/// <summary>
/// Consumes and returns an An+B token from a <see cref="TokenStream"/>
/// </summary>
/// <param name="Tokens"></param>
/// <returns></returns>
public static CssAnBMatcher Consume(DataConsumer <CssToken> Stream)
{
// TODO: Test An+B syntax parsing
int A = 0;
int B = 0;
if (Stream.Next.Type == ECssTokenType.Ident)// this token is a word, but we only accept 'even' or 'odd'
{
IdentToken word = Stream.Consume <IdentToken>();
if (word.Value.Equals("even", StringComparison.OrdinalIgnoreCase))
{
return(new CssAnBMatcher(2, 0)); //{ A = 2; B = 0; }
}
else if (word.Value.Equals("odd", StringComparison.OrdinalIgnoreCase))
{
return(new CssAnBMatcher(2, 1)); //{ A = 2; B = 1; }
}
else
{
throw new CssSyntaxErrorException($"Invalid identity token ({word.Value}) within An+B syntax");
}
// if (Stream.Next != Stream.EOF_ITEM) throw new CssSyntaxError("Expected EOF!");
// return null;
}
else if (Stream.Next.Type == ECssTokenType.Dimension)
{
DimensionToken dim = Stream.Consume() as DimensionToken;
if (dim.DataType == ENumericTokenType.Integer && dim.Unit.Equals("n", StringComparison.OrdinalIgnoreCase))
{// <n-dimension>
throw new NotImplementedException($"{nameof(CssAnBMatcher)} Has not implemented parsing support for {nameof(ECssTokenType.Dimension)}");
}
else if (dim.DataType == ENumericTokenType.Integer && dim.Unit.Equals("n-", StringComparison.OrdinalIgnoreCase))
{// <ndash-dimension>
throw new NotImplementedException($"{nameof(CssAnBMatcher)} Has not implemented parsing support for {nameof(ECssTokenType.Dimension)}");
}
else if (dim.DataType == ENumericTokenType.Integer && dim.Unit.StartsWith("n-", StringComparison.OrdinalIgnoreCase))
{// <ndashdigit-dimension>
throw new NotImplementedException($"{nameof(CssAnBMatcher)} Has not implemented parsing support for {nameof(ECssTokenType.Dimension)}");
}
}
else if (Stream.Next.Type == ECssTokenType.Ident)
{
throw new NotImplementedException($"{nameof(CssAnBMatcher)} Has not implemented parsing support for {nameof(ECssTokenType.Ident)}");
}
else if (Stream.Next.Type == ECssTokenType.Number)
{
throw new NotImplementedException($"{nameof(CssAnBMatcher)} Has not implemented parsing support for {nameof(ECssTokenType.Number)}");
}
return(new CssAnBMatcher(A, B));
}
public void EncodeTest(ENumericTokenType Type, string Value, double Number, string Unit, string Expected)
{
string Actual = new DimensionToken(Type, Value, Number, Unit).Encode();
Assert.Equal(Expected, Actual);
}
