1 files changed, 79 insertions, 0 deletions
diff --git a/platform/darwin/src/NSExpression+MGLPrivateAdditions.h b/platform/darwin/src/NSExpression+MGLPrivateAdditions.h
new file mode 100644
index 0000000000..8d1b4d6af5
--- /dev/null
+++ b/platform/darwin/src/NSExpression+MGLPrivateAdditions.h
@@ -0,0 +1,79 @@
+#import <Foundation/Foundation.h>
+#if TARGET_OS_IPHONE
+    #import <UIKit/UIKit.h>
+#else
+    #import <Cocoa/Cocoa.h>
+#endif
+
+#import "NSExpression+MGLAdditions.h"
+
+#include <mbgl/style/filter.hpp>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface NSObject (MGLExpressionAdditions)
+
+- (NSNumber *)mgl_number;
+- (NSNumber *)mgl_numberWithFallbackValues:(id)fallbackValue, ... NS_REQUIRES_NIL_TERMINATION;
+
+@end
+
+@interface NSExpression (MGLPrivateAdditions)
+
+@property (nonatomic, readonly) mbgl::Value mgl_constantMBGLValue;
+@property (nonatomic, readonly) std::vector<mbgl::Value> mgl_aggregateMBGLValue;
+@property (nonatomic, readonly) mbgl::FeatureType mgl_featureType;
+@property (nonatomic, readonly) std::vector<mbgl::FeatureType> mgl_aggregateFeatureType;
+@property (nonatomic, readonly) mbgl::FeatureIdentifier mgl_featureIdentifier;
+@property (nonatomic, readonly) std::vector<mbgl::FeatureIdentifier> mgl_aggregateFeatureIdentifier;
+
+@end
+
+@interface NSNull (MGLExpressionAdditions)
+
+@property (nonatomic, readonly) id mgl_jsonExpressionObject;
+
+@end
+
+@interface NSString (MGLExpressionAdditions)
+
+@property (nonatomic, readonly) id mgl_jsonExpressionObject;
+
+@end
+
+@interface NSNumber (MGLExpressionAdditions)
+
+- (id)mgl_interpolateWithCurveType:(NSString *)curveType parameters:(NSArray *)parameters stops:(NSDictionary<NSNumber *, id> *)stops;
+- (id)mgl_stepWithMinimum:(id)minimum stops:(NSDictionary<NSNumber *, id> *)stops;
+
+@property (nonatomic, readonly) id mgl_jsonExpressionObject;
+
+@end
+
+@interface NSArray (MGLExpressionAdditions)
+
+@property (nonatomic, readonly) id mgl_jsonExpressionObject;
+
+@end
+
+@interface NSDictionary (MGLExpressionAdditions)
+
+@property (nonatomic, readonly) id mgl_jsonExpressionObject;
+
+@end
+
+@interface MGLColor (MGLExpressionAdditions)
+
+@property (nonatomic, readonly) id mgl_jsonExpressionObject;
+
+@end
+
+@interface NSExpression (MGLExpressionAdditions)
+
+- (NSExpression *)mgl_expressionWithContext:(NSDictionary<NSString *, NSExpression *> *)context;
+
+@end
+
+extern NSArray *MGLSubexpressionsWithJSONObjects(NSArray *objects);
+
+NS_ASSUME_NONNULL_END