[WIP] ReadableStream V8 extension

Source/platform/streams/WebStreams.cpp

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "public/platform/WebStreams.h"
+
+#include "wtf/Assertions.h"
+
+// TODO(domenic): auto-run js2c.py ReadableStream.js ReadableStream.cpp blink kStreamsExtensionCode using GYP
+// Also check to make sure this (ab)use of #include is kosher.
+// Also should we include the build products in the checkout? Probably not?
+#include "./ReadableStream.cpp"
+
+// TODO(domenic): presubmit checks don't like include order here ("Alphabetical sorting problem.")
+
+namespace blink {
+
+const char kStreamsExtensionName[] = "blink/streams";
+
+class StreamsExtensionImpl : public v8::Extension {
+    public:
+        StreamsExtensionImpl() : v8::Extension(kStreamsExtensionName, kStreamsExtensionCode) { }
+
+    private:
+        v8::Handle<v8::FunctionTemplate> GetNativeFunctionTemplate(
+            v8::Isolate* isolate, v8::Handle<v8::String> name) override
+        {
+
+            if (name->Equals(v8::String::NewFromUtf8(isolate, "SET_PRIVATE"))) {
+                return v8::FunctionTemplate::New(isolate, SetPrivate);
+            }
+            if (name->Equals(v8::String::NewFromUtf8(isolate, "GET_PRIVATE"))) {
+                return v8::FunctionTemplate::New(isolate, GetPrivate);
+            }
+            if (name->Equals(v8::String::NewFromUtf8(isolate, "HAS_PRIVATE"))) {
+                return v8::FunctionTemplate::New(isolate, HasPrivate);
+            }
+
+            return v8::Handle<v8::FunctionTemplate>();
+        }
+
+        static void GetPrivate(const v8::FunctionCallbackInfo<v8::Value>& info)
+        {
+            ASSERT(info.Length() == 2 && info[0]->IsObject() && info[1]->IsString());
+
+            auto isolate = info.GetIsolate();
+            v8::HandleScope scope(isolate);
+            auto object = info[0].As<v8::Object>();
+            auto name = info[1].As<v8::String>();
+
+            auto privateSymbol = v8::Private::ForApi(isolate, name);
+            auto value = object->GetPrivate(privateSymbol);
+
+            info.GetReturnValue().Set(value);
+        }
+
+        static void HasPrivate(const v8::FunctionCallbackInfo<v8::Value>& info)
+        {
+            ASSERT(info.Length() == 2 && info[0]->IsObject() && info[1]->IsString());
+
+            auto isolate = info.GetIsolate();
+            v8::HandleScope scope(isolate);
+            auto object = info[0].As<v8::Object>();
+            auto name = info[1].As<v8::String>();
+
+            auto privateSymbol = v8::Private::ForApi(isolate, name);
+            auto value = object->HasPrivate(privateSymbol);
+
+            info.GetReturnValue().Set(value);
+        }
+
+        static void SetPrivate(const v8::FunctionCallbackInfo<v8::Value>& info)
+        {
+            ASSERT(info.Length() == 3 && info[0]->IsObject() && info[1]->IsString());
+
+            auto isolate = info.GetIsolate();
+            v8::HandleScope scope(isolate);
+            auto object = info[0].As<v8::Object>();
+            auto name = info[1].As<v8::String>();
+            auto value = info[2];
+
+            auto privateSymbol = v8::Private::ForApi(isolate, name);
+            object->SetPrivate(privateSymbol, value);
+        }
+};
+
+v8::Extension* WebStreams::CreateV8Extension()
+{
+    return new StreamsExtensionImpl();
+}
+
+} // namespace blink