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micropython/py/objstr.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 <string.h>
#include <assert.h>
#include "py/nlr.h"
#include "py/unicode.h"
#include "py/objstr.h"
#include "py/objlist.h"
#include "py/runtime0.h"
#include "py/runtime.h"
#include "py/pfenv.h"
STATIC mp_obj_t str_modulo_format(mp_obj_t pattern, mp_uint_t n_args, const mp_obj_t *args, mp_obj_t dict);
mp_obj_t mp_obj_new_str_iterator(mp_obj_t str);
STATIC mp_obj_t mp_obj_new_bytes_iterator(mp_obj_t str);
STATIC NORETURN void bad_implicit_conversion(mp_obj_t self_in);
/******************************************************************************/
/* str */
void mp_str_print_quoted(void (*print)(void *env, const char *fmt, ...), void *env,
const byte *str_data, mp_uint_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 = '"';
}
print(env, "%c", quote_char);
for (const byte *s = str_data, *top = str_data + str_len; s < top; s++) {
if (*s == quote_char) {
print(env, "\\%c", quote_char);
} else if (*s == '\\') {
print(env, "\\\\");
} 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.)
print(env, "%c", *s);
} else if (*s == '\n') {
print(env, "\\n");
} else if (*s == '\r') {
print(env, "\\r");
} else if (*s == '\t') {
print(env, "\\t");
} else {
print(env, "\\x%02x", *s);
}
}
print(env, "%c", quote_char);
}
#if MICROPY_PY_UJSON
void mp_str_print_json(void (*print)(void *env, const char *fmt, ...), void *env, const byte *str_data, mp_uint_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
print(env, "\"");
for (const byte *s = str_data, *top = str_data + str_len; s < top; s++) {
if (*s == '"' || *s == '\\') {
print(env, "\\%c", *s);
} else if (*s >= 32) {
// this will handle normal and utf-8 encoded chars
print(env, "%c", *s);
} else if (*s == '\n') {
print(env, "\\n");
} else if (*s == '\r') {
print(env, "\\r");
} else if (*s == '\t') {
print(env, "\\t");
} else {
// this will handle control chars
print(env, "\\u%04x", *s);
}
}
print(env, "\"");
}
#endif
STATIC void str_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 MICROPY_PY_UJSON
if (kind == PRINT_JSON) {
mp_str_print_json(print, env, str_data, str_len);
return;
}
#endif
bool is_bytes = MP_OBJ_IS_TYPE(self_in, &mp_type_bytes);
if (kind == PRINT_STR && !is_bytes) {
print(env, "%.*s", str_len, str_data);
} else {
if (is_bytes) {
print(env, "b");
}
mp_str_print_quoted(print, env, str_data, str_len, is_bytes);
}
}
#if !MICROPY_PY_BUILTINS_STR_UNICODE || MICROPY_CPYTHON_COMPAT
STATIC mp_obj_t str_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_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 = 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;
}
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);
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;
} else {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);
return mp_obj_new_str(bufinfo.buf, bufinfo.len, false);
}
}
}
#endif
STATIC mp_obj_t bytes_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
if (n_args == 0) {
return mp_const_empty_bytes;
}
#if MICROPY_CPYTHON_COMPAT
if (n_kw != 0) {
mp_arg_error_unimpl_kw();
}
#endif
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 = mp_obj_new_str_of_type(&mp_type_bytes, 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(&mp_type_bytes, len, &data);
memset(data, 0, len);
return mp_obj_str_builder_end(o);
}
// 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_str_of_type(&mp_type_bytes, bufinfo.buf, bufinfo.len);
}
mp_int_t len;
byte *data;
vstr_t *vstr = NULL;
mp_obj_t o = MP_OBJ_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(&mp_type_bytes, len, &data);
}
mp_obj_t iterable = mp_getiter(args[0]);
mp_obj_t item;
while ((item = mp_iternext(iterable)) != MP_OBJ_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(&mp_type_bytes, len, &data);
memcpy(data, vstr_str(vstr), len);
vstr_free(vstr);
}
return mp_obj_str_builder_end(o);
wrong_args:
nlr_raise(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, mp_uint_t hlen, const byte *needle, mp_uint_t nlen, mp_int_t direction) {
if (hlen >= nlen) {
mp_uint_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_uint_t op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
// check for modulo
if (op == MP_BINARY_OP_MODULO) {
mp_obj_t *args;
mp_uint_t n_args;
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)) {
args = NULL;
n_args = 0;
dict = rhs_in;
} else {
args = &rhs_in;
n_args = 1;
}
return str_modulo_format(lhs_in, n_args, args, dict);
}
// from now on we need lhs type and data, so extract them
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;
}
}
byte *data;
mp_obj_t s = mp_obj_str_builder_start(lhs_type, lhs_len * n, &data);
mp_seq_multiply(lhs_data, sizeof(*lhs_data), lhs_len, n, data);
return mp_obj_str_builder_end(s);
}
// 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;
mp_uint_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 {
// incompatible types
return MP_OBJ_NULL; // op not supported
}
switch (op) {
case MP_BINARY_OP_ADD:
case MP_BINARY_OP_INPLACE_ADD: {
mp_uint_t alloc_len = lhs_len + rhs_len;
byte *data;
mp_obj_t s = mp_obj_str_builder_start(lhs_type, alloc_len, &data);
memcpy(data, lhs_data, lhs_len);
memcpy(data + lhs_len, rhs_data, rhs_len);
return mp_obj_str_builder_end(s);
}
case MP_BINARY_OP_IN:
/* NOTE `a in b` is `b.__contains__(a)` */
return MP_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_BOOL(mp_seq_cmp_bytes(op, lhs_data, lhs_len, rhs_data, rhs_len));
}
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, mp_uint_t self_len,
mp_obj_t index, bool is_slice) {
mp_uint_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) {
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)) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_NotImplementedError,
"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
mp_uint_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((char*)&self_data[index_val], 1, true);
}
} else {
return MP_OBJ_NULL; // op not supported
}
}
STATIC mp_obj_t str_join(mp_obj_t self_in, mp_obj_t arg) {
assert(MP_OBJ_IS_STR_OR_BYTES(self_in));
const mp_obj_type_t *self_type = mp_obj_get_type(self_in);
// get separation string
GET_STR_DATA_LEN(self_in, sep_str, sep_len);
// process args
mp_uint_t seq_len;
mp_obj_t *seq_items;
if (MP_OBJ_IS_TYPE(arg, &mp_type_tuple)) {
mp_obj_tuple_get(arg, &seq_len, &seq_items);
} else {
if (!MP_OBJ_IS_TYPE(arg, &mp_type_list)) {
// arg is not a list, try to convert it to one
// TODO: Try to optimize?
