58   const char *Pos = CurrentLine.end();  in advance()  local
59   assert(Pos == Buffer->getBufferStart() || isAtLineEnd(Pos) || *Pos == '\0');  in advance()
61   if (skipIfAtLineEnd(Pos))  in advance()
63   if (!SkipBlanks && isAtLineEnd(Pos)) {  in advance()
67     while (skipIfAtLineEnd(Pos))  in advance()
72       if (isAtLineEnd(Pos) && !SkipBlanks)  in advance()
74       if (*Pos == CommentMarker)  in advance()
76           ++Pos;  in advance()
77         } while (*Pos != '\0' && !isAtLineEnd(Pos));  in advance()
78       if (!skipIfAtLineEnd(Pos))  in advance()
84   if (*Pos == '\0') {  in advance()
93   while (Pos[Length] != '\0' && !isAtLineEnd(&Pos[Length])) {  in advance()
97   CurrentLine = StringRef(Pos, Length);  in advance()