/// <summary>
/// Creates a style sheet for the given response asynchronously.
/// </summary>
/// <param name="response">
/// The response with the stream representing the source of the
/// stylesheet.
/// </param>
/// <param name="options">
/// The options with the parameters for evaluating the style.
/// </param>
/// <param name="cancel">The cancellation token.</param>
/// <returns>The task resulting in the style sheet.</returns>
public async Task<IStyleSheet> ParseStylesheetAsync(IResponse response, StyleOptions options, CancellationToken cancel)
{
var context = options.Context;
var configuration = context.Configuration;
var parser = new CssParser(_options, configuration);
var url = response.Address?.Href;
var sheet = new CssStyleSheet(parser, url, options.Element) { IsDisabled = options.IsDisabled };
var source = new TextSource(response.Content);
var tokenizer = new CssTokenizer(source);
tokenizer.Error += (_, ev) => context.Fire(ev);
var builder = new CssBuilder(tokenizer, parser);
context.Fire(new CssParseEvent(sheet, completed: false));
await parser.ParseStylesheetAsync(sheet, source).ConfigureAwait(false);
context.Fire(new CssParseEvent(sheet, completed: true));
return sheet;
}
