private RegexCharacterClass VisitCharacterClassNode(IInternalTreeNode internalNode)
{
RegexCharacterUnitRange characterRange = null;
RegexCharacterClass characterClass = 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.CharacterRange == childInternalNodeSymbolValue)
{
characterRange = VisitCharacterRangeNode(childInternalNode);
}
else if (RegexGrammar.CharacterClass == childInternalNodeSymbolValue)
{
characterClass = VisitCharacterClassNode(childInternalNode);
}
}
if (characterClass != null)
{
return(new RegexCharacterClassAlteration(
characterRange,
characterClass));
}
return(new RegexCharacterClass(characterRange));
}
public RegexCharacterClassAlteration(
RegexCharacterUnitRange characterRange,
RegexCharacterClass characterClass)
: base(characterRange)
{
CharacterClass = characterClass;
_hashCode = ComputeHashCode();
}
private static INfa UnitRange(RegexCharacterUnitRange unitRange, bool negate)
{
switch (unitRange.NodeType)
{
case RegexNodeType.RegexCharacterUnitRange:
return(Character(unitRange.StartCharacter, negate));
case RegexNodeType.RegexCharacterRange:
var range = unitRange as RegexCharacterRange;
return(Range(range, negate));
}
throw new InvalidOperationException("Unreachable code detected.");
}
public RegexCharacterClass(RegexCharacterUnitRange characterRange)
{
CharacterRange = characterRange;
_hashCode = ComputeHashCode();
}