public int GetDataTipText(TextSpan[] pSpan, out string pbstrText)
{
if (!_wpfTextView.TextBuffer.ContentType.IsOfType(PythonCoreConstants.ContentType))
{
pbstrText = null;
return(VSConstants.E_NOTIMPL);
}
if (pSpan.Length != 1)
{
throw new ArgumentException("Array parameter should contain exactly one TextSpan", "pSpan");
}
// Adjust the span to expression boundaries.
var snapshot = _wpfTextView.TextSnapshot;
var start = LineAndColumnNumberToSnapshotPoint(snapshot, pSpan[0].iStartLine, pSpan[0].iStartIndex);
var end = LineAndColumnNumberToSnapshotPoint(snapshot, pSpan[0].iEndLine, pSpan[0].iEndIndex);
// If this is a zero-length span (which it usually is, unless there's selection), adjust it
// to cover one char to the right, since an empty span at the beginning of the expression does
// not count as belonging to that expression;
if (start == end && start.Position != snapshot.Length)
{
end += 1;
}
var snapshotSpan = new SnapshotSpan(start, end);
var trackingSpan = snapshot.CreateTrackingSpan(snapshotSpan.Span, SpanTrackingMode.EdgeExclusive);
var rep = new ReverseExpressionParser(snapshot, _wpfTextView.TextBuffer, trackingSpan);
var exprSpan = rep.GetExpressionRange(forCompletion: false);
string expr = null;
if (exprSpan != null)
{
SnapshotPointToLineAndColumnNumber(exprSpan.Value.Start, out pSpan[0].iStartLine, out pSpan[0].iStartIndex);
SnapshotPointToLineAndColumnNumber(exprSpan.Value.End, out pSpan[0].iEndLine, out pSpan[0].iEndIndex);
expr = VsProjectAnalyzer.ExpressionForDataTipAsync(
_serviceProvider,
_wpfTextView,
exprSpan.Value,
TimeSpan.FromSeconds(1.0)
).WaitAndUnwrapExceptions(Dispatcher.CurrentDispatcher);
}
else
{
// If it's not an expression, suppress the tip.
pbstrText = null;
return(VSConstants.E_FAIL);
}
return(_debugger.GetDataTipValue(_vsTextLines, pSpan, expr, out pbstrText));
}