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package # hide from PAUSE indexer
Calculator;
use strict;
use warnings;
use Moose;
has 'left' => ( is => 'rw', isa => 'Num', default => 0 );
has 'right' => ( is => 'rw', isa => 'Str', default => '' );
has 'operator' => ( is => 'rw', isa => 'Str', default => '+' );
has 'display' => ( is => 'rw', isa => 'Str', default => '0' );
has 'equals' => ( is => 'rw', isa => 'Str', default => '' );
sub key_in {
my ( $self, $seq ) = @_;
my @possible = grep {/\S/} split(//, $seq);
$self->press($_) for @possible;
}
sub press {
my ( $self, $key ) = @_;
# Numbers
$self->digit( $1 ) if $key =~ m/^([\d\.])$/;
# Operators
$self->key_operator( $1 ) if $key =~ m/^([\+\-\/\*])$/;
# Equals
$self->equalsign if $key eq '=';
# Clear
$self->clear if $key eq 'C';
}
sub clear {
my $self = shift;
$self->left(0);
$self->right('');
$self->operator('+');
$self->display('0');
$self->equals('');
}
sub equalsign {
my $self = shift;
$self->key_operator('+');
my $result = $self->left;
$self->clear();
$self->equals( $result );
$self->display( $result );
}
sub digit {
my ( $self, $digit ) = @_;
# Deal with decimal weirdness
if ( $digit eq '.' ) {
return if $self->right =~ m/\./;
$digit = '0.' unless length( $self->right );
}
$self->right( $self->right . $digit );
$self->display( $self->right );
}
sub key_operator {
my ( $self, $operator ) = @_;
my $cmd = $self->left . $self->operator .
( length($self->right) ? $self->right :
( length( $self->equals ) ? $self->equals : '0'));
$self->right('');
$self->equals('');
$self->left( (eval $cmd) + 0 );
$self->display( $self->left );
$self->operator( $operator );
}
1;
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