Aminet 30/Aminet 30 (1999)(Schatztruhe)[!][Apr 1999].iso/Aminet/dev/lang/SmallEiffel.lha/SmallEiffel/lib_std/fixed_array2.e

Text File | 1998-12-22 | 8KB | 355 lines

-- This file is  free  software, which  comes  along  with  SmallEiffel. This
-- software  is  distributed  in the hope that it will be useful, but WITHOUT
-- ANY  WARRANTY;  without  even  the  implied warranty of MERCHANTABILITY or
-- FITNESS  FOR A PARTICULAR PURPOSE. You can modify it as you want, provided
-- this header is kept unaltered, and a notification of the changes is added.
-- You  are  allowed  to  redistribute  it and sell it, alone or as a part of
-- another product.
--          Copyright (C) 1994-98 LORIA - UHP - CRIN - INRIA - FRANCE
--            Dominique COLNET and Suzanne COLLIN - [e-mail]
--                       http://www.loria.fr/SmallEiffel
--
class FIXED_ARRAY2[E]
   --
   -- Resizable two dimensional array.
   -- Unlike ARRAY2, the `lower1' bound and the `lower2' bound are
   -- frozen to 0. Thus, one can expect better performances.
   --

inherit COLLECTION2[E];

creation
   make, copy, from_collection2, from_collection, from_model

feature

   upper1, count1, upper2, count2, count: INTEGER;

feature {FIXED_ARRAY2}

   storage: NATIVE_ARRAY[E];

   capacity : INTEGER; -- of `storage'.

feature

   lower1: INTEGER is 0;

   lower2: INTEGER is 0;

feature

   make(new_count1 , new_count2 : INTEGER) is
     -- Create or reset Current with new dimensions.
     -- All elements are set to the default value of type E.
      require
     new_count1 > 0;
     new_count2 > 0
      do
     count1 := new_count1;
     upper1 := new_count1 - 1;
     count2 := new_count2;
     upper2 := new_count2 - 1;
     count := count1 * count2;
     if capacity < count then
        capacity := count;
        storage := storage.calloc(capacity);
     else
        storage.clear_all(capacity - 1);
     end;
      ensure
     count1 = new_count1;
     count2 = new_count2;
     all_cleared
      end;

   from_collection(model: COLLECTION2[like item]) is
     -- Uses the `model' to update Current.
      local
     i, j: INTEGER;
      do
     make(model.upper1+1, model.upper2+1);
     from
        i := 0;
     until
        i > upper1
     loop
        from
           j := 0;
        until
           j > upper2
        loop
           put(model.item(i,j),i,j);
           j := j + 1;
        end
        i := i + 1;
     end
      end;

feature -- Implementation of others feature from COLLECTION2 :

   item(line, column: INTEGER): E is
      do
     Result := storage.item(line * count2 + column);
      end;

   put(x: like item; line, column: INTEGER) is
      require
     valid_index(line,column)
      do
     storage.put(x,line * count2 + column);
      end;

   force(element: like item; line , column : INTEGER) is
      do
     if not valid_index(line, column) then
        resize(line.max(upper1),column.max(upper2));
     end;
         put(element,line,column);
      end;

   copy(other: like Current) is
      do
     count1 := other.count1;
     upper1 := count1 - 1;
     count2 := other.count2;
     upper2 := count2 - 1;
     count := count1 * count2;
     if capacity < count then
        capacity := count;
        storage := storage.calloc(capacity);
     end;
     storage.copy_from(other.storage, count - 1);
      end;

   is_equal(other: like Current): BOOLEAN is
      do
     if other = Current then
        Result := true;
     elseif upper1 /= other.upper1 then
     elseif upper2 /= other.upper2 then
     else
        Result := storage.memcmp(other.storage,count);
     end;
      end;

feature -- Writing :

   set_all_with(x: E) is
     --  All element are set with the value x.
      do
     storage.set_all_with(x,count - 1)
      ensure
         count = old count
      end; -- set_all_with

   all_cleared : BOOLEAN is
      do
     result := storage.all_cleared(count - 1);
      end;

   slice(l1,up1,l2,up2: INTEGER): like Current is
     -- Create a new collection initialized with elements of
     -- range `low'..`up'. Result has the same dynamic type
     -- as Current collection.
      local
     ligne,colonne : INTEGER;
     k : INTEGER;
      do
     from
        !!Result.make((up1 - l1) + 1,(up2 - l2) + 1);
        ligne := l1;
     until
        ligne > up1
     loop
        from
           colonne := l2;
        until
           colonne > up2
        loop
           Result.put(item(ligne,colonne),ligne - l1,colonne - l2);
           colonne := colonne + 1;
        end;
        ligne := ligne + 1;
     end;
      end; -- slice

   set_slice(element: like item;  l1,up1,l2,up2: INTEGER) is
    -- Set all the elements in the
    -- range [(l1,up1),(l2,up2)] of
    -- Current with the element 'element'.

