text: // A Bison parser, made by GNU Bison 3.7.2.
  
  // Skeleton implementation for Bison LALR(1) parsers in C++
  
  // Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
  
  // This program is free software: you can redistribute it and/or modify
  // it under the terms of the GNU General Public License as published by
  // the Free Software Foundation, either version 3 of the License, or
  // (at your option) any later version.
  
  // 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
  // along with this program.  If not, see <http://www.gnu.org/licenses/>.
  
  // As a special exception, you may create a larger work that contains
  // part or all of the Bison parser skeleton and distribute that work
  // under terms of your choice, so long as that work isn't itself a
  // parser generator using the skeleton or a modified version thereof
  // as a parser skeleton.  Alternatively, if you modify or redistribute
  // the parser skeleton itself, you may (at your option) remove this
  // special exception, which will cause the skeleton and the resulting
  // Bison output files to be licensed under the GNU General Public
  // License without this special exception.
  
  // This special exception was added by the Free Software Foundation in
  // version 2.2 of Bison.
  
  // DO NOT RELY ON FEATURES THAT ARE NOT DOCUMENTED in the manual,
  // especially those whose name start with YY_ or yy_.  They are
  // private implementation details that can be changed or removed.
  
  
  // Take the name prefix into account.
  #define yylex   evallex
  
  
  
  #include "parser.h"
  
  
  // Unqualified %code blocks.
  #line 33 "parser.yy"
  
  # include "eval_context.h"
  
  #line 52 "parser.cc"
  
  
  #ifndef YY_
  # if defined YYENABLE_NLS && YYENABLE_NLS
  #  if ENABLE_NLS
  #   include <libintl.h> // FIXME: INFRINGES ON USER NAME SPACE.
  #   define YY_(msgid) dgettext ("bison-runtime", msgid)
  #  endif
  # endif
  # ifndef YY_
  #  define YY_(msgid) msgid
  # endif
  #endif
  
  
  // Whether we are compiled with exception support.
  #ifndef YY_EXCEPTIONS
  # if defined __GNUC__ && !defined __EXCEPTIONS
  #  define YY_EXCEPTIONS 0
  # else
  #  define YY_EXCEPTIONS 1
  # endif
  #endif
  
  #define YYRHSLOC(Rhs, K) ((Rhs)[K].location)
  /* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
     If N is 0, then set CURRENT to the empty location which ends
     the previous symbol: RHS[0] (always defined).  */
  
  # ifndef YYLLOC_DEFAULT
  #  define YYLLOC_DEFAULT(Current, Rhs, N)                               \
      do                                                                  \
        if (N)                                                            \
          {                                                               \
            (Current).begin  = YYRHSLOC (Rhs, 1).begin;                   \
            (Current).end    = YYRHSLOC (Rhs, N).end;                     \
          }                                                               \
        else                                                              \
          {                                                               \
            (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end;      \
          }                                                               \
      while (false)
  # endif
  
  
  // Enable debugging if requested.
  #if EVALDEBUG
  
  // A pseudo ostream that takes yydebug_ into account.
  # define YYCDEBUG if (yydebug_) (*yycdebug_)
  
  # define YY_SYMBOL_PRINT(Title, Symbol)         \
    do {                                          \
      if (yydebug_)                               \
      {                                           \
        *yycdebug_ << Title << ' ';               \
        yy_print_ (*yycdebug_, Symbol);           \
        *yycdebug_ << '\n';                       \
      }                                           \
    } while (false)
  
  # define YY_REDUCE_PRINT(Rule)          \
    do {                                  \
      if (yydebug_)                       \
        yy_reduce_print_ (Rule);          \
    } while (false)
  
  # define YY_STACK_PRINT()               \
    do {                                  \
      if (yydebug_)                       \
        yy_stack_print_ ();                \
    } while (false)
  
  #else // !EVALDEBUG
  
  # define YYCDEBUG if (false) std::cerr
  # define YY_SYMBOL_PRINT(Title, Symbol)  YYUSE (Symbol)
  # define YY_REDUCE_PRINT(Rule)           static_cast<void> (0)
  # define YY_STACK_PRINT()                static_cast<void> (0)
  
  #endif // !EVALDEBUG
  
  #define yyerrok         (yyerrstatus_ = 0)
  #define yyclearin       (yyla.clear ())
  
  #define YYACCEPT        goto yyacceptlab
  #define YYABORT         goto yyabortlab
  #define YYERROR         goto yyerrorlab
  #define YYRECOVERING()  (!!yyerrstatus_)
  
  #line 14 "parser.yy"
  namespace isc { namespace eval {
  #line 145 "parser.cc"
  
    /// Build a parser object.
    EvalParser::EvalParser (EvalContext& ctx_yyarg)
  #if EVALDEBUG
      : yydebug_ (false),
        yycdebug_ (&std::cerr),
  #else
      :
  #endif
        ctx (ctx_yyarg)
    {}
  
    EvalParser::~EvalParser ()
    {}
  
    EvalParser::syntax_error::~syntax_error () YY_NOEXCEPT YY_NOTHROW
    {}
  
    /*---------------.
    | symbol kinds.  |
    `---------------*/
  
  
  
    // by_state.
    EvalParser::by_state::by_state () YY_NOEXCEPT
      : state (empty_state)
    {}
  
    EvalParser::by_state::by_state (const by_state& that) YY_NOEXCEPT
      : state (that.state)
    {}
  
    void
    EvalParser::by_state::clear () YY_NOEXCEPT
    {
      state = empty_state;
    }
  
    void
    EvalParser::by_state::move (by_state& that)
    {
      state = that.state;
      that.clear ();
    }
  
    EvalParser::by_state::by_state (state_type s) YY_NOEXCEPT
      : state (s)
    {}
  
    EvalParser::symbol_kind_type
    EvalParser::by_state::kind () const YY_NOEXCEPT
    {
      if (state == empty_state)
        return symbol_kind::S_YYEMPTY;
      else
        return YY_CAST (symbol_kind_type, yystos_[+state]);
    }
  
    EvalParser::stack_symbol_type::stack_symbol_type ()
    {}
  
    EvalParser::stack_symbol_type::stack_symbol_type (YY_RVREF (stack_symbol_type) that)
      : super_type (YY_MOVE (that.state), YY_MOVE (that.location))
    {
      switch (that.kind ())
      {
        case symbol_kind::S_option_repr_type: // option_repr_type
          value.YY_MOVE_OR_COPY< TokenOption::RepresentationType > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_pkt4_field: // pkt4_field
          value.YY_MOVE_OR_COPY< TokenPkt4::FieldType > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_pkt6_field: // pkt6_field
          value.YY_MOVE_OR_COPY< TokenPkt6::FieldType > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_pkt_metadata: // pkt_metadata
          value.YY_MOVE_OR_COPY< TokenPkt::MetadataType > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_relay6_field: // relay6_field
          value.YY_MOVE_OR_COPY< TokenRelay6Field::FieldType > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_nest_level: // nest_level
          value.YY_MOVE_OR_COPY< int8_t > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_STRING: // "constant string"
        case symbol_kind::S_INTEGER: // "integer"
        case symbol_kind::S_HEXSTRING: // "constant hexstring"
        case symbol_kind::S_OPTION_NAME: // "option name"
        case symbol_kind::S_IP_ADDRESS: // "ip address"
          value.YY_MOVE_OR_COPY< std::string > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_option_code: // option_code
        case symbol_kind::S_sub_option_code: // sub_option_code
          value.YY_MOVE_OR_COPY< uint16_t > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_integer_expr: // integer_expr
        case symbol_kind::S_enterprise_id: // enterprise_id
          value.YY_MOVE_OR_COPY< uint32_t > (YY_MOVE (that.value));
          break;
  
        default:
          break;
      }
  
  #if 201103L <= YY_CPLUSPLUS
      // that is emptied.
      that.state = empty_state;
  #endif
    }
  
