ch09.037_best

来自「Perl Best Practices the source code」· 037_BEST 代码 · 共 44 行

##############################################################################
##   Code fragment (Recommended) from Chapter 9 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;

Readonly my $EMPTY_STR => q{};

Readonly my $DEF_WIDTH => 78;
Readonly my $SPACE          => q{ };
 

sub padded {
    my ($text, $arg_ref) = @_;
 
    # Set defaults...
    #            If option given...          Use option           Otherwise,
    #                                                              default

    my $cols   = exists $arg_ref->{cols}   ? $arg_ref->{cols}   : $DEF_WIDTH;
    my $filler = exists $arg_ref->{filler} ? $arg_ref->{filler} : $SPACE;
 
    # Compute left and right spacings...
    my $gap   = $cols - length $text;
    my $left  = $arg_ref->{centered} ? int($gap/2) : 0;
    my $right = $gap - $left;
 
    # Prepend and append space...
    return $filler x $left . $text . $filler x $right;
}


print '[', padded( 'cell' ), "]\n";