private DocumentationCommentTriviaSyntax ProcessTag(
DocumentationCommentTriviaSyntax documentationNode,
IMethodOrAccessorTransformationResult methodTransformResult,
string tagName,
Func <IMethodSymbol, string> addOrReplace,
Predicate <IMethodSymbol> canRemove,
bool prepend)
{
if (addOrReplace == null && canRemove == null)
{
return(documentationNode);
}
var methodSymbol = methodTransformResult.AnalyzationResult.Symbol;
var tagContent = addOrReplace?.Invoke(methodSymbol);
var removeTag = canRemove?.Invoke(methodSymbol);
var tagNode = documentationNode.Content.OfType <XmlElementSyntax>()
.FirstOrDefault(o => o.StartTag.Name.ToString() == tagName);
if (!string.IsNullOrEmpty(tagContent))
{
var indent = methodTransformResult.LeadingWhitespaceTrivia.ToFullString();
var eol = methodTransformResult.EndOfLineTrivia.ToFullString();
var tagComment = CreateTagContent(tagName, tagContent, indent, eol);
// When prepending a new tag before an existing tag we have to add the indentation at the end otherwise on start
if (prepend && tagNode == null && documentationNode.Content.Any())
{
var lastComment = tagComment.Content.Last();
tagComment = tagComment.ReplaceNode(lastComment, lastComment
.WithTrailingTrivia(lastComment.GetTrailingTrivia()
.Add(methodTransformResult.LeadingWhitespaceTrivia)));
}
else
{
var startComment = tagComment.Content.First();
tagComment = tagComment.ReplaceNode(startComment, startComment
.WithLeadingTrivia(DocumentationCommentExterior($"{indent}///")));
}
if (tagNode != null)
{
documentationNode = documentationNode.ReplaceNode(tagNode, tagComment.Content.OfType <XmlElementSyntax>().First());
}
else
{
documentationNode = documentationNode.WithContent(prepend
? documentationNode.Content.InsertRange(0, tagComment.Content)
: documentationNode.Content.AddRange(tagComment.Content));
}
}
else if (removeTag == true && tagNode != null)
{
// We need to remove the "///" XmlText and the tag itself
var index = documentationNode.Content.IndexOf(tagNode);
documentationNode = documentationNode.RemoveNode(tagNode, SyntaxRemoveOptions.KeepNoTrivia);
documentationNode = documentationNode.RemoveNode(documentationNode.Content[index - 1], SyntaxRemoveOptions.KeepNoTrivia);
}
return(documentationNode);
}
private static DocumentationCommentTriviaSyntax RemoveFilterPriorityElement(DocumentationCommentTriviaSyntax commentTrivia)
{
SyntaxList <XmlNodeSyntax> content = commentTrivia.Content;
for (int i = content.Count - 1; i >= 0; i--)
{
XmlNodeSyntax xmlNode = content[i];
if (xmlNode is XmlElementSyntax xmlElement &&
xmlElement.IsLocalName("filterpriority", StringComparison.OrdinalIgnoreCase))
{
content = content.RemoveAt(i);
}
}
return(commentTrivia.WithContent(content));
}
/// <summary>
/// Add <paramref name="summary"/> element to <paramref name="comment"/>
/// Replace if a summary element exists.
