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micropython/py/objlist.c
Paul Sokolovsky cefcbb22b2 objarray: Implement array slice assignment. 
This is rarely used feature which takes enough code to implement, so is
controlled by MICROPY_PY_ARRAY_SLICE_ASSIGN config setting, default off.
But otherwise it may be useful, as allows to update arbitrary-sized data
buffers in-place.

Slice is yet to implement, and actually, slice assignment implemented in
such a way that RHS of assignment should be array of the exact same item
typecode as LHS. CPython has it more relaxed, where RHS can be any sequence
of compatible types (e.g. it's possible to assign list of int's to a
bytearray slice).

Overall, when all "slice write" features are implemented, it may cost ~1KB
of code.
2015-02-27 22:17:15 +02:00

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/*
* This file is part of the Micro Python 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 <string.h>
#include <assert.h>
#include "py/nlr.h"
#include "py/objlist.h"
#include "py/runtime0.h"
#include "py/runtime.h"
#include "py/stackctrl.h"
STATIC mp_obj_t mp_obj_new_list_iterator(mp_obj_list_t *list, mp_uint_t cur);
STATIC mp_obj_list_t *list_new(mp_uint_t n);
STATIC mp_obj_t list_extend(mp_obj_t self_in, mp_obj_t arg_in);
STATIC mp_obj_t list_pop(mp_uint_t n_args, const mp_obj_t *args);
// TODO: Move to mpconfig.h
#define LIST_MIN_ALLOC 4
/******************************************************************************/
/* list */
STATIC void list_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in, mp_print_kind_t kind) {
mp_obj_list_t *o = o_in;
if (!(MICROPY_PY_UJSON && kind == PRINT_JSON)) {
kind = PRINT_REPR;
}
print(env, "[");
for (mp_uint_t i = 0; i < o->len; i++) {
if (i > 0) {
print(env, ", ");
}
mp_obj_print_helper(print, env, o->items[i], kind);
}
print(env, "]");
}
STATIC mp_obj_t list_extend_from_iter(mp_obj_t list, mp_obj_t iterable) {
mp_obj_t iter = mp_getiter(iterable);
mp_obj_t item;
while ((item = mp_iternext(iter)) != MP_OBJ_STOP_ITERATION) {
mp_obj_list_append(list, item);
}
return list;
}
STATIC mp_obj_t list_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
(void)type_in;
mp_arg_check_num(n_args, n_kw, 0, 1, false);
switch (n_args) {
case 0:
// return a new, empty list
return mp_obj_new_list(0, NULL);
case 1:
default: {
// make list from iterable
// TODO: optimize list/tuple
mp_obj_t list = mp_obj_new_list(0, NULL);
return list_extend_from_iter(list, args[0]);
}
}
}
// Don't pass MP_BINARY_OP_NOT_EQUAL here
STATIC bool list_cmp_helper(mp_uint_t op, mp_obj_t self_in, mp_obj_t another_in) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_list));
if (!MP_OBJ_IS_TYPE(another_in, &mp_type_list)) {
return false;
}
mp_obj_list_t *self = self_in;
mp_obj_list_t *another = another_in;
return mp_seq_cmp_objs(op, self->items, self->len, another->items, another->len);
}
STATIC mp_obj_t list_unary_op(mp_uint_t op, mp_obj_t self_in) {
mp_obj_list_t *self = self_in;
switch (op) {
case MP_UNARY_OP_BOOL: return MP_BOOL(self->len != 0);
case MP_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(self->len);
default: return MP_OBJ_NULL; // op not supported
}
}
STATIC mp_obj_t list_binary_op(mp_uint_t op, mp_obj_t lhs, mp_obj_t rhs) {
mp_obj_list_t *o = lhs;
switch (op) {
case MP_BINARY_OP_ADD: {
