public override RuleEvaluation ShouldAddPhoneme(Phoneme phoneme, SyllableContext context)
{
if (context.Phonemes.Previous == null)
{
return(True());
}
// Sonority must always be decreasing once we have a nucleus
if (context.CurrentSyllable.HasNucleus())
{
var previous = context.Phonemes.Previous;
if (phoneme.Definition.Sonority > previous.Definition.Sonority)
{
return(False($"Phoneme '{phoneme.Letters}' has more sonority ({phoneme.Definition.Sonority}) than previous '{previous.Letters}' sonority ({previous.Definition.Sonority})."));
}
}
return(True());
}
public override RuleEvaluation ShouldAddPhoneme(Phoneme phoneme, SyllableContext context)
{
if (context.CurrentSyllable.HasNucleus())
{
if (phoneme.IsVowel())
{
return(False("Cannot have more than one vowel."));
}
var next = context.Phonemes.Next;
var previous = context.Phonemes.Previous;
if (previous == null || next == null)
{
return(True());
}
var isLast = context.Phonemes.Next == context.Phonemes.Last;
var isFirst = context.Phonemes.Previous == context.Phonemes.First;
if (phoneme.ArticulationManner == ArticulationManners.Aspirate)
{
return(False($"Coda cannot contain the aspirate '{phoneme.Letters}'"));
}
if (previous.Text == "ay")
{
return(False("Syllables with 'ay' nucleus do not have coda."));
}
if (previous.Text == "er" || (phoneme.Text == "l" && next.HasVowel()))
{
return(False("'er' or 'l' is always end of coda."));
}
if (phoneme.ArticulationManner == ArticulationManners.Fricative && phoneme.ArticulationPlace == ArticulationPlaces.Alveolar)
{
if (!context.CurrentSyllable.HasOnset() || phoneme.Text == "z")
{
return(False($"Syllable without onset cannot have coda that contains alveolar fricative '{phoneme.Letters}'"));
}
}
if (phoneme.ArticulationManner == ArticulationManners.Liquid)
{
return(True());
}
if (isFirst && previous.IsVowel())
{
return(True());
}
if (phoneme.ArticulationManner == ArticulationManners.Stop && next.ArticulationManner != ArticulationManners.Nasal)
{
if (next.HasVowel() || (previous.ArticulationManner != ArticulationManners.Nasal && next.ArticulationManner != ArticulationManners.Stop))
{
return(False("Onsets should begin with a stop unless adjacent to another stop or nasal."));
}
}
if (phoneme.ArticulationManner == ArticulationManners.Affricate && phoneme.ArticulationPlace == ArticulationPlaces.PostAlveolar)
{
if (previous.ArticulationManner == ArticulationManners.Nasal)
{
return(False($"Affricate postalveolar '{phoneme.Letters}' cannot come after nasal '{previous.Letters}'."));
}
}
if (context.Syllables.Count == 0)
{
if (context.CurrentSyllable.HasOnset() || (!isLast && !context.CurrentSyllable.HasPhonemeArticulationManner(ArticulationManners.Semivowel)))
{
return(True());
}
}
return(False("Consonant is onset of next syllable."));
}
return(True());
}