85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include "ff.h"
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#include "misc.h"
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#include "lexer.h"
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#include "lexerfatfs.h"
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typedef struct _mp_lexer_file_buf_t {
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FIL fp;
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char buf[20];
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uint16_t len;
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uint16_t pos;
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} mp_lexer_file_buf_t;
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static unichar file_buf_next_char(mp_lexer_file_buf_t *fb) {
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if (fb->pos >= fb->len) {
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if (fb->len < sizeof(fb->buf)) {
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return MP_LEXER_CHAR_EOF;
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} else {
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UINT n;
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f_read(&fb->fp, fb->buf, sizeof(fb->buf), &n);
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if (n == 0) {
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return MP_LEXER_CHAR_EOF;
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}
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fb->len = n;
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fb->pos = 0;
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}
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}
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return fb->buf[fb->pos++];
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}
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static void file_buf_close(mp_lexer_file_buf_t *fb) {
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f_close(&fb->fp);
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m_del_obj(mp_lexer_file_buf_t, fb);
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}
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mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
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mp_lexer_file_buf_t *fb = m_new_obj(mp_lexer_file_buf_t);
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FRESULT res = f_open(&fb->fp, filename, FA_READ);
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if (res != FR_OK) {
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m_del_obj(mp_lexer_file_buf_t, fb);
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return NULL;
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}
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UINT n;
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f_read(&fb->fp, fb->buf, sizeof(fb->buf), &n);
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fb->len = n;
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fb->pos = 0;
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return mp_lexer_new(filename, fb, (mp_lexer_stream_next_char_t)file_buf_next_char, (mp_lexer_stream_close_t)file_buf_close);
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}
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/******************************************************************************/
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// implementation of import
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#include "ff.h"
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mp_lexer_t *mp_import_open_file(qstr mod_name) {
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vstr_t *vstr = vstr_new();
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FRESULT res;
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// look for module in src/
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vstr_printf(vstr, "0:/src/%s.py", qstr_str(mod_name));
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res = f_stat(vstr_str(vstr), NULL);
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if (res == FR_OK) {
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// found file
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return mp_lexer_new_from_file(vstr_str(vstr)); // TODO does lexer need to copy the string? can we free it here?
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}
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// look for module in /
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vstr_reset(vstr);
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vstr_printf(vstr, "0:/%s.py", qstr_str(mod_name));
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res = f_stat(vstr_str(vstr), NULL);
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if (res == FR_OK) {
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// found file
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return mp_lexer_new_from_file(vstr_str(vstr)); // TODO does lexer need to copy the string? can we free it here?
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}
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// could not find file
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vstr_free(vstr);
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printf("import %s: could not find file in src/ or /\n", qstr_str(mod_name));
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return NULL;
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}
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