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/usr/share/perl5/Template/Provider/FromDATA.pm is in libtemplate-provider-fromdata-perl 0.13-1.

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package Template::Provider::FromDATA;

use base qw( Template::Provider Class::Accessor::Fast );

use strict;
use warnings;

use Template::Constants;

=head1 NAME

Template::Provider::FromDATA - Load templates from your __DATA__ section

=head1 SYNOPSIS

    use Template;
    use Template::Provider::FromDATA;
    
    # Create the provider
    my $provider = Template::Provider::FromDATA->new( {
        CLASSES => __PACKAGE__
    } );
    
    # Add the provider to the config
    my $template = Template->new( {
        # ...
        LOAD_TEMPLATES => [ $provider ]
    } );

    # Render a template
    $template->process( 'mytemplate', { bar => 'Bar' } );

    # ...and now the templates
    
    __DATA__
    
    __mytemplate__
    Foo [% bar %]
    
    __myothertemplate__
    Baz, [% qux %]?

=head1 DESCRIPTION

This module allows you to store your templates inline with your
code in the C<__DATA__> section. It will search any number of classes
specified.

=head1 CAVEAT

If you have two templates with the same name, this module will not understand
the difference, it will simply return the first one found. If you wish, you
can specify a fully qualified template name by prefixing the template with the
module name (using C<-> instead of C<::> as a namespace separator), adding
a C</> to separate the module name from the template name.

    $template->process( 'My-Templates/mytemplate', { bar => 'Bar' } );

=head1 INSTALLATION

    perl Makefile.PL
    make
    make test
    make install

=cut

__PACKAGE__->mk_accessors( qw( cache classes ) );

our $VERSION = '0.13';

=head1 METHODS

=head2 new( \%OPTIONS )

Create a new instance of the provider. You can specify a list of classes to 
be searched for templates via the C<CLASSES> option. By omitting this option 
it will search C<main>.

    # defaults to 'main'
    $provider = Template::Provider::FromDATA->new;
    
    # look for templates in 'Foo'
    $provider = Template::Provider::FromDATA->new( {
        CLASSES => 'Foo'
    } );

    # look for templates in 'Foo::Bar' and 'Foo::Baz'
    $provider = Template::Provider::FromDATA->new( {
        CLASSES => [ 'Foo::Bar', 'Foo::Baz' ]
    } );

By default, template data is lazy-loaded as they it is  requested. If you
wish to load up all template data upon initializtion, you can use the 
C<PRELOAD> option.

    $provider = Template::Provider::FromDATA->new( {
        PRELOAD => 1
    } );

=head2 _init( \%OPTIONS )

A subclassed method to handle the options passed to C<new()>.

=cut

sub _init {
    my( $self, $args ) = @_;
    my $classes = delete $args->{ CLASSES };
    $classes ||= [ 'main' ];
    $classes   = [ $classes ] if not ref $classes;
    
    for( @$classes ) {
        eval "require $_";
    }

    $self->classes( $classes );
    $self->cache( { classes => {}, templates => {} } );

    if( delete $args->{ PRELOAD } ) {
        $self->_cache_class( $_ ) for @$classes;
    }

    return $self->SUPER::_init;
}

=head2 fetch( $name )

This is a subclassed method that will load a template via C<_fetch()>
if a non-reference argument is passed.

=cut

sub fetch {
    my( $self, $name  ) = @_;

    return undef, Template::Constants::STATUS_DECLINED if ref $name;

    my( $data, $error ) = $self->_fetch( $name );    
    return $data, $error;
}

=head2 _load( $name )

Loads the template via the C<get_file()> sub and sets some cache
information.

=cut

sub _load {
    my( $self, $name ) = @_;
    my $data    = {};
    my $classes = $self->classes;
    my( $content, $error );

    # handle fully qualified names
    if( $name =~ m{/} ) {
        my( $class, $template ) = split( m{/}, $name, 2 );
        $class   =~ s{-}{::}g;
        $classes = [ $class ];
        $name    = $template;
    }

    for my $class ( @$classes ) {
        $content = $self->get_file( $class, $name );
        last if $content;
    }

    my $time = time;
    $data->{ time } = $time;
    $data->{ load } = $time;
    $data->{ name } = $name;
    $data->{ text } = $content;

    $error = Template::Constants::STATUS_DECLINED if !$content;

    return $data, $error;
}

=head2 get_file( $class, $template )

This method searches through C<$class> for a template
named C<$template>. Returns the contents on success, undef
on failure.

This function was mostly borrowed from L<Catalyst::Helper>'s
C<get_file> function.

=cut

sub get_file {
    my( $self, $class, $template ) = @_;

    my $cache = $self->cache;
    my $key   = "${class}/${template}";

    $self->_cache_class( $class ) unless $cache->{ classes }->{ $class };

    if( exists $cache->{ templates }->{ $key } ) {
        return $cache->{ templates }->{ $key };
    }

    return undef;
}

sub _cache_class {
    my( $self, $class ) = @_;

    my $cache = $self->cache;

    return if $cache->{ classes }->{ $class };

    no strict 'refs';
    my $fh  = \*{"${class}\::DATA"};
    my $pos = tell( $fh );
    my $filecache = do { local $/; <$fh>; };
    seek( $fh, $pos, 0 );
    $cache->{ classes }->{ $class }++;

    my @files = split /^__(.+)__\r?\n/m, $filecache;
    shift @files;
    while (@files) {
        my( $name, $content ) = splice @files, 0, 2;
        my $key = "${class}/${name}";
        $cache->{ templates }->{ $key } = $content;
    }
}

=head1 ACCESSORS

=head2 classes

An arrayref of the class names containing our templates.

=head2 cache

A hashref of file and template data.

=head1 AUTHOR

Brian Cassidy E<lt>bricas@cpan.orgE<gt>

=head1 COPYRIGHT AND LICENSE

Copyright 2005-2012 by Brian Cassidy

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

=cut

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