private void byAttribute()
{
TokenQueue cq = new TokenQueue(tq.ChompBalanced('[', ']')); // content queue
string key = cq.ConsumeToAny("=", "!=", "^=", "$=", "*=", "~="); // eq, not, start, end, contain, match, (no val)
if (key.Length == 0)
throw Failure.EmptyString("key");
cq.ConsumeWhitespace();
if (cq.IsEmpty) {
if (key.StartsWith("^", StringComparison.Ordinal))
evals.Add(new Evaluator.AttributeStarting(key.Substring(1)));
else
evals.Add(new Evaluator.Attribute(key));
} else {
if (cq.MatchChomp("="))
evals.Add(new Evaluator.AttributeWithValue(key, cq.Remainder()));
else if (cq.MatchChomp("!="))
evals.Add(new Evaluator.AttributeWithValueNot(key, cq.Remainder()));
else if (cq.MatchChomp("^="))
evals.Add(new Evaluator.AttributeWithValueStarting(key, cq.Remainder()));
else if (cq.MatchChomp("$="))
evals.Add(new Evaluator.AttributeWithValueEnding(key, cq.Remainder()));
else if (cq.MatchChomp("*="))
evals.Add(new Evaluator.AttributeWithValueContaining(key, cq.Remainder()));
else if (cq.MatchChomp("~="))
evals.Add(new Evaluator.AttributeWithValueMatching(key, new Regex(cq.Remainder())));
else
throw DomFailure.CannotParseAttributeQuery(query, cq.Remainder());
}
}