Sort using a custom comparator

Sort using a custom comparator
You are encouraged to solve this task according to the task description, using any language you may know.

Sort an array (or list) of strings in order of descending length, then in ascending lexicographic order. Use a sorting facility provided by the language/library, combined with your own callback comparison function.

Ada

Compiler:GNAT GPL 2006

Comparator_Package.ads

package Comparator_Package is
   procedure Move_String(From : Natural; To : Natural);
   function Lt (Left, Right : Natural) return Boolean;
   function Gt (Left, Right : Natural) return Boolean;
   procedure Print_Array;
end Comparator_Package;

Comparator_Package.adb

with Ada.Strings.Unbounded; use Ada.Strings.Unbounded;
with Ada.Text_Io; use Ada.Text_Io;

package body Comparator_Package is
   type Data is array(Natural range <>) of Unbounded_String;
  
   Strings : Data := (Null_Unbounded_String,
      To_Unbounded_String("this"),
      To_Unbounded_String("is"),
      To_Unbounded_String("a"),
      To_Unbounded_String("set"),
      To_Unbounded_String("of"),
      To_Unbounded_String("strings"),
      To_Unbounded_String("to"),
      To_Unbounded_String("sort"));
     
   procedure Move_String(From : Natural; To : Natural) is
   begin
      Strings(To) := Strings(From);
   end Move_String;
  
   function Lt (Left, Right : Natural) return Boolean is
   begin
      return Strings(Left) < Strings(Right);
   end Lt;
  
   function Gt (Left, Right : Natural) return Boolean is
   begin
      return Strings(Left) > Strings(Right);
   end Gt;
  
   procedure Print_Array is
   begin
      for I in 1..Strings'Last loop
         Put_Line(To_String(Strings(I)));
      end loop;
   end Print_Array;
end Comparator_Package;

Custom_Comparator.adb

with Gnat.Heap_Sort_A; use Gnat.Heap_Sort_A;
with Ada.Text_Io; use Ada.Text_Io;
with Comparator_Package; use Comparator_Package;

procedure Custom_Comparator is
begin
   Put_Line("  Unsorted Array:");
   Print_Array;
   New_Line;
   Put_Line("  Sorted in descending order:");
   Sort(8, Move_String'access, Lt'access);
   Print_Array;
   New_Line;
   Put_Line("  Sorted in Ascending order:");
   Sort(8, Move_String'access, Gt'access);
   Print_Array;
end Custom_Comparator;

Output File

  Unsorted Array:
this
is
a
set
of
strings
to
sort

  Sorted in descending order:
a
is
of
set
sort
strings
this
to

  Sorted in Ascending order:
to
this
strings
sort
set
of
is
a

C

Compiler: GCC 4.0.1

Platform: BSD

#include <stdlib.h>
#include <strings.h>

int mycmp(const void *s1, const void *s2)
{
    int d;
    const char *l = *(const char **)s1, *r = *(const char **)s2;
    if (d = strlen(r) - strlen(l))
        return d;
    return strcasecmp(l, r);
}

int main()
{
    char *strings[8] = {"Here", "are", "some", "sample", "strings", "to", "be", "sorted"};
    qsort(strings, 8, sizeof(char *), mycmp);
}

Haskell

Interpreter: GHCi

import List
import Char

mycmp s1 s2 = case compare (length s2) (length s1) of
                 EQ -> compare (map toLower s1) (map toLower s2)
                 x  -> x

strings = ["Here", "are", "some", "sample", "strings", "to", "be", "sorted"]
sorted = sortBy mycmp strings

Perl

Interpreter: perl 5.8.6

sub mycmp { length $b <=> length $a or lc $a cmp lc $b }

@strings = ("Here", "are", "some", "sample", "strings", "to", "be", "sorted");
@sorted = sort mycmp @strings;

PHP

Interpreter: PHP 4.4.4 CLI

<?php
function mycmp($s1, $s2)
{
    if ($d = strlen($s2) - strlen($s1))
        return $d;
    return strcasecmp($s1, $s2);
}

$strings = array("Here", "are", "some", "sample", "strings", "to", "be", "sorted");
usort($strings, "mycmp");
?>

Python

Interpreter: 2.5

def mycmp(s1, s2):
    d = len(s2) - len(s1)
    return d if d else cmp(s1, s2)

strings = ["Here", "are", "some", "sample", "strings", "to", "be", "sorted"]
print sorted(strings, cmp=mycmp)

# Alternative with decoration, unfit for very long lists:
print sorted(strings, key=lambda s: (-len(s), s))