internal IElement Run()
{
Initialize();
bool escaping = false;
while (index < input.Length)
{
if (!escaping && input[index] == EscapeCharacter)
{
escaping = true;
}
else if (!escaping && parsingInfo.IsInitiator(input[index]))
{
initiatorCount++;
}
else if (!escaping && parsingInfo.IsTerminator(input[index]))
{
if (initiatorCount == 0)
{
int length;
var quantifier = GetQuantifier(index + 1, out length);
index += length;
return parsingInfo.ParseToken(token.Close(true), quantifier ?? Quantifier.One);
}
else
{
initiatorCount--;
}
}
else if (!escaping && parsingInfo.IsRoot && !ParsingInfo.FromInitiator(input[index]).IsRoot)
{
FinalizeElement(Quantifier.One);
var innerParser = new Parser(input.Substring(index + 1), Quantifier.One, ParsingInfo.FromInitiator(input[index]));
children.Add(innerParser.Run());
this.index += innerParser.index + 1;
}
else
{
int length;
var quantifier = GetQuantifier(index + 1, out length);
if (parsingInfo.AcceptMetacharacters && quantifier != null)
{
FinalizeElement(Quantifier.One);
token.Open();
token.Add(input[index], escaping);
FinalizeElement(quantifier);
index += length;
}
else
{
token.Open();
token.Add(input[index], escaping);
}
escaping = false;
}
index++;
}
if (!parsingInfo.IsRoot)
{
throw new RegexLiteException(String.Format("The specified regular expression cannot be parsed. " +
"Expected to find the closing character '{0}', but none was found.", parsingInfo.Terminator));
}
return GetResult();
}
/// <summary>
/// RegexLite text parser.
/// </summary>
/// <param name="input">The text to be parsed.</param>
/// <returns>A root element containing the resulting regular expression tree.</returns>
public static IElement Run(string input)
{
var parser = new Parser(input, Quantifier.One);
return parser.Run();
}
