Add PropNameID::fromSymbol

Summary:
Changelog:
[General][Added] - Add ability to access properties with symbol keys through JSI

Reviewed By: mhorowitz

Differential Revision: D33830544

fbshipit-source-id: 8de366b4c7d5ea9d2fd5df70dfb776a056e23806

Author: neildhar

ReactCommon/jsi/JSCRuntime.cpp

@@ -151,6 +151,7 @@ class JSCRuntime : public jsi::Runtime {
   jsi::PropNameID createPropNameIDFromUtf8(const uint8_t *utf8, size_t length)
       override;
   jsi::PropNameID createPropNameIDFromString(const jsi::String &str) override;
+  jsi::PropNameID createPropNameIDFromSymbol(const jsi::Symbol &sym) override;
   std::string utf8(const jsi::PropNameID &) override;
   bool compare(const jsi::PropNameID &, const jsi::PropNameID &) override;
 
@@ -653,6 +654,13 @@ jsi::PropNameID JSCRuntime::createPropNameIDFromString(const jsi::String &str) {
   return createPropNameID(stringRef(str));
 }
 
+jsi::PropNameID JSCRuntime::createPropNameIDFromSymbol(const jsi::Symbol &sym) {
+  // TODO: Support for symbols through the native API in JSC is very limited.
+  // While we could construct a PropNameID here, we would not be able to get a
+  // symbol property through the C++ API.
+  throw std::logic_error("Not implemented");
+}
+
 std::string JSCRuntime::utf8(const jsi::PropNameID &sym) {
   return JSStringToSTLString(stringRef(sym));
 }

ReactCommon/jsi/jsi/decorator.h

@@ -176,6 +176,9 @@ class RuntimeDecorator : public Base, private jsi::Instrumentation {
   PropNameID createPropNameIDFromString(const String& str) override {
     return plain_.createPropNameIDFromString(str);
   };
+  PropNameID createPropNameIDFromSymbol(const Symbol& sym) override {
+    return plain_.createPropNameIDFromSymbol(sym);
+  };
   std::string utf8(const PropNameID& id) override {
     return plain_.utf8(id);
   };

ReactCommon/jsi/jsi/jsi.h

@@ -274,6 +274,7 @@ class JSI_EXPORT Runtime {
       const uint8_t* utf8,
       size_t length) = 0;
   virtual PropNameID createPropNameIDFromString(const String& str) = 0;
+  virtual PropNameID createPropNameIDFromSymbol(const Symbol& sym) = 0;
   virtual std::string utf8(const PropNameID&) = 0;
   virtual bool compare(const PropNameID&, const PropNameID&) = 0;
 
@@ -425,6 +426,11 @@ class JSI_EXPORT PropNameID : public Pointer {
     return runtime.createPropNameIDFromString(str);
   }
 
+  /// Create a PropNameID from a JS symbol.
+  static PropNameID forSymbol(Runtime& runtime, const jsi::Symbol& sym) {
+    return runtime.createPropNameIDFromSymbol(sym);
+  }
+
   // Creates a vector of PropNameIDs constructed from given arguments.
   template <typename... Args>
   static std::vector<PropNameID> names(Runtime& runtime, Args&&... args);