private static BasicExpression Type(BasicExpression x, BasicType expected)
{
if (x.Type != expected)
{
string error = string.Format(
CultureInfo.InvariantCulture,
"Type mismatch; expected [{0}] to be of type {1} but was of type {2}.",
x,
expected,
x.Type);
throw new ParseException(error);
}
return(x);
}
private BasicType CheckType(BasicExpression x, BasicExpression y)
{
if (x.Type != y.Type)
{
string error = string.Format(
CultureInfo.InvariantCulture,
"Type mismatch for operator '{0}'; Type of [{1}] is {2} while type of [{3}] is {4}.",
this.name,
x,
x.Type,
y,
y.Type);
throw new ParseException(error);
}
BasicType result = this.type;
if (result == BasicType.None)
{
result = x.Type;
}
return(result);
}
public BasicExpression Apply(BasicExpression x, BasicExpression y)
{
BasicType result = this.CheckType(x, y);
return(BasicOperator.Binary(this.name, result, x, y));
}
public static BasicExpression Apply(IOperator op, BasicExpression x, BasicExpression y)
{
return(op.Apply(x, y));
}
public static BasicExpression Num(BasicExpression x) => Type(x, BasicType.Num);
public static BasicExpression Str(BasicExpression x) => Type(x, BasicType.Str);