Lucene.Net.Analysis.BR.BrazilianStemmer.getRV C# (CSharp) Method

        private string getRV(string value)
        {
            int i;
            int j;

            // be-safe !!!
            if (value == null)
            {
                return null;
            }

            i = value.Length - 1;

            // RV - IF the second letter is a consoant, RV is the region after
            //      the next following vowel,
            if ((i > 0) && !isVowel(value[1]))
            {
                // find 1st vowel
                for (j = 2; j < i; j++)
                {
                    if (isVowel(value[j]))
                    {
                        break;
                    }
                }

                if (j < i)
                {
                    return value.Substring(j + 1);
                }
            }


            // RV - OR if the first two letters are vowels, RV is the region
            //      after the next consoant,
            if ((i > 1) &&
                isVowel(value[0]) &&
                isVowel(value[1]))
            {
                // find 1st consoant
                for (j = 2; j < i; j++)
                {
                    if (!isVowel(value[j]))
                    {
                        break;
                    }
                }

                if (j < i)
                {
                    return value.Substring(j + 1);
                }
            }

            // RV - AND otherwise (consoant-vowel case) RV is the region after
            //      the third letter.
            if (i > 2)
            {
                return value.Substring(3);
            }

            return null;
        }