kc3-lang/angle/src/compiler/preprocessor/new/ExpressionParser.cpp

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• Hash : 2e81891c
  Author :
  Date : 2012-06-29T21:26:03
  

  Handled the case where int and float are of correct format, but large. The GLSL spec is not very clear on how integers should be interpreted for expressions. C99 says the expression is of type intmax_t. I am parsing all integers as int except those in expressions, which are being parsed as unsigned int.
  Review URL: https://codereview.appspot.com/6351051
  
  git-svn-id: https://angleproject.googlecode.com/svn/trunk@1179 736b8ea6-26fd-11df-bfd4-992fa37f6226
  

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• src/compiler/preprocessor/new/ExpressionParser.cpp

• /* A Bison parser, made by GNU Bison 2.4.2.  */
  
  /* Skeleton implementation for Bison's Yacc-like parsers in C
     
        Copyright (C) 1984, 1989-1990, 2000-2006, 2009-2010 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.  */
  
  /* C LALR(1) parser skeleton written by Richard Stallman, by
     simplifying the original so-called "semantic" parser.  */
  
  /* All symbols defined below should begin with yy or YY, to avoid
     infringing on user name space.  This should be done even for local
     variables, as they might otherwise be expanded by user macros.
     There are some unavoidable exceptions within include files to
     define necessary library symbols; they are noted "INFRINGES ON
     USER NAME SPACE" below.  */
  
  /* Identify Bison output.  */
  #define YYBISON 1
  
  /* Bison version.  */
  #define YYBISON_VERSION "2.4.2"
  
  /* Skeleton name.  */
  #define YYSKELETON_NAME "yacc.c"
  
  /* Pure parsers.  */
  #define YYPURE 1
  
  /* Push parsers.  */
  #define YYPUSH 0
  
  /* Pull parsers.  */
  #define YYPULL 1
  
  /* Using locations.  */
  #define YYLSP_NEEDED 0
  
  /* Substitute the variable and function names.  */
  #define yyparse         ppparse
  #define yylex           pplex
  #define yyerror         pperror
  #define yylval          pplval
  #define yychar          ppchar
  #define yydebug         ppdebug
  #define yynerrs         ppnerrs
  
  
  /* Copy the first part of user declarations.  */
  
  
  //
  // Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // This file is auto-generated by generate_parser.sh. DO NOT EDIT!
  
  #if defined(__GNUC__)
  // Triggered by the auto-generated pplval variable.
  #pragma GCC diagnostic ignored "-Wuninitialized"
  #elif defined(_MSC_VER)
  #pragma warning(disable: 4065 4701)
  #endif
  
  #include "ExpressionParser.h"
  
  #include <cassert>
  #include <sstream>
  
  #include "Diagnostics.h"
  #include "Lexer.h"
  #include "Token.h"
  
  #if defined(_MSC_VER)
  typedef __int64 YYSTYPE;
  #else
  #include <stdint.h>
  typedef intmax_t YYSTYPE;
  #endif  // _MSC_VER
  #define YYSTYPE_IS_TRIVIAL 1
  #define YYSTYPE_IS_DECLARED 1
  
  namespace {
  struct Context
  {
      pp::Diagnostics* diagnostics;
      pp::Lexer* lexer;
      pp::Token* token;
      int* result;
  };
  }  // namespace
  
  
  static int yylex(YYSTYPE* lvalp, Context* context);
  static void yyerror(Context* context, const char* reason);
  
  
  
  /* Enabling traces.  */
  #ifndef YYDEBUG
  # define YYDEBUG 0
  #endif
  
  /* Enabling verbose error messages.  */
  #ifdef YYERROR_VERBOSE
  # undef YYERROR_VERBOSE
  # define YYERROR_VERBOSE 1
  #else
  # define YYERROR_VERBOSE 0
  #endif
  
  /* Enabling the token table.  */
  #ifndef YYTOKEN_TABLE
  # define YYTOKEN_TABLE 0
  #endif
  
  
  /* Tokens.  */
  #ifndef YYTOKENTYPE
  # define YYTOKENTYPE
     /* Put the tokens into the symbol table, so that GDB and other debuggers
        know about them.  */
     enum yytokentype {
       CONST_INT = 258,
       OP_OR = 259,
       OP_AND = 260,
       OP_NE = 261,
       OP_EQ = 262,
       OP_GE = 263,
       OP_LE = 264,
       OP_RIGHT = 265,
       OP_LEFT = 266,
       UNARY = 267
     };
  #endif
  
  
  
  #if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
  typedef int YYSTYPE;
  # define YYSTYPE_IS_TRIVIAL 1
  # define yystype YYSTYPE /* obsolescent; will be withdrawn */
  # define YYSTYPE_IS_DECLARED 1
  #endif
  
  
  /* Copy the second part of user declarations.  */
  
  
  
  #ifdef short
  # undef short
  #endif
  
  #ifdef YYTYPE_UINT8
  typedef YYTYPE_UINT8 yytype_uint8;
  #else
  typedef unsigned char yytype_uint8;
  #endif
  
  #ifdef YYTYPE_INT8
  typedef YYTYPE_INT8 yytype_int8;
  #elif (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  typedef signed char yytype_int8;
  #else
  typedef short int yytype_int8;
  #endif
  
  #ifdef YYTYPE_UINT16
  typedef YYTYPE_UINT16 yytype_uint16;
  #else
  typedef unsigned short int yytype_uint16;
  #endif
  
  #ifdef YYTYPE_INT16
  typedef YYTYPE_INT16 yytype_int16;
  #else
  typedef short int yytype_int16;
  #endif
  
  #ifndef YYSIZE_T
  # ifdef __SIZE_TYPE__
  #  define YYSIZE_T __SIZE_TYPE__
  # elif defined size_t
  #  define YYSIZE_T size_t
  # elif ! defined YYSIZE_T && (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  #  include <stddef.h> /* INFRINGES ON USER NAME SPACE */
  #  define YYSIZE_T size_t
  # else
  #  define YYSIZE_T unsigned int
  # endif
  #endif
  
  #define YYSIZE_MAXIMUM ((YYSIZE_T) -1)
  
  #ifndef YY_
  # if defined YYENABLE_NLS && YYENABLE_NLS
  #  if ENABLE_NLS
  #   include <libintl.h> /* INFRINGES ON USER NAME SPACE */
  #   define YY_(msgid) dgettext ("bison-runtime", msgid)
  #  endif
  # endif
  # ifndef YY_
  #  define YY_(msgid) msgid
  # 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
  
  /* Identity function, used to suppress warnings about constant conditions.  */
  #ifndef lint
  # define YYID(n) (n)
  #else
  #if (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  static int
  YYID (int yyi)
  #else
  static int
  YYID (yyi)
      int yyi;
  #endif
  {
    return yyi;
  }
  #endif
  
  #if ! defined yyoverflow || YYERROR_VERBOSE
  
  /* The parser invokes alloca or malloc; define the necessary symbols.  */
  
  # ifdef YYSTACK_USE_ALLOCA
  #  if YYSTACK_USE_ALLOCA
  #   ifdef __GNUC__
  #    define YYSTACK_ALLOC __builtin_alloca
  #   elif defined __BUILTIN_VA_ARG_INCR
  #    include <alloca.h> /* INFRINGES ON USER NAME SPACE */
  #   elif defined _AIX
  #    define YYSTACK_ALLOC __alloca
  #   elif defined _MSC_VER
  #    include <malloc.h> /* INFRINGES ON USER NAME SPACE */
  #    define alloca _alloca
  #   else
  #    define YYSTACK_ALLOC alloca
  #    if ! defined _ALLOCA_H && ! defined _STDLIB_H && (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  #     include <stdlib.h> /* INFRINGES ON USER NAME SPACE */
  #     ifndef _STDLIB_H
  #      define _STDLIB_H 1
  #     endif
  #    endif
  #   endif
  #  endif
  # endif
  