arg = mp_type_list.make_new((mp_obj_t)&mp_type_list, 1, 0, &arg);
}
mp_obj_list_get(arg, &seq_len, &seq_items);
}
// count required length
mp_uint_t required_len = 0;
for (mp_uint_t i = 0; i < seq_len; i++) {
if (mp_obj_get_type(seq_items[i]) != self_type) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
"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
byte *data;
mp_obj_t joined_str = mp_obj_str_builder_start(self_type, required_len, &data);
for (mp_uint_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_str_builder_end(joined_str);
}
#define is_ws(c) ((c) == ' ' || (c) == '\t')
STATIC mp_obj_t str_split(mp_uint_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 && is_ws(*s)) s++;
while (s < top && splits != 0) {
const byte *start = s;
while (s < top && !is_ws(*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 && is_ws(*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
if (mp_obj_get_type(sep) != self_type) {
bad_implicit_conversion(sep);
}
mp_uint_t sep_len;
const char *sep_str = mp_obj_str_get_data(sep, &sep_len);
if (sep_len == 0) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "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;
}
STATIC mp_obj_t str_rsplit(mp_uint_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 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]);
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_new_list(splits + 1, NULL);
mp_int_t idx = splits;
if (sep == mp_const_none) {
assert(!"TODO: rsplit(None,n) not implemented");
} else {
mp_uint_t sep_len;
const char *sep_str = mp_obj_str_get_data(sep, &sep_len);
if (sep_len == 0) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "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;
if (splits > 0) {
splits--;
}
}
if (idx != 0) {
// We split less parts than split limit, now go cleanup surplus
mp_int_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 res;
}
STATIC mp_obj_t str_finder(mp_uint_t n_args, const mp_obj_t *args, mp_int_t direction, bool is_index) {
const mp_obj_type_t *self_type = mp_obj_get_type(args[0]);
assert(2 <= n_args && n_args <= 4);
assert(MP_OBJ_IS_STR_OR_BYTES(args[0]));
// check argument type
if (mp_obj_get_type(args[1]) != self_type) {
bad_implicit_conversion(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);
}
const byte *p = find_subbytes(start, end - start, needle, needle_len, direction);
if (p == NULL) {
// not found
if (is_index) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "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(mp_uint_t n_args, const mp_obj_t *args) {
return str_finder(n_args, args, 1, false);
}
STATIC mp_obj_t str_rfind(mp_uint_t n_args, const mp_obj_t *args) {
return str_finder(n_args, args, -1, false);
}
STATIC mp_obj_t str_index(mp_uint_t n_args, const mp_obj_t *args) {
return str_finder(n_args, args, 1, true);
}
STATIC mp_obj_t str_rindex(mp_uint_t n_args, const mp_obj_t *args) {
return str_finder(n_args, args, -1, true);
}
// TODO: (Much) more variety in args
STATIC mp_obj_t str_startswith(mp_uint_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);
GET_STR_DATA_LEN(args[1], prefix, 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_BOOL(memcmp(start, prefix, prefix_len) == 0);
}
STATIC mp_obj_t str_endswith(mp_uint_t n_args, const mp_obj_t *args) {
GET_STR_DATA_LEN(args[0], str, str_len);
GET_STR_DATA_LEN(args[1], suffix, suffix_len);
assert(n_args == 2);
if (suffix_len > str_len) {
return mp_const_false;
}
return MP_BOOL(memcmp(str + (str_len - suffix_len), suffix, suffix_len) == 0);
}
enum { LSTRIP, RSTRIP, STRIP };
STATIC mp_obj_t str_uni_strip(int type, mp_uint_t n_args, const mp_obj_t *args) {
assert(1 <= n_args && n_args <= 2);
assert(MP_OBJ_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);
} else {
if (mp_obj_get_type(args[1]) != self_type) {
bad_implicit_conversion(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);
mp_uint_t first_good_char_pos = 0;
bool first_good_char_pos_set = false;
mp_uint_t last_good_char_pos = 0;
mp_uint_t i = 0;
mp_int_t delta = 1;
if (type == RSTRIP) {
i = orig_str_len - 1;
delta = -1;
}
for (mp_uint_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 accomodate the last character
mp_uint_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(mp_uint_t n_args, const mp_obj_t *args) {
return str_uni_strip(STRIP, n_args, args);
}
STATIC mp_obj_t str_lstrip(mp_uint_t n_args, const mp_obj_t *args) {
return str_uni_strip(LSTRIP, n_args, args);
}
STATIC mp_obj_t str_rstrip(mp_uint_t n_args, const mp_obj_t *args) {
return str_uni_strip(RSTRIP, n_args, args);
}
// Takes an int arg, but only parses unsigned numbers, and only changes
// *num if at least one digit was parsed.
