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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.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeGeneration;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.Formatting;
using Microsoft.CodeAnalysis.LanguageService;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.IntroduceParameter
{
internal abstract partial class AbstractIntroduceParameterCodeRefactoringProvider<TExpressionSyntax, TInvocationExpressionSyntax, TObjectCreationExpressionSyntax, TIdentifierNameSyntax>
{
private class IntroduceParameterDocumentRewriter
{
private readonly AbstractIntroduceParameterCodeRefactoringProvider<TExpressionSyntax, TInvocationExpressionSyntax, TObjectCreationExpressionSyntax, TIdentifierNameSyntax> _service;
private readonly Document _originalDocument;
private readonly SyntaxGenerator _generator;
private readonly ISyntaxFactsService _syntaxFacts;
private readonly ISemanticFactsService _semanticFacts;
private readonly TExpressionSyntax _expression;
private readonly IMethodSymbol _methodSymbol;
private readonly SyntaxNode _containerMethod;
private readonly IntroduceParameterCodeActionKind _actionKind;
private readonly CodeGenerationOptionsProvider _fallbackOptions;
private readonly bool _allOccurrences;
public IntroduceParameterDocumentRewriter(
AbstractIntroduceParameterCodeRefactoringProvider<TExpressionSyntax, TInvocationExpressionSyntax, TObjectCreationExpressionSyntax, TIdentifierNameSyntax> service,
Document originalDocument,
TExpressionSyntax expression,
IMethodSymbol methodSymbol,
SyntaxNode containingMethod,
IntroduceParameterCodeActionKind selectedCodeAction,
CodeGenerationOptionsProvider fallbackOptions,
bool allOccurrences)
{
_service = service;
_originalDocument = originalDocument;
_generator = SyntaxGenerator.GetGenerator(originalDocument);
_syntaxFacts = originalDocument.GetRequiredLanguageService<ISyntaxFactsService>();
_semanticFacts = originalDocument.GetRequiredLanguageService<ISemanticFactsService>();
_expression = expression;
_methodSymbol = methodSymbol;
_containerMethod = containingMethod;
_actionKind = selectedCodeAction;
_allOccurrences = allOccurrences;
_fallbackOptions = fallbackOptions;
}
public async Task<SyntaxNode> RewriteDocumentAsync(Compilation compilation, Document document, List<SyntaxNode> invocations, CancellationToken cancellationToken)
{
var insertionIndex = GetInsertionIndex(compilation);
if (_actionKind is IntroduceParameterCodeActionKind.Overload or IntroduceParameterCodeActionKind.Trampoline)
{
return await ModifyDocumentInvocationsTrampolineOverloadAndIntroduceParameterAsync(
compilation, document, invocations, insertionIndex, cancellationToken).ConfigureAwait(false);
}
else
{
return await ModifyDocumentInvocationsAndIntroduceParameterAsync(
compilation, document, insertionIndex, invocations, cancellationToken).ConfigureAwait(false);
}
}
/// <summary>
/// Ties the identifiers within the expression back to their associated parameter.
/// </summary>
private async Task<Dictionary<TIdentifierNameSyntax, IParameterSymbol>> MapExpressionToParametersAsync(CancellationToken cancellationToken)
{
var nameToParameterDict = new Dictionary<TIdentifierNameSyntax, IParameterSymbol>();
var variablesInExpression = _expression.DescendantNodes().OfType<TIdentifierNameSyntax>();
var semanticModel = await _originalDocument.GetRequiredSemanticModelAsync(cancellationToken).ConfigureAwait(false);
foreach (var variable in variablesInExpression)
{
var symbol = semanticModel.GetSymbolInfo(variable, cancellationToken).Symbol;
if (symbol is IParameterSymbol parameterSymbol)
{
nameToParameterDict.Add(variable, parameterSymbol);
}
}
return nameToParameterDict;
}
/// <summary>
/// Gets the parameter name, if the expression's grandparent is a variable declarator then it just gets the
/// local declarations name. Otherwise, it generates a name based on the context of the expression.
