sql_lexer.h

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/*
  Copyright (c) 2022, 2024, Oracle and/or its affiliates.
 
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  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.
 
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  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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*/
 
#ifndef ROUTING_SQL_LEXER_INCLUDED
#define ROUTING_SQL_LEXER_INCLUDED
 
#include <string_view>
 
#include "sql/lexer_yystype.h"
 
class THD;
 
class SqlLexer {
 public:
  using TokenId = int;
 
  SqlLexer(THD *session);
 
  /**
   * init the library that's used by the lexer.
   *
   * NOT thread-safe, MUST be called before threads are spawned.
   */
  static void init_library();
 
  class iterator {
   public:
    struct Token {
      std::string_view text;
      TokenId id;
    };
 
    using lexer_state = Lexer_yystype;
    using value_type = Token;
    using pointer = value_type *;
    using const_pointer = const value_type *;
 
    iterator(THD *session);
 
    iterator(THD *session, Token token)
        : session_(session), token_{std::move(token)} {}
 
    value_type operator*() const { return token_; }
    pointer operator->() { return &token_; }
    const_pointer operator->() const { return &token_; }
 
    iterator operator++(int);
    iterator &operator++();
 
    friend bool operator==(const iterator &a, const iterator &b);
    friend bool operator!=(const iterator &a, const iterator &b);
 
   private:
    Token next_token();
    std::string_view get_token_text(TokenId token_id) const;
 
    THD *session_;
    lexer_state st;
 
    Token token_;
  };
 
  iterator begin() { return iterator(session_); }
  iterator end() { return iterator(nullptr); }
 
 private:
  THD *session_;
};
 
#endif