    EvalParser::stack_symbol_type::stack_symbol_type (state_type s, YY_MOVE_REF (symbol_type) that)
      : super_type (s, YY_MOVE (that.location))
    {
      switch (that.kind ())
      {
        case symbol_kind::S_option_repr_type: // option_repr_type
          value.move< TokenOption::RepresentationType > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_pkt4_field: // pkt4_field
          value.move< TokenPkt4::FieldType > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_pkt6_field: // pkt6_field
          value.move< TokenPkt6::FieldType > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_pkt_metadata: // pkt_metadata
          value.move< TokenPkt::MetadataType > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_relay6_field: // relay6_field
          value.move< TokenRelay6Field::FieldType > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_nest_level: // nest_level
          value.move< int8_t > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_STRING: // "constant string"
        case symbol_kind::S_INTEGER: // "integer"
        case symbol_kind::S_HEXSTRING: // "constant hexstring"
        case symbol_kind::S_OPTION_NAME: // "option name"
        case symbol_kind::S_IP_ADDRESS: // "ip address"
          value.move< std::string > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_option_code: // option_code
        case symbol_kind::S_sub_option_code: // sub_option_code
          value.move< uint16_t > (YY_MOVE (that.value));
          break;
  
        case symbol_kind::S_integer_expr: // integer_expr
        case symbol_kind::S_enterprise_id: // enterprise_id
          value.move< uint32_t > (YY_MOVE (that.value));
          break;
  
        default:
          break;
      }
  
      // that is emptied.
      that.kind_ = symbol_kind::S_YYEMPTY;
    }
  
  #if YY_CPLUSPLUS < 201103L
    EvalParser::stack_symbol_type&
    EvalParser::stack_symbol_type::operator= (const stack_symbol_type& that)
    {
      state = that.state;
      switch (that.kind ())
      {
        case symbol_kind::S_option_repr_type: // option_repr_type
          value.copy< TokenOption::RepresentationType > (that.value);
          break;
  
        case symbol_kind::S_pkt4_field: // pkt4_field
          value.copy< TokenPkt4::FieldType > (that.value);
          break;
  
        case symbol_kind::S_pkt6_field: // pkt6_field
          value.copy< TokenPkt6::FieldType > (that.value);
          break;
  
        case symbol_kind::S_pkt_metadata: // pkt_metadata
          value.copy< TokenPkt::MetadataType > (that.value);
          break;
  
        case symbol_kind::S_relay6_field: // relay6_field
          value.copy< TokenRelay6Field::FieldType > (that.value);
          break;
  
        case symbol_kind::S_nest_level: // nest_level
          value.copy< int8_t > (that.value);
          break;
  
        case symbol_kind::S_STRING: // "constant string"
        case symbol_kind::S_INTEGER: // "integer"
        case symbol_kind::S_HEXSTRING: // "constant hexstring"
        case symbol_kind::S_OPTION_NAME: // "option name"
        case symbol_kind::S_IP_ADDRESS: // "ip address"
          value.copy< std::string > (that.value);
          break;
  
        case symbol_kind::S_option_code: // option_code
        case symbol_kind::S_sub_option_code: // sub_option_code
          value.copy< uint16_t > (that.value);
          break;
  
        case symbol_kind::S_integer_expr: // integer_expr
        case symbol_kind::S_enterprise_id: // enterprise_id
          value.copy< uint32_t > (that.value);
          break;
  
        default:
          break;
      }
  
      location = that.location;
      return *this;
    }
  
    EvalParser::stack_symbol_type&
    EvalParser::stack_symbol_type::operator= (stack_symbol_type& that)
    {
      state = that.state;
      switch (that.kind ())
      {
        case symbol_kind::S_option_repr_type: // option_repr_type
          value.move< TokenOption::RepresentationType > (that.value);
          break;
  
        case symbol_kind::S_pkt4_field: // pkt4_field
          value.move< TokenPkt4::FieldType > (that.value);
          break;
  
        case symbol_kind::S_pkt6_field: // pkt6_field
          value.move< TokenPkt6::FieldType > (that.value);
          break;
  
        case symbol_kind::S_pkt_metadata: // pkt_metadata
          value.move< TokenPkt::MetadataType > (that.value);
          break;
  
        case symbol_kind::S_relay6_field: // relay6_field
          value.move< TokenRelay6Field::FieldType > (that.value);
          break;
  
        case symbol_kind::S_nest_level: // nest_level
          value.move< int8_t > (that.value);
          break;
  
        case symbol_kind::S_STRING: // "constant string"
        case symbol_kind::S_INTEGER: // "integer"
        case symbol_kind::S_HEXSTRING: // "constant hexstring"
        case symbol_kind::S_OPTION_NAME: // "option name"
        case symbol_kind::S_IP_ADDRESS: // "ip address"
          value.move< std::string > (that.value);
          break;
  
        case symbol_kind::S_option_code: // option_code
        case symbol_kind::S_sub_option_code: // sub_option_code
          value.move< uint16_t > (that.value);
          break;
  
        case symbol_kind::S_integer_expr: // integer_expr
        case symbol_kind::S_enterprise_id: // enterprise_id
          value.move< uint32_t > (that.value);
          break;
  
        default:
          break;
      }
  
      location = that.location;
      // that is emptied.
      that.state = empty_state;
      return *this;
    }
  #endif
  
    template <typename Base>
    void
    EvalParser::yy_destroy_ (const char* yymsg, basic_symbol<Base>& yysym) const
    {
      if (yymsg)
        YY_SYMBOL_PRINT (yymsg, yysym);
    }
  
  #if EVALDEBUG
    template <typename Base>
    void
    EvalParser::yy_print_ (std::ostream& yyo, const basic_symbol<Base>& yysym) const
    {
      std::ostream& yyoutput = yyo;
      YYUSE (yyoutput);
      if (yysym.empty ())
        yyo << "empty symbol";
      else
        {
          symbol_kind_type yykind = yysym.kind ();
          yyo << (yykind < YYNTOKENS ? "token" : "nterm")
              << ' ' << yysym.name () << " ("
              << yysym.location << ": ";
          switch (yykind)
      {
        case symbol_kind::S_STRING: // "constant string"
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < std::string > (); }
  #line 464 "parser.cc"
          break;
  
        case symbol_kind::S_INTEGER: // "integer"
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < std::string > (); }
  #line 470 "parser.cc"
          break;
  
        case symbol_kind::S_HEXSTRING: // "constant hexstring"
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < std::string > (); }
  #line 476 "parser.cc"
          break;
  
        case symbol_kind::S_OPTION_NAME: // "option name"
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < std::string > (); }
  #line 482 "parser.cc"
          break;
  
        case symbol_kind::S_IP_ADDRESS: // "ip address"
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < std::string > (); }
  #line 488 "parser.cc"
          break;
  
        case symbol_kind::S_integer_expr: // integer_expr
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < uint32_t > (); }
  #line 494 "parser.cc"
          break;
  
        case symbol_kind::S_option_code: // option_code
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < uint16_t > (); }
  #line 500 "parser.cc"
          break;
  
        case symbol_kind::S_sub_option_code: // sub_option_code
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < uint16_t > (); }
  #line 506 "parser.cc"
          break;
  
        case symbol_kind::S_option_repr_type: // option_repr_type
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < TokenOption::RepresentationType > (); }
  #line 512 "parser.cc"
          break;
  
        case symbol_kind::S_nest_level: // nest_level
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < int8_t > (); }
  #line 518 "parser.cc"
          break;
  
        case symbol_kind::S_pkt_metadata: // pkt_metadata
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < TokenPkt::MetadataType > (); }
  #line 524 "parser.cc"
          break;
  
        case symbol_kind::S_enterprise_id: // enterprise_id
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < uint32_t > (); }
  #line 530 "parser.cc"
          break;
  
        case symbol_kind::S_pkt4_field: // pkt4_field
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < TokenPkt4::FieldType > (); }
  #line 536 "parser.cc"
          break;
  
        case symbol_kind::S_pkt6_field: // pkt6_field
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < TokenPkt6::FieldType > (); }
  #line 542 "parser.cc"
          break;
  
        case symbol_kind::S_relay6_field: // relay6_field
  #line 112 "parser.yy"
                   { yyoutput << yysym.value.template as < TokenRelay6Field::FieldType > (); }
  #line 548 "parser.cc"
          break;
  
        default:
          break;
      }
          yyo << ')';
        }
    }
  #endif
  
    void
    EvalParser::yypush_ (const char* m, YY_MOVE_REF (stack_symbol_type) sym)
    {
      if (m)
        YY_SYMBOL_PRINT (m, sym);
      yystack_.push (YY_MOVE (sym));
    }
  
    void
    EvalParser::yypush_ (const char* m, state_type s, YY_MOVE_REF (symbol_type) sym)
    {
  #if 201103L <= YY_CPLUSPLUS
      yypush_ (m, stack_symbol_type (s, std::move (sym)));
  #else
      stack_symbol_type ss (s, sym);
      yypush_ (m, ss);
  #endif
    }
  
    void
    EvalParser::yypop_ (int n)
    {
      yystack_.pop (n);
    }
  
  #if EVALDEBUG
    std::ostream&
    EvalParser::debug_stream () const
    {
      return *yycdebug_;
    }
  
    void
    EvalParser::set_debug_stream (std::ostream& o)
    {
      yycdebug_ = &o;
    }
  
  
    EvalParser::debug_level_type
    EvalParser::debug_level () const
    {
      return yydebug_;
    }
  
    void
    EvalParser::set_debug_level (debug_level_type l)
    {
      yydebug_ = l;
    }
  #endif // EVALDEBUG
  
    EvalParser::state_type
    EvalParser::yy_lr_goto_state_ (state_type yystate, int yysym)
    {
      int yyr = yypgoto_[yysym - YYNTOKENS] + yystate;
      if (0 <= yyr && yyr <= yylast_ && yycheck_[yyr] == yystate)
        return yytable_[yyr];
      else
        return yydefgoto_[yysym - YYNTOKENS];
    }
  
    bool
    EvalParser::yy_pact_value_is_default_ (int yyvalue)
    {
      return yyvalue == yypact_ninf_;
    }
  
    bool
    EvalParser::yy_table_value_is_error_ (int yyvalue)
    {
      return yyvalue == yytable_ninf_;
    }
  
    int
    EvalParser::operator() ()
    {
      return parse ();
    }
  
    int
    EvalParser::parse ()
    {
      int yyn;
      /// Length of the RHS of the rule being reduced.
      int yylen = 0;
  
