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File Name : Filter.pm

#============================================================= -*-Perl-*-
#
# Template::Plugin::Filter
#
# DESCRIPTION
#   Template Toolkit module implementing a base class plugin
#   object which acts like a filter and can be used with the
#   FILTER directive.
#
# AUTHOR
#   Andy Wardley   <abw@wardley.org>
#
# COPYRIGHT
#   Copyright (C) 2001-2022 Andy Wardley.  All Rights Reserved.
#
#   This module is free software; you can redistribute it and/or
#   modify it under the same terms as Perl itself.
#
#============================================================================

package Template::Plugin::Filter;

use strict;
use warnings;
use base 'Template::Plugin';
use Scalar::Util 'weaken', 'isweak';

our $VERSION = '3.100';
our $DYNAMIC = 0 unless defined $DYNAMIC;

sub new {
    my ($class, $context, @args) = @_;
    my $config = @args && ref $args[-1] eq 'HASH' ? pop(@args) : { };

# look for $DYNAMIC
    my $dynamic;
    {
        no strict 'refs';
        $dynamic = ${"$class\::DYNAMIC"};
    }
    $dynamic = $DYNAMIC unless defined $dynamic;

my $self = bless {
        _CONTEXT => $context,
        _DYNAMIC => $dynamic,
        _ARGS    => \@args,
        _CONFIG  => $config,
    }, $class;

return $self->init($config)
        || $class->error($self->error());
}

sub init {
    my ($self, $config) = @_;
    return $self;
}

sub factory {
    my $self = shift;
    my $this = $self;

# avoid a memory leak
    weaken( $this->{_CONTEXT} ) if ref $this->{_CONTEXT}
            && !isweak $this->{_CONTEXT};

if ($self->{ _DYNAMIC }) {
        return [ sub {
            my ($context, @args) = @_;
            my $config = ref $args[-1] eq 'HASH' ? pop(@args) : { };

return sub {
                $this->filter(shift, \@args, $config);
            };
        }, 1 ];
    }
    else {
        return sub {
            $this->filter(shift);
        };
    }
}

sub filter {
    my ($self, $text, $args, $config) = @_;
    return $text;
}

sub merge_config {
    my ($self, $newcfg) = @_;
    my $owncfg = $self->{ _CONFIG };
    return $owncfg unless $newcfg;
    return { %$owncfg, %$newcfg };
}

sub merge_args {
    my ($self, $newargs) = @_;
    my $ownargs = $self->{ _ARGS };
    return $ownargs unless $newargs;
    return [ @$ownargs, @$newargs ];
}

sub install_filter {
    my ($self, $name) = @_;
    $self->{ _CONTEXT }->define_filter( $name => $self->factory );
    return $self;
}

__END__

=head1 NAME

Template::Plugin::Filter - Base class for plugin filters

=head1 SYNOPSIS

package MyOrg::Template::Plugin::MyFilter;

use Template::Plugin::Filter;
    use base qw( Template::Plugin::Filter );

sub filter {
        my ($self, $text) = @_;

# ...mungify $text...

return $text;
    }

# now load it...
    [% USE MyFilter %]

# ...and use the returned object as a filter
    [% FILTER $MyFilter %]
      ...
    [% END %]

=head1 DESCRIPTION

This module implements a base class for plugin filters.  It hides
the underlying complexity involved in creating and using filters
that get defined and made available by loading a plugin.

To use the module, simply create your own plugin module that is
inherited from the C<Template::Plugin::Filter> class.

package MyOrg::Template::Plugin::MyFilter;

use Template::Plugin::Filter;
    use base qw( Template::Plugin::Filter );

Then simply define your C<filter()> method.  When called, you get
passed a reference to your plugin object (C<$self>) and the text
to be filtered.

sub filter {
        my ($self, $text) = @_;

# ...mungify $text...

return $text;
    }

To use your custom plugin, you have to make sure that the Template
Toolkit knows about your plugin namespace.

my $tt2 = Template->new({
        PLUGIN_BASE => 'MyOrg::Template::Plugin',
    });

Or for individual plugins you can do it like this:

my $tt2 = Template->new({
        PLUGINS => {
            MyFilter => 'MyOrg::Template::Plugin::MyFilter',
        },
    });

Then you C<USE> your plugin in the normal way.

[% USE MyFilter %]

The object returned is stored in the variable of the same name,
'C<MyFilter>'.  When you come to use it as a C<FILTER>, you should add
a dollar prefix.  This indicates that you want to use the filter
stored in the variable 'C<MyFilter>' rather than the filter named
'C<MyFilter>', which is an entirely different thing (see later for
information on defining filters by name).

[% FILTER $MyFilter %]
       ...text to be filtered...
    [% END %]

You can, of course, assign it to a different variable.