  # ifdef YYSTACK_ALLOC
     /* Pacify GCC's `empty if-body' warning.  */
  #  define YYSTACK_FREE(Ptr) do { /* empty */; } while (YYID (0))
  #  ifndef YYSTACK_ALLOC_MAXIMUM
      /* The OS might guarantee only one guard page at the bottom of the stack,
         and a page size can be as small as 4096 bytes.  So we cannot safely
         invoke alloca (N) if N exceeds 4096.  Use a slightly smaller number
         to allow for a few compiler-allocated temporary stack slots.  */
  #   define YYSTACK_ALLOC_MAXIMUM 4032 /* reasonable circa 2006 */
  #  endif
  # else
  #  define YYSTACK_ALLOC YYMALLOC
  #  define YYSTACK_FREE YYFREE
  #  ifndef YYSTACK_ALLOC_MAXIMUM
  #   define YYSTACK_ALLOC_MAXIMUM YYSIZE_MAXIMUM
  #  endif
  #  if (defined __cplusplus && ! defined _STDLIB_H \
         && ! ((defined YYMALLOC || defined malloc) \
  	     && (defined YYFREE || defined free)))
  #   include <stdlib.h> /* INFRINGES ON USER NAME SPACE */
  #   ifndef _STDLIB_H
  #    define _STDLIB_H 1
  #   endif
  #  endif
  #  ifndef YYMALLOC
  #   define YYMALLOC malloc
  #   if ! defined malloc && ! defined _STDLIB_H && (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  void *malloc (YYSIZE_T); /* INFRINGES ON USER NAME SPACE */
  #   endif
  #  endif
  #  ifndef YYFREE
  #   define YYFREE free
  #   if ! defined free && ! defined _STDLIB_H && (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  void free (void *); /* INFRINGES ON USER NAME SPACE */
  #   endif
  #  endif
  # endif
  #endif /* ! defined yyoverflow || YYERROR_VERBOSE */
  
  
  #if (! defined yyoverflow \
       && (! defined __cplusplus \
  	 || (defined YYSTYPE_IS_TRIVIAL && YYSTYPE_IS_TRIVIAL)))
  
  /* A type that is properly aligned for any stack member.  */
  union yyalloc
  {
    yytype_int16 yyss_alloc;
    YYSTYPE yyvs_alloc;
  };
  
  /* The size of the maximum gap between one aligned stack and the next.  */
  # define YYSTACK_GAP_MAXIMUM (sizeof (union yyalloc) - 1)
  
  /* The size of an array large to enough to hold all stacks, each with
     N elements.  */
  # define YYSTACK_BYTES(N) \
       ((N) * (sizeof (yytype_int16) + sizeof (YYSTYPE)) \
        + YYSTACK_GAP_MAXIMUM)
  
  /* Copy COUNT objects from FROM to TO.  The source and destination do
     not overlap.  */
  # ifndef YYCOPY
  #  if defined __GNUC__ && 1 < __GNUC__
  #   define YYCOPY(To, From, Count) \
        __builtin_memcpy (To, From, (Count) * sizeof (*(From)))
  #  else
  #   define YYCOPY(To, From, Count)		\
        do					\
  	{					\
  	  YYSIZE_T yyi;				\
  	  for (yyi = 0; yyi < (Count); yyi++)	\
  	    (To)[yyi] = (From)[yyi];		\
  	}					\
        while (YYID (0))
  #  endif
  # endif
  
  /* Relocate STACK from its old location to the new one.  The
     local variables YYSIZE and YYSTACKSIZE give the old and new number of
     elements in the stack, and YYPTR gives the new location of the
     stack.  Advance YYPTR to a properly aligned location for the next
     stack.  */
  # define YYSTACK_RELOCATE(Stack_alloc, Stack)				\
      do									\
        {									\
  	YYSIZE_T yynewbytes;						\
  	YYCOPY (&yyptr->Stack_alloc, Stack, yysize);			\
  	Stack = &yyptr->Stack_alloc;					\
  	yynewbytes = yystacksize * sizeof (*Stack) + YYSTACK_GAP_MAXIMUM; \
  	yyptr += yynewbytes / sizeof (*yyptr);				\
        }									\
      while (YYID (0))
  
  #endif
  
  /* YYFINAL -- State number of the termination state.  */
  #define YYFINAL  14
  /* YYLAST -- Last index in YYTABLE.  */
  #define YYLAST   175
  
  /* YYNTOKENS -- Number of terminals.  */
  #define YYNTOKENS  27
  /* YYNNTS -- Number of nonterminals.  */
  #define YYNNTS  3
  /* YYNRULES -- Number of rules.  */
  #define YYNRULES  26
  /* YYNRULES -- Number of states.  */
  #define YYNSTATES  52
  
  /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
  #define YYUNDEFTOK  2
  #define YYMAXUTOK   267
  
  #define YYTRANSLATE(YYX)						\
    ((unsigned int) (YYX) <= YYMAXUTOK ? yytranslate[YYX] : YYUNDEFTOK)
  
  /* YYTRANSLATE[YYLEX] -- Bison symbol number corresponding to YYLEX.  */
  static const yytype_uint8 yytranslate[] =
  {
         0,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,    23,     2,     2,     2,    21,     8,     2,
        25,    26,    19,    17,     2,    18,     2,    20,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
        11,     2,    12,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     7,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     6,     2,    24,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     1,     2,     3,     4,
         5,     9,    10,    13,    14,    15,    16,    22
  };
  
  #if YYDEBUG
  /* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
     YYRHS.  */
  static const yytype_uint8 yyprhs[] =
  {
         0,     0,     3,     5,     7,    11,    15,    19,    23,    27,
        31,    35,    39,    43,    47,    51,    55,    59,    63,    67,
        71,    75,    79,    82,    85,    88,    91
  };
  
  /* YYRHS -- A `-1'-separated list of the rules' RHS.  */
  static const yytype_int8 yyrhs[] =
  {
        28,     0,    -1,    29,    -1,     3,    -1,    29,     4,    29,
        -1,    29,     5,    29,    -1,    29,     6,    29,    -1,    29,
         7,    29,    -1,    29,     8,    29,    -1,    29,     9,    29,
        -1,    29,    10,    29,    -1,    29,    13,    29,    -1,    29,
        14,    29,    -1,    29,    12,    29,    -1,    29,    11,    29,
        -1,    29,    15,    29,    -1,    29,    16,    29,    -1,    29,
        18,    29,    -1,    29,    17,    29,    -1,    29,    21,    29,
        -1,    29,    20,    29,    -1,    29,    19,    29,    -1,    23,
        29,    -1,    24,    29,    -1,    18,    29,    -1,    17,    29,
        -1,    25,    29,    26,    -1
  };
  
  /* YYRLINE[YYN] -- source line where rule number YYN was defined.  */
  static const yytype_uint8 yyrline[] =
  {
         0,    85,    85,    92,    93,    96,    99,   102,   105,   108,
       111,   114,   117,   120,   123,   126,   129,   132,   135,   138,
       151,   164,   167,   170,   173,   176,   179
  };
  #endif
  
