/
SymbolDefinitionComparer.cs
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/
SymbolDefinitionComparer.cs
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// Copyright (c) Josef Pihrt. All rights reserved. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
using Microsoft.CodeAnalysis;
namespace Roslynator
{
internal abstract class SymbolDefinitionComparer : IComparer<ISymbol>
{
internal SymbolDefinitionComparer(SymbolDefinitionSortOptions options = SymbolDefinitionSortOptions.None)
{
Options = options;
}
public static SymbolDefinitionComparer Default { get; } = new DefaultSymbolDefinitionComparer(SymbolDefinitionSortOptions.None);
public static SymbolDefinitionComparer SystemFirst { get; } = new DefaultSymbolDefinitionComparer(SymbolDefinitionSortOptions.SystemFirst);
public static SymbolDefinitionComparer OmitContainingNamespace { get; } = new DefaultSymbolDefinitionComparer(SymbolDefinitionSortOptions.OmitContainingNamespace);
public static SymbolDefinitionComparer SystemFirstOmitContainingNamespace { get; } = new DefaultSymbolDefinitionComparer(SymbolDefinitionSortOptions.SystemFirst | SymbolDefinitionSortOptions.OmitContainingNamespace);
public SymbolDefinitionSortOptions Options { get; }
public abstract IComparer<INamespaceSymbol> NamespaceComparer { get; }
public abstract IComparer<INamedTypeSymbol> TypeComparer { get; }
public abstract IComparer<ISymbol> MemberComparer { get; }
public int Compare(ISymbol x, ISymbol y)
{
if (object.ReferenceEquals(x, y))
return 0;
if (x == null)
return -1;
if (y == null)
return 1;
switch (x.Kind)
{
case SymbolKind.Namespace:
{
var namespaceSymbol = (INamespaceSymbol)x;
switch (y.Kind)
{
case SymbolKind.Namespace:
return NamespaceComparer.Compare(namespaceSymbol, (INamespaceSymbol)y);
case SymbolKind.NamedType:
case SymbolKind.Event:
case SymbolKind.Field:
case SymbolKind.Method:
case SymbolKind.Property:
return -CompareSymbolAndNamespaceSymbol(y, namespaceSymbol);
}
break;
}
case SymbolKind.NamedType:
{
var typeSymbol = (INamedTypeSymbol)x;
switch (y.Kind)
{
case SymbolKind.Namespace:
return CompareSymbolAndNamespaceSymbol(typeSymbol, (INamespaceSymbol)y);
case SymbolKind.NamedType:
return CompareNamedTypeSymbol(typeSymbol, (INamedTypeSymbol)y);
case SymbolKind.Event:
case SymbolKind.Field:
case SymbolKind.Method:
case SymbolKind.Property:
return -CompareSymbolAndNamedTypeSymbol(y, typeSymbol);
}
break;
}
case SymbolKind.Event:
case SymbolKind.Field:
case SymbolKind.Method:
case SymbolKind.Property:
{
switch (y.Kind)
{
case SymbolKind.Namespace:
return CompareSymbolAndNamespaceSymbol(x, (INamespaceSymbol)y);
case SymbolKind.NamedType:
return CompareSymbolAndNamedTypeSymbol(x, (INamedTypeSymbol)y);
case SymbolKind.Event:
case SymbolKind.Field:
case SymbolKind.Method:
case SymbolKind.Property:
return CompareMemberSymbol(x, y);
}
break;
}
}
throw new InvalidOperationException();
}
private int CompareNamedTypeSymbol(INamedTypeSymbol typeSymbol1, INamedTypeSymbol typeSymbol2)
{
int diff = CompareContainingNamespace(typeSymbol1, typeSymbol2);
if (diff != 0)
return diff;
return TypeComparer.Compare(typeSymbol1, typeSymbol2);
}
private int CompareMemberSymbol(ISymbol symbol1, ISymbol symbol2)
{
int diff = CompareNamedTypeSymbol(symbol1.ContainingType, symbol2.ContainingType);
if (diff != 0)
return diff;
return MemberComparer.Compare(symbol1, symbol2);
}
private int CompareSymbolAndNamespaceSymbol(ISymbol symbol, INamespaceSymbol namespaceSymbol)
{
int diff = NamespaceComparer.Compare(symbol.ContainingNamespace, namespaceSymbol);
if (diff != 0)
return diff;
return 1;
}
private int CompareSymbolAndNamedTypeSymbol(ISymbol symbol, INamedTypeSymbol typeSymbol)
{
int diff = TypeComparer.Compare(symbol.ContainingType, typeSymbol);
if (diff != 0)
return diff;
return 1;
}
internal int CompareContainingNamespace(ISymbol x, ISymbol y)
{
Debug.Assert(x.Kind != SymbolKind.Namespace, x.Kind.ToString());
Debug.Assert(y.Kind != SymbolKind.Namespace, y.Kind.ToString());
return NamespaceComparer.Compare(x.ContainingNamespace, y.ContainingNamespace);
}
public static int CompareName(ISymbol symbol1, ISymbol symbol2)
{
return string.CompareOrdinal(symbol1.Name, symbol2.Name);
}
private class DefaultSymbolDefinitionComparer : SymbolDefinitionComparer
{
private IComparer<INamespaceSymbol> _namespaceComparer;
private IComparer<INamedTypeSymbol> _typeComparer;
private IComparer<ISymbol> _memberComparer;
internal DefaultSymbolDefinitionComparer(SymbolDefinitionSortOptions options = SymbolDefinitionSortOptions.None)
: base(options)
{
}
public override IComparer<INamespaceSymbol> NamespaceComparer
{
get
{
if (_namespaceComparer == null)
Interlocked.CompareExchange(ref _namespaceComparer, CreateNamespaceComparer(), null);
return _namespaceComparer;
IComparer<INamespaceSymbol> CreateNamespaceComparer()
{
return new NamespaceSymbolDefinitionComparer(this);
}
}
}
public override IComparer<INamedTypeSymbol> TypeComparer
{
get
{
if (_typeComparer == null)
Interlocked.CompareExchange(ref _typeComparer, CreateTypeComparer(), null);
return _typeComparer;
IComparer<INamedTypeSymbol> CreateTypeComparer()
{
return new NamedTypeSymbolDefinitionComparer(this);
}
}
}
public override IComparer<ISymbol> MemberComparer
{
get
{
if (_memberComparer == null)
Interlocked.CompareExchange(ref _memberComparer, CreateMemberComparer(), null);
return _memberComparer;
IComparer<ISymbol> CreateMemberComparer()
{
return new MemberSymbolDefinitionComparer(this);
}
}
}
}
}
}