//*
// * Parses a regular expression character set. This method handles
// * the contents of the '[...]' construct in a regular expression.
// *
// * @return the element representing this character set
// *
// * @throws RegExpException if an error was encountered in the
// * pattern string
//
private Element ParseCharSet()
{
CharacterSetElement charset = default(CharacterSetElement);
Element elem = default(Element);
bool repeat = true;
char start = '\0';
char end = '\0';
if (PeekChar(0) == Convert.ToInt32('^'))
{
ReadChar('^');
charset = new CharacterSetElement(true);
}
else
{
charset = new CharacterSetElement(false);
}
while (PeekChar(0) > 0 && repeat)
{
start = Convert.ToChar(PeekChar(0));
switch (start)
{
case ']':
repeat = false;
break;
case '\\':
elem = ParseEscapeChar();
if (elem is StringElement)
{
charset.AddCharacters((StringElement)elem);
}
else
{
charset.AddCharacterSet((CharacterSetElement)elem);
}
break;
default:
ReadChar(start);
if (PeekChar(0) == Convert.ToInt32('-') && PeekChar(1) > 0 && PeekChar(1) != Convert.ToInt32(']'))
{
ReadChar('-');
end = ReadChar();
charset.AddRange(FixChar(start), FixChar(end));
}
else
{
charset.AddCharacter(FixChar(start));
}
break;
}
}
return(charset);
}
//*
// * Checks if the specified character is present in the user-
// * defined set. This method does not consider the inverted
// * flag.
// *
// * @param value the character to check
// *
// * @return true if the character is present, or
// * false otherwise
//
private bool InUserSet(char value)
{
object obj = null;
char c = '\0';
Range r = default(Range);
CharacterSetElement e = default(CharacterSetElement);
for (int i = 0; i <= contents.Count - 1; i++)
{
obj = contents[i];
if (obj is char)
{
c = (char)obj;
if (c == value)
{
return(true);
}
}
else if (obj is Range)
{
r = (Range)obj;
if (r.Inside(value))
{
return(true);
}
}
else if (obj is CharacterSetElement)
{
e = (CharacterSetElement)obj;
if (e.InSet(value))
{
return(true);
}
}
}
return(false);
}
//*
// * Adds a character subset to this character set.
// *
// * @param elem the character set to add
//
public void AddCharacterSet(CharacterSetElement elem)
{
contents.Add(elem);
}
