public override IReadOnlyList <RazorCompletionItem> GetCompletionItems(RazorSyntaxTree syntaxTree, TagHelperDocumentContext tagHelperDocumentContext, SourceSpan location)
{
if (syntaxTree is null)
{
throw new ArgumentNullException(nameof(syntaxTree));
}
if (tagHelperDocumentContext is null)
{
throw new ArgumentNullException(nameof(tagHelperDocumentContext));
}
var change = new SourceChange(location, string.Empty);
var owner = syntaxTree.Root.LocateOwner(change);
if (owner == null)
{
Debug.Fail("Owner should never be null.");
return(Array.Empty <RazorCompletionItem>());
}
var parent = owner.Parent;
if (_htmlFactsService.TryGetElementInfo(parent, out var containingTagNameToken, out var attributes) &&
containingTagNameToken.Span.IntersectsWith(location.AbsoluteIndex))
{
var stringifiedAttributes = _tagHelperFactsService.StringifyAttributes(attributes);
var elementCompletions = GetElementCompletions(parent, containingTagNameToken.Content, stringifiedAttributes, tagHelperDocumentContext);
return(elementCompletions);
}
if (_htmlFactsService.TryGetAttributeInfo(
parent,
out containingTagNameToken,
out var prefixLocation,
out var selectedAttributeName,
out var selectedAttributeNameLocation,
out attributes) &&
(selectedAttributeName == null ||
selectedAttributeNameLocation?.IntersectsWith(location.AbsoluteIndex) == true ||
(prefixLocation?.IntersectsWith(location.AbsoluteIndex) ?? false)))
{
var stringifiedAttributes = _tagHelperFactsService.StringifyAttributes(attributes);
var attributeCompletions = GetAttributeCompletions(parent, containingTagNameToken.Content, selectedAttributeName, stringifiedAttributes, tagHelperDocumentContext);
return(attributeCompletions);
}
// Invalid location for TagHelper completions.
return(Array.Empty <RazorCompletionItem>());
}
public override IReadOnlyList <RazorCompletionItem> GetCompletionItems(RazorSyntaxTree syntaxTree, TagHelperDocumentContext tagHelperDocumentContext, SourceSpan location)
{
if (syntaxTree is null)
{
throw new ArgumentNullException(nameof(syntaxTree));
}
var change = new SourceChange(location, string.Empty);
var owner = syntaxTree.Root.LocateOwner(change);
if (owner == null)
{
Debug.Fail("Owner should never be null.");
return(Array.Empty <RazorCompletionItem>());
}
if (!AtMarkupTransitionCompletionPoint(owner))
{
return(Array.Empty <RazorCompletionItem>());
}
var parent = owner.Parent;
// Also helps filter out edge cases like `< te` and `< te=""`
// (see comment in AtMarkupTransitionCompletionPoint)
if (!_htmlFactsService.TryGetElementInfo(parent, out var containingTagNameToken, out var attributes) ||
!containingTagNameToken.Span.IntersectsWith(location.AbsoluteIndex))
{
return(Array.Empty <RazorCompletionItem>());
}
var completions = new List <RazorCompletionItem>()
{
MarkupTransitionCompletionItem
};
return(completions);
}
public override IReadOnlyList <CompletionItem> GetCompletionsAt(SourceSpan location, RazorCodeDocument codeDocument)
{
if (codeDocument == null)
{
throw new ArgumentNullException(nameof(codeDocument));
}
var syntaxTree = codeDocument.GetSyntaxTree();
var change = new SourceChange(location, "");
var owner = syntaxTree.Root.LocateOwner(change);
if (owner == null)
{
Debug.Fail("Owner should never be null.");
return(Array.Empty <CompletionItem>());
}
var parent = owner.Parent;
if (_htmlFactsService.TryGetElementInfo(parent, out var containingTagNameToken, out var attributes) &&
containingTagNameToken.Span.IntersectsWith(location.AbsoluteIndex))
{
var stringifiedAttributes = _tagHelperFactsService.StringifyAttributes(attributes);
var elementCompletions = GetElementCompletions(parent, containingTagNameToken.Content, stringifiedAttributes, codeDocument);
return(elementCompletions);
}
if (_htmlFactsService.TryGetAttributeInfo(parent, out containingTagNameToken, out var selectedAttributeName, out attributes) &&
attributes.Span.IntersectsWith(location.AbsoluteIndex))
{
var stringifiedAttributes = _tagHelperFactsService.StringifyAttributes(attributes);
var attributeCompletions = GetAttributeCompletions(parent, containingTagNameToken.Content, selectedAttributeName, stringifiedAttributes, codeDocument);
return(attributeCompletions);
}
// Invalid location for TagHelper completions.
