// A Bison parser, made by GNU Bison 3.0.1.

// Skeleton interface for Bison LALR(1) parsers in C++

// Copyright (C) 2002-2013 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.

/**
 ** \file ../../lib/vcsn/dot/parse.hh
 ** Define the vcsn::detail::dot::parser class.
 */

// C++ LALR(1) parser skeleton written by Akim Demaille.

#ifndef YY_YY_LIB_VCSN_DOT_PARSE_HH_INCLUDED
# define YY_YY_LIB_VCSN_DOT_PARSE_HH_INCLUDED
// //                    "%code requires" blocks.
#line 15 "../../lib/vcsn/dot/parse.yy" // lalr1.cc:372

  #include <iostream>
  #include <string>

  #include <boost/flyweight.hpp>
  #include <boost/flyweight/no_tracking.hpp>
  #include <lib/vcsn/rat/location.hh>
  #include <lib/vcsn/dot/driver.hh>

  namespace vcsn
  {
    namespace detail
    {
      namespace dot
      {
        // (Complex) objects such as shared_ptr cannot be put in a
        // union, even in C++11.  So cheat, and store a struct instead
        // of an union.  See lib/vcsn/rat/README.txt.
        struct sem_type
        {
          // Identifiers (attributes and node names).
          //
          // With ref_counting I have a 20% penalty compared to using
          // std::string.  With no_tracking, I get a 10x speed up (e.g.,
          // vcsn-cat of a determinized ladybird).  But then we leak.
          // We should try to have an arena in which the flyweight
          // performs its allocation, and flush the whole arena once
          // we're done parsing.
          using string_t =
            boost::flyweight<std::string, boost::flyweights::no_tracking>;
          string_t string;
          // A set of states.
          using states_t = std::vector<string_t>;
          states_t states;
          // (Unlabeled) transitions.
          using transitions_t = std::vector<std::pair<string_t, string_t>>;
          transitions_t transitions;
        };
      }
    }
  }
#define YYSTYPE vcsn::detail::dot::sem_type

#line 88 "../../lib/vcsn/dot/parse.hh" // lalr1.cc:372


# include <vector>
# include <iostream>
# include <stdexcept>
# include <string>
# include "stack.hh"



#ifndef YY_ATTRIBUTE
# if (defined __GNUC__                                               \
      && (2 < __GNUC__ || (__GNUC__ == 2 && 96 <= __GNUC_MINOR__)))  \
     || defined __SUNPRO_C && 0x5110 <= __SUNPRO_C
#  define YY_ATTRIBUTE(Spec) __attribute__(Spec)
# else
#  define YY_ATTRIBUTE(Spec) /* empty */
# endif
#endif

#ifndef YY_ATTRIBUTE_PURE
# define YY_ATTRIBUTE_PURE   YY_ATTRIBUTE ((__pure__))
#endif

#ifndef YY_ATTRIBUTE_UNUSED
# define YY_ATTRIBUTE_UNUSED YY_ATTRIBUTE ((__unused__))
#endif

#if !defined _Noreturn \
     && (!defined __STDC_VERSION__ || __STDC_VERSION__ < 201112)
# if defined _MSC_VER && 1200 <= _MSC_VER
#  define _Noreturn __declspec (noreturn)
# else
#  define _Noreturn YY_ATTRIBUTE ((__noreturn__))
# endif
#endif

/* Suppress unused-variable warnings by "using" E.  */
#if ! defined lint || defined __GNUC__
# define YYUSE(E) ((void) (E))
#else
# define YYUSE(E) /* empty */
#endif

#if defined __GNUC__ && 407 <= __GNUC__ * 100 + __GNUC_MINOR__
/* Suppress an incorrect diagnostic about yylval being uninitialized.  */
# define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN \
    _Pragma ("GCC diagnostic push") \
    _Pragma ("GCC diagnostic ignored \"-Wuninitialized\"")\
    _Pragma ("GCC diagnostic ignored \"-Wmaybe-uninitialized\"")
# define YY_IGNORE_MAYBE_UNINITIALIZED_END \
    _Pragma ("GCC diagnostic pop")
#else
# define YY_INITIAL_VALUE(Value) Value
#endif
#ifndef YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
# define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
# define YY_IGNORE_MAYBE_UNINITIALIZED_END
#endif
#ifndef YY_INITIAL_VALUE
# define YY_INITIAL_VALUE(Value) /* Nothing. */
#endif

/* Debug traces.  */
#ifndef YYDEBUG
# define YYDEBUG 1
#endif

#line 11 "../../lib/vcsn/dot/parse.yy" // lalr1.cc:372
namespace vcsn { namespace detail { namespace dot {
#line 159 "../../lib/vcsn/dot/parse.hh" // lalr1.cc:372





  /// A Bison parser.
  class parser
  {
  public:
#ifndef YYSTYPE
    /// Symbol semantic values.

