Home | History | Annotate | Download | only in v8 
      1 /*
      2  * Copyright (C) 2008, 2009 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef ScriptStringImpl_h
     32 #define ScriptStringImpl_h
     33 
     34 #include "OwnHandle.h"
     35 #include "PlatformString.h"
     36 
     37 #include <v8.h>
     38 
     39 namespace WebCore {
     40 
     41 // 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
     42 // Currently XMLHttpRequest uses a ScriptString to build up the responseText attribute.  As data arrives from the network, it is appended to the ScriptString
     43 // via operator+= and a JavaScript readystatechange event is fired.  JavaScript can access the responseText attribute of the XMLHttpRequest object.  JavaScript
     44 // may also query the responseXML attribute of the XMLHttpRequest object which results in the responseText attribute being coerced into a WebCore::String and
     45 // then parsed as an XML document.
     46 // This implementation optimizes for the common case where the responseText is built up with many calls to operator+= before the actual text is queried.
     47 class ScriptStringImpl : public RefCounted<ScriptStringImpl> {
     48 public:
     49     static PassRefPtr<ScriptStringImpl> create(const String& s)
     50     {
     51         return adoptRef(new ScriptStringImpl(s));
     52     }
     53 
     54     static PassRefPtr<ScriptStringImpl> create(const char* s)
     55     {
     56         return adoptRef(new ScriptStringImpl(s));
     57     }
     58 
     59     String toString() const;
     60 
     61     bool isNull() const;
     62     size_t size() const;
     63 
     64     void append(const String& s);
     65 
     66     v8::Handle<v8::String> v8StringHandle() { return m_handle.get(); }
     67 
     68 private:
     69     ScriptStringImpl(const String& s);
     70     ScriptStringImpl(const char* s);
     71 
     72     OwnHandle<v8::String> m_handle;
     73 };
     74 
     75 } // namespace WebCore
     76 
     77 #endif // ScriptStringImpl_h
     78