public Operation(MathsExpression left, MathsExpression right, char @operator) => (Left, Right, Operator) = (left, right, @operator);
public void Visit(MathsExpression maths)
{
object leftVal = null;
object rightVal = null;
SailType resultType = SailType.UNKNOWN;
// Left
if (maths.Left is IntLiteralExpression)
{
leftVal = ((IntLiteralExpression)maths.Left).Value;
resultType = SailType.INT;
}
else if (maths.Left is FloatLiteralExpression)
{
leftVal = ((FloatLiteralExpression)maths.Left).Value;
resultType = SailType.FLOAT;
}
else if (maths.Left is IdentifierExpression)
{
string name = ((IdentifierExpression)maths.Left).Value;
var variable = _variables.FirstOrDefault(v => v.Name == name);
if (variable == null)
{
ErrorManager.CreateError("Can't compare non-existant variable!", ErrorType.Error, maths.Left.Line, maths.Left.Column);
return;
}
if (variable.Value == null)
{
ErrorManager.CreateError("Can't compare null valued variable!", ErrorType.Error, maths.Left.Line, maths.Left.Column);
return;
}
leftVal = variable.Value;
resultType = variable.Type;
}
else if (maths.Left is MathsExpression)
{
Visit(maths.Left);
var mathsValue = _mathsResults.Pop();
rightVal = mathsValue.Value;
resultType = mathsValue.Type;
}
// Right
if (maths.Right is IntLiteralExpression)
{
rightVal = ((IntLiteralExpression)maths.Right).Value;
resultType = SailType.INT;
}
else if (maths.Right is FloatLiteralExpression)
{
rightVal = ((FloatLiteralExpression)maths.Right).Value;
resultType = SailType.FLOAT;
}
else if (maths.Right is IdentifierExpression)
{
string name = ((IdentifierExpression)maths.Right).Value;
var variable = _variables.FirstOrDefault(v => v.Name == name);
if (variable == null)
{
ErrorManager.CreateError("Can't compare non-existant variable!", ErrorType.Error, maths.Right.Line, maths.Right.Column);
return;
}
if (variable.Value == null)
{
ErrorManager.CreateError("Can't compare null valued variable!", ErrorType.Error, maths.Right.Line, maths.Right.Column);
return;
}
rightVal = variable.Value;
resultType = variable.Type;
}
else if (maths.Right is MathsExpression)
{
Visit(maths.Right);
var mathsValue = _mathsResults.Pop();
rightVal = mathsValue.Value;
resultType = mathsValue.Type;
}
object value = null;
switch (maths.OperatorType)
{
case TokenType.PLUS:
value = Convert.ToSingle(leftVal) + Convert.ToSingle(rightVal);
break;
case TokenType.MINUS:
value = Convert.ToSingle(leftVal) - Convert.ToSingle(rightVal);
break;
case TokenType.ASTERISK:
value = Convert.ToSingle(leftVal) * Convert.ToSingle(rightVal);
break;
case TokenType.FSLASH:
value = Convert.ToSingle(leftVal) / Convert.ToSingle(rightVal);
break;
case TokenType.MODULO:
value = Convert.ToSingle(leftVal) % Convert.ToSingle(rightVal);
break;
}
_mathsResults.Push(new SailObject(null, value, resultType));
}
