private unsafe PooledStructEnumerable <TeXCommentBlockSpan> GenerateTexCommentBlocks(ITextSnapshot snapshot)
{
var texCommentBlocks = blockListsPool.Get();
Debug.Assert(texCommentBlocks.Count == 0);
var contentName = snapshot.ContentType.TypeName;
if (!CommentPrefixPerContentType.TryGetValue(contentName, out var commentPrefix) ||
!TeXCommentPrefixPerContentType.TryGetValue(contentName, out var teXCommentPrefix))
{
return(new PooledStructEnumerable <TeXCommentBlockSpan>(texCommentBlocks, blockListsPool));
}
Debug.Assert(teXCommentPrefix.Length > commentPrefix.Length);
Span <char> lineStartingCharactersBuffer = stackalloc char[teXCommentPrefix.Length];
var atTexBlock = false;
var texBlockSpanBuilder = default(TeXCommentBlockSpanBuilder);
ITextSnapshotLine lastBlockLine = null;
foreach (var line in snapshot.Lines)
{
var lineStartPos = line.Start.Position;
var numberOfWhiteSpaceCharsOnStartOfLine = snapshot.NumberOfWhiteSpaceCharsOnStartOfLine(lineStartPos, line.Length);
lineStartPos += numberOfWhiteSpaceCharsOnStartOfLine;
var lineStartingCharacters = lineStartingCharactersBuffer.Slice(0, Math.Min(lineStartingCharactersBuffer.Length, line.End.Position - lineStartPos)); //line can be shorter than prefix that we are lookin for
for (int pos = 0; pos < lineStartingCharacters.Length; pos++)
{
lineStartingCharacters[pos] = snapshot[lineStartPos + pos];
}
if (atTexBlock)
{
if (lineStartingCharacters.StartsWith(teXCommentPrefix))
{
texBlockSpanBuilder.EndBlock(lastBlockLine);
texCommentBlocks.Add(texBlockSpanBuilder.Build(snapshot)); //end of current block
texBlockSpanBuilder = new TeXCommentBlockSpanBuilder(line.ExtentIncludingLineBreak, numberOfWhiteSpaceCharsOnStartOfLine, line, line.GetLineBreakText(), teXCommentPrefix, contentName); //start of new block
lastBlockLine = line;
}
else if (lineStartingCharacters.StartsWith(commentPrefix))
{
//continuation of current block
texBlockSpanBuilder.Add(line.LengthIncludingLineBreak);
lastBlockLine = line;
}
else
{
//end of current block
texBlockSpanBuilder.EndBlock(lastBlockLine);
texCommentBlocks.Add(texBlockSpanBuilder.Build(snapshot));
atTexBlock = false;
}
}
else if (lineStartingCharacters.StartsWith(teXCommentPrefix))
{
//start of new block
atTexBlock = true;
texBlockSpanBuilder = new TeXCommentBlockSpanBuilder(line.ExtentIncludingLineBreak, numberOfWhiteSpaceCharsOnStartOfLine, line, line.GetLineBreakText(), teXCommentPrefix, contentName);
lastBlockLine = line;
}
}
if (atTexBlock)
{
texBlockSpanBuilder.EndBlock(lastBlockLine);
texCommentBlocks.Add(texBlockSpanBuilder.Build(snapshot));
}
return(new PooledStructEnumerable <TeXCommentBlockSpan>(texCommentBlocks, blockListsPool));
}
