%!PS

% begin included library code
% see https://github.com/Firedrake/postscript-libraries/
/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

/deepeq {
    2 dict begin
    /a exch def
    /b exch def
    a type b type eq {
        a type /dicttype eq {
            a length b length eq {
                <<
                    a {
                        pop
                        true
                    } forall
                    b {
                        pop
                        true
                    } forall
                >>
                true exch
                {
                    pop
                    dup a exch known {
                        dup b exch known {
                            dup a exch get exch b exch get deepeq not {
                                pop false
                            } if
                        } {
                            false
                        } ifelse
                    } {
                        false
                    } ifelse
                } forall
            } {
                false
            } ifelse
        } {
            a type dup /arraytype eq exch /stringtype eq or {
                a length b length eq {
                    true
                    0 1 a length 1 sub {
                        dup a exch get exch b exch get deepeq not {
                            pop false
                            exit
                        } if
                    } for
                } {
                    false
                } ifelse
            } {
                a b eq
            } ifelse
        } ifelse
    } {
        false
    } ifelse
    end
} 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

/cvss {
    dup log cvi 1 add string cvs
} bind def

% from https://www.rosettacode.org/wiki/Reverse_a_string#PostScript

/reverse {
    3 dict begin
    /str exch def
    /temp str 0 get def
    /i 0 def
    str length 2 idiv {
        /temp str i get def
        str i str str length i sub 1 sub get put
        str str length i sub 1 sub temp put
        /i i 1 add def
    } repeat
    str
    end
} bind def

/reversible {
    4 dict begin
    /mx exch def
    [
        1 1 mx {
            /n exch def
            /t n cvss reverse cvi n add def
            /q true def
            {
                t 0 le {
                    exit
                } if
                t 2 mod 0 eq {
                    /q false def
                    exit
                } if
                /t t 10 idiv def
            } loop
            q {
                n
            } if
        } for
    ]
    end
} bind def

(reversible) test.start
99 reversible [ 10 12 14 16 18 21 23 25 27 30 32 34 36 41 43 45 50 52
                54 61 63 70 72 81 90 ] deepeq test
test.end