NSItemProvider skeleton implementation.

Source/NSItemProvider.m

@@ -26,5 +26,149 @@
 
 @implementation NSItemProvider
 
+- (instancetype) init
+{
+  return nil;
+}
+
+- (void) registerDataRepresentationForTypeIdentifier: (NSString *)typeIdentifier
+                                          visibility: (NSItemProviderRepresentationVisibility)visibility
+                                         loadHandler: (GSProgressHandler)loadHandler
+{
+}
+
+- (void) registerFileRepresentationForTypeIdentifier: (NSString *)typeIdentifier
+                                         fileOptions: (NSItemProviderFileOptions)fileOptions
+                                          visibility: (NSItemProviderRepresentationVisibility)visibility
+                                         loadHandler: (GSProgressURLBOOLHandler)loadHandler
+{
+}
+
+- (NSArray *) registeredTypeIdentifiers
+{
+  return nil;
+}
+
+- (NSArray *) registeredTypeIdentifiersWithFileOptions: (NSItemProviderFileOptions)fileOptions
+{
+  return nil;
+}
+
+- (BOOL) hasItemConformingToTypeIdentifier: (NSString *)typeIdentifier
+{
+  return NO;
+}
+
+- (BOOL) hasRepresentationConformingToTypeIdentifier: (NSString *)typeIdentifier
+                                         fileOptions: (NSItemProviderFileOptions)fileOptions
+{
+  return NO;
+}
+
+- (NSProgress *) loadDataRepresentationForTypeIdentifier: (NSString *)typeIdentifier
+                                       completionHandler: (GSProviderCompletionHandler)completionHandler
+{
+  return nil;
+}
+
+- (NSProgress *) loadFileRepresentationForTypeIdentifier: (NSString *)typeIdentifier
+                                       completionHandler: (GSProviderURLCompletionHandler)completionHandler
+{
+  return nil;
+}
+
+- (NSProgress *) loadInPlaceFileRepresentationForTypeIdentifier: (NSString *)typeIdentifier
+                                              completionHandler: (GSProviderURLBOOLCompletionHandler)completionHandler
+{
+  return nil;
+}
+
+- (NSString *) suggestedName
+{
+  return nil;
+}
+
+- (void) setSuggestedName: (NSString *)suggestedName
+{
+}
+
+- (instancetype) initWithObject: (id<NSItemProviderWriting>)object
+{
+  return nil;
+}
+
+- (void) registerObject: (id<NSItemProviderWriting>)object visibility: (NSItemProviderRepresentationVisibility)visibility
+{
+}
+
+- (void) registerObjectOfClass: (Class<NSItemProviderWriting>)aClass  // NSItemProviderWriting conforming class...
+                    visibility: (NSItemProviderRepresentationVisibility)visibility
+                   loadHandler: (GSItemProviderWritingHandler)loadHandler
+{
+}
+
+- (BOOL) canLoadObjectOfClass: (Class<NSItemProviderReading>)aClass
+{
+  return NO;
+}
+
+- (NSProgress *) loadObjectOfClass: (Class<NSItemProviderReading>)aClass // NSItemProviderReading conforming class...
+                 completionHandler: (GSItemProviderReadingHandler)completionHandler
+{
+  return nil;
+}
+
+- (instancetype) initWithItem: (id<NSSecureCoding>)item typeIdentifier: (NSString *)typeIdentifier // designated init
+{
+  return nil;
+}
+
+- (instancetype) initWithContentsOfURL: (NSURL *)fileURL
+{
+  return nil;
+}
+
+- (void) registerItemForTypeIdentifier: (NSString *)typeIdentifier loadHandler: (NSItemProviderLoadHandler)loadHandler
+{
+}
+
+- (void)loadItemForTypeIdentifier: (NSString *)typeIdentifier
+                          options: (NSDictionary *)options
+                completionHandler: (NSItemProviderCompletionHandler)completionHandler
+{
+}
+
+- (instancetype) copyWithZone: (NSZone*)zone
+{
+  return nil;
+}
 @end
 
+// Preview support
+NSString * const NSItemProviderPreferredImageSizeKey = @"NSItemProviderPreferredImageSizeKey";
+
+@implementation NSItemProvider (NSPreviewSupport)
+
+- (NSItemProviderLoadHandler) previewImageHandler
+{
+  return nil;
+}
+
+- (void) setPreviewImageHandler: (NSItemProviderLoadHandler) previewImageHandler
+{
+}
+  
+- (void) loadPreviewImageWithOptions: (NSDictionary *)options
+                   completionHandler: (NSItemProviderCompletionHandler)completionHandler
+{
+}
+
+@end
+
+NSString * const NSExtensionJavaScriptPreprocessingResultsKey = @"NSExtensionJavaScriptPreprocessingResultsKey"; 
+
+NSString * const NSExtensionJavaScriptFinalizeArgumentKey = @"NSExtensionJavaScriptFinalizeArgumentKey";
+
+NSString * const NSItemProviderErrorDomain = @"NSItemProviderErrorDomain" ;
+
+