return(Array.Empty <CompletionItem>());
}
public override HoverModel GetHoverInfo(RazorCodeDocument codeDocument, SourceLocation location, ClientCapabilities clientCapabilities)
{
if (codeDocument is null)
{
throw new ArgumentNullException(nameof(codeDocument));
}
var syntaxTree = codeDocument.GetSyntaxTree();
var change = new SourceChange(location.AbsoluteIndex, length: 0, newText: "");
var owner = syntaxTree.Root.LocateOwner(change);
if (owner is null)
{
Debug.Fail("Owner should never be null.");
return(null);
}
var parent = owner.Parent;
var position = new Position(location.LineIndex, location.CharacterIndex);
var tagHelperDocumentContext = codeDocument.GetTagHelperContext();
var ancestors = owner.Ancestors();
var(parentTag, parentIsTagHelper) = _tagHelperFactsService.GetNearestAncestorTagInfo(ancestors);
if (_htmlFactsService.TryGetElementInfo(parent, out var containingTagNameToken, out var attributes) &&
containingTagNameToken.Span.IntersectsWith(location.AbsoluteIndex))
{
// Hovering over HTML tag name
var stringifiedAttributes = _tagHelperFactsService.StringifyAttributes(attributes);
var binding = _tagHelperFactsService.GetTagHelperBinding(
tagHelperDocumentContext,
containingTagNameToken.Content,
stringifiedAttributes,
parentTag: parentTag,
parentIsTagHelper: parentIsTagHelper);
if (binding is null)
{
// No matching tagHelpers, it's just HTML
return(null);
}
else
{
Debug.Assert(binding.Descriptors.Any());
var range = containingTagNameToken.GetRange(codeDocument.Source);
var result = ElementInfoToHover(binding.Descriptors, range, clientCapabilities);
return(result);
}
}
if (_htmlFactsService.TryGetAttributeInfo(parent, out containingTagNameToken, out _, out var selectedAttributeName, out var selectedAttributeNameLocation, out attributes) &&
selectedAttributeNameLocation?.IntersectsWith(location.AbsoluteIndex) == true)
{
// Hovering over HTML attribute name
var stringifiedAttributes = _tagHelperFactsService.StringifyAttributes(attributes);
var binding = _tagHelperFactsService.GetTagHelperBinding(
tagHelperDocumentContext,
containingTagNameToken.Content,
stringifiedAttributes,
parentTag: parentTag,
parentIsTagHelper: parentIsTagHelper);
if (binding is null)
{
// No matching TagHelpers, it's just HTML
return(null);
}
else
{
Debug.Assert(binding.Descriptors.Any());
var tagHelperAttributes = _tagHelperFactsService.GetBoundTagHelperAttributes(tagHelperDocumentContext, selectedAttributeName, binding);
// Grab the first attribute that we find that intersects with this location. That way if there are multiple attributes side-by-side aka hovering over:
// <input checked| minimized />
// Then we take the left most attribute (attributes are returned in source order).
var attribute = attributes.First(a => a.Span.IntersectsWith(location.AbsoluteIndex));
if (attribute is MarkupTagHelperAttributeSyntax thAttributeSyntax)
{
attribute = thAttributeSyntax.Name;
}
else if (attribute is MarkupMinimizedTagHelperAttributeSyntax thMinimizedAttribute)
{
attribute = thMinimizedAttribute.Name;
}
else if (attribute is MarkupTagHelperDirectiveAttributeSyntax directiveAttribute)
{
attribute = directiveAttribute.Name;
}
else if (attribute is MarkupMinimizedTagHelperDirectiveAttributeSyntax miniDirectiveAttribute)
{
attribute = miniDirectiveAttribute;
}
var attributeName = attribute.GetContent();
var range = attribute.GetRange(codeDocument.Source);
// Include the @ in the range
switch (attribute.Parent.Kind)
{
case SyntaxKind.MarkupTagHelperDirectiveAttribute:
var directiveAttribute = attribute.Parent as MarkupTagHelperDirectiveAttributeSyntax;
range.Start.Character -= directiveAttribute.Transition.FullWidth;
attributeName = "@" + attributeName;
break;
case SyntaxKind.MarkupMinimizedTagHelperDirectiveAttribute:
var minimizedAttribute = containingTagNameToken.Parent as MarkupMinimizedTagHelperDirectiveAttributeSyntax;
range.Start.Character -= minimizedAttribute.Transition.FullWidth;
attributeName = "@" + attributeName;
break;
}
var attributeHoverModel = AttributeInfoToHover(tagHelperAttributes, range, attributeName, clientCapabilities);
return(attributeHoverModel);
}
}
return(null);
}
public override IReadOnlyList <RazorCompletionItem> GetCompletionItems(RazorCompletionContext context, SourceSpan location)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
var change = new SourceChange(location, string.Empty);
var owner = context.SyntaxTree.Root.LocateOwner(change);
if (owner is null)
{
Debug.Fail("Owner should never be null.");
return(Array.Empty <RazorCompletionItem>());
}
var parent = owner.Parent;
if (_htmlFactsService.TryGetElementInfo(parent, out var containingTagNameToken, out var attributes) &&
containingTagNameToken.Span.IntersectsWith(location.AbsoluteIndex))
{
if ((containingTagNameToken.FullWidth > 1 || containingTagNameToken.Content == "-") &&
containingTagNameToken.Span.Start != location.AbsoluteIndex)
{
// To align with HTML completion behavior we only want to provide completion items if we're trying to resolve completion at the
// beginning of an HTML element name.
