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/**
 * Dependencies API: Styles functions
 *
 * @since 2.6.0
 *
 * @package WordPress
 * @subpackage Dependencies
 */

/**
 * Initializes $wp_styles if it has not been set.
 *
 * @since 4.2.0
 *
 * @global WP_Styles $wp_styles
 *
 * @return WP_Styles WP_Styles instance.
 */
function wp_styles() {
	global $wp_styles;

	if ( ! ( $wp_styles instanceof WP_Styles ) ) {
		$wp_styles = new WP_Styles();
	}

	return $wp_styles;
}

/**
 * Displays styles that are in the $handles queue.
 *
 * Passing an empty array to $handles prints the queue,
 * passing an array with one string prints that style,
 * and passing an array of strings prints those styles.
 *
 * @since 2.6.0
 *
 * @global WP_Styles $wp_styles The WP_Styles object for printing styles.
 *
 * @param string|bool|array $handles Styles to be printed. Default &#039;false&#039;.
 * @return string[] On success, an array of handles of processed WP_Dependencies items; otherwise, an empty array.
 */
function wp_print_styles( $handles = false ) {
	global $wp_styles;

	if ( &#039;&#039; === $handles ) { // For &#039;wp_head&#039;.
		$handles = false;
	}

	if ( ! $handles ) {
		/**
		 * Fires before styles in the $handles queue are printed.
		 *
		 * @since 2.6.0
		 */
		do_action( &#039;wp_print_styles&#039; );
	}

	_wp_scripts_maybe_doing_it_wrong( __FUNCTION__ );

	if ( ! ( $wp_styles instanceof WP_Styles ) ) {
		if ( ! $handles ) {
			return array(); // No need to instantiate if nothing is there.
		}
	}

	return wp_styles()-&gt;do_items( $handles );
}

/**
 * Adds extra CSS styles to a registered stylesheet.
 *
 * Styles will only be added if the stylesheet is already in the queue.
 * Accepts a string $data containing the CSS. If two or more CSS code blocks
 * are added to the same stylesheet $handle, they will be printed in the order
 * they were added, i.e. the latter added styles can redeclare the previous.
 *
 * @see WP_Styles::add_inline_style()
 *
 * @since 3.3.0
 *
 * @param string $handle Name of the stylesheet to add the extra styles to.
 * @param string $data   String containing the CSS styles to be added.
 * @return bool True on success, false on failure.
 */
function wp_add_inline_style( $handle, $data ) {
	_wp_scripts_maybe_doing_it_wrong( __FUNCTION__, $handle );

	if ( false !== stripos( $data, &#039;&lt;/style&gt;&#039; ) ) {
		_doing_it_wrong(
			__FUNCTION__,
			sprintf(
				/* translators: 1: &lt;style&gt;, 2: wp_add_inline_style() */
				__( &#039;Do not pass %1$s tags to %2$s.&#039; ),
				&#039;&lt;code&gt;&amp;lt;style&amp;gt;&lt;/code&gt;&#039;,
				&#039;&lt;code&gt;wp_add_inline_style()&lt;/code&gt;&#039;
			),
			&#039;3.7.0&#039;
		);
		$data = trim( preg_replace( &#039;#&lt;style[^&gt;]*&gt;(.*)&lt;/style&gt;#is&#039;, &#039;$1&#039;, $data ) );
	}

	return wp_styles()-&gt;add_inline_style( $handle, $data );
}

/**
 * Registers a CSS stylesheet.
 *
 * @see WP_Dependencies::add()
 * @link https://www.w3.org/TR/CSS2/media.html#media-types List of CSS media types.
 *
 * @since 2.6.0
 * @since 4.3.0 A return value was added.
 *
 * @param string           $handle Name of the stylesheet. Should be unique.
 * @param string|false     $src    Full URL of the stylesheet, or path of the stylesheet relative to the WordPress root directory.
 *                                 If source is set to false, stylesheet is an alias of other stylesheets it depends on.
 * @param string[]         $deps   Optional. An array of registered stylesheet handles this stylesheet depends on. Default empty array.
 * @param string|bool|null $ver    Optional. String specifying stylesheet version number, if it has one, which is added to the URL
 *                                 as a query string for cache busting purposes. If version is set to false, a version
 *                                 number is automatically added equal to current installed WordPress version.
 *                                 If set to null, no version is added.
 * @param string           $media  Optional. The media for which this stylesheet has been defined.
 *                                 Default &#039;all&#039;. Accepts media types like &#039;all&#039;, &#039;print&#039; and &#039;screen&#039;, or media queries like
 *                                 &#039;(orientation: portrait)&#039; and &#039;(max-width: 640px)&#039;.
 * @return bool Whether the style has been registered. True on success, false on failure.
 */
function wp_register_style( $handle, $src, $deps = array(), $ver = false, $media = &#039;all&#039; ) {
	_wp_scripts_maybe_doing_it_wrong( __FUNCTION__, $handle );

