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184 lines
8.1 KiB
184 lines
8.1 KiB
using IPA.Config.Stores.Attributes;
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using IPA.Logging;
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using IPA.Utilities;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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using System.Threading.Tasks;
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namespace IPA.Config.Stores
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{
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internal static partial class GeneratedStoreImpl
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{
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private class SerializedMemberInfo
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{
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public string Name;
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public MemberInfo Member;
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public Type Type;
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public bool AllowNull;
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public bool IsVirtual;
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public bool IsField;
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public bool IsNullable; // signifies whether this is a Nullable<T>
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public bool HasConverter;
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public bool IsGenericConverter; // used so we can call directly to the generic version if it is
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public Type Converter;
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public Type ConverterBase;
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public Type ConverterTarget;
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public FieldInfo ConverterField;
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// invalid for objects with IsNullabe false
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public Type NullableWrappedType => Nullable.GetUnderlyingType(Type);
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// invalid for objects with IsNullabe false
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public PropertyInfo Nullable_HasValue => Type.GetProperty(nameof(Nullable<int>.HasValue));
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// invalid for objects with IsNullabe false
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public PropertyInfo Nullable_Value => Type.GetProperty(nameof(Nullable<int>.Value));
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// invalid for objects with IsNullabe false
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public ConstructorInfo Nullable_Construct => Type.GetConstructor(new[] { NullableWrappedType });
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public Type ConversionType => IsNullable ? NullableWrappedType : Type;
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}
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private static bool IsMethodInvalid(MethodInfo m, Type ret) => !m.IsVirtual || m.ReturnType != ret;
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private static bool ProcessAttributesFor(Type type, ref SerializedMemberInfo member)
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{
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var attrs = member.Member.GetCustomAttributes(true);
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var ignores = attrs.Select(o => o as IgnoreAttribute).NonNull();
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if (ignores.Any() || typeof(Delegate).IsAssignableFrom(member.Type))
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{ // we ignore delegates completely because there is no a good way to serialize them
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return false;
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}
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var nonNullables = attrs.Select(o => o as NonNullableAttribute).NonNull();
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member.Name = member.Member.Name;
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member.IsNullable = member.Type.IsGenericType
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&& member.Type.GetGenericTypeDefinition() == typeof(Nullable<>);
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member.AllowNull = !nonNullables.Any() && (!member.Type.IsValueType || member.IsNullable);
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var nameAttr = attrs.Select(o => o as SerializedNameAttribute).NonNull().FirstOrDefault();
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if (nameAttr != null)
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member.Name = nameAttr.Name;
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member.HasConverter = false;
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var converterAttr = attrs.Select(o => o as UseConverterAttribute).NonNull().FirstOrDefault();
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if (converterAttr != null)
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{
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member.Converter = converterAttr.ConverterType;
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member.IsGenericConverter = converterAttr.IsGenericConverter;
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if (member.Converter.GetConstructor(Type.EmptyTypes) == null)
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{
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Logger.config.Warn($"{type.FullName}'s member {member.Member.Name} requests a converter that is not default-constructible");
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goto endConverterAttr; // is there a better control flow structure to do this?
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}
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if (member.Converter.ContainsGenericParameters)
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{
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Logger.config.Warn($"{type.FullName}'s member {member.Member.Name} requests a converter that has unfilled type parameters");
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goto endConverterAttr;
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}
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if (member.Converter.IsInterface || member.Converter.IsAbstract)
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{
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Logger.config.Warn($"{type.FullName}'s member {member.Member.Name} requests a converter that is not constructible");
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goto endConverterAttr;
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}
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var targetType = converterAttr.ConverterTargetType;
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if (!member.IsGenericConverter)
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{
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try
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{
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var conv = Activator.CreateInstance(converterAttr.ConverterType) as IValueConverter;
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targetType = conv.Type;
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}
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catch
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{
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Logger.config.Warn($"{type.FullName}'s member {member.Member.Name} requests a converter who's target type could not be determined");
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goto endConverterAttr;
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}
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}
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if (targetType != member.Type)
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{
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Logger.config.Warn($"{type.FullName}'s member {member.Member.Name} requests a converter that is not of the member's type");
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goto endConverterAttr;
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}
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member.ConverterTarget = targetType;
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if (member.IsGenericConverter)
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member.ConverterBase = typeof(ValueConverter<>).MakeGenericType(targetType);
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else
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member.ConverterBase = typeof(IValueConverter);
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member.HasConverter = true;
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}
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endConverterAttr:
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return true;
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}
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private static IEnumerable<SerializedMemberInfo> ReadObjectMembers(Type type, bool throwOnPrivateField = false, bool throwOnPrivateProperty = false)
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{
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var structure = new List<SerializedMemberInfo>();
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// only looks at public/protected properties
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foreach (var prop in type.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
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{
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if (prop.GetSetMethod(true)?.IsPrivate ?? true)
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{ // we enter this block if the setter is inacessible or doesn't exist
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continue; // ignore props without setter
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}
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if (prop.GetGetMethod(true)?.IsPrivate ?? true)
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{ // we enter this block if the getter is inacessible or doesn't exist
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//continue; // ignore props without getter
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// TODO: is this what I want to do for private properties?
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if (throwOnPrivateProperty)
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throw new InvalidOperationException($"Cannot compile serializer for type {type} with private property {prop.Name}");
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else
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continue;
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}
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var smi = new SerializedMemberInfo
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{
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Member = prop,
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IsVirtual = (prop.GetGetMethod(true)?.IsVirtual ?? false) ||
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(prop.GetSetMethod(true)?.IsVirtual ?? false),
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IsField = false,
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Type = prop.PropertyType
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};
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if (!ProcessAttributesFor(type, ref smi)) continue;
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structure.Add(smi);
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}
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// only look at public/protected fields
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foreach (var field in type.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
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{
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if (field.IsPrivate)
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{
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if (throwOnPrivateField && !field.Name.Contains(">k__BackingField")) // don't throw for private fields that are just backing fields
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throw new InvalidOperationException($"Cannot compile serializer for type {type} with private field {field.Name}");
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else
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continue;
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}
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var smi = new SerializedMemberInfo
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{
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Member = field,
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IsVirtual = false,
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IsField = true,
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Type = field.FieldType
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};
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if (!ProcessAttributesFor(type, ref smi)) continue;
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structure.Add(smi);
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}
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return structure;
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}
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}
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}
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