ch03.016_prob

来自「Perl Best Practices the source code」· 016_PROB 代码 · 共 45 行

##############################################################################
## Code fragment (NOT RECOMMENDED) from Chapter 3 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;

my @metadata;
my $next_record;

sub ok;
sub metadata;
sub end_tag;
 
my $done;
my $bad;
 
# and later...
 
if (ok($next_record) && !$done) {               # Ok in what sense? What is done?
    METADATA:
    while (metadata($next_record)) {            # Metadata exists? Defined? True?
        push @metadata, get_metadata_for($next_record);
        last METADATA if end_tag($next_record);  # Does this set an end tag?
    }
}
else {
    $bad = 1;                                   # What's bad? In what way?
}


sub ok {}
sub metadata {}
sub end_tag {}