private void ParseBufferChanges(INormalizedTextChangeCollection textChanges, ITextSnapshot textSnapshot)
{
// We must feed the GLSLTagSpanCollection ALL tagSpans, old and new, and it will determine what the appropriate differences are
var tokenBuilder = new TokenBuilder(_buffer);
var statementBuilder = new StatementBuilder(textSnapshot);
// Returns any tagspans from our original set (before the text changed) that intersects in any way with our text changes
_statements.Translate(textSnapshot);
_commentTagger.Translate(textSnapshot);
//_bracketTagger.Translate(textSnapshot);
_variableTagger.Translate(textSnapshot);
_functionTagger.Translate(textSnapshot);
foreach (var textChange in textChanges)
{
// "Reprocess" statement here instead, so we can track which statements and spans we are removing
var preprocessorSpan = _statements.ReprocessPreprocessors(textChange.NewPosition, textChange.NewEnd);
_commentTagger.Remove(preprocessorSpan);
// Need to translate and remove redundant spans from VariableTagger, FunctionTagger
var statementSpan = _statements.ReprocessStatements(textChange.NewPosition, textChange.NewEnd);
_variableTagger.Remove(statementSpan);
_functionTagger.Remove(statementSpan);
var span = Span.FromBounds(Math.Min(preprocessorSpan.Start, statementSpan.Start), Math.Max(preprocessorSpan.End, statementSpan.End));
// For now, we can just determine to RE-PARSE the entirety of the current statement that we are in
// This is easy enough, but we ALSO need to remove any tag spans that relate to this statement, since we don't want to end up re-adding those tag spans
if (tokenBuilder.Position <= span.Start)
{
// Now we generate token spans until
// 1) we have parsed at least the full textChange.NewLength amount, and
// 2) we finish whatever statement we are currently on
foreach (var tokenSpan in tokenBuilder.GetTokenSpans(span.Start, Math.Max(textChange.NewLength + span.Start, span.End)))
{
ProcessTokenSpan(tokenSpan, tokenBuilder, statementBuilder);
}
}
}
_tagSpans.Update(textSnapshot, _statements.TagSpans);
}
