tests/base_isa_cast_self.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2009 Jean Privat <jean@pryen.org>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 import kernel
  18
  19 class A
  20         init do end
  21
  22         meth work
  23         do
  24                 if self isa B then
  25                         foo
  26                         if self isa C then
  27                                 bar
  28                         end
  29 #alt1#                  bar
  30                         foo
  31                 else
  32 #alt2#                  foo
  33                 end
  34 #alt3#          foo
  35
  36                 if self isa B and self == self then
  37                         foo
  38                 end
  39
  40                 if self isa B or self == self then
  41 #alt4#                  foo
  42                 end
  43
  44                 assert self isa B
  45                 foo
  46         end
  47 end
  48
  49 class B
  50 special A
  51         meth foo do 0.output
  52         init do end
  53 end
  54
  55 class C
  56 special B
  57         meth bar do 1.output
  58         init do end
  59 end
  60
  61 var a: A
  62 a = new C
  63 #alt5#a = new B
  64 #alt6#a = new A
  65 a.work