#else
    typedef YYSTYPE semantic_type;
#endif
    /// Symbol locations.
    typedef vcsn::rat::location location_type;

    /// Syntax errors thrown from user actions.
    struct syntax_error : std::runtime_error
    {
      syntax_error (const location_type& l, const std::string& m);
      location_type location;
    };

    /// Tokens.
    struct token
    {
      enum yytokentype
      {
        DIGRAPH = 258,
        EDGE = 259,
        GRAPH = 260,
        NODE = 261,
        LBRACE = 262,
        RBRACE = 263,
        LBRACKET = 264,
        RBRACKET = 265,
        EQ = 266,
        ARROW = 267,
        COMMA = 268,
        SEMI = 269,
        ID = 270
      };
    };

    /// (External) token type, as returned by yylex.
    typedef token::yytokentype token_type;

    /// Internal symbol number.
    typedef int symbol_number_type;

    /// Internal symbol number for tokens (subsumed by symbol_number_type).
    typedef unsigned char token_number_type;

    /// A complete symbol.
    ///
    /// Expects its Base type to provide access to the symbol type
    /// via type_get().
    ///
    /// Provide access to semantic value and location.
    template <typename Base>
    struct basic_symbol : Base
    {
      /// Alias to Base.
      typedef Base super_type;

      /// Default constructor.
      basic_symbol ();

      /// Copy constructor.
      basic_symbol (const basic_symbol& other);

      /// Constructor for valueless symbols.
      basic_symbol (typename Base::kind_type t,
                    const location_type& l);

      /// Constructor for symbols with semantic value.
      basic_symbol (typename Base::kind_type t,
                    const semantic_type& v,
                    const location_type& l);

      ~basic_symbol ();

      /// Destructive move, \a s is emptied into this.
      void move (basic_symbol& s);

      /// The semantic value.
      semantic_type value;

      /// The location.
      location_type location;

    private:
      /// Assignment operator.
      basic_symbol& operator= (const basic_symbol& other);
    };

    /// Type access provider for token (enum) based symbols.
    struct by_type
    {
      /// Default constructor.
      by_type ();

      /// Copy constructor.
      by_type (const by_type& other);

      /// The symbol type as needed by the constructor.
      typedef token_type kind_type;

      /// Constructor from (external) token numbers.
      by_type (kind_type t);

      /// Steal the symbol type from \a that.
      void move (by_type& that);

      /// The (internal) type number (corresponding to \a type).
      /// -1 when this symbol is empty.
      symbol_number_type type_get () const;

      /// The token.
      token_type token () const;

      enum { empty = 0 };

      /// The symbol type.
      /// -1 when this symbol is empty.
      token_number_type type;
    };

    /// "External" symbols: returned by the scanner.
    typedef basic_symbol<by_type> symbol_type;


    /// Build a parser object.
    parser (driver& driver__yyarg);
    virtual ~parser ();

    /// Parse.
    /// \returns  0 iff parsing succeeded.
    virtual int parse ();

#if YYDEBUG
    /// The current debugging stream.
    std::ostream& debug_stream () const YY_ATTRIBUTE_PURE;
    /// Set the current debugging stream.
    void set_debug_stream (std::ostream &);

    /// Type for debugging levels.
    typedef int debug_level_type;
    /// The current debugging level.
    debug_level_type debug_level () const YY_ATTRIBUTE_PURE;
    /// Set the current debugging level.
    void set_debug_level (debug_level_type l);
#endif

    /// Report a syntax error.
    /// \param loc    where the syntax error is found.
    /// \param msg    a description of the syntax error.
    virtual void error (const location_type& loc, const std::string& msg);

    /// Report a syntax error.
    void error (const syntax_error& err);

  private:
    /// This class is not copyable.
    parser (const parser&);
    parser& operator= (const parser&);

    /// State numbers.
    typedef int state_type;

    /// Generate an error message.
    /// \param yystate   the state where the error occurred.
    /// \param yytoken   the lookahead token type, or yyempty_.
    virtual std::string yysyntax_error_ (state_type yystate,
                                         symbol_number_type yytoken) const;

    /// Compute post-reduction state.
    /// \param yystate   the current state
    /// \param yylhs     the nonterminal to push on the stack
    state_type yy_lr_goto_state_ (state_type yystate, int yylhs);

    /// Whether the given \c yypact_ value indicates a defaulted state.
    /// \param yyvalue   the value to check
    static bool yy_pact_value_is_default_ (int yyvalue);

    /// Whether the given \c yytable_ value indicates a syntax error.
    /// \param yyvalue   the value to check
    static bool yy_table_value_is_error_ (int yyvalue);

    static const signed char yypact_ninf_;
    static const signed char yytable_ninf_;

    /// Convert a scanner token number \a t to a symbol number.
    static token_number_type yytranslate_ (int t);

    // Tables.
  // YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
  // STATE-NUM.
  static const signed char yypact_[];

  // YYDEFACT[STATE-NUM] -- Default reduction number in state STATE-NUM.
  // Performed when YYTABLE does not specify something else to do.  Zero
  // means the default is an error.
  static const unsigned char yydefact_[];

  // YYPGOTO[NTERM-NUM].
  static const signed char yypgoto_[];

