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/lib64/perl5/CORE/invlist_inline.h
/*    invlist_inline.h
 *
 *    Copyright (C) 2012 by Larry Wall and others
 *
 *    You may distribute under the terms of either the GNU General Public
 *    License or the Artistic License, as specified in the README file.
 */

#if defined(PERL_IN_UTF8_C) || defined(PERL_IN_REGCOMP_C) || defined(PERL_IN_REGEXEC_C)

/* An element is in an inversion list iff its index is even numbered: 0, 2, 4,
 * etc */
#define ELEMENT_RANGE_MATCHES_INVLIST(i) (! ((i) & 1))
#define PREV_RANGE_MATCHES_INVLIST(i) (! ELEMENT_RANGE_MATCHES_INVLIST(i))

/* This converts to/from our UVs to what the SV code is expecting: bytes. */
#define TO_INTERNAL_SIZE(x) ((x) * sizeof(UV))
#define FROM_INTERNAL_SIZE(x) ((x)/ sizeof(UV))

PERL_STATIC_INLINE bool*
S_get_invlist_offset_addr(SV* invlist)
{
    /* Return the address of the field that says whether the inversion list is
     * offset (it contains 1) or not (contains 0) */
    PERL_ARGS_ASSERT_GET_INVLIST_OFFSET_ADDR;

    assert(SvTYPE(invlist) == SVt_INVLIST);

    return &(((XINVLIST*) SvANY(invlist))->is_offset);
}

PERL_STATIC_INLINE UV
S__invlist_len(SV* const invlist)
{
    /* Returns the current number of elements stored in the inversion list's
     * array */

    PERL_ARGS_ASSERT__INVLIST_LEN;

    assert(SvTYPE(invlist) == SVt_INVLIST);

    return (SvCUR(invlist) == 0)
           ? 0
           : FROM_INTERNAL_SIZE(SvCUR(invlist)) - *get_invlist_offset_addr(invlist);
}

PERL_STATIC_INLINE bool
S__invlist_contains_cp(SV* const invlist, const UV cp)
{
    /* Does <invlist> contain code point <cp> as part of the set? */

    IV index = _invlist_search(invlist, cp);

    PERL_ARGS_ASSERT__INVLIST_CONTAINS_CP;

    return index >= 0 && ELEMENT_RANGE_MATCHES_INVLIST(index);
}

PERL_STATIC_INLINE UV*
S_invlist_array(SV* const invlist)
{
    /* Returns the pointer to the inversion list's array.  Every time the
     * length changes, this needs to be called in case malloc or realloc moved
     * it */

    PERL_ARGS_ASSERT_INVLIST_ARRAY;

    /* Must not be empty.  If these fail, you probably didn't check for <len>
     * being non-zero before trying to get the array */
    assert(_invlist_len(invlist));

    /* The very first element always contains zero, The array begins either
     * there, or if the inversion list is offset, at the element after it.
     * The offset header field determines which; it contains 0 or 1 to indicate
     * how much additionally to add */
    assert(0 == *(SvPVX(invlist)));
    return ((UV *) SvPVX(invlist) + *get_invlist_offset_addr(invlist));
}

#   if defined(PERL_IN_UTF8_C) || defined(PERL_IN_REGEXEC_C)

/* These symbols are only needed later in regcomp.c */
#       undef TO_INTERNAL_SIZE
#       undef FROM_INTERNAL_SIZE
#   endif

#endif

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