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circuitpython/py/objstrunicode.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
* Copyright (c) 2014 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 <stdbool.h>
#include <string.h>
#include <assert.h>
#include "mpconfig.h"
#include "nlr.h"
#include "misc.h"
#include "qstr.h"
#include "obj.h"
#include "runtime0.h"
#include "runtime.h"
#include "pfenv.h"
#include "objstr.h"
#include "objlist.h"
#if MICROPY_PY_BUILTINS_STR_UNICODE
STATIC mp_obj_t mp_obj_new_str_iterator(mp_obj_t str);
/******************************************************************************/
/* str */
STATIC void uni_print_quoted(void (*print)(void *env, const char *fmt, ...), void *env, 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;
}
}
int quote_char = '\'';
if (has_single_quote && !has_double_quote) {
quote_char = '"';
}
print(env, "%c", quote_char);
const byte *s = str_data, *top = str_data + str_len;
while (s < top) {
unichar ch;
ch = utf8_get_char(s);
s = utf8_next_char(s);
if (ch == quote_char) {
print(env, "\\%c", quote_char);
} else if (ch == '\\') {
print(env, "\\\\");
} else if (32 <= ch && ch <= 126) {
print(env, "%c", ch);
} else if (ch == '\n') {
print(env, "\\n");
} else if (ch == '\r') {
print(env, "\\r");
} else if (ch == '\t') {
print(env, "\\t");
} else if (ch < 0x100) {
print(env, "\\x%02x", ch);
} else if (ch < 0x10000) {
print(env, "\\u%04x", ch);
} else {
print(env, "\\U%08x", ch);
}
}
print(env, "%c", quote_char);
}
STATIC void uni_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
GET_STR_DATA_LEN(self_in, str_data, str_len);
if (kind == PRINT_STR) {
print(env, "%.*s", str_len, str_data);
} else {
uni_print_quoted(print, env, str_data, str_len);
}
}
STATIC mp_obj_t uni_unary_op(int 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_BOOL(str_len != 0);
case MP_UNARY_OP_LEN:
return MP_OBJ_NEW_SMALL_INT(unichar_charlen((const char *)str_data, str_len));
default:
return MP_OBJ_NULL; // op not supported
}
}
STATIC mp_obj_t str_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
#if MICROPY_CPYTHON_COMPAT
if (n_kw != 0) {
mp_arg_error_unimpl_kw();
}
#endif
switch (n_args) {
case 0:
return MP_OBJ_NEW_QSTR(MP_QSTR_);
case 1:
{
vstr_t *vstr = vstr_new();
mp_obj_print_helper((void (*)(void*, const char*, ...))vstr_printf, vstr, args[0], PRINT_STR);
mp_obj_t s = mp_obj_new_str(vstr->buf, vstr->len, false);
vstr_free(vstr);
return s;
}
case 2:
case 3:
{
// TODO: validate 2nd/3rd args
if (!MP_OBJ_IS_TYPE(args[0], &mp_type_bytes)) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "bytes expected"));
}
GET_STR_DATA_LEN(args[0], str_data, str_len);
GET_STR_HASH(args[0], str_hash);
mp_obj_str_t *o = mp_obj_new_str_of_type(&mp_type_str, NULL, str_len);
o->data = str_data;
o->hash = str_hash;
return o;
}
default:
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "str takes at most 3 arguments"));
}
}
// 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, uint self_len,
mp_obj_t index, bool is_slice) {
machine_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)) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "string indices must be integers, not %s", mp_obj_get_type_str(index)));
}
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;
}
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_IndexError, "string index out of range"));
}
if (!UTF8_IS_CONT(*s)) {
++i;
}
}
++s;
} else if (!i) {
return self_data; // Shortcut - str[0] is its base pointer
} 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.
