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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright (C) 2001 Gerwin Klein <lsf@jflex.de> *
* Copyright (C) 2001 Bernhard Rumpe <rumpe@in.tum.de> *
* All rights reserved. *
* *
* License: BSD *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/**
* AST node for if-then-else expressions
*/
class Tifthenelse extends Texp implements AST {
Tboolexp boolexp; // condition
Texp exp1, exp2; // then and else branch
public Tifthenelse(Tboolexp b, Texp e1, Texp e2) {
boolexp=b;
exp1=e1;
exp2=e2;
}
public String toString() {
return "if "+boolexp+" then "+exp1+" else "+exp2+" fi";
}
public void checkcontext(SymTab st) {
boolexp.checkcontext(st);
exp1.checkcontext(st);
exp2.checkcontext(st);
}
public void prepInterp(SymTab st) {
boolexp.prepInterp(st);
exp1.prepInterp(st);
exp2.prepInterp(st);
}
public int interpret(int[] in, int[] par) {
boolean b = boolexp.interpret(in,par);
if (b)
return exp1.interpret(in,par);
else
return exp2.interpret(in,par);
}
}
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