Function rotate

other_src/lua/src/lpeg.cpp:852–856

** rotate array slice p[0]-p[e] (both inclusive) 'n' steps ** to the 'left' */

** to the 'left'
*/
static void rotate (Instruction *p, int e, int n) {
  invert(p, n - 1);
  invert(p + n, e - n);
  invert(p, e);
}


#define op_step(p)	((p)->i.code == IAny ? (p)->i.aux : 1)