the left and right values.
AlgoValue left = (AlgoValue)VisitCheck(context.check());
AlgoValue right = (AlgoValue)VisitCheckfrag(context.checkfrag());
//Return the comparison result of these two (as AlgoValue).
return(new AlgoValue()
{
Type = AlgoValueType.Boolean,
Value = AlgoComparators.AND(context, left, right),
});
}
else if (context.BIN_OR() != null)
{
//Binary OR.
//Evaluate the left and right values.
AlgoValue left = (AlgoValue)VisitCheck(context.check());
AlgoValue right = (AlgoValue)VisitCheckfrag(context.checkfrag());
//Return an OR on these values.
return(new AlgoValue()
{
Type = AlgoValueType.Boolean,
Value = AlgoComparators.OR(context, left, right),
});
}
else if (context.LBRACKET() != null)
{
//Bracketed check.
return((AlgoValue)VisitCheck(context.check()));
}
else if (context.INVERT_SYM() != null)
{
//Boolean invert.
AlgoValue evaled = (AlgoValue)VisitCheck(context.check());
//Get the boolean value for the evaluated value.
bool evaledBool = AlgoComparators.GetBooleanValue(evaled, context);
//Return the inverted bool.
return(new AlgoValue()
{
Type = AlgoValueType.Boolean,
Value = !evaledBool,
});
}
else
{
//Just a checkfrag. Evaluate and return.
return((AlgoValue)VisitCheckfrag(context.checkfrag()));
}
}
//Override for checking whether AlgoValues are equal.
public bool _Equals(AlgoValue obj)
{
//Check if value types are the same.
if (Type != obj.Type)
{
//No.
return(false);
}
//Are the actual values themselves the same?
var objVal = obj.Value;
switch (Type)
{
case AlgoValueType.String:
return((string)Value == (string)objVal);
case AlgoValueType.Boolean:
return((bool)Value == (bool)objVal);
case AlgoValueType.Float:
return(((BigFloat)Value).Equals((BigFloat)objVal));
case AlgoValueType.Integer:
return(((BigInteger)Value).Equals((BigInteger)objVal));
case AlgoValueType.List:
return(AlgoComparators.ListsEqual(this, obj));
case AlgoValueType.Null:
return(true);
case AlgoValueType.Object:
return(AlgoComparators.ObjectsEqual(this, obj));
case AlgoValueType.Rational:
return(((BigRational)Value).Equals((BigRational)objVal));
default:
Error.FatalNoContext("Cannot compare whether two " + Type.ToString() + " values are equal.");
return(false);
}
}
//Evaluate the check fragment for the full check.
public override object VisitCheckfrag([NotNull] algoParser.CheckfragContext context)
{
//Evaluate the expressions on the left and right, depending on the operator.
if (context.GRTR_THAN() != null)
{
// Binary greater than.
//Evaluate both the expressions.
AlgoValue left = (AlgoValue)VisitExpr(context.expr()[0]);
AlgoValue right = (AlgoValue)VisitExpr(context.expr()[1]);
return(new AlgoValue()
{
Type = AlgoValueType.Boolean,
Value = AlgoComparators.GreaterThan(context, left, right, false),
});
}
else if (context.GRTR_THAN_ET() != null)
{
// Binary greater than or equal to.
//Evaluate both the expressions.
AlgoValue left = (AlgoValue)VisitExpr(context.expr()[0]);
AlgoValue right = (AlgoValue)VisitExpr(context.expr()[1]);
return(new AlgoValue()
{
Type = AlgoValueType.Boolean,
Value = AlgoComparators.GreaterThan(context, left, right, true),
});
}
else if (context.LESS_THAN() != null)
{
// Binary less than.
//Evaluate both the expressions.
AlgoValue left = (AlgoValue)VisitExpr(context.expr()[0]);
AlgoValue right = (AlgoValue)VisitExpr(context.expr()[1]);
return(new AlgoValue()
{
Type = AlgoValueType.Boolean,
Value = AlgoComparators.LessThan(context, left, right, false),
});
}
else if (context.LESS_THAN_ET() != null)
{
// Binary less than or equal to.
//Evaluate both the expressions.
AlgoValue left = (AlgoValue)VisitExpr(context.expr()[0]);
AlgoValue right = (AlgoValue)VisitExpr(context.expr()[1]);
return(new AlgoValue()
{
Type = AlgoValueType.Boolean,
Value = AlgoComparators.LessThan(context, left, right, true),
});
}
else if (context.BIN_EQUALS() != null)
{
//Binary EQUALS.
//Evaluate the left and right values.
AlgoValue left = (AlgoValue)VisitExpr(context.expr()[0]);
AlgoValue right = (AlgoValue)VisitExpr(context.expr()[1]);
//Return whether these two are equal, as AlgoValue.
return(new AlgoValue()
{
Type = AlgoValueType.Boolean,
Value = AlgoComparators._Equals(context, left, right),
});
}
else if (context.BIN_NET() != null)
{
//Binary not equal to.
//Evaluate the left and right values.
AlgoValue left = (AlgoValue)VisitExpr(context.expr()[0]);
AlgoValue right = (AlgoValue)VisitExpr(context.expr()[1]);
//Return whether these two are equal, as AlgoValue.
return(new AlgoValue()
{
Type = AlgoValueType.Boolean,
Value = !AlgoComparators._Equals(context, left, right),
});
}
else
{
//Only a single value, so evaluate and return.
return((AlgoValue)VisitExpr(context.expr()[0]));
}
}
//An "if" statement.
public override object VisitStat_if([NotNull] algoParser.Stat_ifContext context)
{
//Evaluate the check.
AlgoValue checkReturned = (AlgoValue)VisitCheck(context.check());
bool mainCheck = AlgoComparators.GetBooleanValue(checkReturned, context);
//Did it pass? If so, eval the if.
if (mainCheck)
{
//Create scope.
Scopes.AddScope();
//Evaluate the main statement body.
foreach (var statement in context.statement())
{
AlgoValue returned = (AlgoValue)VisitStatement(statement);
if (returned != null)
{
Scopes.RemoveScope();
return(returned);
}
}
//Delete scope.
Scopes.RemoveScope();
//Return.
return(null);
}
//Maincheck failed, complete all the "else if" checks if they exist.
if (context.stat_elif().Length != 0)
{
foreach (var elseifblock in context.stat_elif())
{
//Does the check pass?
var checkContext = elseifblock.check();
AlgoValue elifCheckReturned = (AlgoValue)VisitCheck(checkContext);
bool elseifCheck = AlgoComparators.GetBooleanValue(elifCheckReturned, context);
if (elseifCheck)
{
//Create scope.
Scopes.AddScope();
//Evaluate statements.
foreach (var statement in elseifblock.statement())
{
AlgoValue returned = (AlgoValue)VisitStatement(statement);
if (returned != null)
{
Scopes.RemoveScope();
return(returned);
}
}
//Remove scope.
Scopes.RemoveScope();
//Return.
return(null);
}
}
}
//Is there an else?
if (context.stat_else() != null)
{
//Create a scope.
Scopes.AddScope();
//Evaluate statements.
foreach (var statement in context.stat_else().statement())
{
AlgoValue returned = (AlgoValue)VisitStatement(statement);
if (returned != null)
{
Scopes.RemoveScope();
return(returned);
}
}
//Deleting scope.
Scopes.RemoveScope();
}
//Returning.
return(null);
}