/// </summary>
private async Task<string> GetNewParameterNameAsync(CancellationToken cancellationToken)
{
if (ShouldRemoveVariableDeclaratorContainingExpression(out var varDeclName, out _))
{
return varDeclName;
}
var semanticModel = await _originalDocument.GetRequiredSemanticModelAsync(cancellationToken).ConfigureAwait(false);
var semanticFacts = _originalDocument.GetRequiredLanguageService<ISemanticFactsService>();
return semanticFacts.GenerateNameForExpression(semanticModel, _expression, capitalize: false, cancellationToken);
}
/// <summary>
/// Determines if the expression's grandparent is a variable declarator and if so,
/// returns the name
/// </summary>
private bool ShouldRemoveVariableDeclaratorContainingExpression([NotNullWhen(true)] out string? varDeclName, [NotNullWhen(true)] out SyntaxNode? localDeclaration)
{
var declarator = _expression?.Parent?.Parent;
localDeclaration = null;
if (!_syntaxFacts.IsVariableDeclarator(declarator))
{
varDeclName = null;
return false;
}
localDeclaration = _service.GetLocalDeclarationFromDeclarator(declarator);
if (localDeclaration is null)
{
varDeclName = null;
return false;
}
// TODO: handle in the future
if (_syntaxFacts.GetVariablesOfLocalDeclarationStatement(localDeclaration).Count > 1)
{
varDeclName = null;
localDeclaration = null;
return false;
}
varDeclName = _syntaxFacts.GetIdentifierOfVariableDeclarator(declarator).ValueText;
return true;
}
/// <summary>
/// Goes through the parameters of the original method to get the location that the parameter
/// and argument should be introduced.
/// </summary>
private int GetInsertionIndex(Compilation compilation)
{
var parameterList = _syntaxFacts.GetParameterList(_containerMethod);
Contract.ThrowIfNull(parameterList);
var insertionIndex = 0;
foreach (var parameterSymbol in _methodSymbol.Parameters)
{
// Want to skip optional parameters, params parameters, and CancellationToken since they should be at
// the end of the list.
if (ShouldParameterBeSkipped(compilation, parameterSymbol))
{
insertionIndex++;
}
}
return insertionIndex;
}
/// <summary>
/// For the trampoline case, it goes through the invocations and adds an argument which is a
/// call to the extracted method.
/// Introduces a new method overload or new trampoline method.
/// Updates the original method site with a newly introduced parameter.
///
/// ****Trampoline Example:****
/// public void M(int x, int y)
/// {
/// int f = [|x * y|];
/// Console.WriteLine(f);
/// }
///
/// public void InvokeMethod()
/// {
/// M(5, 6);
/// }
///
/// ---------------------------------------------------->
///
/// public int GetF(int x, int y) // Generated method
/// {
/// return x * y;
/// }
///
/// public void M(int x, int y, int f)
/// {
/// Console.WriteLine(f);
/// }
///
/// public void InvokeMethod()
/// {
/// M(5, 6, GetF(5, 6)); //Fills in with call to generated method
/// }
///
/// -----------------------------------------------------------------------
/// ****Overload Example:****
/// public void M(int x, int y)
/// {
/// int f = [|x * y|];
/// Console.WriteLine(f);
/// }
///
/// public void InvokeMethod()
/// {
/// M(5, 6);
/// }
///
/// ---------------------------------------------------->
///
/// public void M(int x, int y) // Generated overload
/// {
/// M(x, y, x * y)
/// }
///
/// public void M(int x, int y, int f)
/// {
/// Console.WriteLine(f);
/// }
///
/// public void InvokeMethod()
/// {
/// M(5, 6);
/// }
/// </summary>
private async Task<SyntaxNode> ModifyDocumentInvocationsTrampolineOverloadAndIntroduceParameterAsync(Compilation compilation, Document currentDocument,
List<SyntaxNode> invocations, int insertionIndex, CancellationToken cancellationToken)
{
var invocationSemanticModel = await currentDocument.GetRequiredSemanticModelAsync(cancellationToken).ConfigureAwait(false);
var root = await currentDocument.GetRequiredSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var editor = new SyntaxEditor(root, _generator);
var parameterName = await GetNewParameterNameAsync(cancellationToken).ConfigureAwait(false);
var expressionParameterMap = await MapExpressionToParametersAsync(cancellationToken).ConfigureAwait(false);
// Creating a new method name by concatenating the parameter name that has been upper-cased.
