// Basically, it's realy common for background-position to be something like "0px -20px", which shouldn't be interpretted as a math value
// so detect the case where two number with unit values are separated by whitespace and treat them as a compound value instead
// otherwise, fallback to normal parsing
internal static Value ParseBackgroundPositionValue(ParserStream stream)
{
var start = stream.Position;
var valueStr = new StringBuilder();
stream.ScanUntilWithNesting(valueStr, ';');
var value = valueStr.ToString();
var parts = value.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
var pos = Position.Create(start, stream.Position, Current.CurrentFilePath);
// something's up
if (parts.Length != 2)
{
return(MoreValueParser.Parse(value, pos));
}
var p1 = parts[0];
var p2 = parts[1];
var v1 = MoreValueParser.Parse(p1, pos);
var v2 = MoreValueParser.Parse(p2, pos);
if (v1 is NumberWithUnitValue && v2 is NumberWithUnitValue)
{
return(new CompoundValue(v1, v2));
}
return(MoreValueParser.Parse(value, pos));
}
internal static Value ParseFontLikeValue(ParserStream stream)
{
var start = stream.Position;
var valueStr = new StringBuilder();
stream.ScanUntilWithNesting(valueStr, ';');
var value = valueStr.ToString();
// The shorthand isn't in use, so we can handle this
if (value.IndexOf('/') == -1)
{
return(MoreValueParser.Parse(value, Position.Create(start, stream.Position, Current.CurrentFilePath)));
}
return(new StringValue(value));
}
private static MediaQuery ParseMediaClause(string media, IPosition forPosition)
{
if (!media.StartsWith("(") || !media.EndsWith(")"))
{
Current.RecordError(ErrorType.Parser, forPosition, "Media features must be enclosed in paranthesis, found '" + media + "'");
throw new StoppedParsingException();
}
// Trim leading ( and trailing )
media = media.Substring(1, media.Length - 2).Trim();
var i = media.IndexOf(':');
if (i == -1)
{
if (!IsValidFeatureName(media))
{
Current.RecordError(ErrorType.Parser, forPosition, "Media feature not recognized, found '" + media + "'");
throw new StoppedParsingException();
}
return(new FeatureMedia(media, forPosition));
}
var feature = media.Substring(0, i).Trim();
var valueStr = media.Substring(i + 1).Trim();
var value = MoreValueParser.Parse(valueStr, forPosition);
var math = value as MathValue;
if (math != null)
{
// Ratio check
if (math.Operator == Operator.Div && IsRatioFeature(feature))
{
var ratio = new RatioValue(math.LeftHand, math.RightHand);
ratio.Start = value.Start;
ratio.Stop = value.Stop;
ratio.FilePath = value.FilePath;
value = ratio;
}
}
if (feature.StartsWith("min-", StringComparison.InvariantCultureIgnoreCase))
{
feature = feature.Substring("min-".Length);
if (!IsValidMinMaxFeatureName(feature))
{
Current.RecordError(ErrorType.Parser, forPosition, "Media feature not recognized in min clause, found '" + feature + "'");
throw new StoppedParsingException();
}
return(new MinFeatureMedia(feature, value, forPosition));
}
if (feature.StartsWith("max-", StringComparison.InvariantCultureIgnoreCase))
{
feature = feature.Substring("max-".Length);
if (!IsValidMinMaxFeatureName(feature))
{
Current.RecordError(ErrorType.Parser, forPosition, "Media feature not recognized in max clause, found '" + feature + "'");
throw new StoppedParsingException();
}
return(new MaxFeatureMedia(feature, value, forPosition));
}
return(new EqualFeatureMedia(feature, value, forPosition));
}
internal static Value ParseFuncValue(ParserStream stream, IPosition forPosition, bool allowSelectorIncludes)
{
stream.Advance(); // skip @
var buffer = new StringBuilder();
var c = stream.Peek();
while (char.IsWhiteSpace(c))
{
stream.Advance();
c = stream.Peek();
}
if (!char.IsLetter(c) && c != '(')
{
Current.RecordError(ErrorType.Parser, forPosition, "Expected letter or '(', found '" + c + "'");
throw new StoppedParsingException();
}
if (c != '(')
{
buffer.Append(stream.Read());
while (stream.HasMore() && char.IsLetterOrDigit(stream.Peek()))
{
buffer.Append(stream.Read());
}
}
var funcName = buffer.ToString();
buffer.Clear();
while (stream.HasMore() && char.IsWhiteSpace(stream.Peek()))
{
buffer.Append(stream.Read());
}
if (stream.HasMore() && stream.Peek() == '(')
{
stream.Read(); // Skip (
buffer.Clear();
stream.ScanUntilWithNesting(buffer, ')');
if (funcName.Length == 0)
{
if (allowSelectorIncludes)
{
var sel = Selector.Parse(buffer.ToString(), forPosition.Start, forPosition.Stop, forPosition.FilePath);
return(new IncludeSelectorValue(sel));
}
return(new StringValue("@(" + buffer + ")"));
}
var value = MoreValueParser.Parse(buffer.ToString().Trim(), forPosition, allowSelectorIncludes: true);
if (value is NotFoundValue)
{
throw new StoppedParsingException();
}
var @params = new List <Value>();
if (value is CommaDelimittedValue)
{
@params.AddRange(((CommaDelimittedValue)value).Values);
}
else
{
@params.Add(value);
}
return(new FuncAppliationValue(funcName, @params));
}
return(new FuncValue(funcName));
}