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date.e
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1999-06-05
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-- This file is part of SmallEiffel The GNU Eiffel Compiler.
-- Copyright (C) 1994-98 LORIA - UHP - CRIN - INRIA - FRANCE
-- Dominique COLNET and Suzanne COLLIN - colnet@loria.fr
-- http://SmallEiffel.loria.fr
-- SmallEiffel is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the Free
-- Software Foundation; either version 2, or (at your option) any later
-- version. SmallEiffel 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. See the GNU General Public License
-- for more details. You should have received a copy of the GNU General
-- Public License along with SmallEiffel; see the file COPYING. If not,
-- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-- Boston, MA 02111-1307, USA.
--
class DATE
inherit
ANY
redefine print_on
end;
creation {ANY}
make
feature {ANY}
print_on(file: OUTPUT_STREAM) is
do
file.put_string("day : ");
file.put_integer(day);
file.put_string(" minute : ");
file.put_integer(min);
end;
minutes_to(after: DATE): INTEGER is
-- Count of minutes to go to `after'.
require
after >= Current
do
Result := ((after.day - day) * 24 * 60 + (after.min - min));
ensure
Result >= 0;
end;
day_night_to(d2: DATE): ARRAY[INTEGER] is
-- Result @ Result.lower : Night time.
-- Result @ Result.upper : Day time.
require
d2 >= Current
local
min_jour, min_nuit: INTEGER;
save_day, save_min: INTEGER;
do
from
save_day := day;
save_min := min;
until
is_equal(d2)
loop
if day_time then
min_jour := min_jour + 1;
else
min_nuit := min_nuit + 1;
end;
add_time(1);
end;
day := save_day;
min := save_min;
Result := <<min_jour,min_nuit>>
ensure
Result.count = 2;
(Result @ 1) + (Result @ 2) = minutes_to(d2)
end;
infix ">=" (d2: like Current): BOOLEAN is
require
d2 /= Void
do
Result := (day > d2.day) or else
((day = d2.day) and then (min >= d2.min));
end
day_time: BOOLEAN is
-- Is it Sunny ?
do
Result := (min >= 6*60) and (min <= 22*60);
end;
nigth_time: BOOLEAN is
-- Is it the night ?
do
Result := not day_time;
end;
feature {ANY} -- Modifications :
make(vday, vmin: INTEGER) is
do
day := vday;
min := vmin;
ensure
day = vday;
min = vmin;
end;
add_time(nb_min: INTEGER) is
do
min := min + nb_min;
if min > (24*60) then
day := day + (min // (24*60));
min := min \\ (24*60);
end;
end;
feature {DATE}
day, min : INTEGER;
invariant
day >= 0;
min >= 0;
min < 24 * 60;
end -- DATE