[ios, macos] Minimal darwin wrappers of 'format' expression

Add support for `MGL_FUNCTION('format', <text>, <options dictionary>)`

1 files changed, 5 insertions, 0 deletions

diff --git a/platform/darwin/src/NSExpression+MGLAdditions.mm b/platform/darwin/src/NSExpression+MGLAdditions.mm
index 58f5816416..1a8dff060c 100644
--- a/platform/darwin/src/NSExpression+MGLAdditions.mm
+++ b/platform/darwin/src/NSExpression+MGLAdditions.mm
@@ -1111,6 +1111,11 @@ NSArray *MGLSubexpressionsWithJSONObjects(NSArray *objects) {
                     // Avoid wrapping collator options object in literal expression.
                     return @[@"collator", self.arguments[1].constantValue];
                 }
+                if (op.expressionType == NSConstantValueExpressionType
+                    && [op.constantValue isEqualToString:@"format"]) {
+                    // Avoid wrapping format options object in literal expression.
+                    return @[@"format", self.arguments[1].mgl_jsonExpressionObject, self.arguments[2].constantValue];
+                }
                 return self.arguments.mgl_jsonExpressionObject;
             } else if (op == [MGLColor class] && [function isEqualToString:@"colorWithRed:green:blue:alpha:"]) {
                 NSArray *arguments = self.arguments.mgl_jsonExpressionObject;