lexerfatfs.c 2.54 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
/*
 * 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.
 */

27
28
29
30
#include <stdint.h>
#include <stdio.h>

#include "mpconfig.h"
31
#include "misc.h"
32
33
34
#include "qstr.h"
#include "lexer.h"
#include "lexerfatfs.h"
35
#include "ff.h"
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78

typedef struct _mp_lexer_file_buf_t {
    FIL fp;
    char buf[20];
    uint16_t len;
    uint16_t pos;
} mp_lexer_file_buf_t;

static unichar file_buf_next_char(mp_lexer_file_buf_t *fb) {
    if (fb->pos >= fb->len) {
        if (fb->len < sizeof(fb->buf)) {
            return MP_LEXER_CHAR_EOF;
        } else {
            UINT n;
            f_read(&fb->fp, fb->buf, sizeof(fb->buf), &n);
            if (n == 0) {
                return MP_LEXER_CHAR_EOF;
            }
            fb->len = n;
            fb->pos = 0;
        }
    }
    return fb->buf[fb->pos++];
}

static void file_buf_close(mp_lexer_file_buf_t *fb) {
    f_close(&fb->fp);
    m_del_obj(mp_lexer_file_buf_t, fb);
}

mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
    mp_lexer_file_buf_t *fb = m_new_obj(mp_lexer_file_buf_t);
    FRESULT res = f_open(&fb->fp, filename, FA_READ);
    if (res != FR_OK) {
        m_del_obj(mp_lexer_file_buf_t, fb);
        return NULL;
    }
    UINT n;
    f_read(&fb->fp, fb->buf, sizeof(fb->buf), &n);
    fb->len = n;
    fb->pos = 0;
    return mp_lexer_new(qstr_from_str(filename), fb, (mp_lexer_stream_next_char_t)file_buf_next_char, (mp_lexer_stream_close_t)file_buf_close);
}