public static int GetTrailingTriviaTokenEndIndex(IToken token, BufferedTokenStream tokenStream, int triviaChannel = -1)
{
IList<IToken> tokens = tokenStream.GetTokens();
int i = token.TokenIndex + 1;
int lastTriviaToken = token.TokenIndex;
while (i < tokens.Count)
{
IToken t = tokens[i];
string text = t.Text;
if (t.Channel == 0)
{
return lastTriviaToken;
}
else if (text.Contains('\r') || text.Contains('\n'))
{
if (string.IsNullOrWhiteSpace(text)) return lastTriviaToken;
else return i;
}
else if (triviaChannel < 0 || t.Channel == triviaChannel)
{
lastTriviaToken = i;
}
++i;
}
return lastTriviaToken;
}
public static int GetLeadingTriviaTokenStartIndex(IToken token, BufferedTokenStream tokenStream, int triviaChannel = -1)
{
IList<IToken> tokens = tokenStream.GetTokens();
int lastNewLine = -1;
int i = token.TokenIndex - 1;
int lastTriviaToken = token.TokenIndex;
int lastTriviaTokenBeforeNewLine = lastTriviaToken;
while (i >= 0)
{
IToken t = tokens[i];
string text = t.Text;
if (t.Channel == 0)
{
if (lastNewLine < 0) return lastTriviaToken;
else return lastTriviaTokenBeforeNewLine;
}
else if (string.IsNullOrWhiteSpace(text) && (text.Contains('\r') || text.Contains('\n')))
{
lastTriviaTokenBeforeNewLine = lastTriviaToken;
lastNewLine = i;
}
else if (triviaChannel < 0 || t.Channel == triviaChannel)
{
lastTriviaToken = i;
}
--i;
}
return lastTriviaToken;
}
public static IList<IToken> GetTrailingTriviaTokens(IToken token, BufferedTokenStream tokenStream, int triviaChannel = -1)
{
int startIndex = token.TokenIndex + 1;
int endIndex = GetTrailingTriviaTokenEndIndex(token, tokenStream, triviaChannel);
if (startIndex >= 0 && startIndex <= endIndex && endIndex <= tokenStream.Size)
{
return tokenStream.GetTokens(startIndex, endIndex);
}
return new List<IToken>();
}