/**
* Visit a variable node. The value of the variable is obtained from the symbol table (symTab) and
* pushed onto the stack.
*/
public Object visit(ASTVarNode node, Object data) throws ParseException {
// try to get the variable object
Variable var = symTab.getVar(node.getVarName());
if (var == null) {
String message = "Could not evaluate " + node.getVarName() + ": ";
throw new ParseException(message + "the variable was not found in the symbol table");
}
// get the variable value
// Object temp = var.getValue();
Object temp = var.getValue();
if (trapNullValues && temp == null) {
String message = "Could not evaluate " + node.getVarName() + ": ";
throw new ParseException(message + "variable not set");
}
// all is fine
// push the value on the stack
stack.push(temp);
return data;
}