      local
     i,j : INTEGER;
      do
     from
        i := l1 * count2;
         until
            i > up1 * count2
         loop
            from
               j := l2;
            until
               j > up2
            loop
               storage.put(element,i + j);
               j := j + 1;
            end;
            i := i + count2;
         end;
      end;

   swap(line1, column1, line2, column2 : INTEGER) is
      local
     tmp: like item;
     c2, index1, index2 : INTEGER
      do
     c2 := count2;
     index1 := line1 * c2 + column1;
     index2 := line2 * c2 + column2;
     tmp := storage.item( index1);
     storage.put(storage.item(index2) ,index1);
     storage.put(tmp,index2);
      end

feature -- Looking and comparison :

   nb_occurrences(elt: E): INTEGER is
     -- Number of occurrences using `equal'.
     -- See also `fast_nb_occurrences' to chose
     -- the apropriate one.
      do
         Result := storage.nb_occurrences(elt,count - 1);
      ensure
     Result >= 0;
      end; -- nb_occurences

   fast_nb_occurrences(elt: E): INTEGER is
     -- Number of occurrences using `='.
      do
     Result := storage.fast_nb_occurrences(elt,count - 1);
      ensure
     Result >= 0;
      end; -- fast_nb_occurrences

feature -- Resizing :

   resize(new_count1 , new_count2: INTEGER) is
      require
     new_count1 > 0;
     new_count2 > 0
      local
     tmp: like Current;
     l, c: INTEGER;
      do
     !!tmp.make(new_count1, new_count2);
     -- It may be possible to avoid this ceation when :
     --    new `capacity' <= old `capacity'
     from
        l := line_maximum;
     until
        l < 0
     loop
        from
           c := column_maximum;
        until
           c < 0
        loop
           if tmp.valid_index(l,c) then
          tmp.put(item(l,c),l,c);
           end;
           c := c - 1;
        end;
        l := l - 1;
     end;
     standard_copy(tmp);
      ensure
     upper1 = new_count1 - 1;
     count1 = new_count1;
     upper2 = new_count2 - 1;
     count2 = new_count2;
     count = new_count1 * new_count2
      end;

feature -- Looking and Searching :

   has(x: like item): BOOLEAN is
     -- Look for `x' using `equal' for comparison.
      do
     Result := storage.index_of(x,count-1) <= (count-1);
      end;  -- has

   fast_has(x: like item): BOOLEAN is
     -- Same as `has' but use `=' for comparison
      do
     Result := storage.fast_index_of(x,count - 1) <= (count - 1);
      end; -- fast_has

feature -- Other features :

   replace_all(old_value, new_value: like item) is
      do
     storage.replace_all(old_value,new_value,count - 1);
      end;

   fast_replace_all(old_value, new_value: like item) is
      do
     storage.fast_replace_all(old_value,new_value,count - 1);
      end;

   transpose is
     -- Transpose the Current array
      local
     i,j : INTEGER;
     oldu1 , oldu2 : INTEGER;
      do
     oldu1 := upper1;
     oldu2 := upper2;
     resize(upper2.max(upper1),upper2.max(upper1));
     from
        i := 0;
     until
        i > upper1 - 1
     loop
        from
           j := i + 1;
        until
           j > upper2
        loop
           swap(i,j,j,i);
           j := j + 1;
        end;
        i := i + 1;
     end;
     resize(oldu2,oldu1);
      end;  -- transpose

feature {COLLECTION2}

   same_as(other: COLLECTION2[E]): BOOLEAN is
      do
     Result := other.same_as_fixed_array2(Current);
      end;

   same_as_array2(other: ARRAY2[E]): BOOLEAN is
      do
     Result := standard_same_as(other);
      end;

   same_as_fixed_array2(other: FIXED_ARRAY2[E]): BOOLEAN is
      do
     Result := standard_same_as(other);
      end;

invariant

   count1 = upper1 + 1;

   count2 = upper2 + 1;

   count = count1 * count2;

   capacity >= count;

end -- FIXED_ARRAY2[E]