diff -r 000000000000 -r 4f2f89ce4247 WebCore/bindings/v8/ScriptStringImpl.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/bindings/v8/ScriptStringImpl.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2008, 2009 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef ScriptStringImpl_h
+#define ScriptStringImpl_h
+
+#include "OwnHandle.h"
+#include "PlatformString.h"
+
+#include <v8.h>
+
+namespace WebCore {
+
+// This class is used for strings that tend to be shared with JavaScript frequently.  The JSC implementation uses wtf::UString - see bindings/js/ScriptString.h
+// Currently XMLHttpRequest uses a ScriptString to build up the responseText attribute.  As data arrives from the network, it is appended to the ScriptString
+// via operator+= and a JavaScript readystatechange event is fired.  JavaScript can access the responseText attribute of the XMLHttpRequest object.  JavaScript
+// may also query the responseXML attribute of the XMLHttpRequest object which results in the responseText attribute being coerced into a WebCore::String and
+// then parsed as an XML document.
+// This implementation optimizes for the common case where the responseText is built up with many calls to operator+= before the actual text is queried.
+class ScriptStringImpl : public RefCounted<ScriptStringImpl> {
+public:
+    static PassRefPtr<ScriptStringImpl> create(const String& s)
+    {
+        return adoptRef(new ScriptStringImpl(s));
+    }
+
+    static PassRefPtr<ScriptStringImpl> create(const char* s)
+    {
+        return adoptRef(new ScriptStringImpl(s));
+    }
+
+    String toString() const;
+
+    bool isNull() const;
+    size_t size() const;
+
+    void append(const String& s);
+
+    v8::Handle<v8::String> v8StringHandle() { return m_handle.get(); }
+
+private:
+    ScriptStringImpl(const String& s);
+    ScriptStringImpl(const char* s);
+
+    OwnHandle<v8::String> m_handle;
+};
+
+} // namespace WebCore
+
+#endif // ScriptStringImpl_h