circuitpython/py/lexerstr.c

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#include <stdint.h>
#include <stdio.h>
#include "misc.h"
#include "lexer.h"
typedef struct _mp_lexer_str_buf_t {
uint free_len; // if > 0, src_beg will be freed when done by: m_free(src_beg, free_len)
const char *src_beg; // beginning of source
const char *src_cur; // current location in source
const char *src_end; // end (exclusive) of source
} mp_lexer_str_buf_t;
static unichar str_buf_next_char(mp_lexer_str_buf_t *sb) {
if (sb->src_cur < sb->src_end) {
return *sb->src_cur++;
} else {
return MP_LEXER_CHAR_EOF;
}
}
static void str_buf_free(mp_lexer_str_buf_t *sb) {
if (sb->free_len > 0) {
m_free((char*)sb->src_beg, sb->free_len);
}
}
mp_lexer_t *mp_lexer_new_from_str_len(const char *src_name, const char *str, uint len, uint free_len) {
mp_lexer_str_buf_t *sb = m_new_obj(mp_lexer_str_buf_t);
sb->free_len = free_len;
sb->src_beg = str;
sb->src_cur = str;
sb->src_end = str + len;
return mp_lexer_new(src_name, sb, (mp_lexer_stream_next_char_t)str_buf_next_char, (mp_lexer_stream_close_t)str_buf_free);
}