Method eval

src/bsh/BSHUnaryExpression.java:36–55

( CallStack callstack, Interpreter interpreter)

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

    public Object eval( CallStack callstack, Interpreter interpreter)  
		throws EvalError
    {
        SimpleNode node = (SimpleNode)jjtGetChild(0);

		// If this is a unary increment of decrement (either pre or postfix)
		// then we need an LHS to which to assign the result.  Otherwise
		// just do the unary operation for the value.
		try {
			if ( kind == INCR || kind == DECR ) {
				LHS lhs = ((BSHPrimaryExpression)node).toLHS( 
					callstack, interpreter );
				return lhsUnaryOperation( lhs, interpreter.getStrictJava() );
			} else
				return 
					unaryOperation( node.eval(callstack, interpreter), kind );
		} catch ( UtilEvalError e ) {
			throw e.toEvalError( this, callstack );
		}
    }

    private Object lhsUnaryOperation( LHS lhs, boolean strictJava ) 
		throws UtilEvalError