如何列出给定范围内的所有变量？

Question

我知道我可以列出所有的包和lexcial变量在使用某个特定范围Padwalker的peek_our和peek_my,但我怎么能得到像全局变量的名称和值$"和$/？

#!/usr/bin/perl

use strict;
use warnings;

use PadWalker qw/peek_our peek_my/;
use Data::Dumper;

our $foo = 1;
our $bar = 2;

{
    my $foo = 3;
    print Dumper in_scope_variables();
}

print Dumper in_scope_variables();

sub in_scope_variables {
    my %in_scope = %{peek_our(1)};
    my $lexical  = peek_my(1);
    #lexicals hide package variables
    while (my ($var, $ref) = each %$lexical) {
        $in_scope{$var} = $ref;
    }
    ##############################################
    #FIXME: need to add globals to %in_scope here#
    ##############################################
    return \%in_scope;
}

Answer 1

您可以访问符号表,查看p."Perl编程"的第293页另请参阅"掌握Perl:http://www252.pair.com/comdog/mastering_perl/ 具体:http://www252.pair.com/comdog/mastering_perl/Chapters/08.symbol_tables.html

您正在寻找的那些变量将位于主命名空间下

谷歌快速搜索给了我:

{
    no strict 'refs';

    foreach my $entry ( keys %main:: )
    {
        print "$entry\n";
    }
}

你也可以

*sym = $main::{"/"}

同样适用于其他价值观

如果你想找到你可以做的符号类型(从掌握perl):

foreach my $entry ( keys %main:: )
{
    print "-" x 30, "Name: $entry\n";

    print "\tscalar is defined\n" if defined ${$entry};
    print "\tarray  is defined\n" if defined @{$entry};
    print "\thash   is defined\n" if defined %{$entry};
    print "\tsub    is defined\n" if defined &{$entry};
}

Answer 2

就是这样.感谢MGoDave和kbosak在我面前提供答案,我看起来太傻了(我看着%main ::开始,但错过了他们没有他们的印记).这是完整的代码:

#!/usr/bin/perl

use strict;
use warnings;

use PadWalker qw/peek_our peek_my/;
use Data::Dumper;

our $foo = 1;
our $bar = 2;

{
    my $foo = 3;
    print Dumper in_scope_variables();
}

print Dumper in_scope_variables();

sub in_scope_variables {
    my %in_scope = %{peek_our(1)};
    my $lexical  = peek_my(1);
    for my $name (keys %main::) {
        my $glob = $main::{$name};
        if (defined ${$glob}) {
            $in_scope{'$' . $name} = ${$glob};
        }

        if (defined @{$glob}) {
            $in_scope{'@' . $name} = [@{$glob}];
        }

        if (defined %{$glob}) {
            $in_scope{'%' . $name} = {%{$glob}};
        }
    }

    #lexicals hide package variables
    while (my ($var, $ref) = each %$lexical) {
        $in_scope{$var} = $ref;
    }
    return \%in_scope;
}

Answer 3

您可以执行以下操作来检查主程序包的符号表:

{
    no strict 'refs';

    for my $var (keys %{'main::'}) {
        print "$var\n";
    }
}