Class BSHEnhancedForStatement

src/bsh/BSHEnhancedForStatement.java:39–122

Implementation of the enhanced for(:) statement. This statement uses Iterator to support iteration over a wide variety of iterable types. @author Daniel Leuck @author Pat Niemeyer

	 @author Pat Niemeyer
*/
class BSHEnhancedForStatement extends SimpleNode implements ParserConstants 
{
	String varName;

    BSHEnhancedForStatement(int id) { super(id); }

    public Object eval( CallStack callstack , Interpreter interpreter )
		throws EvalError 
	{
		Class elementType = null;
		SimpleNode expression, 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 );
		Iterator 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) {