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name : Minify_Page.php
 <?php
namespace W3TC;



class Minify_Page extends Base_Page_Settings {
	/**
	 * Current page
	 *
	 * @var string
	 */
	protected $_page = 'w3tc_minify';

	/**
	 * Minify tab
	 *
	 * @return void
	 */
	function view() {
		$minify_enabled = $this->_config->get_boolean( 'minify.enabled' );
		$config_state = Dispatcher::config_state();

		$minify_rewrite_disabled = !Util_Rule::can_check_rules() ||
			$this->_config->is_sealed( 'minify.rewrite' );
		$themes = Util_Theme::get_themes_by_key();
		$templates = array();

		$current_theme = Util_Theme::get_current_theme_name();
		$current_theme_key = '';

		foreach ( $themes as $theme_key => $theme_name ) {
			if ( $theme_name == $current_theme ) {
				$current_theme_key = $theme_key;
			}

			$templates[$theme_key] = Util_Theme::get_theme_templates( $theme_name );
		}

		$css_imports_values = array(
			'' => 'None',
			'bubble' => 'Bubble',
			'process' => 'Process',
		);

		$auto = $this->_config->get_boolean( 'minify.auto' );



		$js_theme = Util_Request::get_string( 'js_theme', $current_theme_key );
		$js_groups = $this->_config->get_array( 'minify.js.groups' );

		$css_theme = Util_Request::get_string( 'css_theme', $current_theme_key );
		$css_groups = $this->_config->get_array( 'minify.css.groups' );

		$js_engine = $this->_config->get_string( 'minify.js.engine' );
		$css_engine = $this->_config->get_string( 'minify.css.engine' );
		$html_engine = $this->_config->get_string( 'minify.html.engine' );

		$css_imports = $this->_config->get_string( 'minify.css.imports' );

		// Required for Update Media Query String button
		$browsercache_enabled = $this->_config->get_boolean( 'browsercache.enabled' );
		$browsercache_update_media_qs = ( $this->_config->get_boolean( 'browsercache.cssjs.replace' ) );

		include W3TC_INC_DIR . '/options/minify.php';
	}

	function recommendations() {
		$themes = Util_Theme::get_themes_by_key();

		$current_theme = Util_Theme::get_current_theme_name();
		$current_theme_key = array_search( $current_theme, $themes );



		$theme_key = Util_Request::get_string( 'theme_key', $current_theme_key );
		$theme_name = ( isset( $themes[$theme_key] ) ? $themes[$theme_key] : $current_theme );

		$templates = Util_Theme::get_theme_templates( $theme_name );
		$recommendations = $this->get_theme_recommendations( $theme_name );

		list ( $js_groups, $css_groups ) = $recommendations;

		$minify_js_groups = $this->_config->get_array( 'minify.js.groups' );
		$minify_css_groups = $this->_config->get_array( 'minify.css.groups' );

		$checked_js = array();
		$checked_css = array();

		$locations_js = array();

		if ( isset( $minify_js_groups[$theme_key] ) ) {
			foreach ( (array) $minify_js_groups[$theme_key] as $template => $locations ) {
				foreach ( (array) $locations as $location => $config ) {
					if ( isset( $config['files'] ) ) {
						foreach ( (array) $config['files'] as $file ) {
							if ( !isset( $js_groups[$template] ) || !in_array( $file, $js_groups[$template] ) ) {
								$js_groups[$template][] = $file;
							}

							$checked_js[$template][$file] = true;
							$locations_js[$template][$file] = $location;
						}
					}
				}
			}
		}

		if ( isset( $minify_css_groups[$theme_key] ) ) {
			foreach ( (array) $minify_css_groups[$theme_key] as $template => $locations ) {
				foreach ( (array) $locations as $location => $config ) {
					if ( isset( $config['files'] ) ) {
						foreach ( (array) $config['files'] as $file ) {
							if ( !isset( $css_groups[$template] ) || !in_array( $file, $css_groups[$template] ) ) {
								$css_groups[$template][] = $file;
							}

							$checked_css[$template][$file] = true;
						}
					}
				}
			}
		}

		include W3TC_INC_DIR . '/lightbox/minify_recommendations.php';
	}

	/**
	 * Returns array of detected URLs for theme templates
	 *
	 * @param string  $theme_name
	 * @return array
	 */
	function get_theme_urls( $theme_name ) {
		$urls = array();
		$theme = Util_Theme::get( $theme_name );

		if ( $theme && isset( $theme['Template Files'] ) ) {
			$front_page_template = false;

			if ( get_option( 'show_on_front' ) == 'page' ) {
				$front_page_id = get_option( 'page_on_front' );

				if ( $front_page_id ) {
					$front_page_template_file = get_post_meta( $front_page_id, '_wp_page_template', true );

					if ( $front_page_template_file ) {
						$front_page_template = basename( $front_page_template_file, '.php' );
					}
				}
			}

