circuitpython/py/objarray.c

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#include <string.h>
#include <assert.h>
#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "runtime0.h"
#include "runtime.h"
#include "binary.h"
typedef struct _mp_obj_array_t {
mp_obj_base_t base;
machine_uint_t typecode : 8;
// free is number of unused elements after len used elements
// alloc size = len + free
machine_uint_t free : (8 * sizeof(machine_uint_t) - 8);
machine_uint_t len; // in elements
void *items;
} mp_obj_array_t;
STATIC mp_obj_t array_iterator_new(mp_obj_t array_in);
STATIC mp_obj_array_t *array_new(char typecode, uint n);
STATIC mp_obj_t array_append(mp_obj_t self_in, mp_obj_t arg);
/******************************************************************************/
/* array */
STATIC void array_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in, mp_print_kind_t kind) {
mp_obj_array_t *o = o_in;
if (o->typecode == BYTEARRAY_TYPECODE) {
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print(env, "bytearray(b", o->typecode);
mp_str_print_quoted(print, env, o->items, o->len);
} else {
print(env, "array('%c'", o->typecode);
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if (o->len > 0) {
print(env, ", [");
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for (int i = 0; i < o->len; i++) {
if (i > 0) {
print(env, ", ");
}
mp_obj_print_helper(print, env, mp_binary_get_val_array(o->typecode, o->items, i), PRINT_REPR);
}
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print(env, "]");
}
}
print(env, ")");
}
STATIC mp_obj_t array_construct(char typecode, mp_obj_t initializer) {
uint len;
// Try to create array of exact len if initializer len is known
mp_obj_t len_in = mp_obj_len_maybe(initializer);
if (len_in == MP_OBJ_NULL) {
len = 0;
} else {
len = MP_OBJ_SMALL_INT_VALUE(len_in);
}
mp_obj_array_t *array = array_new(typecode, len);
mp_obj_t iterable = mp_getiter(initializer);
mp_obj_t item;
int i = 0;
while ((item = mp_iternext(iterable)) != MP_OBJ_STOP_ITERATION) {
if (len == 0) {
array_append(array, item);
} else {
mp_binary_set_val_array(typecode, array->items, i++, item);
}
}
return array;
}
STATIC mp_obj_t array_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 1, 2, false);
// get typecode
uint l;
const char *typecode = mp_obj_str_get_data(args[0], &l);
if (n_args == 1) {
// 1 arg: make an empty array
return array_new(*typecode, 0);
} else {
// 2 args: construct the array from the given iterator
return array_construct(*typecode, args[1]);
}
}
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STATIC mp_obj_t bytearray_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 0, 1, false);
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if (n_args == 0) {
// no args: construct an empty bytearray
return array_new(BYTEARRAY_TYPECODE, 0);
} else if (MP_OBJ_IS_SMALL_INT(args[0])) {
// 1 arg, an integer: construct a blank bytearray of that length
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uint len = MP_OBJ_SMALL_INT_VALUE(args[0]);
mp_obj_array_t *o = array_new(BYTEARRAY_TYPECODE, len);
memset(o->items, 0, len);
return o;
} else {
// 1 arg, an iterator: construct the bytearray from that
return array_construct(BYTEARRAY_TYPECODE, args[0]);
}
}
STATIC mp_obj_t array_unary_op(int op, mp_obj_t o_in) {
mp_obj_array_t *o = o_in;
switch (op) {
case MP_UNARY_OP_BOOL: return MP_BOOL(o->len != 0);
case MP_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(o->len);
default: return MP_OBJ_NOT_SUPPORTED;
}
}
STATIC mp_obj_t array_append(mp_obj_t self_in, mp_obj_t arg) {
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assert(MP_OBJ_IS_TYPE(self_in, &mp_type_array) || MP_OBJ_IS_TYPE(self_in, &mp_type_bytearray));
mp_obj_array_t *self = self_in;
if (self->free == 0) {
int item_sz = mp_binary_get_size('@', self->typecode, NULL);
// TODO: alloc policy
self->free = 8;
self->items = m_realloc(self->items, item_sz * self->len, item_sz * (self->len + self->free));
mp_seq_clear(self->items, self->len + 1, self->len + self->free, item_sz);
}
mp_binary_set_val_array(self->typecode, self->items, self->len++, arg);
self->free--;
return mp_const_none; // return None, as per CPython
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(array_append_obj, array_append);
STATIC mp_obj_t array_subscr(mp_obj_t self_in, mp_obj_t index_in, mp_obj_t value) {
if (value == MP_OBJ_NULL) {
// delete item
// TODO implement
// TODO: confirmed that both bytearray and array.array support
// slice deletion
