<?php

/**

 * BackPress Styles Procedural API

 *

 * @since 2.6.0

 *

 * @package WordPress

 * @subpackage BackPress

 */

/**

 * 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.

 *

 * @see do_action() Calls 'wp_print_styles' hook.

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

 *

 * @since 2.6.0

 *

 * @param array|bool $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;

	if ( ! $handles )

		do_action( 'wp_print_styles' );

	global $wp_styles;

	if ( ! is_a( $wp_styles, 'WP_Styles' ) ) {

		if ( ! did_action( 'init' ) )

			_doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),

				'<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

		if ( !$handles )

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

		else

			$wp_styles = new WP_Styles();

	}

	return $wp_styles->do_items( $handles );

}

/**

 * Add extra CSS styles to a registered stylesheet.

 *

 * Styles will only be added if the stylesheet in 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()

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

 *

 * @since 3.3.0

 *

 * @param string $handle Name of the stylesheet to add the extra styles to. Must be lowercase.

 * @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 ) {

	global $wp_styles;

	if ( ! is_a( $wp_styles, 'WP_Styles' ) ) {

		if ( ! did_action( 'init' ) )

			_doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),

				'<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

		$wp_styles = new WP_Styles();

	}

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

		_doing_it_wrong( __FUNCTION__, 'Do not pass style tags to wp_add_inline_style().', '3.7' );

		$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 http://www.w3.org/TR/CSS2/media.html#media-types List of CSS media types.

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

 *

 * @since 2.6.0

 *

 * @param string      $handle Name of the stylesheet.

 * @param string|bool $src    Path to the stylesheet from the WordPress root directory. Example: '/css/mystyle.css'.

 * @param array       $deps   An array of registered style handles this stylesheet depends on. Default empty array.

 * @param string|bool $ver    String specifying the stylesheet version number. Used to ensure that the correct version

 *                            is sent to the client regardless of caching. Default 'false'. Accepts 'false', 'null', or 'string'.

 * @param string      $media  Optional. The media for which this stylesheet has been defined.

 *                            Default 'all'. Accepts 'all', 'aural', 'braille', 'handheld', 'projection', 'print',

 *                            'screen', 'tty', or 'tv'.

 */

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

	global $wp_styles;

	if ( ! is_a( $wp_styles, 'WP_Styles' ) ) {

		if ( ! did_action( 'init' ) )

			_doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),

				'<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

		$wp_styles = new WP_Styles();

	}

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

}

/**

 * Remove a registered stylesheet.

 *

 * @see WP_Dependencies::remove()

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

 *

 * @since 2.1.0

 *

 * @param string $handle Name of the stylesheet to be removed.

 */

function wp_deregister_style( $handle ) {

	global $wp_styles;

	if ( ! is_a( $wp_styles, 'WP_Styles' ) ) {

		if ( ! did_action( 'init' ) )

			_doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),

				'<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

		$wp_styles = new WP_Styles();

	}

	$wp_styles->remove( $handle );

}

/**

 * Enqueue a CSS stylesheet.

 *

 * Registers the style if source provided (does NOT overwrite) and enqueues.

 *

 * @see WP_Dependencies::add(), WP_Dependencies::enqueue()

 * @link http://www.w3.org/TR/CSS2/media.html#media-types List of CSS media types.

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

 *

 * @since 2.6.0

 *

 * @param string      $handle Name of the stylesheet.

 * @param string|bool $src    Path to the stylesheet from the root directory of WordPress. Example: '/css/mystyle.css'.

 * @param array       $deps   An array of registered style handles this stylesheet depends on. Default empty array.

 * @param string|bool $ver    String specifying the stylesheet version number, if it has one. This parameter is used

 *                            to ensure that the correct version is sent to the client regardless of caching, and so

 *                            should be included if a version number is available and makes sense for the stylesheet.

 * @param string      $media  Optional. The media for which this stylesheet has been defined.

 *                            Default 'all'. Accepts 'all', 'aural', 'braille', 'handheld', 'projection', 'print',

 *                            'screen', 'tty', or 'tv'.

 */

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

	global $wp_styles;

	if ( ! is_a( $wp_styles, 'WP_Styles' ) ) {

		if ( ! did_action( 'init' ) )

			_doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),

				'<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

		$wp_styles = new WP_Styles();

	}

	if ( $src ) {

		$_handle = explode('?', $handle);

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

	}

	$wp_styles->enqueue( $handle );

}

/**

 * Remove a previously enqueued CSS stylesheet.

 *

 * @see WP_Dependencies::dequeue()

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

 *

 * @since 3.1.0

 *

 * @param string $handle Name of the stylesheet to be removed.

 */

function wp_dequeue_style( $handle ) {

	global $wp_styles;

	if ( ! is_a( $wp_styles, 'WP_Styles' ) ) {

		if ( ! did_action( 'init' ) )

			_doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),

				'<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

		$wp_styles = new WP_Styles();

	}

	$wp_styles->dequeue( $handle );

}

/**

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

 *

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

 *

 * @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' ) {

	global $wp_styles;

	if ( ! is_a( $wp_styles, 'WP_Styles' ) ) {

		if ( ! did_action( 'init' ) )

			_doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),

				'<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

		$wp_styles = new WP_Styles();

	}

	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  $data   String containing the CSS data to be added.

 * @return bool True on success, false on failure.

 */

function wp_style_add_data( $handle, $key, $value ) {

	global $wp_styles;

	return $wp_styles->add_data( $handle, $key, $value );

}