  #if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
  /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
     First, the terminals, then, starting at YYNTOKENS, nonterminals.  */
  static const char *const yytname[] =
  {
    "$end", "error", "$undefined", "CONST_INT", "OP_OR", "OP_AND", "'|'",
    "'^'", "'&'", "OP_NE", "OP_EQ", "'<'", "'>'", "OP_GE", "OP_LE",
    "OP_RIGHT", "OP_LEFT", "'+'", "'-'", "'*'", "'/'", "'%'", "UNARY", "'!'",
    "'~'", "'('", "')'", "$accept", "input", "expression", 0
  };
  #endif
  
  # ifdef YYPRINT
  /* YYTOKNUM[YYLEX-NUM] -- Internal token number corresponding to
     token YYLEX-NUM.  */
  static const yytype_uint16 yytoknum[] =
  {
         0,   256,   257,   258,   259,   260,   124,    94,    38,   261,
       262,    60,    62,   263,   264,   265,   266,    43,    45,    42,
        47,    37,   267,    33,   126,    40,    41
  };
  # endif
  
  /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
  static const yytype_uint8 yyr1[] =
  {
         0,    27,    28,    29,    29,    29,    29,    29,    29,    29,
        29,    29,    29,    29,    29,    29,    29,    29,    29,    29,
        29,    29,    29,    29,    29,    29,    29
  };
  
  /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
  static const yytype_uint8 yyr2[] =
  {
         0,     2,     1,     1,     3,     3,     3,     3,     3,     3,
         3,     3,     3,     3,     3,     3,     3,     3,     3,     3,
         3,     3,     2,     2,     2,     2,     3
  };
  
  /* YYDEFACT[STATE-NAME] -- Default rule to reduce with in state
     STATE-NUM when YYTABLE doesn't specify something else to do.  Zero
     means the default is an error.  */
  static const yytype_uint8 yydefact[] =
  {
         0,     3,     0,     0,     0,     0,     0,     0,     2,    25,
        24,    22,    23,     0,     1,     0,     0,     0,     0,     0,
         0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
         0,     0,     0,    26,     4,     5,     6,     7,     8,     9,
        10,    14,    13,    11,    12,    15,    16,    18,    17,    21,
        20,    19
  };
  
  /* YYDEFGOTO[NTERM-NUM].  */
  static const yytype_int8 yydefgoto[] =
  {
        -1,     7,     8
  };
  
  /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
     STATE-NUM.  */
  #define YYPACT_NINF -11
  static const yytype_int16 yypact[] =
  {
        46,   -11,    46,    46,    46,    46,    46,    12,    68,   -11,
       -11,   -11,   -11,    27,   -11,    46,    46,    46,    46,    46,
        46,    46,    46,    46,    46,    46,    46,    46,    46,    46,
        46,    46,    46,   -11,    85,   101,   116,   130,   143,   154,
       154,   -10,   -10,   -10,   -10,    37,    37,    31,    31,   -11,
       -11,   -11
  };
  
  /* YYPGOTO[NTERM-NUM].  */
  static const yytype_int8 yypgoto[] =
  {
       -11,   -11,    -2
  };
  
  /* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
     positive, shift that token.  If negative, reduce the rule which
     number is the opposite.  If zero, do what YYDEFACT says.
     If YYTABLE_NINF, syntax error.  */
  #define YYTABLE_NINF -1
  static const yytype_uint8 yytable[] =
  {
         9,    10,    11,    12,    13,    26,    27,    28,    29,    30,
        31,    32,    14,    34,    35,    36,    37,    38,    39,    40,
        41,    42,    43,    44,    45,    46,    47,    48,    49,    50,
        51,    15,    16,    17,    18,    19,    20,    21,    22,    23,
        24,    25,    26,    27,    28,    29,    30,    31,    32,     1,
        30,    31,    32,    33,    28,    29,    30,    31,    32,     0,
         0,     0,     0,     2,     3,     0,     0,     0,     0,     4,
         5,     6,    15,    16,    17,    18,    19,    20,    21,    22,
        23,    24,    25,    26,    27,    28,    29,    30,    31,    32,
        16,    17,    18,    19,    20,    21,    22,    23,    24,    25,
        26,    27,    28,    29,    30,    31,    32,    17,    18,    19,
        20,    21,    22,    23,    24,    25,    26,    27,    28,    29,
        30,    31,    32,    18,    19,    20,    21,    22,    23,    24,
        25,    26,    27,    28,    29,    30,    31,    32,    19,    20,
        21,    22,    23,    24,    25,    26,    27,    28,    29,    30,
        31,    32,    20,    21,    22,    23,    24,    25,    26,    27,
        28,    29,    30,    31,    32,    22,    23,    24,    25,    26,
        27,    28,    29,    30,    31,    32
  };
  
  static const yytype_int8 yycheck[] =
  {
         2,     3,     4,     5,     6,    15,    16,    17,    18,    19,
        20,    21,     0,    15,    16,    17,    18,    19,    20,    21,
        22,    23,    24,    25,    26,    27,    28,    29,    30,    31,
        32,     4,     5,     6,     7,     8,     9,    10,    11,    12,
        13,    14,    15,    16,    17,    18,    19,    20,    21,     3,
        19,    20,    21,    26,    17,    18,    19,    20,    21,    -1,
        -1,    -1,    -1,    17,    18,    -1,    -1,    -1,    -1,    23,
        24,    25,     4,     5,     6,     7,     8,     9,    10,    11,
        12,    13,    14,    15,    16,    17,    18,    19,    20,    21,
         5,     6,     7,     8,     9,    10,    11,    12,    13,    14,
        15,    16,    17,    18,    19,    20,    21,     6,     7,     8,
         9,    10,    11,    12,    13,    14,    15,    16,    17,    18,
        19,    20,    21,     7,     8,     9,    10,    11,    12,    13,
        14,    15,    16,    17,    18,    19,    20,    21,     8,     9,
        10,    11,    12,    13,    14,    15,    16,    17,    18,    19,
        20,    21,     9,    10,    11,    12,    13,    14,    15,    16,
        17,    18,    19,    20,    21,    11,    12,    13,    14,    15,
        16,    17,    18,    19,    20,    21
  };
  
  /* YYSTOS[STATE-NUM] -- The (internal number of the) accessing
     symbol of state STATE-NUM.  */
  static const yytype_uint8 yystos[] =
  {
         0,     3,    17,    18,    23,    24,    25,    28,    29,    29,
        29,    29,    29,    29,     0,     4,     5,     6,     7,     8,
         9,    10,    11,    12,    13,    14,    15,    16,    17,    18,
        19,    20,    21,    26,    29,    29,    29,    29,    29,    29,
        29,    29,    29,    29,    29,    29,    29,    29,    29,    29,
        29,    29
  };
  
  #define yyerrok		(yyerrstatus = 0)
  #define yyclearin	(yychar = YYEMPTY)
  #define YYEMPTY		(-2)
  #define YYEOF		0
  
  #define YYACCEPT	goto yyacceptlab
  #define YYABORT		goto yyabortlab
  #define YYERROR		goto yyerrorlab
  
  
  /* Like YYERROR except do call yyerror.  This remains here temporarily
     to ease the transition to the new meaning of YYERROR, for GCC.
     Once GCC version 2 has supplanted version 1, this can go.  However,
     YYFAIL appears to be in use.  Nevertheless, it is formally deprecated
     in Bison 2.4.2's NEWS entry, where a plan to phase it out is
     discussed.  */
  
