48 lines
3.2 KiB
C#
48 lines
3.2 KiB
C#
// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
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using System.Collections.Generic;
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using System.Linq.Expressions;
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using Xunit;
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namespace System.Web.Mvc.ExpressionUtil.Test
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{
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public class HoistingExpressionVisitorTest
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{
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[Fact]
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public void Hoist()
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{
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// Arrange
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Expression<Func<string, int>> expr = s => 2 * s.Length + 1;
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// Act
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Expression<Hoisted<string, int>> hoisted = HoistingExpressionVisitor<string, int>.Hoist(expr);
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// Assert
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// new expression should be (s, capturedConstants) => (int)(capturedConstants[0]) * s.Length + (int)(capturedConstants[1])
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// with fingerprint [ LAMBDA:Hoisted<string, int>, OP_ADD:int, OP_MULTIPLY:int, OP_CAST:int, INDEX(List<object>.get_Item):object, PARAM(0):List<object>, CONST:int, MEMBER(String.Length):int, PARAM(1):string, OP_CAST:int, INDEX(List<object>.get_Item):object, PARAM(0):List<object>, CONST:int, PARAM(1):string, PARAM(0):List<object> ]
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List<object> capturedConstants;
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ExpressionFingerprintChain fingerprint = FingerprintingExpressionVisitor.GetFingerprintChain(hoisted, out capturedConstants);
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Assert.Equal(new object[] { 0, 1 }, capturedConstants.ToArray()); // these are constants from the hoisted expression (array indexes), not the original expression
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FingerprintingExpressionVisitorTest.AssertChainEquals(
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fingerprint,
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new LambdaExpressionFingerprint(ExpressionType.Lambda, typeof(Hoisted<string, int>)),
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new BinaryExpressionFingerprint(ExpressionType.Add, typeof(int), null /* method */),
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new BinaryExpressionFingerprint(ExpressionType.Multiply, typeof(int), null /* method */),
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new UnaryExpressionFingerprint(ExpressionType.Convert, typeof(int), null /* method */),
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new IndexExpressionFingerprint(ExpressionType.Index, typeof(object), typeof(List<object>).GetProperty("Item")),
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new ParameterExpressionFingerprint(ExpressionType.Parameter, typeof(List<object>), 0 /* parameterIndex */),
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new ConstantExpressionFingerprint(ExpressionType.Constant, typeof(int)),
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new MemberExpressionFingerprint(ExpressionType.MemberAccess, typeof(int), typeof(string).GetProperty("Length")),
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new ParameterExpressionFingerprint(ExpressionType.Parameter, typeof(string), 1 /* parameterIndex */),
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new UnaryExpressionFingerprint(ExpressionType.Convert, typeof(int), null /* method */),
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new IndexExpressionFingerprint(ExpressionType.Index, typeof(object), typeof(List<object>).GetProperty("Item")),
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new ParameterExpressionFingerprint(ExpressionType.Parameter, typeof(List<object>), 0 /* parameterIndex */),
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new ConstantExpressionFingerprint(ExpressionType.Constant, typeof(int)),
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new ParameterExpressionFingerprint(ExpressionType.Parameter, typeof(string), 1 /* parameterIndex */),
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new ParameterExpressionFingerprint(ExpressionType.Parameter, typeof(List<object>), 0 /* parameterIndex */));
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}
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}
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}
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