/// <summary>
/// R1 is the region after the first non-vowel following a vowel, or is the null region at the end of the word if there is no such non-vowel.
/// </summary>
/// <returns></returns>
internal static WordRegion CalculateR(string word, int offset)
{
if (offset >= word.Length)
{
return(new WordRegion(word.Length, word.Length));
}
int firstVowel = word.IndexOfAny(Vowels, offset);
int firstNonVowel = IndexOfNone(word, Vowels, firstVowel);
int nextVowel = firstNonVowel + 1;
//int nextNonVowel = IndexOfNone(word, nextVowel, vowels);
WordRegion result = new WordRegion();
if (nextVowel > 0 &&
nextVowel < word.Length)
{
result.Start = nextVowel;
}
else
{
result.Start = word.Length;
}
result.End = word.Length;
return(result);
}
internal void GenerateStem()
{
if (IsException1())
{
return;
}
//If the word has two letters or less, leave it as it is.
if (Stem.Length < 3)
{
return;
}
//Remove initial ', if present. +
StandardiseApostrophesAndStripLeading();
//Set initial y, or y after a vowel, to Y
MarkYs();
//establish the regions R1 and R2. (See note on vowel marking.)
if (Stem.StartsWith("gener") ||
Stem.StartsWith("arsen"))
{
_r1 = CalculateR(Stem, 2);
}
else if (Stem.StartsWith("commun"))
{
_r1 = CalculateR(Stem, 3);
}
else
{
_r1 = CalculateR(Stem, 0);
}
_r2 = CalculateR(Stem, _r1.Start);
//Step0
StripTrailingApostrophe();
//Step1a
StripSuffixStep1a();
if (IsException2())
{
return;
}
//Step1b
StripSuffixStep1b();
//Step 1c: *
ReplaceSuffixStep1c();
//Step2
ReplaceEndingStep2();
//Step3
ReplaceEndingStep3();
//Step4
StripSuffixStep4();
//Step5
StripSuffixStep5();
//Finally, turn any remaining Y letters in the word back into lower case.
Finally();
}
