/* Copyright (c) 2008, 2025, Oracle and/or its affiliates.

  This program is free software; you can redistribute it and/or modify

  it under the terms of the GNU General Public License, version 2.0,

  as published by the Free Software Foundation.

  This program is designed to work with certain software (including

  but not limited to OpenSSL) that is licensed under separate terms,

  as designated in a particular file or component or in included license

  documentation.  The authors of MySQL hereby grant you an additional

  permission to link the program and your derivative works with the

  separately licensed software that they have either included with

  the program or referenced in the documentation.

  This program is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  GNU General Public License, version 2.0, for more details.

  You should have received a copy of the GNU General Public License

  along with this program; if not, write to the Free Software

  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#ifndef SQL_DIGEST_STREAM_H

#define SQL_DIGEST_STREAM_H

#include "sql/sql_digest.h"

union Lexer_yystype;

/**

  State data storage for @c digest_start, @c digest_add_token.

  This structure extends the @c sql_digest_storage structure

  with temporary state used only during parsing.

*/

struct sql_digest_state {

  /**

    Index, in the digest token array, of the last identifier seen.

    Reduce rules used in the digest computation can not

    apply to tokens seen before an identifier.

    @sa digest_add_token

  */

  int m_last_id_index;

  sql_digest_storage m_digest_storage;

  inline void reset(unsigned char *token_array, uint length) {

    m_last_id_index = 0;

    m_digest_storage.reset(token_array, length);

  }

  inline bool is_empty() { return m_digest_storage.is_empty(); }

};

typedef struct sql_digest_state sql_digest_state;

sql_digest_state *digest_add_token(sql_digest_state *state, uint token,

                                   Lexer_yystype *yylval);

sql_digest_state *digest_reduce_token(sql_digest_state *state, uint token_left,

                                      uint token_right);

#endif