晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/share/gettext/intl/plural-exp.h
/* Expression parsing and evaluation for plural form selection.
   Copyright (C) 2000-2016 Free Software Foundation, Inc.
   Written by Ulrich Drepper <drepper@cygnus.com>, 2000.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef _PLURAL_EXP_H
#define _PLURAL_EXP_H

#ifndef internal_function
# define internal_function
#endif

#ifndef attribute_hidden
# define attribute_hidden
#endif

#ifdef __cplusplus
extern "C" {
#endif


enum expression_operator
{
  /* Without arguments:  */
  var,				/* The variable "n".  */
  num,				/* Decimal number.  */
  /* Unary operators:  */
  lnot,				/* Logical NOT.  */
  /* Binary operators:  */
  mult,				/* Multiplication.  */
  divide,			/* Division.  */
  module,			/* Modulo operation.  */
  plus,				/* Addition.  */
  minus,			/* Subtraction.  */
  less_than,			/* Comparison.  */
  greater_than,			/* Comparison.  */
  less_or_equal,		/* Comparison.  */
  greater_or_equal,		/* Comparison.  */
  equal,			/* Comparison for equality.  */
  not_equal,			/* Comparison for inequality.  */
  land,				/* Logical AND.  */
  lor,				/* Logical OR.  */
  /* Ternary operators:  */
  qmop				/* Question mark operator.  */
};

/* This is the representation of the expressions to determine the
   plural form.  */
struct expression
{
  int nargs;			/* Number of arguments.  */
  enum expression_operator operation;
  union
  {
    unsigned long int num;	/* Number value for `num'.  */
    struct expression *args[3];	/* Up to three arguments.  */
  } val;
};

/* This is the data structure to pass information to the parser and get
   the result in a thread-safe way.  */
struct parse_args
{
  const char *cp;
  struct expression *res;
};


/* Names for the libintl functions are a problem.  This source code is used
   1. in the GNU C Library library,
   2. in the GNU libintl library,
   3. in the GNU gettext tools.
   The function names in each situation must be different, to allow for
   binary incompatible changes in 'struct expression'.  Furthermore,
   1. in the GNU C Library library, the names have a __ prefix,
   2.+3. in the GNU libintl library and in the GNU gettext tools, the names
         must follow ANSI C and not start with __.
   So we have to distinguish the three cases.  */
#ifdef _LIBC
# define FREE_EXPRESSION __gettext_free_exp
# define PLURAL_PARSE __gettextparse
# define GERMANIC_PLURAL __gettext_germanic_plural
# define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural
#elif defined (IN_LIBINTL)
# define FREE_EXPRESSION libintl_gettext_free_exp
# define PLURAL_PARSE libintl_gettextparse
# define GERMANIC_PLURAL libintl_gettext_germanic_plural
# define EXTRACT_PLURAL_EXPRESSION libintl_gettext_extract_plural
#else
# define FREE_EXPRESSION free_plural_expression
# define PLURAL_PARSE parse_plural_expression
# define GERMANIC_PLURAL germanic_plural
# define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
#endif

#if (defined __GNUC__ && !(defined __APPLE_CC_ && __APPLE_CC__ > 1) \
     && !defined __cplusplus)                                       \
    || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)    \
    || (defined __SUNPRO_C && 0x560 <= __SUNPRO_C                   \
        && !(defined __STDC__ && __STDC__ == 1))
# define HAVE_STRUCT_INITIALIZER 1
#else
# define HAVE_STRUCT_INITIALIZER 0
#endif

extern void FREE_EXPRESSION (struct expression *exp)
     internal_function;
extern int PLURAL_PARSE (struct parse_args *arg);
#if HAVE_STRUCT_INITIALIZER
extern const struct expression GERMANIC_PLURAL attribute_hidden;
#else
extern struct expression GERMANIC_PLURAL attribute_hidden;
#endif
extern void EXTRACT_PLURAL_EXPRESSION (const char *nullentry,
				       const struct expression **pluralp,
				       unsigned long int *npluralsp)
     internal_function;

#if !defined (_LIBC) && !defined (IN_LIBINTL) && !defined (IN_LIBGLOCALE)
extern unsigned long int plural_eval (const struct expression *pexp,
				      unsigned long int n);
#endif


#ifdef __cplusplus
}
#endif

#endif /* _PLURAL_EXP_H */

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