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.\" ========================================================================
.\"
.IX Title "Template::Filters 3"
.TH Template::Filters 3 "2014-04-24" "perl v5.16.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Template::Filters \- Post\-processing filters for template blocks
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use Template::Filters;
\&    
\&    $filters = Template::Filters\->new(\e%config);
\&    
\&    ($filter, $error) = $filters\->fetch($name, \e@args, $context);
\&    
\&    if ($filter) {
\&        print &$filter("some text");
\&    }
\&    else {
\&        print "Could not fetch $name filter: $error\en";
\&    }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \f(CW\*(C`Template::Filters\*(C'\fR module implements a provider for creating subroutines
that implement the standard filters. Additional custom filters may be provided
via the \s-1FILTERS\s0 configuration option.
.SH "METHODS"
.IX Header "METHODS"
.SS "new(\e%params)"
.IX Subsection "new(%params)"
Constructor method which instantiates and returns a reference to a
\&\f(CW\*(C`Template::Filters\*(C'\fR object.  A reference to a hash array of configuration
items may be passed as a parameter.  These are described below.
.PP
.Vb 3
\&    my $filters = Template::Filters\->new({
\&        FILTERS => { ... },
\&    });
\&    
\&    my $template = Template\->new({
\&        LOAD_FILTERS => [ $filters ],
\&    });
.Ve
.PP
A default \f(CW\*(C`Template::Filters\*(C'\fR module is created by the Template module
if the \s-1LOAD_FILTERS\s0 option isn't specified.  All configuration parameters
are forwarded to the constructor.
.PP
.Vb 3
\&    $template = Template\->new({
\&        FILTERS => { ... },
\&    });
.Ve
.ie n .SS "fetch($name, \e@args, $context)"
.el .SS "fetch($name, \e@args, \f(CW$context\fP)"
.IX Subsection "fetch($name, @args, $context)"
Called to request that a filter of a given name be provided.  The name
of the filter should be specified as the first parameter.  This should
be one of the standard filters or one specified in the \s-1FILTERS\s0
configuration hash.  The second argument should be a reference to an
array containing configuration parameters for the filter.  This may be
specified as 0, or undef where no parameters are provided.  The third
argument should be a reference to the current Template::Context
object.
.PP
The method returns a reference to a filter sub-routine on success.  It
may also return \f(CW\*(C`(undef, STATUS_DECLINE)\*(C'\fR to decline the request, to allow
delegation onto other filter providers in the \s-1LOAD_FILTERS\s0 chain of 
responsibility.  On error, \f(CW\*(C`($error, STATUS_ERROR)\*(C'\fR is returned where \f(CW$error\fR
is an error message or Template::Exception object indicating the error
that occurred.
.PP
When the \f(CW\*(C`TOLERANT\*(C'\fR option is set, errors are automatically downgraded to
a \f(CW\*(C`STATUS_DECLINE\*(C'\fR response.
.SS "\fIuse_html_entities()\fP"
.IX Subsection "use_html_entities()"
This class method can be called to configure the \f(CW\*(C`html_entity\*(C'\fR filter to use
the HTML::Entities module. An error will be raised if it is not installed
on your system.
.PP
.Vb 2
\&    use Template::Filters;
\&    Template::Filters\->use_html_entities();
.Ve
.SS "\fIuse_apache_util()\fP"
.IX Subsection "use_apache_util()"
This class method can be called to configure the \f(CW\*(C`html_entity\*(C'\fR filter to use
the Apache::Util module. An error will be raised if it is not installed on
your system.
.PP
.Vb 2
\&    use Template::Filters;
\&    Template::Filters\->use_apache_util();
.Ve
.SS "\fIuse_rfc2732()\fP"
.IX Subsection "use_rfc2732()"
This class method can be called to configure the \f(CW\*(C`uri\*(C'\fR and \f(CW\*(C`url\*(C'\fR filters to 
use the older \s-1RFC2732\s0 standard for matching unsafe characters.
.SS "\fIuse_rfc3986()\fP"
.IX Subsection "use_rfc3986()"
This class method can be called to configure the \f(CW\*(C`uri\*(C'\fR and \f(CW\*(C`url\*(C'\fR filters to 
use the newer \s-1RFC3986\s0 standard for matching unsafe characters.
.SH "CONFIGURATION OPTIONS"
.IX Header "CONFIGURATION OPTIONS"
The following list summarises the configuration options that can be provided
to the \f(CW\*(C`Template::Filters\*(C'\fR \fInew()\fR constructor. Please see
Template::Manual::Config for further information about each option.
.SS "\s-1FILTERS\s0"
.IX Subsection "FILTERS"
The \s-1FILTERS\s0 option can be used to specify
custom filters which can then be used with the
\&\s-1FILTER\s0 directive like any other. These
are added to the standard filters which are available by default.
.PP
.Vb 6
\&    $filters = Template::Filters\->new({
\&        FILTERS => {
\&            \*(Aqsfilt1\*(Aq =>   \e&static_filter,
\&            \*(Aqdfilt1\*(Aq => [ \e&dyanamic_filter_factory, 1 ],
\&        },
\&    });
.Ve
.SS "\s-1TOLERANT\s0"
.IX Subsection "TOLERANT"
The \s-1TOLERANT\s0 flag can be set to indicate
that the \f(CW\*(C`Template::Filters\*(C'\fR module should ignore any errors and instead
return \f(CW\*(C`STATUS_DECLINED\*(C'\fR.
.SS "\s-1DEBUG\s0"
.IX Subsection "DEBUG"
The \s-1DEBUG\s0 option can be used to enable
debugging messages for the Template::Filters module by setting it to include
the \f(CW\*(C`DEBUG_FILTERS\*(C'\fR value.
.PP
.Vb 1
\&    use Template::Constants qw( :debug );
\&    
\&    my $template = Template\->new({
\&        DEBUG => DEBUG_FILTERS | DEBUG_PLUGINS,
\&    });
.Ve
.SH "STANDARD FILTERS"
.IX Header "STANDARD FILTERS"
Please see Template::Manual::Filters for a list of the filters provided
with the Template Toolkit, complete with examples of use.
.SH "AUTHOR"
.IX Header "AUTHOR"
Andy Wardley <abw@wardley.org> <http://wardley.org/>
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (C) 1996\-2014 Andy Wardley.  All Rights Reserved.
.PP
This module is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Template::Manual::Filters, Template, Template::Context