text: /*
   * This file is part of the MicroPython project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2013, 2014 Damien P. George
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  #include <stdlib.h>
  #include <assert.h>
  
  #include "py/nlr.h"
  #include "py/obj.h"
  #include "py/runtime0.h"
  
  /******************************************************************************/
  /* slice object                                                               */
  
  #if MICROPY_PY_BUILTINS_SLICE
  
  // TODO: This implements only variant of slice with 2 integer args only.
  // CPython supports 3rd arg (step), plus args can be arbitrary Python objects.
  typedef struct _mp_obj_slice_t {
      mp_obj_base_t base;
      mp_obj_t start;
      mp_obj_t stop;
      mp_obj_t step;
  } mp_obj_slice_t;
  
  STATIC void slice_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
      (void)kind;
      mp_obj_slice_t *o = MP_OBJ_TO_PTR(o_in);
      mp_print_str(print, "slice(");
      mp_obj_print_helper(print, o->start, PRINT_REPR);
      mp_print_str(print, ", ");
      mp_obj_print_helper(print, o->stop, PRINT_REPR);
      mp_print_str(print, ", ");
      mp_obj_print_helper(print, o->step, PRINT_REPR);
      mp_print_str(print, ")");
  }
  
  #if MICROPY_PY_BUILTINS_SLICE_ATTRS
  STATIC void slice_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
      if (dest[0] != MP_OBJ_NULL) {
          // not load attribute
          return;
      }
      mp_obj_slice_t *self = MP_OBJ_TO_PTR(self_in);
      if (attr == MP_QSTR_start) {
          dest[0] = self->start;
      } else if (attr == MP_QSTR_stop) {
          dest[0] = self->stop;
      } else if (attr == MP_QSTR_step) {
          dest[0] = self->step;
      }
  }
  #endif
  
  const mp_obj_type_t mp_type_slice = {
      { &mp_type_type },
      .name = MP_QSTR_slice,
      .print = slice_print,
  #if MICROPY_PY_BUILTINS_SLICE_ATTRS
      .attr = slice_attr,
  #endif
  };
  
  mp_obj_t mp_obj_new_slice(mp_obj_t ostart, mp_obj_t ostop, mp_obj_t ostep) {
      mp_obj_slice_t *o = m_new_obj(mp_obj_slice_t);
      o->base.type = &mp_type_slice;
      o->start = ostart;
      o->stop = ostop;
      o->step = ostep;
      return MP_OBJ_FROM_PTR(o);
  }
  
  void mp_obj_slice_get(mp_obj_t self_in, mp_obj_t *start, mp_obj_t *stop, mp_obj_t *step) {
      assert(MP_OBJ_IS_TYPE(self_in, &mp_type_slice));
      mp_obj_slice_t *self = MP_OBJ_TO_PTR(self_in);
      *start = self->start;
      *stop = self->stop;
      *step = self->step;
  }
  
  #endif
  