      // Error handling.
      int yynerrs_ = 0;
      int yyerrstatus_ = 0;
  
      /// The lookahead symbol.
      symbol_type yyla;
  
      /// The locations where the error started and ended.
      stack_symbol_type yyerror_range[3];
  
      /// The return value of parse ().
      int yyresult;
  
  #if YY_EXCEPTIONS
      try
  #endif // YY_EXCEPTIONS
        {
      YYCDEBUG << "Starting parse\n";
  
  
      /* Initialize the stack.  The initial state will be set in
         yynewstate, since the latter expects the semantical and the
         location values to have been already stored, initialize these
         stacks with a primary value.  */
      yystack_.clear ();
      yypush_ (YY_NULLPTR, 0, YY_MOVE (yyla));
  
    /*-----------------------------------------------.
    | yynewstate -- push a new symbol on the stack.  |
    `-----------------------------------------------*/
    yynewstate:
      YYCDEBUG << "Entering state " << int (yystack_[0].state) << '\n';
      YY_STACK_PRINT ();
  
      // Accept?
      if (yystack_[0].state == yyfinal_)
        YYACCEPT;
  
      goto yybackup;
  
  
    /*-----------.
    | yybackup.  |
    `-----------*/
    yybackup:
      // Try to take a decision without lookahead.
      yyn = yypact_[+yystack_[0].state];
      if (yy_pact_value_is_default_ (yyn))
        goto yydefault;
  
      // Read a lookahead token.
      if (yyla.empty ())
        {
          YYCDEBUG << "Reading a token\n";
  #if YY_EXCEPTIONS
          try
  #endif // YY_EXCEPTIONS
            {
              symbol_type yylookahead (yylex (ctx));
              yyla.move (yylookahead);
            }
  #if YY_EXCEPTIONS
          catch (const syntax_error& yyexc)
            {
              YYCDEBUG << "Caught exception: " << yyexc.what() << '\n';
              error (yyexc);
              goto yyerrlab1;
            }
  #endif // YY_EXCEPTIONS
        }
      YY_SYMBOL_PRINT ("Next token is", yyla);
  
      if (yyla.kind () == symbol_kind::S_YYerror)
      {
        // The scanner already issued an error message, process directly
        // to error recovery.  But do not keep the error token as
        // lookahead, it is too special and may lead us to an endless
        // loop in error recovery. */
        yyla.kind_ = symbol_kind::S_YYUNDEF;
        goto yyerrlab1;
      }
  
      /* If the proper action on seeing token YYLA.TYPE is to reduce or
         to detect an error, take that action.  */
      yyn += yyla.kind ();
      if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.kind ())
        {
          goto yydefault;
        }
  
      // Reduce or error.
      yyn = yytable_[yyn];
      if (yyn <= 0)
        {
          if (yy_table_value_is_error_ (yyn))
            goto yyerrlab;
          yyn = -yyn;
          goto yyreduce;
        }
  
      // Count tokens shifted since error; after three, turn off error status.
      if (yyerrstatus_)
        --yyerrstatus_;
  
      // Shift the lookahead token.
      yypush_ ("Shifting", state_type (yyn), YY_MOVE (yyla));
      goto yynewstate;
  
  
    /*-----------------------------------------------------------.
    | yydefault -- do the default action for the current state.  |
    `-----------------------------------------------------------*/
    yydefault:
      yyn = yydefact_[+yystack_[0].state];
      if (yyn == 0)
        goto yyerrlab;
      goto yyreduce;
  
  
    /*-----------------------------.
    | yyreduce -- do a reduction.  |
    `-----------------------------*/
    yyreduce:
      yylen = yyr2_[yyn];
      {
        stack_symbol_type yylhs;
        yylhs.state = yy_lr_goto_state_ (yystack_[yylen].state, yyr1_[yyn]);
        /* Variants are always initialized to an empty instance of the
           correct type. The default '$$ = $1' action is NOT applied
           when using variants.  */
        switch (yyr1_[yyn])
      {
        case symbol_kind::S_option_repr_type: // option_repr_type
          yylhs.value.emplace< TokenOption::RepresentationType > ();
          break;
  
        case symbol_kind::S_pkt4_field: // pkt4_field
          yylhs.value.emplace< TokenPkt4::FieldType > ();
          break;
  
        case symbol_kind::S_pkt6_field: // pkt6_field
          yylhs.value.emplace< TokenPkt6::FieldType > ();
          break;
  
        case symbol_kind::S_pkt_metadata: // pkt_metadata
          yylhs.value.emplace< TokenPkt::MetadataType > ();
          break;
  
        case symbol_kind::S_relay6_field: // relay6_field
          yylhs.value.emplace< TokenRelay6Field::FieldType > ();
          break;
  
        case symbol_kind::S_nest_level: // nest_level
          yylhs.value.emplace< int8_t > ();
          break;
  
        case symbol_kind::S_STRING: // "constant string"
        case symbol_kind::S_INTEGER: // "integer"
        case symbol_kind::S_HEXSTRING: // "constant hexstring"
        case symbol_kind::S_OPTION_NAME: // "option name"
        case symbol_kind::S_IP_ADDRESS: // "ip address"
          yylhs.value.emplace< std::string > ();
          break;
  
        case symbol_kind::S_option_code: // option_code
        case symbol_kind::S_sub_option_code: // sub_option_code
          yylhs.value.emplace< uint16_t > ();
          break;
  
        case symbol_kind::S_integer_expr: // integer_expr
        case symbol_kind::S_enterprise_id: // enterprise_id
          yylhs.value.emplace< uint32_t > ();
          break;
  
        default:
          break;
      }
  
  
        // Default location.
        {
          stack_type::slice range (yystack_, yylen);
          YYLLOC_DEFAULT (yylhs.location, range, yylen);
          yyerror_range[1].location = yylhs.location;
        }
  
        // Perform the reduction.
        YY_REDUCE_PRINT (yyn);
  #if YY_EXCEPTIONS
        try
  #endif // YY_EXCEPTIONS
          {
            switch (yyn)
              {
    case 6: // bool_expr: "not" bool_expr
  #line 132 "parser.yy"
                  {
                      TokenPtr neg(new TokenNot());
                      ctx.expression.push_back(neg);
                  }
  #line 846 "parser.cc"
      break;
  
    case 7: // bool_expr: bool_expr "and" bool_expr
  #line 137 "parser.yy"
                  {
                      TokenPtr neg(new TokenAnd());
                      ctx.expression.push_back(neg);
                  }
  #line 855 "parser.cc"
      break;
  
    case 8: // bool_expr: bool_expr "or" bool_expr
  #line 142 "parser.yy"
                  {
                      TokenPtr neg(new TokenOr());
                      ctx.expression.push_back(neg);
                  }
  #line 864 "parser.cc"
      break;
  
    case 9: // bool_expr: string_expr "==" string_expr
  #line 147 "parser.yy"
                  {
                      TokenPtr eq(new TokenEqual());
                      ctx.expression.push_back(eq);
                  }
  #line 873 "parser.cc"
      break;
  
    case 10: // bool_expr: "option" "[" option_code "]" "." "exists"
  #line 152 "parser.yy"
                  {
                      TokenPtr opt(new TokenOption(yystack_[3].value.as < uint16_t > (), TokenOption::EXISTS));
                      ctx.expression.push_back(opt);
                  }
  #line 882 "parser.cc"
      break;
  
    case 11: // bool_expr: "option" "[" option_code "]" "." "option" "[" sub_option_code "]" "." "exists"
  #line 157 "parser.yy"
                  {
                      TokenPtr opt(new TokenSubOption(yystack_[8].value.as < uint16_t > (), yystack_[3].value.as < uint16_t > (), TokenOption::EXISTS));
                      ctx.expression.push_back(opt);
                  }
  #line 891 "parser.cc"
      break;
  
    case 12: // bool_expr: "relay4" "[" sub_option_code "]" "." "exists"
  #line 162 "parser.yy"
                  {
                     switch (ctx.getUniverse()) {
                     case Option::V4:
                     {
                         TokenPtr opt(new TokenRelay4Option(yystack_[3].value.as < uint16_t > (), TokenOption::EXISTS));
                         ctx.expression.push_back(opt);
                         break;
                     }
                     case Option::V6:
                         // We will have relay6[123] for the DHCPv6.
                         // In a very distant future we'll possibly be able
                         // to mix both if we have DHCPv4-over-DHCPv6, so it
                         // has some sense to make it explicit whether we
                         // talk about DHCPv4 relay or DHCPv6 relay. However,
                         // for the time being relay4 can be used in DHCPv4
                         // only.
                         error(yystack_[5].location, "relay4 can only be used in DHCPv4.");
                     }
                  }
  #line 915 "parser.cc"
      break;
  
