[android, ios, macos] Generate symbol-placement: line-center wrappers

1 files changed, 34 insertions, 20 deletions

diff --git a/platform/darwin/src/MGLSymbolStyleLayer.h b/platform/darwin/src/MGLSymbolStyleLayer.h
index 2c899fe76f..afaea9a74f 100644
--- a/platform/darwin/src/MGLSymbolStyleLayer.h
+++ b/platform/darwin/src/MGLSymbolStyleLayer.h
@@ -83,8 +83,8 @@ typedef NS_ENUM(NSUInteger, MGLIconPitchAlignment) {
 typedef NS_ENUM(NSUInteger, MGLIconRotationAlignment) {
     /**
      When `symbolPlacement` is set to `MGLSymbolPlacementPoint`, aligns icons
-     east-west. When `symbolPlacement` is set to `MGLSymbolPlacementLine`,
-     aligns icon x-axes with the line.
+     east-west. When `symbolPlacement` is set to `MGLSymbolPlacementLine` or
+     `MGLSymbolPlacementLineCenter`, aligns icon x-axes with the line.
      */
     MGLIconRotationAlignmentMap,
     /**
@@ -95,8 +95,8 @@ typedef NS_ENUM(NSUInteger, MGLIconRotationAlignment) {
     /**
      When `symbolPlacement` is set to `MGLSymbolPlacementPoint`, this is
      equivalent to `MGLIconRotationAlignmentViewport`. When `symbolPlacement` is
-     set to `MGLSymbolPlacementLine`, this is equivalent to
-     `MGLIconRotationAlignmentMap`.
+     set to `MGLSymbolPlacementLine` or `MGLSymbolPlacementLineCenter`, this is
+     equivalent to `MGLIconRotationAlignmentMap`.
      */
     MGLIconRotationAlignmentAuto,
 };
@@ -142,6 +142,12 @@ typedef NS_ENUM(NSUInteger, MGLSymbolPlacement) {
      `LineString` and `Polygon` geometries.
      */
     MGLSymbolPlacementLine,
+    /**
+     The label is placed at the center of the line of the geometry. Can only be
+     used on `LineString` and `Polygon` geometries. Note that a single feature
+     in a vector tile may contain multiple line geometries.
+     */
+    MGLSymbolPlacementLineCenter,
 };
 
 /**
@@ -242,8 +248,8 @@ typedef NS_ENUM(NSUInteger, MGLTextPitchAlignment) {
 typedef NS_ENUM(NSUInteger, MGLTextRotationAlignment) {
     /**
      When `symbolPlacement` is set to `MGLSymbolPlacementPoint`, aligns text
-     east-west. When `symbolPlacement` is set to `MGLSymbolPlacementLine`,
-     aligns text x-axes with the line.
+     east-west. When `symbolPlacement` is set to `MGLSymbolPlacementLine` or
+     `MGLSymbolPlacementLineCenter`, aligns text x-axes with the line.
      */
     MGLTextRotationAlignmentMap,
     /**
@@ -254,8 +260,8 @@ typedef NS_ENUM(NSUInteger, MGLTextRotationAlignment) {
     /**
      When `symbolPlacement` is set to `MGLSymbolPlacementPoint`, this is
      equivalent to `MGLTextRotationAlignmentViewport`. When `symbolPlacement` is
-     set to `MGLSymbolPlacementLine`, this is equivalent to
-     `MGLTextRotationAlignmentMap`.
+     set to `MGLSymbolPlacementLine` or `MGLSymbolPlacementLineCenter`, this is
+     equivalent to `MGLTextRotationAlignmentMap`.
      */
     MGLTextRotationAlignmentAuto,
 };
@@ -653,12 +659,13 @@ MGL_EXPORT
  * Constant `MGLIconRotationAlignment` values
  * Any of the following constant string values:
    * `map`: When `symbol-placement` is set to `point`, aligns icons east-west.
- When `symbol-placement` is set to `line`, aligns icon x-axes with the line.
+ When `symbol-placement` is set to `line` or `line-center`, aligns icon x-axes
+ with the line.
    * `viewport`: Produces icons whose x-axes are aligned with the x-axis of the
  viewport, regardless of the value of `symbol-placement`.
    * `auto`: When `symbol-placement` is set to `point`, this is equivalent to
- `viewport`. When `symbol-placement` is set to `line`, this is equivalent to
- `map`.
+ `viewport`. When `symbol-placement` is set to `line` or `line-center`, this is
+ equivalent to `map`.
  * Predefined functions, including mathematical and string operators
  * Conditional expressions
  * Variable assignments and references to assigned variables
@@ -795,8 +802,9 @@ MGL_EXPORT
  
