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extmod/modbtree: items(): Implement "end key inclusive" flag.

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This commit is contained in:
Paul Sokolovsky 2016-06-17 00:08:55 +03:00
parent 23067a1422
commit 332545baa3
1 changed files with 13 additions and 3 deletions
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16
extmod/modbtree.c
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@ -42,7 +42,8 @@ typedef struct _mp_obj_btree_t {
DB *db;
mp_obj_t start_key;
mp_obj_t end_key;
bool end_key_inclusive;
#define FLAG_END_KEY_INCL 1
bool flags;
} mp_obj_btree_t;
STATIC const mp_obj_type_t btree_type;
@ -62,6 +63,7 @@ STATIC mp_obj_btree_t *btree_new(DB *db) {
o->db = db;
o->start_key = MP_OBJ_NULL;
o->end_key = MP_OBJ_NULL;
o->flags = 0;
return o;
}
@ -127,7 +129,10 @@ STATIC mp_obj_t btree_range(size_t n_args, const mp_obj_t *args) {
mp_obj_btree_t *self = MP_OBJ_TO_PTR(args[0]);
self->start_key = args[1];
self->end_key = args[2];
self->end_key_inclusive = false;
self->flags = 0;
if (n_args > 3) {
self->flags = MP_OBJ_SMALL_INT_VALUE(args[3]);
}
return args[0];
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(btree_range_obj, 3, 4, btree_range);
@ -157,7 +162,11 @@ STATIC mp_obj_t btree_iternext(mp_obj_t self_in) {
DBT end_key;
end_key.data = (void*)mp_obj_str_get_data(self->end_key, &end_key.size);
BTREE *t = self->db->internal;
if (t->bt_cmp(&key, &end_key) >= 0) {
int cmp = t->bt_cmp(&key, &end_key);
if (self->flags & FLAG_END_KEY_INCL) {
cmp--;
}
if (cmp >= 0) {
self->end_key = MP_OBJ_NULL;
return MP_OBJ_STOP_ITERATION;
}
@ -244,6 +253,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_KW(mod_btree_open_obj, 1, mod_btree_open);
STATIC const mp_rom_map_elem_t mp_module_btree_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_btree) },
{ MP_ROM_QSTR(MP_QSTR_open), MP_ROM_PTR(&mod_btree_open_obj) },
{ MP_ROM_QSTR(MP_QSTR_INCL), MP_OBJ_NEW_SMALL_INT(FLAG_END_KEY_INCL) },
};
STATIC MP_DEFINE_CONST_DICT(mp_module_btree_globals, mp_module_btree_globals_table);