			$home_url = get_home_url();
			$template_files = (array) $theme['Template Files'];

			$mime_types = get_allowed_mime_types();
			$custom_mime_types = array();

			foreach ( $mime_types as $mime_type ) {
				list ( $type1, $type2 ) = explode( '/', $mime_type );
				$custom_mime_types = array_merge( $custom_mime_types, array(
						$type1,
						$type2,
						$type1 . '_' . $type2
					) );
			}

			foreach ( $template_files as $template_file ) {
				$link = false;
				$template = basename( $template_file, '.php' );

				/**
				 * Check common templates
				 */
				switch ( true ) {
					/**
					 * Handle home.php or index.php or front-page.php
					 */
				case ( !$front_page_template && $template == 'home' ):
				case ( !$front_page_template && $template == 'index' ):
				case ( !$front_page_template && $template == 'front-page' ):

					/**
					 * Handle custom home page
					 */
				case ( $template == $front_page_template ):
					$link = $home_url . '/';
					break;

					/**
					 * Handle 404.php
					 */
				case ( $template == '404' ):
					$permalink = get_option( 'permalink_structure' );
					if ( $permalink ) {
						$link = sprintf( '%s/%s/', $home_url, '404_test' );
					} else {
						$link = sprintf( '%s/?p=%d', $home_url, 999999999 );
					}
					break;

					/**
					 * Handle search.php
					 */
				case ( $template == 'search' ):
					$link = sprintf( '%s/?s=%s', $home_url, 'search_test' );
					break;

					/**
					 * Handle date.php or archive.php
					 */
				case ( $template == 'date' ):
				case ( $template == 'archive' ):
					$posts = get_posts( array(
							'numberposts' => 1,
							'orderby' => 'rand'
						) );
					if ( is_array( $posts ) && count( $posts ) ) {
						$time = strtotime( $posts[0]->post_date );
						$link = get_day_link( date( 'Y', $time ), date( 'm', $time ), date( 'd', $time ) );
					}
					break;

					/**
					 * Handle author.php
					 */
				case ( $template == 'author' ):
					$author_id = false;
					if ( function_exists( 'get_users' ) ) {
						$users = get_users();
						if ( is_array( $users ) && count( $users ) ) {
							$user = current( $users );
							$author_id = $user->ID;
						}
					} else {
						$author_ids = get_author_user_ids();
						if ( is_array( $author_ids ) && count( $author_ids ) ) {
							$author_id = $author_ids[0];
						}
					}
					if ( $author_id ) {
						$link = get_author_posts_url( $author_id );
					}
					break;

					/**
					 * Handle category.php
					 */
				case ( $template == 'category' ):
					$category_ids = get_terms( 'category', array(
							'orderby' => 'id',
							'number' => 1,
							'fields' => 'ids' ) );

					if ( is_array( $category_ids ) && count( $category_ids ) ) {
						$link = get_category_link( $category_ids[0] );
					}
					break;

					/**
					 * Handle tag.php
					 */
				case ( $template == 'tag' ):
					$term_ids = get_terms( 'post_tag', 'fields=ids' );
					if ( is_array( $term_ids ) && count( $term_ids ) ) {
						$link = get_term_link( $term_ids[0], 'post_tag' );
					}
					break;

					/**
					 * Handle taxonomy.php
					 */
				case ( $template == 'taxonomy' ):
					$taxonomy = '';
					if ( isset( $GLOBALS['wp_taxonomies'] ) && is_array( $GLOBALS['wp_taxonomies'] ) ) {
						foreach ( $GLOBALS['wp_taxonomies'] as $wp_taxonomy ) {
							if ( !in_array( $wp_taxonomy->name, array(
										'category',
										'post_tag',
										'link_category'
									) ) ) {
								$taxonomy = $wp_taxonomy->name;
								break;
							}
						}
					}
					if ( $taxonomy ) {
						$terms = get_terms( $taxonomy, array(
								'number' => 1
							) );
						if ( is_array( $terms ) && count( $terms ) ) {
							$link = get_term_link( $terms[0], $taxonomy );
						}
					}
					break;

					/**
					 * Handle attachment.php
					 */
				case ( $template == 'attachment' ):
					$attachments = get_posts( array(
							'post_type' => 'attachment',
							'numberposts' => 1,
							'orderby' => 'rand'
						) );
					if ( is_array( $attachments ) && count( $attachments ) ) {
						$link = get_attachment_link( $attachments[0]->ID );
					}
					break;

