form.pm

1. 记录每个帖子的访问人情况

}


=item $form->dump

Returns a textual representation of the form.  Mainly useful for
debugging.  If called in void context, then the dump is printed on
STDERR.

=cut

sub dump
{
    my $self = shift;
    my $method  = $self->{'method'};
    my $uri     = $self->{'action'};
    my $enctype = $self->{'enctype'};
    my $dump = "$method $uri";
    $dump .= " ($enctype)"
	if $enctype eq "application/xxx-www-form-urlencoded";
    $dump .= "\n";
    for ($self->inputs) {
	$dump .= "  " . $_->dump . "\n";
    }
    print STDERR $dump unless defined wantarray;
    $dump;
}


#---------------------------------------------------
package HTML::Form::Input;

=back

=head1 INPUTS

An C<HTML::Form> contains a sequence of inputs.  References to the
inputs can be obtained with the $form->inputs or $form->find_input
methods.  Once you have such a reference, then one of the following
methods can be used on it:

=over 4

=cut

sub new
{
    my $class = shift;
    my $self = bless {@_}, $class;
    $self;
}

sub add_to_form
{
    my($self, $form) = @_;
    push(@{$form->{'inputs'}}, $self);
    $self;
}

sub fixup {}


=item $input->type

Returns the type of this input.  Types are stuff like "text",
"password", "hidden", "textarea", "image", "submit", "radio",
"checkbox", "option"...

=cut

sub type
{
    shift->{type};
}

=item $input->name([$new])

=item $input->value([$new])

These methods can be used to set/get the current name or value of an
input.  If the input only can take an enumerated list of values, then
it is an error to try to set it to something else and the method will
croak if you try.

=cut

sub name
{
    my $self = shift;
    my $old = $self->{name};
    $self->{name} = shift if @_;
    $old;
}

sub value
{
    my $self = shift;
    my $old = $self->{value};
    $self->{value} = shift if @_;
    $old;
}

=item $input->possible_values

Returns a list of all values that and input can take.  For inputs that
does not have discrete values this returns an empty list.

=cut

sub possible_values
{
    return;
}

=item $input->other_possible_values

Returns a list of all values not tried yet.

=cut

sub other_possible_values
{
    return;
}

=item $input->form_name_value

Returns a (possible empty) list of key/value pairs that should be
incorporated in the form value from this input.

=cut

sub form_name_value
{
    my $self = shift;
    my $name = $self->{'name'};
    return unless defined $name;
    my $value = $self->value;
    return unless defined $value;
    return ($name => $value);
}

sub dump
{
    my $self = shift;
    my $name = $self->name;
    $name = "<NONAME>" unless defined $name;
    my $value = $self->value;
    $value = "<UNDEF>" unless defined $value;
    my $dump = "$name=$value";

    my $type = $self->type;
    return $dump if $type eq "text";

    $type = ($type eq "text") ? "" : " ($type)";
    my $menu = $self->{menu} || "";
    if ($menu) {
	my @menu;
	for (0 .. @$menu-1) {
	    my $opt = $menu->[$_];
	    $opt = "<UNDEF>" unless defined $opt;
	    substr($opt,0,0) = "*" if $self->{seen}[$_];
	    push(@menu, $opt);
	}
	$menu = "[" . join("|", @menu) . "]";
    }
    sprintf "%-30s %-10s %s", $dump, $type, $menu;
}


#---------------------------------------------------
package HTML::Form::TextInput;
@HTML::Form::TextInput::ISA=qw(HTML::Form::Input);

#input/text
#input/password
#input/file
#input/hidden
#textarea

sub value
{
    my $self = shift;
    if (@_) {
	if (exists($self->{readonly}) || $self->{type} eq "hidden") {
	    Carp::carp("Input '$self->{name}' is readonly") if $^W;
	}
    }
    $self->SUPER::value(@_);
}

#---------------------------------------------------
package HTML::Form::IgnoreInput;
@HTML::Form::IgnoreInput::ISA=qw(HTML::Form::Input);