  This property is only applied to the style if `iconImageName` is non-`nil`, and
  `iconRotationAlignment` is set to an expression that evaluates to `map`, and
- `symbolPlacement` is set to an expression that evaluates to `line`. Otherwise,
- it is ignored.
+ `symbolPlacement` is set to an expression that evaluates to either
+ `MGLSymbolPlacementLine` or `MGLSymbolPlacementLineCenter`. Otherwise, it is
+ ignored.
  
  This attribute corresponds to the <a
  href="https://www.mapbox.com/mapbox-gl-style-spec/#layout-symbol-icon-keep-upright"><code>icon-keep-upright</code></a>
@@ -828,8 +836,9 @@ MGL_EXPORT
  
  This property is only applied to the style if `text` is non-`nil`, and
  `textRotationAlignment` is set to an expression that evaluates to `map`, and
- `symbolPlacement` is set to an expression that evaluates to `line`. Otherwise,
- it is ignored.
+ `symbolPlacement` is set to an expression that evaluates to either
+ `MGLSymbolPlacementLine` or `MGLSymbolPlacementLineCenter`. Otherwise, it is
+ ignored.
  
  This attribute corresponds to the <a
  href="https://www.mapbox.com/mapbox-gl-style-spec/#layout-symbol-text-keep-upright"><code>text-keep-upright</code></a>
@@ -861,8 +870,9 @@ MGL_EXPORT
  `45`. Set this property to `nil` to reset it to the default value.
  
  This property is only applied to the style if `text` is non-`nil`, and
- `symbolPlacement` is set to an expression that evaluates to `line`. Otherwise,
- it is ignored.
+ `symbolPlacement` is set to an expression that evaluates to either
+ `MGLSymbolPlacementLine` or `MGLSymbolPlacementLineCenter`. Otherwise, it is
+ ignored.
  
  This attribute corresponds to the <a
  href="https://www.mapbox.com/mapbox-gl-style-spec/#layout-symbol-text-max-angle"><code>text-max-angle</code></a>
@@ -956,6 +966,9 @@ MGL_EXPORT
    * `point`: The label is placed at the point where the geometry is located.
    * `line`: The label is placed along the line of the geometry. Can only be
  used on `LineString` and `Polygon` geometries.
+   * `line-center`: The label is placed at the center of the line of the
+ geometry. Can only be used on `LineString` and `Polygon` geometries. Note that
+ a single feature in a vector tile may contain multiple line geometries.
  * Predefined functions, including mathematical and string operators
  * Conditional expressions
  * Variable assignments and references to assigned variables
@@ -1427,12 +1440,13 @@ MGL_EXPORT
  * Constant `MGLTextRotationAlignment` values
  * Any of the following constant string values:
    * `map`: When `symbol-placement` is set to `point`, aligns text east-west.
- When `symbol-placement` is set to `line`, aligns text x-axes with the line.
+ When `symbol-placement` is set to `line` or `line-center`, aligns text x-axes
+ with the line.
    * `viewport`: Produces glyphs whose x-axes are aligned with the x-axis of the
  viewport, regardless of the value of `symbol-placement`.
    * `auto`: When `symbol-placement` is set to `point`, this is equivalent to
- `viewport`. When `symbol-placement` is set to `line`, this is equivalent to
- `map`.
+ `viewport`. When `symbol-placement` is set to `line` or `line-center`, this is
+ equivalent to `map`.
  * Predefined functions, including mathematical and string operators
  * Conditional expressions
  * Variable assignments and references to assigned variables