/// <summary>
/// parses buffer
/// </summary>
/// <param name="parser"></param>
/// <param name="parent">parent region or null</param>
/// <returns>a region with its children or null</returns>
protected virtual TextRegion ParseBuffer(SnapshotParser parser, TextRegion parent)
{
for (; !parser.AtEnd(); parser.MoveNext()) {
ProcessCurrentToken(parser);
TextRegion r = TryCreateRegion(parser);
if (r != null) {
//found the start of the region
OnRegionFound(r);
r.Parent = parent;
parser.MoveNext();
if (!r.Complete) {
//searching for child regions
while (ParseBuffer(parser, r) != null) ;
}
//adding to children or merging with last child
if (!TryMergeComments(parent, r)) {
parent.Children.Add(r);
ExtendStartPoint(r);
}
return r;
}
//found parent's end - terminating parsing
if (TryComplete(parent, parser)) {
parser.MoveNext();
return null;
}
}
return null;
}
/// <summary>
/// parser the text buffer
/// </summary>
/// <param name="parser">buffer parser</param>
/// <returns>text region tree</returns>
public TextRegion ParseBuffer(SnapshotParser parser)
{
FunctionOccured = false;
TextRegion regionTree = new TextRegion();
while (ParseBuffer(parser, regionTree) != null);
return regionTree;
}
/// <summary>
/// parser the text buffer
/// </summary>
/// <param name="parser">buffer parser</param>
/// <returns>text region tree</returns>
public TextRegion ParseBuffer(SnapshotParser parser)
{
FunctionOccured = false;
TextRegion regionTree = new TextRegion();
while (ParseBuffer(parser, regionTree) != null)
{
;
}
return(regionTree);
}
/// <summary>
/// Gets nested outlining regions for buffer
/// </summary>
protected void Outline()
{
ITextSnapshot snapshot = Buffer.CurrentSnapshot;
SnapshotParser parser = GetSnapshotParser(snapshot);
//parsing snapshot
TextRegion regionTree = Outliner.ParseBuffer(parser);
List <TextRegion> newRegions = GetRegionList(regionTree);
List <Span> oldSpans = Regions.ConvertAll(r => r.AsSnapshotSpan().TranslateTo(snapshot, SpanTrackingMode.EdgeExclusive).Span);
List <Span> newSpans = newRegions.ConvertAll(r => r.AsSnapshotSpan().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 = snapshot;
this.Regions = newRegions;
if (changeStart <= changeEnd && this.TagsChanged != null)
{
this.TagsChanged(this, new SnapshotSpanEventArgs(
new SnapshotSpan(this.Snapshot, Span.FromBounds(changeStart, changeEnd))));
}
FirstOutlining = false;
}
/// <summary>
/// parses buffer
/// </summary>
/// <param name="parser"></param>
/// <param name="parent">parent region or null</param>
/// <returns>a region with its children or null</returns>
protected virtual TextRegion ParseBuffer(SnapshotParser parser, TextRegion parent)
{
for (; !parser.AtEnd(); parser.MoveNext())
{
ProcessCurrentToken(parser);
TextRegion r = TryCreateRegion(parser);
if (r != null)
{
//found the start of the region
OnRegionFound(r);
r.Parent = parent;
parser.MoveNext();
if (!r.Complete)
{
//searching for child regions
while (ParseBuffer(parser, r) != null)
{
;
}
}
//adding to children or merging with last child
if (!TryMergeComments(parent, r))
{
parent.Children.Add(r);
ExtendStartPoint(r);
}
return(r);
}
//found parent's end - terminating parsing
if (TryComplete(parent, parser))
{
parser.MoveNext();
return(null);
}
}
return(null);
}
/// <summary>
/// A function that looks for special tokens in source code
/// </summary>
protected virtual void ProcessCurrentToken(SnapshotParser p)
{
}
/// <summary> /// tries to close region /// </summary> /// <param name="parser">parser</param> /// <returns>whether region was closed</returns> protected abstract bool TryComplete(TextRegion r, SnapshotParser parser);
/// <summary> /// parses input buffer, searches for region start /// </summary> /// <param name="parser"></param> /// <returns>created region or null</returns> public abstract TextRegion TryCreateRegion(SnapshotParser parser);
/// <summary> /// tries to close region /// </summary> /// <param name="parser">parser</param> /// <returns>whether region was closed</returns> protected abstract bool TryComplete(TextRegion r, SnapshotParser parser);
/// <summary>
/// A function that looks for special tokens in source code
/// </summary>
protected virtual void ProcessCurrentToken(SnapshotParser p)
{
}
/// <summary> /// parses input buffer, searches for region start /// </summary> /// <param name="parser"></param> /// <returns>created region or null</returns> public abstract TextRegion TryCreateRegion(SnapshotParser parser);