Install aftermarket expression functions (#11472)

* [ios, macos] Introduced more ergonomic expression concatenation syntax

* [ios, macos] Fixed mgl_join:

* [ios, macos] Simplified expression document headings

* [ios, macos] Documented mgl_join:

* [ios, macos] Convert length operator to length: for strings

Only works for literal strings.

* [ios, macos] Implemented type conversion using CAST()

* [ios, macos] Aftermarket let expressions

* [ios, macos] Refactored aftermarket expression functions

Refactored the installation of aftermarket expression functions to use macros. It is no longer necessary to handwrite the type encoding of a function. Also added aftermarket functions for interpolating and stepping.

* [ios, macos] Updated documentation, tests, demo apps

* [ios, macos] Added generic expression function

* [ios, macos] Add MGL_MATCH function placeholder.

* [ios, macos] Add MGL_SWITCH expression operator.

* [ios, macos] Add mgl_coalesce: as expression function.

* [ios, macos] Update style documentation.

* [ios, macos] Add conventional custom function support.

* [ios, macos] Updated example code

* [ios, macos] Add mgl_coalesce conventional custom function support.

* [ios, macos] Add aftermarket function to 'has' operator.

* [ios, macos] Add documentation for lookup and feature operators.

* [ios, macos] Documented simple lookup

* [ios, macos] Renamed, reversed has expression

Renamed mgl_hasProperty:properties: to mgl_does:have: for better readability and consistency with the conventional mgl_has: function. Documented both forms of mgl_has:.

* [ios, macos] Restored OEM conditionals where available

This is the preferred syntax for simple conditionals on iOS 9 and above, because you can inline the predicate instead of wrapping it in a constant value expression, which means you can write a conditional in a single format string.

* [ios, macos] Update style docs.

Co-authored-by: Fabian Guerra <fabian.guerra@mapbox.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/platform/macos/app/MapDocument.m b/platform/macos/app/MapDocument.m
index 23bc652229..4d6c71584b 100644
--- a/platform/macos/app/MapDocument.m
+++ b/platform/macos/app/MapDocument.m
@@ -894,7 +894,7 @@ NS_ARRAY_OF(id <MGLAnnotation>) *MBXFlattenedShapes(NS_ARRAY_OF(id <MGLAnnotatio
     self.mapView.style.transition = transition;
 
     MGLStyleLayer *waterLayer = [self.mapView.style layerWithIdentifier:@"water"];
-    NSExpression *colorExpression = [NSExpression expressionWithFormat:@"FUNCTION($zoomLevel, 'mgl_interpolateWithCurveType:parameters:stops:', 'linear', nil, %@)", @{
+    NSExpression *colorExpression = [NSExpression expressionWithFormat:@"mgl_interpolate:withCurveType:parameters:stops:($zoomLevel, 'linear', nil, %@)", @{
         @0.0: [NSColor redColor],
         @10.0: [NSColor yellowColor],
         @20.0: [NSColor blackColor],
@@ -927,7 +927,7 @@ NS_ARRAY_OF(id <MGLAnnotation>) *MBXFlattenedShapes(NS_ARRAY_OF(id <MGLAnnotatio
         theaterLayer.predicate = [NSPredicate predicateWithFormat:@"maki == 'theatre'"];
         theaterLayer.iconImageName = [NSExpression expressionForConstantValue:NSImageNameIChatTheaterTemplate];
         theaterLayer.iconScale = [NSExpression expressionForConstantValue:@2];
-        theaterLayer.iconColor = [NSExpression expressionWithFormat:@"FUNCTION($zoomLevel, 'mgl_interpolateWithCurveType:parameters:stops:', 'linear', nil, %@)", @{
+        theaterLayer.iconColor = [NSExpression expressionWithFormat:@"mgl_interpolate:withCurveType:parameters:stops:($zoomLevel, 'linear', nil, %@)", @{
             @16.0: [NSColor redColor],
             @18.0: [NSColor yellowColor],
             @20.0: [NSColor blackColor],