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<h1 class="headline">Template::Service</h1>
<h2 class="subhead">General purpose template processing service</h1>
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<li class=""><a href="#SYNOPSIS">SYNOPSIS</a></li>
<li class=""><a href="#DESCRIPTION">DESCRIPTION</a></li>
<li class=""><a href="#METHODS">METHODS</a></li>
<li class="sub"><a href="#method_new">new(\%config)</a></li>
<li class="sub"><a href="#method_process">process($input, \%replace)</a></li>
<li class="sub"><a href="#method_context">context()</a></li>
<li class=""><a href="#CONFIGURATION_OPTIONS">CONFIGURATION OPTIONS</a></li>
<li class="sub"><a href="#section_PRE_PROCESS_POST_PROCESS">PRE_PROCESS, POST_PROCESS</a></li>
<li class="sub"><a href="#section_PROCESS">PROCESS</a></li>
<li class="sub"><a href="#section_ERROR">ERROR</a></li>
<li class="sub"><a href="#section_AUTO_RESET">AUTO_RESET</a></li>
<li class="sub"><a href="#section_DEBUG">DEBUG</a></li>
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<h1 id="SYNOPSIS" onclick="switch_section(this)" title="Click title to show/hide section content.">SYNOPSIS</h1>
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<pre>use Template::Service;
my $service = Template::Service->new({
PRE_PROCESS => [ 'config', 'header' ],
POST_PROCESS => 'footer',
ERROR => {
user => 'user/index.html',
dbi => 'error/database',
default => 'error/default',
},
});
my $output = $service->process($template_name, \%replace)
|| die $service->error(), "\n";</pre>
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<h1 id="DESCRIPTION" onclick="switch_section(this)" title="Click title to show/hide section content.">DESCRIPTION</h1>
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<p>
The <code>Template::Service</code> module implements an object class for
providing a consistent template processing service.
</p>
<p>
Standard header (<a
href="#section_PRE_PROCESS_POST_PROCESS">PRE_PROCESS</a>) and footer (<a
href="#section_PRE_PROCESS_POST_PROCESS">POST_PROCESS</a>) templates may
be specified which are prepended and appended to all templates processed
by the service (but not any other templates or blocks
<code>INCLUDE</code>d or <code>PROCESS</code>ed from within). An <a
href="#section_ERROR">ERROR</a> hash may be specified which redirects the
service to an alternate template file in the case of uncaught exceptions
being thrown. This allows errors to be automatically handled by the
service and a guaranteed valid response to be generated regardless of any
processing problems encountered.
</p>
<p>
A default <code>Template::Service</code> object is created by the <a
href="../../modules/Template.html">Template</a> module. Any
<code>Template::Service</code> options may be passed to the <a href="../../modules/Template.html">Template</a> <a href="../../modules/Template.html#method_new">new()</a> constructor method and
will be forwarded to the <a href="../../modules/Template/Service.html">Template::Service</a> constructor.
</p>
<pre>use Template;
my $template = Template->new({
PRE_PROCESS => 'header',
POST_PROCESS => 'footer',
});</pre>
<p>
Similarly, the <code>Template::Service</code> constructor will forward
all configuration parameters onto other default objects (e.g. <a
href="../../modules/Template/Context.html">Template::Context</a>) that
it may need to instantiate.
</p>
<p>
A <code>Template::Service</code> object (or subclass) can be explicitly
instantiated and passed to the <a href="../../modules/Template.html">Template</a> <a href="../../modules/Template.html#method_new">new()</a> constructor method as the <a
href="#section_SERVICE">SERVICE</a> item.
</p>
<pre>use Template;
use Template::Service;
my $service = Template::Service->new({
PRE_PROCESS => 'header',
POST_PROCESS => 'footer',
});
my $template = Template->new({
SERVICE => $service,
});</pre>
<p>
The <code>Template::Service</code> module can be sub-classed to create
custom service handlers.
</p>
<pre>use Template;
use MyOrg::Template::Service;
my $service = MyOrg::Template::Service->new({
PRE_PROCESS => 'header',
POST_PROCESS => 'footer',
COOL_OPTION => 'enabled in spades',
});
my $template = Template->new({
SERVICE => $service,
});</pre>
<p>
The <a href="../../modules/Template.html">Template</a> module uses the
<a href="../../modules/Template/Config.html">Template::Config</a> <a
href="../../modules/Template/Config.html#method_service">service()</a>
factory method to create a default service object when required. The
<code>$Template::Config::SERVICE</code> package variable may be set to
specify an alternate service module. This will be loaded automatically
and its <a href="#method_new">new()</a> constructor method called by the
<a href="../../modules/Template/Config.html#method_service">service()</a> factory method when a default service
object is required. Thus the previous example could be written as:
</p>
<pre>use Template;
$Template::Config::SERVICE = 'MyOrg::Template::Service';
my $template = Template->new({
PRE_PROCESS => 'header',
POST_PROCESS => 'footer',
COOL_OPTION => 'enabled in spades',
});</pre>
</div>
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<h1 id="METHODS" onclick="switch_section(this)" title="Click title to show/hide section content.">METHODS</h1>
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<div class="subsection">
<div class="head">
<h2 id="method_new" class="method" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">new(\%config)</h2>
<a href="#body" class="top" title="Back up to the top of the page" >Top</a>
</div>
<div class="body">
<p>
The <code>new()</code> constructor method is called to instantiate a
<code>Template::Service</code> object. Configuration parameters may be
specified as a HASH reference or as a list of <code>name =>
value</code> pairs.