var newMethodIdentifier = "Get" + parameterName.ToPascalCase();
var validParameters = _methodSymbol.Parameters.Intersect(expressionParameterMap.Values).ToImmutableArray();
if (_actionKind is IntroduceParameterCodeActionKind.Trampoline)
{
// Creating an empty map here to reuse so that we do not create a new dictionary for
// every single invocation.
var parameterToArgumentMap = new Dictionary<IParameterSymbol, int>();
foreach (var invocation in invocations)
{
var argumentListSyntax = _syntaxFacts.GetArgumentListOfInvocationExpression(invocation);
if (argumentListSyntax == null)
continue;
editor.ReplaceNode(argumentListSyntax, (currentArgumentListSyntax, _) =>
{
return GenerateNewArgumentListSyntaxForTrampoline(compilation, invocationSemanticModel,
parameterToArgumentMap, currentArgumentListSyntax, argumentListSyntax, invocation,
validParameters, parameterName, newMethodIdentifier, insertionIndex, cancellationToken);
});
}
}
// If you are at the original document, then also introduce the new method and introduce the parameter.
if (currentDocument.Id == _originalDocument.Id)
{
var newMethodNode = _actionKind is IntroduceParameterCodeActionKind.Trampoline
? await ExtractMethodAsync(validParameters, newMethodIdentifier, _generator, cancellationToken).ConfigureAwait(false)
: await GenerateNewMethodOverloadAsync(insertionIndex, _generator, cancellationToken).ConfigureAwait(false);
editor.InsertBefore(_containerMethod, newMethodNode);
await UpdateExpressionInOriginalFunctionAsync(editor, cancellationToken).ConfigureAwait(false);
var parameterType = await GetTypeOfExpressionAsync(cancellationToken).ConfigureAwait(false);
var parameter = _generator.ParameterDeclaration(parameterName, _generator.TypeExpression(parameterType));
editor.InsertParameter(_containerMethod, insertionIndex, parameter);
}
return editor.GetChangedRoot();
// Adds an argument which is an invocation of the newly created method to the callsites
// of the method invocations where a parameter was added.
// Example:
// public void M(int x, int y)
// {
// int f = [|x * y|];
// Console.WriteLine(f);
// }
//
// public void InvokeMethod()
// {
// M(5, 6);
// }
//
// ---------------------------------------------------->
//
// public int GetF(int x, int y)
// {
// return x * y;
// }
//
// public void M(int x, int y)
// {
// int f = x * y;
// Console.WriteLine(f);
// }
//
// public void InvokeMethod()
// {
// M(5, 6, GetF(5, 6)); // This is the generated invocation which is a new argument at the call site
// }
SyntaxNode GenerateNewArgumentListSyntaxForTrampoline(Compilation compilation, SemanticModel invocationSemanticModel,
Dictionary<IParameterSymbol, int> parameterToArgumentMap, SyntaxNode currentArgumentListSyntax,
SyntaxNode argumentListSyntax, SyntaxNode invocation, ImmutableArray<IParameterSymbol> validParameters,
string parameterName, string newMethodIdentifier, int insertionIndex, CancellationToken cancellationToken)
{
var invocationArguments = _syntaxFacts.GetArgumentsOfArgumentList(argumentListSyntax);
parameterToArgumentMap.Clear();
MapParameterToArgumentsAtInvocation(parameterToArgumentMap, invocationArguments, invocationSemanticModel, cancellationToken);
var currentInvocationArguments = _syntaxFacts.GetArgumentsOfArgumentList(currentArgumentListSyntax);
var requiredArguments = new List<SyntaxNode>();
foreach (var parameterSymbol in validParameters)
{
if (parameterToArgumentMap.TryGetValue(parameterSymbol, out var index))
{
requiredArguments.Add(currentInvocationArguments[index]);
}
}
var conditionalRoot = _syntaxFacts.GetRootConditionalAccessExpression(invocation);
var named = ShouldArgumentBeNamed(compilation, invocationSemanticModel, invocationArguments, insertionIndex, cancellationToken);
var newMethodInvocation = GenerateNewMethodInvocation(invocation, requiredArguments, newMethodIdentifier);
SeparatedSyntaxList<SyntaxNode> allArguments;
if (conditionalRoot is null)
{
allArguments = AddArgumentToArgumentList(currentInvocationArguments, newMethodInvocation, parameterName, insertionIndex, named);
}
else
{
// Conditional Access expressions are parents of invocations, so it is better to just replace the
// invocation in place then rebuild the tree structure.
