From a6c02adeb6938e97aa6c78c67c0738bd5fda6bdc Mon Sep 17 00:00:00 2001
From: Fabian Guerra Soto <fabian.guerra@mapbox.com>
Date: Tue, 17 Apr 2018 18:23:35 -0400
Subject: [ios, macos] Add trigonometric support to NSExpression. (#11716)

* [ios, macos] Add acos NSExpresssion operator.

* [ios, macos] Add asin NSExpresssion operator.

* [ios, macos] Add atan NSExpresssion operator.

* [ios, macos] Add cosine NSExpresssion operator.

* [ios, macos] Add sine NSExpresssion operator.

* [ios, macos] Add tangent NSExpresssion operator.

* [ios, macos] Add log2 NSExpresssion operator.

* [ios, macos] Update style authors documentation.
---
 platform/darwin/src/NSExpression+MGLAdditions.mm | 70 ++++++++++++++++++++++++
 1 file changed, 70 insertions(+)

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

diff --git a/platform/darwin/src/NSExpression+MGLAdditions.mm b/platform/darwin/src/NSExpression+MGLAdditions.mm
index 54f98c6ab9..46a463430b 100644
--- a/platform/darwin/src/NSExpression+MGLAdditions.mm
+++ b/platform/darwin/src/NSExpression+MGLAdditions.mm
@@ -68,6 +68,13 @@ const MGLExpressionInterpolationMode MGLExpressionInterpolationModeCubicBezier =
     INSTALL_METHOD(mgl_step:from:stops:);
     INSTALL_METHOD(mgl_coalesce:);
     INSTALL_METHOD(mgl_does:have:);
+    INSTALL_METHOD(mgl_acos:);
+    INSTALL_METHOD(mgl_cos:);
+    INSTALL_METHOD(mgl_asin:);
+    INSTALL_METHOD(mgl_sin:);
+    INSTALL_METHOD(mgl_atan:);
+    INSTALL_METHOD(mgl_tan:);
+    INSTALL_METHOD(mgl_log2:);
     
     // Install functions that resemble control structures, taking arbitrary
     // numbers of arguments. Vararg aftermarket functions need to be declared
@@ -97,6 +104,55 @@ const MGLExpressionInterpolationMode MGLExpressionInterpolationModeCubicBezier =
     return @(round(number.doubleValue));
 }
 
+/**
+  Computes the principal value of the inverse cosine.
+ */
+- (NSNumber *)mgl_acos:(NSNumber *)number {
+    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.
+ */
+- (NSNumber *)mgl_asin:(NSNumber *)number {
+    return @(asin(number.doubleValue));
+}
+
+/**
+ 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 {
+    return @(atan(number.doubleValue));
+}
+
+/**
+ Computes the principal value of the tangent.
+ */
+- (NSNumber *)mgl_tan:(NSNumber *)number {
+    return @(tan(number.doubleValue));
+}
+
+/**
+ Computes the logarithm base two of the value.
+ */
+- (NSNumber *)mgl_log2:(NSNumber *)number {
+    return @(log2(number.doubleValue));
+}
+
 /**
  A placeholder for a method that evaluates an interpolation expression.
  */
@@ -675,6 +731,13 @@ NSArray *MGLSubexpressionsWithJSONObjects(NSArray *objects) {
             @"ln": @"ln:",
             @"abs": @"abs:",
             @"round": @"mgl_round:",
+            @"acos" : @"mgl_acos:",
+            @"cos" : @"mgl_cos:",
+            @"asin" : @"mgl_asin:",
+            @"sin" : @"mgl_sin:",
+            @"atan" : @"mgl_atan:",
+            @"tan" : @"mgl_tan:",
+            @"log2" : @"mgl_log2:",
             @"floor": @"floor:",
             @"ceil": @"ceiling:",
             @"^": @"raise:toPower:",
@@ -917,6 +980,13 @@ NSArray *MGLSubexpressionsWithJSONObjects(NSArray *objects) {
             @"lowercase:": @"downcase",
             @"length:": @"length",
             @"mgl_round:": @"round",
+            @"mgl_acos:" : @"acos",
+            @"mgl_cos:" : @"cos",
+            @"mgl_asin:" : @"asin",
+            @"mgl_sin:" : @"sin",
+            @"mgl_atan:" : @"atan",
+            @"mgl_tan:" : @"tan",
+            @"mgl_log2:" : @"log2",
             // Vararg aftermarket expressions need to be declared with an explicit and implicit first argument.
             @"MGL_LET": @"let",
             @"MGL_LET:": @"let",
-- 
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