[ios, macos] Add sine NSExpresssion operator.

2 files changed, 17 insertions, 0 deletions

diff --git a/platform/darwin/src/NSExpression+MGLAdditions.mm b/platform/darwin/src/NSExpression+MGLAdditions.mm
index aa01fd6126..8c79fd43f8 100644
--- a/platform/darwin/src/NSExpression+MGLAdditions.mm
+++ b/platform/darwin/src/NSExpression+MGLAdditions.mm
@@ -71,6 +71,7 @@ const MGLExpressionInterpolationMode MGLExpressionInterpolationModeCubicBezier =
     INSTALL_METHOD(mgl_acos:);
     INSTALL_METHOD(mgl_cos:);
     INSTALL_METHOD(mgl_asin:);
+    INSTALL_METHOD(mgl_sin:);
     INSTALL_METHOD(mgl_atan:);
     
     // Install functions that resemble control structures, taking arbitrary
@@ -123,6 +124,13 @@ const MGLExpressionInterpolationMode MGLExpressionInterpolationModeCubicBezier =
 }
 
 /**
+ Computes the principal value of the sine.
+ */
+- (NSNumber *)mgl_sin:(NSNumber *)number {
+    return @(sin(number.doubleValue));
+}
+
+/**
  Computes the principal value of the inverse tangent.
  */
 - (NSNumber *)mgl_atan:(NSNumber *)number {
@@ -710,6 +718,7 @@ NSArray *MGLSubexpressionsWithJSONObjects(NSArray *objects) {
             @"acos" : @"mgl_acos:",
             @"cos" : @"mgl_cos:",
             @"asin" : @"mgl_asin:",
+            @"sin" : @"mgl_sin:",
             @"atan" : @"mgl_atan:",
             @"floor": @"floor:",
             @"ceil": @"ceiling:",
@@ -956,6 +965,7 @@ NSArray *MGLSubexpressionsWithJSONObjects(NSArray *objects) {
             @"mgl_acos:" : @"acos",
             @"mgl_cos:" : @"cos",
             @"mgl_asin:" : @"asin",
+            @"mgl_sin:" : @"sin",
             @"mgl_atan:" : @"atan",
             // Vararg aftermarket expressions need to be declared with an explicit and implicit first argument.
             @"MGL_LET": @"let",
diff --git a/platform/darwin/test/MGLExpressionTests.mm b/platform/darwin/test/MGLExpressionTests.mm
index badc9904cc..4e18ad694d 100644
--- a/platform/darwin/test/MGLExpressionTests.mm
+++ b/platform/darwin/test/MGLExpressionTests.mm
@@ -553,6 +553,13 @@ using namespace std::string_literals;
         XCTAssertEqualObjects([NSExpression expressionWithMGLJSONObject:jsonExpression], expression);
     }
     {
+        NSExpression *expression = [NSExpression expressionForFunction:@"mgl_sin:" arguments:@[MGLConstantExpression(@0)]];
+        NSArray *jsonExpression = @[@"sin", @0];
+        XCTAssertEqualObjects(expression.mgl_jsonExpressionObject, jsonExpression);
+        XCTAssertEqualObjects([expression expressionValueWithObject:nil context:nil], @0);
+        XCTAssertEqualObjects([NSExpression expressionWithMGLJSONObject:jsonExpression], expression);
+    }
+    {
         NSExpression *expression = [NSExpression expressionForFunction:@"mgl_atan:" arguments:@[MGLConstantExpression(@20)]];
         NSArray *jsonExpression = @[@"atan", @20];
         XCTAssertEqualObjects(expression.mgl_jsonExpressionObject, jsonExpression);