/// <summary>
/// Attempts to convert VS Completion trigger into Roslyn completion trigger
/// </summary>
/// <param name="trigger">VS completion trigger</param>
/// <param name="triggerLocation">Character.
/// VS provides Backspace and Delete characters inside the trigger while Roslyn needs the char deleted by the trigger.
/// Therefore, we provide this character separately and use it for Delete and Backspace cases only.
/// We retrieve this character from triggerLocation.
/// </param>
/// <returns>Roslyn completion trigger</returns>
internal static RoslynTrigger GetRoslynTrigger(AsyncCompletionData.CompletionTrigger trigger, SnapshotPoint triggerLocation)
{
switch (trigger.Reason)
{
case AsyncCompletionData.CompletionTriggerReason.InvokeAndCommitIfUnique:
return(new RoslynTrigger(CompletionTriggerKind.InvokeAndCommitIfUnique));
case AsyncCompletionData.CompletionTriggerReason.Insertion:
return(RoslynTrigger.CreateInsertionTrigger(trigger.Character));
case AsyncCompletionData.CompletionTriggerReason.Deletion:
case AsyncCompletionData.CompletionTriggerReason.Backspace:
var snapshotBeforeEdit = trigger.ViewSnapshotBeforeTrigger;
char characterRemoved;
if (triggerLocation.Position >= 0 && triggerLocation.Position < snapshotBeforeEdit.Length)
{
// If multiple characters were removed (selection), this finds the first character from the left.
characterRemoved = snapshotBeforeEdit[triggerLocation.Position];
}
else
{
characterRemoved = (char)0;
}
return(RoslynTrigger.CreateDeletionTrigger(characterRemoved));
case AsyncCompletionData.CompletionTriggerReason.SnippetsMode:
return(new RoslynTrigger(CompletionTriggerKind.Snippets));
default:
return(RoslynTrigger.Invoke);
}
}
/// <summary>
/// Attempts to convert VS Completion trigger into Roslyn completion trigger
/// </summary>
/// <param name="trigger">VS completion trigger</param>
/// <param name="triggerLocation">Character.
/// VS provides Backspace and Delete characters inside the trigger while Roslyn needs the char deleted by the trigger.
/// Therefore, we provide this character separately and use it for Delete and Backspace cases only.
/// We retrieve this character from triggerLocation.
/// </param>
/// <returns>Roslyn completion trigger</returns>
internal static RoslynTrigger GetRoslynTrigger(EditorAsyncCompletionData.CompletionTrigger trigger, SnapshotPoint triggerLocation)
{
var completionTriggerKind = GetRoslynTriggerKind(trigger);
if (completionTriggerKind == CompletionTriggerKind.Deletion)
{
var snapshotBeforeEdit = trigger.ViewSnapshotBeforeTrigger;
char characterRemoved;
if (triggerLocation.Position >= 0 && triggerLocation.Position < snapshotBeforeEdit.Length)
{
// If multiple characters were removed (selection), this finds the first character from the left.
characterRemoved = snapshotBeforeEdit[triggerLocation.Position];
}
else
{
characterRemoved = (char)0;
}
return(RoslynTrigger.CreateDeletionTrigger(characterRemoved));
}
else
{
return(new RoslynTrigger(completionTriggerKind, trigger.Character));
}
}