sql_lexer_parser_state.h

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/*
  Copyright (c) 2022, 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.
 
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  as designated in a particular file or component or in included license
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  permission to link the program and your derivative works with the
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  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 for more details.
 
  You should have received a copy of the GNU General Public License
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  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
 
#ifndef ROUTING_SQL_LEXER_PARSER_STATE_INCLUDED
#define ROUTING_SQL_LEXER_PARSER_STATE_INCLUDED
 
#include <cstdlib>
 
#include "sql_lexer_input_stream.h"
#include "sql_lexer_parser_input.h"
#include "sql_lexer_yacc_state.h"
 
class THD;
 
/**
  Internal state of the parser.
  The complete state consist of:
  - input parameters that control the parser behavior
  - state data used during lexical parsing,
  - state data used during syntactic parsing.
*/
class Parser_state {
 protected:
  /**
    Constructor for special parsers of partial SQL clauses (DD)
 
    @param grammar_selector_token   See Lex_input_stream::grammar_selector_token
  */
  explicit Parser_state(int grammar_selector_token)
      : m_input(), m_lip(grammar_selector_token), m_yacc(), m_comment(false) {}
 
 public:
  Parser_state() : m_input(), m_lip(~0U), m_yacc(), m_comment(false) {}
 
  /**
     Object initializer. Must be called before usage.
 
     @retval false OK
     @retval true  Error
  */
  bool init(THD *thd, const char *buff, size_t length) {
    return m_lip.init(thd, buff, length);
  }
 
  void reset(const char *found_semicolon, size_t length) {
    m_lip.reset(found_semicolon, length);
    m_yacc.reset();
  }
 
  /// Signal that the current query has a comment
  void add_comment() { m_comment = true; }
  /// Check whether the current query has a comment
  bool has_comment() const { return m_comment; }
 
 public:
  Parser_input m_input;
  Lex_input_stream m_lip;
  Yacc_state m_yacc;
#if 0
  /**
    Current performance digest instrumentation.
  */
  PSI_digest_locker *m_digest_psi;
#endif
 private:
  bool m_comment;  ///< True if current query contains comments
};
 
#endif