root/trunk/wp-includes/class.wp-styles.php

<?php
/**
 * BackPress Styles enqueue.
 *
 * These classes were refactored from the WordPress WP_Scripts and WordPress
 * script enqueue API.
 *
 * @package BackPress
 * @since r74
 */

/**
 * BackPress Styles enqueue class.
 *
 * @package BackPress
 * @uses WP_Dependencies
 * @since r74
 */
class WP_Styles extends WP_Dependencies {
    var $base_url;
    var $default_version;
    var $text_direction = 'ltr';

    function __construct() {
        do_action_ref_array( 'wp_default_styles', array(&$this) );
    }

    function do_item( $handle ) {
        if ( !parent::do_item($handle) )
            return false;

        $ver = $this->registered[$handle]->ver ? $this->registered[$handle]->ver : $this->default_version;
        if ( isset($this->args[$handle]) )
            $ver .= '&amp;' . $this->args[$handle];

        if ( isset($this->registered[$handle]->args) )
            $media = attribute_escape( $this->registered[$handle]->args );
        else
            $media = 'all';

        $href = $this->_css_href( $this->registered[$handle]->src, $ver, $handle );

        $end_cond = '';
        if ( isset($this->registered[$handle]->extra['conditional']) && $this->registered[$handle]->extra['conditional'] ) {
            echo "<!--[if {$this->registered[$handle]->extra['conditional']}]>\n";
            $end_cond = "<![endif]-->\n";
        }

        echo apply_filters( 'style_loader_tag', "<link rel='stylesheet' href='$href' type='text/css' media='$media' />\n", $handle );
        if ( 'rtl' === $this->text_direction && isset($this->registered[$handle]->extra['rtl']) && $this->registered[$handle]->extra['rtl'] ) {
            if ( is_bool( $this->registered[$handle]->extra['rtl'] ) )
                $rtl_href = str_replace( '.css', '-rtl.css', $href );
            else
                $rtl_href = $this->_css_href( $this->registered[$handle]->extra['rtl'], $ver, "$handle-rtl" );

            echo apply_filters( 'style_loader_tag', "<link rel='stylesheet' href='$rtl_href' type='text/css' media='$media' />\n", $handle );
        }

        echo $end_cond;

        // Could do something with $this->registered[$handle]->extra here to print out extra CSS rules
//        echo "<style type='text/css'>\n";
//        echo "/* <![CDATA[ */\n";
//        echo "/* ]]> */\n";
//        echo "</style>\n";

        return true;
    }

    function all_deps( $handles, $recursion = false ) {
        $r = parent::all_deps( $handles, $recursion );
        if ( !$recursion )
            $this->to_do = apply_filters( 'print_styles_array', $this->to_do );
        return $r;
    }

    function _css_href( $src, $ver, $handle ) {
        if ( !preg_match('|^https?://|', $src) && !preg_match('|^' . preg_quote(WP_CONTENT_URL) . '|', $src) ) {
            $src = $this->base_url . $src;
        }

        $src = add_query_arg('ver', $ver, $src);
        $src = apply_filters( 'style_loader_src', $src, $handle );
        return clean_url( $src );
    }

}