Re-delete V8Binding and use the upstreamed version

webkit/port/bindings/v8/v8_binding.cpp

-// 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, bool externalize) {
-  WebCoreStringResource* str_resource = static_cast<WebCoreStringResource*>(
-      v8_str->GetExternalStringResource());
-  if (str_resource) {
-    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 StringImpl::empty();
-  }
-
-  UChar* buffer;
-  String result = String::createUninitialized(length, buffer);
-  v8_str->Write(reinterpret_cast<uint16_t*>(buffer), 0, length);
-
-  if (externalize) {
-    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) {
-  if (obj->IsString()) {
-    v8::Handle<v8::String> v8_str = v8::Handle<v8::String>::Cast(obj);
-    String webCoreString = v8StringToWebCoreString(v8_str, true);
-    return webCoreString;
-  } else if (obj->IsInt32()) {
-    int value = obj->Int32Value();
-    // Most numbers used are <= 100. Even if they aren't used
-    // there's very little in using the space.
-    const int kLowNumbers = 100;
-    static AtomicString lowNumbers[kLowNumbers + 1];
-    String webCoreString;
-    if (0 <= value && value <= kLowNumbers) {
-      webCoreString = lowNumbers[value];
-      if (!webCoreString) {
-        AtomicString valueString = AtomicString(String::number(value));
-        lowNumbers[value] = valueString;
-        webCoreString = valueString;
-      }
-    } else {
-      webCoreString = String::number(value);
-    }
-    return webCoreString;
-  } else {
-    v8::TryCatch block;
-    v8::Handle<v8::String> v8_str = obj->ToString();
-    // Check for empty handles to handle the case where an exception
-    // is thrown as part of invoking toString on the object.
-    if (v8_str.IsEmpty())
-      return StringImpl::empty();
-    return v8StringToWebCoreString(v8_str, false);
-  }
-}
-
-
-AtomicString v8StringToAtomicWebCoreString(v8::Handle<v8::String> v8_str) {
-  String str = v8StringToWebCoreString(v8_str, true);
-  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