/// </summary>
/// <param name="comment">The <see cref="DocumentationCommentTriviaSyntax"/>.</param>
/// <param name="summary"> The <see cref="XmlElementSyntax"/>.</param>
/// <returns><paramref name="comment"/> with <paramref name="summary"/>.</returns>
public static DocumentationCommentTriviaSyntax WithSummary(this DocumentationCommentTriviaSyntax comment, XmlElementSyntax summary)
{
if (comment is null)
{
throw new ArgumentNullException(nameof(comment));
}
if (comment.TryGetSummary(out var old))
{
return(comment.ReplaceNode(old, summary));
}
if (comment.Content.TryFirstOfType(out XmlElementSyntax existing))
{
return(comment.InsertBefore(existing, summary));
}
return(comment.WithContent(comment.Content.Add(summary)));
}
private static DocumentationCommentTriviaSyntax RemoveFilterPriorityElement(DocumentationCommentTriviaSyntax commentTrivia)
{
SyntaxList <XmlNodeSyntax> content = commentTrivia.Content;
for (int i = content.Count - 1; i >= 0; i--)
{
XmlNodeSyntax xmlNode = content[i];
if (xmlNode.IsKind(SyntaxKind.XmlElement))
{
var xmlElement = (XmlElementSyntax)xmlNode;
if (xmlElement.IsLocalName("filterpriority", "FILTERPRIORITY"))
{
content = content.RemoveAt(i);
}
}
}
return(commentTrivia.WithContent(content));
}
private static DocumentationCommentTriviaSyntax RemoveFilterPriorityElement(DocumentationCommentTriviaSyntax commentTrivia)
{
SyntaxList <XmlNodeSyntax> content = commentTrivia.Content;
for (int i = content.Count - 1; i >= 0; i--)
{
XmlNodeSyntax xmlNode = content[i];
if (xmlNode.IsKind(SyntaxKind.XmlElement))
{
var xmlElement = (XmlElementSyntax)xmlNode;
string name = xmlElement.StartTag?.Name?.LocalName.ValueText;
if (string.Equals(name, "filterpriority", StringComparison.OrdinalIgnoreCase))
{
content = content.RemoveAt(i);
}
}
}
return(commentTrivia.WithContent(content));
}
private async Task <Document> GetTransformedDocumentAsync(Document document, Diagnostic diagnostic, CancellationToken cancellationToken)
{
var documentRoot = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
SyntaxNode syntax = documentRoot.FindNode(diagnostic.Location.SourceSpan);
if (syntax == null)
{
return(document);
}
PropertyDeclarationSyntax propertyDeclarationSyntax = syntax.FirstAncestorOrSelf <PropertyDeclarationSyntax>();
if (propertyDeclarationSyntax == null)
{
return(document);
}
DocumentationCommentTriviaSyntax documentationComment = propertyDeclarationSyntax.GetDocumentationCommentTriviaSyntax();
if (documentationComment == null)
{
return(document);
}
if (!(documentationComment.Content.GetFirstXmlElement(XmlCommentHelper.SummaryXmlTag) is XmlElementSyntax summaryElement))
{
return(document);
}
SyntaxList <XmlNodeSyntax> summaryContent = summaryElement.Content;
if (!this.TryRemoveSummaryPrefix(ref summaryContent, "Gets or sets "))
{
if (!this.TryRemoveSummaryPrefix(ref summaryContent, "Gets "))
{
this.TryRemoveSummaryPrefix(ref summaryContent, "Sets ");
}
}
SyntaxList <XmlNodeSyntax> content = summaryContent.WithoutFirstAndLastNewlines();
if (!string.IsNullOrWhiteSpace(content.ToFullString()))
{
// wrap the content in a <placeholder> element for review
content = XmlSyntaxFactory.List(XmlSyntaxFactory.PlaceholderElement(content));
}
string newLineText = document.Project.Solution.Workspace.Options.GetOption(FormattingOptions.NewLine, LanguageNames.CSharp);
XmlElementSyntax valueElement = XmlSyntaxFactory.MultiLineElement(XmlCommentHelper.ValueXmlTag, newLineText, content);
XmlNodeSyntax leadingNewLine = XmlSyntaxFactory.NewLine(newLineText);
// HACK: The formatter isn't working when contents are added to an existing documentation comment, so we
// manually apply the indentation from the last line of the existing comment to each new line of the
// generated content.
SyntaxTrivia exteriorTrivia = GetLastDocumentationCommentExteriorTrivia(documentationComment);
if (!exteriorTrivia.Token.IsMissing)
{
leadingNewLine = leadingNewLine.ReplaceExteriorTrivia(exteriorTrivia);
valueElement = valueElement.ReplaceExteriorTrivia(exteriorTrivia);
}
// Try to replace an existing <value> element if the comment contains one. Otherwise, add it as a new element.