  #define YYFAIL		goto yyerrlab
  #if defined YYFAIL
    /* This is here to suppress warnings from the GCC cpp's
       -Wunused-macros.  Normally we don't worry about that warning, but
       some users do, and we want to make it easy for users to remove
       YYFAIL uses, which will produce warnings from Bison 2.5.  */
  #endif
  
  #define YYRECOVERING()  (!!yyerrstatus)
  
  #define YYBACKUP(Token, Value)					\
  do								\
    if (yychar == YYEMPTY && yylen == 1)				\
      {								\
        yychar = (Token);						\
        yylval = (Value);						\
        yytoken = YYTRANSLATE (yychar);				\
        YYPOPSTACK (1);						\
        goto yybackup;						\
      }								\
    else								\
      {								\
        yyerror (context, YY_("syntax error: cannot back up")); \
        YYERROR;							\
      }								\
  while (YYID (0))
  
  
  #define YYTERROR	1
  #define YYERRCODE	256
  
  
  /* 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).  */
  
  #define YYRHSLOC(Rhs, K) ((Rhs)[K])
  #ifndef YYLLOC_DEFAULT
  # define YYLLOC_DEFAULT(Current, Rhs, N)				\
      do									\
        if (YYID (N))                                                    \
  	{								\
  	  (Current).first_line   = YYRHSLOC (Rhs, 1).first_line;	\
  	  (Current).first_column = YYRHSLOC (Rhs, 1).first_column;	\
  	  (Current).last_line    = YYRHSLOC (Rhs, N).last_line;		\
  	  (Current).last_column  = YYRHSLOC (Rhs, N).last_column;	\
  	}								\
        else								\
  	{								\
  	  (Current).first_line   = (Current).last_line   =		\
  	    YYRHSLOC (Rhs, 0).last_line;				\
  	  (Current).first_column = (Current).last_column =		\
  	    YYRHSLOC (Rhs, 0).last_column;				\
  	}								\
      while (YYID (0))
  #endif
  
  
  /* YY_LOCATION_PRINT -- Print the location on the stream.
     This macro was not mandated originally: define only if we know
     we won't break user code: when these are the locations we know.  */
  
  #ifndef YY_LOCATION_PRINT
  # if defined YYLTYPE_IS_TRIVIAL && YYLTYPE_IS_TRIVIAL
  #  define YY_LOCATION_PRINT(File, Loc)			\
       fprintf (File, "%d.%d-%d.%d",			\
  	      (Loc).first_line, (Loc).first_column,	\
  	      (Loc).last_line,  (Loc).last_column)
  # else
  #  define YY_LOCATION_PRINT(File, Loc) ((void) 0)
  # endif
  #endif
  
  
  /* YYLEX -- calling `yylex' with the right arguments.  */
  
  #ifdef YYLEX_PARAM
  # define YYLEX yylex (&yylval, YYLEX_PARAM)
  #else
  # define YYLEX yylex (&yylval, context)
  #endif
  
  /* Enable debugging if requested.  */
  #if YYDEBUG
  
  # ifndef YYFPRINTF
  #  include <stdio.h> /* INFRINGES ON USER NAME SPACE */
  #  define YYFPRINTF fprintf
  # endif
  
  # define YYDPRINTF(Args)			\
  do {						\
    if (yydebug)					\
      YYFPRINTF Args;				\
  } while (YYID (0))
  
  # define YY_SYMBOL_PRINT(Title, Type, Value, Location)			  \
  do {									  \
    if (yydebug)								  \
      {									  \
        YYFPRINTF (stderr, "%s ", Title);					  \
        yy_symbol_print (stderr,						  \
  		  Type, Value, context); \
        YYFPRINTF (stderr, "\n");						  \
      }									  \
  } while (YYID (0))
  
  
  /*--------------------------------.
  | Print this symbol on YYOUTPUT.  |
  `--------------------------------*/
  
  /*ARGSUSED*/
  #if (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  static void
  yy_symbol_value_print (FILE *yyoutput, int yytype, YYSTYPE const * const yyvaluep, Context *context)
  #else
  static void
  yy_symbol_value_print (yyoutput, yytype, yyvaluep, context)
      FILE *yyoutput;
      int yytype;
      YYSTYPE const * const yyvaluep;
      Context *context;
  #endif
  {
    if (!yyvaluep)
      return;
    YYUSE (context);
  # ifdef YYPRINT
    if (yytype < YYNTOKENS)
      YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
  # else
    YYUSE (yyoutput);
  # endif
    switch (yytype)
      {
        default:
  	break;
      }
  }
  
  
  /*--------------------------------.
  | Print this symbol on YYOUTPUT.  |
  `--------------------------------*/
  
  #if (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  static void
  yy_symbol_print (FILE *yyoutput, int yytype, YYSTYPE const * const yyvaluep, Context *context)
  #else
  static void
  yy_symbol_print (yyoutput, yytype, yyvaluep, context)
      FILE *yyoutput;
      int yytype;
      YYSTYPE const * const yyvaluep;
      Context *context;
  #endif
  {
    if (yytype < YYNTOKENS)
      YYFPRINTF (yyoutput, "token %s (", yytname[yytype]);
    else
      YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]);
  
    yy_symbol_value_print (yyoutput, yytype, yyvaluep, context);
    YYFPRINTF (yyoutput, ")");
  }
  
  /*------------------------------------------------------------------.
  | yy_stack_print -- Print the state stack from its BOTTOM up to its |
  | TOP (included).                                                   |
  `------------------------------------------------------------------*/
  
  #if (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  static void
  yy_stack_print (yytype_int16 *yybottom, yytype_int16 *yytop)
  #else
  static void
  yy_stack_print (yybottom, yytop)
      yytype_int16 *yybottom;
      yytype_int16 *yytop;
  #endif
  {
    YYFPRINTF (stderr, "Stack now");
    for (; yybottom <= yytop; yybottom++)
      {
        int yybot = *yybottom;
        YYFPRINTF (stderr, " %d", yybot);
      }
    YYFPRINTF (stderr, "\n");
  }
  
  # define YY_STACK_PRINT(Bottom, Top)				\
  do {								\
    if (yydebug)							\
      yy_stack_print ((Bottom), (Top));				\
  } while (YYID (0))
  
  
  /*------------------------------------------------.
  | Report that the YYRULE is going to be reduced.  |
  `------------------------------------------------*/
  
  #if (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  static void
  yy_reduce_print (YYSTYPE *yyvsp, int yyrule, Context *context)
  #else
  static void
  yy_reduce_print (yyvsp, yyrule, context)
      YYSTYPE *yyvsp;
      int yyrule;
      Context *context;
  #endif
  {
    int yynrhs = yyr2[yyrule];
    int yyi;
    unsigned long int yylno = yyrline[yyrule];
    YYFPRINTF (stderr, "Reducing stack by rule %d (line %lu):\n",
  	     yyrule - 1, yylno);
    /* The symbols being reduced.  */
    for (yyi = 0; yyi < yynrhs; yyi++)
      {
        YYFPRINTF (stderr, "   $%d = ", yyi + 1);
        yy_symbol_print (stderr, yyrhs[yyprhs[yyrule] + yyi],
  		       &(yyvsp[(yyi + 1) - (yynrhs)])
  		       		       , context);
        YYFPRINTF (stderr, "\n");
      }
  }
  
  # define YY_REDUCE_PRINT(Rule)		\
  do {					\
    if (yydebug)				\
      yy_reduce_print (yyvsp, Rule, context); \
  } while (YYID (0))
  
  /* Nonzero means print parse trace.  It is left uninitialized so that
     multiple parsers can coexist.  */
  int yydebug;
  #else /* !YYDEBUG */
  # define YYDPRINTF(Args)
  # define YY_SYMBOL_PRINT(Title, Type, Value, Location)
  # define YY_STACK_PRINT(Bottom, Top)
  # define YY_REDUCE_PRINT(Rule)
  #endif /* !YYDEBUG */
  
  
  /* YYINITDEPTH -- initial size of the parser's stacks.  */
  #ifndef	YYINITDEPTH
  # define YYINITDEPTH 200
  #endif
  
  /* YYMAXDEPTH -- maximum size the stacks can grow to (effective only
     if the built-in stack extension method is used).
  
