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package bsh;
class BSHUnaryExpression extends SimpleNode implements ParserConstants {
public int kind;
public boolean postfix = false;
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 {
if (Interpreter.DEBUG)
Interpreter.debug("lhsUnaryOperation");
Object prevalue, postvalue;
prevalue = lhs.getValue();
postvalue = unaryOperation(prevalue, kind);
Object retVal;
if (postfix)
retVal = prevalue;
else
retVal = postvalue;
lhs.assign(postvalue, strictJava);
return retVal;
}
private Object unaryOperation(Object op, int kind) throws UtilEvalError {
if (op instanceof Boolean || op instanceof Character || op instanceof Number)
return primitiveWrapperUnaryOperation(op, kind);
if (!(op instanceof Primitive))
throw new UtilEvalError("Unary operation " + tokenImage[kind] + " inappropriate for object");
return Primitive.unaryOperation((Primitive) op, kind);
}
private Object primitiveWrapperUnaryOperation(Object val, int kind) throws UtilEvalError {
Class operandType = val.getClass();
Object operand = Primitive.promoteToInteger(val);
if (operand instanceof Boolean)
return new Boolean(Primitive.booleanUnaryOperation((Boolean) operand, kind));
else if (operand instanceof Integer) {
int result = Primitive.intUnaryOperation((Integer) operand, kind);
// ++ and -- must be cast back the original type
if (kind == INCR || kind == DECR) {
if (operandType == Byte.TYPE)
return new Byte((byte) result);
if (operandType == Short.TYPE)
return new Short((short) result);
if (operandType == Character.TYPE)
return new Character((char) result);
}
return new Integer(result);
} else if (operand instanceof Long)
return new Long(Primitive.longUnaryOperation((Long) operand, kind));
else if (operand instanceof Float)
return new Float(Primitive.floatUnaryOperation((Float) operand, kind));
else if (operand instanceof Double)
return new Double(Primitive.doubleUnaryOperation((Double) operand, kind));
else
throw new InterpreterError("An error occurred. Please call technical support.");
}
}
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