private static async Task<Document> ConvertExpressionSut(Document contextDocument,
InvocationExpressionSyntax thatNode, CancellationToken cancellationToken)
{
var sut = thatNode.ArgumentList.Arguments[0].Expression;
var actualCheck = NFluentAnalyzer.FindActualCheck(thatNode);
if (sut is BinaryExpressionSyntax binaryExpressionSyntax &&
(actualCheck.HasName("IsTrue") || actualCheck.HasName("IsFalse")))
{
var checkName =
NFluentAnalyzer.BinaryExpressionSutParser(binaryExpressionSyntax, out var realSut,
out var refValue);
// can we fix this ?
if (!string.IsNullOrEmpty(checkName))
{
// use the 'sut' as 'That's argument
ExpressionSyntax altThat = thatNode.Update(thatNode.Expression, RoslynHelper.BuildArgumentList(realSut));
if (actualCheck.HasName("IsFalse"))
{
// inject 'Not'
altThat = SyntaxFactory.MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression, altThat,
SyntaxFactory.IdentifierName("Not"));
}
// inject the fixed 'That'
var updatedCheckThat = actualCheck.ReplaceNode(thatNode, altThat);
// inject the proper check name
var altCheckNaMme = updatedCheckThat.Update(updatedCheckThat.Expression,
updatedCheckThat.OperatorToken,
SyntaxFactory.IdentifierName(checkName));
// inject the parameter
var newFix = ((InvocationExpressionSyntax)actualCheck.Parent).Update(altCheckNaMme, RoslynHelper.BuildArgumentList(refValue));
// inject the fixed check
var root = await contextDocument.GetSyntaxRootAsync(cancellationToken);
return contextDocument.WithSyntaxRoot(root.ReplaceNode(actualCheck.Parent, newFix));
}
}
return contextDocument;
}
private static async Task<Document> ConvertEnumerableCheck(Document contextDocument, InvocationExpressionSyntax thatNode, CancellationToken cancellationToken)
{
var sut = thatNode.ArgumentList.Arguments[0].Expression;
var actualCheck = NFluentAnalyzer.FindActualCheck(thatNode);
if (sut is MemberAccessExpressionSyntax memberAccess && memberAccess.HasName("Count"))
{
if (actualCheck.HasName("IsEqualTo"))
{
// replace Check.That(sut.Count).IsEqualTo(10) by Check.That(sut).CountIs(10)
var fixedThat = thatNode.Update(thatNode.Expression,
RoslynHelper.BuildArgumentList(memberAccess.Expression));
var fixedCheck = actualCheck.Update(actualCheck.Expression.ReplaceNode(thatNode, fixedThat),
actualCheck.OperatorToken, SyntaxFactory.IdentifierName("CountIs"));
var root = await contextDocument.GetSyntaxRootAsync(cancellationToken);
return contextDocument.WithSyntaxRoot(root.ReplaceNode(actualCheck, fixedCheck));
}
}
return contextDocument;
}
public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
var root = await context.Document.GetSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);
foreach (var contextDiagnostic in context.Diagnostics)
{
var invocationExpression = root.FindToken(contextDiagnostic.Location.SourceSpan.Start).Parent
.AncestorsAndSelf()
.OfType<ExpressionStatementSyntax>().First();
var thatNode =
NFluentAnalyzer.FindInvocationOfThat(await context.Document.GetSemanticModelAsync(context.CancellationToken),
invocationExpression);
if (thatNode == null)
{
return;
}
switch (contextDiagnostic.Id)
{
case NFluentAnalyzer.MissingCheckId:
FixMissingCheck(context, thatNode, contextDiagnostic);
break;
case NFluentAnalyzer.SutIsTheCheckId:
context.RegisterCodeFix(
CodeAction.Create(CodeFixResources.ExpandBinaryExpressionTitle,
c => ConvertExpressionSut(context.Document, thatNode, c),
nameof(CodeFixResources.ExpandBinaryExpressionTitle)),
contextDiagnostic);
break;
case NFluentAnalyzer.EnumerationCheckId:
context.RegisterCodeFix(CodeAction.Create(CodeFixResources.SwitchToEnumerableCheck,
c => ConvertEnumerableCheck(context.Document, thatNode, c),
nameof(CodeFixResources.SwitchToEnumerableCheck)),
contextDiagnostic);
break;
}
}
}