					/**
					 * Handle single.php
					 */
				case ( $template == 'single' ):
					$posts = get_posts( array(
							'numberposts' => 1,
							'orderby' => 'rand'
						) );
					if ( is_array( $posts ) && count( $posts ) ) {
						$link = get_permalink( $posts[0]->ID );
					}
					break;

					/**
					 * Handle page.php
					 */
				case ( $template == 'page' ):
					$pages_ids = get_all_page_ids();
					if ( is_array( $pages_ids ) && count( $pages_ids ) ) {
						$link = get_page_link( $pages_ids[0] );
					}
					break;

					/**
					 * Handle comments-popup.php
					 */
				case ( $template == 'comments-popup' ):
					$posts = get_posts( array(
							'numberposts' => 1,
							'orderby' => 'rand'
						) );
					if ( is_array( $posts ) && count( $posts ) ) {
						$link = sprintf( '%s/?comments_popup=%d', $home_url, $posts[0]->ID );
					}
					break;

					/**
					 * Handle paged.php
					 */
				case ( $template == 'paged' ):
					global $wp_rewrite;
					if ( $wp_rewrite->using_permalinks() ) {
						$link = sprintf( '%s/page/%d/', $home_url, 1 );
					} else {
						$link = sprintf( '%s/?paged=%d', 1 );
					}
					break;

					/**
					 * Handle author-id.php or author-nicename.php
					 */
				case preg_match( '~^author-(.+)$~', $template, $matches ):
					if ( is_numeric( $matches[1] ) ) {
						$link = get_author_posts_url( $matches[1] );
					} else {
						$link = get_author_posts_url( null, $matches[1] );
					}
					break;

					/**
					 * Handle category-id.php or category-slug.php
					 */
				case preg_match( '~^category-(.+)$~', $template, $matches ):
					if ( is_numeric( $matches[1] ) ) {
						$link = get_category_link( $matches[1] );
					} else {
						$term = get_term_by( 'slug', $matches[1], 'category' );
						if ( is_object( $term ) ) {
							$link = get_category_link( $term->term_id );
						}
					}
					break;

					/**
					 * Handle tag-id.php or tag-slug.php
					 */
				case preg_match( '~^tag-(.+)$~', $template, $matches ):
					if ( is_numeric( $matches[1] ) ) {
						$link = get_tag_link( $matches[1] );
					} else {
						$term = get_term_by( 'slug', $matches[1], 'post_tag' );
						if ( is_object( $term ) ) {
							$link = get_tag_link( $term->term_id );
						}
					}
					break;

					/**
					 * Handle taxonomy-taxonomy-term.php
					 */
				case preg_match( '~^taxonomy-(.+)-(.+)$~', $template, $matches ):
					$link = get_term_link( $matches[2], $matches[1] );
					break;

					/**
					 * Handle taxonomy-taxonomy.php
					 */
				case preg_match( '~^taxonomy-(.+)$~', $template, $matches ):
					$terms = get_terms( $matches[1], array(
							'number' => 1
						) );
					if ( is_array( $terms ) && count( $terms ) ) {
						$link = get_term_link( $terms[0], $matches[1] );
					}
					break;

					/**
					 * Handle MIME_type.php
					 */
				case in_array( $template, $custom_mime_types ):
					$posts = get_posts( array(
							'post_mime_type' => '%' . $template . '%',
							'post_type' => 'attachment',
							'numberposts' => 1,
							'orderby' => 'rand'
						) );
					if ( is_array( $posts ) && count( $posts ) ) {
						$link = get_permalink( $posts[0]->ID );
					}
					break;

					/**
					 * Handle single-posttype.php
					 */
				case preg_match( '~^single-(.+)$~', $template, $matches ):
					$posts = get_posts( array(
							'post_type' => $matches[1],
							'numberposts' => 1,
							'orderby' => 'rand'
						) );

					if ( is_array( $posts ) && count( $posts ) ) {
						$link = get_permalink( $posts[0]->ID );
					}
					break;

					/**
					 * Handle page-id.php or page-slug.php
					 */
				case preg_match( '~^page-(.+)$~', $template, $matches ):
					if ( is_numeric( $matches[1] ) ) {
						$link = get_permalink( $matches[1] );
					} else {
						$posts = get_posts( array(
								'pagename' => $matches[1],
								'post_type' => 'page',
								'numberposts' => 1
							) );

						if ( is_array( $posts ) && count( $posts ) ) {
							$link = get_permalink( $posts[0]->ID );
						}
					}
					break;

