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03:34:38 PM

SeanMorris\Theme

Simple, sane templating and theming for PHP

github packagist

The aim of the Theme library is to provide a stark separation of presentation from logic. It has only two responsibilities:

  • Mapping objects to Views
  • Rendering those Views

Composer

Just run composer require seanmorris/theme in your project directory.

You can also add "seanmorris/theme": "^1.0.0" to the require array in your project's composer.json.

"require": {
  "seanmorris/theme": "^1.0.0"
}

Templating

Coupling the template with the View class is very simple. Simply subclass the provided View and append the template after a call to __halt_compiler(); (WITH THE CLOSING ?>) like so:

(note: Short tags are enabled for simple echo statements as of PHP 5.4, but are not required)

<?php
class FooView extends \SeanMorris\Theme\View
{
}
__halt_compiler(); ?>
<h1>FooView</h1>
<span class = "some_class"><?=$a;?></span>
<p><?=$b;?>. <b><?=$c;?></b></p>

Pass an associative array into the constructor to populate the variables in the template. The keys of the array will be translated to variable names.

<?php
$view = new FooView([
  'a' => 'value'
  , 'b' => 'value'
  , 'c' => 'value'
]);

echo $view;

Preprocessing

Preprocessing templates is simple. Just implement the preprocess method in your view class, and you'll get a chance to operate on the variables prior to rendering.

<?php
class FooView extends \SeanMorris\Theme\View
{
  public function preprocess(&$vars)
  {
    $vars['a'] = $vars['a'] . '...';
    $vars['b'] = $vars['b'] . '?';
    $vars['c'] = $vars['b'] . '!'
  }
}
__halt_compiler(); ?>
<h1>FooView</h1>
<span class = "some_class"><?=$a;?></span>
<p><?=$b;?>. <b><?=$c;?></b></p>

Usage:

<?php
$view = new FooView([
  'a' => 'value'
  , 'b' => 'value'
  , 'c' => 'value'
]);

echo $view;

Theming

Creating a theme is as simple as extending the theme class and providing a mapping from your object classes to their view classes, as shown:

<?php
class Theme extends \SeanMorris\Theme\Theme
{
  protected static
  $view = [
    'SeanMorris\Foo' => 'SeanMorris\Theme\FooView'
  ];
}

Usage:

<?php echo Theme::render(new Foo(...)); ?>

Wrapping

If you've got a default "trim" you'd like to use to wrap everything (i.e. the view that contains your <html> <head>, and <body> structure), simply set the static property $wrap to an array listing your wrappers, innermost to outtermost.

<?php
class Theme extends \SeanMorris\Theme\Theme
{
  protected static
  $wrap = [
    'SeanMorris\Theme\Wrapper'
    , 'SeanMorris\Theme\HtmlDocument' 
  ];
}

Usage:

<?php
$bodyText = 'Lorem ipsum dolor sit amet...';
echo Theme::wrap($bodyText);

Advanced Stuff...

Although the library doesn't do much, its got some power under the hood.

Fallback Themes

If a theme cannot render an object, it can defer the rendering to other themes that can. This is done by specifying the $themes static property. The list will be check in order, until a theme is able to render a given object.

<?php
class Theme extends \SeanMorris\Theme\Theme
{
  protected static
  $themes = [
    'SeanMorris\SomeTheme\Theme'
    , 'SeanMorris\SomeOtherTheme\Theme'
  ];
}

Subclassing Views

You can subclass any view class and keep the template by ommitting the call to __halt_compiler(), and extending the existing view. You'll probably want to override the parent preprocessor as well.

<?php
class FoozleView extends FooView
{
  public function preprocess(&$vars)
  {
    parent::preprocess($vars);
    $vars['a'] = $vars['object']->a . 'DIFFERENT!!!';
  }
}

Contextualized Themeing

By defining mappings from classes to views in the $contextViews array, you can specify that a view should be rendered differently when the render call is made from certain classes.

In this example SeanMorris\Stuff\Foo will be rendered with the SeanMorris\Theme\FooAlternateView class when rendered inside of the SeanMorris\Stuff\RandomObject class, but outside, it will be rendered with SeanMorris\Theme\FooView.

<?php
class Theme extends \SeanMorris\Theme\Theme
{
  protected static
  $contextView = [
    'SeanMorris\Stuff\RandomObject' => [
      'SeanMorris\Stuff\Foo' => 'SeanMorris\Theme\FooAlternateView'
    ]
  ]
  , $view = [
    'SeanMorris\Stuff\Foo' => 'SeanMorris\Theme\FooView'
  ];
}
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