    case 13: // bool_expr: "relay6" "[" nest_level "]" "." "option" "[" sub_option_code "]" "." "exists"
  #line 182 "parser.yy"
                  {
                      switch (ctx.getUniverse()) {
                      case Option::V6:
                      {
                          TokenPtr opt(new TokenRelay6Option(yystack_[8].value.as < int8_t > (), yystack_[3].value.as < uint16_t > (), TokenOption::EXISTS));
                          ctx.expression.push_back(opt);
                          break;
                      }
                      case Option::V4:
                          // For now we only use relay6 in DHCPv6.
                          error(yystack_[10].location, "relay6 can only be used in DHCPv6.");
                      }
                  }
  #line 933 "parser.cc"
      break;
  
    case 14: // bool_expr: "vendor-class" "[" enterprise_id "]" "." "exists"
  #line 196 "parser.yy"
                {
                    // Expression: vendor-class[1234].exists
                    //
                    // This token will find option 124 (DHCPv4) or 16 (DHCPv6),
                    // and will check if enterprise-id equals specified value.
                    TokenPtr exist(new TokenVendorClass(ctx.getUniverse(), yystack_[3].value.as < uint32_t > (), TokenOption::EXISTS));
                    ctx.expression.push_back(exist);
                }
  #line 946 "parser.cc"
      break;
  
    case 15: // bool_expr: "vendor" "[" enterprise_id "]" "." "exists"
  #line 205 "parser.yy"
                {
                    // Expression: vendor[1234].exists
                    //
                    // This token will find option 125 (DHCPv4) or 17 (DHCPv6),
                    // and will check if enterprise-id equals specified value.
                    TokenPtr exist(new TokenVendor(ctx.getUniverse(), yystack_[3].value.as < uint32_t > (), TokenOption::EXISTS));
                    ctx.expression.push_back(exist);
                }
  #line 959 "parser.cc"
      break;
  
    case 16: // bool_expr: "vendor" "[" enterprise_id "]" "." "option" "[" sub_option_code "]" "." "exists"
  #line 214 "parser.yy"
                {
                    // Expression vendor[1234].option[123].exists
                    //
                    // This token will check if specified vendor option
                    // exists, has specified enterprise-id and if has
                    // specified suboption.
                    TokenPtr exist(new TokenVendor(ctx.getUniverse(), yystack_[8].value.as < uint32_t > (), TokenOption::EXISTS, yystack_[3].value.as < uint16_t > ()));
                    ctx.expression.push_back(exist);
                 }
  #line 973 "parser.cc"
      break;
  
    case 17: // bool_expr: "member" "(" "constant string" ")"
  #line 224 "parser.yy"
                {
                    // Expression member('foo')
                    //
                    // This token will check if the packet is a member of
                    // the specified client class.
                    // To avoid loops at evaluation only already defined and
                    // built-in classes are allowed.
                    std::string cc = yystack_[1].value.as < std::string > ();
                    if (!ctx.isClientClassDefined(cc)) {
                        error(yystack_[1].location, "Not defined client class '" + cc + "'");
                    }
                    TokenPtr member(new TokenMember(cc));
                    ctx.expression.push_back(member);
                }
  #line 992 "parser.cc"
      break;
  
    case 18: // string_expr: "constant string"
  #line 241 "parser.yy"
                    {
                        TokenPtr str(new TokenString(yystack_[0].value.as < std::string > ()));
                        ctx.expression.push_back(str);
                    }
  #line 1001 "parser.cc"
      break;
  
    case 19: // string_expr: "constant hexstring"
  #line 246 "parser.yy"
                    {
                        TokenPtr hex(new TokenHexString(yystack_[0].value.as < std::string > ()));
                        ctx.expression.push_back(hex);
                    }
  #line 1010 "parser.cc"
      break;
  
    case 20: // string_expr: "ip address"
  #line 251 "parser.yy"
                    {
                        TokenPtr ip(new TokenIpAddress(yystack_[0].value.as < std::string > ()));
                        ctx.expression.push_back(ip);
                    }
  #line 1019 "parser.cc"
      break;
  
    case 21: // string_expr: "option" "[" option_code "]" "." option_repr_type
  #line 256 "parser.yy"
                    {
                        TokenPtr opt(new TokenOption(yystack_[3].value.as < uint16_t > (), yystack_[0].value.as < TokenOption::RepresentationType > ()));
                        ctx.expression.push_back(opt);
                    }
  #line 1028 "parser.cc"
      break;
  
    case 22: // string_expr: "option" "[" option_code "]" "." "option" "[" sub_option_code "]" "." option_repr_type
  #line 261 "parser.yy"
                    {
                        TokenPtr opt(new TokenSubOption(yystack_[8].value.as < uint16_t > (), yystack_[3].value.as < uint16_t > (), yystack_[0].value.as < TokenOption::RepresentationType > ()));
                        ctx.expression.push_back(opt);
                    }
  #line 1037 "parser.cc"
      break;
  
    case 23: // string_expr: "relay4" "[" sub_option_code "]" "." option_repr_type
  #line 266 "parser.yy"
                    {
                       switch (ctx.getUniverse()) {
                       case Option::V4:
                       {
                           TokenPtr opt(new TokenRelay4Option(yystack_[3].value.as < uint16_t > (), yystack_[0].value.as < TokenOption::RepresentationType > ()));
                           ctx.expression.push_back(opt);
                           break;
                       }
                       case Option::V6:
                           // We will have relay6[123] for the DHCPv6.
                           // In a very distant future we'll possibly be able
                           // to mix both if we have DHCPv4-over-DHCPv6, so it
                           // has some sense to make it explicit whether we
                           // talk about DHCPv4 relay or DHCPv6 relay. However,
                           // for the time being relay4 can be used in DHCPv4
                           // only.
                           error(yystack_[5].location, "relay4 can only be used in DHCPv4.");
                       }
                    }
  #line 1061 "parser.cc"
      break;
  
    case 24: // string_expr: "relay6" "[" nest_level "]" "." "option" "[" sub_option_code "]" "." option_repr_type
  #line 287 "parser.yy"
                    {
                       switch (ctx.getUniverse()) {
                       case Option::V6:
                       {
                           TokenPtr opt(new TokenRelay6Option(yystack_[8].value.as < int8_t > (), yystack_[3].value.as < uint16_t > (), yystack_[0].value.as < TokenOption::RepresentationType > ()));
                           ctx.expression.push_back(opt);
                           break;
                       }
                       case Option::V4:
                           // For now we only use relay6 in DHCPv6.
                           error(yystack_[10].location, "relay6 can only be used in DHCPv6.");
                       }
                    }
  #line 1079 "parser.cc"
      break;
  
    case 25: // string_expr: "pkt" "." pkt_metadata
  #line 302 "parser.yy"
                    {
                        TokenPtr pkt_metadata(new TokenPkt(yystack_[0].value.as < TokenPkt::MetadataType > ()));
                        ctx.expression.push_back(pkt_metadata);
                    }
  #line 1088 "parser.cc"
      break;
  
    case 26: // string_expr: "pkt4" "." pkt4_field
  #line 307 "parser.yy"
                    {
                       switch (ctx.getUniverse()) {
                       case Option::V4:
                       {
                           TokenPtr pkt4_field(new TokenPkt4(yystack_[0].value.as < TokenPkt4::FieldType > ()));
                           ctx.expression.push_back(pkt4_field);
                           break;
                       }
                       case Option::V6:
                           // For now we only use pkt4 in DHCPv4.
                           error(yystack_[2].location, "pkt4 can only be used in DHCPv4.");
                       }
                    }
  #line 1106 "parser.cc"
      break;
  
    case 27: // string_expr: "pkt6" "." pkt6_field
  #line 321 "parser.yy"
                    {
                       switch (ctx.getUniverse()) {
                       case Option::V6:
                       {
                           TokenPtr pkt6_field(new TokenPkt6(yystack_[0].value.as < TokenPkt6::FieldType > ()));
                           ctx.expression.push_back(pkt6_field);
                           break;
                       }
                       case Option::V4:
                           // For now we only use pkt6 in DHCPv6.
                           error(yystack_[2].location, "pkt6 can only be used in DHCPv6.");
                       }
                    }
  #line 1124 "parser.cc"
      break;
  
    case 28: // string_expr: "relay6" "[" nest_level "]" "." relay6_field
  #line 335 "parser.yy"
                    {
                       switch (ctx.getUniverse()) {
                       case Option::V6:
                       {
                           TokenPtr relay6field(new TokenRelay6Field(yystack_[3].value.as < int8_t > (), yystack_[0].value.as < TokenRelay6Field::FieldType > ()));
                           ctx.expression.push_back(relay6field);
                           break;
                       }
                       case Option::V4:
                           // For now we only use relay6 in DHCPv6.
                           error(yystack_[5].location, "relay6 can only be used in DHCPv6.");
                       }
                    }
  #line 1142 "parser.cc"
      break;
  
