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/**
 * Dependencies API: WP_Styles class
 *
 * @since 2.6.0
 *
 * @package WordPress
 * @subpackage Dependencies
 */

/**
 * Core class used to register styles.
 *
 * @since 2.6.0
 *
 * @see WP_Dependencies
 */
class WP_Styles extends WP_Dependencies {
	/**
	 * Base URL for styles.
	 *
	 * Full URL with trailing slash.
	 *
	 * @since 2.6.0
	 * @var string
	 */
	public $base_url;

	/**
	 * URL of the content directory.
	 *
	 * @since 2.8.0
	 * @var string
	 */
	public $content_url;

	/**
	 * Default version string for stylesheets.
	 *
	 * @since 2.6.0
	 * @var string
	 */
	public $default_version;

	/**
	 * The current text direction.
	 *
	 * @since 2.6.0
	 * @var string
	 */
	public $text_direction = &#039;ltr&#039;;

	/**
	 * Holds a list of style handles which will be concatenated.
	 *
	 * @since 2.8.0
	 * @var string
	 */
	public $concat = &#039;&#039;;

	/**
	 * Holds a string which contains style handles and their version.
	 *
	 * @since 2.8.0
	 * @deprecated 3.4.0
	 * @var string
	 */
	public $concat_version = &#039;&#039;;

	/**
	 * Whether to perform concatenation.
	 *
	 * @since 2.8.0
	 * @var bool
	 */
	public $do_concat = false;

	/**
	 * Holds HTML markup of styles and additional data if concatenation
	 * is enabled.
	 *
	 * @since 2.8.0
	 * @var string
	 */
	public $print_html = &#039;&#039;;

	/**
	 * Holds inline styles if concatenation is enabled.
	 *
	 * @since 3.3.0
	 * @var string
	 */
	public $print_code = &#039;&#039;;

	/**
	 * List of default directories.
	 *
	 * @since 2.8.0
	 * @var array
	 */
	public $default_dirs;

	/**
	 * Holds a string which contains the type attribute for style tag.
	 *
	 * If the active theme does not declare HTML5 support for &#039;style&#039;,
	 * then it initializes as `type=&#039;text/css&#039;`.
	 *
	 * @since 5.3.0
	 * @var string
	 */
	private $type_attr = &#039;&#039;;

	/**
	 * Constructor.
	 *
	 * @since 2.6.0
	 */
	public function __construct() {
		if (
			function_exists( &#039;is_admin&#039; ) &amp;&amp; ! is_admin()
		&amp;&amp;
			function_exists( &#039;current_theme_supports&#039; ) &amp;&amp; ! current_theme_supports( &#039;html5&#039;, &#039;style&#039; )
		) {
			$this-&gt;type_attr = &quot; type=&#039;text/css&#039;&quot;;
		}

		/**
		 * Fires when the WP_Styles instance is initialized.
		 *
		 * @since 2.6.0
		 *
		 * @param WP_Styles $wp_styles WP_Styles instance (passed by reference).
		 */
		do_action_ref_array( &#039;wp_default_styles&#039;, array( &amp;$this ) );
	}

	/**
	 * Processes a style dependency.
	 *
	 * @since 2.6.0
	 * @since 5.5.0 Added the `$group` parameter.
	 *
	 * @see WP_Dependencies::do_item()
	 *
	 * @param string    $handle The style&#039;s registered handle.
	 * @param int|false $group  Optional. Group level: level (int), no groups (false).
	 *                          Default false.
	 * @return bool True on success, false on failure.
	 */
	public function do_item( $handle, $group = false ) {
		if ( ! parent::do_item( $handle ) ) {
			return false;
		}

		$obj = $this-&gt;registered[ $handle ];

		if ( null === $obj-&gt;ver ) {
			$ver = &#039;&#039;;
		} else {
			$ver = $obj-&gt;ver ? $obj-&gt;ver : $this-&gt;default_version;
		}

		if ( isset( $this-&gt;args[ $handle ] ) ) {
			$ver = $ver ? $ver . &#039;&amp;amp;&#039; . $this-&gt;args[ $handle ] : $this-&gt;args[ $handle ];
		}

		$src         = $obj-&gt;src;
		$cond_before = &#039;&#039;;
		$cond_after  = &#039;&#039;;
		$conditional = isset( $obj-&gt;extra[&#039;conditional&#039;] ) ? $obj-&gt;extra[&#039;conditional&#039;] : &#039;&#039;;

		if ( $conditional ) {
			$cond_before = &quot;&lt;!--[if {$conditional}]&gt;\n&quot;;
			$cond_after  = &quot;&lt;![endif]--&gt;\n&quot;;
		}

