%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/keys { % dict -> array of dict keys
    [ exch
      {
          pop
      } forall
    ]
} bind def

/test.end {
    ( ) print
    test.count 0 gt {
        (Passed ) print
        test.pass (...) cvs print
        (/) print
        test.count (...) cvs print
        ( \() print
        test.pass 100 mul test.count idiv (...) cvs print
        (%\)) print
        (\r\n) print
    } if
} bind def

/test.start {
    print (:) print
    /test.pass 0 def
    /test.count 0 def
} bind def

/test {
    /test.count test.count 1 add def
    {
        /test.pass test.pass 1 add def
    } {
        ( ) print
        test.count (....) cvs print
        (-fail) print
    } ifelse
} bind def


% end included library code

/arrayloops {
    0 dict begin
    /a exch def
    /loop_id 0 def
    /loops 0 dict def
    a {
        /origin exch def
        loops origin known not {
            /li 0 def
            /thisloop 0 dict def
            /x origin def
            {
                x 0 lt x a length ge or {
                    exit
                } if
                thisloop x true put
                /x a x get def
                loops x known {
                    /li loops x get def
                    exit
                } if
                thisloop x known {
                    /loop_id loop_id 1 add def
                    /li loop_id def
                    exit
                } if
            } loop
            thisloop keys {
                loops exch li put
            } forall
        } if
    } forall
    loop_id
    end
} bind def

(arrayloops) test.start
[4 6 3 8 15 0 13 18 7 16 14 19 17 5 11 1 12 2 9 10] arrayloops 3 eq test
[0 1 13 7 6 8 10 11 2 14 16 4 12 9 17 5 3 18 15 19] arrayloops 6 eq test
[9 8 3 11 5 7 13 19 12 4 14 10 18 2 16 1 0 15 6 17] arrayloops 1 eq test
test.end