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Merge pull request #17 from zadykian/fix/comparison-macros
Comparison Macros
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| using System; | ||
| using System.Linq; | ||
| using System.Reflection; | ||
| // ReSharper disable SuggestBaseTypeForParameter | ||
|
|
||
| namespace sdmap.Macros.Implements; | ||
|
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| public enum ComparisonResult : byte | ||
| { | ||
| Incomparable = 1, | ||
| AreEqual, | ||
| LeftIsGreater, | ||
| LeftIsLess | ||
| } | ||
|
|
||
| internal static class ValueComparer | ||
| { | ||
| public static ComparisonResult Compare(object left, object right) | ||
| => CompareImpl(left, right) switch | ||
| { | ||
| null => ComparisonResult.Incomparable, | ||
| 0 => ComparisonResult.AreEqual, | ||
| > 0 => ComparisonResult.LeftIsGreater, | ||
| < 0 => ComparisonResult.LeftIsLess | ||
| }; | ||
|
|
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| private static int? CompareImpl(object left, object right) | ||
| => left switch | ||
| { | ||
| null => right is null ? 0 : null, | ||
| not null when right is null => null, | ||
|
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| byte byteValue => byteValue.CompareTo(Convert.ToByte(right)), | ||
| sbyte sByteValue => sByteValue.CompareTo(Convert.ToSByte(right)), | ||
| short shortValue => shortValue.CompareTo(Convert.ToInt16(right)), | ||
| ushort ushortValue => ushortValue.CompareTo(Convert.ToUInt16(right)), | ||
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| int intValue => intValue.CompareTo(Convert.ToInt32(right)), | ||
| uint uIntValue => uIntValue.CompareTo(Convert.ToUInt32(right)), | ||
| long longValue => longValue.CompareTo(Convert.ToInt64(right)), | ||
| ulong uLongValue => uLongValue.CompareTo(Convert.ToUInt64(right)), | ||
|
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| float floatValue => floatValue.CompareTo(Convert.ToSingle(right)), | ||
| double doubleValue => doubleValue.CompareTo(Convert.ToDouble(right)), | ||
| decimal decimalValue => decimalValue.CompareTo(Convert.ToDecimal(right)), | ||
|
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| Enum enumValue => Compare(enumValue, right), | ||
| IComparable comparable => Compare(comparable, right), | ||
|
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| _ => null | ||
| }; | ||
|
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| private static int? Compare(Enum leftEnum, object right) | ||
| { | ||
| if (right is Enum rightEnum) | ||
| { | ||
| return leftEnum.GetType() == rightEnum.GetType() | ||
| ? leftEnum.CompareTo(rightEnum) | ||
| : null; | ||
| } | ||
|
|
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| return EnumParser.TryParse(leftEnum.GetType(), right.ToString(), out var parsed) | ||
| ? leftEnum.CompareTo(parsed) | ||
| : null; | ||
| } | ||
|
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| private static int? Compare(IComparable comparable, object right) | ||
| { | ||
| var leftType = comparable.GetType(); | ||
|
|
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| if (leftType == right.GetType()) | ||
| { | ||
| return comparable.CompareTo(right); | ||
| } | ||
|
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| return TryParse(leftType, right.ToString(), out var parsed) | ||
| ? comparable.CompareTo(parsed) | ||
| : null; | ||
|
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| static bool TryParse(Type targetType, string input, out object parsed) | ||
| { | ||
| if (targetType == typeof(Guid)) | ||
| { | ||
| var result = Guid.TryParse(input, out var parsedValue); | ||
| parsed = parsedValue; | ||
| return result; | ||
| } | ||
|
|
||
| if (targetType == typeof(TimeSpan)) | ||
| { | ||
| var result = TimeSpan.TryParse(input, out var parsedValue); | ||
| parsed = parsedValue; | ||
| return result; | ||
| } | ||
|
|
||
| if (targetType == typeof(DateTime)) | ||
| { | ||
| var result = DateTime.TryParse(input, out var parsedValue); | ||
| parsed = parsedValue; | ||
| return result; | ||
| } | ||
|
|
||
| if (targetType == typeof(DateTimeOffset)) | ||
| { | ||
| var result = DateTimeOffset.TryParse(input, out var parsedValue); | ||
| parsed = parsedValue; | ||
| return result; | ||
| } | ||
|
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| parsed = null; | ||
| return false; | ||
| } | ||
| } | ||
|
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| private static class EnumParser | ||
| { | ||
| private static readonly MethodInfo TryParseMethod | ||
| = typeof(Enum) | ||
| .GetMethods(BindingFlags.Public | BindingFlags.Static) | ||
| .Single(method => | ||
| method.Name == nameof(Enum.TryParse) | ||
| && method.IsGenericMethodDefinition | ||
| && method.ReturnType == typeof(bool) | ||
| && method.GetParameters().Length == 3 | ||
| && method.GetParameters().First().ParameterType == typeof(string) | ||
| ); | ||
|
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| public static bool TryParse(Type enumType, string value, out object parsed) | ||
| { | ||
| var parameters = new object[] { value, true, null }; | ||
|
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| var result = TryParseMethod | ||
| .MakeGenericMethod(enumType) | ||
| .Invoke(obj: null, parameters); | ||
|
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| parsed = parameters[2]; | ||
| return (bool)result; | ||
| } | ||
| } | ||
| } |
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