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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.FindSymbols;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.LanguageService;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Simplification;
using Microsoft.CodeAnalysis.Text;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.Rename
{
internal static class RenameUtilities
{
internal static SyntaxToken UpdateAliasAnnotation(SyntaxToken token, ISymbol aliasSymbol, string replacementText)
{
// If the below Single() assert fails then it means the token has gone through a rename session where
// it obtained an AliasSyntaxAnnotation and it is going through another rename session. Make sure the token
// has only one annotation pertaining to the current session or try to extract only the current session annotation
var originalAliasAnnotation = token.GetAnnotations(AliasAnnotation.Kind).Single();
var originalAliasName = AliasAnnotation.GetAliasName(originalAliasAnnotation);
if (originalAliasName == aliasSymbol.Name)
{
token = token.WithoutAnnotations(originalAliasAnnotation);
var replacementAliasAnnotation = AliasAnnotation.Create(replacementText);
token = token.WithAdditionalAnnotations(replacementAliasAnnotation);
}
return token;
}
internal static ImmutableArray<ISymbol> GetSymbolsTouchingPosition(
int position, SemanticModel semanticModel, SolutionServices services, CancellationToken cancellationToken)
{
var bindableToken = semanticModel.SyntaxTree.GetRoot(cancellationToken).FindToken(position, findInsideTrivia: true);
var semanticInfo = semanticModel.GetSemanticInfo(bindableToken, services, cancellationToken);
var symbols = semanticInfo.DeclaredSymbol != null
? ImmutableArray.Create<ISymbol>(semanticInfo.DeclaredSymbol)
: semanticInfo.GetSymbols(includeType: false);
// if there are more than one symbol, then remove the alias symbols.
// When using (not declaring) an alias, the alias symbol and the target symbol are returned
// by GetSymbols
if (symbols.Length > 1)
{
symbols = symbols.WhereAsArray(s => s.Kind != SymbolKind.Alias);
}
if (symbols.Length == 0)
{
var info = semanticModel.GetSymbolInfo(bindableToken, cancellationToken);
if (info.CandidateReason == CandidateReason.MemberGroup)
{
return info.CandidateSymbols;
}
}
return symbols;
}
private static bool IsSymbolDefinedInsideMethod(ISymbol symbol)
{
return
symbol.Kind is SymbolKind.Local or
SymbolKind.Label or
SymbolKind.RangeVariable or
SymbolKind.Parameter;
}
internal static IEnumerable<Document> GetDocumentsAffectedByRename(ISymbol symbol, Solution solution, IEnumerable<RenameLocation> renameLocations)
{
if (IsSymbolDefinedInsideMethod(symbol))
{
// if the symbol was declared inside of a method, don't check for conflicts in non-renamed documents.
return renameLocations.Select(l => solution.GetRequiredDocument(l.DocumentId));
}
else
{
var documentsOfRenameSymbolDeclaration = symbol.Locations.Where(l => l.IsInSource).Select(l => solution.GetRequiredDocument(l.SourceTree!));
var projectIdsOfRenameSymbolDeclaration =
documentsOfRenameSymbolDeclaration.SelectMany(d => d.GetLinkedDocumentIds())
.Concat(documentsOfRenameSymbolDeclaration.First().Id)
.Select(d => d.ProjectId).Distinct();
// perf optimization: only look in declaring project when possible
if (ShouldRenameOnlyAffectDeclaringProject(symbol))
{
var isSubset = renameLocations.Select(l => l.DocumentId.ProjectId).Distinct().Except(projectIdsOfRenameSymbolDeclaration).IsEmpty();
Contract.ThrowIfFalse(isSubset);
return projectIdsOfRenameSymbolDeclaration.SelectMany(p => solution.GetRequiredProject(p).Documents);
}
else
{
// We are trying to figure out the projects that directly depend on the project that contains the declaration for
// the rename symbol. Other projects should not be affected by the rename.
var relevantProjects = projectIdsOfRenameSymbolDeclaration.Concat(projectIdsOfRenameSymbolDeclaration.SelectMany(p =>
solution.GetProjectDependencyGraph().GetProjectsThatDirectlyDependOnThisProject(p))).Distinct();
return relevantProjects.SelectMany(p => solution.GetRequiredProject(p).Documents);
}
}
}
/// <summary>
/// Renaming a private symbol typically confines the set of references and potential
/// conflicts to that symbols declaring project. However, rename may cascade to
/// non-public symbols which may then require other projects be considered.
