private ObservableIndex <PathInfoLight, Ref <IHelperDescriptor <TOptions> >, IEqualityComparer <PathInfoLight> > CreateHelpersSubscription <TOptions>(
IIndexed <string, IHelperDescriptor <TOptions> > source)
where TOptions : struct, IHelperOptions
{
var equalityComparer = Compatibility.RelaxedHelperNaming ? PathInfoLight.PlainPathComparer : PathInfoLight.PlainPathWithPartsCountComparer;
var existingHelpers = source.ToIndexed(
o => (PathInfoLight)$"[{o.Key}]",
o => new Ref <IHelperDescriptor <TOptions> >(o.Value),
equalityComparer
);
var target = new ObservableIndex <PathInfoLight, Ref <IHelperDescriptor <TOptions> >, IEqualityComparer <PathInfoLight> >(equalityComparer, existingHelpers);
var helpersObserver = new ObserverBuilder <ObservableEvent <IHelperDescriptor <TOptions> > >()
.OnEvent <DictionaryAddedObservableEvent <string, IHelperDescriptor <TOptions> > >(
@event =>
{
PathInfoLight key = $"[{@event.Key}]";
if (target.TryGetValue(key, out var @ref))
{
@ref.Value = @event.Value;
return;
}
target.AddOrReplace(key, new Ref <IHelperDescriptor <TOptions> >(@event.Value));
})
.Build();
source.As <ObservableIndex <string, IHelperDescriptor <TOptions>, StringEqualityComparer> >()?.Subscribe(helpersObserver);
return(target);
}
public HandlebarsConfigurationAdapter(HandlebarsConfiguration configuration)
{
UnderlingConfiguration = configuration;
AliasProviders = new ObservableList <IMemberAliasProvider>(configuration.AliasProviders);
HelperResolvers = new ObservableList <IHelperResolver>(configuration.HelperResolvers);
RegisteredTemplates = new ObservableIndex <string, HandlebarsTemplate <TextWriter, object, object>, StringEqualityComparer>(new StringEqualityComparer(StringComparison.OrdinalIgnoreCase), configuration.RegisteredTemplates);
AliasProviders = new ObservableList <IMemberAliasProvider>(configuration.AliasProviders);
FormatterProviders = new ObservableList <IFormatterProvider>
{
new DefaultFormatterProvider(),
new CollectionFormatterProvider(),
new ReadOnlyCollectionFormatterProvider()
}.AddMany(configuration.FormatterProviders);
ObjectDescriptorProviders = CreateObjectDescriptorProvider(UnderlingConfiguration.ObjectDescriptorProviders);
ExpressionMiddlewares = new ObservableList <IExpressionMiddleware>(configuration.CompileTimeConfiguration.ExpressionMiddleware)
{
new ClosureExpressionMiddleware(),
new ExpressionOptimizerMiddleware()
};
Features = UnderlingConfiguration.CompileTimeConfiguration.Features
.Select(o => o.CreateFeature())
.OrderBy(o => o.GetType().GetTypeInfo().GetCustomAttribute <FeatureOrderAttribute>()?.Order ?? 100)
.ToList();
Helpers = CreateHelpersSubscription(configuration.Helpers);
BlockHelpers = CreateHelpersSubscription(configuration.BlockHelpers);
}
public HandlebarsConfiguration()
{
var stringEqualityComparer = new StringEqualityComparer(StringComparison.OrdinalIgnoreCase);
Helpers = new ObservableIndex <string, IHelperDescriptor <HelperOptions>, StringEqualityComparer>(stringEqualityComparer);
BlockHelpers = new ObservableIndex <string, IHelperDescriptor <BlockHelperOptions>, StringEqualityComparer>(stringEqualityComparer);
RegisteredTemplates = new ObservableIndex <string, HandlebarsTemplate <TextWriter, object, object>, StringEqualityComparer>(stringEqualityComparer);
HelperResolvers = new ObservableList <IHelperResolver>();
TextEncoder = new HtmlEncoder(FormatProvider);
UnresolvedBindingFormatter = new Formatter <UndefinedBindingResult>(undef => string.Empty);
}
