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objstr.c
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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
* Copyright (c) 2014-2018 Paul Sokolovsky
*
* 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/unicode.h"
#include "py/objstr.h"
#include "py/objlist.h"
#include "py/runtime.h"
#include "py/cstack.h"
#if MICROPY_PY_BUILTINS_STR_OP_MODULO
static mp_obj_t str_modulo_format(mp_obj_t pattern, size_t n_args, const mp_obj_t *args, mp_obj_t dict);
#endif
static mp_obj_t mp_obj_new_bytes_iterator(mp_obj_t str, mp_obj_iter_buf_t *iter_buf);
static NORETURN void bad_implicit_conversion(mp_obj_t self_in);
static mp_obj_t mp_obj_new_str_type_from_vstr(const mp_obj_type_t *type, vstr_t *vstr);
static void str_check_arg_type(const mp_obj_type_t *self_type, const mp_obj_t arg) {
// String operations generally need the args type to match the object they're called on,
// e.g. str.find(str), byte.startswith(byte)
// with the exception that bytes may be used for bytearray and vice versa.
const mp_obj_type_t *arg_type = mp_obj_get_type(arg);
#if MICROPY_PY_BUILTINS_BYTEARRAY
if (arg_type == &mp_type_bytearray) {
arg_type = &mp_type_bytes;
}
if (self_type == &mp_type_bytearray) {
self_type = &mp_type_bytes;
}
#endif
if (arg_type != self_type) {
bad_implicit_conversion(arg);
}
}
static void check_is_str_or_bytes(mp_obj_t self_in) {
mp_check_self(mp_obj_is_str_or_bytes(self_in));
}
/******************************************************************************/
/* str */
void mp_str_print_quoted(const mp_print_t *print, const byte *str_data, size_t str_len, bool is_bytes) {
// this escapes characters, but it will be very slow to print (calling print many times)
bool has_single_quote = false;
bool has_double_quote = false;
for (const byte *s = str_data, *top = str_data + str_len; !has_double_quote && s < top; s++) {
if (*s == '\'') {
has_single_quote = true;
} else if (*s == '"') {
has_double_quote = true;
}
}
int quote_char = '\'';
if (has_single_quote && !has_double_quote) {
quote_char = '"';
}
mp_printf(print, "%c", quote_char);
for (const byte *s = str_data, *top = str_data + str_len; s < top; s++) {
if (*s == quote_char) {
mp_printf(print, "\\%c", quote_char);
} else if (*s == '\\') {
mp_print_str(print, "\\\\");
} else if (*s >= 0x20 && *s != 0x7f && (!is_bytes || *s < 0x80)) {
// In strings, anything which is not ascii control character
// is printed as is, this includes characters in range 0x80-0xff
// (which can be non-Latin letters, etc.)
mp_printf(print, "%c", *s);
} else if (*s == '\n') {
mp_print_str(print, "\\n");
} else if (*s == '\r') {
mp_print_str(print, "\\r");
} else if (*s == '\t') {
mp_print_str(print, "\\t");
} else {
mp_printf(print, "\\x%02x", *s);
}
}
mp_printf(print, "%c", quote_char);
}
#if MICROPY_PY_JSON
void mp_str_print_json(const mp_print_t *print, const byte *str_data, size_t str_len) {
// for JSON spec, see http://www.ietf.org/rfc/rfc4627.txt
// if we are given a valid utf8-encoded string, we will print it in a JSON-conforming way
mp_print_str(print, "\"");
for (const byte *s = str_data, *top = str_data + str_len; s < top; s++) {
if (*s == '"' || *s == '\\') {
mp_printf(print, "\\%c", *s);
