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Template Code

// Arg processing
var errors = [];

// Data
var data = $0 ?? $data;

// Depth
var depth = $1 ?? $depth ?? 3;
if (depth is not num || depth < 0 || depth > 3) {
    let errors ..= [ "DEPTH must be a number in the range [0,3]" ];
    let depth = 0;
}
            
// Collapse
var collapse = $2 ?? $collapse ?? true;
if (collapse && !wiki.template("Template:@neilw/CollapseItem")) {
//if (collapse && !template.collapseitem) {
    let errors ..= [ "COLLAPSE option requires the CollapseItem template to be installed" ];
    let collapse = false;
}
                
// Print errors 
if (#errors) <div style="color:red; padding:10px; border:1px dotted red;">
    <strong> "PrettyPrint errors:" </strong>;
    <ul> foreach (var e in errors) <li> e </li>; </ul>;
</div>;
                        
// PrettyPrint!
var enclosers = { list: [ "[", "]" ], map: [ "{", "}" ] };
var d1 = data;
var display = "display: "..(collapse ? "none" : "block");
                    
// Level 1
var d1 = data;
<div>
    if (depth >= 1 && ((d1 is list || d1 is map) && #d1)) {
        var id1 = @id;
        var e1 = enclosers[typeof(d1)];
        e1[0];            
        if (collapse) wiki.template("Template:@neilw/CollapseItem", { item: "id1", effect: "slide" } );
        //if (collapse) CollapseItem(id1,_,_,"slide");
      <div style=(display) id=(id1)>
        var size1 = #d1-1;
        var set1 = (d1 is map ? list.sort(map.keys(d1)) : num.series(0, size1));
        foreach (var k1 in set1, var d2 = d1[k1], var last1=(__index==size1)) <div style="margin-left: 20px">
            var id2 = id1 .. "_" .. __index;
            if (d1 is map) k1..": ";
            if (depth >= 2 && ((d2 is list || d2 is map) && #d2)) {
                var e2 = enclosers[typeof(d2)];
                e2[0];
                if (collapse) wiki.template("Template:@neilw/CollapseItem", { item: "id2", effect: "slide" } );                
                //if (collapse) CollapseItem(id2,_,_,"slide");
              <div style=(display) id=(id2)>
                var size2 = #d2-1;
                var set2 = (d2 is map ? list.sort(map.keys(d2)) : num.series(0,size2));
                foreach (var k2 in set2, var d3 = d2[k2], var last2=(__index==size2)) <div style="margin-left: 20px">
                    var id3 = id2 .. "_" .. __index;
                    if (d2 is map) k2..": ";
                    if (depth >= 3 && ((d3 is list || d3 is map) && #d3)) {
                        var e3 = enclosers[typeof(d3)];
                        e3[0];
                        if (collapse) wiki.template("Template:@neilw/CollapseItem", { item: "id3", effect: "slide" } );
                        //if (collapse) CollapseItem(id3,_,_,"slide");
                      <div style=(display) id=(id3)>
                        var size3 = #d3 - 1;
                        var set3 = (d3 is map ? list.sort(map.keys(d3)) : num.series(0,size3));
                        foreach (var k3 in set3, var d4 = d3[k3], var last3=(__index==size3)) <div style="margin-left: 20px">
                            if (d3 is map) k3..": ";
                            json.emit(d4);
                            if (!last3) ",";
                        </div>;
                      </div>;
                        e3[1];
                    }
                    else json.emit(d3);
                    if (!last2) ",";
                </div>;
              </div>;
                e2[1];
            }
            else json.emit(d2);
            if (!last1) ",";
        </div>;
      </div>;
        e1[1];
    }
    else json.emit(d1);
</div>;