-- 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 - colnet@loria.fr -- http://SmallEiffel.loria.fr -- class ARRAY[E] -- -- General purpose resizable ARRAYs. -- inherit ARRAYED_COLLECTION[E]; creation make, with_capacity, from_collection feature lower: INTEGER; -- Lower index bound. feature -- Creation and Modification : make(minindex, maxindex: INTEGER) is -- Make array with range [`minindex' .. `maxindex']. -- When `maxindex' = `minindex' - 1, the array is empty. require minindex -1 <= maxindex local needed: INTEGER; do lower := minindex; upper := maxindex; needed := maxindex - minindex + 1; if needed > 0 then if capacity < needed then storage := storage.calloc(needed); capacity := needed; else clear_all; end; end; ensure lower = minindex; upper = maxindex; all_cleared end; with_capacity(needed_capacity, low: INTEGER) is -- Create an empty array with `capacity' initialized -- at least to `needed_capacity' and `lower' set to `low'. require needed_capacity >= 0 do if capacity < needed_capacity then storage := storage.calloc(needed_capacity); capacity := needed_capacity; end; lower := low; upper := low - 1; ensure empty; needed_capacity <= capacity; lower = low end; feature -- Modification : resize(minindex, maxindex: INTEGER) is -- Resize the array. No elements will be lost in the -- intersection of [old `lower' .. old `upper'] and -- [`minindex' .. `maxindex']. -- New positions are initialized with appropriate -- default values. require minindex -1 <= maxindex local needed, offset, intersize: INTEGER; do needed := maxindex - minindex + 1; if needed > 0 then if needed > capacity then if capacity = 0 then storage := storage.calloc(needed); capacity := needed; else storage := storage.realloc(capacity, needed); capacity := needed; end; end; offset := lower - minindex; intersize := maxindex.min(upper) - minindex.max(lower) + 1; if intersize > 0 then if offset = 0 then if intersize < needed then storage.clear(intersize, needed - 1); end; elseif offset < 0 then storage.move(-offset, intersize - offset - 1, offset); if intersize < needed then storage.clear(intersize, needed - 1); end; else storage.move(0, intersize - 1, offset); storage.clear(0, offset - 1); if intersize + offset < needed then storage.clear(intersize + offset, needed - 1); end; end; else storage.clear(0, needed - 1); end; end; lower := minindex; upper := maxindex; end; feature sub_array(low, up: INTEGER): like Current is local i: INTEGER; do from !!Result.with_capacity(up - low + 1,low); Result.set_upper(up); i := low; until i > up loop Result.put(item(i),i); i := i + 1; end; ensure then Result.lower = low; end; feature -- Implementation of deferred : count: INTEGER is do Result := upper - lower + 1; end; item, infix "@" (index: INTEGER): E is do Result := storage.item(index - lower); end; put(element: like item; index: INTEGER) is do storage.put(element,index - lower); end; force(element: like item; index: INTEGER) is -- Put `element' at position `index'. Current is -- resized if `index' is not inside current bounds. -- New bounds are initialized with default values. require else true do if upper < index then resize(lower,index); elseif index < lower then resize(index,upper); end; put(element,index); end; copy(other: like Current) is local needed_capacity: INTEGER; do lower := other.lower; upper := other.upper; needed_capacity := upper - lower + 1; if capacity < needed_capacity then capacity := needed_capacity; storage := storage.calloc(capacity); end; if needed_capacity > 0 then storage.copy_from(other.storage,needed_capacity - 1); end; end; set_all_with(v: like item) is do storage.set_all_with(v,upper - lower); end; remove_first is do storage.remove_first(upper - lower); lower := lower + 1; ensure then upper = old upper; end; remove(index: INTEGER) is do storage.remove(index - lower,upper - lower); upper := upper - 1; end; clear is do upper := lower - 1; ensure then capacity = old capacity end; add_first(element: like item) is do if upper < lower then add_last(element); else add_last(element); move(lower,upper - 1,1); put(element,lower); end; end; add_last(element: like item) is local new_capacity: INTEGER; do if capacity < count + 1 then if capacity = 0 then capacity := 16; storage := storage.calloc(capacity); else new_capacity := 2 * capacity; storage := storage.realloc(capacity,new_capacity); capacity := new_capacity; end; end; upper := upper + 1; put(element,upper); end; from_collection(model: COLLECTION[like item]) is local i, up: INTEGER; do from with_capacity(model.count,model.lower); i := model.lower; up := model.upper; upper := up; until i > up loop put(model.item(i),i); i := i + 1; end; ensure then lower = model.lower; upper = model.upper end; all_cleared: BOOLEAN is do Result := storage.all_cleared(upper - lower); end; nb_occurrences(element: like item): INTEGER is do Result := storage.nb_occurrences(element,upper - lower); end; fast_nb_occurrences(element: like item): INTEGER is do Result := storage.fast_nb_occurrences(element,upper - lower); end; index_of(element: like item): INTEGER is do Result := lower + storage.index_of(element,upper - lower); end; fast_index_of(element: like item): INTEGER is do Result := lower + storage.fast_index_of(element,upper - lower); end; is_equal(other: like Current): BOOLEAN is do if Current = other then Result := true; elseif lower = other.lower and then upper = other.upper then Result := storage.memcmp(other.storage,count); end; end; slice(low, up: INTEGER): like Current is local i: INTEGER; do from i := low; !!Result.with_capacity(up - low + 1,lower); until i > up loop Result.add_last(item(i)); i := i + 1; end; end; end -- ARRAY[E]