![Paul Sokolovsky](/assets/img/avatar_default.png)
Now that specialized utimeq module has been implenented, revert previous
adhoc changes to uheapq.
This reverts commit 0cbc07227c
.
123 lines
4.5 KiB
C
123 lines
4.5 KiB
C
/*
|
|
* This file is part of the Micro Python project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 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 "py/nlr.h"
|
|
#include "py/objlist.h"
|
|
#include "py/runtime0.h"
|
|
#include "py/runtime.h"
|
|
|
|
#if MICROPY_PY_UHEAPQ
|
|
|
|
// the algorithm here is modelled on CPython's heapq.py
|
|
|
|
STATIC mp_obj_list_t *get_heap(mp_obj_t heap_in) {
|
|
if (!MP_OBJ_IS_TYPE(heap_in, &mp_type_list)) {
|
|
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "heap must be a list"));
|
|
}
|
|
return MP_OBJ_TO_PTR(heap_in);
|
|
}
|
|
|
|
STATIC void heap_siftdown(mp_obj_list_t *heap, mp_uint_t start_pos, mp_uint_t pos) {
|
|
mp_obj_t item = heap->items[pos];
|
|
while (pos > start_pos) {
|
|
mp_uint_t parent_pos = (pos - 1) >> 1;
|
|
mp_obj_t parent = heap->items[parent_pos];
|
|
if (mp_binary_op(MP_BINARY_OP_LESS, item, parent) == mp_const_true) {
|
|
heap->items[pos] = parent;
|
|
pos = parent_pos;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
heap->items[pos] = item;
|
|
}
|
|
|
|
STATIC void heap_siftup(mp_obj_list_t *heap, mp_uint_t pos) {
|
|
mp_uint_t start_pos = pos;
|
|
mp_uint_t end_pos = heap->len;
|
|
mp_obj_t item = heap->items[pos];
|
|
for (mp_uint_t child_pos = 2 * pos + 1; child_pos < end_pos; child_pos = 2 * pos + 1) {
|
|
// choose right child if it's <= left child
|
|
if (child_pos + 1 < end_pos && mp_binary_op(MP_BINARY_OP_LESS, heap->items[child_pos], heap->items[child_pos + 1]) == mp_const_false) {
|
|
child_pos += 1;
|
|
}
|
|
// bubble up the smaller child
|
|
heap->items[pos] = heap->items[child_pos];
|
|
pos = child_pos;
|
|
}
|
|
heap->items[pos] = item;
|
|
heap_siftdown(heap, start_pos, pos);
|
|
}
|
|
|
|
STATIC mp_obj_t mod_uheapq_heappush(mp_obj_t heap_in, mp_obj_t item) {
|
|
mp_obj_list_t *heap = get_heap(heap_in);
|
|
mp_obj_list_append(heap_in, item);
|
|
heap_siftdown(heap, 0, heap->len - 1);
|
|
return mp_const_none;
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_uheapq_heappush_obj, mod_uheapq_heappush);
|
|
|
|
STATIC mp_obj_t mod_uheapq_heappop(mp_obj_t heap_in) {
|
|
mp_obj_list_t *heap = get_heap(heap_in);
|
|
if (heap->len == 0) {
|
|
nlr_raise(mp_obj_new_exception_msg(&mp_type_IndexError, "empty heap"));
|
|
}
|
|
mp_obj_t item = heap->items[0];
|
|
heap->len -= 1;
|
|
heap->items[0] = heap->items[heap->len];
|
|
heap->items[heap->len] = MP_OBJ_NULL; // so we don't retain a pointer
|
|
if (heap->len) {
|
|
heap_siftup(heap, 0);
|
|
}
|
|
return item;
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_uheapq_heappop_obj, mod_uheapq_heappop);
|
|
|
|
STATIC mp_obj_t mod_uheapq_heapify(mp_obj_t heap_in) {
|
|
mp_obj_list_t *heap = get_heap(heap_in);
|
|
for (mp_uint_t i = heap->len / 2; i > 0;) {
|
|
heap_siftup(heap, --i);
|
|
}
|
|
return mp_const_none;
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_uheapq_heapify_obj, mod_uheapq_heapify);
|
|
|
|
STATIC const mp_rom_map_elem_t mp_module_uheapq_globals_table[] = {
|
|
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_uheapq) },
|
|
{ MP_ROM_QSTR(MP_QSTR_heappush), MP_ROM_PTR(&mod_uheapq_heappush_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_heappop), MP_ROM_PTR(&mod_uheapq_heappop_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_heapify), MP_ROM_PTR(&mod_uheapq_heapify_obj) },
|
|
};
|
|
|
|
STATIC MP_DEFINE_CONST_DICT(mp_module_uheapq_globals, mp_module_uheapq_globals_table);
|
|
|
|
const mp_obj_module_t mp_module_uheapq = {
|
|
.base = { &mp_type_module },
|
|
.globals = (mp_obj_dict_t*)&mp_module_uheapq_globals,
|
|
};
|
|
|
|
#endif //MICROPY_PY_UHEAPQ
|