static int str_to_int(const char *str, int *num) {
const char *s = str;
if ('0' <= *s && *s <= '9') {
*num = 0;
do {
*num = *num * 10 + (*s - '0');
s++;
}
while ('0' <= *s && *s <= '9');
}
return s - 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_TYPE(arg, &mp_type_bool) || 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_TYPE(arg, &mp_type_float)
#endif
;
}
static mp_obj_t arg_as_int(mp_obj_t arg) {
#if MICROPY_PY_BUILTINS_FLOAT
if (MP_OBJ_IS_TYPE(arg, &mp_type_float)) {
return mp_obj_new_int_from_float(mp_obj_get_float(arg));
}
#endif
return arg;
}
STATIC NORETURN void terse_str_format_value_error(void) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "bad format string"));
}
mp_obj_t mp_obj_str_format(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
assert(MP_OBJ_IS_STR_OR_BYTES(args[0]));
GET_STR_DATA_LEN(args[0], str, len);
int arg_i = 0;
vstr_t *vstr = vstr_new();
pfenv_t pfenv_vstr;
pfenv_vstr.data = vstr;
pfenv_vstr.print_strn = pfenv_vstr_add_strn;
for (const byte *top = str + len; str < top; str++) {
if (*str == '}') {
str++;
if (str < top && *str == '}') {
vstr_add_char(vstr, '}');
continue;
}
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"single '}' encountered in format string"));
}
}
if (*str != '{') {
vstr_add_char(vstr, *str);
continue;
}
str++;
if (str < top && *str == '{') {
vstr_add_char(vstr, '{');
continue;
}
// replacement_field ::= "{" [field_name] ["!" conversion] [":" format_spec] "}"
vstr_t *field_name = NULL;
char conversion = '\0';
vstr_t *format_spec = NULL;
if (str < top && *str != '}' && *str != '!' && *str != ':') {
field_name = vstr_new();
while (str < top && *str != '}' && *str != '!' && *str != ':') {
vstr_add_char(field_name, *str++);
}
vstr_add_char(field_name, '\0');
}
// conversion ::= "r" | "s"
if (str < top && *str == '!') {
str++;
if (str < top && (*str == 'r' || *str == 's')) {
conversion = *str++;
} else {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"end of format while looking for conversion specifier"));
}
}
}
if (str < top && *str == ':') {
str++;
// {:} is the same as {}, which is the same as {!s}
// This makes a difference when passing in a True or False
// '{}'.format(True) returns 'True'
// '{:d}'.format(True) returns '1'
// So we treat {:} as {} and this later gets treated to be {!s}
if (*str != '}') {
format_spec = vstr_new();
while (str < top && *str != '}') {
vstr_add_char(format_spec, *str++);
}
vstr_add_char(format_spec, '\0');
}
}
if (str >= top) {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"unmatched '{' in format"));
}
}
if (*str != '}') {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"expected ':' after format specifier"));
}
}
mp_obj_t arg = mp_const_none;
if (field_name) {
int index = 0;
const char *field = vstr_str(field_name);
const char *lookup = NULL;
if (MP_LIKELY(unichar_isdigit(*field))) {
if (arg_i > 0) {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"can't switch from automatic field numbering to manual field specification"));
}
}
lookup = str_to_int(field, &index) + field;
if ((uint)index >= n_args - 1) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_IndexError, "tuple index out of range"));
}
arg = args[index + 1];
arg_i = -1;
} else {
for (lookup = field; *lookup && *lookup != '.' && *lookup != '['; lookup++);
mp_obj_t field_q = mp_obj_new_str(field, lookup - field, true/*?*/);
mp_map_elem_t *key_elem = mp_map_lookup(kwargs, field_q, MP_MAP_LOOKUP);
if (key_elem == NULL) {
nlr_raise(mp_obj_new_exception_arg1(&mp_type_KeyError, field_q));
}
arg = key_elem->value;
}
if (*lookup) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_NotImplementedError, "attributes not supported yet"));
}
vstr_free(field_name);
field_name = NULL;
} else {
if (arg_i < 0) {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"can't switch from manual field specification to automatic field numbering"));
}
}
if ((uint)arg_i >= n_args - 1) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_IndexError, "tuple index out of range"));
}
arg = args[arg_i + 1];
arg_i++;
}
if (!format_spec && !conversion) {
conversion = 's';
}
if (conversion) {
mp_print_kind_t print_kind;
if (conversion == 's') {
print_kind = PRINT_STR;
} else if (conversion == 'r') {
print_kind = PRINT_REPR;
} else {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
"unknown conversion specifier %c", conversion));
}
}
vstr_t *arg_vstr = vstr_new();
mp_obj_print_helper((void (*)(void*, const char*, ...))vstr_printf, arg_vstr, arg, print_kind);
arg = mp_obj_new_str(vstr_str(arg_vstr), vstr_len(arg_vstr), false);
vstr_free(arg_vstr);
}
char sign = '\0';
char fill = '\0';
char align = '\0';
int width = -1;
int precision = -1;
char type = '\0';
int flags = 0;
if (format_spec) {
// The format specifier (from http://docs.python.org/2/library/string.html#formatspec)
//
// [[fill]align][sign][#][0][width][,][.precision][type]
// fill ::= <any character>
// align ::= "<" | ">" | "=" | "^"
// sign ::= "+" | "-" | " "
// width ::= integer
// precision ::= integer
// type ::= "b" | "c" | "d" | "e" | "E" | "f" | "F" | "g" | "G" | "n" | "o" | "s" | "x" | "X" | "%"
const char *s = vstr_str(format_spec);
if (isalignment(*s)) {
align = *s++;
} else if (*s && isalignment(s[1])) {
fill = *s++;
align = *s++;
}
