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py: Make 'bytes' be a proper type, support standard constructor args.

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This commit is contained in:
Paul Sokolovsky
2014-03-21 23:46:59 +02:00
parent be020c27a8
commit 1ecea7c753
4 changed files with 105 additions and 14 deletions
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77
py/objstr.c
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@@ -17,6 +17,8 @@ typedef struct _mp_obj_str_t {
const byte *data;
} mp_obj_str_t;
const mp_obj_t mp_const_empty_bytes;
// use this macro to extract the string hash
#define GET_STR_HASH(str_obj_in, str_hash) uint str_hash; if (MP_OBJ_IS_QSTR(str_obj_in)) { str_hash = qstr_hash(MP_OBJ_QSTR_VALUE(str_obj_in)); } else { str_hash = ((mp_obj_str_t*)str_obj_in)->hash; }
@@ -113,6 +115,75 @@ STATIC mp_obj_t str_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_
}
}
STATIC mp_obj_t bytes_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
if (n_args == 0) {
return mp_const_empty_bytes;
}
if (MP_OBJ_IS_STR(args[0])) {
if (n_args < 2 || n_args > 3) {
goto wrong_args;
}
GET_STR_DATA_LEN(args[0], str_data, str_len);
GET_STR_HASH(args[0], str_hash);
mp_obj_str_t *o = str_new(&bytes_type, NULL, str_len);
o->data = str_data;
o->hash = str_hash;
return o;
}
if (n_args > 1) {
goto wrong_args;
}
if (MP_OBJ_IS_SMALL_INT(args[0])) {
uint len = MP_OBJ_SMALL_INT_VALUE(args[0]);
byte *data;
mp_obj_t o = mp_obj_str_builder_start(&bytes_type, len, &data);
memset(data, 0, len);
return mp_obj_str_builder_end(o);
}
int len;
byte *data;
vstr_t *vstr = NULL;
mp_obj_t o = NULL;
// Try to create array of exact len if initializer len is known
mp_obj_t len_in = mp_obj_len_maybe(args[0]);
if (len_in == MP_OBJ_NULL) {
len = -1;
vstr = vstr_new();
} else {
len = MP_OBJ_SMALL_INT_VALUE(len_in);
o = mp_obj_str_builder_start(&bytes_type, len, &data);
}
mp_obj_t iterable = rt_getiter(args[0]);
mp_obj_t item;
while ((item = rt_iternext(iterable)) != mp_const_stop_iteration) {
if (len == -1) {
vstr_add_char(vstr, MP_OBJ_SMALL_INT_VALUE(item));
} else {
*data++ = MP_OBJ_SMALL_INT_VALUE(item);
}
}
if (len == -1) {
vstr_shrink(vstr);
// TODO: Optimize, borrow buffer from vstr
len = vstr_len(vstr);
o = mp_obj_str_builder_start(&bytes_type, len, &data);
memcpy(data, vstr_str(vstr), len);
vstr_free(vstr);
}
return mp_obj_str_builder_end(o);
wrong_args:
nlr_jump(mp_obj_new_exception_msg(&mp_type_TypeError, "wrong number of arguments"));
}
// like strstr but with specified length and allows \0 bytes
// TODO replace with something more efficient/standard
STATIC const byte *find_subbytes(const byte *haystack, uint hlen, const byte *needle, uint nlen) {
@@ -666,11 +737,16 @@ const mp_obj_type_t bytes_type = {
{ &mp_type_type },
.name = MP_QSTR_bytes,
.print = str_print,
.make_new = bytes_make_new,
.binary_op = str_binary_op,
.getiter = mp_obj_new_bytes_iterator,
.methods = str_type_methods,
};
// the zero-length bytes
STATIC const mp_obj_str_t empty_bytes_obj = {{&bytes_type}, 0, 0, NULL};
const mp_obj_t mp_const_empty_bytes = (mp_obj_t)&empty_bytes_obj;
mp_obj_t mp_obj_str_builder_start(const mp_obj_type_t *type, uint len, byte **data) {
mp_obj_str_t *o = m_new_obj(mp_obj_str_t);
o->base.type = type;
@@ -682,7 +758,6 @@ mp_obj_t mp_obj_str_builder_start(const mp_obj_type_t *type, uint len, byte **da
}
mp_obj_t mp_obj_str_builder_end(mp_obj_t o_in) {
assert(MP_OBJ_IS_STR(o_in));
mp_obj_str_t *o = o_in;
o->hash = qstr_compute_hash(o->data, o->len);
byte *p = (byte*)o->data;