if (!MP_OBJ_IS_TYPE(rhs, &mp_type_list)) {
return MP_OBJ_NULL; // op not supported
}
mp_obj_list_t *p = rhs;
mp_obj_list_t *s = list_new(o->len + p->len);
mp_seq_cat(s->items, o->items, o->len, p->items, p->len, mp_obj_t);
return s;
}
case MP_BINARY_OP_INPLACE_ADD: {
if (!MP_OBJ_IS_TYPE(rhs, &mp_type_list)) {
return MP_OBJ_NULL; // op not supported
}
list_extend(lhs, rhs);
return o;
}
case MP_BINARY_OP_MULTIPLY: {
mp_int_t n;
if (!mp_obj_get_int_maybe(rhs, &n)) {
return MP_OBJ_NULL; // op not supported
}
if (n < 0) {
n = 0;
}
mp_obj_list_t *s = list_new(o->len * n);
mp_seq_multiply(o->items, sizeof(*o->items), o->len, n, s->items);
return s;
}
case MP_BINARY_OP_EQUAL:
case MP_BINARY_OP_LESS:
case MP_BINARY_OP_LESS_EQUAL:
case MP_BINARY_OP_MORE:
case MP_BINARY_OP_MORE_EQUAL:
return MP_BOOL(list_cmp_helper(op, lhs, rhs));
default:
return MP_OBJ_NULL; // op not supported
}
}
STATIC mp_obj_t list_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
if (value == MP_OBJ_NULL) {
// delete
#if MICROPY_PY_BUILTINS_SLICE
if (MP_OBJ_IS_TYPE(index, &mp_type_slice)) {
mp_obj_list_t *self = self_in;
mp_bound_slice_t slice;
if (!mp_seq_get_fast_slice_indexes(self->len, index, &slice)) {
assert(0);
}
mp_int_t len_adj = slice.start - slice.stop;
//printf("Len adj: %d\n", len_adj);
assert(len_adj <= 0);
mp_seq_replace_slice_no_grow(self->items, self->len, slice.start, slice.stop, self->items/*NULL*/, 0, sizeof(*self->items));
// Clear "freed" elements at the end of list
mp_seq_clear(self->items, self->len + len_adj, self->len, sizeof(*self->items));
self->len += len_adj;
return mp_const_none;
}
#endif
mp_obj_t args[2] = {self_in, index};
list_pop(2, args);
return mp_const_none;
} else if (value == MP_OBJ_SENTINEL) {
// load
mp_obj_list_t *self = self_in;
#if MICROPY_PY_BUILTINS_SLICE
if (MP_OBJ_IS_TYPE(index, &mp_type_slice)) {
mp_bound_slice_t slice;
if (!mp_seq_get_fast_slice_indexes(self->len, index, &slice)) {
return mp_seq_extract_slice(self->len, self->items, &slice);
}
mp_obj_list_t *res = list_new(slice.stop - slice.start);
mp_seq_copy(res->items, self->items + slice.start, res->len, mp_obj_t);
return res;
}
#endif
mp_uint_t index_val = mp_get_index(self->base.type, self->len, index, false);
return self->items[index_val];
} else {
#if MICROPY_PY_BUILTINS_SLICE
if (MP_OBJ_IS_TYPE(index, &mp_type_slice)) {
mp_obj_list_t *self = self_in;
assert(MP_OBJ_IS_TYPE(value, &mp_type_list));
mp_obj_list_t *slice = value;
mp_bound_slice_t slice_out;
if (!mp_seq_get_fast_slice_indexes(self->len, index, &slice_out)) {
assert(0);
}
mp_int_t len_adj = slice->len - (slice_out.stop - slice_out.start);
//printf("Len adj: %d\n", len_adj);
if (len_adj > 0) {
if (self->len + len_adj > self->alloc) {
// TODO: Might optimize memory copies here by checking if block can
// be grown inplace or not
self->items = m_renew(mp_obj_t, self->items, self->alloc, self->len + len_adj);
self->alloc = self->len + len_adj;
}
mp_seq_replace_slice_grow_inplace(self->items, self->len,
slice_out.start, slice_out.stop, slice->items, slice->len, len_adj, sizeof(*self->items));
} else {
mp_seq_replace_slice_no_grow(self->items, self->len,
slice_out.start, slice_out.stop, slice->items, slice->len, sizeof(*self->items));
// Clear "freed" elements at the end of list
mp_seq_clear(self->items, self->len + len_adj, self->len, sizeof(*self->items));