return MP_OBJ_NOT_SUPPORTED;
} else {
mp_obj_array_t *o = self_in;
if (MP_OBJ_IS_TYPE(index_in, &mp_type_slice)) {
if (value != MP_OBJ_SENTINEL) {
// Only getting a slice is suported so far, not assignment
// TODO: confirmed that both bytearray and array.array support
// slice assignment (incl. of different size)
return MP_OBJ_NOT_SUPPORTED;
}
machine_uint_t start, stop;
if (!m_seq_get_fast_slice_indexes(o->len, index_in, &start, &stop)) {
assert(0);
}
mp_obj_array_t *res = array_new(o->typecode, stop - start);
int sz = mp_binary_get_size('@', o->typecode, NULL);
assert(sz > 0);
byte *p = o->items;
memcpy(res->items, p + start * sz, (stop - start) * sz);
return res;
} else {
uint index = mp_get_index(o->base.type, o->len, index_in, false);
if (value == MP_OBJ_SENTINEL) {
// load
return mp_binary_get_val_array(o->typecode, o->items, index);
} else {
// store
mp_binary_set_val_array(o->typecode, o->items, index, value);
return mp_const_none;
}
}
}
}
STATIC machine_int_t array_get_buffer(mp_obj_t o_in, mp_buffer_info_t *bufinfo, int flags) {
mp_obj_array_t *o = o_in;
bufinfo->buf = o->items;
bufinfo->len = o->len * mp_binary_get_size('@', o->typecode, NULL);
bufinfo->typecode = o->typecode;
return 0;
}
STATIC const mp_map_elem_t array_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_append), (mp_obj_t)&array_append_obj },
};
STATIC MP_DEFINE_CONST_DICT(array_locals_dict, array_locals_dict_table);
const mp_obj_type_t mp_type_array = {
{ &mp_type_type },
.name = MP_QSTR_array,
.print = array_print,
.make_new = array_make_new,
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.getiter = array_iterator_new,
.unary_op = array_unary_op,
.subscr = array_subscr,
.buffer_p = { .get_buffer = array_get_buffer },
.locals_dict = (mp_obj_t)&array_locals_dict,
};
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const mp_obj_type_t mp_type_bytearray = {
{ &mp_type_type },
.name = MP_QSTR_bytearray,
.print = array_print,
.make_new = bytearray_make_new,
.getiter = array_iterator_new,
.unary_op = array_unary_op,
.subscr = array_subscr,
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.buffer_p = { .get_buffer = array_get_buffer },
.locals_dict = (mp_obj_t)&array_locals_dict,
};
STATIC mp_obj_array_t *array_new(char typecode, uint n) {
int typecode_size = mp_binary_get_size('@', typecode, NULL);
if (typecode_size <= 0) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "bad typecode"));
}
mp_obj_array_t *o = m_new_obj(mp_obj_array_t);
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o->base.type = (typecode == BYTEARRAY_TYPECODE) ? &mp_type_bytearray : &mp_type_array;
o->typecode = typecode;
o->free = 0;
o->len = n;
o->items = m_malloc(typecode_size * o->len);
return o;
}
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uint mp_obj_array_len(mp_obj_t self_in) {
return ((mp_obj_array_t *)self_in)->len;
}
mp_obj_t mp_obj_new_bytearray(uint n, void *items) {
mp_obj_array_t *o = array_new(BYTEARRAY_TYPECODE, n);
memcpy(o->items, items, n);
return o;
}
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// Create bytearray which references specified memory area
mp_obj_t mp_obj_new_bytearray_by_ref(uint n, void *items) {
mp_obj_array_t *o = m_new_obj(mp_obj_array_t);
o->base.type = &mp_type_array;
o->typecode = BYTEARRAY_TYPECODE;
o->free = 0;
o->len = n;
o->items = items;
return o;
}
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/******************************************************************************/
/* array iterator */
typedef struct _mp_obj_array_it_t {
mp_obj_base_t base;
mp_obj_array_t *array;
machine_uint_t cur;
} mp_obj_array_it_t;
STATIC mp_obj_t array_it_iternext(mp_obj_t self_in) {
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mp_obj_array_it_t *self = self_in;
if (self->cur < self->array->len) {
return mp_binary_get_val_array(self->array->typecode, self->array->items, self->cur++);
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} else {
return MP_OBJ_STOP_ITERATION;
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}
}
STATIC const mp_obj_type_t array_it_type = {
{ &mp_type_type },
.name = MP_QSTR_iterator,
.getiter = mp_identity,
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.iternext = array_it_iternext,
};
STATIC mp_obj_t array_iterator_new(mp_obj_t array_in) {
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mp_obj_array_t *array = array_in;
mp_obj_array_it_t *o = m_new_obj(mp_obj_array_it_t);
o->base.type = &array_it_type;
o->array = array;
o->cur = 0;
return o;
}