List<HiddenTokenAwareTree> children = actual.getChildren();
String name = buildFunctionName(children.get(0));
if (children.size() == 1) {
/* No arguments to the function */
return new FunctionExpression(token, name, new EmptyExpression(token));
}
HiddenTokenAwareTree parameterNode = children.get(1);
Expression parameter = (Expression) parentBuilder.switchOn(parameterNode);