static int SearchMatchingBracketBackward(IReadonlyTextDocument document, int offset, char openBracket, char closingBracket, CancellationToken cancellationToken)
{
bool isInBlockComment = false;
bool isInLineComment = false;
int curStringQuote = -1;
var lang = TextMateLanguage.Create(SyntaxHighlightingService.GetScopeForFileName(document.FileName));
var lineComments = lang.LineComments;
var blockCommentStarts = lang.BlockComments.Select(b => b.Item1).ToList();
var blockCommentEnds = lang.BlockComments.Select(b => b.Item2).ToList();
var stringQuotes = new string [] { "\"", "'" };
bool startsInLineComment = StartsInLineComment(document, offset);
int depth = -1;
if (!startsInLineComment)
{
offset = GetLastSourceCodePosition(document, offset);
}
while (offset >= 0 && offset < document.Length)
{
if (offset % 100 == 0 && cancellationToken.IsCancellationRequested)
{
return(-1);
}
char ch = document.GetCharAt(offset);
// check block comments
if (!isInLineComment && curStringQuote < 0)
{
if (!isInBlockComment)
{
isInBlockComment = StartsWithListMember(document, blockCommentEnds, offset) >= 0;
}
else
{
isInBlockComment = StartsWithListMember(document, blockCommentStarts, offset) < 0;
}
}
if (!isInBlockComment && !isInLineComment)
{
int i = StartsWithListMember(document, stringQuotes, offset);
if (i >= 0)
{
if (curStringQuote >= 0)
{
if (curStringQuote == i)
{
curStringQuote = -1;
}
}
else
{
curStringQuote = i;
}
}
}
switch (ch)
{
case '\n':
case '\r':
if (startsInLineComment)
{
return(-1);
}
offset--;
while (offset > 0 && (document.GetCharAt(offset) == '\n' || document.GetCharAt(offset) == '\r'))
{
offset--;
}
offset = GetLastSourceCodePosition(document, offset) + 1;
break;
default:
if (ch == closingBracket)
{
if (!(curStringQuote >= 0 || isInBlockComment))
{
--depth;
}
}
else if (ch == openBracket)
{
if (!(curStringQuote >= 0 || isInBlockComment))
{
++depth;
if (depth == 0)
{
return(offset);
}
}
}
break;
}
offset--;
}
return(-1);
}