/// </summary>
private static bool ShouldRenameOnlyAffectDeclaringProject(ISymbol symbol)
{
if (symbol.DeclaredAccessibility != Accessibility.Private)
{
// non-private members can influence other projects.
return false;
}
if (symbol.ExplicitInterfaceImplementations().Any())
{
// Explicit interface implementations can cascade to other projects
return false;
}
if (symbol.IsOverride)
{
// private-overrides aren't actually legal. But if we see one, we tolerate it and search other projects in case
// they override it.
// https://github.com/dotnet/roslyn/issues/25682
return false;
}
return true;
}
internal static TokenRenameInfo GetTokenRenameInfo(
ISemanticFactsService semanticFacts,
SemanticModel semanticModel,
SyntaxToken token,
CancellationToken cancellationToken)
{
var symbol = semanticFacts.GetDeclaredSymbol(semanticModel, token, cancellationToken);
if (symbol != null)
{
return TokenRenameInfo.CreateSingleSymbolTokenInfo(symbol);
}
var symbolInfo = semanticModel.GetSymbolInfo(token, cancellationToken);
if (symbolInfo.Symbol != null)
{
if (symbolInfo.Symbol.IsTupleType())
{
return TokenRenameInfo.NoSymbolsTokenInfo;
}
return TokenRenameInfo.CreateSingleSymbolTokenInfo(symbolInfo.Symbol);
}
if (symbolInfo.CandidateReason == CandidateReason.MemberGroup && symbolInfo.CandidateSymbols.Any())
{
// This is a reference from a nameof expression. Allow the rename but set the RenameOverloads option
return TokenRenameInfo.CreateMemberGroupTokenInfo(symbolInfo.CandidateSymbols);
}
if (RenameLocation.ShouldRename(symbolInfo.CandidateReason) &&
symbolInfo.CandidateSymbols.Length == 1)
{
// TODO(cyrusn): We're allowing rename here, but we likely should let the user
// know that there is an error in the code and that rename results might be
// inaccurate.
return TokenRenameInfo.CreateSingleSymbolTokenInfo(symbolInfo.CandidateSymbols[0]);
}
return TokenRenameInfo.NoSymbolsTokenInfo;
}
public static IEnumerable<ISymbol> GetOverloadedSymbols(ISymbol symbol)
{
if (symbol is IMethodSymbol)
{
var containingType = symbol.ContainingType;
if (containingType.Kind == SymbolKind.NamedType)
{
foreach (var member in containingType.GetMembers())
{
if (string.Equals(member.MetadataName, symbol.MetadataName, StringComparison.Ordinal) && member is IMethodSymbol && !member.Equals(symbol))
{
yield return member;
}
}
}
}
}
public static async Task<ISymbol?> TryGetPropertyFromAccessorOrAnOverrideAsync(
ISymbol symbol, Solution solution, CancellationToken cancellationToken)
{
if (symbol.IsPropertyAccessor())
{
return ((IMethodSymbol)symbol).AssociatedSymbol;
}
if (symbol.IsOverride && symbol.GetOverriddenMember() != null)
{
var originalSourceSymbol = await SymbolFinder.FindSourceDefinitionAsync(
symbol.GetOverriddenMember(), solution, cancellationToken).ConfigureAwait(false);
if (originalSourceSymbol != null)
{
return await TryGetPropertyFromAccessorOrAnOverrideAsync(originalSourceSymbol, solution, cancellationToken).ConfigureAwait(false);
}
}
if (symbol.Kind == SymbolKind.Method &&
symbol.ContainingType.TypeKind == TypeKind.Interface)
{
var methodImplementors = await SymbolFinder.FindImplementationsAsync(
symbol, solution, cancellationToken: cancellationToken).ConfigureAwait(false);
foreach (var methodImplementor in methodImplementors)
{
var propertyAccessorOrAnOverride = await TryGetPropertyFromAccessorOrAnOverrideAsync(methodImplementor, solution, cancellationToken).ConfigureAwait(false);
if (propertyAccessorOrAnOverride != null)
{
return propertyAccessorOrAnOverride;
}
}
}
return null;
}
public static string ReplaceMatchingSubStrings(
string replaceInsideString,
string matchText,
string replacementText,
ImmutableSortedSet<TextSpan>? subSpansToReplace = null)
{
if (subSpansToReplace == null)
{
// We do not have already computed sub-spans to replace inside the string.
// Get regex for matches within the string and replace all matches with replacementText.
var regex = GetRegexForMatch(matchText);
return regex.Replace(replaceInsideString, replacementText);
}
else
{
// We are provided specific matches to replace inside the string.
