Accents not respected in printing out with data::d

问题:

I would like to print out the content of an associative array. For this I'm using Data::dumper.

So, for exemple, if the associative array is called "%w", I write :

  print OUT Dumper(\%w);

Here's the problem: there are some words like "récente" that are printed out as "r\x{e9}cente".

If I write just :

print OUT %w;

I've no problems, so "récente" it will be printed out as "récente".

All text files used for the script are in utf8. Moreover I use the module "utf8" and I specify always the character encoding system.

For ex. :

open( IN, '<', $file_in);
binmode(IN,":utf8");

I'm pretty sure that the problem is related to Data::dumper. Is there a way to solve this or another way to print out the content of an associative array?

Thank you.

回答1:

This is intentional. The output by Data::Dumper is intended to produce the same data structure when evaluated as Perl code. To limit the effect of character encodings, non-ASCII characters will be dumped using escapes. In addition to that, it's sensible to set $Data::Dumper::Useqq = 1 so that any unprintable characters are dumped using escapes.

Data::Dumper isn't really meant as a way to display data structures – if you have specific formatting requirements, just write the necessary code yourself. For example

use utf8;
use feature 'say';
open my $out, ">:utf8", $filename or die "Can't open $filename: $!";
my %hash = (
    bárewørdş => '–Uni·code–',
);

say { $out } "{";
for my $key (sort keys %hash) {
    say { $out } "  $key: $hash{$key}";
}
say { $out } "}";

produces

{
  bárewørdş: –Uni·code–
}

回答2:

You can also use Data::Dumper::AutoEncode.

use utf8;
use Data::Dumper::AutoEncode;

warn eDumper($hash_ref);

cpan Data::Dumper::AutoEncode

回答3:

This works for me:

use strict;
use warnings;
use Data::Dumper;
$Data::Dumper::Useperl = 1;
binmode STDOUT, ":utf8";
{ no warnings 'redefine';
    sub Data::Dumper::qquote {
        my $s = shift;
        return "'$s'";
    }
}
my $s = "rcente\x{3a3}";
my %w = ($s=>12);
print Dumper(\%w), "\n";

回答4:

Data::Dumper is a debugging tool. It's letting you know what the string contains without making it susceptible to encoding errors. That's not a problem, that's a feature. What it emitted ("r\x{e9}cente") is a sufficiently readable representation of the string you had (72 E9 63 65 6E 74 65).