perl – 在脚本的不同部分使用不同的哈希值

时间 2019-08-11

标签 perl 栏目 Perl

我有一个从文件中收集的哈希.下面的脚本将按预期打印所有值(注意我只包含脚本的重要部分,因此打开输入文件时不会添加太宽)：

use strict;
use warnings;

my %hash = ();
while (<$fh>) {
  my ($region, $site, $layer) = split;
  push @{$hash{$region}}, "$region $site $layer";
}
foreach my $values(keys %hash) {
  print $values,"\n";
}

然而我的问题是我不想根据键打印所有值,我实际上想要通过告诉perl我想要的东西来分割值并在不同区域打印它们,而不仅仅是打印$values.

例如,如果我有以下数据：

North belair layer2
North belair layer3
East Monte layer2
East Vista layer3

我实际上希望能够在其他区域使用这些值,并打印如下内容：

print "$site has layers: $layer"

将打印：

belair has layers: layer2 layer3

Monte has layers: layer2

Vista has layers: layer3

要么

print "$region has sites, $site and $site has layers: $layer";

然后将打印：

North has sites: belair and layers: layer2 layer3

East has sites: Monte Vista and layers: layer2 layer3

当我运行多个foreach循环时,我得到重复的结果,我不知道转到哪个方向.我所做的每一次搜索都只显示了如何打印键的所有$值

my %sites;
my %regions;
while (<>) {
   my ($region_id, $site_id, $layer_id) = split;

   # Use hashes instead of arrays to remove duplicates.    
   ++$sites{$site_id}{layers}{$layer_id};
   ++$regions{$region_id}{layers}{$layer_id};
   ++$regions{$region_id}{sites}{$site_id};
}

# "Flatten" hashes into sorted arrays of unique elements.
for my $site_id (keys(%sites)) {
   my $site = $sites{$site_id};
   $site->{layers} = [ sort keys(%{ $site->{layers} }) ];
}

for my $region_id (keys(%regions)) {
   my $region = $regions{$region_id};
   $region->{layers} = [ sort keys(%{ $region->{layers} }) ];
   $region->{sites}  = [ sort keys(%{ $region->{sites}  }) ];
}

# Now do what we want to do.
for my $site_id (sort keys(%sites)) {
   my $site = $sites{$site_id};
   print "$site_id has layers @{ $site->{layers} }\n";
}

for my $region_id (sort keys(%regions)) {
   my $region = $regions{$region_id};
   print "$region_id has sites @{ $region->{sites} } and layers @{ $region->{layers} }\n";
}