SyntaxNode root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
SyntaxNode newRoot;
XmlNodeSyntax existingValue = documentationComment.Content.GetFirstXmlElement(XmlCommentHelper.ValueXmlTag);
if (existingValue != null)
{
newRoot = root.ReplaceNode(existingValue, valueElement);
}
else
{
DocumentationCommentTriviaSyntax newDocumentationComment = documentationComment.WithContent(
documentationComment.Content.InsertRange(
documentationComment.Content.Count - 1,
XmlSyntaxFactory.List(leadingNewLine, valueElement)));
newRoot = root.ReplaceNode(documentationComment, newDocumentationComment);
}
return(document.WithSyntaxRoot(newRoot));
}
private static async Task <Document> GetTransformedDocumentAsync(Document document, Diagnostic diagnostic, CancellationToken cancellationToken)
{
var documentRoot = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
SyntaxNode syntax = documentRoot.FindNode(diagnostic.Location.SourceSpan);
if (syntax == null)
{
return(document);
}
MethodDeclarationSyntax methodDeclarationSyntax = syntax.FirstAncestorOrSelf <MethodDeclarationSyntax>();
DelegateDeclarationSyntax delegateDeclarationSyntax = syntax.FirstAncestorOrSelf <DelegateDeclarationSyntax>();
if (methodDeclarationSyntax == null && delegateDeclarationSyntax == null)
{
return(document);
}
DocumentationCommentTriviaSyntax documentationComment =
methodDeclarationSyntax?.GetDocumentationCommentTriviaSyntax()
?? delegateDeclarationSyntax?.GetDocumentationCommentTriviaSyntax();
if (documentationComment == null)
{
return(document);
}
SemanticModel semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
bool isTask;
bool isAsynchronousTestMethod;
if (methodDeclarationSyntax != null)
{
isTask = IsTaskReturningMethod(semanticModel, methodDeclarationSyntax, cancellationToken);
isAsynchronousTestMethod = isTask && IsAsynchronousTestMethod(semanticModel, methodDeclarationSyntax, cancellationToken);
}
else
{
isTask = IsTaskReturningMethod(semanticModel, delegateDeclarationSyntax, cancellationToken);
isAsynchronousTestMethod = false;
}
XmlNodeSyntax returnsElement = documentationComment.Content.GetFirstXmlElement(XmlCommentHelper.ReturnsXmlTag) as XmlNodeSyntax;
if (returnsElement != null && !isTask)
{
// This code fix doesn't know how to do anything more than document Task-returning methods.
return(document);
}
SyntaxList <XmlNodeSyntax> content = XmlSyntaxFactory.List();
if (isTask)
{
content = content.Add(XmlSyntaxFactory.Text("A "));
content = content.Add(XmlSyntaxFactory.SeeElement(SyntaxFactory.TypeCref(SyntaxFactory.ParseTypeName("global::System.Threading.Tasks.Task"))).WithAdditionalAnnotations(Simplifier.Annotation));
string operationKind = isAsynchronousTestMethod ? "unit test" : "operation";
content = content.Add(XmlSyntaxFactory.Text($" representing the asynchronous {operationKind}."));
// wrap the generated content in a <placeholder> element for review.
content = XmlSyntaxFactory.List(XmlSyntaxFactory.PlaceholderElement(content));
}
// Try to replace an existing <returns> element if the comment contains one. Otherwise, add it as a new element.
SyntaxNode root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
SyntaxNode newRoot;
if (returnsElement != null)
{
XmlEmptyElementSyntax emptyElement = returnsElement as XmlEmptyElementSyntax;
if (emptyElement != null)
{
XmlElementSyntax updatedReturns = XmlSyntaxFactory.Element(XmlCommentHelper.ReturnsXmlTag, content)
.WithLeadingTrivia(returnsElement.GetLeadingTrivia())
.WithTrailingTrivia(returnsElement.GetTrailingTrivia());
newRoot = root.ReplaceNode(returnsElement, updatedReturns);
}
else
{
XmlElementSyntax updatedReturns = ((XmlElementSyntax)returnsElement).WithContent(content);
newRoot = root.ReplaceNode(returnsElement, updatedReturns);
}
}
else
{
string newLineText = document.Project.Solution.Workspace.Options.GetOption(FormattingOptions.NewLine, LanguageNames.CSharp);
returnsElement = XmlSyntaxFactory.Element(XmlCommentHelper.ReturnsXmlTag, content);
XmlNodeSyntax leadingNewLine = XmlSyntaxFactory.NewLine(newLineText);
// HACK: The formatter isn't working when contents are added to an existing documentation comment, so we
// manually apply the indentation from the last line of the existing comment to each new line of the
// generated content.