     Do not make this value too large; the results are undefined if
     YYSTACK_ALLOC_MAXIMUM < YYSTACK_BYTES (YYMAXDEPTH)
     evaluated with infinite-precision integer arithmetic.  */
  
  #ifndef YYMAXDEPTH
  # define YYMAXDEPTH 10000
  #endif
  
  
  
  #if YYERROR_VERBOSE
  
  # ifndef yystrlen
  #  if defined __GLIBC__ && defined _STRING_H
  #   define yystrlen strlen
  #  else
  /* Return the length of YYSTR.  */
  #if (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  static YYSIZE_T
  yystrlen (const char *yystr)
  #else
  static YYSIZE_T
  yystrlen (yystr)
      const char *yystr;
  #endif
  {
    YYSIZE_T yylen;
    for (yylen = 0; yystr[yylen]; yylen++)
      continue;
    return yylen;
  }
  #  endif
  # endif
  
  # ifndef yystpcpy
  #  if defined __GLIBC__ && defined _STRING_H && defined _GNU_SOURCE
  #   define yystpcpy stpcpy
  #  else
  /* Copy YYSRC to YYDEST, returning the address of the terminating '\0' in
     YYDEST.  */
  #if (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  static char *
  yystpcpy (char *yydest, const char *yysrc)
  #else
  static char *
  yystpcpy (yydest, yysrc)
      char *yydest;
      const char *yysrc;
  #endif
  {
    char *yyd = yydest;
    const char *yys = yysrc;
  
    while ((*yyd++ = *yys++) != '\0')
      continue;
  
    return yyd - 1;
  }
  #  endif
  # endif
  
  # ifndef yytnamerr
  /* Copy to YYRES the contents of 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.  If YYRES is
     null, do not copy; instead, return the length of what the result
     would have been.  */
  static YYSIZE_T
  yytnamerr (char *yyres, const char *yystr)
  {
    if (*yystr == '"')
      {
        YYSIZE_T yyn = 0;
        char const *yyp = yystr;
  
        for (;;)
  	switch (*++yyp)
  	  {
  	  case '\'':
  	  case ',':
  	    goto do_not_strip_quotes;
  
  	  case '\\':
  	    if (*++yyp != '\\')
  	      goto do_not_strip_quotes;
  	    /* Fall through.  */
  	  default:
  	    if (yyres)
  	      yyres[yyn] = *yyp;
  	    yyn++;
  	    break;
  
  	  case '"':
  	    if (yyres)
  	      yyres[yyn] = '\0';
  	    return yyn;
  	  }
      do_not_strip_quotes: ;
      }
  
    if (! yyres)
      return yystrlen (yystr);
  
    return yystpcpy (yyres, yystr) - yyres;
  }
  # endif
  
  /* Copy into YYRESULT an error message about the unexpected token
     YYCHAR while in state YYSTATE.  Return the number of bytes copied,
     including the terminating null byte.  If YYRESULT is null, do not
     copy anything; just return the number of bytes that would be
     copied.  As a special case, return 0 if an ordinary "syntax error"
     message will do.  Return YYSIZE_MAXIMUM if overflow occurs during
     size calculation.  */
  static YYSIZE_T
  yysyntax_error (char *yyresult, int yystate, int yychar)
  {
    int yyn = yypact[yystate];
  
    if (! (YYPACT_NINF < yyn && yyn <= YYLAST))
      return 0;
    else
      {
        int yytype = YYTRANSLATE (yychar);
        YYSIZE_T yysize0 = yytnamerr (0, yytname[yytype]);
        YYSIZE_T yysize = yysize0;
        YYSIZE_T yysize1;
        int yysize_overflow = 0;
        enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
        char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];
        int yyx;
  
  # if 0
        /* This is so xgettext sees the translatable formats that are
  	 constructed on the fly.  */
        YY_("syntax error, unexpected %s");
        YY_("syntax error, unexpected %s, expecting %s");
        YY_("syntax error, unexpected %s, expecting %s or %s");
        YY_("syntax error, unexpected %s, expecting %s or %s or %s");
        YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s");
  # endif
        char *yyfmt;
        char const *yyf;
        static char const yyunexpected[] = "syntax error, unexpected %s";
        static char const yyexpecting[] = ", expecting %s";
        static char const yyor[] = " or %s";
        char yyformat[sizeof yyunexpected
  		    + sizeof yyexpecting - 1
  		    + ((YYERROR_VERBOSE_ARGS_MAXIMUM - 2)
  		       * (sizeof yyor - 1))];
        char const *yyprefix = yyexpecting;
  
        /* Start YYX at -YYN if negative to avoid negative indexes in
  	 YYCHECK.  */
        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;
        int yycount = 1;
  
        yyarg[0] = yytname[yytype];
        yyfmt = yystpcpy (yyformat, yyunexpected);
  
        for (yyx = yyxbegin; yyx < yyxend; ++yyx)
  	if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR)
  	  {
  	    if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
  	      {
  		yycount = 1;
  		yysize = yysize0;
  		yyformat[sizeof yyunexpected - 1] = '\0';
  		break;
  	      }
  	    yyarg[yycount++] = yytname[yyx];
  	    yysize1 = yysize + yytnamerr (0, yytname[yyx]);
  	    yysize_overflow |= (yysize1 < yysize);
  	    yysize = yysize1;
  	    yyfmt = yystpcpy (yyfmt, yyprefix);
  	    yyprefix = yyor;
  	  }
  
        yyf = YY_(yyformat);
        yysize1 = yysize + yystrlen (yyf);
        yysize_overflow |= (yysize1 < yysize);
        yysize = yysize1;
  
        if (yysize_overflow)
  	return YYSIZE_MAXIMUM;
  
        if (yyresult)
  	{
  	  /* Avoid sprintf, as that infringes on the user's name space.
  	     Don't have undefined behavior even if the translation
  	     produced a string with the wrong number of "%s"s.  */
  	  char *yyp = yyresult;
  	  int yyi = 0;
  	  while ((*yyp = *yyf) != '\0')
  	    {
  	      if (*yyp == '%' && yyf[1] == 's' && yyi < yycount)
  		{
  		  yyp += yytnamerr (yyp, yyarg[yyi++]);
  		  yyf += 2;
  		}
  	      else
  		{
  		  yyp++;
  		  yyf++;
  		}
  	    }
  	}
        return yysize;
      }
  }
  #endif /* YYERROR_VERBOSE */
  
  
  /*-----------------------------------------------.
  | Release the memory associated to this symbol.  |
  `-----------------------------------------------*/
  
