ch06.074_prob

Perl Best Practices the source code

##############################################################################
## Code fragment (NOT RECOMMENDED) from Chapter 6 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{};

sub words_to_num {
    my ($words) = @_;
    
    # Treat each sequence of non-whitespace as a word...
    my @words = split /\s+/, $words;
 
    # Translate each word to the appropriate number...
    my $num = $EMPTY_STR;
    for my $word (@words) {
        if ($word =~ m/ zero | z閞o /ixms) {
            $num .= '0';
        }
        elsif ($word =~ m/ one | un | une /ixms) {
            $num .= '1';
        }
        elsif ($word =~ m/ two | deux /ixms) {
            $num .= '2';
        }
        elsif ($word =~ m/ three | trois /ixms) {
            $num .= '3';
        }
        elsif ($word =~ m/ four | quatre /ixms) {
            $num .= '4';
        }
        elsif ($word =~ m/ five | cinq /ixms) {
            $num .= '5';
        }
        elsif ($word =~ m/ six | sixe /ixms) {
            $num .= '6';
        }
        elsif ($word =~ m/ seven | sept /ixms) {
            $num .= '7';
        }
        elsif ($word =~ m/ eight | huit /ixms) {
            $num .= '8';
        }
        elsif ($word =~ m/ nine | neuf /ixms) {
            $num .= '9';
        }
        else {
            # Ignore unrecognized words
        }
    }
 
    return $num;
}
 
# and later...
 
print words_to_num('one zero eight neuf');    # prints: 1089