var expressionsWithConditionalAccessors = conditionalRoot.ReplaceNode(invocation, newMethodInvocation);
allArguments = AddArgumentToArgumentList(currentInvocationArguments, expressionsWithConditionalAccessors, parameterName, insertionIndex, named);
}
return _service.UpdateArgumentListSyntax(currentArgumentListSyntax, allArguments);
}
}
private async Task<ITypeSymbol> GetTypeOfExpressionAsync(CancellationToken cancellationToken)
{
var semanticModel = await _originalDocument.GetRequiredSemanticModelAsync(cancellationToken).ConfigureAwait(false);
var typeSymbol = semanticModel.GetTypeInfo(_expression, cancellationToken).ConvertedType ?? semanticModel.Compilation.ObjectType;
return typeSymbol;
}
private SyntaxNode GenerateNewMethodInvocation(SyntaxNode invocation, List<SyntaxNode> arguments, string newMethodIdentifier)
{
var methodName = _generator.IdentifierName(newMethodIdentifier);
var fullExpression = _syntaxFacts.GetExpressionOfInvocationExpression(invocation);
if (_syntaxFacts.IsMemberAccessExpression(fullExpression))
{
var receiverExpression = _syntaxFacts.GetExpressionOfMemberAccessExpression(fullExpression);
methodName = _generator.MemberAccessExpression(receiverExpression, newMethodIdentifier);
}
else if (_syntaxFacts.IsMemberBindingExpression(fullExpression))
{
methodName = _generator.MemberBindingExpression(_generator.IdentifierName(newMethodIdentifier));
}
return _generator.InvocationExpression(methodName, arguments);
}
/// <summary>
/// Generates a method declaration containing a return expression of the highlighted expression.
/// Example:
/// public void M(int x, int y)
/// {
/// int f = [|x * y|];
/// }
///
/// ---------------------------------------------------->
///
/// public int GetF(int x, int y)
/// {
/// return x * y;
/// }
///
/// public void M(int x, int y)
/// {
/// int f = x * y;
/// }
/// </summary>
private async Task<SyntaxNode> ExtractMethodAsync(ImmutableArray<IParameterSymbol> validParameters, string newMethodIdentifier, SyntaxGenerator generator, CancellationToken cancellationToken)
{
// Remove trivia so the expression is in a single line and does not affect the spacing of the following line
var returnStatement = generator.ReturnStatement(_expression.WithoutTrivia());
var typeSymbol = await GetTypeOfExpressionAsync(cancellationToken).ConfigureAwait(false);
var newMethodDeclaration = await CreateMethodDeclarationAsync(returnStatement,
validParameters, newMethodIdentifier, typeSymbol, isTrampoline: true, cancellationToken).ConfigureAwait(false);
return newMethodDeclaration;
}
/// <summary>
/// Generates a method declaration containing a call to the method that introduced the parameter.
