/src/tools/syntax/tree/liberty_ast_variant.e

 1-- This file is part of Liberty Eiffel.
 2--
 3-- Liberty Eiffel is free software: you can redistribute it and/or modify
 4-- it under the terms of the GNU General Public License as published by
 5-- the Free Software Foundation, version 3 of the License.
 6--
 7-- Liberty Eiffel is distributed in the hope that it will be useful,
 8-- but WITHOUT ANY WARRANTY; without even the implied warranty of
 9-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10-- GNU General Public License for more details.
11--
12-- You should have received a copy of the GNU General Public License
13-- along with Liberty Eiffel.  If not, see <http://www.gnu.org/licenses/>.
14--
15class LIBERTY_AST_VARIANT
16
17inherit
18   LIBERTY_AST_NON_TERMINAL_NODE
19
20create {LIBERTY_NODE_FACTORY}
21   make
22
23feature {LIBERTY_AST_HANDLER}
24   has_expression: BOOLEAN is
25      do
26         Result := count > 0
27      end
28
29   expression: LIBERTY_AST_EXPRESSION is
30      require
31         has_expression
32      do
33         Result ::= nodes.item(1)
34      end
35
36feature {ANY}
37   count: INTEGER is
38      do
39         Result := nodes.count
40      end
41
42   name: STRING is "Variant"
43
44feature {}
45   possible_counts: SET[INTEGER] is
46      once
47         Result := {AVL_SET[INTEGER] << 0, 2 >> }
48      end
49
50end