54   const char *Pos = CurrentLine.end();  in advance()  local
55   assert(Pos == Buffer->getBufferStart() || isAtLineEnd(Pos) || *Pos == '\0');  in advance()
57   if (skipIfAtLineEnd(Pos))  in advance()
59   if (!SkipBlanks && isAtLineEnd(Pos)) {  in advance()
63     while (skipIfAtLineEnd(Pos))  in advance()
68       if (isAtLineEnd(Pos) && !SkipBlanks)  in advance()
70       if (*Pos == CommentMarker)  in advance()
72           ++Pos;  in advance()
73         } while (*Pos != '\0' && !isAtLineEnd(Pos));  in advance()
74       if (!skipIfAtLineEnd(Pos))  in advance()
80   if (*Pos == '\0') {  in advance()
89   while (Pos[Length] != '\0' && !isAtLineEnd(&Pos[Length])) {  in advance()
93   CurrentLine = StringRef(Pos, Length);  in advance()