</p>
<pre>my $service1 = Template::Service->new({
PRE_PROCESS => 'header',
POST_PROCESS => 'footer',
});
my $service2 = Template::Service->new( ERROR => 'error.html' );</pre>
<p>
The <code>new()</code> method returns a <code>Template::Service</code>
object or <code>undef</code> on error. In the latter case, a relevant
error message can be retrieved by the <a href="../../modules/Template/Base.html#method_error">error()</a> class method or
directly from the <code>$Template::Service::ERROR</code> package
variable.
</p>
<pre>my $service = Template::Service->new(\%config)
|| die Template::Service->error();
my $service = Template::Service->new(\%config)
|| die $Template::Service::ERROR;</pre>
</div>
</div> <div class="subsection">
<div class="head">
<h2 id="method_process" class="method" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">process($input, \%replace)</h2>
<a href="#body" class="top" title="Back up to the top of the page" >Top</a>
</div>
<div class="body">
<p>
The <code>process()</code> method is called to process a template
specified as the first parameter, <code>$input</code>. This may be a file
name, file handle (e.g. <code>GLOB</code> or <code>IO::Handle</code>) or
a reference to a text string containing the template text. An additional
hash reference may be passed containing template variable definitions.
</p>
<p>
The method processes the template, adding any <a
href="#section_PRE_PROCESS_POST_PROCESS">PRE_PROCESS</a> or <a
href="#section_PRE_PROCESS_POST_PROCESS">POST_PROCESS</a> templates
defined, and returns the output text. An uncaught exception thrown by the
template will be handled by a relevant <a href="#section_ERROR">ERROR</a>
handler if defined. Errors that occur in the <a
href="#section_PRE_PROCESS_POST_PROCESS">PRE_PROCESS</a> or <a
href="#section_PRE_PROCESS_POST_PROCESS">POST_PROCESS</a> templates, or
those that occur in the main input template and aren't handled, cause the
method to return <code>undef</code> to indicate failure. The appropriate
error message can be retrieved via the <a href="../../modules/Template/Base.html#method_error">error()</a> method.
</p>
<pre>$service->process('myfile.html', { title => 'My Test File' })
|| die $service->error();</pre>
</div>
</div> <div class="subsection">
<div class="head">
<h2 id="method_context" class="method" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">context()</h2>
<a href="#body" class="top" title="Back up to the top of the page" >Top</a>
</div>
<div class="body">
<p>
Returns a reference to the internal context object which is, by default,
an instance of the <a href="../../modules/Template/Context.html">Template::Context</a> class.
</p>
</div>
</div>
</div>
</div>
<div class="section">
<div class="head">
<h1 id="CONFIGURATION_OPTIONS" onclick="switch_section(this)" title="Click title to show/hide section content.">CONFIGURATION OPTIONS</h1>
<a href="#body" class="top" title="Back up to the top of the page" >Top</a>
</div>
<div class="body">
<p>
The following list summarises the configuration options that can be
provided to the <code>Template::Service</code> <a
href="#method_new">new()</a> constructor. Please consult <a href="../../manual/Config.html">Template::Manual::Config</a>
for further details and examples of each configuration option in use.
</p>
<div class="subsection">
<div class="head">
<h2 id="section_PRE_PROCESS_POST_PROCESS" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">PRE_PROCESS, POST_PROCESS</h2>
<a href="#body" class="top" title="Back up to the top of the page" >Top</a>
</div>
<div class="body">
<p>
The <a href="../../manual/Config.html#section_PRE_PROCESS_POST_PROCESS">PRE_PROCESS</a> and <a href="../../manual/Config.html#section_PRE_PROCESS_POST_PROCESS">POST_PROCESS</a> options may be set
to contain the name(s) of template files which should be processed
immediately before and/or after each template. These do not get added to
templates processed into a document via directives such as
<code>INCLUDE</code> <code>PROCESS</code>, <code>WRAPPER</code>, etc.
</p>
<pre>my $service = Template::Service->new({
PRE_PROCESS => 'header',
POST_PROCESS => 'footer',
};</pre>
<p>
Multiple templates may be specified as a reference to a list. Each is
processed in the order defined.
