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Editing: class-template-loader.php

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

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