private static RegexCharacterUnitRange VisitCharacterRangeNode(IInternalTreeNode internalNode)
{
RegexCharacterClassCharacter start = null;
RegexCharacterClassCharacter end = null;
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Internal)
{
continue;
}
var childInternalNode = child as IInternalTreeNode;
var childInternalNodeSymbolValue = childInternalNode.Symbol.Value;
if (RegexGrammar.CharacterClassCharacter == childInternalNodeSymbolValue)
{
if (start is null)
{
start = VisitCharacterClassCharacterNode(childInternalNode);
}
else
{
end = VisitCharacterClassCharacterNode(childInternalNode);
}
}
}
if (end != null)
{
return(new RegexCharacterRange(start, end));
}
return(new RegexCharacterUnitRange(start));
}
public RegexCharacterRange(
RegexCharacterClassCharacter startCharacter,
RegexCharacterClassCharacter endCharacter)
: base(startCharacter)
{
EndCharacter = endCharacter;
_hashCode = ComputeHashCode();
}
private static INfa Character(RegexCharacterClassCharacter character, bool negate)
{
var start = new NfaState();
var end = new NfaState();
var terminal = CreateTerminalForCharacter(character.Value, character.IsEscaped, negate);
var transition = new TerminalNfaTransition(
terminal: terminal,
target: end);
start.AddTransistion(transition);
return(new Nfa(start, end));
}
public RegexCharacterUnitRange(RegexCharacterClassCharacter startCharacter)
{
StartCharacter = startCharacter;
_hashCode = ComputeHashCode();
}
