private static IDeclaredElement FindDeclaredElement([NotNull] IPsiView psiView)
{
var referenceExpression = psiView.GetSelectedTreeNode <IReferenceExpression>();
if (referenceExpression != null)
{
return(referenceExpression.Reference.Resolve().DeclaredElement);
}
var identifier = psiView.GetSelectedTreeNode <ICSharpIdentifier>();
if (identifier != null)
{
var referenceName = ReferenceNameNavigator.GetByNameIdentifier(identifier);
if (referenceName != null)
{
return(referenceName.Reference.Resolve().DeclaredElement);
}
var declarationUnderCaret =
FieldDeclarationNavigator.GetByNameIdentifier(identifier) ??
PropertyDeclarationNavigator.GetByNameIdentifier(identifier) ??
MethodDeclarationNavigator.GetByNameIdentifier(identifier) ??
ConstructorDeclarationNavigator.GetByTypeName(identifier) ??
CSharpTypeDeclarationNavigator.GetByNameIdentifier(identifier) ??
EventDeclarationNavigator.GetByNameIdentifier(identifier) ??
ConstantDeclarationNavigator.GetByNameIdentifier(identifier) ??
VariableDeclarationNavigator.GetByNameIdentifier(identifier);
return(declarationUnderCaret?.DeclaredElement);
}
var predefinedTypeUsage = psiView.GetSelectedTreeNode <IPredefinedTypeUsage>();
return(predefinedTypeUsage?.ScalarPredefinedTypeName.Reference.Resolve().DeclaredElement);
}
private static MemberGenerationContext TryBuildMemberGenerationContext(
[NotNull] CSharpCodeCompletionContext context)
{
var identifier = context.TerminatedContext.TreeNode as ICSharpIdentifier;
if (identifier == null)
{
return(null);
}
// override int __
var fieldDeclaration = FieldDeclarationNavigator.GetByNameIdentifier(identifier);
if (fieldDeclaration != null)
{
var fieldTypeUsage =
fieldDeclaration.GetPreviousMeaningfulSiblingThroughWhitespaceAndComments() as ITypeUsage;
if (fieldTypeUsage == null)
{
return(null);
}
if (!CheckNodesBeforeTypeUsage(fieldTypeUsage, out var modifiersList))
{
return(null);
}
var memberReplaceRanges = ComputeMemberReplaceRanges(TreeOffset.InvalidOffset);
if (memberReplaceRanges == null)
{
return(null);
}
var typeDeclaration = GetPhysicalNonStaticTypeDeclaration();
if (typeDeclaration == null)
{
return(null);
}
if (modifiersList.ContainsPreprocessorDirectiveChildren())
{
return(null);
}
return(new MemberGenerationContext(typeDeclaration, modifiersList, fieldTypeUsage, memberReplaceRanges));
}
// override __;
var referenceName = ReferenceNameNavigator.GetByNameIdentifier(identifier);
var userTypeUsage = UserTypeUsageNavigator.GetByScalarTypeName(referenceName);
var methodDeclaration = MethodDeclarationNavigator.GetByTypeUsage(userTypeUsage);
if (methodDeclaration != null)
{
if (!CheckNodesBeforeTypeUsage(userTypeUsage, out var modifiersList))
{
return(null);
}
var methodStartRange =
context.TerminatedContext.ToOriginalTreeRange(
new TreeTextRange(methodDeclaration.GetTreeStartOffset()));
var memberReplaceRanges = ComputeMemberReplaceRanges(methodStartRange.StartOffset);
if (memberReplaceRanges == null)
{
return(null);
}
var typeDeclaration = GetPhysicalNonStaticTypeDeclaration();
if (typeDeclaration == null)
{
return(null);
}
if (modifiersList.ContainsPreprocessorDirectiveChildren())
{
return(null);
}
return(new MemberGenerationContext(typeDeclaration, modifiersList, expectedReturnTypeUsage: null,
memberReplaceRanges));
}
return(null);
bool CheckNodesBeforeTypeUsage(ITypeUsage typeUsage, out IModifiersList modifiersList)
{
var previousSibling = typeUsage.GetPreviousMeaningfulSiblingThroughWhitespaceAndComments();
modifiersList = previousSibling as IModifiersList;
if (previousSibling is IModifiersList)
{
previousSibling = previousSibling.GetPreviousMeaningfulSiblingThroughWhitespaceAndComments();
}
if (previousSibling is IAttributeSectionList)
{
previousSibling = previousSibling.GetPreviousMeaningfulSiblingThroughWhitespaceAndComments();
}
if (previousSibling is IDocCommentBlock)
{
previousSibling = previousSibling.GetPreviousMeaningfulSiblingThroughWhitespaceAndComments();
}
return(previousSibling == null);
}
bool IsDeclarationToReplace(ITreeNode declaration)
{
switch (declaration)
{
case IMultipleFieldDeclaration _:
case IMethodDeclaration _:
case IPropertyDeclaration _:
