<?php

/**

 * Theme, template, and stylesheet functions.

 *

 * @package WordPress

 * @subpackage Theme

 */

/**

 * Returns an array of WP_Theme objects based on the arguments.

 *

 * Despite advances over get_themes(), this function is quite expensive, and grows

 * linearly with additional themes. Stick to wp_get_theme() if possible.

 *

 * @since 3.4.0

 *

 * @global array $wp_theme_directories

 *

 * @param array $args {

 *     Optional. The search arguments.

 *

 *     @type mixed $errors  True to return themes with errors, false to return

 *                          themes without errors, null to return all themes.

 *                          Default false.

 *     @type mixed $allowed (Multisite) True to return only allowed themes for a site.

 *                          False to return only disallowed themes for a site.

 *                          'site' to return only site-allowed themes.

 *                          'network' to return only network-allowed themes.

 *                          Null to return all themes. Default null.

 *     @type int   $blog_id (Multisite) The blog ID used to calculate which themes

 *                          are allowed. Default 0, synonymous for the current blog.

 * }

 * @return WP_Theme[] Array of WP_Theme objects.

 */

function wp_get_themes( $args = array() ) {

	global $wp_theme_directories;

	$defaults = array(

		'errors'  => false,

		'allowed' => null,

		'blog_id' => 0,

	);

	$args     = wp_parse_args( $args, $defaults );

	$theme_directories = search_theme_directories();

	if ( is_array( $wp_theme_directories ) && count( $wp_theme_directories ) > 1 ) {

		$current_theme = get_stylesheet();

		if ( isset( $theme_directories[ $current_theme ] ) ) {

			$root_of_current_theme = get_raw_theme_root( $current_theme );

			if ( ! in_array( $root_of_current_theme, $wp_theme_directories, true ) ) {

				$root_of_current_theme = WP_CONTENT_DIR . $root_of_current_theme;

			}

			$theme_directories[ $current_theme ]['theme_root'] = $root_of_current_theme;

		}

	}

	if ( empty( $theme_directories ) ) {

		return array();

	}

	if ( is_multisite() && null !== $args['allowed'] ) {

		$allowed = $args['allowed'];

		if ( 'network' === $allowed ) {

			$theme_directories = array_intersect_key( $theme_directories, WP_Theme::get_allowed_on_network() );

		} elseif ( 'site' === $allowed ) {

			$theme_directories = array_intersect_key( $theme_directories, WP_Theme::get_allowed_on_site( $args['blog_id'] ) );

		} elseif ( $allowed ) {

			$theme_directories = array_intersect_key( $theme_directories, WP_Theme::get_allowed( $args['blog_id'] ) );

		} else {

			$theme_directories = array_diff_key( $theme_directories, WP_Theme::get_allowed( $args['blog_id'] ) );

		}

	}

	$themes         = array();

	static $_themes = array();

	foreach ( $theme_directories as $theme => $theme_root ) {

		if ( isset( $_themes[ $theme_root['theme_root'] . '/' . $theme ] ) ) {

			$themes[ $theme ] = $_themes[ $theme_root['theme_root'] . '/' . $theme ];

		} else {

			$themes[ $theme ] = new WP_Theme( $theme, $theme_root['theme_root'] );

			$_themes[ $theme_root['theme_root'] . '/' . $theme ] = $themes[ $theme ];

		}

	}

	if ( null !== $args['errors'] ) {

		foreach ( $themes as $theme => $wp_theme ) {

				unset( $themes[ $theme ] );

			}

		}

	}

	return $themes;

}

/**

 * Gets a WP_Theme object for a theme.

 *

 * @since 3.4.0

 *

 * @global array $wp_theme_directories

 *

 * @param string $stylesheet Optional. Directory name for the theme. Defaults to active theme.

 * @param string $theme_root Optional. Absolute path of the theme root to look in.

 *                           If not specified, get_raw_theme_root() is used to calculate

 *                           the theme root for the $stylesheet provided (or active theme).

