78 lines
2.9 KiB
C#
78 lines
2.9 KiB
C#
// Copyright (c) .NET Foundation. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Collections.Generic;
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using Microsoft.Extensions.Internal;
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namespace Microsoft.AspNetCore.Razor.Language
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{
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/// <summary>
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/// An <see cref="IEqualityComparer{TagHelperRequiredAttributeDescriptor}"/> used to check equality between
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/// two <see cref="RequiredAttributeDescriptor"/>s.
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/// </summary>
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internal class RequiredAttributeDescriptorComparer : IEqualityComparer<RequiredAttributeDescriptor>
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{
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/// <summary>
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/// A default instance of the <see cref="RequiredAttributeDescriptorComparer"/>.
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/// </summary>
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public static readonly RequiredAttributeDescriptorComparer Default =
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new RequiredAttributeDescriptorComparer();
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/// <summary>
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/// A default instance of the <see cref="RequiredAttributeDescriptorComparer"/> that does case-sensitive comparison.
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/// </summary>
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internal static readonly RequiredAttributeDescriptorComparer CaseSensitive =
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new RequiredAttributeDescriptorComparer(caseSensitive: true);
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private readonly StringComparer _stringComparer;
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private readonly StringComparison _stringComparison;
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private RequiredAttributeDescriptorComparer(bool caseSensitive = false)
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{
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if (caseSensitive)
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{
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_stringComparer = StringComparer.Ordinal;
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_stringComparison = StringComparison.Ordinal;
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}
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else
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{
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_stringComparer = StringComparer.OrdinalIgnoreCase;
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_stringComparison = StringComparison.OrdinalIgnoreCase;
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}
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}
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/// <inheritdoc />
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public virtual bool Equals(
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RequiredAttributeDescriptor descriptorX,
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RequiredAttributeDescriptor descriptorY)
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{
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if (object.ReferenceEquals(descriptorX, descriptorY))
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{
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return true;
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}
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if (descriptorX == null ^ descriptorY == null)
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{
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return false;
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}
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return
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descriptorX.NameComparison == descriptorY.NameComparison &&
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descriptorX.ValueComparison == descriptorY.ValueComparison &&
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string.Equals(descriptorX.Name, descriptorY.Name, _stringComparison) &&
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string.Equals(descriptorX.Value, descriptorY.Value, StringComparison.Ordinal) &&
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string.Equals(descriptorX.DisplayName, descriptorY.DisplayName, StringComparison.Ordinal);
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}
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/// <inheritdoc />
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public virtual int GetHashCode(RequiredAttributeDescriptor descriptor)
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{
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var hash = HashCodeCombiner.Start();
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hash.Add(descriptor.Name, _stringComparer);
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return hash.CombinedHash;
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}
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}
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}
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