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<?php |
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/** |
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* Context.php - Template context |
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* |
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* A context for a template being rendered. |
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* |
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* The "$this" var in a template will refer to an instance of this |
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* class, which will then provide the template variables, and the |
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* include() method, to render a template inside of another. |
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* |
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* @package jaxon-utils |
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* @author Thierry Feuzeu <[email protected]> |
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* @copyright 2022 Thierry Feuzeu <[email protected]> |
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* @license https://opensource.org/licenses/BSD-3-Clause BSD 3-Clause License |
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* @link https://github.com/jaxon-php/jaxon-core |
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*/ |
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namespace Jaxon\Utils\Template; |
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use Closure; |
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use function call_user_func; |
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use function is_readable; |
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use function ob_get_clean; |
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use function ob_start; |
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use function strrpos; |
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use function substr; |
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use function trim; |
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class Context |
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{ |
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/** |
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* @var Context|null |
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*/ |
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private $__extends__ = null; |
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/** |
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* @var string |
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*/ |
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private $__block_name__; |
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/** |
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* @var array |
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*/ |
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private $__properties__ = []; |
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/** |
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* The constructor |
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* |
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* @param array $__namespaces__ |
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* @param string $__default_namespace__ |
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* @param string $__template__ |
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*/ |
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public function __construct(protected array $__namespaces__, |
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protected string $__default_namespace__, protected string $__template__) |
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{} |
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/** |
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* @param string $name |
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* |
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* @return mixed |
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*/ |
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public function __get(string $name): mixed |
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{ |
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return $this->__properties__[$name] ?? ''; |
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} |
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/** |
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* @param string $name |
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* @param mixed $value |
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* |
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* @return void |
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*/ |
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public function __set(string $name, $value): void |
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{ |
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$this->__properties__[$name] = $value; |
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} |
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/** |
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* Include a template |
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* |
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* @param string $template The name of template to be rendered |
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* @param array $vars The template vars |
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* |
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* @return void |
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*/ |
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protected function include(string $template, array $vars = []): void |
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{ |
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$context = new Context($this->__namespaces__, |
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$this->__default_namespace__, $template); |
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echo $context->__render($vars); |
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} |
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/** |
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* @param string $template The name of template to be rendered |
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* |
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* @return void |
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*/ |
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public function extends(string $template): void |
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{ |
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$this->__extends__ = new Context($this->__namespaces__, |
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$this->__default_namespace__, $template); |
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} |
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/** |
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* Start a new block |
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* |
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* @param string $name |
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* |
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* @return void |
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*/ |
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public function block(string $name): void |
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{ |
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ob_start(); |
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$this->__block_name__ = $name; |
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} |
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/** |
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* End the current block |
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* |
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* @param Closure|null $filter |
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* |
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* @return void |
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*/ |
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public function endblock(?Closure $filter = null): void |
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{ |
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$content = ob_get_clean(); |
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$this->__set($this->__block_name__, !$filter ? $content : $filter($content)); |
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} |
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/** |
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* @return string |
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*/ |
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private function __path(): string |
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{ |
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$template = trim($this->__template__); |
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// Get the namespace name |
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$namespace = $this->__default_namespace__; |
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$separatorPosition = strrpos($template, '::'); |
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if($separatorPosition !== false) |
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{ |
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$namespace = substr($template, 0, $separatorPosition); |
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$template = substr($template, $separatorPosition + 2); |
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} |
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// Check if the namespace is defined |
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if(!isset($this->__namespaces__[$namespace])) |
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{ |
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return $template; |
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} |
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$namespace = $this->__namespaces__[$namespace]; |
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// Get the template path |
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return $namespace['directory'] . $template . $namespace['extension']; |
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} |
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/** |
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* Render a template |
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* |
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* @param array $vars The template vars |
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* |
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* @return string |
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*/ |
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public function __render(array $vars): string |
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{ |
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// Get the template path |
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$templatePath = $this->__path(); |
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if(!@is_readable($templatePath)) |
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{ |
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return ''; |
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} |
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// Save the template properties. |
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foreach($vars as $name => $value) |
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{ |
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$this->__set((string)$name, $value); |
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} |
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// Render the template |
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$renderer = function() use($templatePath) { |
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ob_start(); |
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include $templatePath; |
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$content = ob_get_clean(); |
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return $this->__extends__ === null ? $content : |
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// Render the extended template with the same properties. |
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$this->__extends__->__render($this->__properties__); |
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}; |
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// Call the closure in the context of this object. |
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// So the keyword '$this' in the template will refer to this object. |
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return call_user_func($renderer->bindTo($this)); |
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} |
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} |
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jaxon-php /
jaxon-utils
