private void UpdateTemplateSpans(TextReader reader, int startSpan = 0, int offset = 0)
{
var tokenizer = new TemplateTokenizer(reader);
TemplateToken? token;
List <object> newProjectionSpans = new List <object>(); // spans in the projection buffer
List <SpanInfo> newSpanInfos = new List <SpanInfo>(); // our SpanInfo's, with spans in the on-disk buffer
while ((token = tokenizer.GetNextToken()) != null)
{
var curToken = token.Value;
var sourceSpan = Span.FromBounds(curToken.Start + offset, curToken.End + offset + 1);
switch (curToken.Kind)
{
case TemplateTokenKind.Block:
case TemplateTokenKind.Comment:
case TemplateTokenKind.Variable:
// template spans are setup to not grow. We'll track the edits and update their
// text if something causes them to grow.
if (newSpanInfos.Count == 0 && startSpan == 0)
{
// insert a zero-length span which will grow if the user inserts before the template tag
var emptySpan = new CustomTrackingSpan(
_diskBuffer.CurrentSnapshot,
new Span(0, 0),
PointTrackingMode.Negative,
PointTrackingMode.Positive
);
newProjectionSpans.Add(emptySpan);
newSpanInfos.Add(new SpanInfo(emptySpan, TemplateTokenKind.Text));
}
newSpanInfos.Add(
new SpanInfo(
new CustomTrackingSpan(
_diskBuffer.CurrentSnapshot,
sourceSpan,
PointTrackingMode.Positive,
PointTrackingMode.Negative
),
curToken.Kind,
curToken.Kind == TemplateTokenKind.Block ?
DjangoBlock.Parse(_diskBuffer.CurrentSnapshot.GetText(sourceSpan)) :
null
)
);
newProjectionSpans.Add(
new CustomTrackingSpan(
_templateBuffer.CurrentSnapshot,
sourceSpan,
PointTrackingMode.Positive,
PointTrackingMode.Negative
)
);
break;
case TemplateTokenKind.Text:
var htmlSpan = _htmlBuffer.CurrentSnapshot.Version.CreateCustomTrackingSpan(
sourceSpan,
TrackingFidelityMode.Forward,
new LanguageSpanCustomState(sourceSpan.Start, sourceSpan.End),
TrackToVersion
);
var diskSpan = _diskBuffer.CurrentSnapshot.Version.CreateCustomTrackingSpan(
sourceSpan,
TrackingFidelityMode.Forward,
new LanguageSpanCustomState(sourceSpan.Start, sourceSpan.End),
TrackToVersion
);
newProjectionSpans.Add(htmlSpan);
newSpanInfos.Add(new SpanInfo(diskSpan, TemplateTokenKind.Text));
break;
}
}
if (newSpanInfos.Count == 0 || newSpanInfos[newSpanInfos.Count - 1].Kind != TemplateTokenKind.Text)
{
// insert an empty span at the end which will receive new text.
var emptySpan = _diskBuffer.CurrentSnapshot.Version.CreateCustomTrackingSpan(
new Span(_diskBuffer.CurrentSnapshot.Length, 0),
TrackingFidelityMode.Forward,
new LanguageSpanCustomState(_diskBuffer.CurrentSnapshot.Length, _diskBuffer.CurrentSnapshot.Length),
TrackToVersion
);
newProjectionSpans.Add(emptySpan);
newSpanInfos.Add(new SpanInfo(emptySpan, TemplateTokenKind.Text));
}
var oldSpanCount = _spans.Count;
_spans.RemoveRange(startSpan, oldSpanCount - startSpan);
_spans.AddRange(newSpanInfos);
_projBuffer.ReplaceSpans(startSpan, oldSpanCount - startSpan, newProjectionSpans, _editOptions, null);
ProjectionClassifier classifier;
if (newSpanInfos.Count > 0 &&
_projBuffer.Properties.TryGetProperty <ProjectionClassifier>(typeof(ProjectionClassifier), out classifier))
{
classifier.RaiseClassificationChanged(
newSpanInfos[0].DiskBufferSpan.GetStartPoint(_diskBuffer.CurrentSnapshot),
newSpanInfos[newSpanInfos.Count - 1].DiskBufferSpan.GetEndPoint(_diskBuffer.CurrentSnapshot)
);
}
}