		$inline_style = $this-&gt;print_inline_style( $handle, false );

		if ( $inline_style ) {
			$inline_style_tag = sprintf(
				&quot;&lt;style id=&#039;%s-inline-css&#039;%s&gt;\n%s\n&lt;/style&gt;\n&quot;,
				esc_attr( $handle ),
				$this-&gt;type_attr,
				$inline_style
			);
		} else {
			$inline_style_tag = &#039;&#039;;
		}

		if ( $this-&gt;do_concat ) {
			if ( $this-&gt;in_default_dir( $src ) &amp;&amp; ! $conditional &amp;&amp; ! isset( $obj-&gt;extra[&#039;alt&#039;] ) ) {
				$this-&gt;concat         .= &quot;$handle,&quot;;
				$this-&gt;concat_version .= &quot;$handle$ver&quot;;

				$this-&gt;print_code .= $inline_style;

				return true;
			}
		}

		if ( isset( $obj-&gt;args ) ) {
			$media = esc_attr( $obj-&gt;args );
		} else {
			$media = &#039;all&#039;;
		}

		// A single item may alias a set of items, by having dependencies, but no source.
		if ( ! $src ) {
			if ( $inline_style_tag ) {
				if ( $this-&gt;do_concat ) {
					$this-&gt;print_html .= $inline_style_tag;
				} else {
					echo $inline_style_tag;
				}
			}

			return true;
		}

		$href = $this-&gt;_css_href( $src, $ver, $handle );
		if ( ! $href ) {
			return true;
		}

		$rel   = isset( $obj-&gt;extra[&#039;alt&#039;] ) &amp;&amp; $obj-&gt;extra[&#039;alt&#039;] ? &#039;alternate stylesheet&#039; : &#039;stylesheet&#039;;
		$title = isset( $obj-&gt;extra[&#039;title&#039;] ) ? sprintf( &quot; title=&#039;%s&#039;&quot;, esc_attr( $obj-&gt;extra[&#039;title&#039;] ) ) : &#039;&#039;;

		$tag = sprintf(
			&quot;&lt;link rel=&#039;%s&#039; id=&#039;%s-css&#039;%s href=&#039;%s&#039;%s media=&#039;%s&#039; /&gt;\n&quot;,
			$rel,
			$handle,
			$title,
			$href,
			$this-&gt;type_attr,
			$media
		);

		/**
		 * Filters the HTML link tag of an enqueued style.
		 *
		 * @since 2.6.0
		 * @since 4.3.0 Introduced the `$href` parameter.
		 * @since 4.5.0 Introduced the `$media` parameter.
		 *
		 * @param string $tag    The link tag for the enqueued style.
		 * @param string $handle The style&#039;s registered handle.
		 * @param string $href   The stylesheet&#039;s source URL.
		 * @param string $media  The stylesheet&#039;s media attribute.
		 */
		$tag = apply_filters( &#039;style_loader_tag&#039;, $tag, $handle, $href, $media );

		if ( &#039;rtl&#039; === $this-&gt;text_direction &amp;&amp; isset( $obj-&gt;extra[&#039;rtl&#039;] ) &amp;&amp; $obj-&gt;extra[&#039;rtl&#039;] ) {
			if ( is_bool( $obj-&gt;extra[&#039;rtl&#039;] ) || &#039;replace&#039; === $obj-&gt;extra[&#039;rtl&#039;] ) {
				$suffix   = isset( $obj-&gt;extra[&#039;suffix&#039;] ) ? $obj-&gt;extra[&#039;suffix&#039;] : &#039;&#039;;
				$rtl_href = str_replace( &quot;{$suffix}.css&quot;, &quot;-rtl{$suffix}.css&quot;, $this-&gt;_css_href( $src, $ver, &quot;$handle-rtl&quot; ) );
			} else {
				$rtl_href = $this-&gt;_css_href( $obj-&gt;extra[&#039;rtl&#039;], $ver, &quot;$handle-rtl&quot; );
			}

			$rtl_tag = sprintf(
				&quot;&lt;link rel=&#039;%s&#039; id=&#039;%s-rtl-css&#039;%s href=&#039;%s&#039;%s media=&#039;%s&#039; /&gt;\n&quot;,
				$rel,
				$handle,
				$title,
				$rtl_href,
				$this-&gt;type_attr,
				$media
			);

			/** This filter is documented in wp-includes/class-wp-styles.php */
			$rtl_tag = apply_filters( &#039;style_loader_tag&#039;, $rtl_tag, $handle, $rtl_href, $media );

			if ( &#039;replace&#039; === $obj-&gt;extra[&#039;rtl&#039;] ) {
				$tag = $rtl_tag;
			} else {
				$tag .= $rtl_tag;
			}
		}

		if ( $this-&gt;do_concat ) {
			$this-&gt;print_html .= $cond_before;
			$this-&gt;print_html .= $tag;
			if ( $inline_style_tag ) {
				$this-&gt;print_html .= $inline_style_tag;
			}
			$this-&gt;print_html .= $cond_after;
		} else {
			echo $cond_before;
			echo $tag;
			$this-&gt;print_inline_style( $handle );
			echo $cond_after;
		}

		return true;
	}

	/**
	 * Adds extra CSS styles to a registered stylesheet.
	 *
	 * @since 3.3.0
	 *
	 * @param string $handle The style&#039;s registered handle.
	 * @param string $code   String containing the CSS styles to be added.
	 * @return bool True on success, false on failure.
	 */
	public function add_inline_style( $handle, $code ) {
		if ( ! $code ) {
			return false;
		}

