%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/listmin {
    { min } reduce
} bind def

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

/s2a {
    [ exch { } forall ]
} bind def

/map { % array proc -> array
    2 dict begin
    /p exch def
    [ exch
      {
          p
      } forall
    ]
    end
} 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

/reduce { % array proc -> value
    2 dict begin
    /p exch def
    /a exch def
    a 0 get
    1 1 a length 1 sub {
        a exch get
        p
    } for
    end
} bind def


/keys { % dict -> array of dict keys
    [ exch
      {
          pop
      } forall
    ]
} 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

/equalstrings {
    0 dict begin
    /a exch def
    a toset keys { dup length string cvs s2a } map /ca exch def
    /mmlen ca { length } map listmin def
    /si 0 def
    0
    0 1 mmlen 1 sub {
        /i exch def
        /si i def
        1 1 ca length 1 sub {
            /s exch def
            ca 0 get i get ca s get i get ne {
                i 0 eq {
                    pop -1
                    exit
                } if
                /si si 1 sub def
                exit
            } if
        } for
    } for
    -1 eq {
        -1
    } {
        a { length } map { add } reduce a length si 1 add mul sub
    } ifelse
    end
} bind def

(equalstrings) test.start
[(abc) (abb) (ab)] equalstrings 2 eq test
[(ayz) (cyz) (xyz)] equalstrings -1 eq test
[(yza) (yzb) (yzc)] equalstrings 3 eq test
test.end