/// Example:
///
/// ***This is an intermediary step in which the original function has not be updated yet
/// public void M(int x, int y)
/// {
/// int f = [|x * y|];
/// }
///
/// ---------------------------------------------------->
///
/// public void M(int x, int y) // Generated overload
/// {
/// M(x, y, x * y);
/// }
///
/// public void M(int x, int y) // Original function (which will be mutated in a later step)
/// {
/// int f = x * y;
/// }
/// </summary>
private async Task<SyntaxNode> GenerateNewMethodOverloadAsync(int insertionIndex, SyntaxGenerator generator, CancellationToken cancellationToken)
{
// Need the parameters from the original function as arguments for the invocation
var arguments = generator.CreateArguments(_methodSymbol.Parameters);
// Remove trivia so the expression is in a single line and does not affect the spacing of the following line
arguments = arguments.Insert(insertionIndex, generator.Argument(_expression.WithoutTrivia()));
var memberName = _methodSymbol.IsGenericMethod
? generator.GenericName(_methodSymbol.Name, _methodSymbol.TypeArguments)
: generator.IdentifierName(_methodSymbol.Name);
var invocation = generator.InvocationExpression(memberName, arguments);
var newStatement = _methodSymbol.ReturnsVoid
? generator.ExpressionStatement(invocation)
: generator.ReturnStatement(invocation);
var newMethodDeclaration = await CreateMethodDeclarationAsync(newStatement,
validParameters: null, newMethodIdentifier: null, typeSymbol: null, isTrampoline: false, cancellationToken).ConfigureAwait(false);
return newMethodDeclaration;
}
private async Task<SyntaxNode> CreateMethodDeclarationAsync(SyntaxNode newStatement, ImmutableArray<IParameterSymbol>? validParameters,
string? newMethodIdentifier, ITypeSymbol? typeSymbol, bool isTrampoline, CancellationToken cancellationToken)
{
var info = await _originalDocument.GetCodeGenerationInfoAsync(CodeGenerationContext.Default, _fallbackOptions, cancellationToken).ConfigureAwait(false);
var newMethod = isTrampoline
? CodeGenerationSymbolFactory.CreateMethodSymbol(_methodSymbol, name: newMethodIdentifier, parameters: validParameters, statements: ImmutableArray.Create(newStatement), returnType: typeSymbol)
: CodeGenerationSymbolFactory.CreateMethodSymbol(_methodSymbol, statements: ImmutableArray.Create(newStatement), containingType: _methodSymbol.ContainingType);
var newMethodDeclaration = info.Service.CreateMethodDeclaration(newMethod, CodeGenerationDestination.Unspecified, info, cancellationToken);
Contract.ThrowIfNull(newMethodDeclaration);
return newMethodDeclaration;
}
/// <summary>
/// This method goes through all the invocation sites and adds a new argument with the expression to be added.
/// It also introduces a parameter at the original method site.
///
/// Example:
/// public void M(int x, int y)
/// {
/// int f = [|x * y|];
/// }
///
/// public void InvokeMethod()
/// {
/// M(5, 6);
/// }
///
/// ---------------------------------------------------->
///
/// public void M(int x, int y, int f) // parameter gets introduced
/// {
/// }
///
/// public void InvokeMethod()
/// {
/// M(5, 6, 5 * 6); // argument gets added to callsite
/// }
/// </summary>
private async Task<SyntaxNode> ModifyDocumentInvocationsAndIntroduceParameterAsync(Compilation compilation, Document document, int insertionIndex,
List<SyntaxNode> invocations, CancellationToken cancellationToken)
{
var root = await document.GetRequiredSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var editor = new SyntaxEditor(root, _generator);
var invocationSemanticModel = await document.GetRequiredSemanticModelAsync(cancellationToken).ConfigureAwait(false);
var parameterToArgumentMap = new Dictionary<IParameterSymbol, int>();
var expressionToParameterMap = await MapExpressionToParametersAsync(cancellationToken).ConfigureAwait(false);
var parameterName = await GetNewParameterNameAsync(cancellationToken).ConfigureAwait(false);
foreach (var invocation in invocations)
{
var expressionEditor = new SyntaxEditor(_expression, _generator);
var argumentListSyntax = invocation is TObjectCreationExpressionSyntax
? _syntaxFacts.GetArgumentListOfObjectCreationExpression(invocation)
: _syntaxFacts.GetArgumentListOfInvocationExpression(invocation);
if (argumentListSyntax == null)
continue;
var invocationArguments = _syntaxFacts.GetArgumentsOfArgumentList(argumentListSyntax);
if (insertionIndex > invocationArguments.Count)
continue;
parameterToArgumentMap.Clear();
MapParameterToArgumentsAtInvocation(parameterToArgumentMap, invocationArguments, invocationSemanticModel, cancellationToken);
if (argumentListSyntax is not null)
{
editor.ReplaceNode(argumentListSyntax, (currentArgumentListSyntax, _) =>
{
var updatedInvocationArguments = _syntaxFacts.GetArgumentsOfArgumentList(currentArgumentListSyntax);
var updatedExpression = CreateNewArgumentExpression(expressionEditor, expressionToParameterMap, parameterToArgumentMap, updatedInvocationArguments);
var named = ShouldArgumentBeNamed(compilation, invocationSemanticModel, invocationArguments, insertionIndex, cancellationToken);
var allArguments = AddArgumentToArgumentList(updatedInvocationArguments,
updatedExpression.WithAdditionalAnnotations(Formatter.Annotation), parameterName, insertionIndex, named);
return _service.UpdateArgumentListSyntax(currentArgumentListSyntax, allArguments);
});
}
}
// If you are at the original document, then also introduce the new method and introduce the parameter.
