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Informations about the package templator
TCCL Template Generation Library
This project provides a simple PHP code library for generating pages from PHP template files.
Installation
This library is available as a composer package. Require tccl/templator
in your composer.json file and then install.
composer require tccl/templator
Usage
Templator loads PHP template files from the include path. First make sure your include path is configured correctly. Alternatively you can load templates relative to the script directory. Template scripts must have some arbitrary extension. If not, the functionality attempts to use the extension .php.tpl
by appending it to the end of the path.
The base interface \TCCL\Templator\Templator
defines the contract for templators. The library provides a basic templator via the \TCCL\Templator\TemplateGenerator
class and an extended version via the \TCCL\Templator\PageGenerator
class. The TemplateGenerator
is a generic
template generator and the PageGenerator
is a more specialized version for top-level HTML pages. PageGenerator
extends TemplateGenerator
.
Sample usage
$page = new \TCCL\Templator\PageGenerator('login'); // i.e. login.php.tpl
$page->addVariable('failed',true);
$html = $page->evaluate();
echo $html;
Templators of type TemplateGenerator
are designed to have nested components (which are themselves templators). These templators are executed in the context of a method call, meaning the $this
variable always refers to the templator instance.
TemplateGenerator
instances also store lists of variables which are extracted into the scope of the template script execution. Variables should be added in your model via addVariable() or addVariables(). Variables are imported from a parent templator into the scope of a child template script execution.
Pre-evaluation
TemplateGenerator
instances may be pre-evaluated by toggling a flag in the constructor call. When a template is pre-evaluated, it is executed preemptively when it is first added to a parent TemplateGenerator
, or, in the case of a PageGenerator
, when the object is first created. The variable $this->preeval
is set to true
in this case. If a pre-evaluated template script produces output, this output is kept in a memory cache for the lifetime of the templator.
Caution! This could negatively affect performance if a template script produces a lot of output. On the other hand, a template script may return no output when pre-evaluated by use of a
return
statement. This is useful for performing some configuration task specific to that template (e.g. adding a CSS-file reference).
A script may toggle $this->preeval
to false
to generate output when the script is called again. This only works if the template script returns before producing any output since evaluations are cached.
Example
Example template script using PageGenerator
methods:
<html>
<head>
<title></title>
</head>
<body>
<div class="core-content">
</div>
</body>
</html>
Sample code creating such a PageGenerator
(the templators are configured to avoid pre-evaluating HTML in memory):
$page = new \TCCL\Templator\PageGenerator('index');
$page->addVariable('title','The Site');
$topbar = new \TCCL\Templator\TemplateGenerator('top-bar');
$page->addComponent('top-bar',$topbar);
$content = new \TCCL\Templator\TemplateGenerator('index-content');
$page->addComponent('content',$content);