for (s = self_data; true; ++s) {
if (s >= top) {
if (is_slice) {
return top;
}
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_IndexError, "string index out of range"));
}
while (UTF8_IS_CONT(*s)) {
++s;
}
if (!i--) {
return s;
}
}
}
return s;
}
STATIC mp_obj_t str_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
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_obj_t ostart, ostop, ostep;
mp_obj_slice_get(index, &ostart, &ostop, &ostep);
if (ostep != mp_const_none && ostep != MP_OBJ_NEW_SMALL_INT(1)) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_NotImplementedError,
"only slices with step=1 (aka None) are supported"));
}
if (type == &mp_type_bytes) {
machine_int_t start = 0, stop = self_len;
if (ostart != mp_const_none) {
start = MP_OBJ_SMALL_INT_VALUE(ostart);
if (start < 0) {
start = self_len + start;
}
}
if (ostop != mp_const_none) {
stop = MP_OBJ_SMALL_INT_VALUE(ostop);
if (stop < 0) {
stop = self_len + stop;
}
}
return mp_obj_new_str_of_type(type, self_data + start, stop - start);
}
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
if (type == &mp_type_bytes) {
uint index_val = mp_get_index(type, self_len, index, false);
return MP_OBJ_NEW_SMALL_INT((mp_small_int_t)self_data[index_val]);
}
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((const char*)s, len, true); // This will create a one-character string
} else {
return MP_OBJ_NULL; // op not supported
}
}
STATIC const mp_map_elem_t str_locals_dict_table[] = {
#if MICROPY_CPYTHON_COMPAT
{ MP_OBJ_NEW_QSTR(MP_QSTR_encode), (mp_obj_t)&str_encode_obj },
#endif
{ MP_OBJ_NEW_QSTR(MP_QSTR_find), (mp_obj_t)&str_find_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_rfind), (mp_obj_t)&str_rfind_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_index), (mp_obj_t)&str_index_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_rindex), (mp_obj_t)&str_rindex_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_join), (mp_obj_t)&str_join_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_split), (mp_obj_t)&str_split_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_rsplit), (mp_obj_t)&str_rsplit_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_startswith), (mp_obj_t)&str_startswith_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_endswith), (mp_obj_t)&str_endswith_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_strip), (mp_obj_t)&str_strip_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_lstrip), (mp_obj_t)&str_lstrip_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_rstrip), (mp_obj_t)&str_rstrip_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_format), (mp_obj_t)&str_format_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_replace), (mp_obj_t)&str_replace_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_count), (mp_obj_t)&str_count_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_partition), (mp_obj_t)&str_partition_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_rpartition), (mp_obj_t)&str_rpartition_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_lower), (mp_obj_t)&str_lower_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_upper), (mp_obj_t)&str_upper_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_isspace), (mp_obj_t)&str_isspace_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_isalpha), (mp_obj_t)&str_isalpha_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_isdigit), (mp_obj_t)&str_isdigit_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_isupper), (mp_obj_t)&str_isupper_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_islower), (mp_obj_t)&str_islower_obj },
};
STATIC MP_DEFINE_CONST_DICT(str_locals_dict, str_locals_dict_table);
const mp_obj_type_t mp_type_str = {
{ &mp_type_type },
.name = MP_QSTR_str,
.print = uni_print,
.make_new = str_make_new,
.unary_op = uni_unary_op,
.binary_op = str_binary_op,
.subscr = str_subscr,
.getiter = mp_obj_new_str_iterator,
.buffer_p = { .get_buffer = str_get_buffer },
.locals_dict = (mp_obj_t)&str_locals_dict,
};
/******************************************************************************/
/* str iterator */
typedef struct _mp_obj_str_it_t {
mp_obj_base_t base;
mp_obj_t str;
machine_uint_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 = 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((const char*)cur, end - cur, true);
self->cur += end - cur;
return o_out;
} else {
return MP_OBJ_STOP_ITERATION;
}
}
STATIC const mp_obj_type_t mp_type_str_it = {
{ &mp_type_type },
.name = MP_QSTR_iterator,
.getiter = mp_identity,
.iternext = str_it_iternext,
};
mp_obj_t mp_obj_new_str_iterator(mp_obj_t str) {
mp_obj_str_it_t *o = m_new_obj(mp_obj_str_it_t);
o->base.type = &mp_type_str_it;
o->str = str;
o->cur = 0;
return o;
}
#endif // MICROPY_PY_BUILTINS_STR_UNICODE
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