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

<?php

class WP_Scripts extends WP_Dependencies {
    var $base_url; // Full URL with trailing slash
    var $default_version;

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

    /**
     * Prints scripts
     *
     * Prints the scripts passed to it or the print queue.  Also prints all necessary dependencies.
     *
     * @param mixed handles (optional) Scripts to be printed.  (void) prints queue, (string) prints that script, (array of strings) prints those scripts.
     * @return array Scripts that have been printed
     */
    function print_scripts( $handles = false ) {
        return $this->do_items( $handles );
    }

    function print_scripts_l10n( $handle ) {
        if ( empty($this->registered[$handle]->extra['l10n']) || empty($this->registered[$handle]->extra['l10n'][0]) || !is_array($this->registered[$handle]->extra['l10n'][1]) )
            return false;

        $object_name = $this->registered[$handle]->extra['l10n'][0];

        echo "<script type='text/javascript'>\n";
        echo "/* <![CDATA[ */\n";
        echo "\t$object_name = {\n";
        $eol = '';
        foreach ( $this->registered[$handle]->extra['l10n'][1] as $var => $val ) {
            echo "$eol\t\t$var: \"" . js_escape( $val ) . '"';
            $eol = ",\n";
        }
        echo "\n\t}\n";
        echo "/* ]]> */\n";
        echo "</script>\n";

        return true;
    }

    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];

        $src = $this->registered[$handle]->src;
        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 = clean_url(apply_filters( 'script_loader_src', $src, $handle ));

        $this->print_scripts_l10n( $handle );

        echo "<script type='text/javascript' src='$src'></script>\n";

        return true;
    }

    /**
     * Localizes a script
     *
     * Localizes only if script has already been added
     *
     * @param string handle Script name
     * @param string object_name Name of JS object to hold l10n info
     * @param array l10n Array of JS var name => localized string
     * @return bool Successful localization
     */
    function localize( $handle, $object_name, $l10n ) {
        if ( !$object_name || !$l10n )
            return false;
        return $this->add_data( $handle, 'l10n', array( $object_name, $l10n ) );
    }

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