Added running value

Author: FlorianRappl

src/AngleSharp.Css/Constants/CssKeywords.cs

@@ -1545,11 +1545,11 @@ public static class CssKeywords
         /// <summary>
         /// The open keyword.
         /// </summary>
-        public static readonly String Open;
+        public static readonly String Open = "open";
 
         /// <summary>
         /// The closed keyword.
         /// </summary>
-        public static readonly String Closed;
+        public static readonly String Closed = "closed";
     }
 }

src/AngleSharp.Css/Constants/FunctionNames.cs

@@ -256,5 +256,10 @@ public static class FunctionNames
         /// The content function.
         /// </summary>
         public static readonly String Content = "content";
+
+        /// <summary>
+        /// The running function.
+        /// </summary>
+        public static readonly String Running = "running";
     }
 }

src/AngleSharp.Css/Declarations/RunningDeclaration.cs

@@ -8,7 +8,7 @@ static class RunningDeclaration
     {
         public static String Name = PropertyNames.Running;
 
-        public static IValueConverter Converter = Any;
+        public static IValueConverter Converter = IdentifierConverter;
 
         public static ICssValue InitialValue = InitialValues.RunningDecl;
 

src/AngleSharp.Css/Parser/Micro/FunctionParser.cs

@@ -99,12 +99,31 @@ public static CssVarValue ParseVar(this StringSource source)
 
         public static CssContentValue ParseContent(this StringSource source)
         {
-            var name = source.ParseCustomIdent();
-            var f = source.SkipGetSkip();
+            if (source.IsFunction(FunctionNames.Content))
+            {
+                var name = source.ParseCustomIdent();
+                var f = source.SkipGetSkip();
+
+                if (name != null && f == Symbols.RoundBracketClose)
+                {
+                    return new CssContentValue(name);
+                }
+            }
 
-            if (name != null && f == Symbols.RoundBracketClose)
+            return null;
+        }
+
+        public static CssRunningValue ParseRunning(this StringSource source)
+        {
+            if (source.IsFunction(FunctionNames.Running))
             {
-                return new CssContentValue(name);
+                var name = source.ParseCustomIdent();
+                var f = source.SkipGetSkip();
+
+                if (name != null && f == Symbols.RoundBracketClose)
+                {
+                    return new CssRunningValue(name);
+                }
             }
 
             return null;

src/AngleSharp.Css/ValueConverters.cs

@@ -240,6 +240,11 @@ static class ValueConverters
         /// </summary>
         public static readonly IValueConverter ContentConverter = FromParser(FunctionParser.ParseContent);
 
+        /// <summary>
+        /// Creates a converter for the running function.
+        /// </summary>
+        public static readonly IValueConverter RunningConverter = FromParser(FunctionParser.ParseRunning);
+
         #endregion
 
         #region Maps
@@ -388,7 +393,7 @@ static class ValueConverters
         /// <summary>
         /// Represents a converter for the PositionMode enumeration.
         /// </summary>
-        public static readonly IValueConverter PositionModeConverter = Map.PositionModes.ToConverter();
+        public static readonly IValueConverter PositionModeConverter = Or(Map.PositionModes.ToConverter(), RunningConverter);
 
         /// <summary>
         /// Represents a converter for the OverflowMode enumeration.

src/AngleSharp.Css/Values/Functions/CssRunningValue.cs

@@ -0,0 +1,55 @@
+namespace AngleSharp.Css.Values
+{
+    using AngleSharp.Css.Dom;
+    using AngleSharp.Text;
+    using System;
+
+    /// <summary>
+    /// Represents a CSS running function call.
+    /// </summary>
+    sealed class CssRunningValue : ICssFunctionValue
+    {
+        #region Fields
+
+        private readonly String _ident;
+
+        #endregion
+
+        #region ctor
+
+        /// <summary>
+        /// Creates a new running function call.
+        /// </summary>
+        /// <param name="ident">The used identifier argument.</param>
+        public CssRunningValue(String ident)
+        {
+            _ident = ident;
+        }
+
+        #endregion
+
+        #region Properties
+
+        /// <summary>
+        /// Gets the used identifier.
+        /// </summary>
+        public String Identifier => _ident;
+
+        /// <summary>
+        /// Gets the name of the function.
+        /// </summary>
+        public String Name => FunctionNames.Running;
+
+        /// <summary>
+        /// Gets the arguments.
+        /// </summary>
+        public ICssValue[] Arguments => new ICssValue[] { new Identifier(_ident) };
+
+        /// <summary>
+        /// Gets the CSS text representation.
+        /// </summary>
+        public String CssText => Name.CssFunction(_ident);
+
+        #endregion
+    }
+}