<?php

/**

 * Dependencies API: Styles functions

 *

 * @since 2.6.0

 *

 * @package WordPress

 * @subpackage Dependencies

 */

/**

 * Initialize $wp_styles if it has not been set.

 *

 * @global WP_Styles $wp_styles

 *

 * @since 4.2.0

 *

 * @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;

}

/**

 * Display 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.

 *

 * @global WP_Styles $wp_styles The WP_Styles object for printing styles.

 *

 * @since 2.6.0

 *

 * @param string|bool|array $handles Styles to be printed. Default 'false'.

 * @return array On success, a processed array of WP_Dependencies items; otherwise, an empty array.

 */

function wp_print_styles( $handles = false ) {

	if ( '' === $handles ) { // for wp_head

		$handles = false;

	}

	/**

	 * Fires before styles in the $handles queue are printed.

	 *

	 * @since 2.6.0

	 */

	if ( ! $handles ) {

		do_action( 'wp_print_styles' );

	}

	_wp_scripts_maybe_doing_it_wrong( __FUNCTION__ );

	global $wp_styles;

	if ( ! ( $wp_styles instanceof WP_Styles ) ) {

		if ( ! $handles ) {

			return array(); // No need to instantiate if nothing is there.

		}

	}

	return wp_styles()->do_items( $handles );

}

/**

 * Add extra CSS styles to a registered stylesheet.

 *

 * 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__ );

	if ( false !== stripos( $data, '</style>' ) ) {

		$data = trim( preg_replace( '#<style[^>]*>(.*)</style>#is', '$1', $data ) );

	}

	return wp_styles()->add_inline_style( $handle, $data );

}

/**

 * Register 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 array            $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 'all'. Accepts media types like 'all', 'print' and 'screen', or media queries like

 *                                 '(orientation: portrait)' and '(max-width: 640px)'.

 * @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 = 'all' ) {

	_wp_scripts_maybe_doing_it_wrong( __FUNCTION__ );

	return wp_styles()->add( $handle, $src, $deps, $ver, $media );

}

/**

 * Remove 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__ );

	wp_styles()->remove( $handle );

}

/**

 * Enqueue 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 array            $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 'all'. Accepts media types like 'all', 'print' and 'screen', or media queries like

 *                                 '(orientation: portrait)' and '(max-width: 640px)'.

 */

function wp_enqueue_style( $handle, $src = '', $deps = array(), $ver = false, $media = 'all' ) {

	_wp_scripts_maybe_doing_it_wrong( __FUNCTION__ );

	$wp_styles = wp_styles();

	if ( $src ) {

		$wp_styles->add( $_handle[0], $src, $deps, $ver, $media );

	}

	$wp_styles->enqueue( $handle );

}

/**

 * Remove 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__ );

	wp_styles()->dequeue( $handle );

}

/**

 * Check whether a CSS stylesheet has been added to the queue.

 *

 * @since 2.8.0

 *

 * @param string $handle Name of the stylesheet.

 * @param string $list   Optional. Status of the stylesheet to check. Default 'enqueued'.

 *                       Accepts 'enqueued', 'registered', 'queue', 'to_do', and 'done'.

 * @return bool Whether style is queued.

 */

function wp_style_is( $handle, $list = 'enqueued' ) {

	_wp_scripts_maybe_doing_it_wrong( __FUNCTION__ );

	return (bool) wp_styles()->query( $handle, $list );

}

/**

 * Add metadata to a CSS stylesheet.

 *

 * Works only if the stylesheet has already been added.

 *

 * Possible values for $key and $value:

 * 'conditional' string      Comments for IE 6, lte IE 7 etc.

 * 'rtl'         bool|string To declare an RTL stylesheet.

 * 'suffix'      string      Optional suffix, used in combination with RTL.

 * 'alt'         bool        For rel="alternate stylesheet".

 * 'title'       string      For preferred/alternate stylesheets.

 *

 * @see WP_Dependency::add_data()

 *

 * @since 3.6.0

 *

 * @param string $handle Name of the stylesheet.

 * @param string $key    Name of data point for which we're storing a value.

 *                       Accepts 'conditional', 'rtl' and 'suffix', 'alt' and 'title'.

 * @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()->add_data( $handle, $key, $value );

}