public IFilter Parse()
{
var tokenizer = new Tokenizer(Filter);
tokens = tokenizer.Tokenize();
pos = -2;
string conjunction;
FilterSet filter = new FilterAndSet();
IFilter thisFilter;
IFilter last;
FilterOrSet orSet;
while (++pos < tokens.Count)
{
conjunction = pos == -1 ? "," : tokens[pos];
var name = GetNextToken("field name");
var oper = GetNextToken("operator");
var value = GetNextToken("value");
if (Tokens.IsListStart(value))
{
var values = new List <string>();
while (!Tokens.IsListEnd(GetNextToken("value")))
{
values.Add(tokens[pos]);
}
thisFilter = new ListFilter(name, oper, values);
}
else
{
thisFilter = new Filter(name, oper, value);
}
if (conjunction == ",") // and
{
filter.Add(thisFilter);
}
else if (conjunction == "|") // or
{
last = filter.Last();
if (!(last is FilterOrSet))
{
filter.RemoveAt(filter.Count - 1);
orSet = new FilterOrSet();
orSet.Add(last);
orSet.Add(thisFilter);
filter.Add(orSet);
}
else
{
((FilterOrSet)last).Add(thisFilter);
}
}
else
{
throw new ParseException("Parser: Unexpected '{0}', expected conjunction instead.", conjunction);
}
}
return(filter);
}
public List <string> Tokenize()
{
tokens = new List <string>();
value = String.Empty;
char valueQuoteCharacter = '\0';
bool valueIsQuoted = false;
bool inList = false;
pos = -1;
while (true)
{
ResetValue();
while (++pos < data.Length && ExpectToken(Tokens.IsFieldName))
{
value += data[pos];
}
if (String.IsNullOrWhiteSpace(value))
{
ParseError(true, "field name");
}
tokens.Add(value);
ResetValue();
while (++pos < data.Length && ExpectToken(Tokens.IsOperator))
{
value += data[pos];
}
if (String.IsNullOrWhiteSpace(value))
{
ParseError(true, "operator");
}
tokens.Add(value.Trim());
startParsingValue:
ResetValue();
valueIsQuoted = Tokens.IsQuote(GetNextCharacter("value"));
if (valueIsQuoted)
{
valueQuoteCharacter = data[pos];
}
else if (!inList && Tokens.IsListStart(data[pos]))
{
inList = true;
tokens.Add(data[pos].ToString());
goto startParsingValue;
}
else
{
value += data[pos];
}
while (++pos < data.Length)
{
if (Tokens.IsEscapeCharacter(data[pos]))
{
value += GetNextCharacter("any character");
}
else if ((valueIsQuoted && data[pos] == valueQuoteCharacter) || (!valueIsQuoted && NotExpectToken(Tokens.IsConjunction)) || (inList && NotExpectToken(Tokens.IsListEnd)))
{
break;
}
else
{
value += data[pos];
}
}
if (valueIsQuoted ? String.IsNullOrEmpty(value) : String.IsNullOrWhiteSpace(value))
{
ParseError(true, "value");
}
if (valueIsQuoted && pos >= data.Length) // if the value is quoted, we want a closing quote
{
ParseError(valueQuoteCharacter.ToString());
}
tokens.Add(valueIsQuoted ? value : value.Trim());
ResetValue();
if (inList)
{
if (Tokens.IsListEnd(GetNextCharacter("conjunction or list end")))
{
tokens.Add(data[pos].ToString());
inList = false;
}
else if (!Tokens.IsConjunction(data[pos]))
{
ParseError("conjunction");
}
else
{
goto startParsingValue;
}
}
if (++pos < data.Length)
{
if (Tokens.IsConjunction(data[pos]))
{
tokens.Add(data[pos].ToString());
}
else
{
ParseError("conjunction");
}
}
else
{
return(tokens);
}
}
}