} else if (*s >= 32) {
// this will handle normal and utf-8 encoded chars
mp_printf(print, "%c", *s);
} else if (*s == '\n') {
mp_print_str(print, "\\n");
} else if (*s == '\r') {
mp_print_str(print, "\\r");
} else if (*s == '\t') {
mp_print_str(print, "\\t");
} else {
// this will handle control chars
mp_printf(print, "\\u%04x", *s);
}
}
mp_print_str(print, "\"");
}
#endif
static void str_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
GET_STR_DATA_LEN(self_in, str_data, str_len);
#if MICROPY_PY_JSON
if (kind == PRINT_JSON) {
mp_str_print_json(print, str_data, str_len);
return;
}
#endif
#if !MICROPY_PY_BUILTINS_STR_UNICODE
bool is_bytes = mp_obj_is_type(self_in, &mp_type_bytes);
#else
bool is_bytes = true;
#endif
if (kind == PRINT_RAW || (!MICROPY_PY_BUILTINS_STR_UNICODE && kind == PRINT_STR && !is_bytes)) {
print->print_strn(print->data, (const char *)str_data, str_len);
} else {
if (is_bytes) {
print->print_strn(print->data, "b", 1);
}
mp_str_print_quoted(print, str_data, str_len, is_bytes);
}
}
mp_obj_t mp_obj_str_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
#if MICROPY_CPYTHON_COMPAT
if (n_kw != 0) {
mp_arg_error_unimpl_kw();
}
#endif
mp_arg_check_num(n_args, n_kw, 0, 3, false);
switch (n_args) {
case 0:
return MP_OBJ_NEW_QSTR(MP_QSTR_);
case 1: {
vstr_t vstr;
mp_print_t print;
vstr_init_print(&vstr, 16, &print);
mp_obj_print_helper(&print, args[0], PRINT_STR);
return mp_obj_new_str_type_from_vstr(type, &vstr);
}
default: // 2 or 3 args
// TODO: validate 2nd/3rd args
if (mp_obj_is_type(args[0], &mp_type_bytes)) {
GET_STR_DATA_LEN(args[0], str_data, str_len);
GET_STR_HASH(args[0], str_hash);
if (str_hash == 0) {
str_hash = qstr_compute_hash(str_data, str_len);
}
#if MICROPY_PY_BUILTINS_STR_UNICODE_CHECK
if (!utf8_check(str_data, str_len)) {
mp_raise_msg(&mp_type_UnicodeError, NULL);
}
#endif
// Check if a qstr with this data already exists
qstr q = qstr_find_strn((const char *)str_data, str_len);
if (q != MP_QSTRnull) {
return MP_OBJ_NEW_QSTR(q);
}
mp_obj_str_t *o = MP_OBJ_TO_PTR(mp_obj_new_str_copy(type, NULL, str_len));
o->data = str_data;
o->hash = str_hash;
return MP_OBJ_FROM_PTR(o);
} else {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);
// This will utf-8 check the input.
return mp_obj_new_str(bufinfo.buf, bufinfo.len);
}
}
}
static mp_obj_t bytes_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
(void)type_in;
#if MICROPY_CPYTHON_COMPAT
if (n_kw != 0) {
mp_arg_error_unimpl_kw();
}
#else
(void)n_kw;
#endif
if (n_args == 0) {
return mp_const_empty_bytes;
}
if (mp_obj_is_type(args[0], &mp_type_bytes)) {
return args[0];
}
if (mp_obj_is_str(args[0])) {
if (n_args < 2 || n_args > 3) {
#if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
goto wrong_args;
#else
mp_raise_TypeError(MP_ERROR_TEXT("string argument without an encoding"));
#endif
}
GET_STR_DATA_LEN(args[0], str_data, str_len);
GET_STR_HASH(args[0], str_hash);
if (str_hash == 0) {
str_hash = qstr_compute_hash(str_data, str_len);
}
mp_obj_str_t *o = MP_OBJ_TO_PTR(mp_obj_new_str_copy(&mp_type_bytes, NULL, str_len));
o->data = str_data;
o->hash = str_hash;
return MP_OBJ_FROM_PTR(o);
}
if (n_args > 1) {
goto wrong_args;
}
if (mp_obj_is_small_int(args[0])) {
mp_int_t len = MP_OBJ_SMALL_INT_VALUE(args[0]);
