examples/clock_more.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #     http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 # A beefed up example of the `clock` module that show class refinement.
  16 #
  17 # It refines clock to make them comparable.
  18 module clock_more
  19
  20 import clock
  21
  22 redef class Clock
  23         # Clock are now comparable
  24         super Comparable
  25
  26         # Comparaison of a clock make only sense with an other clock
  27         redef type OTHER: Clock
  28
  29         redef fun <(o)
  30         do
  31                 # Note: < is the only abstract method of Comparable.
  32                 #       All other operators and methods rely on < and ==.
  33                 return self.total_minutes < o.total_minutes
  34         end
  35 end
  36
  37 var c1 = new Clock(8, 12)
  38 var c2 = new Clock(8, 13)
  39 var c3 = new Clock(9, 13)
  40
  41 print "{c1}<{c2}? {c1<c2}"
  42 print "{c1}<={c2}? {c1<=c2}"
  43 print "{c1}>{c2}? {c1>c2}"
  44 print "{c1}>={c2}? {c1>=c2}"
  45 print "{c1}<=>{c2}? {c1<=>c2}"
  46 print "{c1},{c2}? max={c1.max(c2)} min={c1.min(c2)}"
  47 print "{c1}.is_between({c2}, {c3})? {c1.is_between(c2, c3)}"
  48 print "{c2}.is_between({c1}, {c3})? {c2.is_between(c1, c3)}"
  49
  50 print "-"
  51
  52 c1.minutes += 1
  53
  54 print "{c1}<{c2}? {c1<c2}"
  55 print "{c1}<={c2}? {c1<=c2}"
  56 print "{c1}>{c2}? {c1>c2}"
  57 print "{c1}>={c2}? {c1>=c2}"
  58 print "{c1}<=>{c2}? {c1<=>c2}"
  59 print "{c1},{c2}? max={c1.max(c2)} min={c1.min(c2)}"
  60 print "{c1}.is_between({c2}, {c3})? {c1.is_between(c2, c3)}"
  61 print "{c2}.is_between({c1}, {c3})? {c2.is_between(c1, c3)}"