SyntaxTrivia exteriorTrivia = GetLastDocumentationCommentExteriorTrivia(documentationComment);
if (!exteriorTrivia.Token.IsMissing)
{
leadingNewLine = leadingNewLine.ReplaceExteriorTrivia(exteriorTrivia);
returnsElement = returnsElement.ReplaceExteriorTrivia(exteriorTrivia);
}
DocumentationCommentTriviaSyntax newDocumentationComment = documentationComment.WithContent(
documentationComment.Content.InsertRange(
documentationComment.Content.Count - 1,
XmlSyntaxFactory.List(leadingNewLine, returnsElement)));
newRoot = root.ReplaceNode(documentationComment, newDocumentationComment);
}
return(document.WithSyntaxRoot(newRoot));
}
private async Task <Document> CreateChangedDocument(CodeFixContext context, PropertyDeclarationSyntax propertyDeclarationSyntax, CancellationToken cancellationToken)
{
DocumentationCommentTriviaSyntax documentationComment = propertyDeclarationSyntax.GetDocumentationCommentTriviaSyntax();
if (documentationComment == null)
{
return(context.Document);
}
XmlElementSyntax summaryElement = (XmlElementSyntax)documentationComment.Content.GetFirstXmlElement("summary");
if (summaryElement == null)
{
return(context.Document);
}
SyntaxList <XmlNodeSyntax> summaryContent = summaryElement.Content;
XmlNodeSyntax firstContent = summaryContent.FirstOrDefault(IsContentElement);
XmlTextSyntax firstText = firstContent as XmlTextSyntax;
if (firstText != null)
{
string firstTextContent = string.Concat(firstText.DescendantTokens());
if (firstTextContent.TrimStart().StartsWith("Gets ", StringComparison.Ordinal))
{
// Find the token containing "Gets "
SyntaxToken getsToken = default(SyntaxToken);
foreach (SyntaxToken textToken in firstText.TextTokens)
{
if (textToken.IsMissing)
{
continue;
}
if (!textToken.Text.TrimStart().StartsWith("Gets ", StringComparison.Ordinal))
{
continue;
}
getsToken = textToken;
break;
}
if (!getsToken.IsMissing)
{
string text = getsToken.Text;
string valueText = getsToken.ValueText;
int index = text.IndexOf("Gets ");
if (index >= 0)
{
bool additionalCharacters = index + 5 < text.Length;
text = text.Substring(0, index)
+ (additionalCharacters ? char.ToUpperInvariant(text[index + 5]).ToString() : string.Empty)
+ text.Substring(index + (additionalCharacters ? (5 + 1) : 5));
}
index = valueText.IndexOf("Gets ");
if (index >= 0)
{
valueText = valueText.Remove(index, 5);
}
SyntaxToken replaced = SyntaxFactory.Token(getsToken.LeadingTrivia, getsToken.Kind(), text, valueText, getsToken.TrailingTrivia);
summaryContent = summaryContent.Replace(firstText, firstText.ReplaceToken(getsToken, replaced));
}
}
}
string defaultValueToken = "NullIfNotIncluded";
SemanticModel semanticModel = await context.Document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
IPropertySymbol propertySymbol = semanticModel.GetDeclaredSymbol(propertyDeclarationSyntax);
if (propertySymbol != null)
{
ITypeSymbol propertyType = propertySymbol.Type;
if (propertyType.IsImmutableArray())
{
defaultValueToken = "DefaultArrayIfNotIncluded";
}
}
XmlElementSyntax valueElement =
XmlSyntaxFactory.MultiLineElement(
"value",
XmlSyntaxFactory.List(
XmlSyntaxFactory.ParaElement(XmlSyntaxFactory.PlaceholderElement(summaryContent.WithoutFirstAndLastNewlines())),
XmlSyntaxFactory.NewLine(),
XmlSyntaxFactory.TokenElement(defaultValueToken)));
XmlNodeSyntax leadingNewLine = XmlSyntaxFactory.NewLine();
// HACK: The formatter isn't working when contents are added to an existing documentation comment, so we
// manually apply the indentation from the last line of the existing comment to each new line of the
// generated content.
SyntaxTrivia exteriorTrivia = GetLastDocumentationCommentExteriorTrivia(documentationComment);
if (!exteriorTrivia.Token.IsMissing)
{
leadingNewLine = leadingNewLine.ReplaceExteriorTrivia(exteriorTrivia);
valueElement = valueElement.ReplaceExteriorTrivia(exteriorTrivia);
}
DocumentationCommentTriviaSyntax newDocumentationComment = documentationComment.WithContent(
documentationComment.Content.InsertRange(documentationComment.Content.Count - 1,
XmlSyntaxFactory.List(
leadingNewLine,
valueElement)));
SyntaxNode root = await context.Document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
SyntaxNode newRoot = root.ReplaceNode(documentationComment, newDocumentationComment);
return(context.Document.WithSyntaxRoot(newRoot));
}
private async Task <Document> CreateChangedDocumentAsync(CodeFixContext context, DocumentationCommentTriviaSyntax documentationCommentTriviaSyntax, CancellationToken cancellationToken)
{
StringBuilder leadingTriviaBuilder = new StringBuilder();
SyntaxToken parentToken = documentationCommentTriviaSyntax.ParentTrivia.Token;
int documentationCommentIndex = parentToken.LeadingTrivia.IndexOf(documentationCommentTriviaSyntax.ParentTrivia);
for (int i = 0; i < documentationCommentIndex; i++)
{
SyntaxTrivia trivia = parentToken.LeadingTrivia[i];
switch (trivia.Kind())
{
case SyntaxKind.EndOfLineTrivia:
leadingTriviaBuilder.Clear();
break;
case SyntaxKind.WhitespaceTrivia:
leadingTriviaBuilder.Append(trivia.ToFullString());
break;
default:
break;
}
}
leadingTriviaBuilder.Append(documentationCommentTriviaSyntax.GetLeadingTrivia().ToFullString());
// this is the trivia that should appear at the beginning of each line of the comment.
