65 lines
2.4 KiB
C
65 lines
2.4 KiB
C
/*
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* This file is part of the Micro Python 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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*
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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 "mpconfig.h"
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#include "misc.h"
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#include "qstr.h"
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#include "lexer.h"
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typedef struct _mp_lexer_str_buf_t {
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mp_uint_t free_len; // if > 0, src_beg will be freed when done by: m_free(src_beg, free_len)
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const char *src_beg; // beginning of source
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const char *src_cur; // current location in source
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const char *src_end; // end (exclusive) of source
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} mp_lexer_str_buf_t;
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STATIC mp_uint_t str_buf_next_byte(mp_lexer_str_buf_t *sb) {
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if (sb->src_cur < sb->src_end) {
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return *sb->src_cur++;
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} else {
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return MP_LEXER_EOF;
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}
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}
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STATIC void str_buf_free(mp_lexer_str_buf_t *sb) {
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if (sb->free_len > 0) {
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m_free((char*)sb->src_beg, sb->free_len);
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}
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m_del_obj(mp_lexer_str_buf_t, sb);
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}
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mp_lexer_t *mp_lexer_new_from_str_len(qstr src_name, const char *str, mp_uint_t len, mp_uint_t free_len) {
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mp_lexer_str_buf_t *sb = m_new_obj_maybe(mp_lexer_str_buf_t);
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if (sb == NULL) {
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return NULL;
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}
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sb->free_len = free_len;
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sb->src_beg = str;
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sb->src_cur = str;
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sb->src_end = str + len;
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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);
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}
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