%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/s2a {
    [ exch { } forall ]
} bind def

/a2s {
    2 dict begin
    /i exch def
    i length dup string /o exch def
    1 sub 0 exch 1 exch {
        dup i 3 -1 roll get o 3 1 roll put
    } for
    o
    end
} bind def

/filter { % array proc(bool) -> array
    1 dict begin
    /p exch def
    [ exch
      {
          dup p not
          {
              pop
          } if
      } forall
    ]
    end
} bind def

/test.start {
    print (:) print
    /test.pass 0 def
    /test.count 0 def
} 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 {
    /test.count test.count 1 add def
    {
        /test.pass test.pass 1 add def
    } {
        ( ) print
        test.count (....) cvs print
        (-fail) print
    } ifelse
} bind def

/toupper {
    s2a
    [ exch
      {
          dup dup 97 ge exch 122 le and {
              32 sub
          } if
      } forall
    ] a2s
} bind def

/tolower {
    s2a
    [ exch
      {
          dup dup 65 ge exch 90 le and {
              32 add
          } if
      } forall
    ] a2s
} bind def


% end included library code

/is_vowel {
    << 65 true
       69 true
       73 true
       79 true
       85 true
       97 true
       101 true
       105 true
       111 true
       117 true >>
    exch known
} bind def

/reversevowels {
    0 dict begin
    /p exch s2a def
    /q p { is_vowel } filter def
    /qi q length def
    [
        p {
            /c exch def
            c is_vowel {
                /qi qi 1 sub def
                /nc q qi get def
                c 65 ge c 90 le and {
                    1 string dup 0 nc put toupper 0 get /nc exch def
                } {
                    c 97 ge c 122 le and {
                        1 string dup 0 nc put tolower 0 get /nc exch def
                    } if
                } ifelse
                nc
            } {
                c
            } ifelse
        } forall
    ] a2s
    end
} bind def

(reversevowels) test.start
(Raku) reversevowels (Ruka) eq test
(Perl) reversevowels (Perl) eq test
(Julia) reversevowels (Jaliu) eq test
(Uiua) reversevowels (Auiu) eq test
test.end