mirror of
https://github.com/tgstation/tgstation-server.git
synced 2026-08-26 22:48:20 +01:00
Deduplicate BuildSubProjection code
This commit is contained in:
Jordan Dominion
@@ -1,4 +1,5 @@
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using System;
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using System.Diagnostics;
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using System.Linq.Expressions;
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using Tgstation.Server.Host.Authority.Core;
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@@ -48,28 +49,20 @@ namespace Tgstation.Server.Host.Models
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Expression<Func<TInput, TSubInput?>> subInputSelectionExpression)
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where TSubOutput : class
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where TTransformer : ITransformer<TSubInput, TSubOutput>, new()
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{
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var subTransformer = new TTransformer();
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var primaryInput = global::System.Linq.Expressions.Expression.Parameter(typeof(TInput), "input");
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var subInputExpression = global::System.Linq.Expressions.Expression.Invoke(subInputSelectionExpression, primaryInput);
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var notNullExpression = global::System.Linq.Expressions.Expression.MakeBinary(
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ExpressionType.NotEqual,
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subInputExpression,
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global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubInput)));
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var subOutputExpression = global::System.Linq.Expressions.Expression.Invoke(subTransformer.Expression, subInputExpression);
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var conditionalSubOutputExpression = global::System.Linq.Expressions.Expression.Condition(
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notNullExpression,
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subOutputExpression,
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global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubOutput)));
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var outputExpression = global::System.Linq.Expressions.Expression.Invoke(transformerExpression, primaryInput, conditionalSubOutputExpression);
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return global::System.Linq.Expressions.Expression.Lambda<Func<TInput, TOutput>>(outputExpression, primaryInput);
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}
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=> BuildSubProjectionN(
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transformerExpression,
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[
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typeof(TSubInput),
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],
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[
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typeof(TSubOutput),
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],
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[
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subInputSelectionExpression,
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],
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[
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new TTransformer().Expression,
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]);
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/// <summary>
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/// Build an <see cref="Expression{TDelegate}"/> for <typeparamref name="TInput"/> to <typeparamref name="TOutput"/> when <typeparamref name="TInput"/> contains two sub-inputs with their own <see cref="ITransformer{TInput, TOutput}"/>s.
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@@ -98,40 +91,24 @@ namespace Tgstation.Server.Host.Models
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where TSubOutput2 : class
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where TTransformer1 : ITransformer<TSubInput1, TSubOutput1>, new()
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where TTransformer2 : ITransformer<TSubInput2, TSubOutput2>, new()
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{
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var subTransformer1 = new TTransformer1();
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var subTransformer2 = new TTransformer2();
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var primaryInput = global::System.Linq.Expressions.Expression.Parameter(typeof(TInput), "input");
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var subInput1Expression = global::System.Linq.Expressions.Expression.Invoke(subInput1SelectionExpression, primaryInput);
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var subInput2Expression = global::System.Linq.Expressions.Expression.Invoke(subInput2SelectionExpression, primaryInput);
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var notNullExpression1 = global::System.Linq.Expressions.Expression.MakeBinary(
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ExpressionType.NotEqual,
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subInput1Expression,
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global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubInput1)));
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var notNullExpression2 = global::System.Linq.Expressions.Expression.MakeBinary(
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ExpressionType.NotEqual,
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subInput2Expression,
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global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubInput2)));
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var subOutput1Expression = global::System.Linq.Expressions.Expression.Invoke(subTransformer1.Expression, subInput1Expression);
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var subOutput2Expression = global::System.Linq.Expressions.Expression.Invoke(subTransformer2.Expression, subInput2Expression);
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var conditionalSubOutput1Expression = global::System.Linq.Expressions.Expression.Condition(
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notNullExpression1,
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subOutput1Expression,
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global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubOutput1)));
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var conditionalSubOutput2Expression = global::System.Linq.Expressions.Expression.Condition(
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notNullExpression2,
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subOutput2Expression,
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global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubOutput2)));
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var outputExpression = global::System.Linq.Expressions.Expression.Invoke(transformerExpression, primaryInput, conditionalSubOutput1Expression, conditionalSubOutput2Expression);
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return global::System.Linq.Expressions.Expression.Lambda<Func<TInput, TOutput>>(outputExpression, primaryInput);
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}
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=> BuildSubProjectionN(
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transformerExpression,
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[
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typeof(TSubInput1),
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typeof(TSubInput2),
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],
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[
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typeof(TSubOutput1),
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typeof(TSubOutput2),
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],
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[
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subInput1SelectionExpression,
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subInput2SelectionExpression,
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],
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[
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new TTransformer1().Expression,
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new TTransformer2().Expression,
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]);
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/// <summary>
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/// Build an <see cref="Expression{TDelegate}"/> for <typeparamref name="TInput"/> to <typeparamref name="TOutput"/> when <typeparamref name="TInput"/> contains three sub-inputs with their own <see cref="ITransformer{TInput, TOutput}"/>s.
