From 5e0c4af7b25c1dd1e008b706e8a8ce1b84f09c02 Mon Sep 17 00:00:00 2001
From: Fabian Guerra <fabian.guerra@mapbox.com>
Date: Tue, 17 Apr 2018 16:07:51 -0400
Subject: [ios, macos] Add cosine NSExpresssion operator.

---
 platform/darwin/src/NSExpression+MGLAdditions.mm | 10 ++++++++++
 platform/darwin/test/MGLExpressionTests.mm       |  7 +++++++
 2 files changed, 17 insertions(+)

diff --git a/platform/darwin/src/NSExpression+MGLAdditions.mm b/platform/darwin/src/NSExpression+MGLAdditions.mm
index d23da18597..aa01fd6126 100644
--- a/platform/darwin/src/NSExpression+MGLAdditions.mm
+++ b/platform/darwin/src/NSExpression+MGLAdditions.mm
@@ -69,6 +69,7 @@ const MGLExpressionInterpolationMode MGLExpressionInterpolationModeCubicBezier =
     INSTALL_METHOD(mgl_coalesce:);
     INSTALL_METHOD(mgl_does:have:);
     INSTALL_METHOD(mgl_acos:);
+    INSTALL_METHOD(mgl_cos:);
     INSTALL_METHOD(mgl_asin:);
     INSTALL_METHOD(mgl_atan:);
     
@@ -107,6 +108,13 @@ const MGLExpressionInterpolationMode MGLExpressionInterpolationModeCubicBezier =
     return @(acos(number.doubleValue));
 }
 
+/**
+ Computes the principal value of the cosine.
+ */
+- (NSNumber *)mgl_cos:(NSNumber *)number {
+    return @(cos(number.doubleValue));
+}
+
 /**
  Computes the principal value of the inverse sine.
  */
@@ -700,6 +708,7 @@ NSArray *MGLSubexpressionsWithJSONObjects(NSArray *objects) {
             @"abs": @"abs:",
             @"round": @"mgl_round:",
             @"acos" : @"mgl_acos:",
+            @"cos" : @"mgl_cos:",
             @"asin" : @"mgl_asin:",
             @"atan" : @"mgl_atan:",
             @"floor": @"floor:",
@@ -945,6 +954,7 @@ NSArray *MGLSubexpressionsWithJSONObjects(NSArray *objects) {
             @"length:": @"length",
             @"mgl_round:": @"round",
             @"mgl_acos:" : @"acos",
+            @"mgl_cos:" : @"cos",
             @"mgl_asin:" : @"asin",
             @"mgl_atan:" : @"atan",
             // Vararg aftermarket expressions need to be declared with an explicit and implicit first argument.
diff --git a/platform/darwin/test/MGLExpressionTests.mm b/platform/darwin/test/MGLExpressionTests.mm
index 20e252c06b..badc9904cc 100644
--- a/platform/darwin/test/MGLExpressionTests.mm
+++ b/platform/darwin/test/MGLExpressionTests.mm
@@ -538,6 +538,13 @@ using namespace std::string_literals;
         XCTAssertEqualObjects([expression expressionValueWithObject:nil context:nil], @0);
         XCTAssertEqualObjects([NSExpression expressionWithMGLJSONObject:jsonExpression], expression);
     }
+    {
+        NSExpression *expression = [NSExpression expressionForFunction:@"mgl_cos:" arguments:@[MGLConstantExpression(@0)]];
+        NSArray *jsonExpression = @[@"cos", @0];
+        XCTAssertEqualObjects(expression.mgl_jsonExpressionObject, jsonExpression);
+        XCTAssertEqualObjects([expression expressionValueWithObject:nil context:nil], @1);
+        XCTAssertEqualObjects([NSExpression expressionWithMGLJSONObject:jsonExpression], expression);
+    }
     {
         NSExpression *expression = [NSExpression expressionForFunction:@"mgl_asin:" arguments:@[MGLConstantExpression(@0)]];
         NSArray *jsonExpression = @[@"asin", @0];
-- 
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