public void SnapshotSpanSourceCodeReaderTest() {
var text = "hello world\r\nHello again!";
var buffer = new MockTextBuffer(text);
var snapshot = new MockTextSnapshot(buffer, text);
var reader = new SnapshotSpanSourceCodeReader(new SnapshotSpan(snapshot, new Span(0, text.Length)));
Assert.AreEqual(reader.Snapshot, snapshot);
Assert.AreEqual(reader.Position, 0);
var line = reader.ReadLine();
Assert.AreEqual(line, "hello world");
line = reader.ReadLine();
Assert.AreEqual(line, "Hello again!");
reader = new SnapshotSpanSourceCodeReader(new SnapshotSpan(snapshot, new Span(0, text.Length)));
int ch = reader.Peek();
Assert.AreEqual(ch, (int)'h');
char[] readBuf = new char[text.Length];
reader.Read(readBuf, 0, readBuf.Length);
Assert.AreEqual(new string(readBuf), text);
reader = new SnapshotSpanSourceCodeReader(new SnapshotSpan(snapshot, new Span(0, text.Length)));
Assert.AreEqual(reader.ReadToEnd(), text);
reader.Reset();
Assert.AreEqual(reader.ReadToEnd(), text);
reader.Close();
Assert.AreEqual(reader.Snapshot, null);
}
public void DiskBufferChanged(object sender, TextContentChangedEventArgs e)
{
foreach (var change in e.Changes)
{
int closest;
if (TryGetSingleStartSpan(e, change, out closest))
{
var closestSpan = _spans[closest];
int recalcPosition = -1;
bool recalc = false;
if (closestSpan.Kind == TemplateTokenKind.Text)
{
// we're in a section of HTML or whatever language the actual template is being applied to.
// First, check and see if the user has just pasted some code which includes a template,
// in which case we'll recalculate everything.
if (!(recalc = ContainsTemplateMarkup(change)))
{
// Then see if they inserted/deleted text creates a template tag by being merged
// with the text around us.
if (change.NewSpan.Start != 0 && change.NewSpan.End < e.After.Length)
{
// Check if the character before us plus the inserted character(s) makes a template tag
var newText = e.After.GetText(new Span(change.NewSpan.Start - 1, 2));
if (Array.IndexOf(_templateTags, newText) != -1)
{
if (closest != 0)
{
recalcPosition = _spans[--closest].DiskBufferSpan.GetStartPoint(e.After);
}
else
{
recalcPosition = _spans[closest].DiskBufferSpan.GetStartPoint(e.After);
}
recalc = true;
}
}
if (!recalc && change.NewSpan.End >= 2)
{
// check if we inserted template tags at the end
var newText = e.After.GetText(new Span(change.NewSpan.End - 2, 2));
if (Array.IndexOf(_templateTags, newText) != -1)
{
if (closest != 0)
{
recalcPosition = _spans[--closest].DiskBufferSpan.GetStartPoint(e.After);
}
else
{
recalcPosition = _spans[closest].DiskBufferSpan.GetStartPoint(e.After);
}
recalc = true;
}
}
if (!recalc && change.NewSpan.Start + 2 <= e.After.Length)
{
// check if the inserted char plus the char after us makes a template tag
var newText = e.After.GetText(new Span(change.NewSpan.Start, 2));
if (Array.IndexOf(_templateTags, newText) != -1)
{
if (closest != 0)
{
recalcPosition = _spans[--closest].DiskBufferSpan.GetStartPoint(e.After);
}
else
{
recalcPosition = _spans[closest].DiskBufferSpan.GetStartPoint(e.After);
}
recalc = true;
}
}
}
if (!recalc &&
change.NewSpan.Start == closestSpan.DiskBufferSpan.GetStartPoint(e.After) &&
change.NewSpan.Length == 0)
{
// finally, if we are just deleting code (change.NewSpan.Length == 0 indicates there's no insertions) from
// the start of the buffer then we are definitely deleting a } which means we need to re-calc. We know
// we're deleting the } because it's the last char in the buffer before us because it has
// to be the end of a template.
closestSpan = _spans[0];
closest = 0;
recalc = true;
}
}
else
{
// check if the newly inserted text makes a tag, we include the character before
// our span and the character after.
Span changeBounds = change.NewSpan;
if (changeBounds.Start > 0)
{
changeBounds = new Span(changeBounds.Start - 1, changeBounds.Length + 1);
}
if (changeBounds.End < e.After.Length)
{
changeBounds = new Span(changeBounds.Start, changeBounds.Length + 1);
}
var newText = e.After.GetText(changeBounds);
foreach (var tag in _templateTags)
{
if (newText.Contains(tag))
{
recalc = true;
break;
}
}
if (!recalc)
{
var templateStart = closestSpan.DiskBufferSpan.GetStartPoint(e.After);
if (change.NewSpan.Start <= templateStart + 1 ||
change.NewSpan.End == closestSpan.DiskBufferSpan.GetEndPoint(e.After) - 1)
{
// we are altering one of the 1st two characters or the last character.
// Because we're a template that could be messing us up.
// We recalcuate from the previous text buffer
// because the act of deleting this character could have turned us into a text
// buffer, and we need to replace and extend the previous text buffer.
recalcPosition = _spans[--closest].DiskBufferSpan.GetStartPoint(e.After);
recalc = true;
}
}
}
if (recalc)
{
var start = recalcPosition != -1 ? recalcPosition : closestSpan.DiskBufferSpan.GetStartPoint(e.After).Position;
var reader = new SnapshotSpanSourceCodeReader(new SnapshotSpan(e.After, Span.FromBounds(start, e.After.Length)));
UpdateTemplateSpans(reader, closest, start);
}
else if (closestSpan.Kind == TemplateTokenKind.Block)
{
// re-parse the block
_spans[closest] = new SpanInfo(
closestSpan.DiskBufferSpan,
closestSpan.Kind,
DjangoBlock.Parse(closestSpan.DiskBufferSpan.GetText(closestSpan.DiskBufferSpan.TextBuffer.CurrentSnapshot))
);
}
}
else
{
UpdateTemplateSpans(new StringReader(e.After.GetText()));
}
}
}