1 files changed, 53 insertions, 0 deletions
diff --git a/platform/darwin/src/MGLShapeSource.mm b/platform/darwin/src/MGLShapeSource.mm
index 3628a0eb74..3820fe9d60 100644
--- a/platform/darwin/src/MGLShapeSource.mm
+++ b/platform/darwin/src/MGLShapeSource.mm
@@ -3,6 +3,7 @@
 
 #import "MGLLoggingConfiguration_Private.h"
 #import "MGLStyle_Private.h"
+#import "MGLStyleValue_Private.h"
 #import "MGLMapView_Private.h"
 #import "MGLSource_Private.h"
 #import "MGLFeature_Private.h"
@@ -19,6 +20,7 @@
 const MGLShapeSourceOption MGLShapeSourceOptionBuffer = @"MGLShapeSourceOptionBuffer";
 const MGLShapeSourceOption MGLShapeSourceOptionClusterRadius = @"MGLShapeSourceOptionClusterRadius";
 const MGLShapeSourceOption MGLShapeSourceOptionClustered = @"MGLShapeSourceOptionClustered";
+const MGLShapeSourceOption MGLShapeSourceOptionClusterProperties = @"MGLShapeSourceOptionClusterProperties";
 const MGLShapeSourceOption MGLShapeSourceOptionMaximumZoomLevel = @"MGLShapeSourceOptionMaximumZoomLevel";
 const MGLShapeSourceOption MGLShapeSourceOptionMaximumZoomLevelForClustering = @"MGLShapeSourceOptionMaximumZoomLevelForClustering";
 const MGLShapeSourceOption MGLShapeSourceOptionMinimumZoomLevel = @"MGLShapeSourceOptionMinimumZoomLevel";
@@ -84,6 +86,57 @@ mbgl::style::GeoJSONOptions MGLGeoJSONOptionsFromDictionary(NSDictionary<MGLShap
         geoJSONOptions.cluster = value.boolValue;
     }
 
+    if (NSDictionary *value = options[MGLShapeSourceOptionClusterProperties]) {
+        if (![value isKindOfClass:[NSDictionary<NSString *, NSArray *> class]]) {
+            [NSException raise:NSInvalidArgumentException
+                        format:@"MGLShapeSourceOptionClusterProperties must be an NSDictionary with an NSString as a key and an array containing two NSExpression objects as a value."];
+        }
+
+        NSEnumerator *stringEnumerator = [value keyEnumerator];
+        NSString *key;
+
+        while (key = [stringEnumerator nextObject]) {
+            NSArray *expressionsArray = value[key];
+            if (![expressionsArray isKindOfClass:[NSArray class]]) {
+                [NSException raise:NSInvalidArgumentException
+                            format:@"MGLShapeSourceOptionClusterProperties dictionary member value must be an array containing two objects."];
+            }
+            // Check that the array has 2 values. One should be a the reduce expression and one should be the map expression.
+            if ([expressionsArray count] != 2) {
+                [NSException raise:NSInvalidArgumentException
+                            format:@"MGLShapeSourceOptionClusterProperties member value requires array of two objects."];
+            }
+
+            // reduceExpression should be a valid NSExpression
+            NSExpression *reduceExpression = expressionsArray[0];
+            if (![reduceExpression isKindOfClass:[NSExpression class]]) {
+                [NSException raise:NSInvalidArgumentException
+                format:@"MGLShapeSourceOptionClusterProperties array value requires two expression objects."];
+            }
+            auto reduce = MGLClusterPropertyFromNSExpression(reduceExpression);
+            if (!reduce) {
+                [NSException raise:NSInvalidArgumentException
+                            format:@"Failed to convert MGLShapeSourceOptionClusterProperties reduce expression."];
+            }
+
+            // mapExpression should be a valid NSExpression
+            NSExpression *mapExpression = expressionsArray[1];
+            if (![mapExpression isKindOfClass:[NSExpression class]]) {
+                [NSException raise:NSInvalidArgumentException
+                            format:@"MGLShapeSourceOptionClusterProperties member value must contain a valid NSExpression."];
+            }
+            auto map = MGLClusterPropertyFromNSExpression(mapExpression);
+            if (!map) {
+                [NSException raise:NSInvalidArgumentException
+                            format:@"Failed to convert MGLShapeSourceOptionClusterProperties map expression."];
+            }
+
+            std::string keyString = std::string([key UTF8String]);
+
+            geoJSONOptions.clusterProperties.emplace(keyString, std::make_pair(std::move(map), std::move(reduce)));
+        }
+    }
+
     if (NSNumber *value = options[MGLShapeSourceOptionLineDistanceMetrics]) {
         if (![value isKindOfClass:[NSNumber class]]) {
             [NSException raise:NSInvalidArgumentException