// Process the input string from start to end, replacing matchText with replacementText
// at the provided sub-spans within the string for these matches.
var stringBuilder = new StringBuilder();
var startOffset = 0;
foreach (var subSpan in subSpansToReplace)
{
Debug.Assert(subSpan.Start <= replaceInsideString.Length);
Debug.Assert(subSpan.End <= replaceInsideString.Length);
// Verify that provided sub-span has a match with matchText.
if (replaceInsideString.Substring(subSpan.Start, subSpan.Length) != matchText)
continue;
// Append the sub-string from last match till the next match
var offset = subSpan.Start - startOffset;
stringBuilder.Append(replaceInsideString.Substring(startOffset, offset));
// Append the replacementText
stringBuilder.Append(replacementText);
// Update startOffset to process the next match.
startOffset += offset + subSpan.Length;
}
// Append the remaining of the sub-string within replaceInsideString after the last match.
stringBuilder.Append(replaceInsideString[startOffset..]);
return stringBuilder.ToString();
}
}
public static Regex GetRegexForMatch(string matchText)
{
var matchString = string.Format(@"\b{0}\b", matchText);
return new Regex(matchString, RegexOptions.CultureInvariant);
}
/// <summary>
/// Given a symbol in a document, returns the "right" symbol that should be renamed in
/// the case the name binds to things like aliases _and_ the underlying type at once.
/// </summary>
public static async Task<ISymbol?> TryGetRenamableSymbolAsync(
Document document, int position, CancellationToken cancellationToken)
{
var symbol = await SymbolFinder.FindSymbolAtPositionAsync(document, position, cancellationToken: cancellationToken).ConfigureAwait(false);
if (symbol == null)
return null;
var definitionSymbol = await FindDefinitionSymbolAsync(symbol, document.Project.Solution, cancellationToken).ConfigureAwait(false);
Contract.ThrowIfNull(definitionSymbol);
return definitionSymbol;
}
/// <summary>
/// Given a symbol, finds the symbol that actually defines the name that we're using.
/// </summary>
public static async Task<ISymbol> FindDefinitionSymbolAsync(
ISymbol symbol, Solution solution, CancellationToken cancellationToken)
{
Contract.ThrowIfNull(symbol);
Contract.ThrowIfNull(solution);
// Make sure we're on the original source definition if we can be
var foundSymbol = await SymbolFinder.FindSourceDefinitionAsync(
symbol, solution, cancellationToken).ConfigureAwait(false);
var bestSymbol = foundSymbol ?? symbol;
symbol = bestSymbol;
// If we're renaming a property, it might be a synthesized property for a method
// backing field.
if (symbol.Kind == SymbolKind.Parameter)
{
if (symbol.ContainingSymbol.Kind == SymbolKind.Method)
{
var containingMethod = (IMethodSymbol)symbol.ContainingSymbol;
if (containingMethod.AssociatedSymbol is IPropertySymbol)
{
var associatedPropertyOrEvent = (IPropertySymbol)containingMethod.AssociatedSymbol;
var ordinal = containingMethod.Parameters.IndexOf((IParameterSymbol)symbol);
if (ordinal < associatedPropertyOrEvent.Parameters.Length)
{
return associatedPropertyOrEvent.Parameters[ordinal];
}
}
}
}
// if we are renaming a compiler generated delegate for an event, cascade to the event
if (symbol.Kind == SymbolKind.NamedType)
{
var typeSymbol = (INamedTypeSymbol)symbol;
if (typeSymbol.IsImplicitlyDeclared && typeSymbol.IsDelegateType() && typeSymbol.AssociatedSymbol != null)
{
return typeSymbol.AssociatedSymbol;
}
}
// If we are renaming a constructor or destructor, we wish to rename the whole type
if (symbol.Kind == SymbolKind.Method)
{
var methodSymbol = (IMethodSymbol)symbol;
if (methodSymbol.MethodKind is MethodKind.Constructor or
MethodKind.StaticConstructor or
MethodKind.Destructor)
{
return methodSymbol.ContainingType;
}
}
// If we are renaming a backing field for a property, cascade to the property
if (symbol.Kind == SymbolKind.Field)
{
var fieldSymbol = (IFieldSymbol)symbol;
if (fieldSymbol.IsImplicitlyDeclared &&
fieldSymbol.AssociatedSymbol.IsKind(SymbolKind.Property))
{
return fieldSymbol.AssociatedSymbol;
}
}
// in case this is e.g. an overridden property accessor, we'll treat the property itself as the definition symbol
var property = await RenameUtilities.TryGetPropertyFromAccessorOrAnOverrideAsync(bestSymbol, solution, cancellationToken).ConfigureAwait(false);
return property ?? bestSymbol;
}
}
}
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