if (len < 0) {
mp_raise_ValueError(NULL);
}
vstr_t vstr;
vstr_init_len(&vstr, len);
memset(vstr.buf, 0, len);
return mp_obj_new_bytes_from_vstr(&vstr);
}
// check if argument has the buffer protocol
mp_buffer_info_t bufinfo;
if (mp_get_buffer(args[0], &bufinfo, MP_BUFFER_READ)) {
return mp_obj_new_bytes(bufinfo.buf, bufinfo.len);
}
vstr_t vstr;
// 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) {
vstr_init(&vstr, 16);
} else {
mp_int_t len = MP_OBJ_SMALL_INT_VALUE(len_in);
vstr_init(&vstr, len);
}
mp_obj_iter_buf_t iter_buf;
mp_obj_t iterable = mp_getiter(args[0], &iter_buf);
mp_obj_t item;
while ((item = mp_iternext(iterable)) != MP_OBJ_STOP_ITERATION) {
mp_int_t val = mp_obj_get_int(item);
#if MICROPY_FULL_CHECKS
if (val < 0 || val > 255) {
mp_raise_ValueError(MP_ERROR_TEXT("bytes value out of range"));
}
#endif
vstr_add_byte(&vstr, val);
}
return mp_obj_new_bytes_from_vstr(&vstr);
wrong_args:
mp_raise_TypeError(MP_ERROR_TEXT("wrong number of arguments"));
}
// like strstr but with specified length and allows \0 bytes
// TODO replace with something more efficient/standard
const byte *find_subbytes(const byte *haystack, size_t hlen, const byte *needle, size_t nlen, int direction) {
if (hlen >= nlen) {
size_t str_index, str_index_end;
if (direction > 0) {
str_index = 0;
str_index_end = hlen - nlen;
} else {
str_index = hlen - nlen;
str_index_end = 0;
}
for (;;) {
if (memcmp(&haystack[str_index], needle, nlen) == 0) {
// found
return haystack + str_index;
}
if (str_index == str_index_end) {
// not found
break;
}
str_index += direction;
}
}
return NULL;
}
// Note: this function is used to check if an object is a str or bytes, which
// works because both those types use it as their binary_op method. Revisit
// mp_obj_is_str_or_bytes if this fact changes.
mp_obj_t mp_obj_str_binary_op(mp_binary_op_t op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
// check for modulo
if (op == MP_BINARY_OP_MODULO) {
#if MICROPY_PY_BUILTINS_STR_OP_MODULO
mp_obj_t *args = &rhs_in;
size_t n_args = 1;
mp_obj_t dict = MP_OBJ_NULL;
if (mp_obj_is_type(rhs_in, &mp_type_tuple)) {
// TODO: Support tuple subclasses?
mp_obj_tuple_get(rhs_in, &n_args, &args);
} else if (mp_obj_is_type(rhs_in, &mp_type_dict)) {
dict = rhs_in;
}
return str_modulo_format(lhs_in, n_args, args, dict);
#else
return MP_OBJ_NULL;
#endif
}
// from now on we need lhs type and data, so extract them
const mp_obj_type_t *lhs_type = mp_obj_get_type(lhs_in);
GET_STR_DATA_LEN(lhs_in, lhs_data, lhs_len);
// check for multiply
if (op == MP_BINARY_OP_MULTIPLY) {
mp_int_t n;
if (!mp_obj_get_int_maybe(rhs_in, &n)) {
return MP_OBJ_NULL; // op not supported
}
if (n <= 0) {
if (lhs_type == &mp_type_str) {
return MP_OBJ_NEW_QSTR(MP_QSTR_); // empty str
} else {
return mp_const_empty_bytes;
}
}
vstr_t vstr;
vstr_init_len(&vstr, lhs_len * n);
mp_seq_multiply(lhs_data, sizeof(*lhs_data), lhs_len, n, vstr.buf);
return mp_obj_new_str_type_from_vstr(lhs_type, &vstr);
}
// From now on all operations allow:
// - str with str
// - bytes with bytes
// - bytes with bytearray
// - bytes with array.array
// To do this efficiently we use the buffer protocol to extract the raw
// data for the rhs, but only if the lhs is a bytes object.
