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117 changes: 117 additions & 0 deletions
117
src/NSubstitute.Analyzers.CSharp/DiagnosticAnalyzers/SubstitutionNodeFinder.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using Microsoft.CodeAnalysis; | ||
| using Microsoft.CodeAnalysis.CSharp; | ||
| using Microsoft.CodeAnalysis.CSharp.Syntax; | ||
| using Microsoft.CodeAnalysis.Diagnostics; | ||
| using NSubstitute.Analyzers.CSharp.Extensions; | ||
| using NSubstitute.Analyzers.Shared.DiagnosticAnalyzers; | ||
|
|
||
| namespace NSubstitute.Analyzers.CSharp.DiagnosticAnalyzers | ||
| { | ||
| /// <summary> | ||
| /// Finds nodes which are considered to be a part of substitution call. For instance substitute.Bar().Returns(1) will return substitute.Bar() | ||
| /// </summary> | ||
| internal class SubstitutionNodeFinder : AbstractSubstitutionNodeFinder<InvocationExpressionSyntax> | ||
| { | ||
| public override IEnumerable<SyntaxNode> FindForWhenExpression(SyntaxNodeAnalysisContext syntaxNodeContext, InvocationExpressionSyntax whenInvocationExpression, IMethodSymbol whenInvocationSymbol = null) | ||
| { | ||
| if (whenInvocationExpression == null) | ||
| { | ||
| return Enumerable.Empty<SyntaxNode>(); | ||
| } | ||
|
|
||
| whenInvocationSymbol = whenInvocationSymbol ?? syntaxNodeContext.SemanticModel.GetSymbolInfo(whenInvocationExpression).Symbol as IMethodSymbol; | ||
|
|
||
| if (whenInvocationSymbol == null) | ||
| { | ||
| return Enumerable.Empty<SyntaxNode>(); | ||
| } | ||
|
|
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| var argumentExpression = whenInvocationSymbol.MethodKind == MethodKind.ReducedExtension | ||
| ? whenInvocationExpression.ArgumentList.Arguments.First().Expression | ||
| : whenInvocationExpression.ArgumentList.Arguments.Skip(1).First().Expression; | ||
|
|
||
| return FindForWhenExpression(syntaxNodeContext, argumentExpression); | ||
| } | ||
|
|
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| public override SyntaxNode FindForAndDoesExpression(SyntaxNodeAnalysisContext syntaxNodeContext, InvocationExpressionSyntax invocationExpression, IMethodSymbol invocationExpressionSymbol) | ||
| { | ||
| var parentInvocationExpression = invocationExpression?.GetParentInvocationExpression(); | ||
| if (parentInvocationExpression == null) | ||
| { | ||
| return null; | ||
| } | ||
|
|
||
| var symbol = syntaxNodeContext.SemanticModel.GetSymbolInfo(parentInvocationExpression); | ||
|
|
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| return symbol.Symbol is IMethodSymbol methodSymbol && methodSymbol.ReducedFrom == null | ||
| ? parentInvocationExpression.ArgumentList.Arguments.First().Expression | ||
| : parentInvocationExpression.Expression.DescendantNodes().First(); | ||
| } | ||
|
|
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| public override SyntaxNode FindForStandardExpression(InvocationExpressionSyntax invocationExpressionSyntax, IMethodSymbol invocationExpressionSymbol) | ||
| { | ||
| switch (invocationExpressionSymbol.MethodKind) | ||
| { | ||
| case MethodKind.ReducedExtension: | ||
| return invocationExpressionSyntax.Expression.DescendantNodes().First(); | ||
| case MethodKind.Ordinary: | ||
| return invocationExpressionSyntax.ArgumentList.Arguments.First().Expression; | ||
| default: | ||
| return null; | ||
| } | ||
| } | ||
|
|
||
| protected override InvocationExpressionSyntax GetParentInvocationExpression(InvocationExpressionSyntax invocationExpressionSyntax) | ||
| { | ||
| return invocationExpressionSyntax.GetParentInvocationExpression(); | ||
| } | ||
|
|
||
| private IEnumerable<SyntaxNode> FindForWhenExpression(SyntaxNodeAnalysisContext syntaxNodeContext, SyntaxNode argumentSyntax) | ||
| { | ||
| SyntaxNode body = null; | ||
| switch (argumentSyntax) | ||
| { | ||
| case SimpleLambdaExpressionSyntax simpleLambdaExpressionSyntax: | ||
| body = simpleLambdaExpressionSyntax.Body; | ||
| break; | ||
| case AnonymousFunctionExpressionSyntax anonymousFunctionExpressionSyntax: | ||
| body = anonymousFunctionExpressionSyntax.Body; | ||
| break; | ||
| case LocalFunctionStatementSyntax localFunctionStatementSyntax: | ||
| body = (SyntaxNode)localFunctionStatementSyntax.Body ?? localFunctionStatementSyntax.ExpressionBody; | ||
| break; | ||
| case MethodDeclarationSyntax methodDeclarationSyntax: | ||
| body = (SyntaxNode)methodDeclarationSyntax.Body ?? methodDeclarationSyntax.ExpressionBody; | ||
| break; | ||
| case IdentifierNameSyntax identifierNameSyntax: | ||
| var symbol = syntaxNodeContext.SemanticModel.GetSymbolInfo(identifierNameSyntax); | ||
| if (symbol.Symbol != null && symbol.Symbol.Locations.Any()) | ||
| { | ||
| var location = symbol.Symbol.Locations.First(); | ||
| var syntaxNode = location.SourceTree.GetRoot().FindNode(location.SourceSpan); | ||
|
|
||
| foreach (var expressionForAnalysis in FindForWhenExpression(syntaxNodeContext, syntaxNode)) | ||
| { | ||
| yield return expressionForAnalysis; | ||
| } | ||
| } | ||
|
|
||
| break; | ||
| } | ||
|
|
||
| if (body == null) | ||
| { | ||
| yield break; | ||
| } | ||
|
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| foreach (var invocationExpressionSyntax in body.DescendantNodes().Where(node => node.IsKind(SyntaxKind.SimpleMemberAccessExpression) || | ||
| node.IsKind(SyntaxKind.ElementAccessExpression))) | ||
| { | ||
| yield return invocationExpressionSyntax; | ||
| } | ||
| } | ||
| } | ||
| } |
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