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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 an identifier
*/
class Tident extends Texp implements AST {
String name;
public Tident(String s) {
name = s;
}
public String toString() {
return name;
}
public void checkcontext(SymTab st) { // CoCo (DefVar)
SymtabEntry ste = st.lookup(name);
if (ste==null)
Main.error("variable not defined: "+name);
else if (ste.kind() != SymtabEntry.VAR)
Main.error("function used as variable: "+name);
}
int index; // number of ident in environment
boolean is_input; // is it an input variable?
public void prepInterp(SymTab st) { // set index for environment
STEvar ste = (STEvar)st.lookup(name);
index = ste.getIndex();
is_input = ste.isInput();
}
public int interpret(int[] in, int[] par) {
if (is_input)
return(in[index]);
else
return(par[index]);
}
}
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