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<?php |
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/** |
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* Template Loader for Plugins. |
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* |
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* @package Gamajo_Template_Loader |
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* @author Gary Jones |
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* @link http://github.com/GaryJones/Gamajo-Template-Loader |
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* @copyright 2013 Gary Jones |
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* @license GPL-2.0+ |
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* @version 1.3.0 |
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*/ |
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namespace GV; |
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if ( ! class_exists( '\GV\Gamajo_Template_Loader' ) ) { |
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/** |
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* Template loader. |
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* |
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* Originally based on functions in Easy Digital Downloads (thanks Pippin!). |
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* |
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* When using in a plugin, create a new class that extends this one and just overrides the properties. |
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* |
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* @package Gamajo_Template_Loader |
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* @author Gary Jones |
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*/ |
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class Gamajo_Template_Loader { |
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/** |
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* Prefix for filter names. |
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* |
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* @since 1.0.0 |
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* |
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* @var string |
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*/ |
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protected $filter_prefix = 'your_plugin'; |
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/** |
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* Directory name where custom templates for this plugin should be found in the theme. |
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* |
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* For example: 'your-plugin-templates'. |
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* |
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* @since 1.0.0 |
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* |
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* @var string |
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*/ |
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protected $theme_template_directory = 'plugin-templates'; |
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/** |
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* Reference to the root directory path of this plugin. |
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* |
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* Can either be a defined constant, or a relative reference from where the subclass lives. |
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* |
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* e.g. YOUR_PLUGIN_TEMPLATE or plugin_dir_path( dirname( __FILE__ ) ); etc. |
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* |
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* @since 1.0.0 |
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* |
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* @var string |
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*/ |
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protected $plugin_directory = 'YOUR_PLUGIN_DIR'; |
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/** |
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* Directory name where templates are found in this plugin. |
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* |
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* Can either be a defined constant, or a relative reference from where the subclass lives. |
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* |
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* e.g. 'templates' or 'includes/templates', etc. |
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* |
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* @since 1.1.0 |
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* |
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* @var string |
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*/ |
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protected $plugin_template_directory = 'templates'; |
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/** |
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* Internal use only: Store located template paths. |
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* |
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* @var array |
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*/ |
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private $template_path_cache = array(); |
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/** |
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* Internal use only: Store variable names used for template data. |
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* |
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* Means unset_template_data() can remove all custom references from $wp_query. |
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* |
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* Initialized to contain the default 'data'. |
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* |
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* @var array |
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*/ |
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private $template_data_var_names = array('data'); |
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/** |
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* Clean up template data. |
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* |
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* @since 1.2.0 |
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*/ |
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public function __destruct() { |
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$this->unset_template_data(); |
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} |
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/** |
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* Retrieve a template part. |
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* |
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* @since 1.0.0 |
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* |
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* @param string $slug Template slug. |
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* @param string $name Optional. Template variation name. Default null. |
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* @param bool $load Optional. Whether to load template. Default true. |
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* |
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* @return string |
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*/ |
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public function get_template_part( $slug, $name = null, $load = true ) { |
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// Execute code for this part. |
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do_action( 'get_template_part_' . $slug, $slug, $name ); |
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do_action( $this->filter_prefix . '_get_template_part_' . $slug, $slug, $name ); |
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// Get files names of templates, for given slug and name. |
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$templates = $this->get_template_file_names( $slug, $name ); |
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// Return the part that is found. |
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return $this->locate_template( $templates, $load, false ); |
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} |
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/** |
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* Make custom data available to template. |
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* |
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* Data is available to the template as properties under the `$data` variable. |
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* i.e. A value provided here under `$data['foo']` is available as `$data->foo`. |
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* |
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* When an input key has a hyphen, you can use `$data->{foo-bar}` in the template. |
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* |
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* @since 1.2.0 |
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* |
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* @param mixed $data Custom data for the template. |
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* @param string $var_name Optional. Variable under which the custom data is available in the template. |
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* Default is 'data'. |
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* |
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* @return Gamajo_Template_Loader |
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*/ |
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public function set_template_data( $data, $var_name = 'data' ) { |
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global $wp_query; |
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$wp_query->query_vars[ $var_name ] = (object) $data; |
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// Add $var_name to custom variable store if not default value |
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if( $var_name !== 'data' ) { |
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$this->template_data_var_names[] = $var_name; |
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} |
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return $this; |
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} |
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/** |
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* Remove access to custom data in template. |
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* |
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* Good to use once the final template part has been requested. |
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* |
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* @since 1.2.0 |
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* |
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* @return Gamajo_Template_Loader |
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*/ |
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public function unset_template_data() { |
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global $wp_query; |
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// Remove any duplicates from the custom variable store |
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$custom_var_names = array_unique( $this->template_data_var_names ); |
