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Sigma knowledge engineering system is an system for developing, viewing and debugging theories in first order logic. It works with Knowledge Interchange Format (KIF) and is optimized for the Suggested Upper Merged Ontology (SUMO) www.ontologyportal.org.

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package com.articulate.sigma.nlg;

import java.util.List;

/**
 * String utilities related to NLG.
 */
public class NLGStringUtils {

    /******************************************************************
     * Assemble the input list together into a single string with "and" separating the penultimate and the last
     * item, and commas separating the other items.
     * @param input
     * @return
     */
    static String concatenateWithCommas(List input) {
        if (input == null || input.isEmpty())   {
            return "";
        }

        StringBuilder sBuilder = new StringBuilder();
        for (int ct = 0; ct < input.size(); ct++)    {
            if (ct == input.size() - 1)  {
                // Last item in list.
                sBuilder.append(input.get(ct));
            }
            else if (ct == input.size() - 2)  {
                // Last item in list.
                sBuilder.append(input.get(ct)).append(" and ");
            }
            else {
                sBuilder.append(input.get(ct)).append(", ");
            }
        }

        return sBuilder.toString();
    }

    /*****************************************************************
     * Stolen from WordNetUtilities and put here so that some unit tests can work without WordNet loaded.
     * @param c
     * @return
     */
    static boolean isVowel(char c) {

        if (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u')
            return true;
        else
            return false;
    }

    /**************************************************************************************************************
     * Is input string a variable (i.e., does it start with a question mark)?
     * @param str
     * @return
     */
    public static boolean isVariable(String str) {
        if(str.substring(0, 1).equals("?")) {
            return true;
        }
        return false;
    }
}