					/**
					 * Try to handle custom template
					 */
				default:
					$posts = get_posts( array(
							'pagename' => $template,
							'post_type' => 'page',
							'numberposts' => 1
						) );

					if ( is_array( $posts ) && count( $posts ) ) {
						$link = get_permalink( $posts[0]->ID );
					}
					break;
				}

				if ( $link && !is_wp_error( $link ) ) {
					$urls[$template] = $link;
				}
			}
		}

		return $urls;
	}

	/**
	 * Returns theme recommendations
	 *
	 * @param string  $theme_name
	 * @return array
	 */
	function get_theme_recommendations( $theme_name ) {
		$urls = $this->get_theme_urls( $theme_name );

		$js_groups = array();
		$css_groups = array();

		@set_time_limit( $this->_config->get_integer( 'timelimit.minify_recommendations' ) );

		foreach ( $urls as $template => $url ) {
			/**
			 * Append theme identifier
			 */
			$url .= ( strstr( $url, '?' ) !== false ? '&' : '?' ) .
				'w3tc_theme=' . urlencode( $theme_name );

			/**
			 * If preview mode enabled append w3tc_preview
			 */
			if ( $this->_config->is_preview() ) {
				$url .= '&w3tc_preview=1';
			}

			/**
			 * Get page contents
			 */
			$response = Util_Http::get( $url );

			if ( !is_wp_error( $response ) &&
				( $response['response']['code'] == 200 ||
					( $response['response']['code'] == 404 && $template == '404' ) ) ) {
				$js_files = $this->get_recommendations_js( $response['body'] );
				$css_files = $this->get_recommendations_css( $response['body'] );

				$js_groups[$template] = $js_files;
				$css_groups[$template] = $css_files;
			}
		}

		$js_groups = $this->get_theme_recommendations_by_groups( $js_groups );
		$css_groups = $this->get_theme_recommendations_by_groups( $css_groups );

		$recommendations = array(
			$js_groups,
			$css_groups
		);

		return $recommendations;
	}

	/**
	 * Find common files and place them into default group
	 *
	 * @param array   $groups
	 * @return array
	 */
	function get_theme_recommendations_by_groups( $groups ) {
		/**
		 * First calculate file usage count
		 */
		$all_files = array();

		foreach ( $groups as $template => $files ) {
			foreach ( $files as $file ) {
				if ( !isset( $all_files[$file] ) ) {
					$all_files[$file] = 0;
				}

				$all_files[$file]++;
			}
		}

		/**
		 * Determine default group files
		 */
		$default_files = array();
		$count = count( $groups );

		foreach ( $all_files as $all_file => $all_file_count ) {
			/**
			 * If file usage count == groups count then file is common
			 */
			if ( $count == $all_file_count ) {
				$default_files[] = $all_file;

				/**
				 * If common file found unset it from all groups
				 */
				foreach ( $groups as $template => $files ) {
					foreach ( $files as $index => $file ) {
						if ( $file == $all_file ) {
							array_splice( $groups[$template], $index, 1 );
							if ( !count( $groups[$template] ) ) {
								unset( $groups[$template] );
							}
							break;
						}
					}
				}
			}
		}

		/**
		 * If there are common files append add them into default group
		 */
		if ( count( $default_files ) ) {
			$new_groups = array();
			$new_groups['default'] = $default_files;

			foreach ( $groups as $template => $files ) {
				$new_groups[$template] = $files;
			}

			$groups = $new_groups;
		}

		/**
		 * Unset empty templates
		 */
		foreach ( $groups as $template => $files ) {
			if ( !count( $files ) ) {
				unset( $groups[$template] );
			}
		}

		return $groups;
	}

	/**
	 * Parse content and return JS recommendations
	 *
	 * @param string  $content
	 * @return array
	 */
	function get_recommendations_js( $content ) {


		$files = Minify_Extract::extract_js( $content );

		$files = array_map( array( '\W3TC\Util_Environment', 'normalize_file_minify' ), $files );
		$files = array_unique( $files );
		$ignore_files = $this->_config->get_array( 'minify.reject.files.js' );
		$files = array_diff( $files, $ignore_files );
		return $files;
	}

	/**
	 * Parse content and return CSS recommendations
	 *
	 * @param string  $content
	 * @return array
	 */
	function get_recommendations_css( $content ) {
		$tag_files = Minify_Extract::extract_css( $content );
		$files = array();
		foreach ( $tag_files as $tag_file )
			$files[] = $tag_file[1];

		$files = array_map( array( '\W3TC\Util_Environment', 'normalize_file_minify' ), $files );
		$files = array_unique( $files );
		$ignore_files = $this->_config->get_array( 'minify.reject.files.css' );
		$files = array_diff( $files, $ignore_files );

		return $files;
	}
}
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