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280 lines
10 KiB
280 lines
10 KiB
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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* Copyright (c) 2014-2016 Paul Sokolovsky
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include <assert.h>
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#include "py/objstr.h"
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#include "py/objlist.h"
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#include "py/runtime.h"
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#if MICROPY_PY_BUILTINS_STR_UNICODE
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STATIC mp_obj_t mp_obj_new_str_iterator(mp_obj_t str, mp_obj_iter_buf_t *iter_buf);
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/******************************************************************************/
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/* str */
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STATIC void uni_print_quoted(const mp_print_t *print, const byte *str_data, uint str_len) {
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// this escapes characters, but it will be very slow to print (calling print many times)
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bool has_single_quote = false;
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bool has_double_quote = false;
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for (const byte *s = str_data, *top = str_data + str_len; !has_double_quote && s < top; s++) {
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if (*s == '\'') {
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has_single_quote = true;
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} else if (*s == '"') {
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has_double_quote = true;
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}
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}
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unichar quote_char = '\'';
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if (has_single_quote && !has_double_quote) {
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quote_char = '"';
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}
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mp_printf(print, "%c", quote_char);
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const byte *s = str_data, *top = str_data + str_len;
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while (s < top) {
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unichar ch;
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ch = utf8_get_char(s);
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s = utf8_next_char(s);
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if (ch == quote_char) {
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mp_printf(print, "\\%c", quote_char);
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} else if (ch == '\\') {
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mp_print_str(print, "\\\\");
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} else if (32 <= ch && ch <= 126) {
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mp_printf(print, "%c", ch);
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} else if (ch == '\n') {
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mp_print_str(print, "\\n");
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} else if (ch == '\r') {
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mp_print_str(print, "\\r");
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} else if (ch == '\t') {
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mp_print_str(print, "\\t");
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} else if (ch < 0x100) {
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mp_printf(print, "\\x%02x", ch);
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} else if (ch < 0x10000) {
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mp_printf(print, "\\u%04x", ch);
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} else {
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mp_printf(print, "\\U%08x", ch);
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}
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}
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mp_printf(print, "%c", quote_char);
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}
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STATIC void uni_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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GET_STR_DATA_LEN(self_in, str_data, str_len);
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#if MICROPY_PY_JSON
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if (kind == PRINT_JSON) {
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mp_str_print_json(print, str_data, str_len);
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return;
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}
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#endif
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if (kind == PRINT_STR) {
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print->print_strn(print->data, (const char *)str_data, str_len);
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} else {
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uni_print_quoted(print, str_data, str_len);
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}
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}
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STATIC mp_obj_t uni_unary_op(mp_unary_op_t op, mp_obj_t self_in) {
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GET_STR_DATA_LEN(self_in, str_data, str_len);
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switch (op) {
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case MP_UNARY_OP_BOOL:
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return mp_obj_new_bool(str_len != 0);
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case MP_UNARY_OP_LEN:
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return MP_OBJ_NEW_SMALL_INT(utf8_charlen(str_data, str_len));
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default:
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return MP_OBJ_NULL; // op not supported
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}
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}
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// Convert an index into a pointer to its lead byte. Out of bounds indexing will raise IndexError or
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// be capped to the first/last character of the string, depending on is_slice.
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const byte *str_index_to_ptr(const mp_obj_type_t *type, const byte *self_data, size_t self_len,
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mp_obj_t index, bool is_slice) {
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// All str functions also handle bytes objects, and they call str_index_to_ptr(),
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// so it must handle bytes.
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if (type == &mp_type_bytes
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#if MICROPY_PY_BUILTINS_BYTEARRAY
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|| type == &mp_type_bytearray
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#endif
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) {
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// Taken from objstr.c:str_index_to_ptr()
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size_t index_val = mp_get_index(type, self_len, index, is_slice);
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return self_data + index_val;
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}
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mp_int_t i;
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// Copied from mp_get_index; I don't want bounds checking, just give me
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// the integer as-is. (I can't bounds-check without scanning the whole
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// string; an out-of-bounds index will be caught in the loops below.)
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if (mp_obj_is_small_int(index)) {
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i = MP_OBJ_SMALL_INT_VALUE(index);
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} else if (!mp_obj_get_int_maybe(index, &i)) {
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mp_raise_msg_varg(&mp_type_TypeError, MP_ERROR_TEXT("string indices must be integers, not %s"), mp_obj_get_type_str(index));
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}
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const byte *s, *top = self_data + self_len;
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if (i < 0) {
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// Negative indexing is performed by counting from the end of the string.
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for (s = top - 1; i; --s) {
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if (s < self_data) {
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if (is_slice) {
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return self_data;
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}
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mp_raise_msg(&mp_type_IndexError, MP_ERROR_TEXT("string index out of range"));
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}
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if (!UTF8_IS_CONT(*s)) {
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++i;
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}
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}
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++s;
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} else {
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// Positive indexing, correspondingly, counts from the start of the string.
