if (hasLeftParenthesis || hasRightParenthesis) {
singleInputParameter = Boolean.FALSE;
}
else {
WordParser wordParser = new WordParser(getInItems().toActualText());
String word = wordParser.word();
wordParser.moveForward(word);
singleInputParameter = (word.length() > 0) &&
ExpressionTools.isParameter(word.charAt(0)) &&
wordParser.isTail();