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#!../astl-calc-step1/astl-ulmcalc-free

sub descend(nestlevel, node) {
    var result = "";
    if (isoperator(node)) {
        result = " " x nestlevel & "{ name: \"" & operator(node) & "\"";
        if (len(node) > 0) {
            result = result & ",\n" & " " x nestlevel & "  children: [";
            foreach operand in (node) {
                result = result & "\n" & descend(nestlevel + 3, operand) & ",";
            }
            result = result & "\n" & " " x nestlevel & "  ]\n";
        }
        result = result & " " x nestlevel & "}";
        // result = result & " @" & location(node);
    } else {
        var val = tokenliteral(node);
        var res;
        if (res = val =~ m{"(.*)"}) {
            val = "\\\"" & res[0] & "\\\"";
        }
        result = " " x nestlevel & "{ name: \"" & val & "\" }";
    }
    return result;
}

sub usage {
    var msg = "Usage: " & cmdname & " infile ";
    println(stderr, msg);
    exit(1);
}


sub main(argv) {
    var unit = root;

    // process command line
    var units = [];
    while (len(argv) > 0) {
        var input_file = pop(argv);

        // parse input file
        var input = open(input_file);
        if (!input) {
            println(stderr, input_file, ": cannot open for reading"); exit(1);
        }
        var res = parse(input);
        if (type(res) == "string") {
            println(stderr, res); exit(1);
        }
        push(units, res);
    }

    if (len(units) == 1) {
        root = units[0];
    } else {
        root = join(units);
    }

    println("const treeData =\n" & descend(4, root) & ";");
}