1 files changed, 61 insertions, 0 deletions
diff --git a/platform/darwin/src/MGLStyleAttributeFunction_Private.h b/platform/darwin/src/MGLStyleAttributeFunction_Private.h
new file mode 100644
index 0000000000..a75e17483d
--- /dev/null
+++ b/platform/darwin/src/MGLStyleAttributeFunction_Private.h
@@ -0,0 +1,61 @@
+#import "MGLStyleAttributeFunction.h"
+
+#include <mbgl/util/color.hpp>
+#include <mbgl/style/function.hpp>
+#include <mbgl/style/property_value.hpp>
+
+#define MGLSetEnumProperty(name, Name, MBGLType, ObjCType) \
+    if (name.isFunction) { \
+        NSAssert([name isKindOfClass:[MGLStyleAttributeFunction class]], @"" #name @" should be a function"); \
+        \
+        __block std::vector<std::pair<float, mbgl::style::MBGLType>> stops; \
+        [[(MGLStyleAttributeFunction *)name stops] enumerateKeysAndObjectsUsingBlock:^(NSNumber * _Nonnull key, NSValue * _Nonnull obj, BOOL * _Nonnull stop) { \
+            NSAssert([obj isKindOfClass:[NSValue class]], @"Stops in " #name @" should be NSValues"); \
+            ObjCType value; \
+            [obj getValue:&value]; \
+            stops.emplace_back(key.floatValue, static_cast<mbgl::style::MBGLType>(value)); \
+        }]; \
+        auto function = mbgl::style::Function<mbgl::style::MBGLType> { \
+            stops, \
+            [(MGLStyleAttributeFunction *)name base].floatValue, \
+        }; \
+        self.layer->set##Name(function); \
+    } else { \
+        NSAssert([name isKindOfClass:[NSValue class]], @"" #name @"should be an NSValue"); \
+        ObjCType value; \
+        [(NSValue *)name getValue:&value]; \
+        self.layer->set##Name({ static_cast<mbgl::style::MBGLType>(value) }); \
+    }
+
+#define MGLGetEnumProperty(Name, MBGLType, ObjCType) \
+    const char *type = @encode(ObjCType); \
+    mbgl::style::PropertyValue<mbgl::style::MBGLType> property = self.layer->get##Name(); \
+    if (property.isConstant()) { \
+        return [NSValue value:&property.asConstant() withObjCType:type]; \
+    } else if (property.isFunction()) { \
+        return nil; \
+    } else { \
+        return nil; \
+    }
+
+@interface MGLStyleAttributeFunction(Private)
+
++ (instancetype)functionWithColorPropertyValue:(mbgl::style::Function<mbgl::Color>)property;
+
++ (instancetype)functionWithNumberPropertyValue:(mbgl::style::Function<float>)property;
+
++ (instancetype)functionWithBoolPropertyValue:(mbgl::style::Function<bool>)property;
+
++ (instancetype)functionWithStringPropertyValue:(mbgl::style::Function<std::string>)property;
+
++ (instancetype)functionWithOffsetPropertyValue:(mbgl::style::Function<std::array<float, 2>>)property;
+
++ (instancetype)functionWithPaddingPropertyValue:(mbgl::style::Function<std::array<float, 4>>)property;
+
++ (instancetype)functionWithStringArrayPropertyValue:(mbgl::style::Function<std::vector<std::string>>)property;
+
++ (instancetype)functionWithNumberArrayPropertyValue:(mbgl::style::Function<std::vector<float>>)property;
+
++ (instancetype)functionWithEnumProperyValue:(mbgl::style::Function<bool>)property type:(const char *)type;
+
+@end;