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<h1 class="headline">Template::Stash</h1>
<h2 class="subhead">Magical storage for template variables</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="#PUBLIC_METHODS">PUBLIC METHODS</a></li>
<li class="sub"><a href="#method_new">new(\%params)</a></li>
<li class="sub"><a href="#method_get">get($variable)</a></li>
<li class="sub"><a href="#method_set">set($variable, $value, $default)</a></li>
<li class="sub"><a href="#method_clone">clone(\%params)</a></li>
<li class="sub"><a href="#method_declone">declone()</a></li>
<li class=""><a href="#AUTHOR">AUTHOR</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::Stash;
my $stash = Template::Stash->new(\%vars);
# get variable values
$value = $stash->get($variable);
$value = $stash->get(\@compound);
# set variable value
$stash->set($variable, $value);
$stash->set(\@compound, $value);
# default variable value
$stash->set($variable, $value, 1);
$stash->set(\@compound, $value, 1);
# set variable values en masse
$stash->update(\%new_vars)
# methods for (de-)localising variables
$stash = $stash->clone(\%new_vars);
$stash = $stash->declone();</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::Stash</code> module defines an object class which is
used to store variable values for the runtime use of the template
processor. Variable values are stored internally in a hash reference
(which itself is blessed to create the object) and are accessible via the
<a href="#method_get">get()</a> and <a href="#method_set">set()</a>
methods.
</p>
<p>
Variables may reference hash arrays, lists, subroutines and objects as
well as simple values. The stash automatically performs the right magic
when dealing with variables, calling code or object methods, indexing
into lists, hashes, etc.
</p>
<p>
The stash has <a href="#method_clone">clone()</a> and <a
href="#method_declone">declone()</a> methods which are used by the
template processor to make temporary copies of the stash for localising
changes made to variables.
</p>
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<h1 id="PUBLIC_METHODS" onclick="switch_section(this)" title="Click title to show/hide section content.">PUBLIC METHODS</h1>
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<h2 id="method_new" class="method" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">new(\%params)</h2>
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<p>
The <code>new()</code> constructor method creates and returns a reference
to a new <code>Template::Stash</code> object.
</p>
<pre>my $stash = Template::Stash->new();</pre>
<p>
A hash reference may be passed to provide variables and values which
should be used to initialise the stash.
</p>
<pre>my $stash = Template::Stash->new({ var1 => 'value1',
var2 => 'value2' });</pre>
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<h2 id="method_get" class="method" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">get($variable)</h2>
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<p>
The <code>get()</code> method retrieves the variable named by the first
parameter.
</p>
<pre>$value = $stash->get('var1');</pre>
<p>
Dotted compound variables can be retrieved by specifying the variable
elements by reference to a list. Each node in the variable occupies two
entries in the list. The first gives the name of the variable element,
the second is a reference to a list of arguments for that element, or
<code>0</code> if none.
</p>
<pre>[% foo.bar(10).baz(20) %]
$stash->get([ 'foo', 0, 'bar', [ 10 ], 'baz', [ 20 ] ]);</pre>
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<h2 id="method_set" class="method" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">set($variable, $value, $default)</h2>
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<p>
The <code>set()</code> method sets the variable name in the first
parameter to the value specified in the second.
</p>
<pre>$stash->set('var1', 'value1');</pre>
<p>
If the third parameter evaluates to a true value, the variable is set
only if it did not have a true value before.
</p>
<pre>$stash->set('var2', 'default_value', 1);</pre>
<p>
Dotted compound variables may be specified as per <a
href="#method_get">get()</a> above.
</p>
<pre>[% foo.bar = 30 %]
$stash->set([ 'foo', 0, 'bar', 0 ], 30);</pre>
<p>
The magical variable '<code>IMPORT</code>' can be specified whose
corresponding value should be a hash reference. The contents of the hash
array are copied (i.e. imported) into the current namespace.
</p>
<pre># foo.bar = baz, foo.wiz = waz
$stash->set('foo', { 'bar' => 'baz', 'wiz' => 'waz' });
# import 'foo' into main namespace: bar = baz, wiz = waz
$stash->set('IMPORT', $stash->get('foo'));</pre>
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<h2 id="method_clone" class="method" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">clone(\%params)</h2>
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<p>
The <code>clone()</code> method creates and returns a new
<code>Template::Stash</code> object which represents a localised copy of
the parent stash. Variables can be freely updated in the cloned stash and
when <a href="#method_declone">declone()</a> is called, the original
stash is returned with all its members intact and in the same state as
they were before <code>clone()</code> was called.
</p>
<p>
For convenience, a hash of parameters may be passed into
<code>clone()</code> which is used to update any simple variable (i.e.
those that don't contain any namespace elements like <code>foo</code> and
<code>bar</code> but not <code>foo.bar</code>) variables while cloning
the stash. For adding and updating complex variables, the <a
href="#method_set">set()</a> method should be used after calling
<code>clone().</code> This will correctly resolve and/or create any
necessary namespace hashes.
</p>
<p>
A cloned stash maintains a reference to the stash that it was copied from
in its <code>_PARENT</code> member.
</p>
</div>
</div> <div class="subsection">
<div class="head">
<h2 id="method_declone" class="method" onclick="switch_subsection(this)" title="Click title to show/hide sub-section content.">declone()</h2>
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<p>
The <code>declone()</code> method returns the <code>_PARENT</code>
reference and can be used to restore the state of a stash as described
above.
</p>
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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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<p>
Andy Wardley <abw@wardley.org> <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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<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>
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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>
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<p>
<a href="../../modules/Template.html">Template</a>, <a href="../../modules/Template/Context.html">Template::Context</a>
</p>
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/modules/Template/Stash.html last modified 10:55:10 31-May-2007
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