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// It's assumed that negative indexing will generally be used with small
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// absolute values (eg str[-1], not str[-1000000]), which means it'll be
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// more efficient this way.
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s = self_data;
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while (1) {
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// First check out-of-bounds
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if (s >= top) {
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if (is_slice) {
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return top;
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}
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mp_raise_msg(&mp_type_IndexError, MP_ERROR_TEXT("string index out of range"));
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}
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// Then check completion
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if (i-- == 0) {
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break;
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}
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// Then skip UTF-8 char
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++s;
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while (UTF8_IS_CONT(*s)) {
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++s;
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}
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}
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}
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return s;
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}
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STATIC mp_obj_t str_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
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const mp_obj_type_t *type = mp_obj_get_type(self_in);
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assert(type == &mp_type_str);
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GET_STR_DATA_LEN(self_in, self_data, self_len);
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if (value == MP_OBJ_SENTINEL) {
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// load
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#if MICROPY_PY_BUILTINS_SLICE
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if (mp_obj_is_type(index, &mp_type_slice)) {
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mp_obj_t ostart, ostop, ostep;
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mp_obj_slice_t *slice = MP_OBJ_TO_PTR(index);
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ostart = slice->start;
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ostop = slice->stop;
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ostep = slice->step;
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if (ostep != mp_const_none && ostep != MP_OBJ_NEW_SMALL_INT(1)) {
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mp_raise_NotImplementedError(MP_ERROR_TEXT("only slices with step=1 (aka None) are supported"));
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}
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const byte *pstart, *pstop;
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if (ostart != mp_const_none) {
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pstart = str_index_to_ptr(type, self_data, self_len, ostart, true);
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} else {
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pstart = self_data;
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}
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if (ostop != mp_const_none) {
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// pstop will point just after the stop character. This depends on
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// the \0 at the end of the string.
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pstop = str_index_to_ptr(type, self_data, self_len, ostop, true);
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} else {
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pstop = self_data + self_len;
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}
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if (pstop < pstart) {
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return MP_OBJ_NEW_QSTR(MP_QSTR_);
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}
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return mp_obj_new_str_of_type(type, (const byte *)pstart, pstop - pstart);
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}
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#endif
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const byte *s = str_index_to_ptr(type, self_data, self_len, index, false);
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int len = 1;
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if (UTF8_IS_NONASCII(*s)) {
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// Count the number of 1 bits (after the first)
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for (char mask = 0x40; *s & mask; mask >>= 1) {
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++len;
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}
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}
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return mp_obj_new_str_via_qstr((const char *)s, len); // This will create a one-character string
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} else {
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return MP_OBJ_NULL; // op not supported
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}
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}
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MP_DEFINE_CONST_OBJ_TYPE(
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mp_type_str,
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MP_QSTR_str,
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MP_TYPE_FLAG_ITER_IS_GETITER,
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make_new, mp_obj_str_make_new,
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print, uni_print,
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unary_op, uni_unary_op,
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binary_op, mp_obj_str_binary_op,
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subscr, str_subscr,
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iter, mp_obj_new_str_iterator,
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buffer, mp_obj_str_get_buffer,
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locals_dict, &mp_obj_str_locals_dict
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);
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/******************************************************************************/
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/* str iterator */
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typedef struct _mp_obj_str_it_t {
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mp_obj_base_t base;
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mp_fun_1_t iternext;
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mp_obj_t str;
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size_t cur;
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} mp_obj_str_it_t;
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STATIC mp_obj_t str_it_iternext(mp_obj_t self_in) {
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mp_obj_str_it_t *self = MP_OBJ_TO_PTR(self_in);
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GET_STR_DATA_LEN(self->str, str, len);
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if (self->cur < len) {
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const byte *cur = str + self->cur;
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const byte *end = utf8_next_char(str + self->cur);
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mp_obj_t o_out = mp_obj_new_str_via_qstr((const char *)cur, end - cur);
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self->cur += end - cur;
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return o_out;
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} else {
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return MP_OBJ_STOP_ITERATION;
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}
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}
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STATIC mp_obj_t mp_obj_new_str_iterator(mp_obj_t str, mp_obj_iter_buf_t *iter_buf) {
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assert(sizeof(mp_obj_str_it_t) <= sizeof(mp_obj_iter_buf_t));
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mp_obj_str_it_t *o = (mp_obj_str_it_t *)iter_buf;
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o->base.type = &mp_type_polymorph_iter;
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o->iternext = str_it_iternext;
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o->str = str;
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o->cur = 0;
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return MP_OBJ_FROM_PTR(o);
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}
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#endif // MICROPY_PY_BUILTINS_STR_UNICODE
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