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Java > Open Source Codes > Tifthenelse


1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
2  * Copyright (C) 2001 Gerwin Klein <lsf@jflex.de> *
3  * Copyright (C) 2001 Bernhard Rumpe <rumpe@in.tum.de> *
4  * All rights reserved. *
5  * *
6  * This program is free software; you can redistribute it and/or modify *
7  * it under the terms of the GNU General Public License. See the file *
8  * COPYRIGHT for more information. *
9  * *
10  * This program is distributed in the hope that it will be useful, *
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13  * GNU General Public License for more details. *
14  * *
15  * You should have received a copy of the GNU General Public License along *
16  * with this program; if not, write to the Free Software Foundation, Inc., *
17  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
18  * *
19  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
20
21
22 /**
23  * AST node for if-then-else expressions
24  */
25 class Tifthenelse extends Texp implements AST {
26   Tboolexp boolexp; // condition
27 Texp exp1, exp2; // then and else branch
28
29   public Tifthenelse(Tboolexp b, Texp e1, Texp e2) {
30     boolexp=b;
31     exp1=e1;
32     exp2=e2;
33   }
34   
35   public String JavaDoc toString() {
36     return "if "+boolexp+" then "+exp1+" else "+exp2+" fi";
37   }
38
39   public void checkcontext(SymTab st) {
40     boolexp.checkcontext(st);
41     exp1.checkcontext(st);
42     exp2.checkcontext(st);
43   }
44
45   public void prepInterp(SymTab st) {
46     boolexp.prepInterp(st);
47     exp1.prepInterp(st);
48     exp2.prepInterp(st);
49   }
50
51   public int interpret(int[] in, int[] par) {
52     boolean b = boolexp.interpret(in,par);
53     if (b)
54       return exp1.interpret(in,par);
55     else
56       return exp2.interpret(in,par);
57   }
58 }
59
60
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