internal LuaClassifier(ITextBuffer buffer,
IClassificationTypeRegistryService typeService)
{
_buffer = buffer;
_grammar = new LuaGrammar();
_parser = new Irony.Parsing.Parser(_grammar);
_parser.Context.Mode = Irony.Parsing.ParseMode.VsLineScan;
_luaTags = new Dictionary <Irony.Parsing.TokenType, ClassificationTag>();
_luaTags[Irony.Parsing.TokenType.Text] = BuildTag(typeService, PredefinedClassificationTypeNames.Character);
_luaTags[Irony.Parsing.TokenType.Keyword] = BuildTag(typeService, PredefinedClassificationTypeNames.Keyword);
_luaTags[Irony.Parsing.TokenType.Identifier] = BuildTag(typeService, PredefinedClassificationTypeNames.Identifier);
_luaTags[Irony.Parsing.TokenType.String] = BuildTag(typeService, PredefinedClassificationTypeNames.String);
_luaTags[Irony.Parsing.TokenType.Literal] = BuildTag(typeService, PredefinedClassificationTypeNames.Literal);
_luaTags[Irony.Parsing.TokenType.Operator] = BuildTag(typeService, PredefinedClassificationTypeNames.Operator);
_luaTags[Irony.Parsing.TokenType.LineComment] = BuildTag(typeService, PredefinedClassificationTypeNames.Comment);
_luaTags[Irony.Parsing.TokenType.Comment] = BuildTag(typeService, PredefinedClassificationTypeNames.Comment);
_commentTag = BuildTag(typeService, PredefinedClassificationTypeNames.Comment);
_funcionTag = BuildTag(typeService, "function");
_tableTag = BuildTag(typeService, "table");
InitializeLineStates(_buffer.CurrentSnapshot);
}
void ReParse()
{
ITextSnapshot newSnapshot = buffer.CurrentSnapshot;
List <Region> newRegions = new List <Region>();
LuaLanguage.LuaGrammar grammar = new LuaLanguage.LuaGrammar();
Irony.Parsing.Parser parser = new Irony.Parsing.Parser(grammar);
var tree = parser.Parse(newSnapshot.GetText());
if (tree.Root != null)
{
FindHiddenRegions(newSnapshot, tree.Root, ref newRegions);
}
//determine the changed span, and send a changed event with the new spans
List <Span> oldSpans =
new List <Span>(this.regions.Select(r => AsSnapshotSpan(r, this.snapshot)
.TranslateTo(newSnapshot, SpanTrackingMode.EdgeExclusive)
.Span));
List <Span> newSpans =
new List <Span>(newRegions.Select(r => AsSnapshotSpan(r, newSnapshot).Span));
NormalizedSpanCollection oldSpanCollection = new NormalizedSpanCollection(oldSpans);
NormalizedSpanCollection newSpanCollection = new NormalizedSpanCollection(newSpans);
//the changed regions are regions that appear in one set or the other, but not both.
NormalizedSpanCollection removed =
NormalizedSpanCollection.Difference(oldSpanCollection, newSpanCollection);
int changeStart = int.MaxValue;
int changeEnd = -1;
if (removed.Count > 0)
{
changeStart = removed[0].Start;
changeEnd = removed[removed.Count - 1].End;
}
if (newSpans.Count > 0)
{
changeStart = Math.Min(changeStart, newSpans[0].Start);
changeEnd = Math.Max(changeEnd, newSpans[newSpans.Count - 1].End);
}
this.snapshot = newSnapshot;
this.regions = newRegions;
if (changeStart <= changeEnd)
{
ITextSnapshot snap = this.snapshot;
if (this.TagsChanged != null)
{
this.TagsChanged(this, new SnapshotSpanEventArgs(
new SnapshotSpan(this.snapshot, Span.FromBounds(changeStart, changeEnd))));
}
}
}
