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 # This module beef up the clock module by allowing a clock to be comparable.
  16 # It show the usage of class refinement
  17 module clock_more
  18
  19 import clock
  20
  21 redef class Clock
  22         # Clock are now comparable
  23         super Comparable
  24
  25         # Comparaison of a clock make only sense with an other clock
  26         redef type OTHER: Clock
  27
  28         redef fun <(o)
  29         do
  30                 # Note: < is the only abstract method of Comparable.
  31                 #       All other operators and methods rely on < and ==.
  32                 return self.total_minutes < o.total_minutes
  33         end
  34 end
  35
  36 var c1 = new Clock(8, 12)
  37 var c2 = new Clock(8, 13)
  38 var c3 = new Clock(9, 13)
  39
  40 print "{c1}<{c2}? {c1<c2}"
  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}? max={c1.max(c2)} min={c1.min(c2)}"
  46 print "{c1}.is_between({c2}, {c3})? {c1.is_between(c2, c3)}"
  47 print "{c2}.is_between({c1}, {c3})? {c2.is_between(c1, c3)}"
  48
  49 print "-"
  50
  51 c1.minutes += 1
  52
  53 print "{c1}<{c2}? {c1<c2}"
  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}? max={c1.max(c2)} min={c1.min(c2)}"
  59 print "{c1}.is_between({c2}, {c3})? {c1.is_between(c2, c3)}"
  60 print "{c2}.is_between({c1}, {c3})? {c2.is_between(c1, c3)}"