235 lines
7.4 KiB
C
235 lines
7.4 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include "py/runtime.h"
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/******************************************************************************/
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/* range iterator */
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typedef struct _mp_obj_range_it_t {
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mp_obj_base_t base;
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// TODO make these values generic objects or something
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mp_int_t cur;
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mp_int_t stop;
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mp_int_t step;
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} mp_obj_range_it_t;
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STATIC mp_obj_t range_it_iternext(mp_obj_t o_in) {
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mp_obj_range_it_t *o = MP_OBJ_TO_PTR(o_in);
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if ((o->step > 0 && o->cur < o->stop) || (o->step < 0 && o->cur > o->stop)) {
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mp_obj_t o_out = MP_OBJ_NEW_SMALL_INT(o->cur);
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o->cur += o->step;
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return o_out;
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} else {
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return MP_OBJ_STOP_ITERATION;
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}
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}
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STATIC MP_DEFINE_CONST_OBJ_TYPE(
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mp_type_range_it,
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MP_QSTR_iterator,
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MP_TYPE_FLAG_ITER_IS_ITERNEXT,
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iter, range_it_iternext
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);
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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) {
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assert(sizeof(mp_obj_range_it_t) <= sizeof(mp_obj_iter_buf_t));
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mp_obj_range_it_t *o = (mp_obj_range_it_t *)iter_buf;
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o->base.type = &mp_type_range_it;
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o->cur = cur;
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o->stop = stop;
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o->step = step;
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return MP_OBJ_FROM_PTR(o);
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}
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/******************************************************************************/
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/* range */
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typedef struct _mp_obj_range_t {
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mp_obj_base_t base;
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// TODO make these values generic objects or something
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mp_int_t start;
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mp_int_t stop;
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mp_int_t step;
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} mp_obj_range_t;
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STATIC void range_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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(void)kind;
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mp_obj_range_t *self = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, "range(" INT_FMT ", " INT_FMT "", self->start, self->stop);
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if (self->step == 1) {
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mp_print_str(print, ")");
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} else {
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mp_printf(print, ", " INT_FMT ")", self->step);
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}
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}
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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) {
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mp_arg_check_num(n_args, n_kw, 1, 3, false);
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mp_obj_range_t *o = mp_obj_malloc(mp_obj_range_t, type);
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o->start = 0;
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o->step = 1;
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if (n_args == 1) {
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o->stop = mp_obj_get_int(args[0]);
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} else {
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o->start = mp_obj_get_int(args[0]);
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o->stop = mp_obj_get_int(args[1]);
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if (n_args == 3) {
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o->step = mp_obj_get_int(args[2]);
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if (o->step == 0) {
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mp_raise_ValueError(MP_ERROR_TEXT("zero step"));
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}
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}
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}
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return MP_OBJ_FROM_PTR(o);
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}
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STATIC mp_int_t range_len(mp_obj_range_t *self) {
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// When computing length, need to take into account step!=1 and step<0.
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mp_int_t len = self->stop - self->start + self->step;
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if (self->step > 0) {
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len -= 1;
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} else {
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len += 1;
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}
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len = len / self->step;
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if (len < 0) {
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len = 0;
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}
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return len;
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}
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STATIC mp_obj_t range_unary_op(mp_unary_op_t op, mp_obj_t self_in) {
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mp_obj_range_t *self = MP_OBJ_TO_PTR(self_in);
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mp_int_t len = range_len(self);
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switch (op) {
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case MP_UNARY_OP_BOOL:
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return mp_obj_new_bool(len > 0);
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case MP_UNARY_OP_LEN:
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return MP_OBJ_NEW_SMALL_INT(len);
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default:
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return MP_OBJ_NULL; // op not supported
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}
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}
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#if MICROPY_PY_BUILTINS_RANGE_BINOP
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STATIC mp_obj_t range_binary_op(mp_binary_op_t op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
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if (!mp_obj_is_type(rhs_in, &mp_type_range) || op != MP_BINARY_OP_EQUAL) {
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return MP_OBJ_NULL; // op not supported
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}
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mp_obj_range_t *lhs = MP_OBJ_TO_PTR(lhs_in);
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mp_obj_range_t *rhs = MP_OBJ_TO_PTR(rhs_in);
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mp_int_t lhs_len = range_len(lhs);
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mp_int_t rhs_len = range_len(rhs);
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return mp_obj_new_bool(
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lhs_len == rhs_len
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&& (lhs_len == 0
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|| (lhs->start == rhs->start
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&& (lhs_len == 1 || lhs->step == rhs->step)))
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);
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}
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#endif
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STATIC mp_obj_t range_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
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if (value == MP_OBJ_SENTINEL) {
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// load
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mp_obj_range_t *self = MP_OBJ_TO_PTR(self_in);
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mp_int_t len = range_len(self);
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#if MICROPY_PY_BUILTINS_SLICE
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if (mp_obj_is_type(index, &mp_type_slice)) {
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mp_bound_slice_t slice;
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mp_seq_get_fast_slice_indexes(len, index, &slice);
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mp_obj_range_t *o = mp_obj_malloc(mp_obj_range_t, &mp_type_range);
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o->start = self->start + slice.start * self->step;
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o->stop = self->start + slice.stop * self->step;
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o->step = slice.step * self->step;
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if (slice.step < 0) {
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// Negative slice steps have inclusive stop, so adjust for exclusive
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o->stop -= self->step;
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}
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return MP_OBJ_FROM_PTR(o);
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}
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#endif
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size_t index_val = mp_get_index(self->base.type, len, index, false);
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return MP_OBJ_NEW_SMALL_INT(self->start + index_val * self->step);
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} else {
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return MP_OBJ_NULL; // op not supported
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}
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}
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STATIC mp_obj_t range_getiter(mp_obj_t o_in, mp_obj_iter_buf_t *iter_buf) {
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mp_obj_range_t *o = MP_OBJ_TO_PTR(o_in);
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return mp_obj_new_range_iterator(o->start, o->stop, o->step, iter_buf);
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}
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#if MICROPY_PY_BUILTINS_RANGE_ATTRS
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STATIC void range_attr(mp_obj_t o_in, qstr attr, mp_obj_t *dest) {
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if (dest[0] != MP_OBJ_NULL) {
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// not load attribute
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return;
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}
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mp_obj_range_t *o = MP_OBJ_TO_PTR(o_in);
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if (attr == MP_QSTR_start) {
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dest[0] = mp_obj_new_int(o->start);
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} else if (attr == MP_QSTR_stop) {
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dest[0] = mp_obj_new_int(o->stop);
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} else if (attr == MP_QSTR_step) {
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dest[0] = mp_obj_new_int(o->step);
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}
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}
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#endif
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#if MICROPY_PY_BUILTINS_RANGE_BINOP
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#define RANGE_TYPE_BINOP binary_op, range_binary_op,
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#else
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#define RANGE_TYPE_BINOP
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#endif
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#if MICROPY_PY_BUILTINS_RANGE_ATTRS
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#define RANGE_TYPE_ATTR attr, range_attr,
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#else
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#define RANGE_TYPE_ATTR
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#endif
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MP_DEFINE_CONST_OBJ_TYPE(
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mp_type_range,
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MP_QSTR_range,
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MP_TYPE_FLAG_NONE,
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make_new, range_make_new,
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RANGE_TYPE_BINOP
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RANGE_TYPE_ATTR
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print, range_print,
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unary_op, range_unary_op,
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subscr, range_subscr,
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iter, range_getiter
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);
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