</p>
<pre>my $service = Template::Service->new({
PRE_PROCESS => [ 'config', 'header' ],
POST_PROCESS => 'footer',
};</pre>
</div>
</div> <div class="subsection">
<div class="head">
<h2 id="section_PROCESS" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">PROCESS</h2>
<a href="#body" class="top" title="Back up to the top of the page" >Top</a>
</div>
<div class="body">
<p>
The <a href="../../manual/Config.html#section_PROCESS">PROCESS</a> option may be set to contain the name(s)
of template files which should be processed instead of the main template
passed to the <code>Template::Service</code> <a
href="#method_process">process()</a> method. This can be used to apply
consistent wrappers around all templates, similar to the use of <a
href="#section_PRE_PROCESS_POST_PROCESS">PRE_PROCESS</a> and <a
href="#section_PRE_PROCESS_POST_PROCESS">POST_PROCESS</a> templates.
</p>
<pre>my $service = Template::Service->new({
PROCESS => 'content',
};
# processes 'content' instead of 'foo.html'
$service->process('foo.html');</pre>
<p>
A reference to the original template is available in the
<code>template</code> variable. Metadata items can be inspected and the
template can be processed by specifying it as a variable reference (i.e.
prefixed by '<code>$</code>') to an <code>INCLUDE</code>,
<code>PROCESS</code> or <code>WRAPPER</code> directive.
</p>
<p>
Example <code>PROCESS</code> template:
</p>
<pre><html>
<head>
<title><span class="tt">[% template.title %]</span></title>
</head>
<body>
<span class="tt">[% PROCESS $template %]</span>
</body>
</html></pre>
</div>
</div> <div class="subsection">
<div class="head">
<h2 id="section_ERROR" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">ERROR</h2>
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</div>
<div class="body">
<p>
The <a href="../../manual/Config.html#section_ERROR">ERROR</a> (or <code>ERRORS</code> if you prefer)
configuration item can be used to name a single template or specify a
hash array mapping exception types to templates which should be used for
error handling. If an uncaught exception is raised from within a template
then the appropriate error template will instead be processed.
</p>
<p>
If specified as a single value then that template will be processed for
all uncaught exceptions.
</p>
<pre>my $service = Template::Service->new({
ERROR => 'error.html'
});</pre>
<p>
If the <a href="../../manual/Config.html#section_ERROR">ERROR/ERRORS</a> item is a hash reference the keys are
assumed to be exception types and the relevant template for a given
exception will be selected. A <code>default</code> template may be
provided for the general case.
</p>
<pre>my $service = Template::Service->new({
ERRORS => {
user => 'user/index.html',
dbi => 'error/database',
default => 'error/default',
},
});</pre>
</div>
</div> <div class="subsection">
<div class="head">
<h2 id="section_AUTO_RESET" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">AUTO_RESET</h2>
<a href="#body" class="top" title="Back up to the top of the page" >Top</a>
</div>
<div class="body">
<p>
The <a href="../../manual/Config.html#section_AUTO_RESET">AUTO_RESET</a> option is set by default and
causes the local <code>BLOCKS</code> cache for the <a href="../../modules/Template/Context.html">Template::Context</a> object to be
reset on each call to the <a href="../../modules/Template.html">Template</a> <a href="../../modules/Template.html#method_process">process()</a> method. This ensures that any
<code>BLOCK</code>s defined within a template will only persist until
that template is finished processing.
</p>
</div>
</div> <div class="subsection">
<div class="head">
<h2 id="section_DEBUG" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">DEBUG</h2>
<a href="#body" class="top" title="Back up to the top of the page" >Top</a>
</div>
<div class="body">
<p>
The <a href="../../manual/Config.html#section_DEBUG">DEBUG</a> option can be used to enable debugging
messages from the <code>Template::Service</code> module by setting it to
include the <code>DEBUG_SERVICE</code> value.
</p>
<pre>use Template::Constants qw( :debug );
my $template = Template->new({
DEBUG => DEBUG_SERVICE,
});</pre>
</div>
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<h1 id="AUTHOR" onclick="switch_section(this)" title="Click title to show/hide section content.">AUTHOR</h1>
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</div>
<div class="body">
<p>
Andy Wardley <[email protected]> <a
href="http://wardley.org/">http://wardley.org/</a>
</p>
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<h1 id="COPYRIGHT" onclick="switch_section(this)" title="Click title to show/hide section content.">COPYRIGHT</h1>
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</div>
<div class="body">
<p>
Copyright (C) 1996-2007 Andy Wardley. All Rights Reserved.
</p>
<p>
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
</p>
</div>
</div>
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<h1 id="SEE_ALSO" onclick="switch_section(this)" title="Click title to show/hide section content.">SEE ALSO</h1>
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</div>
<div class="body">
<p>
<a href="../../modules/Template.html">Template</a>, <a href="../../modules/Template/Context.html">Template::Context</a>
</p>
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