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lib/DTL/Fast/Tag/Ifchanged.pm  view on Meta::CPAN

            }
            elsif (scalar @{$self->{branches}} > 1)
            {
                $result = $self->{branches}->[1]->render($context);
            }
            else
            {
                $result = '';
            }
        }
        else
        {
            if ($forloop->{first}) # first pass
            {
                $self->update_preserved($context);
                $result = $self->{branches}->[0]->render($context);
            }
            else
            {
                if ($self->watches_changed($context))
                {
                    $result = $self->{branches}->[0]->render($context);
                    $self->update_preserved($context);
                }
                elsif (scalar @{$self->{branches}} > 1)
                {
                    $result = $self->{branches}->[1]->render($context);
                }
            }
        }
    }
    else
    {
        warn "ifchanged tag can be rendered only inside for loop";
    }

    return $result;
}

sub watches_changed
{
    my $self = shift;
    my $context = shift;
    my $result = 0;

    for (my $i = 0; $i < scalar @{$self->{watches}}; $i++)
    {
        my $watch = $self->{watches}->[$i]->render($context);
        my $preserve = $self->{preserved}->[$i];

        if (not DTL::Fast::Expression::Operator::Binary::Eq::dispatch($self, $watch, $preserve))
        {
            $result = 1;
            last;
        }
    }
    return $result;
}


sub update_preserved
{
    my $self = shift;
    my $context = shift;

    $self->{preserved} = [ ];

    foreach my $watch (@{$self->{watches}})
    {
        push @{$self->{preserved}}, $watch->render($context);
    }

    return $self;
}

sub add_branch
{
    my $self = shift;

    $self->{branches} //= [ ];
    push @{$self->{branches}}, DTL::Fast::Renderer->new();
    return $self;
}

1;