Cannot parse css for a tag

[qinlili23333]

Prerequisites

• Can you reproduce the problem in a MWE?
• Are you running the latest version of AngleSharp.Css?
• Did you check the FAQs to see if that helps you?
• Are you reporting to the correct repository? (there are multiple AngleSharp libraries, e.g., AngleSharp.Xml for Xml support)
• Did you perform a search in the issues?

Description

a
{
	text-decoration: none;
}

will generate invalid css:

 {
	text-decoration: none;
}

Steps to Reproduce

using AngleSharp;
using AngleSharp.Css;
using AngleSharp.Css.Parser;

namespace AngleSharpCssBugReport
{
    internal class Program
    {
		static string cssString = @"img
{
	max-height: 98%;
	max-width: 100%;
}
a
{
	text-decoration: none;
}";

        private static readonly CssParserOptions CssParserOptions = new()
        {
            IsIncludingUnknownDeclarations = true,
            IsIncludingUnknownRules = true,
            IsToleratingInvalidSelectors = true
        };
        static void Main(string[] args)
        {
            Console.WriteLine("AngleSharp Version:" + typeof(AngleSharp.BrowsingContext).Assembly.GetName().Version);
            Console.WriteLine("AngleSharp.CSS Version:"+ typeof(CssParser).Assembly.GetName().Version);
            Console.WriteLine("Original CSS:");
            Console.Write(cssString);
            Console.WriteLine();
            var cssParser = new CssParser(CssParserOptions);
            var stylesheet = cssParser.ParseStyleSheet(cssString);
            var stringWriter = new StringWriter();
            IStyleFormatter formatter = new PrettyStyleFormatter();
            stylesheet.ToCss(stringWriter, formatter);
            Console.WriteLine("Processed CSS:");
            Console.Write(stringWriter.ToString());
            Console.WriteLine();
        }
    }
}

  <ItemGroup>
    <PackageReference Include="AngleSharp" Version="1.3.1-beta.491" />
    <PackageReference Include="AngleSharp.Css" Version="1.0.0-beta.157" />
  </ItemGroup>

Expected Behavior

should generate valid css for a tag

Actual Behavior

generate empty selector

AngleSharp Version:1.3.1.0
AngleSharp.CSS Version:1.0.0.0
Original CSS:
img
{
        max-height: 98%;
        max-width: 100%;
}
a
{
        text-decoration: none;
}
Processed CSS:
img {
        max-height: 98%;
        max-width: 100%;
}

 {
        text-decoration: none;
}

Possible Solution / Known Workarounds

don't know

[FlorianRappl]

This is indeed a problem - the root cause is in the tokenizer w.r.t. the carriage return (if you replace \r\n with \n it works, similar if the code would be a { ... } instead of a\r\n { ... } it would also work).

Right now its unclear if this is a general tokenizer problem and requires fixing in AngleSharp directly, or if we can just patch this in AngleSharp.Css / the tokenizer. Will be investigated and fixed.

Thanks for the report!

[FlorianRappl]

This will be fixed with AngleSharp itself - 1.4.0 is the release to fix it.