 * @return WP_Theme Theme object. Be sure to check the object's exists() method

 *                  if you need to confirm the theme's existence.

 */

function wp_get_theme( $stylesheet = '', $theme_root = '' ) {

	global $wp_theme_directories;

	if ( empty( $stylesheet ) ) {

		$stylesheet = get_stylesheet();

	}

	if ( empty( $theme_root ) ) {

		$theme_root = get_raw_theme_root( $stylesheet );

		if ( false === $theme_root ) {

			$theme_root = WP_CONTENT_DIR . '/themes';

		} elseif ( ! in_array( $theme_root, (array) $wp_theme_directories, true ) ) {

			$theme_root = WP_CONTENT_DIR . $theme_root;

		}

	}

	return new WP_Theme( $stylesheet, $theme_root );

}

/**

 * Clears the cache held by get_theme_roots() and WP_Theme.

 *

 * @since 3.5.0

 * @param bool $clear_update_cache Whether to clear the theme updates cache.

 */

function wp_clean_themes_cache( $clear_update_cache = true ) {

	if ( $clear_update_cache ) {

		delete_site_transient( 'update_themes' );

	}

	search_theme_directories( true );

	foreach ( wp_get_themes( array( 'errors' => null ) ) as $theme ) {

		$theme->cache_delete();

	}

}

/**

 * Whether a child theme is in use.

 *

 * @since 3.0.0

 *

 * @return bool True if a child theme is in use, false otherwise.

 */

function is_child_theme() {

}

/**

 * Retrieves name of the current stylesheet.

 *

 * The theme name that is currently set as the front end theme.

 *

 * For all intents and purposes, the template name and the stylesheet name

 * are going to be the same for most cases.

 *

 * @since 1.5.0

 *

 * @return string Stylesheet name.

 */

function get_stylesheet() {

	/**

	 * Filters the name of current stylesheet.

	 *

	 * @since 1.5.0

	 *

	 * @param string $stylesheet Name of the current stylesheet.

	 */

	return apply_filters( 'stylesheet', get_option( 'stylesheet' ) );

}

/**

 * Retrieves stylesheet directory path for the active theme.

 *

 * @since 1.5.0

 *

 * @return string Path to active theme's stylesheet directory.

 */

function get_stylesheet_directory() {

	$stylesheet     = get_stylesheet();

	$theme_root     = get_theme_root( $stylesheet );

	$stylesheet_dir = "$theme_root/$stylesheet";

	/**

	 * Filters the stylesheet directory path for the active theme.

	 *

	 * @since 1.5.0

	 *

	 * @param string $stylesheet_dir Absolute path to the active theme.

	 * @param string $stylesheet     Directory name of the active theme.

	 * @param string $theme_root     Absolute path to themes directory.

	 */

	return apply_filters( 'stylesheet_directory', $stylesheet_dir, $stylesheet, $theme_root );

}

/**

 * Retrieves stylesheet directory URI for the active theme.

 *

 * @since 1.5.0

 *

 * @return string URI to active theme's stylesheet directory.

 */

function get_stylesheet_directory_uri() {

	$stylesheet         = str_replace( '%2F', '/', rawurlencode( get_stylesheet() ) );

	$theme_root_uri     = get_theme_root_uri( $stylesheet );

	$stylesheet_dir_uri = "$theme_root_uri/$stylesheet";

	/**

	 * Filters the stylesheet directory URI.

	 *

	 * @since 1.5.0

	 *

	 * @param string $stylesheet_dir_uri Stylesheet directory URI.

	 * @param string $stylesheet         Name of the activated theme's directory.

	 * @param string $theme_root_uri     Themes root URI.

	 */

	return apply_filters( 'stylesheet_directory_uri', $stylesheet_dir_uri, $stylesheet, $theme_root_uri );

}

/**

 * Retrieves stylesheet URI for the active theme.

 *

 * The stylesheet file name is 'style.css' which is appended to the stylesheet directory URI path.

 * See get_stylesheet_directory_uri().

 *

 * @since 1.5.0

 *

 * @return string URI to active theme's stylesheet.