if (document.Id == _originalDocument.Id)
{
await UpdateExpressionInOriginalFunctionAsync(editor, cancellationToken).ConfigureAwait(false);
var parameterType = await GetTypeOfExpressionAsync(cancellationToken).ConfigureAwait(false);
var parameter = _generator.ParameterDeclaration(name: parameterName, type:
_generator.TypeExpression(parameterType));
editor.InsertParameter(_containerMethod, insertionIndex, parameter);
}
return editor.GetChangedRoot();
}
/// <summary>
/// This method iterates through the variables in the expression and maps the variables back to the parameter
/// it is associated with. It then maps the parameter back to the argument at the invocation site and gets the
/// index to retrieve the updated arguments at the invocation.
/// </summary>
private TExpressionSyntax CreateNewArgumentExpression(SyntaxEditor editor,
Dictionary<TIdentifierNameSyntax, IParameterSymbol> mappingDictionary,
Dictionary<IParameterSymbol, int> parameterToArgumentMap,
SeparatedSyntaxList<SyntaxNode> updatedInvocationArguments)
{
foreach (var (variable, mappedParameter) in mappingDictionary)
{
var parameterMapped = parameterToArgumentMap.TryGetValue(mappedParameter, out var index);
if (parameterMapped)
{
var updatedInvocationArgument = updatedInvocationArguments[index];
var argumentExpression = _syntaxFacts.GetExpressionOfArgument(updatedInvocationArgument);
var parenthesizedArgumentExpression = editor.Generator.AddParentheses(argumentExpression, includeElasticTrivia: false);
editor.ReplaceNode(variable, parenthesizedArgumentExpression);
}
else if (mappedParameter.HasExplicitDefaultValue)
{
var generatedExpression = _service.GenerateExpressionFromOptionalParameter(mappedParameter);
var parenthesizedGeneratedExpression = editor.Generator.AddParentheses(generatedExpression, includeElasticTrivia: false);
editor.ReplaceNode(variable, parenthesizedGeneratedExpression);
}
}
return (TExpressionSyntax)editor.GetChangedRoot();
}
/// <summary>
/// If the parameter is optional and the invocation does not specify the parameter, then
/// a named argument needs to be introduced.
