Perl:将散列引用(例如 Dumper 的输出)格式化为字符串

Perl: Format a hash reference (e.g. output of Dumper) into a String

我有一个包含嵌套 key/value 对的散列引用,散列引用 and/or 数组引用。

我想将 Data::Dumper 的结果模拟成一个字符串,但是:

  1. 从键中删除 'quotes'。
  2. 从结构中删除空格(但不是值)
  3. 奖励:按字母顺序对键进行排序。
  4. 额外奖励:首先打印 key/value 对,然后是散列引用,然后是数组引用。

例如:

#!/usr/bin/perl -w
use strict;
use warnings;

use Data::Dumper;

my $hash_ref = {
    'private' => {
        'locked' => 'FALSE',
        'allowedAuth' => 'Digest'
    },
    'profile' => 'Default',
    'id' => '123456',
    'privacy' => 'FALSE',
    'public' => [
    {
        'allowed' => 'FALSE',
        'configured' => {
            'profileId' => 'hello world'
        },
        'isDefault' => 'TRUE',
        'maxSessions' => '3'
    },
    {
        'isDefault' => 'FALSE',
        'privateId' => 'foo@bar.com',
        'maxSessions' => '3',
        'allowed' => 'FALSE',
        'implicit' => '1',
    }
    ],
    'indicator' => 'FALSE'
};

print STDERR Dumper ($hash_ref);

理想情况下,我希望输出为:

my $str = "id=>'123456',indicator=>'FALSE',profile=>'Default',privacy=>'FALSE',private=>{allowedAuth=>'Digest',locked=>'FALSE'},public=>[{allowed=>'FALSE',configured=>{profileId=>'hello world'},isDefault=>'TRUE',maxSessions=>'3'},{allowed=>'FALSE',implicit=>'1',isDefault=>'FALSE',maxSessions=>'3',privateId=>'foo@bar.com'}]";

我试过递归函数;但是,我不确定如何去掉末尾的逗号(尤其是散列引用——对于数组引用,我可以使用索引并检查它是否是最后一个)。另外,排序键似乎太难了。

sub recHash
{
    my ($hash_ref) = @_;
    my $response = "";
    for my $k (keys %$hash_ref) {
    my $v = $hash_ref->{$k};
    if (ref($v) eq "HASH") {
        $response .= "$k=>{" . recHash($v) . "}"; # recurse through the hash references.
    }
    elsif (ref($v) eq "ARRAY") {
        $response .= "$k=>[";
        # recurse through the array references.
        foreach my $item (@$v) {
        $response .= "{".recHash($item)."},";
        }
        $response .= "],";
        return $response;
    }
    else {
        $response .= "$k=>'$v',";
    }
    }
    return $response;
}

print recHash($hash_ref);

我的输出是(当我保留 运行 时我认为这是有缺陷的):

private=>{allowedAuth=>'Digest',locked=>'FALSE',}profile=>'Default',id=>'123456',indicator=>'FALSE',privacy=>'FALSE',public=>[{configured=>{profileId=>'hello world',}maxSessions=>'3',allowed=>'FALSE',isDefault=>'TRUE',},{allowed=>'FALSE',maxSessions=>'3',implicit=>'1',privateId=>'foo@bar.com',isDefault=>'FALSE',},],

您只需按如下方式对键进行排序:

for my $k (sort keys %$hash_ref) {

您在每个 运行 得到不同的输出,因为散列键是以随机顺序访问的。

开箱即用的 $Data::Dumper::Indent$Data::Dumper::Sortkeys 值将帮助您实现大部分目标。

use Data::Dumper;
my $hash_ref = { ... };

$Data::Dumper::Indent = 0;
$Data::Dumper::Sortkeys = sub {
    my ($hash) = @_;
    my %refval = ('' => -3, 'HASH' => -2, 'ARRAY' => -1);
    return [ sort {
         # prefer ref(val) "" to "HASH" to "ARRAY" to anything else
                  $refval{ref $hash->{$a}} <=> $refval{ref $hash->{$b}}
         # and then sort lexicographically
                  || $a cmp $b 
             } keys %$hash ];
};
my $rec_hash = Dumper($hash_ref);
$rec_hash =~ s/'(\w+)' => /=>/g;
$rec_hash =~ s/^$VAR1 = //;
print $rec_hash;

结果:

{id=>'123456',indicator=>'FALSE',privacy=>'FALSE',profile=>'Default',
 private=>{allowedAuth=>'Digest',locked=>'FALSE'},public=>
 [{allowed=>'FALSE',isDefault=>'TRUE',maxSessions=>'3',configured=>
 {profileId=>'hello world'}},allowed=>'FALSE',implicit=>'1',
 isDefault=>'FALSE',maxSessions=>'3',privateId=>'foo@bar.com'}]};