 */

function get_stylesheet_uri() {

	$stylesheet_dir_uri = get_stylesheet_directory_uri();

	$stylesheet_uri     = $stylesheet_dir_uri . '/style.css';

	/**

	 * Filters the URI of the active theme stylesheet.

	 *

	 * @since 1.5.0

	 *

	 * @param string $stylesheet_uri     Stylesheet URI for the active theme/child theme.

	 * @param string $stylesheet_dir_uri Stylesheet directory URI for the active theme/child theme.

	 */

	return apply_filters( 'stylesheet_uri', $stylesheet_uri, $stylesheet_dir_uri );

}

/**

 * Retrieves the localized stylesheet URI.

 *

 * The stylesheet directory for the localized stylesheet files are located, by

 * default, in the base theme directory. The name of the locale file will be the

 * locale followed by '.css'. If that does not exist, then the text direction

 * stylesheet will be checked for existence, for example 'ltr.css'.

 *

 * The theme may change the location of the stylesheet directory by either using

 * the {@see 'stylesheet_directory_uri'} or {@see 'locale_stylesheet_uri'} filters.

 *

 * If you want to change the location of the stylesheet files for the entire

 * WordPress workflow, then change the former. If you just have the locale in a

 * separate folder, then change the latter.

 *

 * @since 2.1.0

 *

 * @global WP_Locale $wp_locale WordPress date and time locale object.

 *

 * @return string URI to active theme's localized stylesheet.

 */

function get_locale_stylesheet_uri() {

	global $wp_locale;

	$stylesheet_dir_uri = get_stylesheet_directory_uri();

	$dir                = get_stylesheet_directory();

	$locale             = get_locale();

	if ( file_exists( "$dir/$locale.css" ) ) {

		$stylesheet_uri = "$stylesheet_dir_uri/$locale.css";

	} elseif ( ! empty( $wp_locale->text_direction ) && file_exists( "$dir/{$wp_locale->text_direction}.css" ) ) {

		$stylesheet_uri = "$stylesheet_dir_uri/{$wp_locale->text_direction}.css";

	} else {

		$stylesheet_uri = '';

	}

	/**

	 * Filters the localized stylesheet URI.

	 *

	 * @since 2.1.0

	 *

	 * @param string $stylesheet_uri     Localized stylesheet URI.

	 * @param string $stylesheet_dir_uri Stylesheet directory URI.

	 */

	return apply_filters( 'locale_stylesheet_uri', $stylesheet_uri, $stylesheet_dir_uri );

}

/**

 * Retrieves name of the active theme.

 *

 * @since 1.5.0

 *

 * @return string Template name.

 */

function get_template() {

	/**

	 * Filters the name of the active theme.

	 *

	 * @since 1.5.0

	 *

	 * @param string $template active theme's directory name.

	 */

	return apply_filters( 'template', get_option( 'template' ) );

}

/**

 * Retrieves template directory path for the active theme.

 *

 * @since 1.5.0

 *

 * @return string Path to active theme's template directory.

 */

function get_template_directory() {

	$template     = get_template();

	$theme_root   = get_theme_root( $template );

	$template_dir = "$theme_root/$template";

	/**

	 * Filters the active theme directory path.

	 *

	 * @since 1.5.0

	 *

	 * @param string $template_dir The path of the active theme directory.

	 * @param string $template     Directory name of the active theme.

	 * @param string $theme_root   Absolute path to the themes directory.

	 */

	return apply_filters( 'template_directory', $template_dir, $template, $theme_root );

}

/**

 * Retrieves template directory URI for the active theme.

 *

 * @since 1.5.0

 *

 * @return string URI to active theme's template directory.

 */

function get_template_directory_uri() {

	$template         = str_replace( '%2F', '/', rawurlencode( get_template() ) );

	$theme_root_uri   = get_theme_root_uri( $template );

	$template_dir_uri = "$theme_root_uri/$template";

	/**

	 * Filters the active theme directory URI.