  /*ARGSUSED*/
  #if (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  static void
  yydestruct (const char *yymsg, int yytype, YYSTYPE *yyvaluep, Context *context)
  #else
  static void
  yydestruct (yymsg, yytype, yyvaluep, context)
      const char *yymsg;
      int yytype;
      YYSTYPE *yyvaluep;
      Context *context;
  #endif
  {
    YYUSE (yyvaluep);
    YYUSE (context);
  
    if (!yymsg)
      yymsg = "Deleting";
    YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);
  
    switch (yytype)
      {
  
        default:
  	break;
      }
  }
  
  /* Prevent warnings from -Wmissing-prototypes.  */
  #ifdef YYPARSE_PARAM
  #if defined __STDC__ || defined __cplusplus
  int yyparse (void *YYPARSE_PARAM);
  #else
  int yyparse ();
  #endif
  #else /* ! YYPARSE_PARAM */
  #if defined __STDC__ || defined __cplusplus
  int yyparse (Context *context);
  #else
  int yyparse ();
  #endif
  #endif /* ! YYPARSE_PARAM */
  
  
  
  
  
  /*-------------------------.
  | yyparse or yypush_parse.  |
  `-------------------------*/
  
  #ifdef YYPARSE_PARAM
  #if (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  int
  yyparse (void *YYPARSE_PARAM)
  #else
  int
  yyparse (YYPARSE_PARAM)
      void *YYPARSE_PARAM;
  #endif
  #else /* ! YYPARSE_PARAM */
  #if (defined __STDC__ || defined __C99__FUNC__ \
       || defined __cplusplus || defined _MSC_VER)
  int
  yyparse (Context *context)
  #else
  int
  yyparse (context)
      Context *context;
  #endif
  #endif
  {
  /* The lookahead symbol.  */
  int yychar;
  
  /* The semantic value of the lookahead symbol.  */
  YYSTYPE yylval;
  
      /* Number of syntax errors so far.  */
      int yynerrs;
  
      int yystate;
      /* Number of tokens to shift before error messages enabled.  */
      int yyerrstatus;
  
      /* The stacks and their tools:
         `yyss': related to states.
         `yyvs': related to semantic values.
  
         Refer to the stacks thru separate pointers, to allow yyoverflow
         to reallocate them elsewhere.  */
  
      /* The state stack.  */
      yytype_int16 yyssa[YYINITDEPTH];
      yytype_int16 *yyss;
      yytype_int16 *yyssp;
  
      /* The semantic value stack.  */
      YYSTYPE yyvsa[YYINITDEPTH];
      YYSTYPE *yyvs;
      YYSTYPE *yyvsp;
  
      YYSIZE_T yystacksize;
  
    int yyn;
    int yyresult;
    /* Lookahead token as an internal (translated) token number.  */
    int yytoken;
    /* The variables used to return semantic value and location from the
       action routines.  */
    YYSTYPE yyval;
  
  #if YYERROR_VERBOSE
    /* Buffer for error messages, and its allocated size.  */
    char yymsgbuf[128];
    char *yymsg = yymsgbuf;
    YYSIZE_T yymsg_alloc = sizeof yymsgbuf;
  #endif
  
  #define YYPOPSTACK(N)   (yyvsp -= (N), yyssp -= (N))
  
    /* The number of symbols on the RHS of the reduced rule.
       Keep to zero when no symbol should be popped.  */
    int yylen = 0;
  
    yytoken = 0;
    yyss = yyssa;
    yyvs = yyvsa;
    yystacksize = YYINITDEPTH;
  
    YYDPRINTF ((stderr, "Starting parse\n"));
  
    yystate = 0;
    yyerrstatus = 0;
    yynerrs = 0;
    yychar = YYEMPTY; /* Cause a token to be read.  */
  
    /* Initialize stack pointers.
       Waste one element of value and location stack
       so that they stay on the same level as the state stack.
       The wasted elements are never initialized.  */
    yyssp = yyss;
    yyvsp = yyvs;
  
    goto yysetstate;
  
  /*------------------------------------------------------------.
  | yynewstate -- Push a new state, which is found in yystate.  |
  `------------------------------------------------------------*/
   yynewstate:
    /* In all cases, when you get here, the value and location stacks
       have just been pushed.  So pushing a state here evens the stacks.  */
    yyssp++;
  
   yysetstate:
    *yyssp = yystate;
  
    if (yyss + yystacksize - 1 <= yyssp)
      {
        /* Get the current used size of the three stacks, in elements.  */
        YYSIZE_T yysize = yyssp - yyss + 1;
  
  #ifdef yyoverflow
        {
  	/* Give user a chance to reallocate the stack.  Use copies of
  	   these so that the &'s don't force the real ones into
  	   memory.  */
  	YYSTYPE *yyvs1 = yyvs;
  	yytype_int16 *yyss1 = yyss;
  
  	/* Each stack pointer address is followed by the size of the
  	   data in use in that stack, in bytes.  This used to be a
  	   conditional around just the two extra args, but that might
  	   be undefined if yyoverflow is a macro.  */
  	yyoverflow (YY_("memory exhausted"),
  		    &yyss1, yysize * sizeof (*yyssp),
  		    &yyvs1, yysize * sizeof (*yyvsp),
  		    &yystacksize);
  
  	yyss = yyss1;
  	yyvs = yyvs1;
        }
  #else /* no yyoverflow */
  # ifndef YYSTACK_RELOCATE
        goto yyexhaustedlab;
  # else
        /* Extend the stack our own way.  */
        if (YYMAXDEPTH <= yystacksize)
  	goto yyexhaustedlab;
        yystacksize *= 2;
        if (YYMAXDEPTH < yystacksize)
  	yystacksize = YYMAXDEPTH;
  
        {
  	yytype_int16 *yyss1 = yyss;
  	union yyalloc *yyptr =
  	  (union yyalloc *) YYSTACK_ALLOC (YYSTACK_BYTES (yystacksize));
  	if (! yyptr)
  	  goto yyexhaustedlab;
  	YYSTACK_RELOCATE (yyss_alloc, yyss);
  	YYSTACK_RELOCATE (yyvs_alloc, yyvs);
  #  undef YYSTACK_RELOCATE
  	if (yyss1 != yyssa)
  	  YYSTACK_FREE (yyss1);
        }
  # endif
  #endif /* no yyoverflow */
  
        yyssp = yyss + yysize - 1;
        yyvsp = yyvs + yysize - 1;
  
        YYDPRINTF ((stderr, "Stack size increased to %lu\n",
  		  (unsigned long int) yystacksize));
  
        if (yyss + yystacksize - 1 <= yyssp)
  	YYABORT;
      }
  
    YYDPRINTF ((stderr, "Entering state %d\n", yystate));
  
    if (yystate == YYFINAL)
      YYACCEPT;
  
    goto yybackup;
  
  /*-----------.
  | yybackup.  |
  `-----------*/
  yybackup:
  
    /* Do appropriate processing given the current state.  Read a
       lookahead token if we need one and don't already have one.  */
  
    /* First try to decide what to do without reference to lookahead token.  */
    yyn = yypact[yystate];
    if (yyn == YYPACT_NINF)
      goto yydefault;
  
