Expression second = null;
if (hasChildren(token.getChild(0))) {
first = termBuilder.buildFromChildTerm(token.getChild(0));
String sign = "";
if (first.getType() == ASTCssNodeType.SIGNED_EXPRESSION) {
SignedExpression negated = (SignedExpression) first;
first = negated.getExpression();
sign = negated.getSign().toSymbol();
}
if (first.getType() == ASTCssNodeType.IDENTIFIER_EXPRESSION) {
IdentifierExpression ident = (IdentifierExpression) first;
String lowerCaseValue = ident.getValue().toLowerCase();
lowerCaseValue = sign + lowerCaseValue;