/// <summary>
/// Tries to read and set media constraints for the provided medium.
/// </summary>
Boolean TrySetConstraint(CssMedium medium, ref CssToken token)
{
if (token.Type != CssTokenType.Ident)
{
_tokenizer.JumpToClosedArguments();
token = _tokenizer.Get();
return false;
}
var value = Pool.NewValueBuilder();
var featureName = token.Data;
var val = CssValue.Empty;
var feature = _parser.Options.IsToleratingInvalidConstraints ?
new UnknownMediaFeature(featureName) : Factory.MediaFeatures.Create(featureName);
token = _tokenizer.Get();
if (token.Type == CssTokenType.Colon)
{
_tokenizer.State = CssParseMode.Value;
token = _tokenizer.Get();
while (token.Type != CssTokenType.RoundBracketClose || value.IsReady == false)
{
if (token.Type == CssTokenType.Eof)
break;
value.Apply(token);
token = _tokenizer.Get();
}
_tokenizer.State = CssParseMode.Data;
val = value.ToPool();
}
else if (token.Type == CssTokenType.Eof)
return false;
if (feature != null && feature.TrySetValue(val))
{
medium.AddConstraint(feature);
return true;
}
return false;
}