// TODO: apply allocation policy re: alloc_size
}
self->len += len_adj;
return mp_const_none;
}
#endif
mp_obj_list_store(self_in, index, value);
return mp_const_none;
}
}
STATIC mp_obj_t list_getiter(mp_obj_t o_in) {
return mp_obj_new_list_iterator(o_in, 0);
}
mp_obj_t mp_obj_list_append(mp_obj_t self_in, mp_obj_t arg) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_list));
mp_obj_list_t *self = self_in;
if (self->len >= self->alloc) {
self->items = m_renew(mp_obj_t, self->items, self->alloc, self->alloc * 2);
self->alloc *= 2;
mp_seq_clear(self->items, self->len + 1, self->alloc, sizeof(*self->items));
}
self->items[self->len++] = arg;
return mp_const_none; // return None, as per CPython
}
STATIC mp_obj_t list_extend(mp_obj_t self_in, mp_obj_t arg_in) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_list));
if (MP_OBJ_IS_TYPE(arg_in, &mp_type_list)) {
mp_obj_list_t *self = self_in;
mp_obj_list_t *arg = arg_in;
if (self->len + arg->len > self->alloc) {
// TODO: use alloc policy for "4"
self->items = m_renew(mp_obj_t, self->items, self->alloc, self->len + arg->len + 4);
self->alloc = self->len + arg->len + 4;
mp_seq_clear(self->items, self->len + arg->len, self->alloc, sizeof(*self->items));
}
memcpy(self->items + self->len, arg->items, sizeof(mp_obj_t) * arg->len);
self->len += arg->len;
} else {
list_extend_from_iter(self_in, arg_in);
}
return mp_const_none; // return None, as per CPython
}
STATIC mp_obj_t list_pop(mp_uint_t n_args, const mp_obj_t *args) {
assert(1 <= n_args && n_args <= 2);
assert(MP_OBJ_IS_TYPE(args[0], &mp_type_list));
mp_obj_list_t *self = args[0];
if (self->len == 0) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_IndexError, "pop from empty list"));
}
mp_uint_t index = mp_get_index(self->base.type, self->len, n_args == 1 ? MP_OBJ_NEW_SMALL_INT(-1) : args[1], false);
mp_obj_t ret = self->items[index];
self->len -= 1;
memmove(self->items + index, self->items + index + 1, (self->len - index) * sizeof(mp_obj_t));
// Clear stale pointer from slot which just got freed to prevent GC issues
self->items[self->len] = MP_OBJ_NULL;
if (self->alloc > LIST_MIN_ALLOC && self->alloc > 2 * self->len) {
self->items = m_renew(mp_obj_t, self->items, self->alloc, self->alloc/2);
self->alloc /= 2;
}
return ret;
}
STATIC void mp_quicksort(mp_obj_t *head, mp_obj_t *tail, mp_obj_t key_fn, mp_obj_t binop_less_result) {
MP_STACK_CHECK();
while (head < tail) {
mp_obj_t *h = head - 1;
mp_obj_t *t = tail;
mp_obj_t v = key_fn == MP_OBJ_NULL ? tail[0] : mp_call_function_1(key_fn, tail[0]); // get pivot using key_fn
for (;;) {
do ++h; while (h < t && mp_binary_op(MP_BINARY_OP_LESS, key_fn == MP_OBJ_NULL ? h[0] : mp_call_function_1(key_fn, h[0]), v) == binop_less_result);
do --t; while (h < t && mp_binary_op(MP_BINARY_OP_LESS, v, key_fn == MP_OBJ_NULL ? t[0] : mp_call_function_1(key_fn, t[0])) == binop_less_result);
if (h >= t) break;
mp_obj_t x = h[0];
h[0] = t[0];
t[0] = x;
}
mp_obj_t x = h[0];
h[0] = tail[0];
tail[0] = x;
// do the smaller recursive call first, to keep stack within O(log(N))
if (t - head < tail - h - 1) {
mp_quicksort(head, t, key_fn, binop_less_result);
head = h + 1;
} else {
mp_quicksort(h + 1, tail, key_fn, binop_less_result);
tail = t;
}
}
}
// TODO Python defines sort to be stable but ours is not
mp_obj_t mp_obj_list_sort(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_key, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
