HideElements

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// HideElements
// by neilw, 2009-2011
//
// 1.10    3/22/2011   neilw    - added "ratings" option to hide page ratings
//                              - accepts a single string arg rather than a list of one item
// 1.00    8/3/2009    neilw    first release
//
// Usage:  HideElements(elements, byuser)
//    elements:    list of strings OR "all".  If list of strings, each indicating an element to hide:
//        "tags"          page tags
//        "files"         list of attached files
//        "images",       gallery of attached images
//        "comments",     comments at bottom of page
//        "ratings_top"   page ratings at top right corner of page
//        "ratings_bot"   page ratings at bottom of page
//        "ratings"       page ratings at top and bottom of page
//        "all"           all of the above
//    byuser:      hide the above elements only for users without write permission on the page
//

var allowed_elements = {
    tags:            "div.pageInfo",
    files:           "div.file",
    images:          "div.gallery",
    comments:        "div#comments",
    ratings_top:     "div#deki-page-rating-bar",
    ratings_bottom:  "dd.pageRatings,dt.pageRatings",
    ratings:         "div#deki-page-rating-bar,dd.pageRatings,dt.pageRatings"
};

var elements = $0 ?? $elements;
if (elements is not list) let elements = [ elements ];
var byuser = $1 ?? $byuser ?? false;

var selectors = [];
var errors = [];

foreach (var e in elements) {
    if (e == "all") {
        let selectors = list.select(map.values(allowed_elements), "string.indexof($,'_')<0");
        break;
    }
    else if (e is not str || !#allowed_elements[e])
        let errors ..= [ e ];
    else
        let selectors ..= [ allowed_elements[e] ];
}

<html>
if (#selectors && (!byuser || !wiki.pagepermissions().update)) {
    <head>
        <style type="text/css"> string.join(selectors, ",").."{ display:none; }" </style>;
    </head>;
}
if (#errors) {
    <body>
        <div>
            "ERROR: HidePageElements: bad element(s): " .. string.serialize(errors) .. "; allowed elements are:";
            <ul> foreach (var ae in map.keys(allowed_elements)) <li> ae </li>; </ul>;
        </div>;
    </body>;
}
</html>;

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