From 5755129c19d96de8e6cbc0a7b96a913650635170 Mon Sep 17 00:00:00 2001
From: Valentin Shergin <shergin@fb.com>
Date: Thu, 12 Dec 2019 12:46:33 -0800
Subject: [PATCH] Fabric: Conversion function between `NSAttributedString` and
 `AttributedStringBox`

Summary:
It's nice to have those conversions between NSAttributedString and AttributedTextBox in some utils module because:
An empty string must be stored as an empty C++ string, not like an empty NSAttributedString. That allows deferring this property from the object without accessing Objective-C runtime;
It's nice to hide some tedious Objective-C object wrapping/unwrapping boilerplate.

Changelog: [Internal] Fabric-specific internal change.

Reviewed By: sammy-SC

Differential Revision: D18950430

fbshipit-source-id: 842c202f243da17c47bc5cca9df6722cdcec07c5
---
 ReactCommon/fabric/textlayoutmanager/BUCK        |  1 +
 .../platform/ios/RCTAttributedTextUtils.h        |  9 ++++++++-
 .../platform/ios/RCTAttributedTextUtils.mm       | 16 ++++++++++++++++
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/ReactCommon/fabric/textlayoutmanager/BUCK b/ReactCommon/fabric/textlayoutmanager/BUCK
index dccc6ad587a..0f2f7fa731c 100644
--- a/ReactCommon/fabric/textlayoutmanager/BUCK
+++ b/ReactCommon/fabric/textlayoutmanager/BUCK
@@ -125,6 +125,7 @@ rn_xplat_cxx_library(
         YOGA_CXX_TARGET,
         react_native_xplat_target("fabric/attributedstring:attributedstring"),
         react_native_xplat_target("fabric/core:core"),
+        react_native_xplat_target("utils:utils"),
         react_native_xplat_target("fabric/debug:debug"),
         react_native_xplat_target("fabric/graphics:graphics"),
         react_native_xplat_target("fabric/uimanager:uimanager"),
diff --git a/ReactCommon/fabric/textlayoutmanager/platform/ios/RCTAttributedTextUtils.h b/ReactCommon/fabric/textlayoutmanager/platform/ios/RCTAttributedTextUtils.h
index 406d8257d38..dd142aa3106 100644
--- a/ReactCommon/fabric/textlayoutmanager/platform/ios/RCTAttributedTextUtils.h
+++ b/ReactCommon/fabric/textlayoutmanager/platform/ios/RCTAttributedTextUtils.h
@@ -8,6 +8,7 @@
 #import <UIKit/UIKit.h>
 
 #include <react/attributedstring/AttributedString.h>
+#include <react/attributedstring/AttributedStringBox.h>
 #include <react/attributedstring/TextAttributes.h>
 
 NS_ASSUME_NONNULL_BEGIN
@@ -25,7 +26,13 @@ NSDictionary<NSAttributedStringKey, id> *RCTNSTextAttributesFromTextAttributes(
  * Conversions amond `NSAttributedString`, `AttributedString` and `AttributedStringBox`.
  */
 NSAttributedString *RCTNSAttributedStringFromAttributedString(
-    const facebook::react::AttributedString &attributedString);
+    facebook::react::AttributedString const &attributedString);
+
+NSAttributedString *RCTNSAttributedStringFromAttributedStringBox(
+    facebook::react::AttributedStringBox const &attributedStringBox);
+
+facebook::react::AttributedStringBox RCTAttributedStringBoxFromNSAttributedString(
+    NSAttributedString *nsAttributedString);
 
 @interface RCTWeakEventEmitterWrapper : NSObject
 @property (nonatomic, assign) facebook::react::SharedEventEmitter eventEmitter;
diff --git a/ReactCommon/fabric/textlayoutmanager/platform/ios/RCTAttributedTextUtils.mm b/ReactCommon/fabric/textlayoutmanager/platform/ios/RCTAttributedTextUtils.mm
index d752c3806f1..17149b70ad2 100644
--- a/ReactCommon/fabric/textlayoutmanager/platform/ios/RCTAttributedTextUtils.mm
+++ b/ReactCommon/fabric/textlayoutmanager/platform/ios/RCTAttributedTextUtils.mm
@@ -11,6 +11,7 @@
 #include <react/textlayoutmanager/RCTFontProperties.h>
 #include <react/textlayoutmanager/RCTFontUtils.h>
 #include <react/textlayoutmanager/RCTTextPrimitivesConversions.h>
+#include <react/utils/ManagedObjectWrapper.h>
 
 using namespace facebook::react;
 
@@ -268,3 +269,18 @@ NSAttributedString *RCTNSAttributedStringFromAttributedString(const AttributedSt
 
   return nsAttributedString;
 }
+
+NSAttributedString *RCTNSAttributedStringFromAttributedStringBox(AttributedStringBox const &attributedStringBox)
+{
+  switch (attributedStringBox.getMode()) {
+    case AttributedStringBox::Mode::Value:
+      return RCTNSAttributedStringFromAttributedString(attributedStringBox.getValue());
+    case AttributedStringBox::Mode::OpaquePointer:
+      return (NSAttributedString *)unwrapManagedObject(attributedStringBox.getOpaquePointer());
+  }
+}
+
+AttributedStringBox RCTAttributedStringBoxFromNSAttributedString(NSAttributedString *nsAttributedString)
+{
+  return nsAttributedString.length ? AttributedStringBox{wrapManagedObject(nsAttributedString)} : AttributedStringBox{};
+}