protected override ClassificationRefresh ProcessText(
ITextSnapshot snapshot,
Parser parseResult,
SharedTagList tagList,
bool writeAccess)
{
bool parsedCorrectly = parseResult.ParsedCorrectly;
if (writeAccess)
{
foreach (var token in parseResult.Tokens)
{
tagList.AddRange(this, QmlSyntaxTag.GetClassification(snapshot, token));
}
foreach (var node in parseResult.AstNodes)
{
tagList.AddRange(this, QmlSyntaxTag.GetClassification(snapshot, node));
}
}
if (parsedCorrectly)
{
return(ClassificationRefresh.FullText);
}
else
{
return(ClassificationRefresh.TagsOnly);
}
}
private void RefreshClassification(
ITextSnapshot snapshot,
ClassificationRefresh refresh,
SharedTagList tagList)
{
var tagsChangedHandler = TagsChanged;
if (refresh == ClassificationRefresh.FullText)
{
var span = new SnapshotSpan(Buffer.CurrentSnapshot,
0, Buffer.CurrentSnapshot.Length);
if (tagsChangedHandler != null)
{
tagsChangedHandler.Invoke(this, new SnapshotSpanEventArgs(span));
}
}
else
{
foreach (var tag in tagList.Values)
{
var tagMapped = tag.MapToSnapshot(snapshot);
if (tagsChangedHandler != null)
{
tagsChangedHandler.Invoke(this, new SnapshotSpanEventArgs(tagMapped.Span));
}
}
}
}
protected override ClassificationRefresh ProcessText(
ITextSnapshot snapshot,
Parser parseResult,
SharedTagList tagList,
bool writeAccess)
{
if (writeAccess)
{
var expressions = parseResult.AstNodes
.Where(x => x.Kind == AstNodeKind.FieldMemberExpression ||
x.Kind == AstNodeKind.IdentifierExpression)
.GroupBy(x => x.FirstSourceLocation.Offset)
.Select(x => new
{
Offset = x.Key,
Length = x.Max(y =>
y.LastSourceLocation.Offset + y.LastSourceLocation.Length) - x.Key,
List = x.OrderBy(y =>
y.LastSourceLocation.Offset + y.LastSourceLocation.Length)
});
tagList.AddRange(this, expressions
.Select(x => new ExprTrackingTag(snapshot, x.Offset, x.Length, x.List)));
}
return(ClassificationRefresh.FullText);
}
private void TextView_Closed(object sender, EventArgs e)
{
if (currentParserKey != null)
{
ParserStore.Instance.Release(this, currentParserKey);
currentParserKey = null;
}
if (currentTagListKey != null)
{
TagListStore.Instance.Release(this, currentTagListKey);
currentTagListKey = null;
}
currentTagList = null;
}
protected override ClassificationRefresh ProcessText(
ITextSnapshot snapshot,
Parser parseResult,
SharedTagList tagList,
bool writeAccess)
{
if (writeAccess)
{
foreach (var diag in parseResult.DiagnosticMessages)
{
tagList.Add(this, new QmlDiagnosticsTag(snapshot, diag));
}
}
return(ClassificationRefresh.FullText);
}
protected QmlAsyncClassifier(
string classificationType,
ITextView textView,
ITextBuffer buffer)
{
TextView = textView;
textView.Closed += TextView_Closed;
Buffer = buffer;
buffer.Changed += Buffer_Changed;
dispatcher = Dispatcher.CurrentDispatcher;
timer = new DispatcherTimer(DispatcherPriority.ApplicationIdle, dispatcher)
{
Interval = TimeSpan.FromMilliseconds(250)
};
timer.Tick += Timer_Tick;
currentParserKey = null;
currentTagListKey = null;
currentTagList = null;
this.classificationType = classificationType;
AsyncParse(buffer.CurrentSnapshot);
}
private async void AsyncParse(ITextSnapshot snapshot)
{
lock (criticalSection) {
if (flag)
{
return;
}
flag = true;
}
var newParserKey = new ParserKey(snapshot);
var newTagListKey = new TagListKey(classificationType, snapshot);
if (newParserKey == currentParserKey || newTagListKey == currentTagListKey)
{
return;
}
ParserKey oldParserKey = null;
TagListKey oldTagListKey = null;
await Task.Run(() =>
{
var parser = ParserStore.Instance.Get(this, newParserKey);
var tagList = TagListStore.Instance.Get(this, newTagListKey);
var refresh = ClassificationRefresh.FullText;
try {
var accessType = tagList.RequestWriteAccess(this);
refresh = ProcessText(snapshot, parser, tagList,
accessType == SharedTagList.AccessType.ReadWrite);
} finally {
tagList.WriteComplete(this);
}
oldParserKey = currentParserKey;
currentParserKey = newParserKey;
oldTagListKey = currentTagListKey;
currentTagListKey = newTagListKey;
currentTagList = tagList;
RefreshClassification(snapshot, refresh, tagList);
var currentVersion = Buffer.CurrentSnapshot.Version;
if (snapshot.Version.VersionNumber == currentVersion.VersionNumber)
{
timer.Stop();
}
else
{
timer.Start();
}
});
lock (criticalSection) {
flag = false;
}
await Task.Run(() =>
{
if (oldParserKey != null)
{
ParserStore.Instance.Release(this, oldParserKey);
}
if (oldTagListKey != null)
{
TagListStore.Instance.Release(this, oldTagListKey);
}
});
}
/// <summary>
/// Process QML source code. Implementations will override this method with the specific
/// processing required to convert the parser results into a list of tracking tags
/// </summary>
/// <param name="snapshot">The current version of the source code</param>
/// <param name="parseResult">The result of parsing the source code</param>
/// <param name="tagList">Shared list of tracking tags</param>
/// <param name="writeAccess">
/// If true, the instance is required to populate the list of tags;
/// otherwise, the instance has read-only access and cannot modify the list.
/// </param>
/// <returns>
/// Hint on how to notify Visual Studio concerning the tags in the list
/// FullText: refresh the entire contents of the text editor
/// TagsOnly: refresh only the spans pointed to by the tags
/// </returns>
protected abstract ClassificationRefresh ProcessText(
ITextSnapshot snapshot,
Parser parseResult,
SharedTagList tagList,
bool writeAccess);
