static MediaQuery Consume_MediaQuery(DataConsumer <CssToken> Stream = null)
{/* Docs: https://drafts.csswg.org/mediaqueries-4/#mq-syntax */
if (Stream is null)
{
throw new CssParserException(CssErrors.STREAM_IS_NULL);
}
if (Stream.Next.Type != ECssTokenType.Ident)
{
throw new CssSyntaxErrorException(CssErrors.EXPECTING_IDENT, Stream);
}
EMediaQueryModifier modifier = 0x0;
EMediaType mediaType = 0x0;
LinkedList <IMediaCondition> conditionList = new LinkedList <IMediaCondition>();
/* First check for media modifier */
if (Stream.Next.Type != ECssTokenType.Ident)
{
throw new CssSyntaxErrorException(CssErrors.EXPECTING_IDENT, Stream);
}
if (Lookup.TryEnum((Stream.Next as IdentToken).Value, out EMediaQueryModifier mod))
{
Stream.Consume();// consume this token
modifier = mod;
}
/* Skip 'and' keyword if present */
if (ParserCommon.Is_Combinator(Stream.Next))
{
Stream.Consume();
}
/* Set the media type */
if (Stream.Next.Type != ECssTokenType.Ident)
{
throw new CssSyntaxErrorException(CssErrors.EXPECTING_IDENT, Stream);
}
if (!Lookup.TryEnum((Stream.Next as IdentToken).Value, out EMediaType type))
{
throw new CssParserException(String.Format(CultureInfo.InvariantCulture, CssErrors.INVALID_MEDIA_TYPE, (Stream.Next as IdentToken).Value), Stream);
}
else
{
Stream.Consume();
}
/* Skip thew first combinator keyword if present */
Consume_All_Whitespace(Stream);
if (ParserCommon.Is_Combinator(Stream.Next))
{
Stream.Consume();
}
/* Now consume media conditions until we cant anymore */
do
{
Consume_All_Whitespace(Stream);
if (Stream.Next.Type != ECssTokenType.Parenth_Open)
{/* This isn't invalid, it just signals that we have no more features to consume */
break;
}
var condition = Consume_Media_Condition(Stream);
conditionList.AddLast(condition);
}while (Stream.Next.Type != ECssTokenType.EOF);
return(new MediaQuery(modifier, mediaType, conditionList));
}
public MediaQuery(EMediaQueryModifier modifier, EMediaType mediaType, LinkedList <IMediaCondition> conditions)
{
Modifier = modifier;
MediaType = mediaType;
Conditions = conditions;
}