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@@ -170,53 +147,78 @@ namespace Tgstation.Server.Host.Models
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where TTransformer1 : ITransformer<TSubInput1, TSubOutput1>, new()
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where TTransformer2 : ITransformer<TSubInput2, TSubOutput2>, new()
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where TTransformer3 : ITransformer<TSubInput3, TSubOutput3>, new()
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=> BuildSubProjectionN(
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transformerExpression,
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[
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typeof(TSubInput1),
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typeof(TSubInput2),
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typeof(TSubInput3),
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],
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[
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typeof(TSubOutput1),
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typeof(TSubOutput2),
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typeof(TSubOutput3),
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],
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[
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subInput1SelectionExpression,
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subInput2SelectionExpression,
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subInput3SelectionExpression,
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],
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[
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new TTransformer1().Expression,
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new TTransformer2().Expression,
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new TTransformer3().Expression,
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]);
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/// <summary>
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/// Build an <see cref="Expression{TDelegate}"/> for <typeparamref name="TInput"/> to <typeparamref name="TOutput"/> when <typeparamref name="TInput"/> contains N sub-inputs with their own <see cref="ITransformer{TInput, TOutput}"/>s.
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/// </summary>
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/// <param name="transformerExpression">The <see cref="Expression{TDelegate}"/> to take a <typeparamref name="TInput"/> and transformed sub-outputs and produce a <typeparamref name="TOutput"/>.</param>
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/// <param name="subInputTypes">The <see cref="Type"/>s in <typeparamref name="TInput"/> that need transforming.</param>
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/// <param name="subOutputTypes">The transformed <paramref name="subInputTypes"/>.</param>
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/// <param name="subInputSelectionExpressions"><see cref="LambdaExpression"/>s to select the <paramref name="subInputTypes"/> from <typeparamref name="TInput"/>.</param>
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/// <param name="subInputTransformerExpressions"><see cref="LambdaExpression"/>s to transform the <paramref name="subInputTypes"/> into <paramref name="subOutputTypes"/>.</param>
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/// <returns>An expression converting <typeparamref name="TInput"/> into <typeparamref name="TOutput"/> based on <paramref name="transformerExpression"/> with its other arguments generated from the transformation result of <paramref name="subInputSelectionExpressions"/>.</returns>
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private static Expression<Func<TInput, TOutput>> BuildSubProjectionN(
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LambdaExpression transformerExpression,
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Type[] subInputTypes,
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Type[] subOutputTypes,
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LambdaExpression[] subInputSelectionExpressions,
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LambdaExpression[] subInputTransformerExpressions)
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{
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var subTransformer1 = new TTransformer1();
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var subTransformer2 = new TTransformer2();
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var subTransformer3 = new TTransformer3();
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var n = subInputTypes.Length;
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Debug.Assert(n == subOutputTypes.Length, $"{nameof(subOutputTypes)}.{nameof(Array.Length)} != {nameof(subInputTypes)}.{nameof(Array.Length)}");
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Debug.Assert(n == subInputSelectionExpressions.Length, $"{nameof(subInputSelectionExpressions)}.{nameof(Array.Length)} != n");
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Debug.Assert(n == subInputTransformerExpressions.Length, $"{nameof(subInputTransformerExpressions)}.{nameof(Array.Length)} != n");
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var primaryInput = global::System.Linq.Expressions.Expression.Parameter(typeof(TInput), "input");
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var subInput1Expression = global::System.Linq.Expressions.Expression.Invoke(subInput1SelectionExpression, primaryInput);
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var subInput2Expression = global::System.Linq.Expressions.Expression.Invoke(subInput2SelectionExpression, primaryInput);
