public Expression Process(ParameterExpression ctxExpression, Type parameterType)
{
var leftExpression = ctxExpression.EvaluateExpression(Left, false);
leftExpression = leftExpression.AddToStringWithEnumType();
if (Operator != Operator.IsNull && Operator != Operator.NotIsNull)
{
leftExpression = leftExpression.AddValueWithNullableNumberType();
}
var leftSideType = leftExpression.Type;
Expression rightExpression;
if (RightSideIsExpression)
{
rightExpression = ctxExpression.EvaluateExpression(Right);
rightExpression = rightExpression.AddToStringWithEnumType().AddValueWithNullableNumberType();
}
else
{
rightExpression = GetRightConstantExpression(leftSideType);
}
Expression generatedExpression;
switch (Operator)
{
case Operator.Equals:
generatedExpression = Expression.Equal(leftExpression, rightExpression);
break;
case Operator.NotEquals:
generatedExpression = Expression.Not(Expression.Equal(leftExpression, rightExpression));
break;
case Operator.GreaterThan:
generatedExpression = leftExpression.Type == typeof(DateTime)
? Expression.MakeBinary(ExpressionType.GreaterThan, leftExpression, rightExpression)
: Expression.GreaterThan(leftExpression, rightExpression);
break;
case Operator.GreaterOrEqual:
generatedExpression = leftExpression.Type == typeof(DateTime)
? Expression.MakeBinary(ExpressionType.GreaterThanOrEqual, leftExpression, rightExpression)
: Expression.GreaterThanOrEqual(leftExpression, rightExpression);
break;
case Operator.LessThan:
generatedExpression = leftExpression.Type == typeof(DateTime)
? Expression.MakeBinary(ExpressionType.LessThan, leftExpression, rightExpression)
: Expression.LessThan(leftExpression, rightExpression);
break;
case Operator.LessOrEqual:
generatedExpression = leftExpression.Type == typeof(DateTime)
? Expression.MakeBinary(ExpressionType.LessThanOrEqual, leftExpression, rightExpression)
: Expression.LessThanOrEqual(leftExpression, rightExpression);
break;
case Operator.Contains:
generatedExpression = new Contains(leftExpression, rightExpression).Create();
break;
case Operator.NotContains:
generatedExpression = Expression.Not(new Contains(leftExpression, rightExpression).Create());
break;
case Operator.ContainsAll:
generatedExpression = new ContainsAll(leftExpression, rightExpression).Create();
break;
case Operator.NotContainsAll:
generatedExpression = Expression.Not(new ContainsAll(leftExpression, rightExpression).Create());
break;
case Operator.StartsWith:
generatedExpression = new StartsWith(leftExpression, rightExpression).Create();
break;
case Operator.NotStartsWith:
generatedExpression = Expression.Not(new StartsWith(leftExpression, rightExpression).Create());
break;
case Operator.In:
generatedExpression = new In(leftExpression, rightExpression).Create();
break;
case Operator.NotIn:
generatedExpression = Expression.Not(new In(leftExpression, rightExpression).Create());
break;
case Operator.AllIn:
generatedExpression = new AllIn(leftExpression, rightExpression).Create();
break;
case Operator.NotAllIn:
generatedExpression = Expression.Not(new AllIn(leftExpression, rightExpression).Create());
break;
case Operator.AnyIn:
generatedExpression = new AnyIn(leftExpression, rightExpression).Create();
break;
case Operator.NotAnyIn:
generatedExpression = Expression.Not(new AnyIn(leftExpression, rightExpression).Create());
break;
case Operator.IsNull:
if (leftSideType.IsPrimitiveType() && Nullable.GetUnderlyingType(leftSideType) != null)
{
rightExpression = Expression.Constant(null, leftSideType);
}
generatedExpression = Expression.Equal(leftExpression, rightExpression);
break;
case Operator.NotIsNull:
if (leftSideType.IsPrimitiveType() && Nullable.GetUnderlyingType(leftSideType) != null)
{
rightExpression = Expression.Constant(null, leftSideType);
}
generatedExpression = Expression.Not(Expression.Equal(leftExpression, rightExpression));
break;
case Operator.IsEmpty:
generatedExpression = new IsEmpty(leftExpression, rightExpression).Create();
break;
case Operator.NotIsEmpty:
generatedExpression = Expression.Not(new IsEmpty(leftExpression, rightExpression).Create());
break;
case Operator.DiffWithinPct:
generatedExpression = new DiffWithinPct(leftExpression, rightExpression, OperatorArgs).Create();
break;
case Operator.AllInRangePct:
generatedExpression = new AllInRange(leftExpression, rightExpression, OperatorArgs).Create();
break;
default:
throw new NotSupportedException($"operation {Operator} is not supported");
}
if (Operator == Operator.IsNull || Operator == Operator.NotIsNull)
{
return(generatedExpression);
}
return(leftExpression.AddNotNullCheck(out var nullCheckExpression)
? Expression.AndAlso(nullCheckExpression, generatedExpression)
: generatedExpression);
}