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#include <stdint.h>
#include <stdio.h>
#include "ff.h"
#include "misc.h"
#include "lexer.h"
#include "lexerfatfs.h"
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(filename, fb, (mp_lexer_stream_next_char_t)file_buf_next_char, (mp_lexer_stream_close_t)file_buf_close);
}
/******************************************************************************/
// implementation of import
#include "ff.h"
mp_lexer_t *mp_import_open_file(qstr mod_name) {
vstr_t *vstr = vstr_new();
FRESULT res;
// look for module in src/
vstr_printf(vstr, "0:/src/%s.py", qstr_str(mod_name));
res = f_stat(vstr_str(vstr), NULL);
if (res == FR_OK) {
// found file
return mp_lexer_new_from_file(vstr_str(vstr)); // TODO does lexer need to copy the string? can we free it here?
}
// look for module in /
vstr_reset(vstr);
vstr_printf(vstr, "0:/%s.py", qstr_str(mod_name));
res = f_stat(vstr_str(vstr), NULL);
if (res == FR_OK) {
// found file
return mp_lexer_new_from_file(vstr_str(vstr)); // TODO does lexer need to copy the string? can we free it here?
}
// could not find file
vstr_free(vstr);
printf("import %s: could not find file in src/ or /\n", qstr_str(mod_name));
return NULL;
}
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