{ MP_QSTR_reverse, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
};
// parse args
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
mp_obj_list_t *self = pos_args[0];
assert(MP_OBJ_IS_TYPE(self, &mp_type_list));
if (self->len > 1) {
mp_quicksort(self->items, self->items + self->len - 1,
args[0].u_obj == mp_const_none ? MP_OBJ_NULL : args[0].u_obj,
args[1].u_bool ? mp_const_false : mp_const_true);
}
return mp_const_none;
}
STATIC mp_obj_t list_clear(mp_obj_t self_in) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_list));
mp_obj_list_t *self = self_in;
self->len = 0;
self->items = m_renew(mp_obj_t, self->items, self->alloc, LIST_MIN_ALLOC);
self->alloc = LIST_MIN_ALLOC;
mp_seq_clear(self->items, 0, self->alloc, sizeof(*self->items));
return mp_const_none;
}
STATIC mp_obj_t list_copy(mp_obj_t self_in) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_list));
mp_obj_list_t *self = self_in;
return mp_obj_new_list(self->len, self->items);
}
STATIC mp_obj_t list_count(mp_obj_t self_in, mp_obj_t value) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_list));
mp_obj_list_t *self = self_in;
return mp_seq_count_obj(self->items, self->len, value);
}
STATIC mp_obj_t list_index(mp_uint_t n_args, const mp_obj_t *args) {
assert(2 <= n_args && n_args <= 4);
assert(MP_OBJ_IS_TYPE(args[0], &mp_type_list));
mp_obj_list_t *self = args[0];
return mp_seq_index_obj(self->items, self->len, n_args, args);
}
STATIC mp_obj_t list_insert(mp_obj_t self_in, mp_obj_t idx, mp_obj_t obj) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_list));
mp_obj_list_t *self = self_in;
// insert has its own strange index logic
mp_int_t index = MP_OBJ_SMALL_INT_VALUE(idx);
if (index < 0) {
index += self->len;
}
if (index < 0) {
index = 0;
}
if ((mp_uint_t)index > self->len) {
index = self->len;
}
mp_obj_list_append(self_in, mp_const_none);
for (mp_int_t i = self->len-1; i > index; i--) {
self->items[i] = self->items[i-1];
}
self->items[index] = obj;
return mp_const_none;
}
mp_obj_t mp_obj_list_remove(mp_obj_t self_in, mp_obj_t value) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_list));
mp_obj_t args[] = {self_in, value};
args[1] = list_index(2, args);
list_pop(2, args);
return mp_const_none;
}
STATIC mp_obj_t list_reverse(mp_obj_t self_in) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_list));
mp_obj_list_t *self = self_in;
mp_int_t len = self->len;
for (mp_int_t i = 0; i < len/2; i++) {
mp_obj_t *a = self->items[i];
self->items[i] = self->items[len-i-1];
self->items[len-i-1] = a;
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(list_append_obj, mp_obj_list_append);
STATIC MP_DEFINE_CONST_FUN_OBJ_2(list_extend_obj, list_extend);
STATIC MP_DEFINE_CONST_FUN_OBJ_1(list_clear_obj, list_clear);
STATIC MP_DEFINE_CONST_FUN_OBJ_1(list_copy_obj, list_copy);
STATIC MP_DEFINE_CONST_FUN_OBJ_2(list_count_obj, list_count);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(list_index_obj, 2, 4, list_index);
STATIC MP_DEFINE_CONST_FUN_OBJ_3(list_insert_obj, list_insert);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(list_pop_obj, 1, 2, list_pop);
STATIC MP_DEFINE_CONST_FUN_OBJ_2(list_remove_obj, mp_obj_list_remove);
STATIC MP_DEFINE_CONST_FUN_OBJ_1(list_reverse_obj, list_reverse);