[% USE blat = MyFilter %]

[% FILTER $blat %]
       ...text to be filtered...
    [% END %]

Any configuration parameters passed to the plugin constructor from the
C<USE> directive are stored internally in the object for inspection by
the C<filter()> method (or indeed any other method).  Positional
arguments are stored as a reference to a list in the C<_ARGS> item while
named configuration parameters are stored as a reference to a hash
array in the C<_CONFIG> item.

For example, loading a plugin as shown here:

[% USE blat = MyFilter 'foo' 'bar' baz = 'blam' %]

would allow the C<filter()> method to do something like this:

sub filter {
        my ($self, $text) = @_;

my $args = $self->{ _ARGS   };  # [ 'foo', 'bar' ]
        my $conf = $self->{ _CONFIG };  # { baz => 'blam' }

# ...munge $text...

return $text;
    }

By default, plugins derived from this module will create static
filters.  A static filter is created once when the plugin gets
loaded via the C<USE> directive and re-used for all subsequent
C<FILTER> operations.  That means that any argument specified with
the C<FILTER> directive are ignored.

Dynamic filters, on the other hand, are re-created each time
they are used by a C<FILTER> directive.  This allows them to act
on any parameters passed from the C<FILTER> directive and modify
their behaviour accordingly.

There are two ways to create a dynamic filter.  The first is to
define a C<$DYNAMIC> class variable set to a true value.

package MyOrg::Template::Plugin::MyFilter;
    use base 'Template::Plugin::Filter';
    our $DYNAMIC = 1;

The other way is to set the internal C<_DYNAMIC> value within the C<init()>
method which gets called by the C<new()> constructor.

sub init {
        my $self = shift;
        $self->{ _DYNAMIC } = 1;
        return $self;
    }

When this is set to a true value, the plugin will automatically
create a dynamic filter.  The outcome is that the C<filter()> method
will now also get passed a reference to an array of positional
arguments and a reference to a hash array of named parameters.

So, using a plugin filter like this:

[% FILTER $blat 'foo' 'bar' baz = 'blam' %]

would allow the C<filter()> method to work like this:

sub filter {
        my ($self, $text, $args, $conf) = @_;

# $args = [ 'foo', 'bar' ]
        # $conf = { baz => 'blam' }
    }

In this case can pass parameters to both the USE and FILTER directives,
so your filter() method should probably take that into account.

[% USE MyFilter 'foo' wiz => 'waz' %]

[% FILTER $MyFilter 'bar' biz => 'baz' %]
       ...
    [% END %]

You can use the C<merge_args()> and C<merge_config()> methods to do a quick
and easy job of merging the local (e.g. C<FILTER>) parameters with the
internal (e.g. C<USE>) values and returning new sets of conglomerated
data.

sub filter {
        my ($self, $text, $args, $conf) = @_;

$args = $self->merge_args($args);
        $conf = $self->merge_config($conf);

# $args = [ 'foo', 'bar' ]
        # $conf = { wiz => 'waz', biz => 'baz' }
        ...
    }

You can also have your plugin install itself as a named filter by
calling the C<install_filter()> method from the C<init()> method.  You
should provide a name for the filter, something that you might
like to make a configuration option.

sub init {
        my $self = shift;
        my $name = $self->{ _CONFIG }->{ name } || 'myfilter';
        $self->install_filter($name);
        return $self;
    }

This allows the plugin filter to be used as follows:

[% USE MyFilter %]

[% FILTER myfilter %]
       ...
    [% END %]

[% USE MyFilter name = 'swipe' %]

[% FILTER swipe %]
       ...
    [% END %]

Alternately, you can allow a filter name to be specified as the
first positional argument.

sub init {
        my $self = shift;
        my $name = $self->{ _ARGS }->[0] || 'myfilter';
        $self->install_filter($name);
        return $self;
    }

[% USE MyFilter 'swipe' %]

[% FILTER swipe %]
       ...
    [% END %]

=head1 EXAMPLE

Here's a complete example of a plugin filter module.

package My::Template::Plugin::Change;
    use Template::Plugin::Filter;
    use base qw( Template::Plugin::Filter );

sub init {
        my $self = shift;

$self->{ _DYNAMIC } = 1;

# first arg can specify filter name
        $self->install_filter($self->{ _ARGS }->[0] || 'change');

return $self;
    }

sub filter {
        my ($self, $text, $args, $config) = @_;

$config = $self->merge_config($config);
        my $regex = join('|', keys %$config);

$text =~ s/($regex)/$config->{ $1 }/ge;

return $text;
    }

=head1 AUTHOR

Andy Wardley E<lt>abw@wardley.orgE<gt> L<http://wardley.org/>

=head1 COPYRIGHT

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

=head1 SEE ALSO

L<Template::Plugin>, L<Template::Filters>, L<Template::Manual::Filters>

=cut

# Local Variables:
# mode: perl
# perl-indent-level: 4
# indent-tabs-mode: nil
# End:
#
# vim: expandtab shiftwidth=4:

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.	dir	-	0755	2024-03-03 10:16:37
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