public static ICssValue Collapse(this DeclarationInfo info, IDeclarationFactory factory, ICssValue[] longhands)
{
var initial = true;
var unset = true;
var child = true;
foreach (var longhand in longhands)
{
initial = initial && longhand is CssInitialValue;
unset = unset && longhand is CssUnsetValue;
child = child && longhand is CssChildValue;
}
if (initial)
{
return(new CssInitialValue(info.InitialValue));
}
else if (unset)
{
return(new CssUnsetValue(info.InitialValue));
}
else if (child)
{
return(((CssChildValue)longhands[0]).Parent);
}
return(info.Aggregator?.Merge(longhands));
}
public static ICssProperty[] CreateLonghands(this DeclarationInfo info, ICssValue value, Func <String, ICssValue, ICssProperty> createProperty)
{
var aggregator = info.Converter as IValueAggregator;
var longhands = info.Longhands;
if (value is ICssRawValue)
{
var child = new CssChildValue(value);
var values = Enumerable.Repeat(child, longhands.Length).ToArray();
return(CreateProperties(longhands, values, createProperty));
}
return(CreateProperties(longhands, aggregator?.Split(value), createProperty));
}
public static ICssValue[] Expand(this DeclarationInfo info, IDeclarationFactory factory, ICssValue value)
{
var longhands = info.Longhands;
if (value is ICssRawValue || value is CssChildValue)
{
var child = new CssChildValue(value);
return(Enumerable
.Repeat(child, longhands.Length)
.ToArray());
}
else if (value is CssInitialValue)
{
return(longhands
.Select(name => new CssInitialValue(factory.Create(name)?.InitialValue))
.OfType <ICssValue>()
.ToArray());
}
return(info.Aggregator?.Split(value));
}
public static IEnumerable <String> GetMappings(this DeclarationInfo info)
{
return(info.Longhands.Length > 0 ? info.Longhands : Enumerable.Repeat(info.Name, 1));
}
private static Boolean AllowsDeclaration(this IBrowsingContext context, DeclarationInfo info) => info.Flags != PropertyFlags.Unknown || context.IsAllowingUnknownDeclarations();