    case 29: // string_expr: "substring" "(" string_expr "," start_expr "," length_expr ")"
  #line 350 "parser.yy"
                    {
                        TokenPtr sub(new TokenSubstring());
                        ctx.expression.push_back(sub);
                    }
  #line 1151 "parser.cc"
      break;
  
    case 30: // string_expr: "concat" "(" string_expr "," string_expr ")"
  #line 355 "parser.yy"
                    {
                        TokenPtr conc(new TokenConcat());
                        ctx.expression.push_back(conc);
                    }
  #line 1160 "parser.cc"
      break;
  
    case 31: // string_expr: "ifelse" "(" bool_expr "," string_expr "," string_expr ")"
  #line 360 "parser.yy"
                    {
                        TokenPtr cond(new TokenIfElse());
                        ctx.expression.push_back(cond);
                    }
  #line 1169 "parser.cc"
      break;
  
    case 32: // string_expr: "hexstring" "(" string_expr "," string_expr ")"
  #line 365 "parser.yy"
                    {
                        TokenPtr tohex(new TokenToHexString());
                        ctx.expression.push_back(tohex);
                    }
  #line 1178 "parser.cc"
      break;
  
    case 33: // string_expr: "vendor" "." "enterprise"
  #line 370 "parser.yy"
                  {
                      // expression: vendor.enterprise
                      //
                      // This token will return enterprise-id number of
                      // received vendor option.
                      TokenPtr vendor(new TokenVendor(ctx.getUniverse(), 0, TokenVendor::ENTERPRISE_ID));
                      ctx.expression.push_back(vendor);
                  }
  #line 1191 "parser.cc"
      break;
  
    case 34: // string_expr: "vendor-class" "." "enterprise"
  #line 379 "parser.yy"
                  {
                      // expression: vendor-class.enterprise
                      //
                      // This token will return enterprise-id number of
                      // received vendor class option.
                      TokenPtr vendor(new TokenVendorClass(ctx.getUniverse(), 0,
                                                           TokenVendor::ENTERPRISE_ID));
                      ctx.expression.push_back(vendor);
                  }
  #line 1205 "parser.cc"
      break;
  
    case 35: // string_expr: "vendor" "[" enterprise_id "]" "." "option" "[" sub_option_code "]" "." option_repr_type
  #line 389 "parser.yy"
                  {
                      // This token will search for vendor option with
                      // specified enterprise-id.  If found, will search
                      // for specified suboption and finally will return
                      // its content.
                      TokenPtr opt(new TokenVendor(ctx.getUniverse(), yystack_[8].value.as < uint32_t > (), yystack_[0].value.as < TokenOption::RepresentationType > (), yystack_[3].value.as < uint16_t > ()));
                      ctx.expression.push_back(opt);
                  }
  #line 1218 "parser.cc"
      break;
  
    case 36: // string_expr: "vendor-class" "[" enterprise_id "]" "." "data"
  #line 398 "parser.yy"
                  {
                      // expression: vendor-class[1234].data
                      //
                      // Vendor class option does not have suboptions,
                      // but chunks of data (typically 1, but the option
                      // structure allows multiple of them). If chunk
                      // offset is not specified, we assume the first (0th)
                      // is requested.
                      TokenPtr vendor_class(new TokenVendorClass(ctx.getUniverse(), yystack_[3].value.as < uint32_t > (),
                                                                 TokenVendor::DATA, 0));
                      ctx.expression.push_back(vendor_class);
                  }
  #line 1235 "parser.cc"
      break;
  
    case 37: // string_expr: "vendor-class" "[" enterprise_id "]" "." "data" "[" "integer" "]"
  #line 411 "parser.yy"
                  {
                      // expression: vendor-class[1234].data[5]
                      //
                      // Vendor class option does not have suboptions,
                      // but chunks of data (typically 1, but the option
                      // structure allows multiple of them). This syntax
                      // specifies which data chunk (tuple) we want.
                      uint8_t index = ctx.convertUint8(yystack_[1].value.as < std::string > (), yystack_[1].location);
                      TokenPtr vendor_class(new TokenVendorClass(ctx.getUniverse(), yystack_[6].value.as < uint32_t > (),
                                                                 TokenVendor::DATA, index));
                      ctx.expression.push_back(vendor_class);
                  }
  #line 1252 "parser.cc"
      break;
  
    case 38: // string_expr: integer_expr
  #line 424 "parser.yy"
                  {
                      TokenPtr integer(new TokenInteger(yystack_[0].value.as < uint32_t > ()));
                      ctx.expression.push_back(integer);
                  }
  #line 1261 "parser.cc"
      break;
  
    case 39: // integer_expr: "integer"
  #line 431 "parser.yy"
                   {
                       yylhs.value.as < uint32_t > () = ctx.convertUint32(yystack_[0].value.as < std::string > (), yystack_[0].location);
                   }
  #line 1269 "parser.cc"
      break;
  
    case 40: // option_code: "integer"
  #line 437 "parser.yy"
                   {
                       yylhs.value.as < uint16_t > () = ctx.convertOptionCode(yystack_[0].value.as < std::string > (), yystack_[0].location);
                   }
  #line 1277 "parser.cc"
      break;
  
    case 41: // option_code: "option name"
  #line 441 "parser.yy"
                   {
                       yylhs.value.as < uint16_t > () = ctx.convertOptionName(yystack_[0].value.as < std::string > (), yystack_[0].location);
                   }
  #line 1285 "parser.cc"
      break;
  
    case 42: // sub_option_code: "integer"
  #line 447 "parser.yy"
                   {
                       yylhs.value.as < uint16_t > () = ctx.convertOptionCode(yystack_[0].value.as < std::string > (), yystack_[0].location);
                   }
  #line 1293 "parser.cc"
      break;
  
    case 43: // option_repr_type: "text"
  #line 453 "parser.yy"
                        {
                            yylhs.value.as < TokenOption::RepresentationType > () = TokenOption::TEXTUAL;
                        }
  #line 1301 "parser.cc"
      break;
  
    case 44: // option_repr_type: "hex"
  #line 457 "parser.yy"
                        {
                            yylhs.value.as < TokenOption::RepresentationType > () = TokenOption::HEXADECIMAL;
                        }
  #line 1309 "parser.cc"
      break;
  
    case 45: // nest_level: "integer"
  #line 463 "parser.yy"
                   {
                       yylhs.value.as < int8_t > () = ctx.convertNestLevelNumber(yystack_[0].value.as < std::string > (), yystack_[0].location);
                   }
  #line 1317 "parser.cc"
      break;
  
    case 46: // pkt_metadata: "iface"
  #line 472 "parser.yy"
                    {
                        yylhs.value.as < TokenPkt::MetadataType > () = TokenPkt::IFACE;
                    }
  #line 1325 "parser.cc"
      break;
  
    case 47: // pkt_metadata: "src"
  #line 476 "parser.yy"
                    {
                        yylhs.value.as < TokenPkt::MetadataType > () = TokenPkt::SRC;
                    }
  #line 1333 "parser.cc"
      break;
  
    case 48: // pkt_metadata: "dst"
  #line 480 "parser.yy"
                    {
                        yylhs.value.as < TokenPkt::MetadataType > () = TokenPkt::DST;
                    }
  #line 1341 "parser.cc"
      break;
  
    case 49: // pkt_metadata: "len"
  #line 484 "parser.yy"
                    {
                        yylhs.value.as < TokenPkt::MetadataType > () = TokenPkt::LEN;
                    }
  #line 1349 "parser.cc"
      break;
  
    case 50: // enterprise_id: "integer"
  #line 490 "parser.yy"
                     {
                         yylhs.value.as < uint32_t > () = ctx.convertUint32(yystack_[0].value.as < std::string > (), yystack_[0].location);
                     }
  #line 1357 "parser.cc"
      break;
  
    case 51: // enterprise_id: "*"
  #line 494 "parser.yy"
                     {
                         yylhs.value.as < uint32_t > () = 0;
                     }
  #line 1365 "parser.cc"
      break;
  
    case 52: // pkt4_field: "mac"
  #line 500 "parser.yy"
                  {
                      yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::CHADDR;
                  }
  #line 1373 "parser.cc"
      break;
  
    case 53: // pkt4_field: "hlen"
  #line 504 "parser.yy"
                  {
                      yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::HLEN;
                  }
  #line 1381 "parser.cc"
      break;
  
    case 54: // pkt4_field: "htype"
  #line 508 "parser.yy"
                  {
                      yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::HTYPE;
                  }
  #line 1389 "parser.cc"
      break;
  
    case 55: // pkt4_field: "ciaddr"
  #line 512 "parser.yy"
                  {
                      yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::CIADDR;
                  }
  #line 1397 "parser.cc"
      break;
  
    case 56: // pkt4_field: "giaddr"
  #line 516 "parser.yy"
                  {
                      yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::GIADDR;
                  }
  #line 1405 "parser.cc"
      break;
  