/// </summary>
private SeparatedSyntaxList<SyntaxNode> AddArgumentToArgumentList(
SeparatedSyntaxList<SyntaxNode> invocationArguments, SyntaxNode newArgumentExpression,
string parameterName, int insertionIndex, bool named)
{
var argument = named
? _generator.Argument(parameterName, RefKind.None, newArgumentExpression)
: _generator.Argument(newArgumentExpression);
return invocationArguments.Insert(insertionIndex, argument);
}
private bool ShouldArgumentBeNamed(Compilation compilation, SemanticModel semanticModel,
SeparatedSyntaxList<SyntaxNode> invocationArguments, int methodInsertionIndex,
CancellationToken cancellationToken)
{
var invocationInsertIndex = 0;
foreach (var invocationArgument in invocationArguments)
{
var argumentParameter = _semanticFacts.FindParameterForArgument(semanticModel, invocationArgument, cancellationToken);
if (argumentParameter is not null && ShouldParameterBeSkipped(compilation, argumentParameter))
{
invocationInsertIndex++;
}
else
{
break;
}
}
return invocationInsertIndex < methodInsertionIndex;
}
private static bool ShouldParameterBeSkipped(Compilation compilation, IParameterSymbol parameter)
=> !parameter.HasExplicitDefaultValue &&
!parameter.IsParams &&
!parameter.Type.Equals(compilation.GetTypeByMetadataName(typeof(CancellationToken)?.FullName!));
private void MapParameterToArgumentsAtInvocation(
Dictionary<IParameterSymbol, int> mapping, SeparatedSyntaxList<SyntaxNode> arguments,
SemanticModel invocationSemanticModel, CancellationToken cancellationToken)
{
for (var i = 0; i < arguments.Count; i++)
{
var argumentParameter = _semanticFacts.FindParameterForArgument(invocationSemanticModel, arguments[i], cancellationToken);
if (argumentParameter is not null)
{
mapping[argumentParameter] = i;
}
}
}
/// <summary>
/// Gets the matches of the expression and replaces them with the identifier.
/// Special case for the original matching expression, if its parent is a LocalDeclarationStatement then it can
/// be removed because assigning the local dec variable to a parameter is repetitive. Does not need a rename
/// annotation since the user has already named the local declaration.
/// Otherwise, it needs to have a rename annotation added to it because the new parameter gets a randomly
/// generated name that the user can immediately change.
/// </summary>
private async Task UpdateExpressionInOriginalFunctionAsync(SyntaxEditor editor, CancellationToken cancellationToken)
{
var generator = editor.Generator;
var matches = await FindMatchesAsync(cancellationToken).ConfigureAwait(false);
var parameterName = await GetNewParameterNameAsync(cancellationToken).ConfigureAwait(false);
var replacement = (TIdentifierNameSyntax)generator.IdentifierName(parameterName);
foreach (var match in matches)
{
// Special case the removal of the originating expression to either remove the local declaration
// or to add a rename annotation.
if (!match.Equals(_expression))
{
editor.ReplaceNode(match, replacement);
}
else
{
if (ShouldRemoveVariableDeclaratorContainingExpression(out _, out var localDeclaration))
{
editor.RemoveNode(localDeclaration);
}
else
{
// Found the initially selected expression. Replace it with the new name we choose, but also annotate
// that name with the RenameAnnotation so a rename session is started where the user can pick their
// own preferred name.
replacement = (TIdentifierNameSyntax)generator.IdentifierName(generator.Identifier(parameterName)
.WithAdditionalAnnotations(RenameAnnotation.Create()));
editor.ReplaceNode(match, replacement);
}
}
}
}
/// <summary>
/// Finds the matches of the expression within the same block.
/// </summary>
private async Task<IEnumerable<TExpressionSyntax>> FindMatchesAsync(CancellationToken cancellationToken)
{
if (!_allOccurrences)
{
return SpecializedCollections.SingletonEnumerable(_expression);
}
var syntaxFacts = _originalDocument.GetRequiredLanguageService<ISyntaxFactsService>();
var originalSemanticModel = await _originalDocument.GetRequiredSemanticModelAsync(cancellationToken).ConfigureAwait(false);
var matches = from nodeInCurrent in _containerMethod.DescendantNodesAndSelf().OfType<TExpressionSyntax>()
where NodeMatchesExpression(originalSemanticModel, nodeInCurrent, cancellationToken)
select nodeInCurrent;
return matches;
}
private bool NodeMatchesExpression(SemanticModel originalSemanticModel, TExpressionSyntax currentNode, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
if (currentNode == _expression)
{
return true;
}
return SemanticEquivalence.AreEquivalent(
originalSemanticModel, originalSemanticModel, _expression, currentNode);
}
}
}
}
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