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299 lines
12 KiB
299 lines
12 KiB
using IPA.Config.Data;
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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.Text;
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using System.Threading.Tasks;
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namespace IPA.Config.Stores.Converters
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{
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/// <summary>
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/// Provides utility functions for custom converters.
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/// </summary>
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public static class Converter
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{
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/// <summary>
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/// Gets the integral value of a <see cref="Value"/>, coercing a <see cref="FloatingPoint"/> if necessary,
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/// or <see langword="null"/> if <paramref name="val"/> is not an <see cref="Integer"/> or <see cref="FloatingPoint"/>.
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/// </summary>
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/// <param name="val">the <see cref="Value"/> to get the integral value of</param>
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/// <returns>the integral value of <paramref name="val"/>, or <see langword="null"/></returns>
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public static long? IntValue(Value val)
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=> val is Integer inte ? inte.Value :
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val is FloatingPoint fp ? fp.AsInteger()?.Value :
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null;
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/// <summary>
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/// Gets the floaing point value of a <see cref="Value"/>, coercing an <see cref="Integer"/> if necessary,
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/// or <see langword="null"/> if <paramref name="val"/> is not an <see cref="Integer"/> or <see cref="FloatingPoint"/>.
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/// </summary>
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/// <param name="val">the <see cref="Value"/> to get the floaing point value of</param>
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/// <returns>the floaing point value of <paramref name="val"/>, or <see langword="null"/></returns>
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public static decimal? FloatValue(Value val)
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=> val is FloatingPoint fp ? fp.Value :
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val is Integer inte ? inte.AsFloat()?.Value :
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null;
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internal interface IValConv<T>
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{
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ValueConverter<T> Get();
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}
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internal class ValConv<T> : IValConv<T> where T : struct
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{
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private static readonly IValConv<T> Impl = ValConvImpls.Impl as IValConv<T> ?? new ValConv<T>();
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public ValueConverter<T> Get() => Impl.Get();
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ValueConverter<T> IValConv<T>.Get()
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=> null; // default to null
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}
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private class ValConvImpls : IValConv<char>,
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IValConv<IntPtr>, IValConv<UIntPtr>,
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IValConv<long>, IValConv<ulong>,
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IValConv<int>, IValConv<uint>,
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IValConv<short>, IValConv<ushort>,
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IValConv<sbyte>, IValConv<byte>,
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IValConv<float>, IValConv<double>,
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IValConv<decimal>
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{
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internal static readonly ValConvImpls Impl = new ValConvImpls();
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ValueConverter<char> IValConv<char>.Get()
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=> new CharConverter();
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ValueConverter<long> IValConv<long>.Get()
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=> new LongConverter();
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ValueConverter<ulong> IValConv<ulong>.Get()
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=> new ULongConverter();
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ValueConverter<IntPtr> IValConv<IntPtr>.Get()
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=> new IntPtrConverter();
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ValueConverter<UIntPtr> IValConv<UIntPtr>.Get()
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=> new UIntPtrConverter();
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ValueConverter<int> IValConv<int>.Get()
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=> new IntConverter();
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ValueConverter<uint> IValConv<uint>.Get()
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=> new UIntConverter();
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ValueConverter<short> IValConv<short>.Get()
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=> new ShortConverter();
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ValueConverter<ushort> IValConv<ushort>.Get()
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=> new UShortConverter();
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ValueConverter<byte> IValConv<byte>.Get()
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=> new ByteConverter();
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ValueConverter<sbyte> IValConv<sbyte>.Get()
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=> new SByteConverter();
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ValueConverter<float> IValConv<float>.Get()
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=> new FloatConverter();
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ValueConverter<double> IValConv<double>.Get()
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=> new DoubleConverter();
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ValueConverter<decimal> IValConv<decimal>.Get()
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=> new DecimalConverter();
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}
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}
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/// <summary>
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/// Provides generic utilities for converters for certain types.
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/// </summary>
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/// <typeparam name="T">the type of the <see cref="ValueConverter{T}"/> that this works on</typeparam>
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public static class Converter<T>
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{
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private static ValueConverter<T> defaultConverter = null;
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/// <summary>
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/// Gets the default <see cref="ValueConverter{T}"/> for the current type.
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/// </summary>
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public static ValueConverter<T> Default
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{
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get
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{
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if (defaultConverter == null)
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defaultConverter = MakeDefault();
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return defaultConverter;
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}
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}
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private static ValueConverter<T> MakeDefault()
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{
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var t = typeof(T);
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if (t.IsValueType)
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{ // we have to do this garbo to make it accept the thing that we know is a value type at instantiation time
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if (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>))
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{ // this is a Nullable
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return Activator.CreateInstance(typeof(NullableConverter<>).MakeGenericType(Nullable.GetUnderlyingType(t))) as ValueConverter<T>;
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}
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var valConv = Activator.CreateInstance(typeof(Converter.ValConv<>).MakeGenericType(t)) as Converter.IValConv<T>;
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return valConv.Get();
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}
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else if (t == typeof(string))
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{
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return new StringConverter() as ValueConverter<T>;
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}
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else
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{
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return Activator.CreateInstance(typeof(CustomObjectConverter<>).MakeGenericType(t)) as ValueConverter<T>;
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}
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}
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}
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/// <summary>
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/// A converter for a <see cref="Nullable{T}"/>.
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/// </summary>
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/// <typeparam name="T">the underlying type of the <see cref="Nullable{T}"/></typeparam>
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public class NullableConverter<T> : ValueConverter<T?> where T : struct
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{
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private readonly ValueConverter<T> baseConverter;
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/// <summary>
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/// Creates a converter with the default converter for the base type.
