From dd301fbc0f9f988b47ad7b6532249833b3aa848c Mon Sep 17 00:00:00 2001
From: Fabian Guerra Soto <fabian.guerra@mapbox.com>
Date: Mon, 26 Mar 2018 12:53:34 -0400
Subject: [ios, macos] Change the format for case expressions to a flat
 structure. (#11450)

* [ios, macos] Change the format for case expressions to a flat structure.

* [ios, macos] Add support for multiple branches case expression.

* [ios, macos] Add multiple branch tests to case expressions.

* [ios, macos] Case operator now has iOS 8 support.
---
 platform/darwin/src/NSPredicate+MGLAdditions.mm | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'platform/darwin/src/NSPredicate+MGLAdditions.mm')

diff --git a/platform/darwin/src/NSPredicate+MGLAdditions.mm b/platform/darwin/src/NSPredicate+MGLAdditions.mm
index 63c8307803..2d5b646ff2 100644
--- a/platform/darwin/src/NSPredicate+MGLAdditions.mm
+++ b/platform/darwin/src/NSPredicate+MGLAdditions.mm
@@ -324,4 +324,29 @@ NSArray *MGLSubpredicatesWithJSONObjects(NSArray *objects) {
     return nil;
 }
 
+- (id)mgl_case:(id)firstValue, ... {
+
+    if ([self evaluateWithObject:nil]) {
+        return firstValue;
+    }
+    
+    id eachExpression;
+    va_list argumentList;
+    va_start(argumentList, firstValue);
+    
+    while ((eachExpression = va_arg(argumentList, id))) {
+        if ([eachExpression isKindOfClass:[NSComparisonPredicate class]]) {
+            id valueExpression = va_arg(argumentList, id);
+            if ([eachExpression evaluateWithObject:nil]) {
+                return valueExpression;
+            }
+        } else {
+            return eachExpression;
+        }
+    }
+    va_end(argumentList);
+    
+    return nil;
+}
+
 @end
-- 
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