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// Remove each custom data reference from $wp_query |
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foreach ( $custom_var_names as $var ) { |
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if ( isset( $wp_query->query_vars[$var] ) ) { |
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unset( $wp_query->query_vars[$var] ); |
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} |
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} |
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return $this; |
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} |
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/** |
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* Given a slug and optional name, create the file names of templates. |
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* |
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* @since 1.0.0 |
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* |
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* @param string $slug Template slug. |
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* @param string $name Template variation name. |
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* |
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* @return array |
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*/ |
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protected function get_template_file_names( $slug, $name ) { |
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$templates = array(); |
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if ( isset( $name ) ) { |
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$templates[] = $slug . '-' . $name . '.php'; |
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} |
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$templates[] = $slug . '.php'; |
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/** |
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* Allow template choices to be filtered. |
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* |
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* The resulting array should be in the order of most specific first, to least specific last. |
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* e.g. 0 => recipe-instructions.php, 1 => recipe.php |
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* |
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* @since 1.0.0 |
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* |
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* @param array $templates Names of template files that should be looked for, for given slug and name. |
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* @param string $slug Template slug. |
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* @param string $name Template variation name. |
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*/ |
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return apply_filters( $this->filter_prefix . '_get_template_part', $templates, $slug, $name ); |
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} |
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/** |
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* Retrieve the name of the highest priority template file that exists. |
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* |
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* Searches in the STYLESHEETPATH before TEMPLATEPATH so that themes which |
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* inherit from a parent theme can just overload one file. If the template is |
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* not found in either of those, it looks in the theme-compat folder last. |
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* |
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* @since 1.0.0 |
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* |
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* @param string|array $template_names Template file(s) to search for, in order. |
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* @param bool $load If true the template file will be loaded if it is found. |
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* @param bool $require_once Whether to require_once or require. Default true. |
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* Has no effect if $load is false. |
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* |
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* @return string The template filename if one is located. |
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*/ |
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public function locate_template( $template_names, $load = false, $require_once = true ) { |
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// Use $template_names as a cache key - either first element of array or the variable itself if it's a string |
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$cache_key = is_array( $template_names ) ? $template_names[0] : $template_names; |
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// If the key is in the cache array, we've already located this file. |
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if ( isset( $this->template_path_cache[$cache_key] ) ) { |
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$located = $this->template_path_cache[$cache_key]; |
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} else { |
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// No file found yet. |
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$located = false; |
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// Remove empty entries. |
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$template_names = array_filter( (array) $template_names ); |
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$template_paths = $this->get_template_paths(); |
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// Try to find a template file. |
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foreach ( $template_names as $template_name ) { |
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// Trim off any slashes from the template name. |
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$template_name = ltrim( $template_name, '/' ); |
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// Try locating this template file by looping through the template paths. |
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foreach ( $template_paths as $template_path ) { |
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if ( file_exists( $template_path . $template_name ) ) { |
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$located = $template_path . $template_name; |
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// Store the template path in the cache |
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$this->template_path_cache[$cache_key] = $located; |
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break 2; |
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} |
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} |
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} |
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} |
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if ( $load && $located ) { |
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load_template( $located, $require_once ); |
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} |
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return $located; |
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} |
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/** |
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* Return a list of paths to check for template locations. |
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* |
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* Default is to check in a child theme (if relevant) before a parent theme, so that themes which inherit from a |
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* parent theme can just overload one file. If the template is not found in either of those, it looks in the |
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* theme-compat folder last. |
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* |
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* @since 1.0.0 |
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* |
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* @return mixed|void |
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*/ |
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protected function get_template_paths() { |
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$theme_directory = trailingslashit( $this->theme_template_directory ); |
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$file_paths = array( |
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10 => trailingslashit( get_template_directory() ) . $theme_directory, |
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100 => $this->get_templates_dir(), |
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); |
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// Only add this conditionally, so non-child themes don't redundantly check active theme twice. |
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if ( get_stylesheet_directory() !== get_template_directory() ) { |
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$file_paths[1] = trailingslashit( get_stylesheet_directory() ) . $theme_directory; |
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} |
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/** |
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* Allow ordered list of template paths to be amended. |
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* |
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* @since 1.0.0 |
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* |
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* @param array $var Default is directory in child theme at index 1, parent theme at 10, and plugin at 100. |
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*/ |
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$file_paths = apply_filters( $this->filter_prefix . '_template_paths', $file_paths ); |
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// Sort the file paths based on priority. |
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ksort( $file_paths, SORT_NUMERIC ); |
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return array_map( 'trailingslashit', $file_paths ); |
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} |
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/** |
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* Return the path to the templates directory in this plugin. |
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* |
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* May be overridden in subclass. |
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* |
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311
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* @since 1.0.0 |
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* |
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* @return string |
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314
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*/ |
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protected function get_templates_dir() { |
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return trailingslashit( $this->plugin_directory ) . $this->plugin_template_directory; |
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} |
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} |
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|
|
|
} |