%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/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

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

/toset { % array -> dict of (value, true)
    << exch
       {
           true
       } 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


% end included library code

/multiplybytwo {
    0 dict begin
    exch
    /p exch toset def
    {
        dup p exch known {
            2 mul
        } {
            exit
        } ifelse
    } loop
    end
} bind def

(multiplybytwo) test.start
[5 3 6 1 12] 3 multiplybytwo 24 eq test
[1 2 4 3] 1 multiplybytwo 8 eq test
[5 6 7] 2 multiplybytwo 2 eq test
test.end