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MemberSymbolDefinitionComparer.cs
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MemberSymbolDefinitionComparer.cs
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// Copyright (c) Josef Pihrt and Contributors. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using Microsoft.CodeAnalysis;
namespace Roslynator;
internal sealed class MemberSymbolDefinitionComparer : IComparer<ISymbol>
{
internal MemberSymbolDefinitionComparer(SymbolDefinitionComparer symbolComparer)
{
SymbolComparer = symbolComparer;
}
public SymbolDefinitionComparer SymbolComparer { get; }
public int Compare(ISymbol x, ISymbol y)
{
Debug.Assert(x.IsKind(SymbolKind.Event, SymbolKind.Field, SymbolKind.Method, SymbolKind.Property), x.Kind.ToString());
Debug.Assert(y.IsKind(SymbolKind.Event, SymbolKind.Field, SymbolKind.Method, SymbolKind.Property), y.Kind.ToString());
if (object.ReferenceEquals(x, y))
return 0;
if (x is null)
return -1;
if (y is null)
return 1;
int diff;
if ((SymbolComparer.Options & SymbolDefinitionSortOptions.OmitContainingNamespace) == 0)
{
diff = CompareContainingNamespace(x, y);
if (diff != 0)
return diff;
}
if ((SymbolComparer.Options & SymbolDefinitionSortOptions.OmitContainingType) == 0)
{
diff = SymbolComparer.TypeComparer.Compare(x.ContainingType, y.ContainingType);
if (diff != 0)
return diff;
}
MemberDeclarationKind kind1 = x.GetMemberDeclarationKind();
MemberDeclarationKind kind2 = y.GetMemberDeclarationKind();
diff = ((int)kind1).CompareTo((int)kind2);
if (diff != 0)
return diff;
switch (kind1)
{
case MemberDeclarationKind.Constructor:
case MemberDeclarationKind.Method:
{
return CompareMethods((IMethodSymbol)x, (IMethodSymbol)y);
}
case MemberDeclarationKind.Indexer:
case MemberDeclarationKind.Property:
{
return CompareProperties((IPropertySymbol)x, (IPropertySymbol)y);
}
case MemberDeclarationKind.ExplicitlyImplementedEvent:
{
var e1 = (IEventSymbol)x;
var e2 = (IEventSymbol)y;
diff = CompareExplicitImplementations(e1.ExplicitInterfaceImplementations, e2.ExplicitInterfaceImplementations);
if (diff != 0)
return diff;
break;
}
case MemberDeclarationKind.ExplicitlyImplementedMethod:
{
var m1 = (IMethodSymbol)x;
var m2 = (IMethodSymbol)y;
diff = CompareExplicitImplementations(m1.ExplicitInterfaceImplementations, m2.ExplicitInterfaceImplementations);
if (diff != 0)
return diff;
return CompareMethods(m1, m2);
}
case MemberDeclarationKind.ExplicitlyImplementedProperty:
{
var p1 = (IPropertySymbol)x;
var p2 = (IPropertySymbol)y;
diff = CompareExplicitImplementations(p1.ExplicitInterfaceImplementations, p2.ExplicitInterfaceImplementations);
if (diff != 0)
return diff;
return CompareProperties(p1, p2);
}
}
diff = SymbolDefinitionComparer.CompareName(x, y);
if (diff != 0)
return diff;
return CompareContainingNamespace(x, y);
}
private int CompareMethods(IMethodSymbol methodSymbol1, IMethodSymbol methodSymbol2)
{
int diff = SymbolDefinitionComparer.CompareName(methodSymbol1, methodSymbol2);
if (diff != 0)
return diff;
diff = methodSymbol1.TypeParameters.Length.CompareTo(methodSymbol2.TypeParameters.Length);
if (diff != 0)
return diff;
diff = CompareParameters(methodSymbol1.Parameters, methodSymbol2.Parameters);
if (diff != 0)
return diff;
return CompareContainingNamespace(methodSymbol1, methodSymbol2);
}
private int CompareProperties(IPropertySymbol propertySymbol1, IPropertySymbol propertySymbol2)
{
int diff = SymbolDefinitionComparer.CompareName(propertySymbol1, propertySymbol2);
if (diff != 0)
return diff;
diff = CompareParameters(propertySymbol1.Parameters, propertySymbol2.Parameters);
if (diff != 0)
return diff;
return CompareContainingNamespace(propertySymbol1, propertySymbol2);
}
private int CompareExplicitImplementations<TSymbol>(ImmutableArray<TSymbol> x, ImmutableArray<TSymbol> y) where TSymbol : ISymbol
{
return SymbolComparer.TypeComparer.Compare(x[0].ContainingType, y[0].ContainingType);
}
private static int CompareParameters(ImmutableArray<IParameterSymbol> parameters1, ImmutableArray<IParameterSymbol> parameters2)
{
int length = parameters1.Length;
int diff = length.CompareTo(parameters2.Length);
if (diff != 0)
return diff;
for (int i = 0; i < length; i++)
{
diff = CompareParameter(parameters1[i], parameters2[i]);
if (diff != 0)
return diff;
}
return 0;
}
private static int CompareParameter(IParameterSymbol x, IParameterSymbol y)
{
if (object.ReferenceEquals(x, y))
return 0;
if (x is null)
return -1;
if (y is null)
return 1;
int diff = ((int)x.RefKind).CompareTo((int)y.RefKind);
if (diff != 0)
return diff;
return SymbolDefinitionComparer.CompareName(x, y);
}
private int CompareContainingNamespace(ISymbol x, ISymbol y)
{
return SymbolComparer.CompareContainingNamespace(x, y);
}
}