//
// NOTE: CPython does not allow comparison between bytes ard array.array
// (even if the array is of type 'b'), even though it allows addition of
// such types. We are not compatible with this (we do allow comparison
// of bytes with anything that has the buffer protocol). It would be
// easy to "fix" this with a bit of extra logic below, but it costs code
// size and execution time so we don't.
const byte *rhs_data;
size_t rhs_len;
if (lhs_type == mp_obj_get_type(rhs_in)) {
GET_STR_DATA_LEN(rhs_in, rhs_data_, rhs_len_);
rhs_data = rhs_data_;
rhs_len = rhs_len_;
} else if (lhs_type == &mp_type_bytes) {
mp_buffer_info_t bufinfo;
if (!mp_get_buffer(rhs_in, &bufinfo, MP_BUFFER_READ)) {
return MP_OBJ_NULL; // op not supported
}
rhs_data = bufinfo.buf;
rhs_len = bufinfo.len;
} else {
// LHS is str and RHS has an incompatible type
// (except if operation is EQUAL, but that's handled by mp_obj_equal)
// CONTAINS must fail with a bad-implicit-conversion exception, because
// otherwise mp_binary_op() will fallback to `list(lhs).__contains__(rhs)`.
if (op == MP_BINARY_OP_CONTAINS) {
bad_implicit_conversion(rhs_in);
}
// All other operations are not supported, and may be handled by another
// type, eg for reverse operations.
return MP_OBJ_NULL;
}
switch (op) {
case MP_BINARY_OP_ADD:
case MP_BINARY_OP_INPLACE_ADD: {
if (lhs_len == 0 && mp_obj_get_type(rhs_in) == lhs_type) {
return rhs_in;
}
if (rhs_len == 0) {
return lhs_in;
}
vstr_t vstr;
vstr_init_len(&vstr, lhs_len + rhs_len);
memcpy(vstr.buf, lhs_data, lhs_len);
memcpy(vstr.buf + lhs_len, rhs_data, rhs_len);
return mp_obj_new_str_type_from_vstr(lhs_type, &vstr);
}
case MP_BINARY_OP_CONTAINS:
return mp_obj_new_bool(find_subbytes(lhs_data, lhs_len, rhs_data, rhs_len, 1) != NULL);
// case MP_BINARY_OP_NOT_EQUAL: // This is never passed here
case MP_BINARY_OP_EQUAL: // This will be passed only for bytes, str is dealt with in mp_obj_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_obj_new_bool(mp_seq_cmp_bytes(op, lhs_data, lhs_len, rhs_data, rhs_len));
default:
return MP_OBJ_NULL; // op not supported
}
}
#if !MICROPY_PY_BUILTINS_STR_UNICODE
// objstrunicode defines own version
const byte *str_index_to_ptr(const mp_obj_type_t *type, const byte *self_data, size_t self_len,
mp_obj_t index, bool is_slice) {
size_t index_val = mp_get_index(type, self_len, index, is_slice);
return self_data + index_val;
}
#endif
// This is used for both bytes and 8-bit strings. This is not used for unicode strings.
static mp_obj_t bytes_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
const mp_obj_type_t *type = mp_obj_get_type(self_in);
GET_STR_DATA_LEN(self_in, self_data, self_len);
if (value == MP_OBJ_SENTINEL) {
// load
#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)) {
mp_raise_NotImplementedError(MP_ERROR_TEXT("only slices with step=1 (aka None) are supported"));
}
return mp_obj_new_str_of_type(type, self_data + slice.start, slice.stop - slice.start);
}
#endif
size_t index_val = mp_get_index(type, self_len, index, false);
// If we have unicode enabled the type will always be bytes, so take the short cut.
