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circuitpython/py/objstrunicode.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) 2014-2016 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/objstr.h"
#include "py/objlist.h"
#include "py/runtime.h"
#include "supervisor/shared/translate/translate.h"
#if MICROPY_PY_BUILTINS_STR_UNICODE
STATIC mp_obj_t mp_obj_new_str_iterator(mp_obj_t str, mp_obj_iter_buf_t *iter_buf);
/******************************************************************************/
/* str */
// These settings approximate CPython's printability. It is not
// exhaustive and may print "unprintable" characters. All ASCII control codes
// are escaped along with variable space widths and paragraph designators.
// Unlike CPython, we do not escape private use codes or reserved characters.
// We assume that the unicode is well formed.
// CPython policy is documented here: https://github.com/python/cpython/blob/bb3e0c240bc60fe08d332ff5955d54197f79751c/Objects/unicodectype.c#L147-L159
STATIC void uni_print_quoted(const mp_print_t *print, const byte *str_data, uint str_len) {
// 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;
}
}
unichar quote_char = '\'';
if (has_single_quote && !has_double_quote) {
quote_char = '"';
}
mp_printf(print, "%c", quote_char);
const byte *s = str_data, *top = str_data + str_len;
while (s < top) {
unichar ch;
ch = utf8_get_char(s);
const byte *start = s;
s = utf8_next_char(s);
if (ch == quote_char) {
mp_printf(print, "\\%c", quote_char);
} else if (ch == '\\') {
mp_print_str(print, "\\\\");
} else if (ch == '\n') {
mp_print_str(print, "\\n");
} else if (ch == '\r') {
mp_print_str(print, "\\r");
} else if (ch == '\t') {
mp_print_str(print, "\\t");
} else if (ch <= 0x1f || (0x7f <= ch && ch <= 0xa0) || ch == 0xad) {
mp_printf(print, "\\x%02x", ch);
} else if ((0x2000 <= ch && ch <= 0x200f) || ch == 0x2028 || ch == 0x2029) {
mp_printf(print, "\\u%04x", ch);
} else {
// Print the full character out.
int width = s - start;
mp_print_strn(print, (const char *)start, width, 0, ' ', width);
}
}
mp_printf(print, "%c", quote_char);
}
STATIC void uni_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_UJSON
if (kind == PRINT_JSON) {
mp_str_print_json(print, str_data, str_len);
return;
}
#endif
if (kind == PRINT_STR) {
print->print_strn(print->data, (const char *)str_data, str_len);
} else {
uni_print_quoted(print, str_data, str_len);
}
}
STATIC mp_obj_t uni_unary_op(mp_unary_op_t op, mp_obj_t self_in) {
GET_STR_DATA_LEN(self_in, str_data, str_len);
switch (op) {
case MP_UNARY_OP_BOOL:
return mp_obj_new_bool(str_len != 0);
case MP_UNARY_OP_LEN:
return MP_OBJ_NEW_SMALL_INT(utf8_charlen(str_data, str_len));
default:
return MP_OBJ_NULL; // op not supported
}
}
size_t str_offset_to_index(const mp_obj_type_t *type, const byte *self_data, size_t self_len,
size_t offset) {
if (offset > self_len) {
mp_raise_ValueError(MP_ERROR_TEXT("offset out of bounds"));
}
if (type == &mp_type_bytes) {
return offset;
}
size_t index_val = 0;
const byte *s = self_data;
for (size_t i = 0; i < offset; i++, s++) {
if (!UTF8_IS_CONT(*s)) {
++index_val;
}
}
return index_val;
}
// Convert an index into a pointer to its lead byte. Out of bounds indexing will raise IndexError or
// be capped to the first/last character of the string, depending on is_slice.
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) {
// All str functions also handle bytes objects, and they call str_index_to_ptr(),
// so it must handle bytes.
if (type == &mp_type_bytes) {
// Taken from objstr.c:str_index_to_ptr()
size_t index_val = mp_get_index(type, self_len, index, is_slice);
return self_data + index_val;
}
mp_int_t i;
// Copied from mp_get_index; I don't want bounds checking, just give me
// the integer as-is. (I can't bounds-check without scanning the whole
// string; an out-of-bounds index will be caught in the loops below.)
