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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 infix expressions
*/
class Texpinfix extends Texp implements AST {
Texp exp1, exp2; // left and right sub expression
char kind; // kind ('+', '-', '*', '/')
public Texpinfix(Texp e1, char k, Texp e2) {
exp1=e1;
kind=k;
exp2=e2;
}
public String toString() {
return("("+exp1+kind+exp2+")");
}
public void checkcontext(SymTab st) { // context conditions
exp1.checkcontext(st);
exp2.checkcontext(st);
}
public void prepInterp(SymTab st) { // set pointers und indices
exp1.prepInterp(st);
exp2.prepInterp(st);
}
public int interpret(int[] in, int[] par) {
int e1 = exp1.interpret(in,par);
int e2 = exp2.interpret(in,par);
switch (kind) {
case '+': return(e1+e2);
case '-': return(e1-e2);
case '*': return(e1*e2);
case '/': return(e1/e2);
}
return -1; // error
}
}
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