1 files changed, 120 insertions, 0 deletions
diff --git a/V8Binding/v8/v8_binding.cpp b/V8Binding/v8/v8_binding.cpp
new file mode 100644
index 0000000..3a36fc5
--- /dev/null
+++ b/V8Binding/v8/v8_binding.cpp
@@ -0,0 +1,120 @@
+// Copyright (c) 2006-2008 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 "v8_binding.h"
+
+#include "AtomicString.h"
+#include "CString.h"
+#include "MathExtras.h"
+#include "PlatformString.h"
+#include "StringBuffer.h"
+
+#include <v8.h>
+
+namespace WebCore {
+
+// WebCoreStringResource is a helper class for v8ExternalString. It is used
+// to manage the life-cycle of the underlying buffer of the external string.
+class WebCoreStringResource: public v8::String::ExternalStringResource {
+ public:
+  explicit WebCoreStringResource(const String& str)
+      : impl_(str.impl()) { }
+
+  virtual ~WebCoreStringResource() {}
+
+  const uint16_t* data() const {
+    return reinterpret_cast<const uint16_t*>(impl_.characters());
+  }
+
+  size_t length() const { return impl_.length(); }
+
+  String webcore_string() { return impl_; }
+
+ private:
+  // A shallow copy of the string.
+  // Keeps the string buffer alive until the V8 engine garbage collects it.
+  String impl_;
+};
+
+String v8StringToWebCoreString(v8::Handle<v8::String> v8_str) {
+  if (v8_str->IsExternal()) {
+    WebCoreStringResource* str_resource = static_cast<WebCoreStringResource*>(
+        v8_str->GetExternalStringResource());
+    return str_resource->webcore_string();
+  }
+
+  int length = v8_str->Length();
+  if (length == 0) {
+    // Avoid trying to morph empty strings, as they do not have enough room to
+    // contain the external reference.
+    return "";
+  }
+
+  // Copy the characters from the v8::String into a WebCore::String and allocate
+  // an external resource which will be attached to the v8::String.
+  String result;
+  const int kStringSizeToCopy = 256;
+  if (length < kStringSizeToCopy) {
+    uint16_t buffer[kStringSizeToCopy];
+    v8_str->Write(buffer, 0, length);
+    result = StringImpl::create(reinterpret_cast<UChar*>(buffer), length);
+  } else {
+    StringBuffer buf(length);
+    v8_str->Write(reinterpret_cast<uint16_t*>(buf.characters()), 0, length);
+    result = String::adopt(buf);
+  }
+
+//
+//  TODO(mbelshe): Disable string morphing because it causes mystery
+//     perf regressions on intl1 and intl2 page cyclers.  It works fine
+//     on machines other than the buildbots.
+//
+//  WebCoreStringResource* resource = new WebCoreStringResource(result);
+//  if (!v8_str->MakeExternal(resource)) {
+//    // In case of a failure delete the external resource as it was not used.
+//    delete resource;
+//  }
+  return result;
+}
+
+
+String v8ValueToWebCoreString(v8::Handle<v8::Value> obj) {
+  v8::Handle<v8::String> v8_str;
+  if (obj->IsString()) {
+    v8_str = v8::Handle<v8::String>::Cast(obj);
+  } else {
+    v8::TryCatch block;
+    v8_str = obj->ToString();
+    if (v8_str.IsEmpty())
+      return "";
+  }
+  return v8StringToWebCoreString(v8_str);
+}
+
+
+AtomicString v8StringToAtomicWebCoreString(v8::Handle<v8::String> v8_str) {
+  String str = v8StringToWebCoreString(v8_str);
+  return AtomicString(str);
+}
+
+
+AtomicString v8ValueToAtomicWebCoreString(v8::Handle<v8::Value> v8_str) {
+  String str = v8ValueToWebCoreString(v8_str);
+  return AtomicString(str);
+}
+
+
+v8::Handle<v8::String> v8String(const String& str) {
+  if (!str.length())
+    return v8::String::Empty();
+  return v8::String::NewExternal(new WebCoreStringResource(str));	
+}
+
+v8::Local<v8::String> v8ExternalString(const String& str) {
+  if (!str.length())
+    return v8::String::Empty();
+  return v8::String::NewExternal(new WebCoreStringResource(str));	
+}
+
+}  // namespace WebCore