    case 57: // pkt4_field: "yiaddr"
  #line 520 "parser.yy"
                  {
                      yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::YIADDR;
                  }
  #line 1413 "parser.cc"
      break;
  
    case 58: // pkt4_field: "siaddr"
  #line 524 "parser.yy"
                  {
                      yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::SIADDR;
                  }
  #line 1421 "parser.cc"
      break;
  
    case 59: // pkt4_field: "msgtype"
  #line 528 "parser.yy"
                   {
                      yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::MSGTYPE;
                   }
  #line 1429 "parser.cc"
      break;
  
    case 60: // pkt4_field: "transid"
  #line 532 "parser.yy"
                   {
                      yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::TRANSID;
                   }
  #line 1437 "parser.cc"
      break;
  
    case 61: // pkt6_field: "msgtype"
  #line 538 "parser.yy"
                   {
                       yylhs.value.as < TokenPkt6::FieldType > () = TokenPkt6::MSGTYPE;
                   }
  #line 1445 "parser.cc"
      break;
  
    case 62: // pkt6_field: "transid"
  #line 542 "parser.yy"
                   {
                       yylhs.value.as < TokenPkt6::FieldType > () = TokenPkt6::TRANSID;
                   }
  #line 1453 "parser.cc"
      break;
  
    case 63: // relay6_field: "peeraddr"
  #line 548 "parser.yy"
                     {
                         yylhs.value.as < TokenRelay6Field::FieldType > () = TokenRelay6Field::PEERADDR;
                     }
  #line 1461 "parser.cc"
      break;
  
    case 64: // relay6_field: "linkaddr"
  #line 552 "parser.yy"
                     {
                         yylhs.value.as < TokenRelay6Field::FieldType > () = TokenRelay6Field::LINKADDR;
                     }
  #line 1469 "parser.cc"
      break;
  
    case 65: // start_expr: "integer"
  #line 558 "parser.yy"
                  {
                      TokenPtr str(new TokenString(yystack_[0].value.as < std::string > ()));
                      ctx.expression.push_back(str);
                  }
  #line 1478 "parser.cc"
      break;
  
    case 66: // length_expr: "integer"
  #line 565 "parser.yy"
                   {
                       TokenPtr str(new TokenString(yystack_[0].value.as < std::string > ()));
                       ctx.expression.push_back(str);
                   }
  #line 1487 "parser.cc"
      break;
  
    case 67: // length_expr: "all"
  #line 570 "parser.yy"
                   {
                       TokenPtr str(new TokenString("all"));
                       ctx.expression.push_back(str);
                   }
  #line 1496 "parser.cc"
      break;
  
  
  #line 1500 "parser.cc"
  
              default:
                break;
              }
          }
  #if YY_EXCEPTIONS
        catch (const syntax_error& yyexc)
          {
            YYCDEBUG << "Caught exception: " << yyexc.what() << '\n';
            error (yyexc);
            YYERROR;
          }
  #endif // YY_EXCEPTIONS
        YY_SYMBOL_PRINT ("-> $$ =", yylhs);
        yypop_ (yylen);
        yylen = 0;
  
        // Shift the result of the reduction.
        yypush_ (YY_NULLPTR, YY_MOVE (yylhs));
      }
      goto yynewstate;
  
  
    /*--------------------------------------.
    | yyerrlab -- here on detecting error.  |
    `--------------------------------------*/
    yyerrlab:
      // If not already recovering from an error, report this error.
      if (!yyerrstatus_)
        {
          ++yynerrs_;
          context yyctx (*this, yyla);
          std::string msg = yysyntax_error_ (yyctx);
          error (yyla.location, YY_MOVE (msg));
        }
  
  
      yyerror_range[1].location = yyla.location;
      if (yyerrstatus_ == 3)
        {
          /* If just tried and failed to reuse lookahead token after an
             error, discard it.  */
  
          // Return failure if at end of input.
          if (yyla.kind () == symbol_kind::S_YYEOF)
            YYABORT;
          else if (!yyla.empty ())
            {
              yy_destroy_ ("Error: discarding", yyla);
              yyla.clear ();
            }
        }
  
      // Else will try to reuse lookahead token after shifting the error token.
      goto yyerrlab1;
  
  
    /*---------------------------------------------------.
    | yyerrorlab -- error raised explicitly by YYERROR.  |
    `---------------------------------------------------*/
    yyerrorlab:
      /* Pacify compilers when the user code never invokes YYERROR and
         the label yyerrorlab therefore never appears in user code.  */
      if (false)
        YYERROR;
  
      /* Do not reclaim the symbols of the rule whose action triggered
         this YYERROR.  */
      yypop_ (yylen);
      yylen = 0;
      YY_STACK_PRINT ();
      goto yyerrlab1;
  
  
    /*-------------------------------------------------------------.
    | yyerrlab1 -- common code for both syntax error and YYERROR.  |
    `-------------------------------------------------------------*/
    yyerrlab1:
      yyerrstatus_ = 3;   // Each real token shifted decrements this.
      // Pop stack until we find a state that shifts the error token.
      for (;;)
        {
          yyn = yypact_[+yystack_[0].state];
          if (!yy_pact_value_is_default_ (yyn))
            {
              yyn += symbol_kind::S_YYerror;
              if (0 <= yyn && yyn <= yylast_
                  && yycheck_[yyn] == symbol_kind::S_YYerror)
                {
                  yyn = yytable_[yyn];
                  if (0 < yyn)
                    break;
                }
            }
  
          // Pop the current state because it cannot handle the error token.
          if (yystack_.size () == 1)
            YYABORT;
  
          yyerror_range[1].location = yystack_[0].location;
          yy_destroy_ ("Error: popping", yystack_[0]);
          yypop_ ();
          YY_STACK_PRINT ();
        }
      {
        stack_symbol_type error_token;
  
        yyerror_range[2].location = yyla.location;
        YYLLOC_DEFAULT (error_token.location, yyerror_range, 2);
  
        // Shift the error token.
        error_token.state = state_type (yyn);
        yypush_ ("Shifting", YY_MOVE (error_token));
      }
      goto yynewstate;
  
  
    /*-------------------------------------.
    | yyacceptlab -- YYACCEPT comes here.  |
    `-------------------------------------*/
    yyacceptlab:
      yyresult = 0;
      goto yyreturn;
  
  
    /*-----------------------------------.
    | yyabortlab -- YYABORT comes here.  |
    `-----------------------------------*/
    yyabortlab:
      yyresult = 1;
      goto yyreturn;
  
  
    /*-----------------------------------------------------.
    | yyreturn -- parsing is finished, return the result.  |
    `-----------------------------------------------------*/
    yyreturn:
      if (!yyla.empty ())
        yy_destroy_ ("Cleanup: discarding lookahead", yyla);
  
      /* Do not reclaim the symbols of the rule whose action triggered
         this YYABORT or YYACCEPT.  */
      yypop_ (yylen);
      YY_STACK_PRINT ();
      while (1 < yystack_.size ())
        {
          yy_destroy_ ("Cleanup: popping", yystack_[0]);
          yypop_ ();
        }
  
      return yyresult;
    }
  #if YY_EXCEPTIONS
      catch (...)
        {
          YYCDEBUG << "Exception caught: cleaning lookahead and stack\n";
          // Do not try to display the values of the reclaimed symbols,
          // as their printers might throw an exception.
          if (!yyla.empty ())
            yy_destroy_ (YY_NULLPTR, yyla);
  
          while (1 < yystack_.size ())
            {
              yy_destroy_ (YY_NULLPTR, yystack_[0]);
              yypop_ ();
            }
          throw;
        }
  #endif // YY_EXCEPTIONS
    }
  
    void
    EvalParser::error (const syntax_error& yyexc)
    {
      error (yyexc.location, yyexc.what ());
    }
  
    /* Return YYSTR after stripping away unnecessary quotes and
       backslashes, so that it's suitable for yyerror.  The heuristic is
       that double-quoting is unnecessary unless the string contains an
       apostrophe, a comma, or backslash (other than backslash-backslash).
       YYSTR is taken from yytname.  */
    std::string
    EvalParser::yytnamerr_ (const char *yystr)
    {
      if (*yystr == '"')
        {
          std::string yyr;
          char const *yyp = yystr;
  
          for (;;)
            switch (*++yyp)
              {
              case '\'':
              case ',':
                goto do_not_strip_quotes;
  
              case '\\':
                if (*++yyp != '\\')
                  goto do_not_strip_quotes;
                else
                  goto append;
  
              append:
              default:
                yyr += *yyp;
                break;
  
              case '"':
                return yyr;
              }
        do_not_strip_quotes: ;
        }
  
      return yystr;
    }
  
    std::string
    EvalParser::symbol_name (symbol_kind_type yysymbol)
    {
      return yytnamerr_ (yytname_[yysymbol]);
    }
  
  
  