if (MICROPY_PY_BUILTINS_STR_UNICODE || type == &mp_type_bytes) {
return MP_OBJ_NEW_SMALL_INT(self_data[index_val]);
} else {
return mp_obj_new_str_via_qstr((char *)&self_data[index_val], 1);
}
} else {
return MP_OBJ_NULL; // op not supported
}
}
static mp_obj_t str_join(mp_obj_t self_in, mp_obj_t arg) {
check_is_str_or_bytes(self_in);
const mp_obj_type_t *self_type = mp_obj_get_type(self_in);
const mp_obj_type_t *ret_type = self_type;
// get separation string
GET_STR_DATA_LEN(self_in, sep_str, sep_len);
// process args
size_t seq_len;
mp_obj_t *seq_items;
if (!mp_obj_is_type(arg, &mp_type_list) && !mp_obj_is_type(arg, &mp_type_tuple)) {
// arg is not a list nor a tuple, try to convert it to a list
// TODO: Try to optimize?
arg = mp_obj_list_make_new(&mp_type_list, 1, 0, &arg);
}
mp_obj_get_array(arg, &seq_len, &seq_items);
// count required length
size_t required_len = 0;
#if MICROPY_PY_BUILTINS_BYTEARRAY
if (self_type == &mp_type_bytearray) {
self_type = &mp_type_bytes;
}
#endif
for (size_t i = 0; i < seq_len; i++) {
const mp_obj_type_t *seq_type = mp_obj_get_type(seq_items[i]);
#if MICROPY_PY_BUILTINS_BYTEARRAY
if (seq_type == &mp_type_bytearray) {
seq_type = &mp_type_bytes;
}
#endif
if (seq_type != self_type) {
mp_raise_TypeError(
MP_ERROR_TEXT("join expects a list of str/bytes objects consistent with self object"));
}
if (i > 0) {
required_len += sep_len;
}
GET_STR_LEN(seq_items[i], l);
required_len += l;
}
// make joined string
vstr_t vstr;
vstr_init_len(&vstr, required_len);
byte *data = (byte *)vstr.buf;
for (size_t i = 0; i < seq_len; i++) {
if (i > 0) {
memcpy(data, sep_str, sep_len);
data += sep_len;
}
GET_STR_DATA_LEN(seq_items[i], s, l);
memcpy(data, s, l);
data += l;
}
// return joined string
return mp_obj_new_str_type_from_vstr(ret_type, &vstr);
}
MP_DEFINE_CONST_FUN_OBJ_2(str_join_obj, str_join);
mp_obj_t mp_obj_str_split(size_t n_args, const mp_obj_t *args) {
const mp_obj_type_t *self_type = mp_obj_get_type(args[0]);
mp_int_t splits = -1;
mp_obj_t sep = mp_const_none;
if (n_args > 1) {
sep = args[1];
if (n_args > 2) {
splits = mp_obj_get_int(args[2]);
}
}
mp_obj_t res = mp_obj_new_list(0, NULL);
GET_STR_DATA_LEN(args[0], s, len);
const byte *top = s + len;
if (sep == mp_const_none) {
// sep not given, so separate on whitespace
// Initial whitespace is not counted as split, so we pre-do it
while (s < top && unichar_isspace(*s)) {
s++;
}
while (s < top && splits != 0) {
const byte *start = s;
while (s < top && !unichar_isspace(*s)) {
s++;
}
mp_obj_list_append(res, mp_obj_new_str_of_type(self_type, start, s - start));
if (s >= top) {
break;
}
while (s < top && unichar_isspace(*s)) {
s++;
}
if (splits > 0) {
splits--;
}
}
if (s < top) {
mp_obj_list_append(res, mp_obj_new_str_of_type(self_type, s, top - s));
}
} else {
// sep given
str_check_arg_type(self_type, sep);
size_t sep_len;
const char *sep_str = mp_obj_str_get_data(sep, &sep_len);
if (sep_len == 0) {
mp_raise_ValueError(MP_ERROR_TEXT("empty separator"));
}
for (;;) {
const byte *start = s;
for (;;) {
if (splits == 0 || s + sep_len > top) {
s = top;
break;
} else if (memcmp(s, sep_str, sep_len) == 0) {
break;
}
s++;
}
mp_obj_list_append(res, mp_obj_new_str_of_type(self_type, start, s - start));
if (s >= top) {
break;
}
s += sep_len;
if (splits > 0) {
splits--;
}
}
}
return res;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_split_obj, 1, 3, mp_obj_str_split);