case IIndexerDeclaration _:
return(true);
default:
return(false);
}
}
TextLookupRanges ComputeMemberReplaceRanges(TreeOffset startOffset)
{
foreach (var treeNode in context.NodeInFile.ContainingNodes(returnThis: true))
{
if (IsDeclarationToReplace(treeNode))
{
return(RangesForDeclaration(treeNode));
}
if (treeNode.IsFiltered())
{
var prevMeaningfulSibling = treeNode.GetPreviousMeaningfulSiblingThroughWhitespaceAndComments();
if (prevMeaningfulSibling != null &&
IsDeclarationToReplace(prevMeaningfulSibling) &&
(!startOffset.IsValid() || prevMeaningfulSibling.GetTreeStartOffset() >= startOffset))
{
return(RangesForDeclaration(prevMeaningfulSibling));
}
var nextMeaningfulSibling = treeNode.GetNextMeaningfulSibling();
if (nextMeaningfulSibling != null && IsDeclarationToReplace(nextMeaningfulSibling))
{
return(RangesForDeclaration(nextMeaningfulSibling));
}
}
if (treeNode is IFieldDeclaration field)
{
var range = context.CompletionRanges.ReplaceRange;
if (field.GetPreviousMeaningfulSibling() is ITypeUsage typeUsage)
{
range = range.SetStartTo(typeUsage.GetDocumentStartOffset());
}
return(new TextLookupRanges(range, range));
}
if (treeNode is ICSharpTypeMemberDeclaration)
{
return(context.CompletionRanges);
}
}
return(null);
TextLookupRanges RangesForDeclaration(ITreeNode treeNode)
{
var elementRange = ComputeReplaceRangeForDeclaration(treeNode);
if (!elementRange.IsValid())
{
return(null);
}
return(CodeCompletionContextProviderBase.GetTextLookupRanges(context.BasicContext, elementRange));
}
DocumentRange ComputeReplaceRangeForDeclaration(ITreeNode declaration)
{
var startOffsetRange = new DocumentRange(GetDeclarationStartDocumentOffset(declaration));
var selectedRange = context.BasicContext.SelectedRange;
var anchorDeclaration = GetAnchorDeclaration(declaration);
var elementRange = startOffsetRange.Join(selectedRange)
.JoinRight(new DocumentRange(anchorDeclaration.GetDocumentEndOffset()));
if (!elementRange.IsValid())
{
elementRange = startOffsetRange.Join(selectedRange);
}
if (!elementRange.IsValid())
{
return(DocumentRange.InvalidRange);
}
var anchorDeclarationNameRange = GetDeclarationNameRange(anchorDeclaration);
var declarationNameLine = anchorDeclarationNameRange.StartOffset.ToDocumentCoords().Line;
var selectionLine = selectedRange.EndOffset.ToDocumentCoords().Line;
if (declarationNameLine != selectionLine)
{
return(elementRange.SetEndTo(selectedRange.EndOffset));
}
return(elementRange);
}
DocumentOffset GetDeclarationStartDocumentOffset(ITreeNode declaration)
{
// note: do not include attributes into member range
var firstChild = declaration.GetNextMeaningfulChild(null);
if (firstChild is IDocCommentBlock)
{
firstChild = firstChild.GetNextMeaningfulSibling();
}
if (firstChild is IAttributeSectionList)
{
firstChild = firstChild.GetNextMeaningfulSibling();
}
return((firstChild ?? declaration).GetDocumentStartOffset());
}
ITreeNode GetAnchorDeclaration(ITreeNode declaration)
{
if (declaration is IMethodDeclaration unfinishedMethod &&
unfinishedMethod.NameIdentifier == null &&
unfinishedMethod.LPar == null &&
unfinishedMethod.ModifiersList == null &&
unfinishedMethod.TypeUsage != null)
{
var nextDeclaration = unfinishedMethod.GetNextMeaningfulSibling();
if (IsDeclarationToReplace(nextDeclaration))
{
return(nextDeclaration);
}
}
return(declaration);
}
DocumentRange GetDeclarationNameRange(ITreeNode declaration)
{
switch (declaration)
{
case IMultipleFieldDeclaration fieldDecl:
return(fieldDecl.DeclaratorsEnumerable.FirstOrDefault().GetDocumentRange());
case IDeclaration decl:
return(decl.GetNameDocumentRange());
default:
return(declaration.GetDocumentRange());
}
}
}
ITypeDeclaration GetPhysicalNonStaticTypeDeclaration()
{
foreach (var typeDeclaration in context.NodeInFile.ContainingNodes <ITypeDeclaration>())
{
if (typeDeclaration.GetNameRange().EndOffset > context.BasicContext.CaretTreeOffset)
{
continue;
}
switch (typeDeclaration)
{
case IClassDeclaration classDeclaration when !classDeclaration.IsStatic:
return(classDeclaration);
case IStructDeclaration structDeclaration:
return(structDeclaration);
default:
return(null);
}
}
return(null);
}
}