/**
* Creates a copy of this transition but with another target
* state.
*
* @param state the new target state
*
* @return an identical copy of this transition
*/
public override NFATransition Copy(NFAState state)
{
NFACharRangeTransition copy;
copy = new NFACharRangeTransition(inverse, ignoreCase, state);
copy.contents = contents;
return(copy);
}
/**
* Parses a regular expression character set. This method handles
* the contents of the '[...]' construct in a regular expression.
*
* @param start the initial NFA state
*
* @return the terminating NFA state
*
* @throws RegExpException if an error was encountered in the
* pattern string
*/
private NFAState ParseCharSet(NFAState start)
{
NFAState end = new NFAState();
NFACharRangeTransition range;
char min;
char max;
if (PeekChar(0) == '^')
{
ReadChar('^');
range = new NFACharRangeTransition(true, ignoreCase, end);
}
else
{
range = new NFACharRangeTransition(false, ignoreCase, end);
}
start.AddOut(range);
while (PeekChar(0) > 0)
{
min = (char)PeekChar(0);
switch (min)
{
case ']':
return(end);
case '\\':
range.AddCharacter(ReadEscapeChar());
break;
default:
ReadChar(min);
if (PeekChar(0) == '-' &&
PeekChar(1) > 0 &&
PeekChar(1) != ']')
{
ReadChar('-');
max = ReadChar();
range.AddRange(min, max);
}
else
{
range.AddCharacter(min);
}
break;
}
}
return(end);
}