#if MICROPY_PY_BUILTINS_STR_SPLITLINES
static mp_obj_t str_splitlines(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_keepends };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_keepends, 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);
const mp_obj_type_t *self_type = mp_obj_get_type(pos_args[0]);
mp_obj_t res = mp_obj_new_list(0, NULL);
GET_STR_DATA_LEN(pos_args[0], s, len);
const byte *top = s + len;
while (s < top) {
const byte *start = s;
size_t match = 0;
while (s < top) {
if (*s == '\n') {
match = 1;
break;
} else if (*s == '\r') {
if (s[1] == '\n') {
match = 2;
} else {
match = 1;
}
break;
}
s++;
}
size_t sub_len = s - start;
if (args[ARG_keepends].u_bool) {
sub_len += match;
}
mp_obj_list_append(res, mp_obj_new_str_of_type(self_type, start, sub_len));
s += match;
}
return res;
}
MP_DEFINE_CONST_FUN_OBJ_KW(str_splitlines_obj, 1, str_splitlines);
#endif
static mp_obj_t str_rsplit(size_t n_args, const mp_obj_t *args) {
if (n_args < 3) {
// If we don't have split limit, it doesn't matter from which side
// we split.
return mp_obj_str_split(n_args, args);
}
const mp_obj_type_t *self_type = mp_obj_get_type(args[0]);
mp_obj_t sep = args[1];
GET_STR_DATA_LEN(args[0], s, len);
mp_int_t splits = mp_obj_get_int(args[2]);
if (splits < 0) {
// Negative limit means no limit, so delegate to split().
return mp_obj_str_split(n_args, args);
}
mp_int_t org_splits = splits;
// Preallocate list to the max expected # of elements, as we
// will fill it from the end.
mp_obj_list_t *res = MP_OBJ_TO_PTR(mp_obj_new_list(splits + 1, NULL));
mp_int_t idx = splits;
if (sep == mp_const_none) {
mp_raise_NotImplementedError(MP_ERROR_TEXT("rsplit(None,n)"));
} else {
size_t sep_len;
const char *sep_str = mp_obj_str_get_data(sep, &sep_len);
if (sep_len == 0) {
mp_raise_ValueError(MP_ERROR_TEXT("empty separator"));
}
const byte *beg = s;
const byte *last = s + len;
for (;;) {
s = last - sep_len;
for (;;) {
if (splits == 0 || s < beg) {
break;
} else if (memcmp(s, sep_str, sep_len) == 0) {
break;
}
s--;
}
if (s < beg || splits == 0) {
res->items[idx] = mp_obj_new_str_of_type(self_type, beg, last - beg);
break;
}
res->items[idx--] = mp_obj_new_str_of_type(self_type, s + sep_len, last - s - sep_len);
last = s;
splits--;
}
if (idx != 0) {
// We split less parts than split limit, now go cleanup surplus
size_t used = org_splits + 1 - idx;
memmove(res->items, &res->items[idx], used * sizeof(mp_obj_t));
mp_seq_clear(res->items, used, res->alloc, sizeof(*res->items));
res->len = used;
}
}
return MP_OBJ_FROM_PTR(res);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_rsplit_obj, 1, 3, str_rsplit);
static mp_obj_t str_finder(size_t n_args, const mp_obj_t *args, int direction, bool is_index) {
const mp_obj_type_t *self_type = mp_obj_get_type(args[0]);
check_is_str_or_bytes(args[0]);
// check argument type
str_check_arg_type(self_type, args[1]);
GET_STR_DATA_LEN(args[0], haystack, haystack_len);
GET_STR_DATA_LEN(args[1], needle, needle_len);
const byte *start = haystack;
const byte *end = haystack + haystack_len;
if (n_args >= 3 && args[2] != mp_const_none) {
start = str_index_to_ptr(self_type, haystack, haystack_len, args[2], true);
}
if (n_args >= 4 && args[3] != mp_const_none) {
end = str_index_to_ptr(self_type, haystack, haystack_len, args[3], true);
}
if (end < start) {
goto out_error;
