API/OpaqueJSString.cpp

   1 /*
   2  * Copyright (C) 2008 Apple 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
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "OpaqueJSString.h"
  28
  29 #include <interpreter/CallFrame.h>
  30 #include <runtime/JSGlobalObject.h>
  31 #include <runtime/Identifier.h>
  32
  33 using namespace JSC;
  34
  35 PassRefPtr<OpaqueJSString> OpaqueJSString::create(const String& string)
  36 {
  37     if (!string.isNull())
  38         return adoptRef(new OpaqueJSString(string));
  39     return 0;
  40 }
  41
  42 String OpaqueJSString::string() const
  43 {
  44     if (!this)
  45         return String();
  46
  47     // Return a copy of the wrapped string, because the caller may make it an Identifier.
  48     return m_string.isolatedCopy();
  49 }
  50
  51 Identifier OpaqueJSString::identifier(VM* vm) const
  52 {
  53     if (!this || m_string.isNull())
  54         return Identifier();
  55
  56     if (m_string.isEmpty())
  57         return Identifier(Identifier::EmptyIdentifier);
  58
  59     if (m_string.is8Bit())
  60         return Identifier(vm, m_string.characters8(), m_string.length());
  61
  62     return Identifier(vm, m_string.characters16(), m_string.length());
  63 }