/// <summary>
/// If there was no $end$ token, place it at the end of the snippet code. Otherwise, it
/// defaults to the beginning of the snippet code.
/// </summary>
private static bool SetEndPositionIfNoneSpecified(IExpansionSession pSession)
{
if (pSession.GetSnippetNode() is not XElement snippetNode)
{
return(false);
}
var ns = snippetNode.Name.NamespaceName;
var codeNode = snippetNode.Element(XName.Get("Code", ns));
if (codeNode == null)
{
return(false);
}
var delimiterAttribute = codeNode.Attribute("Delimiter");
var delimiter = delimiterAttribute != null ? delimiterAttribute.Value : "$";
if (codeNode.Value.IndexOf(string.Format("{0}end{0}", delimiter), StringComparison.OrdinalIgnoreCase) != -1)
{
return(false);
}
var snippetSpan = pSession.GetSnippetSpan();
var newEndSpan = new SnapshotSpan(snippetSpan.End, 0);
pSession.EndSpan = newEndSpan;
return(true);
}
public void OnItemChosen(string title, string pszPath)
{
var textViewModel = TextView.TextViewModel;
if (textViewModel == null)
{
Debug.Assert(TextView.IsClosed);
return;
}
var textSpan = TextView.Caret.Position.BufferPosition;
var expansion = ExpansionServiceProvider.GetExpansionService(TextView);
earlyEndExpansionHappened = false;
ExpansionSession = expansion.InsertNamedExpansion(title, pszPath, new SnapshotSpan(textSpan, 0), this, LanguageServiceGuid, false);
if (earlyEndExpansionHappened)
{
// EndExpansion was called before InsertNamedExpansion returned, so set
// expansionSession to null to indicate that there is no active expansion
// session. This can occur when the snippet inserted doesn't have any expansion
// fields.
ExpansionSession = null;
earlyEndExpansionHappened = false;
}
}
public virtual bool TryInsertExpansion(int startPositionInSubjectBuffer, int endPositionInSubjectBuffer)
{
var textViewModel = TextView.TextViewModel;
if (textViewModel == null)
{
Debug.Assert(TextView.IsClosed);
return(false);
}
// The expansion itself needs to be created in the data buffer, so map everything up
_ = SubjectBuffer.CurrentSnapshot.GetPoint(startPositionInSubjectBuffer);
_ = SubjectBuffer.CurrentSnapshot.GetPoint(endPositionInSubjectBuffer);
if (!TryGetSpanOnHigherBuffer(
SubjectBuffer.CurrentSnapshot.GetSpan(startPositionInSubjectBuffer, endPositionInSubjectBuffer - startPositionInSubjectBuffer),
textViewModel.DataBuffer,
out var dataBufferSpan))
{
return(false);
}
var expansion = ExpansionServiceProvider.GetExpansionService(TextView);
ExpansionSession = expansion.InsertExpansion(dataBufferSpan, this, LanguageServiceGuid);
if (ExpansionSession == null)
{
return(false);
}
return(true);
}
public void EndExpansion()
{
if (ExpansionSession == null)
{
earlyEndExpansionHappened = true;
}
ExpansionSession = null;
indentCaretOnCommit = false;
}
public virtual bool TryHandleEscape()
{
if (ExpansionSession != null)
{
ExpansionSession.EndCurrentExpansion(leaveCaret: true);
ExpansionSession = null;
return(true);
}
return(false);
}
public virtual bool TryHandleReturn()
{
if (ExpansionSession != null)
{
// Only move the caret if the enter was hit within the snippet fields.
var hitWithinField = ExpansionSession.GoToNextExpansionField(commitIfLast: false);
ExpansionSession.EndCurrentExpansion(leaveCaret: !hitWithinField);
ExpansionSession = null;
return(hitWithinField);
}
return(false);
}
public virtual bool TryHandleBackTab()
{
if (ExpansionSession != null)
{
var tabbedInsideSnippetField = ExpansionSession.GoToPreviousExpansionField();
if (!tabbedInsideSnippetField)
{
ExpansionSession.EndCurrentExpansion(leaveCaret: true);
ExpansionSession = null;
}
return(tabbedInsideSnippetField);
}
return(false);
}
private void AddReferencesAndImports(
IExpansionSession pSession,
int position,
CancellationToken cancellationToken)
{
if (!(pSession.GetSnippetNode() is XElement snippetNode))
{
return;
}
var documentWithImports = this.SubjectBuffer.CurrentSnapshot.GetOpenDocumentInCurrentContextWithChanges();
if (documentWithImports == null)
{
return;
}
var documentOptions = documentWithImports.GetOptionsAsync(cancellationToken).WaitAndGetResult(cancellationToken);
var placeSystemNamespaceFirst = documentOptions.GetOption(GenerationOptions.PlaceSystemNamespaceFirst);
documentWithImports = AddImports(documentWithImports, position, snippetNode, placeSystemNamespaceFirst, cancellationToken);
AddReferences(documentWithImports.Project, snippetNode);
}
public void OnBeforeInsertion(IExpansionSession pSession)
{
Logger.Log(FunctionId.Snippet_OnBeforeInsertion);
this.ExpansionSession = pSession;
}
public void OnAfterInsertion(IExpansionSession pSession)
{
Logger.Log(FunctionId.Snippet_OnAfterInsertion);
}