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(list_sort_obj, 1, mp_obj_list_sort);
STATIC const mp_map_elem_t list_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_append), (mp_obj_t)&list_append_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_clear), (mp_obj_t)&list_clear_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_copy), (mp_obj_t)&list_copy_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_count), (mp_obj_t)&list_count_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_extend), (mp_obj_t)&list_extend_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_index), (mp_obj_t)&list_index_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_insert), (mp_obj_t)&list_insert_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_pop), (mp_obj_t)&list_pop_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_remove), (mp_obj_t)&list_remove_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_reverse), (mp_obj_t)&list_reverse_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_sort), (mp_obj_t)&list_sort_obj },
};
STATIC MP_DEFINE_CONST_DICT(list_locals_dict, list_locals_dict_table);
const mp_obj_type_t mp_type_list = {
{ &mp_type_type },
.name = MP_QSTR_list,
.print = list_print,
.make_new = list_make_new,
.unary_op = list_unary_op,
.binary_op = list_binary_op,
.subscr = list_subscr,
.getiter = list_getiter,
.locals_dict = (mp_obj_t)&list_locals_dict,
};
void mp_obj_list_init(mp_obj_list_t *o, mp_uint_t n) {
o->base.type = &mp_type_list;
o->alloc = n < LIST_MIN_ALLOC ? LIST_MIN_ALLOC : n;
o->len = n;
o->items = m_new(mp_obj_t, o->alloc);
mp_seq_clear(o->items, n, o->alloc, sizeof(*o->items));
}
STATIC mp_obj_list_t *list_new(mp_uint_t n) {
mp_obj_list_t *o = m_new_obj(mp_obj_list_t);
mp_obj_list_init(o, n);
return o;
}
mp_obj_t mp_obj_new_list(mp_uint_t n, mp_obj_t *items) {
mp_obj_list_t *o = list_new(n);
if (items != NULL) {
for (mp_uint_t i = 0; i < n; i++) {
o->items[i] = items[i];
}
}
return o;
}
void mp_obj_list_get(mp_obj_t self_in, mp_uint_t *len, mp_obj_t **items) {
mp_obj_list_t *self = self_in;
*len = self->len;
*items = self->items;
}
void mp_obj_list_set_len(mp_obj_t self_in, mp_uint_t len) {
// trust that the caller knows what it's doing
// TODO realloc if len got much smaller than alloc
mp_obj_list_t *self = self_in;
self->len = len;
}
void mp_obj_list_store(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
mp_obj_list_t *self = self_in;
mp_uint_t i = mp_get_index(self->base.type, self->len, index, false);
self->items[i] = value;
}
/******************************************************************************/
/* list iterator */
typedef struct _mp_obj_list_it_t {
mp_obj_base_t base;
mp_obj_list_t *list;
mp_uint_t cur;
} mp_obj_list_it_t;
STATIC mp_obj_t list_it_iternext(mp_obj_t self_in) {
mp_obj_list_it_t *self = self_in;
if (self->cur < self->list->len) {
mp_obj_t o_out = self->list->items[self->cur];
self->cur += 1;
return o_out;
} else {
return MP_OBJ_STOP_ITERATION;
}
}
STATIC const mp_obj_type_t mp_type_list_it = {
{ &mp_type_type },
.name = MP_QSTR_iterator,
.getiter = mp_identity,
.iternext = list_it_iternext,
};
mp_obj_t mp_obj_new_list_iterator(mp_obj_list_t *list, mp_uint_t cur) {
mp_obj_list_it_t *o = m_new_obj(mp_obj_list_it_t);
o->base.type = &mp_type_list_it;
o->list = list;
o->cur = cur;
return o;
}
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