if (*s == '+' || *s == '-' || *s == ' ') {
if (*s == '+') {
flags |= PF_FLAG_SHOW_SIGN;
} else if (*s == ' ') {
flags |= PF_FLAG_SPACE_SIGN;
}
sign = *s++;
}
if (*s == '#') {
flags |= PF_FLAG_SHOW_PREFIX;
s++;
}
if (*s == '0') {
if (!align) {
align = '=';
}
if (!fill) {
fill = '0';
}
}
s += str_to_int(s, &width);
if (*s == ',') {
flags |= PF_FLAG_SHOW_COMMA;
s++;
}
if (*s == '.') {
s++;
s += str_to_int(s, &precision);
}
if (istype(*s)) {
type = *s++;
}
if (*s) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_KeyError, "Invalid conversion specification"));
}
vstr_free(format_spec);
format_spec = NULL;
}
if (!align) {
if (arg_looks_numeric(arg)) {
align = '>';
} else {
align = '<';
}
}
if (!fill) {
fill = ' ';
}
if (sign) {
if (type == 's') {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"sign not allowed in string format specifier"));
}
}
if (type == 'c') {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"sign not allowed with integer format specifier 'c'"));
}
}
} else {
sign = '-';
}
switch (align) {
case '<': flags |= PF_FLAG_LEFT_ADJUST; break;
case '=': flags |= PF_FLAG_PAD_AFTER_SIGN; break;
case '^': flags |= PF_FLAG_CENTER_ADJUST; break;
}
if (arg_looks_integer(arg)) {
switch (type) {
case 'b':
pfenv_print_mp_int(&pfenv_vstr, arg, 1, 2, 'a', flags, fill, width, 0);
continue;
case 'c':
{
char ch = mp_obj_get_int(arg);
pfenv_print_strn(&pfenv_vstr, &ch, 1, flags, fill, width);
continue;
}
case '\0': // No explicit format type implies 'd'
case 'n': // I don't think we support locales in uPy so use 'd'
case 'd':
pfenv_print_mp_int(&pfenv_vstr, arg, 1, 10, 'a', flags, fill, width, 0);
continue;
case 'o':
if (flags & PF_FLAG_SHOW_PREFIX) {
flags |= PF_FLAG_SHOW_OCTAL_LETTER;
}
pfenv_print_mp_int(&pfenv_vstr, arg, 1, 8, 'a', flags, fill, width, 0);
continue;
case 'X':
case 'x':
pfenv_print_mp_int(&pfenv_vstr, arg, 1, 16, type - ('X' - 'A'), flags, fill, width, 0);
continue;
case 'e':
case 'E':
case 'f':
case 'F':
case 'g':
case 'G':
case '%':
// The floating point formatters all work with anything that
// looks like an integer
break;
default:
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
"unknown format code '%c' for object of type '%s'",
type, mp_obj_get_type_str(arg)));
}
}
}
// NOTE: no else here. We need the e, f, g etc formats for integer
// arguments (from above if) to take this if.
if (arg_looks_numeric(arg)) {
if (!type) {
// Even though the docs say that an unspecified type is the same
// as 'g', there is one subtle difference, when the exponent
// is one less than the precision.
//
// '{:10.1}'.format(0.0) ==> '0e+00'
// '{:10.1g}'.format(0.0) ==> '0'
//
// TODO: Figure out how to deal with this.
//
// A proper solution would involve adding a special flag
// or something to format_float, and create a format_double
// to deal with doubles. In order to fix this when using
// sprintf, we'd need to use the e format and tweak the
// returned result to strip trailing zeros like the g format
// does.
//
// {:10.3} and {:10.2e} with 1.23e2 both produce 1.23e+02
// but with 1.e2 you get 1e+02 and 1.00e+02
//
// Stripping the trailing 0's (like g) does would make the
// e format give us the right format.
//
// CPython sources say:
// Omitted type specifier. Behaves in the same way as repr(x)
// and str(x) if no precision is given, else like 'g', but with
// at least one digit after the decimal point. */
type = 'g';
}
if (type == 'n') {
type = 'g';
}
flags |= PF_FLAG_PAD_NAN_INF; // '{:06e}'.format(float('-inf')) should give '-00inf'
switch (type) {
#if MICROPY_PY_BUILTINS_FLOAT
case 'e':
case 'E':
case 'f':
case 'F':
case 'g':
case 'G':
pfenv_print_float(&pfenv_vstr, mp_obj_get_float(arg), type, flags, fill, width, precision);
break;
case '%':
flags |= PF_FLAG_ADD_PERCENT;
#if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT
#define F100 100.0F
#else
#define F100 100.0
#endif
pfenv_print_float(&pfenv_vstr, mp_obj_get_float(arg) * F100, 'f', flags, fill, width, precision);
#undef F100
break;
#endif
default:
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
"unknown format code '%c' for object of type 'float'",
type, mp_obj_get_type_str(arg)));
}
}
} else {
// arg doesn't look like a number
if (align == '=') {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"'=' alignment not allowed in string format specifier"));
}
}
switch (type) {
case '\0':
mp_obj_print_helper((void (*)(void*, const char*, ...))vstr_printf, vstr, arg, PRINT_STR);
break;
case 's': {
mp_uint_t slen;
const char *s = mp_obj_str_get_data(arg, &slen);
if (precision < 0) {
precision = slen;
}
if (slen > (mp_uint_t)precision) {
slen = precision;
}
pfenv_print_strn(&pfenv_vstr, s, slen, flags, fill, width);
break;
}
default:
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
"unknown format code '%c' for object of type 'str'",
type, mp_obj_get_type_str(arg)));
}
}
}
}
mp_obj_t s = mp_obj_new_str(vstr->buf, vstr->len, false);
vstr_free(vstr);
return s;
}
STATIC mp_obj_t str_modulo_format(mp_obj_t pattern, mp_uint_t n_args, const mp_obj_t *args, mp_obj_t dict) {
assert(MP_OBJ_IS_STR_OR_BYTES(pattern));
GET_STR_DATA_LEN(pattern, str, len);
const byte *start_str = str;
int arg_i = 0;
vstr_t *vstr = vstr_new();
pfenv_t pfenv_vstr;
pfenv_vstr.data = vstr;
pfenv_vstr.print_strn = pfenv_vstr_add_strn;
