/// <summary>
/// Initializes a new instance of the <see cref="Subrule"/> class.
/// </summary>
/// <param name="rhs">The RHS.</param>
/// <param name="env">The environment.</param>
/// <param name="rule">The phonological rule.</param>
/// <exception cref="System.ArgumentException">Thrown when the size of the RHS is greater than the
/// size of the specified rule's LHS and the LHS's size is greater than 1. A standard phonological
/// rule does not currently support this type of widening.</exception>
public Subrule(PhoneticPattern rhs, Environment env, StandardPhonologicalRule rule)
{
m_rhs = rhs;
m_env = env;
m_rule = rule;
switch (Type)
{
case ChangeType.NARROW:
case ChangeType.EPENTHESIS:
// analysis target is a copy of the RHS, because there is no LHS
m_analysisTarget = m_rhs.Clone();
break;
case ChangeType.WIDEN:
// before generating the analysis we must extend the length of the LHS
// to match the length of the RHS
PhoneticPattern lhs = m_rule.m_lhs.Clone();
while (lhs.Count != m_rhs.Count)
{
lhs.Add(lhs.First.Clone());
}
m_analysisTarget = m_rhs.Combine(lhs);
break;
case ChangeType.FEATURE:
m_analysisTarget = m_rhs.Combine(m_rule.m_lhs);
break;
case ChangeType.UNKNOWN:
throw new ArgumentException(HCStrings.kstidInvalidSubruleType, "rhs");
}
}
PhoneticPattern GenerateChangePartition(PhoneticPattern lhs, PhoneticPattern rhs)
{
PhoneticPattern result = new PhoneticPattern();
foreach (PhoneticPatternNode node in lhs)
{
switch (node.Type)
{
case PhoneticPatternNode.NodeType.SIMP_CTXT:
PhoneticPattern temp = new PhoneticPattern();
temp.Add(node.Clone());
// generates the RHS template the same way that phonological rules generate their
// RHS analysis targets
result.AddMany(rhs.Combine(temp));
break;
case PhoneticPatternNode.NodeType.PATTERN:
NestedPhoneticPattern nestedPattern = node as NestedPhoneticPattern;
PhoneticPattern pattern = GenerateChangePartition(nestedPattern.Pattern, rhs);
NestedPhoneticPattern newNestedPattern = new NestedPhoneticPattern(pattern, nestedPattern.MinOccur,
nestedPattern.MaxOccur);
result.Add(newNestedPattern);
break;
}
}
return(result);
}
