如何列出给定范围内的所有变量? [英] How can I list all variables that are in a given scope?

问题描述

我知道我可以使用 Padwalker 的peek_our和peek_my，但是如何获取所有全局变量(如$"和$/)的名称和值?

I know I can list all of the package and lexcial variables in a given scope using Padwalker's peek_our and peek_my, but how can I get the names and values of all of the global variables like $" and $/?

#!/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;
}

推荐答案

您可以访问符号表，签出p. "Programming Perl"的293 另请参阅"Mastering Perl: http://www252.pair.com/comdog/mastering_perl/ 具体来说: http://www252.pair.com/comdog/mastering_perl/章/08.symbol_tables.html

You can access the symbol table, check out p. 293 of "Programming Perl" Also look at "Mastering Perl: http://www252.pair.com/comdog/mastering_perl/ Specifically: http://www252.pair.com/comdog/mastering_perl/Chapters/08.symbol_tables.html

您要查找的变量将位于主命名空间下

Those variables you are looking for will be under the main namespace

快速的Google搜索给了我

A quick Google search gave me:

{
    no strict 'refs';

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

您也可以

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

以及其他值

如果要查找符号的类型，可以做(通过掌握perl):

If you want to find the type of the symbol you can do (from mastering 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};
}

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