		$after = $this-&gt;get_data( $handle, &#039;after&#039; );
		if ( ! $after ) {
			$after = array();
		}

		$after[] = $code;

		return $this-&gt;add_data( $handle, &#039;after&#039;, $after );
	}

	/**
	 * Prints extra CSS styles of a registered stylesheet.
	 *
	 * @since 3.3.0
	 *
	 * @param string $handle  The style&#039;s registered handle.
	 * @param bool   $display Optional. Whether to print the inline style
	 *                        instead of just returning it. Default true.
	 * @return string|bool False if no data exists, inline styles if `$display` is true,
	 *                     true otherwise.
	 */
	public function print_inline_style( $handle, $display = true ) {
		$output = $this-&gt;get_data( $handle, &#039;after&#039; );

		if ( empty( $output ) ) {
			return false;
		}

		$output = implode( &quot;\n&quot;, $output );

		if ( ! $display ) {
			return $output;
		}

		printf(
			&quot;&lt;style id=&#039;%s-inline-css&#039;%s&gt;\n%s\n&lt;/style&gt;\n&quot;,
			esc_attr( $handle ),
			$this-&gt;type_attr,
			$output
		);

		return true;
	}

	/**
	 * Determines style dependencies.
	 *
	 * @since 2.6.0
	 *
	 * @see WP_Dependencies::all_deps()
	 *
	 * @param string|string[] $handles   Item handle (string) or item handles (array of strings).
	 * @param bool            $recursion Optional. Internal flag that function is calling itself.
	 *                                   Default false.
	 * @param int|false       $group     Optional. Group level: level (int), no groups (false).
	 *                                   Default false.
	 * @return bool True on success, false on failure.
	 */
	public function all_deps( $handles, $recursion = false, $group = false ) {
		$r = parent::all_deps( $handles, $recursion, $group );
		if ( ! $recursion ) {
			/**
			 * Filters the array of enqueued styles before processing for output.
			 *
			 * @since 2.6.0
			 *
			 * @param string[] $to_do The list of enqueued style handles about to be processed.
			 */
			$this-&gt;to_do = apply_filters( &#039;print_styles_array&#039;, $this-&gt;to_do );
		}
		return $r;
	}

	/**
	 * Generates an enqueued style&#039;s fully-qualified URL.
	 *
	 * @since 2.6.0
	 *
	 * @param string $src    The source of the enqueued style.
	 * @param string $ver    The version of the enqueued style.
	 * @param string $handle The style&#039;s registered handle.
	 * @return string Style&#039;s fully-qualified URL.
	 */
	public function _css_href( $src, $ver, $handle ) {
		if ( ! is_bool( $src ) &amp;&amp; ! preg_match( &#039;|^(https?:)?//|&#039;, $src ) &amp;&amp; ! ( $this-&gt;content_url &amp;&amp; str_starts_with( $src, $this-&gt;content_url ) ) ) {
			$src = $this-&gt;base_url . $src;
		}

		if ( ! empty( $ver ) ) {
			$src = add_query_arg( &#039;ver&#039;, $ver, $src );
		}

		/**
		 * Filters an enqueued style&#039;s fully-qualified URL.
		 *
		 * @since 2.6.0
		 *
		 * @param string $src    The source URL of the enqueued style.
		 * @param string $handle The style&#039;s registered handle.
		 */
		$src = apply_filters( &#039;style_loader_src&#039;, $src, $handle );
		return esc_url( $src );
	}

	/**
	 * Whether a handle&#039;s source is in a default directory.
	 *
	 * @since 2.8.0
	 *
	 * @param string $src The source of the enqueued style.
	 * @return bool True if found, false if not.
	 */
	public function in_default_dir( $src ) {
		if ( ! $this-&gt;default_dirs ) {
			return true;
		}

		foreach ( (array) $this-&gt;default_dirs as $test ) {
			if ( str_starts_with( $src, $test ) ) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Processes items and dependencies for the footer group.
	 *
	 * HTML 5 allows styles in the body, grab late enqueued items and output them in the footer.
	 *
	 * @since 3.3.0
	 *
	 * @see WP_Dependencies::do_items()
	 *
	 * @return string[] Handles of items that have been processed.
	 */
	public function do_footer_items() {
		$this-&gt;do_items( false, 1 );
		return $this-&gt;done;
	}

	/**
	 * Resets class properties.
	 *
	 * @since 3.3.0
	 */
	public function reset() {
		$this-&gt;do_concat      = false;
		$this-&gt;concat         = &#039;&#039;;
		$this-&gt;concat_version = &#039;&#039;;
		$this-&gt;print_html     = &#039;&#039;;
	}
}
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