/* turns terminal y to i when there is another vowel in the stem. */
public void PerformStep2(TokenSource source)
{
if (source.EndsWith('y') &&
source.ContainsVowel(source.Size - 2)
)
{
source.Buffer[source.Size - 1] = 'i';
}
}
/* gets rid of plurals and -ed or -ing. e.g.
* caresses -> caress
* ponies -> poni
* ties -> ti
* caress -> caress
* cats -> cat
*
* feed -> feed
* agreed -> agree
* disabled -> disable
*
* matting -> mat
* mating -> mate
* meeting -> meet
* milling -> mill
* messing -> mess
*
* meetings -> meet
*
*/
public void PerformStep1(TokenSource source)
{
if (source.EndsWith('s'))
{
if (source.EndsWith("sses") || source.EndsWith("ies"))
{
source.Size -= 2;
}
else if (source.Size >= 2 && source.Buffer[source.Size - 2] != 's')
{
source.Size -= 1;
}
}
if (source.EndsWith("eed"))
{
var limit = source.Size - 3; // source.Length
if (source.NumberOfConsoantSequences(limit) > 0)
{
source.Size -= 1;
}
}
else
{
var limit = 0;
if (source.EndsWith("ed"))
{
limit = source.Size - 2;
}
else if (source.EndsWith("ing"))
{
limit = source.Size - 3;
}
if (limit != 0 && source.ContainsVowel(limit))
{
source.Size = limit;
if (
source.EndsWith("at") ||
source.EndsWith("bl") ||
source.EndsWith("iz")
)
{
source.InsertIntoBuffer('e');
}
else if (source.EndsWithDoubleConsonant())
{
var ch = source.LastChar;
if (ch != 'l' && ch != 's' && ch != 'z')
{
source.Size--;
}
}
else if (
source.NumberOfConsoantSequences(source.Size - 1) == 1 &&
source.HasCvcAt(source.Size - 1)
)
{
source.InsertIntoBuffer('e');
}
}
}
}
