if (value instanceof NumberExpression) {
NumberExpression number = (NumberExpression) value;
number.setExpliciteSign(true);
if (sign.getType() == LessLexer.MINUS) {
number.negate();
number.setOriginalString("-" + number.getOriginalString());
} else if (sign.getType() == LessLexer.PLUS) {
number.setOriginalString("+" + number.getOriginalString());
}