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lexerstr.c

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 parse-bytecode

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lexerstr.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

*

* 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 "py/lexer.h"

#if MICROPY_ENABLE_COMPILER

typedef struct _mp_lexer_str_buf_t {

mp_uint_t free_len; // if > 0, src_beg will be freed when done by: m_free(src_beg, free_len)

const char *src_beg; // beginning of source

const char *src_cur; // current location in source

const char *src_end; // end (exclusive) of source

} mp_lexer_str_buf_t;

STATIC mp_uint_t str_buf_next_byte(mp_lexer_str_buf_t *sb) {

if (sb->src_cur < sb->src_end) {

return *sb->src_cur++;

} else {

return MP_LEXER_EOF;

}

}

STATIC void str_buf_free(mp_lexer_str_buf_t *sb) {

if (sb->free_len > 0) {

m_del(char, (char*)sb->src_beg, sb->free_len);

}

m_del_obj(mp_lexer_str_buf_t, sb);

}

mp_lexer_t *mp_lexer_new_from_str_len(qstr src_name, const char *str, mp_uint_t len, mp_uint_t free_len) {

mp_lexer_str_buf_t *sb = m_new_obj_maybe(mp_lexer_str_buf_t);

if (sb == NULL) {

return NULL;

}

sb->free_len = free_len;

sb->src_beg = str;

sb->src_cur = str;

sb->src_end = str + len;

return mp_lexer_new(src_name, sb, (mp_lexer_stream_next_byte_t)str_buf_next_byte, (mp_lexer_stream_close_t)str_buf_free);

}

#endif // MICROPY_ENABLE_COMPILER