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/*
* 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 "py/nlr.h"
#include "py/runtime0.h"
#include "py/runtime.h"
/******************************************************************************/
/* range iterator */
typedef struct _mp_obj_range_it_t {
mp_obj_base_t base;
// TODO make these values generic objects or something
mp_int_t cur;
mp_int_t stop;
mp_int_t step;
} mp_obj_range_it_t;
STATIC mp_obj_t range_it_iternext(mp_obj_t o_in) {
mp_obj_range_it_t *o = MP_OBJ_TO_PTR(o_in);
if ((o->step > 0 && o->cur < o->stop) || (o->step < 0 && o->cur > o->stop)) {
mp_obj_t o_out = MP_OBJ_NEW_SMALL_INT(o->cur);
o->cur += o->step;
return o_out;
} else {
return MP_OBJ_STOP_ITERATION;
}
}
STATIC const mp_obj_type_t range_it_type = {
{ &mp_type_type },
.name = MP_QSTR_iterator,
.getiter = mp_identity_getiter,
.iternext = range_it_iternext,
};
STATIC mp_obj_t mp_obj_new_range_iterator(mp_int_t cur, mp_int_t stop, mp_int_t step, mp_obj_iter_buf_t *iter_buf) {
assert(sizeof(mp_obj_range_it_t) <= sizeof(mp_obj_iter_buf_t));
mp_obj_range_it_t *o = (mp_obj_range_it_t*)iter_buf;
o->base.type = &range_it_type;
o->cur = cur;
o->stop = stop;
o->step = step;
return MP_OBJ_FROM_PTR(o);
}
/******************************************************************************/
/* range */
typedef struct _mp_obj_range_t {
mp_obj_base_t base;
// TODO make these values generic objects or something
mp_int_t start;
mp_int_t stop;
mp_int_t step;
} mp_obj_range_t;
STATIC void range_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
(void)kind;
mp_obj_range_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, "range(" INT_FMT ", " INT_FMT "", self->start, self->stop);
if (self->step == 1) {
mp_print_str(print, ")");
} else {
mp_printf(print, ", " INT_FMT ")", self->step);
}
}
STATIC mp_obj_t range_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 1, 3, false);
mp_obj_range_t *o = m_new_obj(mp_obj_range_t);
o->base.type = type;
o->start = 0;
o->step = 1;
if (n_args == 1) {
o->stop = mp_obj_get_int(args[0]);
} else {
o->start = mp_obj_get_int(args[0]);
o->stop = mp_obj_get_int(args[1]);
if (n_args == 3) {
o->step = mp_obj_get_int(args[2]);
if (o->step == 0) {
mp_raise_ValueError("zero step");
}
}
}
return MP_OBJ_FROM_PTR(o);
}
STATIC mp_int_t range_len(mp_obj_range_t *self) {
// When computing length, need to take into account step!=1 and step<0.
mp_int_t len = self->stop - self->start + self->step;
if (self->step > 0) {
len -= 1;
} else {
len += 1;
}
len = len / self->step;
if (len < 0) {
len = 0;
}
return len;
}
STATIC mp_obj_t range_unary_op(mp_uint_t op, mp_obj_t self_in) {
mp_obj_range_t *self = MP_OBJ_TO_PTR(self_in);
mp_int_t len = range_len(self);
switch (op) {
case MP_UNARY_OP_BOOL: return mp_obj_new_bool(len > 0);
case MP_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(len);
default: return MP_OBJ_NULL; // op not supported
}
}
STATIC mp_obj_t range_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
if (value == MP_OBJ_SENTINEL) {
// load
mp_obj_range_t *self = MP_OBJ_TO_PTR(self_in);
mp_int_t len = range_len(self);
#if MICROPY_PY_BUILTINS_SLICE
if (MP_OBJ_IS_TYPE(index, &mp_type_slice)) {
mp_bound_slice_t slice;
mp_seq_get_fast_slice_indexes(len, index, &slice);
mp_obj_range_t *o = m_new_obj(mp_obj_range_t);
o->base.type = &mp_type_range;
o->start = self->start + slice.start * self->step;
o->stop = self->start + slice.stop * self->step;
o->step = slice.step * self->step;
if (slice.step < 0) {
// Negative slice steps have inclusive stop, so adjust for exclusive
o->stop -= self->step;
}
return MP_OBJ_FROM_PTR(o);
}
#endif
size_t index_val = mp_get_index(self->base.type, len, index, false);
return MP_OBJ_NEW_SMALL_INT(self->start + index_val * self->step);
} else {
return MP_OBJ_NULL; // op not supported
}
}
STATIC mp_obj_t range_getiter(mp_obj_t o_in, mp_obj_iter_buf_t *iter_buf) {
mp_obj_range_t *o = MP_OBJ_TO_PTR(o_in);
return mp_obj_new_range_iterator(o->start, o->stop, o->step, iter_buf);
}
#if MICROPY_PY_BUILTINS_RANGE_ATTRS
STATIC void range_attr(mp_obj_t o_in, qstr attr, mp_obj_t *dest) {
if (dest[0] != MP_OBJ_NULL) {
// not load attribute
return;
}
mp_obj_range_t *o = MP_OBJ_TO_PTR(o_in);
if (attr == MP_QSTR_start) {
dest[0] = mp_obj_new_int(o->start);
} else if (attr == MP_QSTR_stop) {
dest[0] = mp_obj_new_int(o->stop);
} else if (attr == MP_QSTR_step) {
dest[0] = mp_obj_new_int(o->step);
}
}
#endif
const mp_obj_type_t mp_type_range = {
{ &mp_type_type },
.name = MP_QSTR_range,
.print = range_print,
.make_new = range_make_new,
.unary_op = range_unary_op,
.subscr = range_subscr,
.getiter = range_getiter,
#if MICROPY_PY_BUILTINS_RANGE_ATTRS
.attr = range_attr,
#endif
};
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