#input/button
#input/reset

sub value { return }


#---------------------------------------------------
package HTML::Form::ListInput;
@HTML::Form::ListInput::ISA=qw(HTML::Form::Input);

#select/option   (val1, val2, ....)
#input/radio     (undef, val1, val2,...)
#input/checkbox  (undef, value)

sub new
{
    my $class = shift;
    my $self = $class->SUPER::new(@_);
    if ($self->type eq "checkbox") {
	my $value = delete $self->{value};
	$value = "on" unless defined $value;
	$self->{menu} = [undef, $value];
	$self->{current} = (exists $self->{checked}) ? 1 : 0;
	delete $self->{checked};
    } else {
	$self->{menu} = [delete $self->{value}];
	my $checked = exists $self->{checked} || exists $self->{selected};
	delete $self->{checked};
	delete $self->{selected};
	if (exists $self->{multiple}) {
	    unshift(@{$self->{menu}}, undef);
	    $self->{current} = $checked ? 1 : 0;
	} else {
	    $self->{current} = 0 if $checked;
	}
    }
    $self;
}

sub add_to_form
{
    my($self, $form) = @_;
    my $type = $self->type;
    return $self->SUPER::add_to_form($form)
	if $type eq "checkbox" ||
	   ($type eq "option" && exists $self->{multiple});

    my $prev = $form->find_input($self->{name}, $self->{type});
    return $self->SUPER::add_to_form($form) unless $prev;

    # merge menues
    push(@{$prev->{menu}}, @{$self->{menu}});
    $prev->{current} = @{$prev->{menu}} - 1 if exists $self->{current};
}

sub fixup
{
    my $self = shift;
    if ($self->{type} eq "option" && !(exists $self->{current})) {
	$self->{current} = 0;
    }
    $self->{seen} = [(0) x @{$self->{menu}}];
    $self->{seen}[$self->{current}] = 1 if exists $self->{current};
}

sub value
{
    my $self = shift;
    my $old;
    $old = $self->{menu}[$self->{current}] if exists $self->{current};
    if (@_) {
	my $i = 0;
	my $val = shift;
	my $cur;
	for (@{$self->{menu}}) {
	    if ((defined($val) && defined($_) && $val eq $_) ||
		(!defined($val) && !defined($_))
	       )
	    {
		$cur = $i;
		last;
	    }
	    $i++;
	}
	Carp::croak("Illegal value '$val'") unless defined $cur;
	$self->{current} = $cur;
	$self->{seen}[$cur] = 1;
    }
    $old;
}

sub possible_values
{
    my $self = shift;
    @{$self->{menu}};
}

sub other_possible_values
{
    my $self = shift;
    map { $self->{menu}[$_] }
        grep {!$self->{seen}[$_]}
             0 .. (@{$self->{seen}} - 1);
}


#---------------------------------------------------
package HTML::Form::SubmitInput;
@HTML::Form::SubmitInput::ISA=qw(HTML::Form::Input);

#input/image
#input/submit

=item $input->click($form, $x, $y)

Some input types (currently "sumbit" buttons and "images") can be
clicked to submit the form.  The click() method returns the
corrsponding C<HTTP::Request> object.

=cut

sub click
{
    my($self,$form,$x,$y) = @_;
    for ($x, $y) { $_ = 1 unless defined; }
    local($self->{clicked}) = [$x,$y];
    return $form->make_request;
}

sub form_name_value
{
    my $self = shift;
    return unless $self->{clicked};
    return $self->SUPER::form_name_value(@_);
}


#---------------------------------------------------
package HTML::Form::ImageInput;
@HTML::Form::ImageInput::ISA=qw(HTML::Form::SubmitInput);

sub form_name_value
{
    my $self = shift;
    my $clicked = $self->{clicked};
    return unless $clicked;
    my $name = $self->{name};
    return unless defined $name;
    return ("$name.x" => $clicked->[0],
	    "$name.y" => $clicked->[1]
	   );
}

1;

__END__

=back

=head1 SEE ALSO

L<LWP>, L<HTML::Parser>, L<webchatpp>

=head1 COPYRIGHT

Copyright 1998-2000 Gisle Aas.

This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

=cut