    /* Not known => get a lookahead token if don't already have one.  */
  
    /* YYCHAR is either YYEMPTY or YYEOF or a valid lookahead symbol.  */
    if (yychar == YYEMPTY)
      {
        YYDPRINTF ((stderr, "Reading a token: "));
        yychar = YYLEX;
      }
  
    if (yychar <= YYEOF)
      {
        yychar = yytoken = YYEOF;
        YYDPRINTF ((stderr, "Now at end of input.\n"));
      }
    else
      {
        yytoken = YYTRANSLATE (yychar);
        YY_SYMBOL_PRINT ("Next token is", yytoken, &yylval, &yylloc);
      }
  
    /* If the proper action on seeing token YYTOKEN is to reduce or to
       detect an error, take that action.  */
    yyn += yytoken;
    if (yyn < 0 || YYLAST < yyn || yycheck[yyn] != yytoken)
      goto yydefault;
    yyn = yytable[yyn];
    if (yyn <= 0)
      {
        if (yyn == 0 || yyn == YYTABLE_NINF)
  	goto yyerrlab;
        yyn = -yyn;
        goto yyreduce;
      }
  
    /* Count tokens shifted since error; after three, turn off error
       status.  */
    if (yyerrstatus)
      yyerrstatus--;
  
    /* Shift the lookahead token.  */
    YY_SYMBOL_PRINT ("Shifting", yytoken, &yylval, &yylloc);
  
    /* Discard the shifted token.  */
    yychar = YYEMPTY;
  
    yystate = yyn;
    *++yyvsp = yylval;
  
    goto yynewstate;
  
  
  /*-----------------------------------------------------------.
  | yydefault -- do the default action for the current state.  |
  `-----------------------------------------------------------*/
  yydefault:
    yyn = yydefact[yystate];
    if (yyn == 0)
      goto yyerrlab;
    goto yyreduce;
  
  
  /*-----------------------------.
  | yyreduce -- Do a reduction.  |
  `-----------------------------*/
  yyreduce:
    /* yyn is the number of a rule to reduce with.  */
    yylen = yyr2[yyn];
  
    /* If YYLEN is nonzero, implement the default value of the action:
       `$$ = $1'.
  
       Otherwise, the following line sets YYVAL to garbage.
       This behavior is undocumented and Bison
       users should not rely upon it.  Assigning to YYVAL
       unconditionally makes the parser a bit smaller, and it avoids a
       GCC warning that YYVAL may be used uninitialized.  */
    yyval = yyvsp[1-yylen];
  
  
    YY_REDUCE_PRINT (yyn);
    switch (yyn)
      {
          case 2:
  
      {
          *(context->result) = static_cast<int>((yyvsp[(1) - (1)]));
          YYACCEPT;
      }
      break;
  
    case 4:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) || (yyvsp[(3) - (3)]);
      }
      break;
  
    case 5:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) && (yyvsp[(3) - (3)]);
      }
      break;
  
    case 6:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) | (yyvsp[(3) - (3)]);
      }
      break;
  
    case 7:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) ^ (yyvsp[(3) - (3)]);
      }
      break;
  
    case 8:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) & (yyvsp[(3) - (3)]);
      }
      break;
  
    case 9:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) != (yyvsp[(3) - (3)]);
      }
      break;
  
    case 10:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) == (yyvsp[(3) - (3)]);
      }
      break;
  
    case 11:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) >= (yyvsp[(3) - (3)]);
      }
      break;
  
    case 12:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) <= (yyvsp[(3) - (3)]);
      }
      break;
  
    case 13:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) > (yyvsp[(3) - (3)]);
      }
      break;
  
    case 14:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) < (yyvsp[(3) - (3)]);
      }
      break;
  
    case 15:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) >> (yyvsp[(3) - (3)]);
      }
      break;
  
    case 16:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) << (yyvsp[(3) - (3)]);
      }
      break;
  
    case 17:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) - (yyvsp[(3) - (3)]);
      }
      break;
  
    case 18:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) + (yyvsp[(3) - (3)]);
      }
      break;
  
    case 19:
  
      {
          if ((yyvsp[(3) - (3)]) == 0) {
              std::ostringstream stream;
              stream << (yyvsp[(1) - (3)]) << " % " << (yyvsp[(3) - (3)]);
              std::string text = stream.str();
              context->diagnostics->report(pp::Diagnostics::DIVISION_BY_ZERO,
                                           context->token->location,
                                           text.c_str());
              YYABORT;
          } else {
              (yyval) = (yyvsp[(1) - (3)]) % (yyvsp[(3) - (3)]);
          }
      }
      break;
  
    case 20:
  
      {
          if ((yyvsp[(3) - (3)]) == 0) {
              std::ostringstream stream;
              stream << (yyvsp[(1) - (3)]) << " / " << (yyvsp[(3) - (3)]);
              std::string text = stream.str();
              context->diagnostics->report(pp::Diagnostics::DIVISION_BY_ZERO,
                                           context->token->location,
                                           text.c_str());
              YYABORT;
          } else {
              (yyval) = (yyvsp[(1) - (3)]) / (yyvsp[(3) - (3)]);
          }
      }
      break;
  
    case 21:
  
      {
          (yyval) = (yyvsp[(1) - (3)]) * (yyvsp[(3) - (3)]);
      }
      break;
  
    case 22:
  
      {
          (yyval) = ! (yyvsp[(2) - (2)]);
      }
      break;
  
    case 23:
  
      {
          (yyval) = ~ (yyvsp[(2) - (2)]);
      }
      break;
  
    case 24:
  
      {
          (yyval) = - (yyvsp[(2) - (2)]);
      }
      break;
  
    case 25:
  
      {
          (yyval) = + (yyvsp[(2) - (2)]);
      }
      break;
  
    case 26:
  
      {
          (yyval) = (yyvsp[(2) - (3)]);
      }
      break;
  
  
  
        default: break;
      }
    YY_SYMBOL_PRINT ("-> $$ =", yyr1[yyn], &yyval, &yyloc);
  
    YYPOPSTACK (yylen);
    yylen = 0;
    YY_STACK_PRINT (yyss, yyssp);
  
    *++yyvsp = yyval;
  
    /* Now `shift' the result of the reduction.  Determine what state
       that goes to, based on the state we popped back to and the rule
       number reduced by.  */
  
    yyn = yyr1[yyn];
  
    yystate = yypgoto[yyn - YYNTOKENS] + *yyssp;
    if (0 <= yystate && yystate <= YYLAST && yycheck[yystate] == *yyssp)
      yystate = yytable[yystate];
    else
      yystate = yydefgoto[yyn - YYNTOKENS];
  
    goto yynewstate;
  
  
  /*------------------------------------.
  | yyerrlab -- here on detecting error |
  `------------------------------------*/
  yyerrlab:
    /* If not already recovering from an error, report this error.  */
    if (!yyerrstatus)
      {
        ++yynerrs;
  #if ! YYERROR_VERBOSE
        yyerror (context, YY_("syntax error"));
  #else
        {
  	YYSIZE_T yysize = yysyntax_error (0, yystate, yychar);
  	if (yymsg_alloc < yysize && yymsg_alloc < YYSTACK_ALLOC_MAXIMUM)
  	  {
  	    YYSIZE_T yyalloc = 2 * yysize;
  	    if (! (yysize <= yyalloc && yyalloc <= YYSTACK_ALLOC_MAXIMUM))
  	      yyalloc = YYSTACK_ALLOC_MAXIMUM;
  	    if (yymsg != yymsgbuf)
  	      YYSTACK_FREE (yymsg);
  	    yymsg = (char *) YYSTACK_ALLOC (yyalloc);
  	    if (yymsg)
  	      yymsg_alloc = yyalloc;
  	    else
  	      {
  		yymsg = yymsgbuf;
  		yymsg_alloc = sizeof yymsgbuf;
  	      }
  	  }
  
  	if (0 < yysize && yysize <= yymsg_alloc)
  	  {
  	    (void) yysyntax_error (yymsg, yystate, yychar);
  	    yyerror (context, yymsg);
  	  }
  	else
  	  {
  	    yyerror (context, YY_("syntax error"));
  	    if (yysize != 0)
  	      goto yyexhaustedlab;
  	  }
        }
  #endif
      }
  