for (const byte *top = str + len; str < top; str++) {
mp_obj_t arg = MP_OBJ_NULL;
if (*str != '%') {
vstr_add_char(vstr, *str);
continue;
}
if (++str >= top) {
break;
}
if (*str == '%') {
vstr_add_char(vstr, '%');
continue;
}
// Dictionary value lookup
if (*str == '(') {
const byte *key = ++str;
while (*str != ')') {
if (str >= top) {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"incomplete format key"));
}
}
++str;
}
mp_obj_t k_obj = mp_obj_new_str((const char*)key, str - key, true);
arg = mp_obj_dict_get(dict, k_obj);
str++;
}
int flags = 0;
char fill = ' ';
int alt = 0;
while (str < top) {
if (*str == '-') flags |= PF_FLAG_LEFT_ADJUST;
else if (*str == '+') flags |= PF_FLAG_SHOW_SIGN;
else if (*str == ' ') flags |= PF_FLAG_SPACE_SIGN;
else if (*str == '#') alt = PF_FLAG_SHOW_PREFIX;
else if (*str == '0') {
flags |= PF_FLAG_PAD_AFTER_SIGN;
fill = '0';
} else break;
str++;
}
// parse width, if it exists
int width = 0;
if (str < top) {
if (*str == '*') {
if ((uint)arg_i >= n_args) {
goto not_enough_args;
}
width = mp_obj_get_int(args[arg_i++]);
str++;
} else {
str += str_to_int((const char*)str, &width);
}
}
int prec = -1;
if (str < top && *str == '.') {
if (++str < top) {
if (*str == '*') {
if ((uint)arg_i >= n_args) {
goto not_enough_args;
}
prec = mp_obj_get_int(args[arg_i++]);
str++;
} else {
prec = 0;
str += str_to_int((const char*)str, &prec);
}
}
}
if (str >= top) {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"incomplete format"));
}
}
// Tuple value lookup
if (arg == MP_OBJ_NULL) {
if ((uint)arg_i >= n_args) {
not_enough_args:
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "not enough arguments for format string"));
}
arg = args[arg_i++];
}
switch (*str) {
case 'c':
if (MP_OBJ_IS_STR(arg)) {
mp_uint_t slen;
const char *s = mp_obj_str_get_data(arg, &slen);
if (slen != 1) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
"%%c requires int or char"));
}
pfenv_print_strn(&pfenv_vstr, s, 1, flags, ' ', width);
} else if (arg_looks_integer(arg)) {
char ch = mp_obj_get_int(arg);
pfenv_print_strn(&pfenv_vstr, &ch, 1, flags, ' ', width);
} else {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
"integer required"));
}
break;
case 'd':
case 'i':
case 'u':
pfenv_print_mp_int(&pfenv_vstr, arg_as_int(arg), 1, 10, 'a', flags, fill, width, prec);
break;
#if MICROPY_PY_BUILTINS_FLOAT
case 'e':
case 'E':
case 'f':
case 'F':
case 'g':
case 'G':
pfenv_print_float(&pfenv_vstr, mp_obj_get_float(arg), *str, flags, fill, width, prec);
break;
#endif
case 'o':
if (alt) {
flags |= (PF_FLAG_SHOW_PREFIX | PF_FLAG_SHOW_OCTAL_LETTER);
}
pfenv_print_mp_int(&pfenv_vstr, arg, 1, 8, 'a', flags, fill, width, prec);
break;
case 'r':
case 's':
{
vstr_t *arg_vstr = vstr_new();
mp_obj_print_helper((void (*)(void*, const char*, ...))vstr_printf,
arg_vstr, arg, *str == 'r' ? PRINT_REPR : PRINT_STR);
uint vlen = vstr_len(arg_vstr);
if (prec < 0) {
prec = vlen;
}
if (vlen > (uint)prec) {
vlen = prec;
}
pfenv_print_strn(&pfenv_vstr, vstr_str(arg_vstr), vlen, flags, ' ', width);
vstr_free(arg_vstr);
break;
}
case 'X':
case 'x':
pfenv_print_mp_int(&pfenv_vstr, arg, 1, 16, *str - ('X' - 'A'), flags | alt, fill, width, prec);
break;
default:
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
terse_str_format_value_error();
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
"unsupported format character '%c' (0x%x) at index %d",
*str, *str, str - start_str));
}
}
}
if ((uint)arg_i != n_args) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "not all arguments converted during string formatting"));
}
mp_obj_t s = mp_obj_new_str(vstr->buf, vstr->len, false);
vstr_free(vstr);
return s;
}
STATIC mp_obj_t str_replace(mp_uint_t n_args, const mp_obj_t *args) {
assert(MP_OBJ_IS_STR_OR_BYTES(args[0]));
mp_int_t max_rep = -1;
if (n_args == 4) {
max_rep = mp_obj_get_int(args[3]);
if (max_rep == 0) {
return args[0];
} else if (max_rep < 0) {
max_rep = -1;
}
}
// if max_rep is still -1 by this point we will need to do all possible replacements
// check argument types
const mp_obj_type_t *self_type = mp_obj_get_type(args[0]);
if (mp_obj_get_type(args[1]) != self_type) {
bad_implicit_conversion(args[1]);
}
if (mp_obj_get_type(args[2]) != self_type) {
bad_implicit_conversion(args[2]);
}
// extract string data
GET_STR_DATA_LEN(args[0], str, str_len);
GET_STR_DATA_LEN(args[1], old, old_len);
GET_STR_DATA_LEN(args[2], new, new_len);
// old won't exist in str if it's longer, so nothing to replace
if (old_len > str_len) {
return args[0];
}
// data for the replaced string
byte *data = NULL;
mp_obj_t replaced_str = MP_OBJ_NULL;
// do 2 passes over the string:
// first pass computes the required length of the replaced string
// second pass does the replacements
for (;;) {
mp_uint_t replaced_str_index = 0;
mp_uint_t num_replacements_done = 0;
const byte *old_occurrence;
const byte *offset_ptr = str;
mp_uint_t str_len_remain = str_len;
if (old_len == 0) {
// if old_str is empty, copy new_str to start of replaced string
// copy the replacement string
if (data != NULL) {
memcpy(data, new, new_len);
}
replaced_str_index += new_len;
num_replacements_done++;
}
while (num_replacements_done != (mp_uint_t)max_rep && str_len_remain > 0 && (old_occurrence = find_subbytes(offset_ptr, str_len_remain, old, old_len, 1)) != NULL) {
