parse_mode
ret = parse_mode(it.handle, mode, &score, width_mm, height_mm, notch_height);
static enum eqn_tok eqn_next(struct eqn_node *, enum parse_mode);
eqn_next(struct eqn_node *ep, enum parse_mode mode)
void parse_mode(char **, int *);
parse_mode(&p, &mode);
parse_mode(&pos, &mode);