text: /*
   * This file is part of the MicroPython project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2013-2016 Damien P. George
   * Copyright (c) 2016 Paul Sokolovsky
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  #include "py/lexer.h"
  
  #if MICROPY_ENABLE_COMPILER
  
  typedef struct _mp_lexer_str32_buf_t {
      const uint32_t *src_cur;
      uint32_t val;
      uint8_t byte_off;
  } mp_lexer_str32_buf_t;
  
  STATIC mp_uint_t str32_buf_next_byte(mp_lexer_str32_buf_t *sb) {
      byte c = sb->val & 0xff;
      if (c == 0) {
          return MP_LEXER_EOF;
      }
  
      if (++sb->byte_off > 3) {
          sb->byte_off = 0;
          sb->val = *sb->src_cur++;
      } else {
          sb->val >>= 8;
      }
  
      return c;
  }
  
  STATIC void str32_buf_free(mp_lexer_str32_buf_t *sb) {
      m_del_obj(mp_lexer_str32_buf_t, sb);
  }
  
  mp_lexer_t *mp_lexer_new_from_str32(qstr src_name, const char *str, mp_uint_t len, mp_uint_t free_len) {
      mp_lexer_str32_buf_t *sb = m_new_obj_maybe(mp_lexer_str32_buf_t);
      if (sb == NULL) {
          return NULL;
      }
      sb->byte_off = (uint32_t)str & 3;
      sb->src_cur = (uint32_t*)(str - sb->byte_off);
      sb->val = *sb->src_cur++ >> sb->byte_off * 8;
      return mp_lexer_new(src_name, sb, (mp_lexer_stream_next_byte_t)str32_buf_next_byte, (mp_lexer_stream_close_t)str32_buf_free);
  }
  
  #endif // MICROPY_ENABLE_COMPILER
  