Update all position tracking calls in lex_parser.c to use the scc_pos_* function family (scc_pos_next, scc_pos_next_line) instead of the deprecated core_pos_* variants. This ensures consistency with the scc naming convention and prepares for future removal of the old core functions.
词法分析
参考LCC的此分析部分
主要使用 LL(n) 硬编码查找token