if (old_len == 0) {
old_occurrence += 1;
}
// copy from just after end of last occurrence of to-be-replaced string to right before start of next occurrence
if (data != NULL) {
memcpy(data + replaced_str_index, offset_ptr, old_occurrence - offset_ptr);
}
replaced_str_index += old_occurrence - offset_ptr;
// copy the replacement string
if (data != NULL) {
memcpy(data + replaced_str_index, new, new_len);
}
replaced_str_index += new_len;
offset_ptr = old_occurrence + old_len;
str_len_remain = str + str_len - offset_ptr;
num_replacements_done++;
}
// copy from just after end of last occurrence of to-be-replaced string to end of old string
if (data != NULL) {
memcpy(data + replaced_str_index, offset_ptr, str_len_remain);
}
replaced_str_index += str_len_remain;
if (data == NULL) {
// first pass
if (num_replacements_done == 0) {
// no substr found, return original string
return args[0];
} else {
// substr found, allocate new string
replaced_str = mp_obj_str_builder_start(self_type, replaced_str_index, &data);
assert(data != NULL);
}
} else {
// second pass, we are done
break;
}
}
return mp_obj_str_builder_end(replaced_str);
}
STATIC mp_obj_t str_count(mp_uint_t n_args, const mp_obj_t *args) {
const mp_obj_type_t *self_type = mp_obj_get_type(args[0]);
assert(2 <= n_args && n_args <= 4);
assert(MP_OBJ_IS_STR_OR_BYTES(args[0]));
// check argument type
if (mp_obj_get_type(args[1]) != self_type) {
bad_implicit_conversion(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 needle_len is zero then we count each gap between characters as an occurrence
if (needle_len == 0) {
return MP_OBJ_NEW_SMALL_INT(unichar_charlen((const char*)start, end - start) + 1);
}
// count the occurrences
mp_int_t num_occurrences = 0;
for (const byte *haystack_ptr = start; haystack_ptr + needle_len <= end;) {
if (memcmp(haystack_ptr, needle, needle_len) == 0) {
num_occurrences++;
haystack_ptr += needle_len;
} else {
haystack_ptr = utf8_next_char(haystack_ptr);
}
}
return MP_OBJ_NEW_SMALL_INT(num_occurrences);
}
STATIC mp_obj_t str_partitioner(mp_obj_t self_in, mp_obj_t arg, mp_int_t direction) {
assert(MP_OBJ_IS_STR_OR_BYTES(self_in));
mp_obj_type_t *self_type = mp_obj_get_type(self_in);
if (self_type != mp_obj_get_type(arg)) {
bad_implicit_conversion(arg);
}
GET_STR_DATA_LEN(self_in, str, str_len);
GET_STR_DATA_LEN(arg, sep, sep_len);
if (sep_len == 0) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "empty separator"));
}
mp_obj_t result[3];
if (self_type == &mp_type_str) {
result[0] = MP_OBJ_NEW_QSTR(MP_QSTR_);
result[1] = MP_OBJ_NEW_QSTR(MP_QSTR_);
result[2] = MP_OBJ_NEW_QSTR(MP_QSTR_);
} else {
result[0] = mp_const_empty_bytes;
result[1] = mp_const_empty_bytes;
result[2] = mp_const_empty_bytes;
}
if (direction > 0) {
result[0] = self_in;
} else {
result[2] = self_in;
}
const byte *position_ptr = find_subbytes(str, str_len, sep, sep_len, direction);
if (position_ptr != NULL) {
mp_uint_t position = position_ptr - str;
result[0] = mp_obj_new_str_of_type(self_type, str, position);
result[1] = arg;
result[2] = mp_obj_new_str_of_type(self_type, str + position + sep_len, str_len - position - sep_len);
}
return mp_obj_new_tuple(3, result);
}
STATIC mp_obj_t str_partition(mp_obj_t self_in, mp_obj_t arg) {
return str_partitioner(self_in, arg, 1);
}
STATIC mp_obj_t str_rpartition(mp_obj_t self_in, mp_obj_t arg) {
return str_partitioner(self_in, arg, -1);
}
// Supposedly not too critical operations, so optimize for code size
STATIC mp_obj_t str_caseconv(unichar (*op)(unichar), mp_obj_t self_in) {
GET_STR_DATA_LEN(self_in, self_data, self_len);
byte *data;
mp_obj_t s = mp_obj_str_builder_start(mp_obj_get_type(self_in), self_len, &data);
for (mp_uint_t i = 0; i < self_len; i++) {
*data++ = op(*self_data++);
}
*data = 0;
return mp_obj_str_builder_end(s);
}
STATIC mp_obj_t str_lower(mp_obj_t self_in) {
return str_caseconv(unichar_tolower, self_in);
}
STATIC mp_obj_t str_upper(mp_obj_t self_in) {
return str_caseconv(unichar_toupper, self_in);
}
STATIC mp_obj_t str_uni_istype(bool (*f)(unichar), mp_obj_t self_in) {
GET_STR_DATA_LEN(self_in, self_data, self_len);
if (self_len == 0) {
return mp_const_false; // default to False for empty str
}
if (f != unichar_isupper && f != unichar_islower) {
for (mp_uint_t i = 0; i < self_len; i++) {
if (!f(*self_data++)) {
return mp_const_false;
}
}
} else {
bool contains_alpha = false;
for (mp_uint_t i = 0; i < self_len; i++) { // only check alphanumeric characters
if (unichar_isalpha(*self_data++)) {
contains_alpha = true;
if (!f(*(self_data - 1))) { // -1 because we already incremented above
return mp_const_false;
}
}
}
if (!contains_alpha) {
return mp_const_false;
}
}
return mp_const_true;
}
STATIC mp_obj_t str_isspace(mp_obj_t self_in) {
return str_uni_istype(unichar_isspace, self_in);
}
STATIC mp_obj_t str_isalpha(mp_obj_t self_in) {
return str_uni_istype(unichar_isalpha, self_in);
}
STATIC mp_obj_t str_isdigit(mp_obj_t self_in) {
return str_uni_istype(unichar_isdigit, self_in);
}
STATIC mp_obj_t str_isupper(mp_obj_t self_in) {
return str_uni_istype(unichar_isupper, self_in);
}
STATIC mp_obj_t str_islower(mp_obj_t self_in) {
return str_uni_istype(unichar_islower, self_in);
}
#if MICROPY_CPYTHON_COMPAT
// These methods are superfluous in the presense of str() and bytes()
// constructors.
