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 == null)
{
start = VisitCharacterClassCharacterNode(childInternalNode);
}
else
{
end = VisitCharacterClassCharacterNode(childInternalNode);
}
}
}
if (end != null)
{
return(new RegexCharacterRange(start, end));
}
return(new RegexCharacterUnitRange(start));
}
private static RegexCharacters VisitCharacterRangeNode(IInternalTreeNode node)
{
RegexCharacterClassCharacter start = null;
RegexCharacterClassCharacter end = null;
foreach (var internalNode in node.Children.OfType <IInternalTreeNode>())
{
if (internalNode.Is(RegexGrammar.CharacterClassCharacter))
{
if (start == null)
{
start = VisitCharacterClassCharacterNode(internalNode);
}
else
{
end = VisitCharacterClassCharacterNode(internalNode);
}
}
}
if (end == null)
{
return(new RegexCharactersUnit(start));
}
return(new RegexCharactersRange(start, end));
}
public RegexCharacterRange(
RegexCharacterClassCharacter startCharacter,
RegexCharacterClassCharacter endCharacter)
: base(startCharacter)
{
EndCharacter = endCharacter;
_hashCode = ComputeHashCode();
}
private static Nfa Character(RegexCharacterClassCharacter character, bool negate)
{
var start = new NfaState();
var end = new NfaState();
var terminal = CreateTerminalForCharacter(character.Value, character.IsEscaped, negate);
start.AddTransition(terminal, end);
return(new Nfa(start, end));
}
private static INfa Character(RegexCharacterClassCharacter character, bool negate)
{
var start = new NfaState();
var end = new NfaState();
ITerminal terminal = new CharacterTerminal(character.Value);
if (negate)
terminal = new NegationTerminal(terminal);
var transition = new TerminalNfaTransition(
terminal: terminal,
target: end);
start.AddTransistion(transition);
return new Nfa(start, end);
}
private static INfa Character(RegexCharacterClassCharacter character, bool negate)
{
var start = new NfaState();
var end = new NfaState();
ITerminal terminal = null;
if (!character.IsEscaped)
{
terminal = new CharacterTerminal(character.Value);
}
else
{
switch (character.Value)
{
case 's':
terminal = new WhitespaceTerminal();
break;
case 'd':
terminal = new DigitTerminal();
break;
case 'w':
terminal = new WordTerminal();
break;
case 'D':
terminal = new DigitTerminal();
negate = !negate;
break;
case 'S':
terminal = new WhitespaceTerminal();
negate = !negate;
break;
case 'W':
terminal = new WordTerminal();
negate = !negate;
break;
default:
terminal = new CharacterTerminal(character.Value);
break;
}
}
if (negate)
{
terminal = new NegationTerminal(terminal);
}
var transition = new TerminalNfaTransition(
terminal: terminal,
target: end);
start.AddTransistion(transition);
return(new Nfa(start, end));
}
public RegexCharacterUnitRange(RegexCharacterClassCharacter startCharacter)
{
StartCharacter = startCharacter;
_hashCode = ComputeHashCode();
}