    // EvalParser::context.
    EvalParser::context::context (const EvalParser& yyparser, const symbol_type& yyla)
      : yyparser_ (yyparser)
      , yyla_ (yyla)
    {}
  
    int
    EvalParser::context::expected_tokens (symbol_kind_type yyarg[], int yyargn) const
    {
      // Actual number of expected tokens
      int yycount = 0;
  
      int yyn = yypact_[+yyparser_.yystack_[0].state];
      if (!yy_pact_value_is_default_ (yyn))
        {
          /* Start YYX at -YYN if negative to avoid negative indexes in
             YYCHECK.  In other words, skip the first -YYN actions for
             this state because they are default actions.  */
          int yyxbegin = yyn < 0 ? -yyn : 0;
          // Stay within bounds of both yycheck and yytname.
          int yychecklim = yylast_ - yyn + 1;
          int yyxend = yychecklim < YYNTOKENS ? yychecklim : YYNTOKENS;
          for (int yyx = yyxbegin; yyx < yyxend; ++yyx)
            if (yycheck_[yyx + yyn] == yyx && yyx != symbol_kind::S_YYerror
                && !yy_table_value_is_error_ (yytable_[yyx + yyn]))
              {
                if (!yyarg)
                  ++yycount;
                else if (yycount == yyargn)
                  return 0;
                else
                  yyarg[yycount++] = YY_CAST (symbol_kind_type, yyx);
              }
        }
  
      if (yyarg && yycount == 0 && 0 < yyargn)
        yyarg[0] = symbol_kind::S_YYEMPTY;
      return yycount;
    }
  
  
  
    int
    EvalParser::yy_syntax_error_arguments_ (const context& yyctx,
                                                   symbol_kind_type yyarg[], int yyargn) const
    {
      /* There are many possibilities here to consider:
         - If this state is a consistent state with a default action, then
           the only way this function was invoked is if the default action
           is an error action.  In that case, don't check for expected
           tokens because there are none.
         - The only way there can be no lookahead present (in yyla) is
           if this state is a consistent state with a default action.
           Thus, detecting the absence of a lookahead is sufficient to
           determine that there is no unexpected or expected token to
           report.  In that case, just report a simple "syntax error".
         - Don't assume there isn't a lookahead just because this state is
           a consistent state with a default action.  There might have
           been a previous inconsistent state, consistent state with a
           non-default action, or user semantic action that manipulated
           yyla.  (However, yyla is currently not documented for users.)
         - Of course, the expected token list depends on states to have
           correct lookahead information, and it depends on the parser not
           to perform extra reductions after fetching a lookahead from the
           scanner and before detecting a syntax error.  Thus, state merging
           (from LALR or IELR) and default reductions corrupt the expected
           token list.  However, the list is correct for canonical LR with
           one exception: it will still contain any token that will not be
           accepted due to an error action in a later state.
      */
  
      if (!yyctx.lookahead ().empty ())
        {
          if (yyarg)
            yyarg[0] = yyctx.token ();
          int yyn = yyctx.expected_tokens (yyarg ? yyarg + 1 : yyarg, yyargn - 1);
          return yyn + 1;
        }
      return 0;
    }
  
    // Generate an error message.
    std::string
    EvalParser::yysyntax_error_ (const context& yyctx) const
    {
      // Its maximum.
      enum { YYARGS_MAX = 5 };
      // Arguments of yyformat.
      symbol_kind_type yyarg[YYARGS_MAX];
      int yycount = yy_syntax_error_arguments_ (yyctx, yyarg, YYARGS_MAX);
  
      char const* yyformat = YY_NULLPTR;
      switch (yycount)
        {
  #define YYCASE_(N, S)                         \
          case N:                               \
            yyformat = S;                       \
          break
        default: // Avoid compiler warnings.
          YYCASE_ (0, YY_("syntax error"));
          YYCASE_ (1, YY_("syntax error, unexpected %s"));
          YYCASE_ (2, YY_("syntax error, unexpected %s, expecting %s"));
          YYCASE_ (3, YY_("syntax error, unexpected %s, expecting %s or %s"));
          YYCASE_ (4, YY_("syntax error, unexpected %s, expecting %s or %s or %s"));
          YYCASE_ (5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s"));
  #undef YYCASE_
        }
  
      std::string yyres;
      // Argument number.
      std::ptrdiff_t yyi = 0;
      for (char const* yyp = yyformat; *yyp; ++yyp)
        if (yyp[0] == '%' && yyp[1] == 's' && yyi < yycount)
          {
            yyres += symbol_name (yyarg[yyi++]);
            ++yyp;
          }
        else
          yyres += *yyp;
      return yyres;
    }
  
  
    const signed char EvalParser::yypact_ninf_ = -120;
  
    const signed char EvalParser::yytable_ninf_ = -1;
  
    const short
    EvalParser::yypact_[] =
    {
       -24,    80,   116,    21,    80,    80,    -5,    24,    46,    84,
        85,    88,   118,   119,   125,   126,   121,    20,    67,  -120,
      -120,  -120,  -120,  -120,    91,   127,  -120,   124,   128,   129,
        71,    78,  -120,  -120,    56,  -120,    43,    82,    89,    86,
        34,   -15,   116,   116,    80,   116,    74,    -9,    94,    -9,
        99,    80,    80,   116,    43,    82,    89,    -9,    -9,  -120,
      -120,  -120,   131,  -120,   132,  -120,   133,   147,  -120,  -120,
      -120,  -120,  -120,  -120,  -120,  -120,  -120,  -120,  -120,  -120,
      -120,  -120,  -120,   122,   135,    -3,   136,  -120,  -120,  -120,
      -120,  -120,   141,  -120,   145,  -120,  -120,   146,  -120,   148,
       149,   153,   157,   158,   159,   160,   161,  -120,   111,   116,
       116,   116,   162,   163,   164,   165,   166,   167,   168,    10,
        52,    35,  -120,   139,   182,   151,   184,   -12,     0,    13,
        81,    41,   117,   180,   175,  -120,  -120,  -120,  -120,  -120,
      -120,   176,  -120,  -120,  -120,   -28,  -120,   116,  -120,  -120,
       177,   178,  -120,   179,   181,   183,    82,    82,  -120,  -120,
       191,   193,   150,    82,    82,    82,    82,   186,   187,  -120,
      -120,   188,   189,   190,   192,   194,   195,   196,  -120,   197,
       198,   199,   200,    55,    58,    61,    81,    81,    81,  -120,
      -120,  -120,  -120,  -120,  -120
    };
  
    const signed char
    EvalParser::yydefact_[] =
    {
         0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
         0,     0,     0,     0,     0,     0,     0,     0,     0,    18,
        39,    19,    20,     2,     4,     0,    38,     0,     0,     0,
         0,     0,     3,     1,     0,     6,     0,     0,     0,     0,
         0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
         0,     0,     0,     0,     0,     0,     0,     0,     0,     5,
        40,    41,     0,    42,     0,    45,     0,     0,    46,    47,
        48,    49,    25,    52,    53,    54,    55,    56,    57,    58,
        59,    60,    26,     0,     0,     0,     0,    61,    62,    27,
        51,    50,     0,    34,     0,    33,     7,     8,     9,     0,
         0,     0,     0,     0,     0,     0,     0,    17,     0,     0,
         0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
         0,     0,    65,     0,     0,     0,     0,     0,     0,     0,
         0,     0,     0,     0,     0,    43,    44,    10,    21,    12,
        23,     0,    63,    64,    28,     0,    30,     0,    32,    14,
        36,     0,    15,     0,     0,     0,     0,     0,    67,    66,
         0,     0,     0,     0,     0,     0,     0,     0,     0,    29,
        31,     0,     0,     0,     0,     0,     0,     0,    37,     0,
         0,     0,     0,     0,     0,     0,     0,     0,     0,    11,
        22,    13,    24,    16,    35
    };
  
    const short
    EvalParser::yypgoto_[] =
    {
      -120,  -120,  -120,     1,    -2,  -120,   155,   -53,  -119,   143,
      -120,   -11,  -120,  -120,  -120,  -120,  -120
    };
  
    const short
    EvalParser::yydefgoto_[] =
    {
        -1,     3,    23,    24,    25,    26,    62,    64,   138,    66,
        72,    92,    82,    89,   144,   123,   160
    };
  
    const unsigned char
    EvalParser::yytable_[] =
    {
        32,   140,   100,    51,    52,    34,    35,   158,   149,   151,
        36,   140,    73,    74,    75,    76,    77,    78,    79,   134,
       152,    33,   153,   159,     1,     2,    80,    81,   135,   136,
       137,   135,   136,   110,   150,    47,    90,    48,    94,    37,
        83,    84,    91,    86,   141,    85,   102,   103,   142,   143,
       154,    98,    96,    97,   142,   143,    68,    69,    70,    71,
        59,    38,    51,    52,   190,   192,   194,   190,   192,   194,
       135,   136,   139,   135,   136,   189,   135,   136,   191,   135,
       136,   193,    49,     4,    50,     5,    57,    39,    48,     6,
         7,     8,     9,    58,    60,    50,    61,    51,    52,   135,
       136,    10,    40,   167,   168,    41,    11,   124,   125,   126,
       172,   173,   174,   175,    12,    87,    88,    13,    14,    15,
        16,    42,    43,    17,    18,    27,    28,    29,    44,    45,
        19,    20,    21,    63,    22,    53,    67,    10,    46,    54,
        65,    93,    11,    55,    56,   161,    95,   104,   105,   106,
        12,   107,    51,    13,    14,    15,    16,   112,   108,    30,
        31,   113,   122,   150,   114,   115,    19,    20,    21,   116,
        22,   109,   111,   117,   118,   145,   119,   120,   121,   127,
       128,   129,   130,   131,   132,   133,   146,   147,   148,   155,
       156,   157,   162,   163,   164,   169,   165,   170,   166,   101,
         0,   171,   176,   177,   178,   179,   180,     0,   181,    99,
       182,     0,   183,   184,   185,   186,   187,   188
    };
  