  
  
    if (yyerrstatus == 3)
      {
        /* If just tried and failed to reuse lookahead token after an
  	 error, discard it.  */
  
        if (yychar <= YYEOF)
  	{
  	  /* Return failure if at end of input.  */
  	  if (yychar == YYEOF)
  	    YYABORT;
  	}
        else
  	{
  	  yydestruct ("Error: discarding",
  		      yytoken, &yylval, context);
  	  yychar = YYEMPTY;
  	}
      }
  
    /* Else will try to reuse lookahead token after shifting the error
       token.  */
    goto yyerrlab1;
  
  
  /*---------------------------------------------------.
  | yyerrorlab -- error raised explicitly by YYERROR.  |
  `---------------------------------------------------*/
  yyerrorlab:
  
    /* Pacify compilers like GCC when the user code never invokes
       YYERROR and the label yyerrorlab therefore never appears in user
       code.  */
    if (/*CONSTCOND*/ 0)
       goto yyerrorlab;
  
    /* Do not reclaim the symbols of the rule which action triggered
       this YYERROR.  */
    YYPOPSTACK (yylen);
    yylen = 0;
    YY_STACK_PRINT (yyss, yyssp);
    yystate = *yyssp;
    goto yyerrlab1;
  
  
  /*-------------------------------------------------------------.
  | yyerrlab1 -- common code for both syntax error and YYERROR.  |
  `-------------------------------------------------------------*/
  yyerrlab1:
    yyerrstatus = 3;	/* Each real token shifted decrements this.  */
  
    for (;;)
      {
        yyn = yypact[yystate];
        if (yyn != YYPACT_NINF)
  	{
  	  yyn += YYTERROR;
  	  if (0 <= yyn && yyn <= YYLAST && yycheck[yyn] == YYTERROR)
  	    {
  	      yyn = yytable[yyn];
  	      if (0 < yyn)
  		break;
  	    }
  	}
  
        /* Pop the current state because it cannot handle the error token.  */
        if (yyssp == yyss)
  	YYABORT;
  
  
        yydestruct ("Error: popping",
  		  yystos[yystate], yyvsp, context);
        YYPOPSTACK (1);
        yystate = *yyssp;
        YY_STACK_PRINT (yyss, yyssp);
      }
  
    *++yyvsp = yylval;
  
  
    /* Shift the error token.  */
    YY_SYMBOL_PRINT ("Shifting", yystos[yyn], yyvsp, yylsp);
  
    yystate = yyn;
    goto yynewstate;
  
  
  /*-------------------------------------.
  | yyacceptlab -- YYACCEPT comes here.  |
  `-------------------------------------*/
  yyacceptlab:
    yyresult = 0;
    goto yyreturn;
  
  /*-----------------------------------.
  | yyabortlab -- YYABORT comes here.  |
  `-----------------------------------*/
  yyabortlab:
    yyresult = 1;
    goto yyreturn;
  
  #if !defined(yyoverflow) || YYERROR_VERBOSE
  /*-------------------------------------------------.
  | yyexhaustedlab -- memory exhaustion comes here.  |
  `-------------------------------------------------*/
  yyexhaustedlab:
    yyerror (context, YY_("memory exhausted"));
    yyresult = 2;
    /* Fall through.  */
  #endif
  
  yyreturn:
    if (yychar != YYEMPTY)
       yydestruct ("Cleanup: discarding lookahead",
  		 yytoken, &yylval, context);
    /* Do not reclaim the symbols of the rule which action triggered
       this YYABORT or YYACCEPT.  */
    YYPOPSTACK (yylen);
    YY_STACK_PRINT (yyss, yyssp);
    while (yyssp != yyss)
      {
        yydestruct ("Cleanup: popping",
  		  yystos[*yyssp], yyvsp, context);
        YYPOPSTACK (1);
      }
  #ifndef yyoverflow
    if (yyss != yyssa)
      YYSTACK_FREE (yyss);
  #endif
  #if YYERROR_VERBOSE
    if (yymsg != yymsgbuf)
      YYSTACK_FREE (yymsg);
  #endif
    /* Make sure YYID is used.  */
    return YYID (yyresult);
  }
  
  
  
  
  
  int yylex(YYSTYPE* lvalp, Context* context)
  {
      int type = 0;
  
      pp::Token* token = context->token;
      switch (token->type)
      {
        case pp::Token::CONST_INT:
        {
          unsigned int val = 0;
          if (!token->uValue(&val))
          {
              context->diagnostics->report(pp::Diagnostics::INTEGER_OVERFLOW,
                                           token->location, token->text);
          }
          *lvalp = static_cast<YYSTYPE>(val);
          type = CONST_INT;
          break;
        }
        case pp::Token::OP_OR: type = OP_OR; break;
        case pp::Token::OP_AND: type = OP_AND; break;
        case pp::Token::OP_NE: type = OP_NE; break;
        case pp::Token::OP_EQ: type = OP_EQ; break;
        case pp::Token::OP_GE: type = OP_GE; break;
        case pp::Token::OP_LE: type = OP_LE; break;
        case pp::Token::OP_RIGHT: type = OP_RIGHT; break;
        case pp::Token::OP_LEFT: type = OP_LEFT; break;
        case '|': type = '|'; break;
        case '^': type = '^'; break;
        case '&': type = '&'; break;
        case '>': type = '>'; break;
        case '<': type = '<'; break;
        case '-': type = '-'; break;
        case '+': type = '+'; break;
        case '%': type = '%'; break;
        case '/': type = '/'; break;
        case '*': type = '*'; break;
        case '!': type = '!'; break;
        case '~': type = '~'; break;
        case '(': type = '('; break;
        case ')': type = ')'; break;
  
        default: break;
      }
  
      // Advance to the next token if the current one is valid.
      if (type != 0) context->lexer->lex(token);
  
      return type;
  }
  
  void yyerror(Context* context, const char* reason)
  {
      context->diagnostics->report(pp::Diagnostics::INVALID_EXPRESSION,
                                   context->token->location,
                                   reason);
  }
  
  namespace pp {
  
  ExpressionParser::ExpressionParser(Lexer* lexer, Diagnostics* diagnostics) :
      mLexer(lexer),
      mDiagnostics(diagnostics)
  {
  }
  
  bool ExpressionParser::parse(Token* token, int* result)
  {
      Context context;
      context.diagnostics = mDiagnostics;
      context.lexer = mLexer;
      context.token = token;
      context.result = result;
      int ret = yyparse(&context);
      switch (ret)
      {
        case 0:
        case 1:
          break;
  
        case 2:
          mDiagnostics->report(Diagnostics::OUT_OF_MEMORY, token->location, "");
          break;
  
        default:
          assert(false);
          mDiagnostics->report(Diagnostics::INTERNAL_ERROR, token->location, "");
          break;
      }
  
      return ret == 0;
  }
  
  }  // namespace pp
  
  

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