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/// Equivalent to
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/// <code>
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/// new NullableConverter(Converter<T>.Default)
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/// </code>
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/// </summary>
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/// <seealso cref="NullableConverter{T}.NullableConverter(ValueConverter{T})"/>
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/// <seealso cref="Converter{T}.Default"/>
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public NullableConverter() : this(Converter<T>.Default) { }
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/// <summary>
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/// Creates a converter with the given underlying <see cref="ValueConverter{T}"/>.
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/// </summary>
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/// <param name="underlying">the undlerlying <see cref="ValueConverter{T}"/> to use</param>
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public NullableConverter(ValueConverter<T> underlying)
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=> baseConverter = underlying;
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/// <summary>
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/// Converts a <see cref="Value"/> tree to a value.
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/// </summary>
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/// <param name="value">the <see cref="Value"/> tree to convert</param>
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/// <param name="parent">the object which will own the created object</param>
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/// <returns>the object represented by <paramref name="value"/></returns>
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public override T? FromValue(Value value, object parent)
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=> value == null ? null : new T?(baseConverter.FromValue(value, parent));
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/// <summary>
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/// Converts a nullable <typeparamref name="T"/> to a <see cref="Value"/> tree.
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/// </summary>
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/// <param name="obj">the value to serialize</param>
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/// <param name="parent">the object which owns <paramref name="obj"/></param>
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/// <returns>a <see cref="Value"/> tree representing <paramref name="obj"/>.</returns>
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public override Value ToValue(T? obj, object parent)
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=> obj == null ? null : baseConverter.ToValue(obj.Value, parent);
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}
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internal class StringConverter : ValueConverter<string>
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{
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public override string FromValue(Value value, object parent)
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=> (value as Text)?.Value;
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public override Value ToValue(string obj, object parent)
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=> Value.From(obj);
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}
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internal class CharConverter : ValueConverter<char>
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{
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public override char FromValue(Value value, object parent)
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=> (value as Text).Value[0]; // can throw nullptr
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public override Value ToValue(char obj, object parent)
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=> Value.From(char.ToString(obj));
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}
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internal class LongConverter : ValueConverter<long>
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{
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public override long FromValue(Value value, object parent)
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=> Converter.IntValue(value) ?? throw new ArgumentException("Value not a numeric value", nameof(value));
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public override Value ToValue(long obj, object parent)
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=> Value.From(obj);
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}
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internal class ULongConverter : ValueConverter<ulong>
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{
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public override ulong FromValue(Value value, object parent)
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=> (ulong)(Converter.FloatValue(value) ?? throw new ArgumentException("Value not a numeric value", nameof(value)));
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public override Value ToValue(ulong obj, object parent)
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=> Value.From(obj);
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}
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internal class IntPtrConverter : ValueConverter<IntPtr>
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{
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public override IntPtr FromValue(Value value, object parent)
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=> (IntPtr)Converter<long>.Default.FromValue(value, parent);
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public override Value ToValue(IntPtr obj, object parent)
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=> Value.From((long)obj);
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}
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internal class UIntPtrConverter : ValueConverter<UIntPtr>
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{
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public override UIntPtr FromValue(Value value, object parent)
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=> (UIntPtr)Converter<ulong>.Default.FromValue(value, parent);
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public override Value ToValue(UIntPtr obj, object parent)
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=> Value.From((decimal)obj);
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}
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internal class IntConverter : ValueConverter<int>
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{
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public override int FromValue(Value value, object parent)
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=> (int)Converter<long>.Default.FromValue(value, parent);
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public override Value ToValue(int obj, object parent)
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=> Value.From(obj);
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}
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internal class UIntConverter : ValueConverter<uint>
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{
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public override uint FromValue(Value value, object parent)
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=> (uint)Converter<long>.Default.FromValue(value, parent);
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public override Value ToValue(uint obj, object parent)
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=> Value.From(obj);
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}
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internal class ShortConverter : ValueConverter<short>
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{
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public override short FromValue(Value value, object parent)
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=> (short)Converter<long>.Default.FromValue(value, parent);
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public override Value ToValue(short obj, object parent)
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=> Value.From(obj);
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}
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internal class UShortConverter : ValueConverter<ushort>
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{
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public override ushort FromValue(Value value, object parent)
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=> (ushort)Converter<long>.Default.FromValue(value, parent);
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public override Value ToValue(ushort obj, object parent)
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=> Value.From(obj);
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}
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internal class ByteConverter : ValueConverter<byte>
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{
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public override byte FromValue(Value value, object parent)
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=> (byte)Converter<long>.Default.FromValue(value, parent);
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public override Value ToValue(byte obj, object parent)
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=> Value.From(obj);
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}
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internal class SByteConverter : ValueConverter<sbyte>
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{
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public override sbyte FromValue(Value value, object parent)
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=> (sbyte)Converter<long>.Default.FromValue(value, parent);
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public override Value ToValue(sbyte obj, object parent)
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=> Value.From(obj);
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}
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internal class DecimalConverter : ValueConverter<decimal>
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{
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public override decimal FromValue(Value value, object parent)
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=> Converter.FloatValue(value) ?? throw new ArgumentException("Value not a numeric value", nameof(value));
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public override Value ToValue(decimal obj, object parent)
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=> Value.From(obj);
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}
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internal class FloatConverter : ValueConverter<float>
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{
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public override float FromValue(Value value, object parent)
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=> (float)Converter<decimal>.Default.FromValue(value, parent);
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public override Value ToValue(float obj, object parent)
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=> Value.From((decimal)obj);
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}
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internal class DoubleConverter : ValueConverter<double>
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{
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public override double FromValue(Value value, object parent)
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=> (double)Converter<decimal>.Default.FromValue(value, parent);
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public override Value ToValue(double obj, object parent)
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=> Value.From((decimal)obj);
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}
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}
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