Method cmp

deps/tesseract/ccstruct/pageres.cpp:1201–1263

}

int PAGE_RES_IT::cmp(const PAGE_RES_IT &other) const {
  ASSERT_HOST(page_res == other.page_res);
  if (other.block_res == NULL) {
    // other points to the end of the page.
    if (block_res == NULL)
      return 0;
    return -1;
  }
  if (block_res == NULL) {
    return 1; // we point to the end of the page.
  }
  if (block_res == other.block_res) {
    if (other.row_res == NULL || row_res == NULL) {
      // this should only happen if we hit an image block.
      return 0;
    }
    if (row_res == other.row_res) {
      // we point to the same block and row.
      ASSERT_HOST(other.word_res != NULL && word_res != NULL);
      if (word_res == other.word_res) {
        // we point to the same word!
        return 0;
      }

      WERD_RES_IT word_res_it(&row_res->word_res_list);
      for (word_res_it.mark_cycle_pt(); !word_res_it.cycled_list();
           word_res_it.forward()) {
        if (word_res_it.data() == word_res) {
          return -1;
        } else if (word_res_it.data() == other.word_res) {
          return 1;
        }
      }
      ASSERT_HOST("Error: Incomparable PAGE_RES_ITs" == NULL);
    }

    // we both point to the same block, but different rows.
    ROW_RES_IT row_res_it(&block_res->row_res_list);
    for (row_res_it.mark_cycle_pt(); !row_res_it.cycled_list();
         row_res_it.forward()) {
      if (row_res_it.data() == row_res) {
        return -1;
      } else if (row_res_it.data() == other.row_res) {
        return 1;
      }
    }
    ASSERT_HOST("Error: Incomparable PAGE_RES_ITs" == NULL);
  }

  // We point to different blocks.
  BLOCK_RES_IT block_res_it(&page_res->block_res_list);
  for (block_res_it.mark_cycle_pt();
       !block_res_it.cycled_list(); block_res_it.forward()) {
    if (block_res_it.data() == block_res) {
      return -1;
    } else if (block_res_it.data() == other.block_res) {
      return 1;
    }