ch05.024_prob

来自「Perl Best Practices the source code」· 024_PROB 代码 · 共 47 行

##############################################################################
## Code fragment (NOT RECOMMENDED) from Chapter 5 of "Perl Best Practices"  ##
##     Copyright (c) O'Reilly & Associates, 2005. All Rights Reserved.      ##
##  See: http://www.oreilly.com/pub/a/oreilly/ask_tim/2001/codepolicy.html  ##
##############################################################################


# Standard modules...
use strict;
use warnings;
use IO::Prompt;
use Carp;
use English qw( -no_match_vars );
use Data::Alias;
use Readonly;


sub trimmed_copy_of {
    # Trim explicit arguments...
    if (@_ > 0) {
        my ($string) = @_;
        $string =~ s{\A \s* (.*?) \s* \z}{$1}xms;
        return $string;

    }

    # Otherwise, trim the default argument (i.e. $_)...
    else {
        s{\A \s* (.*?) \s* \z}{$1}xms;
        return $_;
    }
}

my $text = '     This is the text     ';
      $_ = '     More text      ';

use Data::Dumper 'Dumper';
warn Dumper [
    trimmed_copy_of($text)
];

warn Dumper [
    trimmed_copy_of
];

warn Dumper [ $text, $_ ];