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    &{$filter};
    $this->set_value($_);
}

#
# Attribute access
#

sub is_read_only
{
    my $this = shift;
    return $this->{is_read_only};
}

#
# High-level classification predicates
#

sub is_input
{
    return 1;
}

#
# Predicates for the Input hierarchy
#

sub is_field
{
    return 0;
}

sub is_area
{
    return 0;
}

sub is_password
{
    return 0;
}

sub is_file
{
    return 0;
}

1;

=head1 NAME

CGI::Test::Form::Widget::Input - Abstract representation of an input field

=head1 SYNOPSIS

 # Inherits from CGI::Test::Form::Widget

=head1 DESCRIPTION

This class is the abstract representation of a text input field, i.e. a
text field, a password field, a file upload field or a text area.

To simulate user input in those fields, there are a set of routines to
C<prepend()>, C<append()>, C<replace()>, C<clear()> or even run existing text
through C<filter()>.

=head1 INTERFACE

The interface is the same as the one described in L<CGI::Test::Form::Widget>,
with the following additions:

=head2 Attribute Setting

There are a number of convenience routines that are wrappers on C<set_value()>:

=over 4

=item C<append> I<string>

Appends the I<string> text to the existing text.

=item C<clear>

Clears existing text.

=item C<filter> I<filter_routine>

Runs existing text through the given I<filter_routine>.  The C<$_> variable
is set to the whole text value, and is made available to the filter.
Hence you may write:

    $input->filter(sub { s/this/that/g });

to replace all instances of C<this> by C<that> within the input text.

=item C<prepend> I<string>

Prepends the I<string> text to the existing text.

=item C<replace> I<string>

Replaces the existing text with I<string>.

=back

=head2 Widget Classification Predicates

There are additional predicates to distinguish between the various
input fields:

=over 4

=item C<is_area>

Returns I<true> for a text area.

=item C<is_field>

Returns I<true> for a pure text field.

=item C<is_file>

Returns I<true> for a file upload field (text field with browser support for
file selection).

=item C<is_password>

Returns I<true> for a password field (text field with input masked by GUI).

=back

=head1 AUTHORS

The original author is Raphael Manfredi.

Steven Hilton was long time maintainer of this module.

Current maintainer is Alexander Tokarev F<E<lt>tokarev@cpan.orgE<gt>>.

=head1 SEE ALSO

CGI::Test::Form::Widget(3),
CGI::Test::Form::Widget::Input::File(3),
CGI::Test::Form::Widget::Input::Password(3),
CGI::Test::Form::Widget::Input::Text_Area(3),
CGI::Test::Form::Widget::Input::Text_Field(3).

=cut