Add gin, a lightweight bindings system for V8

gin/converter.cc

+// Copyright 2013 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 "gin/converter.h"
+
+#include "v8/include/v8.h"
+
+using v8::Boolean;
+using v8::Function;
+using v8::Handle;
+using v8::Integer;
+using v8::Isolate;
+using v8::Number;
+using v8::Object;
+using v8::String;
+using v8::Value;
+
+namespace gin {
+
+Handle<Value> Converter<bool>::ToV8(Isolate* isolate, bool val) {
+  return Boolean::New(val).As<Value>();
+}
+
+bool Converter<bool>::FromV8(Handle<Value> val, bool* out) {
+  *out = val->BooleanValue();
+  return true;
+}
+
+Handle<Value> Converter<int32_t>::ToV8(Isolate* isolate, int32_t val) {
+  return Integer::New(val, isolate).As<Value>();
+}
+
+bool Converter<int32_t>::FromV8(Handle<Value> val, int32_t* out) {
+  if (!val->IsInt32())
+    return false;
+  *out = val->Int32Value();
+  return true;
+}
+
+Handle<Value> Converter<uint32_t>::ToV8(Isolate* isolate, uint32_t val) {
+  return Integer::NewFromUnsigned(val, isolate).As<Value>();
+}
+
+bool Converter<uint32_t>::FromV8(Handle<Value> val, uint32_t* out) {
+  if (!val->IsUint32())
+    return false;
+  *out = val->Uint32Value();
+  return true;
+}
+
+Handle<Value> Converter<double>::ToV8(Isolate* isolate, double val) {
+  return Number::New(isolate, val).As<Value>();
+}
+
+bool Converter<double>::FromV8(Handle<Value> val, double* out) {
+  if (!val->IsNumber())
+    return false;
+  *out = val->NumberValue();
+  return true;
+}
+
+Handle<Value> Converter<std::string>::ToV8(Isolate* isolate,
+                                           const std::string& val) {
+  return String::NewFromUtf8(isolate,
+                             val.data(),
+                             String::kNormalString,
+                             val.length());
+}
+
+bool Converter<std::string>::FromV8(Handle<Value> val,
+                                    std::string* out) {
+  if (!val->IsString())
+    return false;
+  Handle<String> str = Handle<String>::Cast(val);
+  int length = str->Utf8Length();
+  out->resize(length);
+  str->WriteUtf8(&(*out)[0], length, NULL, String::NO_NULL_TERMINATION);
+  return true;
+}
+
+bool Converter<Handle<Function> >::FromV8(Handle<Value> val,
+                                          Handle<Function>* out) {
+  if (!val->IsFunction())
+    return false;
+  *out = Handle<Function>::Cast(val);
+  return true;
+}
+
+Handle<Value> Converter<Handle<Object> >::ToV8(Handle<Object> val) {
+  return val.As<Value>();
+}
+
+bool Converter<Handle<Object> >::FromV8(Handle<Value> val,
+                                        Handle<Object>* out) {
+  if (!val->IsObject())
+    return false;
+  *out = Handle<Object>::Cast(val);
+  return true;
+}
+
+}  // namespace gin