	 *

	 * @since 1.5.0

	 *

	 * @param string $template_dir_uri The URI of the active theme directory.

	 * @param string $template         Directory name of the active theme.

	 * @param string $theme_root_uri   The themes root URI.

	 */

	return apply_filters( 'template_directory_uri', $template_dir_uri, $template, $theme_root_uri );

}

/**

 * Retrieves theme roots.

 *

 * @since 2.9.0

 *

 * @global array $wp_theme_directories

 *

 * @return array|string An array of theme roots keyed by template/stylesheet

 *                      or a single theme root if all themes have the same root.

 */

function get_theme_roots() {

	global $wp_theme_directories;

	if ( ! is_array( $wp_theme_directories ) || count( $wp_theme_directories ) <= 1 ) {

		return '/themes';

	}

	$theme_roots = get_site_transient( 'theme_roots' );

	if ( false === $theme_roots ) {

		search_theme_directories( true ); // Regenerate the transient.

		$theme_roots = get_site_transient( 'theme_roots' );

	}

	return $theme_roots;

}

/**

 * Registers a directory that contains themes.

 *

 * @since 2.9.0

 *

 * @global array $wp_theme_directories

 *

 * @param string $directory Either the full filesystem path to a theme folder

 *                          or a folder within WP_CONTENT_DIR.

 * @return bool True if successfully registered a directory that contains themes,

 *              false if the directory does not exist.

 */

function register_theme_directory( $directory ) {

	global $wp_theme_directories;

	if ( ! file_exists( $directory ) ) {

		// Try prepending as the theme directory could be relative to the content directory.

		$directory = WP_CONTENT_DIR . '/' . $directory;

		// If this directory does not exist, return and do not register.

		if ( ! file_exists( $directory ) ) {

			return false;

		}

	}

	if ( ! is_array( $wp_theme_directories ) ) {

		$wp_theme_directories = array();

	}

	$untrailed = untrailingslashit( $directory );

	if ( ! empty( $untrailed ) && ! in_array( $untrailed, $wp_theme_directories, true ) ) {

		$wp_theme_directories[] = $untrailed;

	}

	return true;

}

/**

 * Searches all registered theme directories for complete and valid themes.

 *

 * @since 2.9.0

 *

 * @global array $wp_theme_directories

 *

 * @param bool $force Optional. Whether to force a new directory scan. Default false.

 * @return array|false Valid themes found on success, false on failure.

 */

function search_theme_directories( $force = false ) {

	global $wp_theme_directories;

	static $found_themes = null;

	if ( empty( $wp_theme_directories ) ) {

		return false;

	}

	if ( ! $force && isset( $found_themes ) ) {

		return $found_themes;

	}

	$found_themes = array();

	$wp_theme_directories = (array) $wp_theme_directories;

	$relative_theme_roots = array();

	/*

	 * Set up maybe-relative, maybe-absolute array of theme directories.

	 * We always want to return absolute, but we need to cache relative

	 * to use in get_theme_root().

	 */

	foreach ( $wp_theme_directories as $theme_root ) {

			$relative_theme_roots[ str_replace( WP_CONTENT_DIR, '', $theme_root ) ] = $theme_root;

		} else {

			$relative_theme_roots[ $theme_root ] = $theme_root;

		}

	}

	/**

	 * Filters whether to get the cache of the registered theme directories.

	 *

	 * @since 3.4.0

	 *

	 * @param bool   $cache_expiration Whether to get the cache of the theme directories. Default false.

	 * @param string $context          The class or function name calling the filter.

	 */

	$cache_expiration = apply_filters( 'wp_cache_themes_persistently', false, 'search_theme_directories' );

	if ( $cache_expiration ) {

		$cached_roots = get_site_transient( 'theme_roots' );

		if ( is_array( $cached_roots ) ) {

			foreach ( $cached_roots as $theme_dir => $theme_root ) {

				// A cached theme root is no longer around, so skip it.

				if ( ! isset( $relative_theme_roots[ $theme_root ] ) ) {

					continue;

				}

				$found_themes[ $theme_dir ] = array(