if (mp_obj_is_small_int(index)) {
i = MP_OBJ_SMALL_INT_VALUE(index);
} else if (!mp_obj_get_int_maybe(index, &i)) {
mp_raise_TypeError_varg(MP_ERROR_TEXT("%q must be of type %q, not %q"), MP_QSTR_index, MP_QSTR_int, mp_obj_get_type(index)->name);
}
const byte *s, *top = self_data + self_len;
if (i < 0) {
// Negative indexing is performed by counting from the end of the string.
for (s = top - 1; i; --s) {
if (s < self_data) {
if (is_slice) {
return self_data;
}
mp_raise_IndexError_varg(MP_ERROR_TEXT("%q index out of range"), MP_QSTR_str);
}
if (!UTF8_IS_CONT(*s)) {
++i;
}
}
++s;
} else {
// Positive indexing, correspondingly, counts from the start of the string.
// It's assumed that negative indexing will generally be used with small
// absolute values (eg str[-1], not str[-1000000]), which means it'll be
// more efficient this way.
s = self_data;
while (1) {
// First check out-of-bounds
if (s >= top) {
if (is_slice) {
return top;
}
mp_raise_IndexError_varg(MP_ERROR_TEXT("%q index out of range"), MP_QSTR_str);
}
// Then check completion
if (i-- == 0) {
break;
}
// Then skip UTF-8 char
++s;
while (UTF8_IS_CONT(*s)) {
++s;
}
}
}
return s;
}
STATIC mp_obj_t str_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);
assert(type == &mp_type_str);
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_obj_t ostart, ostop, ostep;
mp_obj_slice_t *slice = MP_OBJ_TO_PTR(index);
ostart = slice->start;
ostop = slice->stop;
ostep = slice->step;
if (ostep != mp_const_none && ostep != MP_OBJ_NEW_SMALL_INT(1)) {
mp_raise_NotImplementedError(MP_ERROR_TEXT("only slices with step=1 (aka None) are supported"));
}
const byte *pstart, *pstop;
if (ostart != mp_const_none) {
pstart = str_index_to_ptr(type, self_data, self_len, ostart, true);
} else {
pstart = self_data;
}
if (ostop != mp_const_none) {
// pstop will point just after the stop character. This depends on
// the \0 at the end of the string.
pstop = str_index_to_ptr(type, self_data, self_len, ostop, true);
} else {
pstop = self_data + self_len;
}
if (pstop < pstart) {
return MP_OBJ_NEW_QSTR(MP_QSTR_);
}
return mp_obj_new_str_of_type(type, (const byte *)pstart, pstop - pstart);
}
#endif
const byte *s = str_index_to_ptr(type, self_data, self_len, index, false);
int len = 1;
if (UTF8_IS_NONASCII(*s)) {
// Count the number of 1 bits (after the first)
for (char mask = 0x40; *s & mask; mask >>= 1) {
++len;
}
}
return mp_obj_new_str_via_qstr((const char *)s, len); // This will create a one-character string
} else {
return MP_OBJ_NULL; // op not supported
}
}
STATIC const mp_rom_map_elem_t struni_locals_dict_table[] = {
#if MICROPY_CPYTHON_COMPAT
{ MP_ROM_QSTR(MP_QSTR_encode), MP_ROM_PTR(&str_encode_obj) },
#endif
{ MP_ROM_QSTR(MP_QSTR_find), MP_ROM_PTR(&str_find_obj) },
{ MP_ROM_QSTR(MP_QSTR_rfind), MP_ROM_PTR(&str_rfind_obj) },
{ MP_ROM_QSTR(MP_QSTR_index), MP_ROM_PTR(&str_index_obj) },
{ MP_ROM_QSTR(MP_QSTR_rindex), MP_ROM_PTR(&str_rindex_obj) },
{ MP_ROM_QSTR(MP_QSTR_join), MP_ROM_PTR(&str_join_obj) },
