/// <summary>
/// Compiles the pattern.
/// </summary>
public static IEnumerable <iToken> Compile(string pPattern)
{
List <iToken> tokens = new List <iToken>();
StringReader reader = new StringReader(pPattern);
int c;
while ((c = reader.Read()) != -1)
{
string s = ((char)c).ToString(CultureInfo.InvariantCulture);
switch (s)
{
case "#":
tokens.Add(new TokenDigit());
break;
case "@":
tokens.Add(new TokenAlpha());
break;
case "*":
tokens.Add(new TokenWild());
break;
case "|":
tokens.Add(new TokenOr());
break;
case "(":
tokens.Add(new TokenGroup(ReadGroup(reader)));
break;
case "[":
tokens.Add(new TokenSet(ReadSet(reader)));
break;
case "?":
iToken prev = tokens.LastOrDefault();
if (prev == null)
{
continue;
}
tokens.Remove(prev);
tokens.Add(new TokenOptional(prev));
break;
default:
if (TokenWild.All.Contains(s) ||
s == ".")
{
tokens.Add(new TokenStatic(s));
}
break;
}
}
return(tokens);
}
/// <summary>
/// Constructor
/// </summary>
public TokenOptional(iToken pToken)
{
_token = pToken;
}