Fabric: Introducing AttributedString::Range

Summary:
We need this type to work with string ranges (e.g. working with selection ranges). This diff implements parsing and printing that as well.

Changelog: [Internal] Fabric-specific internal change.

Reviewed By: sammy-SC

Differential Revision: D18607656

fbshipit-source-id: f2cfd7c5b7ba9f225a9a0c5a078947a220b2f30d

ReactCommon/fabric/attributedstring/AttributedString.h

@@ -51,6 +51,12 @@ class AttributedString : public Sealable, public DebugStringConvertible {
     bool operator!=(const Fragment &rhs) const;
   };
 
+  class Range {
+   public:
+    int location{0};
+    int length{0};
+  };
+
   using Fragments = better::small_vector<Fragment, 1>;
 
   /*

ReactCommon/fabric/attributedstring/conversions.h

@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include <folly/Conv.h>
 #include <folly/dynamic.h>
 #include <react/attributedstring/AttributedString.h>
 #include <react/attributedstring/ParagraphAttributes.h>
@@ -444,6 +445,26 @@ inline ParagraphAttributes convertRawProp(
   return paragraphAttributes;
 }
 
+inline void fromRawValue(
+    RawValue const &value,
+    AttributedString::Range &result) {
+  auto map = (better::map<std::string, int>)value;
+
+  auto start = map.find("start");
+  if (start != map.end()) {
+    result.location = start->second;
+  }
+  auto end = map.find("end");
+  if (end != map.end()) {
+    result.length = start->second - result.location;
+  }
+}
+
+inline std::string toString(AttributedString::Range const &range) {
+  return "{location: " + folly::to<std::string>(range.location) +
+      ", length: " + folly::to<std::string>(range.length) + "}";
+}
+
 #ifdef ANDROID
 
 inline folly::dynamic toDynamic(
@@ -562,6 +583,13 @@ inline folly::dynamic toDynamic(const AttributedString &attributedString) {
   return value;
 }
 
+inline folly::dynamic toDynamic(AttributedString::Range const &range) {
+  folly::dynamic dynamicValue = folly::dynamic::object();
+  dynamicValue["location"] = range.location;
+  dynamicValue["length"] = range.length;
+  return dynamicValue;
+}
+
 #endif
 
 } // namespace react