// TODO: should accept kwargs too
STATIC mp_obj_t bytes_decode(mp_uint_t n_args, const mp_obj_t *args) {
mp_obj_t new_args[2];
if (n_args == 1) {
new_args[0] = args[0];
new_args[1] = MP_OBJ_NEW_QSTR(MP_QSTR_utf_hyphen_8);
args = new_args;
n_args++;
}
return str_make_new(NULL, n_args, 0, args);
}
// TODO: should accept kwargs too
STATIC mp_obj_t str_encode(mp_uint_t n_args, const mp_obj_t *args) {
mp_obj_t new_args[2];
if (n_args == 1) {
new_args[0] = args[0];
new_args[1] = MP_OBJ_NEW_QSTR(MP_QSTR_utf_hyphen_8);
args = new_args;
n_args++;
}
return bytes_make_new(NULL, n_args, 0, args);
}
#endif
mp_int_t mp_obj_str_get_buffer(mp_obj_t self_in, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
if (flags == MP_BUFFER_READ) {
GET_STR_DATA_LEN(self_in, str_data, str_len);
bufinfo->buf = (void*)str_data;
bufinfo->len = str_len;
bufinfo->typecode = 'b';
return 0;
} else {
// can't write to a string
bufinfo->buf = NULL;
bufinfo->len = 0;
bufinfo->typecode = -1;
return 1;
}
}
#if MICROPY_CPYTHON_COMPAT
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(bytes_decode_obj, 1, 3, bytes_decode);
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_encode_obj, 1, 3, str_encode);
#endif
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_find_obj, 2, 4, str_find);
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_rfind_obj, 2, 4, str_rfind);
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_index_obj, 2, 4, str_index);
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_rindex_obj, 2, 4, str_rindex);
MP_DEFINE_CONST_FUN_OBJ_2(str_join_obj, str_join);
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_split_obj, 1, 3, str_split);
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_rsplit_obj, 1, 3, str_rsplit);
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_startswith_obj, 2, 3, str_startswith);
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_endswith_obj, 2, 3, str_endswith);
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_strip_obj, 1, 2, str_strip);
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_lstrip_obj, 1, 2, str_lstrip);
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_rstrip_obj, 1, 2, str_rstrip);
MP_DEFINE_CONST_FUN_OBJ_KW(str_format_obj, 1, mp_obj_str_format);
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_replace_obj, 3, 4, str_replace);
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_count_obj, 2, 4, str_count);
MP_DEFINE_CONST_FUN_OBJ_2(str_partition_obj, str_partition);
MP_DEFINE_CONST_FUN_OBJ_2(str_rpartition_obj, str_rpartition);
MP_DEFINE_CONST_FUN_OBJ_1(str_lower_obj, str_lower);
MP_DEFINE_CONST_FUN_OBJ_1(str_upper_obj, str_upper);
MP_DEFINE_CONST_FUN_OBJ_1(str_isspace_obj, str_isspace);
MP_DEFINE_CONST_FUN_OBJ_1(str_isalpha_obj, str_isalpha);
MP_DEFINE_CONST_FUN_OBJ_1(str_isdigit_obj, str_isdigit);
MP_DEFINE_CONST_FUN_OBJ_1(str_isupper_obj, str_isupper);
MP_DEFINE_CONST_FUN_OBJ_1(str_islower_obj, str_islower);
STATIC const mp_map_elem_t str_locals_dict_table[] = {
#if MICROPY_CPYTHON_COMPAT
{ MP_OBJ_NEW_QSTR(MP_QSTR_decode), (mp_obj_t)&bytes_decode_obj },
#if !MICROPY_PY_BUILTINS_STR_UNICODE
// If we have separate unicode type, then here we have methods only
// for bytes type, and it should not have encode() methods. Otherwise,
// we have non-compliant-but-practical bytestring type, which shares
// method table with bytes, so they both have encode() and decode()
// methods (which should do type checking at runtime).
{ MP_OBJ_NEW_QSTR(MP_QSTR_encode), (mp_obj_t)&str_encode_obj },
#endif
#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);
#if !MICROPY_PY_BUILTINS_STR_UNICODE
const mp_obj_type_t mp_type_str = {
{ &mp_type_type },
.name = MP_QSTR_str,
.print = str_print,
.make_new = str_make_new,
.binary_op = mp_obj_str_binary_op,
.subscr = bytes_subscr,
.getiter = mp_obj_new_str_iterator,
.buffer_p = { .get_buffer = mp_obj_str_get_buffer },
.locals_dict = (mp_obj_t)&str_locals_dict,
};
#endif
// Reuses most of methods from str
const mp_obj_type_t mp_type_bytes = {
{ &mp_type_type },
.name = MP_QSTR_bytes,
.print = str_print,
.make_new = bytes_make_new,
.binary_op = mp_obj_str_binary_op,
.subscr = bytes_subscr,
.getiter = mp_obj_new_bytes_iterator,
.buffer_p = { .get_buffer = mp_obj_str_get_buffer },
.locals_dict = (mp_obj_t)&str_locals_dict,
};
// the zero-length bytes
const mp_obj_str_t mp_const_empty_bytes_obj = {{&mp_type_bytes}, 0, 0, NULL};
mp_obj_t mp_obj_str_builder_start(const mp_obj_type_t *type, mp_uint_t len, byte **data) {
mp_obj_str_t *o = m_new_obj(mp_obj_str_t);
o->base.type = type;
o->len = len;
o->hash = 0;
byte *p = m_new(byte, len + 1);
o->data = p;
*data = p;
return o;
}
mp_obj_t mp_obj_str_builder_end(mp_obj_t o_in) {
mp_obj_str_t *o = o_in;
o->hash = qstr_compute_hash(o->data, o->len);
