1 files changed, 35 insertions, 0 deletions
diff --git a/py/lexerstr.c b/py/lexerstr.c
new file mode 100644
index 0000000000..b8594f4205
--- /dev/null
+++ b/py/lexerstr.c
@@ -0,0 +1,35 @@
+#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);
+}