}
const byte *p = find_subbytes(start, end - start, needle, needle_len, direction);
if (p == NULL) {
out_error:
// not found
if (is_index) {
mp_raise_ValueError(MP_ERROR_TEXT("substring not found"));
} else {
return MP_OBJ_NEW_SMALL_INT(-1);
}
} else {
// found
#if MICROPY_PY_BUILTINS_STR_UNICODE
if (self_type == &mp_type_str) {
return MP_OBJ_NEW_SMALL_INT(utf8_ptr_to_index(haystack, p));
}
#endif
return MP_OBJ_NEW_SMALL_INT(p - haystack);
}
}
static mp_obj_t str_find(size_t n_args, const mp_obj_t *args) {
return str_finder(n_args, args, 1, false);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_find_obj, 2, 4, str_find);
static mp_obj_t str_rfind(size_t n_args, const mp_obj_t *args) {
return str_finder(n_args, args, -1, false);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_rfind_obj, 2, 4, str_rfind);
static mp_obj_t str_index(size_t n_args, const mp_obj_t *args) {
return str_finder(n_args, args, 1, true);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_index_obj, 2, 4, str_index);
static mp_obj_t str_rindex(size_t n_args, const mp_obj_t *args) {
return str_finder(n_args, args, -1, true);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_rindex_obj, 2, 4, str_rindex);
// TODO: (Much) more variety in args
static mp_obj_t str_startswith(size_t n_args, const mp_obj_t *args) {
const mp_obj_type_t *self_type = mp_obj_get_type(args[0]);
GET_STR_DATA_LEN(args[0], str, str_len);
size_t prefix_len;
const char *prefix = mp_obj_str_get_data(args[1], &prefix_len);
const byte *start = str;
if (n_args > 2) {
start = str_index_to_ptr(self_type, str, str_len, args[2], true);
}
if (prefix_len + (start - str) > str_len) {
return mp_const_false;
}
return mp_obj_new_bool(memcmp(start, prefix, prefix_len) == 0);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_startswith_obj, 2, 3, str_startswith);
static mp_obj_t str_endswith(size_t n_args, const mp_obj_t *args) {
GET_STR_DATA_LEN(args[0], str, str_len);
size_t suffix_len;
const char *suffix = mp_obj_str_get_data(args[1], &suffix_len);
if (n_args > 2) {
mp_raise_NotImplementedError(MP_ERROR_TEXT("start/end indices"));
}
if (suffix_len > str_len) {
return mp_const_false;
}
return mp_obj_new_bool(memcmp(str + (str_len - suffix_len), suffix, suffix_len) == 0);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_endswith_obj, 2, 3, str_endswith);
enum { LSTRIP, RSTRIP, STRIP };
static mp_obj_t str_uni_strip(int type, size_t n_args, const mp_obj_t *args) {
check_is_str_or_bytes(args[0]);
const mp_obj_type_t *self_type = mp_obj_get_type(args[0]);
const byte *chars_to_del;
uint chars_to_del_len;
static const byte whitespace[] = " \t\n\r\v\f";
if (n_args == 1) {
chars_to_del = whitespace;
chars_to_del_len = sizeof(whitespace) - 1;
} else {
str_check_arg_type(self_type, args[1]);
GET_STR_DATA_LEN(args[1], s, l);
chars_to_del = s;
chars_to_del_len = l;
}
GET_STR_DATA_LEN(args[0], orig_str, orig_str_len);
size_t first_good_char_pos = 0;
bool first_good_char_pos_set = false;
size_t last_good_char_pos = 0;
size_t i = 0;
int delta = 1;
if (type == RSTRIP) {
i = orig_str_len - 1;
delta = -1;
}
for (size_t len = orig_str_len; len > 0; len--) {
if (find_subbytes(chars_to_del, chars_to_del_len, &orig_str[i], 1, 1) == NULL) {
if (!first_good_char_pos_set) {
first_good_char_pos_set = true;
first_good_char_pos = i;
if (type == LSTRIP) {
last_good_char_pos = orig_str_len - 1;