byte *p = (byte*)o->data;
p[o->len] = '\0'; // for now we add null for compatibility with C ASCIIZ strings
return o;
}
mp_obj_t mp_obj_str_builder_end_with_len(mp_obj_t o_in, mp_uint_t len) {
mp_obj_str_t *o = o_in;
o->data = m_renew(byte, (byte*)o->data, o->len + 1, len + 1);
o->len = len;
o->hash = qstr_compute_hash(o->data, o->len);
byte *p = (byte*)o->data;
p[o->len] = '\0'; // for now we add null for compatibility with C ASCIIZ strings
return o;
}
mp_obj_t mp_obj_new_str_of_type(const mp_obj_type_t *type, const byte* data, mp_uint_t len) {
mp_obj_str_t *o = m_new_obj(mp_obj_str_t);
o->base.type = type;
o->len = len;
if (data) {
o->hash = qstr_compute_hash(data, len);
byte *p = m_new(byte, len + 1);
o->data = p;
memcpy(p, data, len * sizeof(byte));
p[len] = '\0'; // for now we add null for compatibility with C ASCIIZ strings
}
return o;
}
mp_obj_t mp_obj_new_str(const char* data, mp_uint_t len, bool make_qstr_if_not_already) {
if (make_qstr_if_not_already) {
// use existing, or make a new qstr
return MP_OBJ_NEW_QSTR(qstr_from_strn(data, len));
} else {
qstr q = qstr_find_strn(data, len);
if (q != MP_QSTR_NULL) {
// qstr with this data already exists
return MP_OBJ_NEW_QSTR(q);
} else {
// no existing qstr, don't make one
return mp_obj_new_str_of_type(&mp_type_str, (const byte*)data, len);
}
}
}
mp_obj_t mp_obj_str_intern(mp_obj_t str) {
GET_STR_DATA_LEN(str, data, len);
return MP_OBJ_NEW_QSTR(qstr_from_strn((const char*)data, len));
}
mp_obj_t mp_obj_new_bytes(const byte* data, mp_uint_t len) {
return mp_obj_new_str_of_type(&mp_type_bytes, data, len);
}
bool mp_obj_str_equal(mp_obj_t s1, mp_obj_t s2) {
if (MP_OBJ_IS_QSTR(s1) && MP_OBJ_IS_QSTR(s2)) {
return s1 == s2;
} else {
GET_STR_HASH(s1, h1);
GET_STR_HASH(s2, h2);
// If any of hashes is 0, it means it's not valid
if (h1 != 0 && h2 != 0 && h1 != h2) {
return false;
}
GET_STR_DATA_LEN(s1, d1, l1);
GET_STR_DATA_LEN(s2, d2, l2);
if (l1 != l2) {
return false;
}
return memcmp(d1, d2, l1) == 0;
}
}
STATIC void bad_implicit_conversion(mp_obj_t self_in) {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
"can't convert to str implicitly"));
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"can't convert '%s' object to str implicitly",
mp_obj_get_type_str(self_in)));
}
}
mp_uint_t mp_obj_str_get_hash(mp_obj_t self_in) {
// TODO: This has too big overhead for hash accessor
if (MP_OBJ_IS_STR_OR_BYTES(self_in)) {
GET_STR_HASH(self_in, h);
return h;
} else {
bad_implicit_conversion(self_in);
}
}
mp_uint_t mp_obj_str_get_len(mp_obj_t self_in) {
// TODO This has a double check for the type, one in obj.c and one here
if (MP_OBJ_IS_STR_OR_BYTES(self_in)) {
GET_STR_LEN(self_in, l);
return l;
} else {
bad_implicit_conversion(self_in);
}
}
// use this if you will anyway convert the string to a qstr
// will be more efficient for the case where it's already a qstr
qstr mp_obj_str_get_qstr(mp_obj_t self_in) {
if (MP_OBJ_IS_QSTR(self_in)) {
return MP_OBJ_QSTR_VALUE(self_in);
} else if (MP_OBJ_IS_TYPE(self_in, &mp_type_str)) {
mp_obj_str_t *self = self_in;
return qstr_from_strn((char*)self->data, self->len);
} else {
bad_implicit_conversion(self_in);
}
}
// only use this function if you need the str data to be zero terminated
// at the moment all strings are zero terminated to help with C ASCIIZ compatibility
const char *mp_obj_str_get_str(mp_obj_t self_in) {
if (MP_OBJ_IS_STR_OR_BYTES(self_in)) {
GET_STR_DATA_LEN(self_in, s, l);
(void)l; // len unused
return (const char*)s;
} else {
bad_implicit_conversion(self_in);
}
}
const char *mp_obj_str_get_data(mp_obj_t self_in, mp_uint_t *len) {
if (MP_OBJ_IS_STR_OR_BYTES(self_in)) {
GET_STR_DATA_LEN(self_in, s, l);
*len = l;
return (const char*)s;
} else {
bad_implicit_conversion(self_in);
}
}
/******************************************************************************/
/* str iterator */
typedef struct _mp_obj_str_it_t {
mp_obj_base_t base;
mp_obj_t str;
mp_uint_t cur;
} mp_obj_str_it_t;
#if !MICROPY_PY_BUILTINS_STR_UNICODE
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) {
mp_obj_t o_out = mp_obj_new_str((const char*)str + self->cur, 1, true);
self->cur += 1;
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
STATIC mp_obj_t bytes_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) {
mp_obj_t o_out = MP_OBJ_NEW_SMALL_INT(str[self->cur]);
self->cur += 1;
return o_out;
} else {
return MP_OBJ_STOP_ITERATION;
}
}
STATIC const mp_obj_type_t mp_type_bytes_it = {
{ &mp_type_type },
.name = MP_QSTR_iterator,
.getiter = mp_identity,
.iternext = bytes_it_iternext,
};
mp_obj_t mp_obj_new_bytes_iterator(mp_obj_t str) {
mp_obj_str_it_t *o = m_new_obj(mp_obj_str_it_t);
o->base.type = &mp_type_bytes_it;
o->str = str;
o->cur = 0;
return o;
}
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