	return wp_styles()-&gt;add( $handle, $src, $deps, $ver, $media );
}

/**
 * Removes a registered stylesheet.
 *
 * @see WP_Dependencies::remove()
 *
 * @since 2.1.0
 *
 * @param string $handle Name of the stylesheet to be removed.
 */
function wp_deregister_style( $handle ) {
	_wp_scripts_maybe_doing_it_wrong( __FUNCTION__, $handle );

	wp_styles()-&gt;remove( $handle );
}

/**
 * Enqueues a CSS stylesheet.
 *
 * Registers the style if source provided (does NOT overwrite) and enqueues.
 *
 * @see WP_Dependencies::add()
 * @see WP_Dependencies::enqueue()
 * @link https://www.w3.org/TR/CSS2/media.html#media-types List of CSS media types.
 *
 * @since 2.6.0
 *
 * @param string           $handle Name of the stylesheet. Should be unique.
 * @param string           $src    Full URL of the stylesheet, or path of the stylesheet relative to the WordPress root directory.
 *                                 Default empty.
 * @param string[]         $deps   Optional. An array of registered stylesheet handles this stylesheet depends on. Default empty array.
 * @param string|bool|null $ver    Optional. String specifying stylesheet version number, if it has one, which is added to the URL
 *                                 as a query string for cache busting purposes. If version is set to false, a version
 *                                 number is automatically added equal to current installed WordPress version.
 *                                 If set to null, no version is added.
 * @param string           $media  Optional. The media for which this stylesheet has been defined.
 *                                 Default &#039;all&#039;. Accepts media types like &#039;all&#039;, &#039;print&#039; and &#039;screen&#039;, or media queries like
 *                                 &#039;(orientation: portrait)&#039; and &#039;(max-width: 640px)&#039;.
 */
function wp_enqueue_style( $handle, $src = &#039;&#039;, $deps = array(), $ver = false, $media = &#039;all&#039; ) {
	_wp_scripts_maybe_doing_it_wrong( __FUNCTION__, $handle );

	$wp_styles = wp_styles();

	if ( $src ) {
		$_handle = explode( &#039;?&#039;, $handle );
		$wp_styles-&gt;add( $_handle[0], $src, $deps, $ver, $media );
	}

	$wp_styles-&gt;enqueue( $handle );
}

/**
 * Removes a previously enqueued CSS stylesheet.
 *
 * @see WP_Dependencies::dequeue()
 *
 * @since 3.1.0
 *
 * @param string $handle Name of the stylesheet to be removed.
 */
function wp_dequeue_style( $handle ) {
	_wp_scripts_maybe_doing_it_wrong( __FUNCTION__, $handle );

	wp_styles()-&gt;dequeue( $handle );
}

/**
 * Checks whether a CSS stylesheet has been added to the queue.
 *
 * @since 2.8.0
 *
 * @param string $handle Name of the stylesheet.
 * @param string $status Optional. Status of the stylesheet to check. Default &#039;enqueued&#039;.
 *                       Accepts &#039;enqueued&#039;, &#039;registered&#039;, &#039;queue&#039;, &#039;to_do&#039;, and &#039;done&#039;.
 * @return bool Whether style is queued.
 */
function wp_style_is( $handle, $status = &#039;enqueued&#039; ) {
	_wp_scripts_maybe_doing_it_wrong( __FUNCTION__, $handle );

	return (bool) wp_styles()-&gt;query( $handle, $status );
}

/**
 * Adds metadata to a CSS stylesheet.
 *
 * Works only if the stylesheet has already been registered.
 *
 * Possible values for $key and $value:
 * &#039;conditional&#039; string      Comments for IE 6, lte IE 7 etc.
 * &#039;rtl&#039;         bool|string To declare an RTL stylesheet.
 * &#039;suffix&#039;      string      Optional suffix, used in combination with RTL.
 * &#039;alt&#039;         bool        For rel=&quot;alternate stylesheet&quot;.
 * &#039;title&#039;       string      For preferred/alternate stylesheets.
 * &#039;path&#039;        string      The absolute path to a stylesheet. Stylesheet will
 *                           load inline when &#039;path&#039; is set.
 *
 * @see WP_Dependencies::add_data()
 *
 * @since 3.6.0
 * @since 5.8.0 Added &#039;path&#039; as an official value for $key.
 *              See {@see wp_maybe_inline_styles()}.
 *
 * @param string $handle Name of the stylesheet.
 * @param string $key    Name of data point for which we&#039;re storing a value.
 *                       Accepts &#039;conditional&#039;, &#039;rtl&#039; and &#039;suffix&#039;, &#039;alt&#039;, &#039;title&#039; and &#039;path&#039;.
 * @param mixed  $value  String containing the CSS data to be added.
 * @return bool True on success, false on failure.
 */
function wp_style_add_data( $handle, $key, $value ) {
	return wp_styles()-&gt;add_data( $handle, $key, $value );
}
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