    const short
    EvalParser::yycheck_[] =
    {
         2,   120,    55,     6,     7,     4,     5,    35,    20,     9,
        15,   130,    27,    28,    29,    30,    31,    32,    33,     9,
        20,     0,     9,    51,    48,    49,    41,    42,    18,    19,
        20,    18,    19,    36,    46,    15,    45,    17,    49,    15,
        42,    43,    51,    45,     9,    44,    57,    58,    13,    14,
         9,    53,    51,    52,    13,    14,    22,    23,    24,    25,
         4,    15,     6,     7,   183,   184,   185,   186,   187,   188,
        18,    19,    20,    18,    19,    20,    18,    19,    20,    18,
        19,    20,    15,     3,    17,     5,    15,     3,    17,     9,
        10,    11,    12,    15,    51,    17,    53,     6,     7,    18,
        19,    21,    17,   156,   157,    17,    26,   109,   110,   111,
       163,   164,   165,   166,    34,    41,    42,    37,    38,    39,
        40,     3,     3,    43,    44,     9,    10,    11,     3,     3,
        50,    51,    52,    51,    54,     8,    50,    21,    17,    15,
        51,    47,    26,    15,    15,   147,    47,    16,    16,    16,
        34,     4,     6,    37,    38,    39,    40,    16,    36,    43,
        44,    16,    51,    46,    16,    16,    50,    51,    52,    16,
        54,    36,    36,    16,    16,    36,    17,    17,    17,    17,
        17,    17,    17,    17,    17,    17,     4,    36,     4,     9,
        15,    15,    15,    15,    15,     4,    15,     4,    15,    56,
        -1,    51,    16,    16,    16,    16,    16,    -1,    16,    54,
        16,    -1,    17,    17,    17,    17,    17,    17
    };
  
    const signed char
    EvalParser::yystos_[] =
    {
         0,    48,    49,    56,     3,     5,     9,    10,    11,    12,
        21,    26,    34,    37,    38,    39,    40,    43,    44,    50,
        51,    52,    54,    57,    58,    59,    60,     9,    10,    11,
        43,    44,    59,     0,    58,    58,    15,    15,    15,     3,
        17,    17,     3,     3,     3,     3,    17,    15,    17,    15,
        17,     6,     7,     8,    15,    15,    15,    15,    15,     4,
        51,    53,    61,    51,    62,    51,    64,    50,    22,    23,
        24,    25,    65,    27,    28,    29,    30,    31,    32,    33,
        41,    42,    67,    59,    59,    58,    59,    41,    42,    68,
        45,    51,    66,    47,    66,    47,    58,    58,    59,    61,
        62,    64,    66,    66,    16,    16,    16,     4,    36,    36,
        36,    36,    16,    16,    16,    16,    16,    16,    16,    17,
        17,    17,    51,    70,    59,    59,    59,    17,    17,    17,
        17,    17,    17,    17,     9,    18,    19,    20,    63,    20,
        63,     9,    13,    14,    69,    36,     4,    36,     4,    20,
        46,     9,    20,     9,     9,     9,    15,    15,    35,    51,
        71,    59,    15,    15,    15,    15,    15,    62,    62,     4,
         4,    51,    62,    62,    62,    62,    16,    16,    16,    16,
        16,    16,    16,    17,    17,    17,    17,    17,    17,    20,
        63,    20,    63,    20,    63
    };
  
    const signed char
    EvalParser::yyr1_[] =
    {
         0,    55,    56,    56,    57,    58,    58,    58,    58,    58,
        58,    58,    58,    58,    58,    58,    58,    58,    59,    59,
        59,    59,    59,    59,    59,    59,    59,    59,    59,    59,
        59,    59,    59,    59,    59,    59,    59,    59,    59,    60,
        61,    61,    62,    63,    63,    64,    65,    65,    65,    65,
        66,    66,    67,    67,    67,    67,    67,    67,    67,    67,
        67,    68,    68,    69,    69,    70,    71,    71
    };
  
    const signed char
    EvalParser::yyr2_[] =
    {
         0,     2,     2,     2,     1,     3,     2,     3,     3,     3,
         6,    11,     6,    11,     6,     6,    11,     4,     1,     1,
         1,     6,    11,     6,    11,     3,     3,     3,     6,     8,
         6,     8,     6,     3,     3,    11,     6,     9,     1,     1,
         1,     1,     1,     1,     1,     1,     1,     1,     1,     1,
         1,     1,     1,     1,     1,     1,     1,     1,     1,     1,
         1,     1,     1,     1,     1,     1,     1,     1
    };
  
  
  #if EVALDEBUG || 1
    // YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
    // First, the terminals, then, starting at \a YYNTOKENS, nonterminals.
    const char*
    const EvalParser::yytname_[] =
    {
    "\"end of file\"", "error", "\"invalid token\"", "\"(\"", "\")\"",
    "\"not\"", "\"and\"", "\"or\"", "\"==\"", "\"option\"", "\"relay4\"",
    "\"relay6\"", "\"member\"", "\"peeraddr\"", "\"linkaddr\"", "\"[\"",
    "\"]\"", "\".\"", "\"text\"", "\"hex\"", "\"exists\"", "\"pkt\"",
    "\"iface\"", "\"src\"", "\"dst\"", "\"len\"", "\"pkt4\"", "\"mac\"",
    "\"hlen\"", "\"htype\"", "\"ciaddr\"", "\"giaddr\"", "\"yiaddr\"",
    "\"siaddr\"", "\"substring\"", "\"all\"", "\",\"", "\"concat\"",
    "\"ifelse\"", "\"hexstring\"", "\"pkt6\"", "\"msgtype\"", "\"transid\"",
    "\"vendor-class\"", "\"vendor\"", "\"*\"", "\"data\"", "\"enterprise\"",
    "\"top-level bool\"", "\"top-level string\"", "\"constant string\"",
    "\"integer\"", "\"constant hexstring\"", "\"option name\"",
    "\"ip address\"", "$accept", "start", "expression", "bool_expr",
    "string_expr", "integer_expr", "option_code", "sub_option_code",
    "option_repr_type", "nest_level", "pkt_metadata", "enterprise_id",
    "pkt4_field", "pkt6_field", "relay6_field", "start_expr", "length_expr", YY_NULLPTR
    };
  #endif
  
  
  #if EVALDEBUG
    const short
    EvalParser::yyrline_[] =
    {
         0,   121,   121,   122,   127,   130,   131,   136,   141,   146,
       151,   156,   161,   181,   195,   204,   213,   223,   240,   245,
       250,   255,   260,   265,   286,   301,   306,   320,   334,   349,
       354,   359,   364,   369,   378,   388,   397,   410,   423,   430,
       436,   440,   446,   452,   456,   462,   471,   475,   479,   483,
       489,   493,   499,   503,   507,   511,   515,   519,   523,   527,
       531,   537,   541,   547,   551,   557,   564,   569
    };
  
    void
    EvalParser::yy_stack_print_ () const
    {
      *yycdebug_ << "Stack now";
      for (stack_type::const_iterator
             i = yystack_.begin (),
             i_end = yystack_.end ();
           i != i_end; ++i)
        *yycdebug_ << ' ' << int (i->state);
      *yycdebug_ << '\n';
    }
  
    void
    EvalParser::yy_reduce_print_ (int yyrule) const
    {
      int yylno = yyrline_[yyrule];
      int yynrhs = yyr2_[yyrule];
      // Print the symbols being reduced, and their result.
      *yycdebug_ << "Reducing stack by rule " << yyrule - 1
                 << " (line " << yylno << "):\n";
      // The symbols being reduced.
      for (int yyi = 0; yyi < yynrhs; yyi++)
        YY_SYMBOL_PRINT ("   $" << yyi + 1 << " =",
                         yystack_[(yynrhs) - (yyi + 1)]);
    }
  #endif // EVALDEBUG
  
  
  #line 14 "parser.yy"
  } } // isc::eval
  #line 2089 "parser.cc"
  
  #line 576 "parser.yy"
  
  void
  isc::eval::EvalParser::error(const location_type& loc,
                               const std::string& what)
  {
      ctx.error(loc, what);
  }
  