return(Array.Empty <RazorCompletionItem>());
}
var stringifiedAttributes = _tagHelperFactsService.StringifyAttributes(attributes);
var containingElement = parent.Parent;
var elementCompletions = GetElementCompletions(containingElement, containingTagNameToken.Content, stringifiedAttributes, context.TagHelperDocumentContext);
return(elementCompletions);
}
if (_htmlFactsService.TryGetAttributeInfo(
parent,
out containingTagNameToken,
out var prefixLocation,
out var selectedAttributeName,
out var selectedAttributeNameLocation,
out attributes) &&
(selectedAttributeName is null ||
selectedAttributeNameLocation?.IntersectsWith(location.AbsoluteIndex) == true ||
(prefixLocation?.IntersectsWith(location.AbsoluteIndex) ?? false)))
{
if (prefixLocation.HasValue &&
prefixLocation.Value.Length == 1 &&
selectedAttributeNameLocation.HasValue &&
selectedAttributeNameLocation.Value.Length > 1 &&
selectedAttributeNameLocation.Value.Start != location.AbsoluteIndex)
{
// To align with HTML completion behavior we only want to provide completion items if we're trying to resolve completion at the
// beginning of an HTML attribute name. We do extra checks on prefix locations here in order to rule out malformed cases when the Razor
// compiler incorrectly parses multi-line attributes while in the middle of typing out an element. For instance:
//
// <SurveyPrompt |
// @code { ... }
//
// Will be interpreted as having an `@code` attribute name due to multi-line attributes being a thing. Ultimately this is mostly a
// heuristic that we have to apply in order to workaround limitations of the Razor compiler.
return(Array.Empty <RazorCompletionItem>());
}
var stringifiedAttributes = _tagHelperFactsService.StringifyAttributes(attributes);
var attributeCompletions = GetAttributeCompletions(parent, containingTagNameToken.Content, selectedAttributeName, stringifiedAttributes, context.TagHelperDocumentContext, context.Options);
return(attributeCompletions);
}
// Invalid location for TagHelper completions.
return(Array.Empty <RazorCompletionItem>());
}
public override HoverModel GetHoverInfo(RazorCodeDocument codeDocument, SourceSpan location)
{
if (codeDocument is null)
{
throw new ArgumentNullException(nameof(codeDocument));
}
var syntaxTree = codeDocument.GetSyntaxTree();
var change = new SourceChange(location, "");
var owner = syntaxTree.Root.LocateOwner(change);
if (owner == null)
{
Debug.Fail("Owner should never be null.");
return(null);
}
var parent = owner.Parent;
var position = new Position(location.LineIndex, location.CharacterIndex);
var tagHelperDocumentContext = codeDocument.GetTagHelperContext();
var ancestors = owner.Ancestors();
var(parentTag, parentIsTagHelper) = _tagHelperFactsService.GetNearestAncestorTagInfo(ancestors);
if (_htmlFactsService.TryGetElementInfo(parent, out var containingTagNameToken, out var attributes) &&
containingTagNameToken.Span.IntersectsWith(location.AbsoluteIndex))
{
// Hovering over HTML tag name
var stringifiedAttributes = _tagHelperFactsService.StringifyAttributes(attributes);
var binding = _tagHelperFactsService.GetTagHelperBinding(
tagHelperDocumentContext,
containingTagNameToken.Content,
stringifiedAttributes,
parentTag: parentTag,
parentIsTagHelper: parentIsTagHelper);
if (binding is null)
{
// No matching tagHelpers, it's just HTML
return(null);
}
else
{
Debug.Assert(binding.Descriptors.Count() > 0);
var range = GetRangeFromSyntaxNode(containingTagNameToken, codeDocument);
var result = ElementInfoToHover(binding.Descriptors, range);
return(result);
}
}
if (_htmlFactsService.TryGetAttributeInfo(parent, out containingTagNameToken, out var selectedAttributeName, out attributes) &&
attributes.Span.IntersectsWith(location.AbsoluteIndex))
{
// Hovering over HTML attribute name
var stringifiedAttributes = _tagHelperFactsService.StringifyAttributes(attributes);
var binding = _tagHelperFactsService.GetTagHelperBinding(
tagHelperDocumentContext,
containingTagNameToken.Content,
stringifiedAttributes,
parentTag: parentTag,
parentIsTagHelper: parentIsTagHelper);
if (binding is null)
{
// No matching TagHelpers, it's just HTML
return(null);
}
else
{
Debug.Assert(binding.Descriptors.Count() > 0);
var tagHelperAttributes = _tagHelperFactsService.GetBoundTagHelperAttributes(tagHelperDocumentContext, selectedAttributeName, binding);
var attribute = attributes.Single(a => a.Span.IntersectsWith(location.AbsoluteIndex));
var range = GetRangeFromSyntaxNode(attribute, codeDocument);
var attributeHoverModel = AttributeInfoToHover(tagHelperAttributes, range);
return(attributeHoverModel);
}
}
return(null);
}