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113 lines
5.6 KiB
113 lines
5.6 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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}
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/// <summary>
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/// A <see cref="ValueConverter{T}"/> for objects normally serialized to config via <see cref="GeneratedExtension.Generated{T}(Config, bool)"/>.
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/// </summary>
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/// <typeparam name="T">the same type parameter that would be passed into <see cref="GeneratedExtension.Generated{T}(Config, bool)"/></typeparam>
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/// <seealso cref="GeneratedExtension.Generated{T}(Config, bool)"/>
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public class CustomObjectConverter<T> : ValueConverter<T> where T : class
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{
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private interface IImpl
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{
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T FromValue(Value value, object parent);
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Value ToValue(T obj, object parent);
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}
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private class Impl<U> : IImpl where U : class, GeneratedStore.IGeneratedStore, T
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{
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private static readonly GeneratedStore.GeneratedStoreCreator creator = GeneratedStore.GetCreator(typeof(T));
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public T FromValue(Value value, object parent)
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{ // lots of casting here, but it works i promise (parent can be a non-IGeneratedStore, however it won't necessarily behave then)
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var obj = creator(parent as GeneratedStore.IGeneratedStore) as U;
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obj.Deserialize(value);
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return obj;
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}
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public Value ToValue(T obj, object parent)
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{
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if (obj is GeneratedStore.IGeneratedStore store)
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return store.Serialize();
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else
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return null; // TODO: make this behave sanely instead of just giving null
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}
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}
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private static readonly IImpl impl = (IImpl)Activator.CreateInstance(
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typeof(Impl<>).MakeGenericType(GeneratedStore.GetGeneratedType(typeof(T))));
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/// <summary>
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/// Deserializes <paramref name="value"/> into a <typeparamref name="T"/> with the given <paramref name="parent"/>.
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/// </summary>
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/// <param name="value">the <see cref="Value"/> to deserialize</param>
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/// <param name="parent">the parent object that will own the deserialized value</param>
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/// <returns>the deserialized value</returns>
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/// <seealso cref="ValueConverter{T}.FromValue(Value, object)"/>
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public static T Deserialize(Value value, object parent)
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=> impl.FromValue(value, parent);
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/// <summary>
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/// Serializes <paramref name="obj"/> into a <see cref="Value"/> structure, given <paramref name="parent"/>.
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/// </summary>
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/// <param name="obj">the object to serialize</param>
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/// <param name="parent">the parent object that owns <paramref name="obj"/></param>
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/// <returns>the <see cref="Value"/> tree that represents <paramref name="obj"/></returns>
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/// <seealso cref="ValueConverter{T}.ToValue(T, object)"/>
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public static Value Serialize(T obj, object parent)
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=> impl.ToValue(obj, parent);
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/// <summary>
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/// Deserializes <paramref name="value"/> into a <typeparamref name="T"/> with the given <paramref name="parent"/>.
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/// </summary>
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/// <param name="value">the <see cref="Value"/> to deserialize</param>
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/// <param name="parent">the parent object that will own the deserialized value</param>
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/// <returns>the deserialized value</returns>
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/// <seealso cref="ValueConverter{T}.FromValue(Value, object)"/>
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public override T FromValue(Value value, object parent)
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=> impl.FromValue(value, parent);
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/// <summary>
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/// Serializes <paramref name="obj"/> into a <see cref="Value"/> structure, given <paramref name="parent"/>.
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/// </summary>
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/// <param name="obj">the object to serialize</param>
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/// <param name="parent">the parent object that owns <paramref name="obj"/></param>
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/// <returns>the <see cref="Value"/> tree that represents <paramref name="obj"/></returns>
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/// <seealso cref="ValueConverter{T}.ToValue(T, object)"/>
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public override Value ToValue(T obj, object parent)
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=> impl.ToValue(obj, parent);
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}
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}
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