コード例 #1
0
ファイル: CssBuilder.cs プロジェクト: JackieyLi/AngleSharp
        /// <summary>
        /// Tries to read and set media constraints for the provided medium.
        /// </summary>
        Boolean TrySetConstraint(CssMedium medium, ref CssToken token)
        {
            if (token.Type != CssTokenType.Ident)
            {
                _tokenizer.JumpToClosedArguments();
                token = _tokenizer.Get();
                return(false);
            }

            var value       = Pool.NewValueBuilder();
            var featureName = token.Data;
            var val         = CssValue.Empty;
            var feature     = _parser.Options.IsToleratingInvalidConstraints ?
                              new UnknownMediaFeature(featureName) : Factory.MediaFeatures.Create(featureName);

            token = _tokenizer.Get();

            if (token.Type == CssTokenType.Colon)
            {
                _tokenizer.State = CssParseMode.Value;
                token            = _tokenizer.Get();

                while (token.Type != CssTokenType.RoundBracketClose || value.IsReady == false)
                {
                    if (token.Type == CssTokenType.Eof)
                    {
                        break;
                    }

                    value.Apply(token);
                    token = _tokenizer.Get();
                }

                _tokenizer.State = CssParseMode.Data;

                val = value.ToPool();
            }
            else if (token.Type == CssTokenType.Eof)
            {
                return(false);
            }

            if (feature != null && feature.TrySetValue(val))
            {
                medium.AddConstraint(feature);
                return(true);
            }

            return(false);
        }
コード例 #2
0
ファイル: CssBuilder.cs プロジェクト: mganss/AngleSharp
        /// <summary>
        /// Scans the current medium for the @media or @import rule.
        /// </summary>
        public CssMedium CreateMedium(ref CssToken token)
        {
            var medium = new CssMedium();

            CollectTrivia(ref token);

            if (token.Type == CssTokenType.Ident)
            {
                var identifier = token.Data;

                if (identifier.Isi(Keywords.Not))
                {
                    medium.IsInverse = true;
                    token            = NextToken();
                    CollectTrivia(ref token);
                }
                else if (identifier.Isi(Keywords.Only))
                {
                    medium.IsExclusive = true;
                    token = NextToken();
                    CollectTrivia(ref token);
                }
            }

            if (token.Type == CssTokenType.Ident)
            {
                medium.Type = token.Data;
                token       = NextToken();
                CollectTrivia(ref token);

                if (token.Type != CssTokenType.Ident || !token.Data.Isi(Keywords.And))
                {
                    return(medium);
                }

                token = NextToken();
                CollectTrivia(ref token);
            }

            do
            {
                if (token.Type != CssTokenType.RoundBracketOpen)
                {
                    return(null);
                }

                token = NextToken();
                CollectTrivia(ref token);
                CreateNewNode();
                var feature = CloseNode(CreateFeature(ref token));

                if (feature != null)
                {
                    medium.AddConstraint(feature);
                }

                if (token.Type != CssTokenType.RoundBracketClose)
                {
                    return(null);
                }

                token = NextToken();
                CollectTrivia(ref token);

                if (feature == null)
                {
                    return(null);
                }

                if (token.Type != CssTokenType.Ident || !token.Data.Isi(Keywords.And))
                {
                    break;
                }

                token = NextToken();
                CollectTrivia(ref token);
            }while (token.Type != CssTokenType.Eof);

            return(medium);
        }