  // YYDEFGOTO[NTERM-NUM].
  static const signed char yydefgoto_[];

  // YYTABLE[YYPACT[STATE-NUM]] -- What to do in state STATE-NUM.  If
  // positive, shift that token.  If negative, reduce the rule whose
  // number is the opposite.  If YYTABLE_NINF, syntax error.
  static const signed char yytable_[];

  static const signed char yycheck_[];

  // YYSTOS[STATE-NUM] -- The (internal number of the) accessing
  // symbol of state STATE-NUM.
  static const unsigned char yystos_[];

  // YYR1[YYN] -- Symbol number of symbol that rule YYN derives.
  static const unsigned char yyr1_[];

  // YYR2[YYN] -- Number of symbols on the right hand side of rule YYN.
  static const unsigned char yyr2_[];


    /// Convert the symbol name \a n to a form suitable for a diagnostic.
    static std::string yytnamerr_ (const char *n);


    /// For a symbol, its name in clear.
    static const char* const yytname_[];
#if YYDEBUG
  // YYRLINE[YYN] -- Source line where rule number YYN was defined.
  static const unsigned short int yyrline_[];
    /// Report on the debug stream that the rule \a r is going to be reduced.
    virtual void yy_reduce_print_ (int r);
    /// Print the state stack on the debug stream.
    virtual void yystack_print_ ();

    // Debugging.
    int yydebug_;
    std::ostream* yycdebug_;

    /// \brief Display a symbol type, value and location.
    /// \param yyo    The output stream.
    /// \param yysym  The symbol.
    template <typename Base>
    void yy_print_ (std::ostream& yyo, const basic_symbol<Base>& yysym) const;
#endif

    /// \brief Reclaim the memory associated to a symbol.
    /// \param yymsg     Why this token is reclaimed.
    ///                  If null, print nothing.
    /// \param yysym     The symbol.
    template <typename Base>
    void yy_destroy_ (const char* yymsg, basic_symbol<Base>& yysym) const;

  private:
    /// Type access provider for state based symbols.
    struct by_state
    {
      /// Default constructor.
      by_state ();

      /// The symbol type as needed by the constructor.
      typedef state_type kind_type;

      /// Constructor.
      by_state (kind_type s);

      /// Copy constructor.
      by_state (const by_state& other);

      /// Steal the symbol type from \a that.
      void move (by_state& that);

      /// The (internal) type number (corresponding to \a state).
      /// "empty" when empty.
      symbol_number_type type_get () const;

      enum { empty = 0 };

      /// The state.
      state_type state;
    };

    /// "Internal" symbol: element of the stack.
    struct stack_symbol_type : basic_symbol<by_state>
    {
      /// Superclass.
      typedef basic_symbol<by_state> super_type;
      /// Construct an empty symbol.
      stack_symbol_type ();
      /// Steal the contents from \a sym to build this.
      stack_symbol_type (state_type s, symbol_type& sym);
      /// Assignment, needed by push_back.
      stack_symbol_type& operator= (const stack_symbol_type& that);
    };

    /// Stack type.
    typedef stack<stack_symbol_type> stack_type;

    /// The stack.
    stack_type yystack_;

    /// Push a new state on the stack.
    /// \param m    a debug message to display
    ///             if null, no trace is output.
    /// \param s    the symbol
    /// \warning the contents of \a s.value is stolen.
    void yypush_ (const char* m, stack_symbol_type& s);

    /// Push a new look ahead token on the state on the stack.
    /// \param m    a debug message to display
    ///             if null, no trace is output.
    /// \param s    the state
    /// \param sym  the symbol (for its value and location).
    /// \warning the contents of \a s.value is stolen.
    void yypush_ (const char* m, state_type s, symbol_type& sym);

    /// Pop \a n symbols the three stacks.
    void yypop_ (unsigned int n = 1);

    // Constants.
    enum
    {
      yyeof_ = 0,
      yylast_ = 60,     ///< Last index in yytable_.
      yynnts_ = 20,  ///< Number of nonterminal symbols.
      yyempty_ = -2,
      yyfinal_ = 5, ///< Termination state number.
      yyterror_ = 1,
      yyerrcode_ = 256,
      yyntokens_ = 17  ///< Number of tokens.
    };


    // User arguments.
    driver& driver_;
  };


#line 11 "../../lib/vcsn/dot/parse.yy" // lalr1.cc:372
} } } // vcsn::detail::dot
#line 510 "../../lib/vcsn/dot/parse.hh" // lalr1.cc:372


// //                    "%code provides" blocks.
#line 60 "../../lib/vcsn/dot/parse.yy" // lalr1.cc:372

  #define YY_DECL_(Class)                               \
    int Class lex(parser::semantic_type* yylval,        \
                  parser::location_type* yylloc,        \
                  driver& driver_)
  #define YY_DECL YY_DECL_(yyFlexLexer::)

#line 522 "../../lib/vcsn/dot/parse.hh" // lalr1.cc:372


#endif // !YY_YY_LIB_VCSN_DOT_PARSE_HH_INCLUDED
