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/perl5/Text/Abbrev.pm
package Text::Abbrev;
require 5.005;		# Probably works on earlier versions too.
require Exporter;

our $VERSION = '1.02';

=head1 NAME

Text::Abbrev - abbrev - create an abbreviation table from a list

=head1 SYNOPSIS

    use Text::Abbrev;
    abbrev $hashref, LIST


=head1 DESCRIPTION

Stores all unambiguous truncations of each element of LIST
as keys in the associative array referenced by C<$hashref>.
The values are the original list elements.

=head1 EXAMPLE

    $hashref = abbrev qw(list edit send abort gripe);

    %hash = abbrev qw(list edit send abort gripe);

    abbrev $hashref, qw(list edit send abort gripe);

    abbrev(*hash, qw(list edit send abort gripe));

=cut

@ISA = qw(Exporter);
@EXPORT = qw(abbrev);

# Usage:
#	abbrev \%foo, LIST;
#	...
#	$long = $foo{$short};

sub abbrev {
    my ($word, $hashref, $glob, %table, $returnvoid);

    @_ or return;   # So we don't autovivify onto @_ and trigger warning
    if (ref($_[0])) {           # hash reference preferably
      $hashref = shift;
      $returnvoid = 1;
    } elsif (ref \$_[0] eq 'GLOB') {  # is actually a glob (deprecated)
      $hashref = \%{shift()};
      $returnvoid = 1;
    }
    %{$hashref} = ();

    WORD: foreach $word (@_) {
        for (my $len = (length $word) - 1; $len > 0; --$len) {
	    my $abbrev = substr($word,0,$len);
	    my $seen = ++$table{$abbrev};
	    if ($seen == 1) {	    # We're the first word so far to have
	    			    # this abbreviation.
	        $hashref->{$abbrev} = $word;
	    } elsif ($seen == 2) {  # We're the second word to have this
	    			    # abbreviation, so we can't use it.
	        delete $hashref->{$abbrev};
	    } else {		    # We're the third word to have this
	    			    # abbreviation, so skip to the next word.
	        next WORD;
	    }
	}
    }
    # Non-abbreviations always get entered, even if they aren't unique
    foreach $word (@_) {
        $hashref->{$word} = $word;
    }
    return if $returnvoid;
    if (wantarray) {
      %{$hashref};
    } else {
      $hashref;
    }
}

1;

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