{ MP_ROM_QSTR(MP_QSTR_split), MP_ROM_PTR(&str_split_obj) },
#if MICROPY_PY_BUILTINS_STR_SPLITLINES
{ MP_ROM_QSTR(MP_QSTR_splitlines), MP_ROM_PTR(&str_splitlines_obj) },
#endif
{ MP_ROM_QSTR(MP_QSTR_rsplit), MP_ROM_PTR(&str_rsplit_obj) },
{ MP_ROM_QSTR(MP_QSTR_startswith), MP_ROM_PTR(&str_startswith_obj) },
{ MP_ROM_QSTR(MP_QSTR_endswith), MP_ROM_PTR(&str_endswith_obj) },
{ MP_ROM_QSTR(MP_QSTR_strip), MP_ROM_PTR(&str_strip_obj) },
{ MP_ROM_QSTR(MP_QSTR_lstrip), MP_ROM_PTR(&str_lstrip_obj) },
{ MP_ROM_QSTR(MP_QSTR_rstrip), MP_ROM_PTR(&str_rstrip_obj) },
{ MP_ROM_QSTR(MP_QSTR_format), MP_ROM_PTR(&str_format_obj) },
{ MP_ROM_QSTR(MP_QSTR_replace), MP_ROM_PTR(&str_replace_obj) },
#if MICROPY_PY_BUILTINS_STR_COUNT
{ MP_ROM_QSTR(MP_QSTR_count), MP_ROM_PTR(&str_count_obj) },
#endif
#if MICROPY_PY_BUILTINS_STR_PARTITION
{ MP_ROM_QSTR(MP_QSTR_partition), MP_ROM_PTR(&str_partition_obj) },
{ MP_ROM_QSTR(MP_QSTR_rpartition), MP_ROM_PTR(&str_rpartition_obj) },
#endif
#if MICROPY_PY_BUILTINS_STR_CENTER
{ MP_ROM_QSTR(MP_QSTR_center), MP_ROM_PTR(&str_center_obj) },
#endif
{ MP_ROM_QSTR(MP_QSTR_lower), MP_ROM_PTR(&str_lower_obj) },
{ MP_ROM_QSTR(MP_QSTR_upper), MP_ROM_PTR(&str_upper_obj) },
{ MP_ROM_QSTR(MP_QSTR_isspace), MP_ROM_PTR(&str_isspace_obj) },
{ MP_ROM_QSTR(MP_QSTR_isalpha), MP_ROM_PTR(&str_isalpha_obj) },
{ MP_ROM_QSTR(MP_QSTR_isdigit), MP_ROM_PTR(&str_isdigit_obj) },
{ MP_ROM_QSTR(MP_QSTR_isupper), MP_ROM_PTR(&str_isupper_obj) },
{ MP_ROM_QSTR(MP_QSTR_islower), MP_ROM_PTR(&str_islower_obj) },
};
STATIC MP_DEFINE_CONST_DICT(struni_locals_dict, struni_locals_dict_table);
const mp_obj_type_t mp_type_str = {
{ &mp_type_type },
.flags = MP_TYPE_FLAG_EXTENDED,
.name = MP_QSTR_str,
.print = uni_print,
.make_new = mp_obj_str_make_new,
.locals_dict = (mp_obj_dict_t *)&struni_locals_dict,
MP_TYPE_EXTENDED_FIELDS(
.unary_op = uni_unary_op,
.binary_op = mp_obj_str_binary_op,
.subscr = str_subscr,
.getiter = mp_obj_new_str_iterator,
.buffer_p = { .get_buffer = mp_obj_str_get_buffer },
),
};
/******************************************************************************/
/* str iterator */
typedef struct _mp_obj_str_it_t {
mp_obj_base_t base;
mp_fun_1_t iternext;
mp_obj_t str;
size_t cur;
} mp_obj_str_it_t;
STATIC mp_obj_t str_it_iternext(mp_obj_t self_in) {
mp_obj_str_it_t *self = MP_OBJ_TO_PTR(self_in);
GET_STR_DATA_LEN(self->str, str, len);
if (self->cur < len) {
const byte *cur = str + self->cur;
const byte *end = utf8_next_char(str + self->cur);
mp_obj_t o_out = mp_obj_new_str_via_qstr((const char *)cur, end - cur);
self->cur += end - cur;
return o_out;
} else {
return MP_OBJ_STOP_ITERATION;
}
}
STATIC mp_obj_t mp_obj_new_str_iterator(mp_obj_t str, mp_obj_iter_buf_t *iter_buf) {
assert(sizeof(mp_obj_str_it_t) <= sizeof(mp_obj_iter_buf_t));
mp_obj_str_it_t *o = (mp_obj_str_it_t *)iter_buf;
o->base.type = &mp_type_polymorph_iter;
o->iternext = str_it_iternext;
o->str = str;
o->cur = 0;
return MP_OBJ_FROM_PTR(o);
}
#endif // MICROPY_PY_BUILTINS_STR_UNICODE
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