SyntaxTrivia leadingTrivia = SyntaxFactory.DocumentationCommentExterior(leadingTriviaBuilder.ToString());
string newLineText = context.Document.Project.Solution.Workspace.Options.GetOption(FormattingOptions.NewLine, LanguageNames.CSharp);
var semanticModel = await context.Document.GetSemanticModelAsync(context.CancellationToken);
var documentedSymbol = semanticModel.GetDeclaredSymbol(parentToken.Parent.FirstAncestorOrSelf <SyntaxNode>(SyntaxNodeExtensionsEx.IsSymbolDeclaration), context.CancellationToken);
DocumentationCommentTriviaSyntax contentsOnly = RemoveExteriorTrivia(documentationCommentTriviaSyntax);
contentsOnly = contentsOnly.ReplaceNodes(contentsOnly.ChildNodes(), (originalNode, rewrittenNode) => RenderBlockElementAsMarkdown(originalNode, rewrittenNode, newLineText, documentedSymbol));
string renderedContent = contentsOnly.Content.ToFullString();
string[] lines = renderedContent.Split(new[] { "\r\n", "\n" }, StringSplitOptions.None);
SyntaxList <XmlNodeSyntax> newContent = XmlSyntaxFactory.List();
for (int i = 0; i < lines.Length; i++)
{
string line = lines[i];
if (string.IsNullOrWhiteSpace(line))
{
if (i == lines.Length - 1)
{
break;
}
line = string.Empty;
}
if (newContent.Count > 0)
{
newContent = newContent.Add(XmlSyntaxFactory.NewLine(newLineText).WithTrailingTrivia(SyntaxFactory.DocumentationCommentExterior("///")));
}
newContent = newContent.Add(XmlSyntaxFactory.Text(line.TrimEnd(), xmlEscape: false));
}
contentsOnly = contentsOnly.WithContent(newContent);
contentsOnly =
contentsOnly
.ReplaceExteriorTrivia(leadingTrivia)
.WithLeadingTrivia(SyntaxFactory.DocumentationCommentExterior("///"))
.WithTrailingTrivia(SyntaxFactory.EndOfLine(Environment.NewLine));
string fullContent = contentsOnly.ToFullString();
SyntaxTriviaList parsedTrivia = SyntaxFactory.ParseLeadingTrivia(fullContent);
SyntaxTrivia documentationTrivia = parsedTrivia.FirstOrDefault(i => i.IsKind(SyntaxKind.SingleLineDocumentationCommentTrivia));
contentsOnly = documentationTrivia.GetStructure() as DocumentationCommentTriviaSyntax;
if (contentsOnly == null)
{
return(context.Document);
}
// Remove unnecessary nested paragraph elements
contentsOnly = contentsOnly.ReplaceNodes(contentsOnly.DescendantNodes().OfType <XmlElementSyntax>(), MarkUnnecessaryParagraphs);
contentsOnly = contentsOnly.ReplaceNodes(contentsOnly.DescendantNodes().OfType <XmlElementSyntax>(), RemoveUnnecessaryParagraphs);
SyntaxNode root = await context.Document.GetSyntaxRootAsync(cancellationToken);
SyntaxNode newRoot = root.ReplaceNode(documentationCommentTriviaSyntax, contentsOnly);
if (documentationCommentTriviaSyntax.IsEquivalentTo(contentsOnly))
{
return(context.Document);
}
if (documentationCommentTriviaSyntax.ToFullString().Equals(contentsOnly.ToFullString(), StringComparison.Ordinal))
{
return(context.Document);
}
return(context.Document.WithSyntaxRoot(newRoot));
}