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var subInput3Expression = global::System.Linq.Expressions.Expression.Invoke(subInput3SelectionExpression, primaryInput);
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var finalExpressionParameters = new Expression[n + 1];
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finalExpressionParameters[0] = primaryInput;
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var notNullExpression1 = global::System.Linq.Expressions.Expression.MakeBinary(
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ExpressionType.NotEqual,
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subInput1Expression,
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global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubInput1)));
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var notNullExpression2 = global::System.Linq.Expressions.Expression.MakeBinary(
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ExpressionType.NotEqual,
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subInput2Expression,
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global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubInput2)));
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var notNullExpression3 = global::System.Linq.Expressions.Expression.MakeBinary(
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ExpressionType.NotEqual,
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subInput3Expression,
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global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubInput3)));
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for (int i = 0; i < n; i++)
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{
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var subInputExpression = global::System.Linq.Expressions.Expression.Invoke(subInputSelectionExpressions[i], primaryInput);
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var subOutput1Expression = global::System.Linq.Expressions.Expression.Invoke(subTransformer1.Expression, subInput1Expression);
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var subOutput2Expression = global::System.Linq.Expressions.Expression.Invoke(subTransformer2.Expression, subInput2Expression);
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var subOutput3Expression = global::System.Linq.Expressions.Expression.Invoke(subTransformer3.Expression, subInput3Expression);
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var notNullExpression = global::System.Linq.Expressions.Expression.MakeBinary(
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ExpressionType.NotEqual,
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subInputExpression,
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global::System.Linq.Expressions.Expression.Constant(null, subInputTypes[i]));
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var conditionalSubOutput1Expression = global::System.Linq.Expressions.Expression.Condition(
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notNullExpression1,
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subOutput1Expression,
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global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubOutput1)));
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var conditionalSubOutput2Expression = global::System.Linq.Expressions.Expression.Condition(
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notNullExpression2,
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subOutput2Expression,
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global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubOutput2)));
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var conditionalSubOutput3Expression = global::System.Linq.Expressions.Expression.Condition(
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notNullExpression3,
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subOutput3Expression,
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global::System.Linq.Expressions.Expression.Constant(null, typeof(TSubOutput3)));
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var subOutputExpression = global::System.Linq.Expressions.Expression.Invoke(subInputTransformerExpressions[i], subInputExpression);
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var conditionalSubOutputExpression = global::System.Linq.Expressions.Expression.Condition(
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notNullExpression,
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subOutputExpression,
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global::System.Linq.Expressions.Expression.Constant(null, subOutputTypes[i]));
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finalExpressionParameters[i + 1] = conditionalSubOutputExpression;
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}
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var outputExpression = global::System.Linq.Expressions.Expression.Invoke(
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transformerExpression,
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primaryInput,
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conditionalSubOutput1Expression,
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conditionalSubOutput2Expression,
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conditionalSubOutput3Expression);
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finalExpressionParameters);
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return global::System.Linq.Expressions.Expression.Lambda<Func<TInput, TOutput>>(outputExpression, primaryInput);
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}
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