tests/base_var_null.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         var _foo: Int = 1
  21         fun +(i: Int): A do return new A
  22         redef fun output do 1.output
  23 end
  24
  25 fun unknown: nullable A do return new A
  26
  27 var a = null
  28 #alt1#a.output
  29 #alt2#a._foo.output
  30 #alt3#a._foo = 5
  31 #alt4#a += 5
  32
  33 var b: nullable A
  34 b = null
  35 #alt5#b.output
  36 #alt6#b._foo.output
  37 #alt7#b._foo = 5
  38 #alt8#b += 5
  39
  40 var c = unknown
  41 if c == null then
  42 #alt9#  c.output
  43 #alt10# c._foo.output
  44 #alt11# c._foo = 5
  45 #alt12# c += 5
  46 else
  47         c.output
  48         c._foo.output
  49         c._foo = 5
  50         c += 5
  51 end