break;
} else if (type == RSTRIP) {
first_good_char_pos = 0;
last_good_char_pos = i;
break;
}
}
last_good_char_pos = i;
}
i += delta;
}
if (!first_good_char_pos_set) {
// string is all whitespace, return ''
if (self_type == &mp_type_str) {
return MP_OBJ_NEW_QSTR(MP_QSTR_);
} else {
return mp_const_empty_bytes;
}
}
assert(last_good_char_pos >= first_good_char_pos);
// +1 to accommodate the last character
size_t stripped_len = last_good_char_pos - first_good_char_pos + 1;
if (stripped_len == orig_str_len) {
// If nothing was stripped, don't bother to dup original string
// TODO: watch out for this case when we'll get to bytearray.strip()
assert(first_good_char_pos == 0);
return args[0];
}
return mp_obj_new_str_of_type(self_type, orig_str + first_good_char_pos, stripped_len);
}
static mp_obj_t str_strip(size_t n_args, const mp_obj_t *args) {
return str_uni_strip(STRIP, n_args, args);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_strip_obj, 1, 2, str_strip);
static mp_obj_t str_lstrip(size_t n_args, const mp_obj_t *args) {
return str_uni_strip(LSTRIP, n_args, args);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_lstrip_obj, 1, 2, str_lstrip);
static mp_obj_t str_rstrip(size_t n_args, const mp_obj_t *args) {
return str_uni_strip(RSTRIP, n_args, args);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_rstrip_obj, 1, 2, str_rstrip);
#if MICROPY_PY_BUILTINS_STR_CENTER
static mp_obj_t str_center(mp_obj_t str_in, mp_obj_t width_in) {
GET_STR_DATA_LEN(str_in, str, str_len);
mp_uint_t width = mp_obj_get_int(width_in);
if (str_len >= width) {
return str_in;
}
vstr_t vstr;
vstr_init_len(&vstr, width);
memset(vstr.buf, ' ', width);
int left = (width - str_len) / 2;
memcpy(vstr.buf + left, str, str_len);
return mp_obj_new_str_type_from_vstr(mp_obj_get_type(str_in), &vstr);
}
MP_DEFINE_CONST_FUN_OBJ_2(str_center_obj, str_center);
#endif
// Takes an int arg, but only parses unsigned numbers, and only changes
// *num if at least one digit was parsed.
static const char *str_to_int(const char *str, const char *top, int *num) {
if (str < top && '0' <= *str && *str <= '9') {
*num = 0;
do {
*num = *num * 10 + (*str - '0');
str++;
}
while (str < top && '0' <= *str && *str <= '9');
}
return str;
}
static bool isalignment(char ch) {
return ch && strchr("<>=^", ch) != NULL;
}
static bool istype(char ch) {
return ch && strchr("bcdeEfFgGnosxX%", ch) != NULL;
}
static bool arg_looks_integer(mp_obj_t arg) {
return mp_obj_is_bool(arg) || mp_obj_is_int(arg);
}
static bool arg_looks_numeric(mp_obj_t arg) {
return arg_looks_integer(arg)
#if MICROPY_PY_BUILTINS_FLOAT
|| mp_obj_is_float(arg)
#endif
;
}
#if MICROPY_PY_BUILTINS_STR_OP_MODULO
static mp_obj_t arg_as_int(mp_obj_t arg) {
#if MICROPY_PY_BUILTINS_FLOAT
if (mp_obj_is_float(arg)) {
return mp_obj_new_int_from_float(mp_obj_float_get(arg));
}
#endif
return arg;
}
#endif
#if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
static NORETURN void terse_str_format_value_error(void) {
mp_raise_ValueError(MP_ERROR_TEXT("bad format string"));
}
#else
// define to nothing to improve coverage
#define terse_str_format_value_error()
#endif
static vstr_t mp_obj_str_format_helper(const char *str, const char *top, int *arg_i, size_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
vstr_t vstr;
mp_print_t print;
vstr_init_print(&vstr, 16, &print);
for (; str < top; str++) {