circuitpython/stm/lexerstm.c

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#include <stdint.h>
#include <stdio.h>
#include "ff.h"
#include "misc.h"
#include "lexer.h"
#include "lexerstm.h"
unichar str_buf_next_char(py_lexer_str_buf_t *sb) {
if (sb->src_cur < sb->src_end) {
return *sb->src_cur++;
} else {
return PY_LEXER_CHAR_EOF;
}
}
void str_buf_free(py_lexer_str_buf_t *sb) {
if (sb->free) {
m_free((char*)sb->src_beg);
}
}
py_lexer_t *py_lexer_new_from_str_len(const char *src_name, const char *str, uint len, bool free_str, py_lexer_str_buf_t *sb) {
sb->free = free_str;
sb->src_beg = str;
sb->src_cur = str;
sb->src_end = str + len;
return py_lexer_new(src_name, sb, (py_lexer_stream_next_char_t)str_buf_next_char, (py_lexer_stream_close_t)str_buf_free);
}
unichar file_buf_next_char(py_lexer_file_buf_t *fb) {
if (fb->pos >= fb->len) {
if (fb->len < sizeof(fb->buf)) {
return PY_LEXER_CHAR_EOF;
} else {
UINT n;
f_read(&fb->fp, fb->buf, sizeof(fb->buf), &n);
if (n == 0) {
return PY_LEXER_CHAR_EOF;
}
fb->len = n;
fb->pos = 0;
}
}
return fb->buf[fb->pos++];
}
void file_buf_close(py_lexer_file_buf_t *fb) {
f_close(&fb->fp);
}
py_lexer_t *py_lexer_new_from_file(const char *filename, py_lexer_file_buf_t *fb) {
FRESULT res = f_open(&fb->fp, filename, FA_READ);
if (res != FR_OK) {
return NULL;
}
UINT n;
f_read(&fb->fp, fb->buf, sizeof(fb->buf), &n);
fb->len = n;
fb->pos = 0;
return py_lexer_new(filename, fb, (py_lexer_stream_next_char_t)file_buf_next_char, (py_lexer_stream_close_t)file_buf_close);
}