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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#!/usr/bin/perl -w
# diffs two files and writes an HTML output file.
use strict;
use CGI qw(:standard :html3);
use Algorithm::Diff 'traverse_sequences';
use Text::Tabs;
my ( @a, @b );
# Take care of whitespace.
sub preprocess
{
my $arrayRef = shift;
chomp(@$arrayRef);
@$arrayRef = expand(@$arrayRef);
}
# This will be called with both lines are the same
sub match
{
my ( $ia, $ib ) = @_;
print pre( $a[$ia] ), "\n";
}
# This will be called when there is a line in A that isn't in B
sub only_a
{
my ( $ia, $ib ) = @_;
print pre( { -class => 'onlyA' }, $a[$ia] ), "\n";
}
# This will be called when there is a line in B that isn't in A
sub only_b
{
my ( $ia, $ib ) = @_;
print pre( { -class => 'onlyB' }, $b[$ib] ), "\n";
}
# MAIN PROGRAM
# Check for two arguments.
print "usage: $0 file1 file2 > diff.html\n" if @ARGV != 2;
$tabstop = 4; # For Text::Tabs
# Read each file into an array.
open FH, $ARGV[0];
@a = <FH>;
close FH;
open FH, $ARGV[1];
@b = <FH>;
close FH;
# Expand whitespace
preprocess( \@a );
preprocess( \@b );
# inline style
my $style = <<EOS;
PRE {
margin-left: 24pt;
font-size: 12pt;
font-family: Courier, monospaced;
white-space: pre
}
PRE.onlyA { color: red }
PRE.onlyB { color: blue }
EOS
# Print out the starting HTML
print
# header(),
start_html(
{
-title => "$ARGV[0] vs. $ARGV[1]",
-style => { -code => $style }
}
),
h1(
{ -style => 'margin-left: 24pt' },
span( { -style => 'color: red' }, $ARGV[0] ),
span(" <i>vs.</i> "),
span( { -style => 'color: blue' }, $ARGV[1] )
),
"\n";
# And compare the arrays
traverse_sequences(
\@a, # first sequence
\@b, # second sequence
{
MATCH => \&match, # callback on identical lines
DISCARD_A => \&only_a, # callback on A-only
DISCARD_B => \&only_b, # callback on B-only
}
);
print end_html();