public ENFA_Regex_Match(ENFA_Regex_Transition transition, bool consumesChar)
{
_transition = transition;
_consumesChar = consumesChar;
}
private void AddCharacterGroup(ENFA_Regex_Transition activeTransition, StreamReader reader)
{
bool exit = false;
if (PeekNextChar(reader) == Constants.RightSquareBracket)
{
ThrowBuildException(ErrorText.CharacterClassEmpty);
}
while (!exit)
{
char?nextChar = NextCharInStream(reader);
char?tempNextChar = PeekNextChar(reader);
if (!nextChar.HasValue)
{
exit = true;
}
else
{
if (nextChar.Value == Constants.RightSquareBracket)
{
exit = true;
}
else if (nextChar.Value == Constants.Backslash)
{
if (tempNextChar.Value == 'n')
{
ConsumeNextChar(reader);// Consume New Line
activeTransition.AddLiteral(Constants.NewLine);
}
else if (tempNextChar.Value == 'v')
{
ConsumeNextChar(reader);// Consume Vertical Tab
activeTransition.AddLiteral(Constants.VerticalTab);
}
else if (tempNextChar.Value == 't')
{
ConsumeNextChar(reader);// Consume Horizontal Tab
activeTransition.AddLiteral(Constants.HorizontalTab);
}
else if (tempNextChar.Value == Constants.Backslash)
{
ConsumeNextChar(reader);// Consume Backslash
activeTransition.AddLiteral(Constants.Backslash);
}
else if (tempNextChar.Value == 'f')
{
ConsumeNextChar(reader);// Consume Form Feed
activeTransition.AddLiteral(Constants.FormFeed);
}
else if (tempNextChar.Value == 'r')
{
ConsumeNextChar(reader);// Consume Carriage Return
activeTransition.AddLiteral(Constants.CarriageReturn);
}
else if (tempNextChar.Value == '0')
{
ConsumeNextChar(reader);// Consume Null Char
activeTransition.AddLiteral(Constants.NullChar);
}
else if (tempNextChar.Value == 'a')
{
ConsumeNextChar(reader);// Consume Alert
activeTransition.AddLiteral(Constants.Alert);
}
else if (tempNextChar.Value == 'e')
{
ConsumeNextChar(reader);// Consume Escape
activeTransition.AddLiteral(Constants.Escape);
}
else if (tempNextChar.Value == 'y')
{
ConsumeNextChar(reader);// Consume Backspace
activeTransition.AddLiteral(Constants.Backspace);
}
else
{
ThrowBuildException(ErrorText.CharacterClassEscapedWithoutBeingExpectedTo);
}
}
else
{
if (tempNextChar.HasValue && tempNextChar.Value == Constants.HyphenMinusSign)
{
/* Char range */
ConsumeNextChar(reader);// Consume Hyphen Minus Sign
char?endRange = NextCharInStream(reader);
if (!endRange.HasValue)
{
ThrowBuildException(ErrorText.CharacterRangeHasNoEndValue);
}
int lowCounter = (int)nextChar.Value;
int highCounter = (int)endRange.Value;
if (lowCounter > highCounter)
{
int temp = lowCounter;
lowCounter = highCounter;
highCounter = temp;
}
for (int counter = lowCounter; counter <= highCounter; counter += 1)
{
activeTransition.AddLiteral((char)counter);
}
}
else
{
activeTransition.AddLiteral(nextChar.Value);
}
}
}
}
}
