private static Nfa UnitRange(RegexCharacters unitRange, bool negate)
{
switch (unitRange)
{
case RegexCharactersUnit unit:
return(Character(unit.Character, negate));
case RegexCharactersRange range:
return(Range(range, negate));
}
throw new InvalidOperationException("Unreachable code detected.");
}
private RegexCharacterClass VisitCharacterClassNode(IInternalTreeNode node)
{
RegexCharacters characterRange = null;
RegexCharacterClass characterClass = null;
foreach (var internalNode in node.Children.OfType <IInternalTreeNode>())
{
if (internalNode.Is(RegexGrammar.CharacterRange))
{
characterRange = VisitCharacterRangeNode(internalNode);
}
else if (internalNode.Is(RegexGrammar.CharacterClass))
{
characterClass = VisitCharacterClassNode(internalNode);
}
}
if (characterClass == null)
{
return(new RegexCharacterClass(characterRange));
}
return(new RegexCharacterClassAlteration(characterRange, characterClass));
}
public RegexCharacterClass(RegexCharacters characterRange)
{
CharacterRange = characterRange;
}
public RegexCharacterClassAlteration(RegexCharacters characterRange, RegexCharacterClass characterClass)
: base(characterRange)
{
CharacterClass = characterClass;
}