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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.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Text;
namespace Roslynator.CSharp.Refactorings
{
internal static class RemoveEnumMemberValueRefactoring
{
public static void ComputeRefactoring(
RefactoringContext context,
EnumDeclarationSyntax enumDeclaration,
SeparatedSyntaxListSelection<EnumMemberDeclarationSyntax> selectedMembers)
{
int count = 0;
for (int i = 0; i < selectedMembers.Count; i++)
{
if (selectedMembers[i].EqualsValue?.Value != null)
{
count++;
if (count == 2)
break;
}
}
if (count == 0)
return;
context.RegisterRefactoring(
(count == 1) ? "Remove enum value" : "Remove enum values",
ct => RefactorAsync(context.Document, enumDeclaration, selectedMembers, keepCompositeValue: false, ct),
RefactoringIdentifiers.RemoveEnumMemberValue);
}
public static void ComputeRefactoring(
RefactoringContext context,
EnumDeclarationSyntax enumDeclaration)
{
int count = 0;
SeparatedSyntaxList<EnumMemberDeclarationSyntax> members = enumDeclaration.Members;
for (int i = 0; i < members.Count; i++)
{
if (members[i].EqualsValue?.Value != null)
{
count++;
if (count == 2)
break;
}
}
if (count == 0)
return;
context.RegisterRefactoring(
(count == 1) ? "Remove explicit value" : "Remove explicit values",
ct => RefactorAsync(context.Document, enumDeclaration, members, keepCompositeValue: true, ct),
RefactoringIdentifiers.RemoveEnumMemberValue);
}
private static async Task<Document> RefactorAsync(
Document document,
EnumDeclarationSyntax enumDeclaration,
IEnumerable<EnumMemberDeclarationSyntax> enumMembers,
bool keepCompositeValue,
CancellationToken cancellationToken)
{
SemanticModel semanticModel = null;
if (keepCompositeValue)
{
semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
INamedTypeSymbol enumSymbol = semanticModel.GetDeclaredSymbol(enumDeclaration, cancellationToken);
keepCompositeValue = enumSymbol.HasAttribute(MetadataNames.System_FlagsAttribute);
}
IEnumerable<TextChange> textChanges = enumMembers
.Where(enumMember =>
{
ExpressionSyntax expression = enumMember.EqualsValue?.Value;
if (expression == null)
return false;
if (keepCompositeValue
&& !(expression is LiteralExpressionSyntax))
{
IFieldSymbol fieldSymbol = semanticModel.GetDeclaredSymbol(enumMember, cancellationToken);
if (!fieldSymbol.HasConstantValue)
return false;
ulong value = SymbolUtility.GetEnumValueAsUInt64(fieldSymbol.ConstantValue, fieldSymbol.ContainingType);
if (FlagsUtility<ulong>.Instance.IsComposite(value))
return false;
}
return true;
})
.Select(f => new TextChange(TextSpan.FromBounds(f.Identifier.Span.End, f.EqualsValue.Span.End), ""));
return await document.WithTextChangesAsync(textChanges, cancellationToken).ConfigureAwait(false);
}
}
}
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