deploy.php

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    /*** This function will return a tree of manifests (xmlized) as they are
     *   found and extracted from one manifest file. The first manifest in the
     *   will be the main one, while the rest will be submanifests. In the
     *   future (when IMS CP suppors it, external submanifest will be detected
     *   and retrieved here too). See IMS specs for more info.
     */
    function ims_extract_manifests($data) {

        $manifest = new stdClass;    //To store found manifests in a tree structure

    /// If there are some manifests
        if (!empty($data['manifest'])) {
        /// Add manifest to results array
            $manifest->data = $data['manifest'];
        /// Look for submanifests
            $submanifests = ims_extract_submanifests($data['manifest']['#']);
        /// Add them as child
            if (!empty($submanifests)) {
                $manifest->childs = $submanifests;
            }
        }
    /// Return tree of manifests found
        return $manifest;
    }

    /* This function will search recursively for submanifests returning an array
     * containing them (xmlized) following a tree structure.
     */
    function ims_extract_submanifests($data) {

        $submanifests = array();  //To store found submanifests

    /// If there are some manifests
        if (!empty($data['manifest'])) {
        /// Get them
            foreach ($data['manifest'] as $submanifest) {
            /// Create a new submanifest object
                $submanifest_object = new stdClass;
                $submanifest_object->data = $submanifest;
            /// Look for more submanifests recursively
                $moresubmanifests = ims_extract_submanifests($submanifest['#']);
            /// Add them to results array
                if (!empty($moresubmanifests)) {
                    $submanifest_object->childs = $moresubmanifests;
                }
            /// Add submanifest object to results array
                $submanifests[] = $submanifest_object;
            }
        }
    /// Return array of manifests found
        return $submanifests;
    }

    /*** This function will return an ordered and nested array of items
     *   that is a perfect representation of the prefered organization
     */
    function ims_process_organizations($data) {

        global $CFG;

    /// Get the default organization
        $default_organization = $data['@']['default'];
        debugging('default_organization: '.$default_organization);

    /// Iterate (reverse) over organizations until we find the default one
        if (empty($data['#']['organization'])) {  /// Verify <organization> exists
            return false;
        }
        $count_organizations = count($data['#']['organization']);
        debugging('count_organizations: '.$count_organizations);

        $current_organization = $count_organizations - 1;
        while ($current_organization >= 0) {
        /// Load organization and check it
            $organization = $data['#']['organization'][$current_organization];
            if ($organization['@']['identifier'] == $default_organization) {
                    $current_organization = -1;   //Match, so exit.
            }
            $current_organization--;
        }

    /// At this point we MUST have the final organization
        debugging('final organization: '.$organization['#']['title'][0]['#']);
        if (empty($organization)) {
            return false;    //Error, no organization found
        }

    /// Extract items map from organization
        $items = $organization['#']['item'];
        if (empty($organization['#']['item'])) {  /// Verify <item> exists
            return false;
        }
        if (!$itemmap = ims_process_items($items)) {
            return false;    //Error, no items found
        }
        return $itemmap;
    }

    /*** This function gets the xmlized representation of the items
     *   and returns an array of items, ordered, with level and info
     */
    function ims_process_items($items, $level = 1, $id = 1, $parent = 0) {
        global $CFG;

        $itemmap = array();

    /// Iterate over items from start to end
        $count_items = count($items);
        debugging('level '.$level.'-count_items: '.$count_items);

        $current_item = 0;
        while ($current_item < $count_items) {
        /// Load item 
            $item = $items[$current_item];
            $obj_item = new stdClass;
            $obj_item->title         = $item['#']['title'][0]['#'];
            $obj_item->identifier    = $item['@']['identifier'];
            $obj_item->identifierref = $item['@']['identifierref'];
            $obj_item->id            = $id;
            $obj_item->level         = $level;
            $obj_item->parent        = $parent;
        /// Only if the item has everything
            if (!empty($obj_item->title) && 
                !empty($obj_item->identifier)) {
            /// Add to itemmap
                $itemmap[$id] = $obj_item;
                debugging('level '.$level.'-id '.$id.'-parent '.$parent.'-'.$obj_item->title);
            /// Counters go up
                $id++;
            /// Check for subitems recursively
                $subitems = $item['#']['item'];
                if (count($subitems)) {
                /// Recursive call
                    $subitemmap = ims_process_items($subitems, $level+1, $id, $obj_item->id);
                /// Add at the end and counters if necessary
                    if ($count_subitems = count($subitemmap)) {
                        foreach ($subitemmap as $subitem) {
                        /// Add the subitem to the main items array
                            $itemmap[$subitem->id] = $subitem;
                        /// Counters go up
                            $id++;
                        }
                    }
                }
            }
            $current_item++;
        }
        return $itemmap;
    }

    /*** This function will load an array of resources to be used later. 
     *   Keys are identifiers
     */
    function ims_load_resources($data, $manifest_base, $resources_base) {
        global $CFG;

        $resources = array();

        if (empty($data)) {  /// Verify <resource> exists
            return false;
        }
        $count_resources = count($data);
        debugging('count_resources: '.$count_resources);

        $current_resource = 0;
        while ($current_resource < $count_resources) {
        /// Load resource 
            $resource = $data[$current_resource];

        /// Create a new object resource
            $obj_resource = new stdClass;
            $obj_resource->identifier = $resource['@']['identifier'];
            $obj_resource->resource_base = $resource['@']['xml:base'];
            $obj_resource->href = $resource['@']['href'];
            if (empty($obj_resource->href)) {
                $obj_resource->href = $resource['#']['file']['0']['@']['href'];
            }
            
        /// Some packages are poorly done and use \ in roots. This makes them 
        /// not display since the URLs are not valid.
            if (!empty($obj_resource->href)) {
                $obj_resource->href = strtr($obj_resource->href, "\\", '/');    
            }
            
        /// Only if the resource has everything
            if (!empty($obj_resource->identifier) &&
                !empty($obj_resource->href)) {
            /// Add to resources (identifier as key)
            /// Depending of $manifest_base, $resources_base and the particular
            /// $resource_base variable, concatenate them to build the correct href
                $href_base = '';
                if (!empty($manifest_base)) {
                    $href_base = $manifest_base;
                }
                if (!empty($resources_base)) {
                    $href_base .= $resources_base;
                }
                if (!empty($obj_resource->resource_base)) {
                    $href_base .= $obj_resource->resource_base;
                }
                $resources[$obj_resource->identifier] = $href_base.$obj_resource->href;
            }
        /// Counters go up
            $current_resource++;
        }
        return $resources;
    }

?>