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。 sh-3ll

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/*
   Copyright (c) 2018, 2020, MariaDB Corporation.

   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; version 2 of the License.

   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, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#ifndef VERS_STRING_INCLUDED
#define VERS_STRING_INCLUDED

#include "lex_string.h"

/*
  LEX_CSTRING with comparison semantics.
*/

// db and table names: case sensitive (or insensitive) in table_alias_charset
struct Compare_table_names
{
  int operator()(const LEX_CSTRING& a, const LEX_CSTRING& b) const
  {
    DBUG_ASSERT(a.str[a.length] == 0);
    DBUG_ASSERT(b.str[b.length] == 0);
    return table_alias_charset->strnncoll(a.str, a.length,
                                          b.str, b.length);
  }
};

// column names and other identifiers: case insensitive in system_charset_info
struct Compare_identifiers
{
  int operator()(const LEX_CSTRING& a, const LEX_CSTRING& b) const
  {
    DBUG_ASSERT(a.str != NULL);
    DBUG_ASSERT(b.str != NULL);
    DBUG_ASSERT(a.str[a.length] == 0);
    DBUG_ASSERT(b.str[b.length] == 0);
    return my_strcasecmp(system_charset_info, a.str, b.str);
  }
};


template <class Compare>
struct Lex_cstring_with_compare : public Lex_cstring
{
public:
  Lex_cstring_with_compare() = default;
  Lex_cstring_with_compare(const char *_str, size_t _len) :
    Lex_cstring(_str, _len)
  { }
  Lex_cstring_with_compare(const LEX_CSTRING src) : Lex_cstring(src.str, src.length)
  { }
  explicit Lex_cstring_with_compare(const char *_str) : Lex_cstring(_str, strlen(_str))
  { }
  bool streq(const Lex_cstring_with_compare& b) const
  {
    return Lex_cstring::length == b.length && 0 == Compare()(*this, b);
  }
  operator const char* () const
  {
    return str;
  }
  operator bool () const
  {
    return str != NULL;
  }
};

typedef Lex_cstring_with_compare<Compare_identifiers> Lex_ident;
typedef Lex_cstring_with_compare<Compare_table_names> Lex_table_name;

#endif // VERS_STRING_INCLUDED