public Object eval(CallStack callstack, Interpreter interpreter) throws EvalError {
Class elementType = null;
SimpleNode expression;
SimpleNode statement = null;
NameSpace enclosingNameSpace = callstack.top();
SimpleNode firstNode = ((SimpleNode) jjtGetChild(0));
int nodeCount = jjtGetNumChildren();
if (firstNode instanceof BSHType) {
elementType = ((BSHType) firstNode).getType(callstack, interpreter);
expression = ((SimpleNode) jjtGetChild(1));
if (nodeCount > 2) {
statement = ((SimpleNode) jjtGetChild(2));
}
} else {
expression = firstNode;
if (nodeCount > 1) {
statement = ((SimpleNode) jjtGetChild(1));
}
}
BlockNameSpace eachNameSpace = new BlockNameSpace(enclosingNameSpace);
callstack.swap(eachNameSpace);
final Object iteratee = expression.eval(callstack, interpreter);
if (iteratee == Primitive.NULL) {
throw new EvalError(
"The collection, array, map, iterator, or "
+ "enumeration portion of a for statement cannot be null.",
this,
callstack);
}
CollectionManager cm = CollectionManager.getCollectionManager();
if (!cm.isBshIterable(iteratee)) {
throw new EvalError("Can't iterate over type: " + iteratee.getClass(), this, callstack);
}
BshIterator iterator = cm.getBshIterator(iteratee);
Object returnControl = Primitive.VOID;
while (iterator.hasNext()) {
try {
Object value = iterator.next();
if (value == null) {
value = Primitive.NULL;
}
if (elementType != null) {
eachNameSpace.setTypedVariable(
varName /*name*/, elementType /*type*/, value /*value*/, new Modifiers() /*none*/);
} else {
eachNameSpace.setVariable(varName, value, false);
}
} catch (UtilEvalError e) {
throw e.toEvalError("for loop iterator variable:" + varName, this, callstack);
}
boolean breakout = false; // switch eats a multi-level break here?
if (statement != null) {
// not empty statement
Object ret = statement.eval(callstack, interpreter);
if (ret instanceof ReturnControl) {
switch (((ReturnControl) ret).kind) {
case RETURN:
returnControl = ret;
breakout = true;
break;
case CONTINUE:
break;
case BREAK:
breakout = true;
break;
}
}
}
if (breakout) {
break;
}
}
callstack.swap(enclosingNameSpace);
return returnControl;
}