1 files changed, 102 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/API/OpaqueJSString.h b/Source/JavaScriptCore/API/OpaqueJSString.h
new file mode 100644
index 000000000..208131b3b
--- /dev/null
+++ b/Source/JavaScriptCore/API/OpaqueJSString.h
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2008 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 OpaqueJSString_h
+#define OpaqueJSString_h
+
+#include <atomic>
+#include <wtf/ThreadSafeRefCounted.h>
+#include <wtf/text/WTFString.h>
+
+namespace JSC {
+    class Identifier;
+    class VM;
+}
+
+struct OpaqueJSString : public ThreadSafeRefCounted<OpaqueJSString> {
+    static Ref<OpaqueJSString> create()
+    {
+        return adoptRef(*new OpaqueJSString);
+    }
+
+    static Ref<OpaqueJSString> create(const LChar* characters, unsigned length)
+    {
+        return adoptRef(*new OpaqueJSString(characters, length));
+    }
+
+    static Ref<OpaqueJSString> create(const UChar* characters, unsigned length)
+    {
+        return adoptRef(*new OpaqueJSString(characters, length));
+    }
+
+    JS_EXPORT_PRIVATE static RefPtr<OpaqueJSString> create(const String&);
+
+    JS_EXPORT_PRIVATE ~OpaqueJSString();
+
+    bool is8Bit() { return m_string.is8Bit(); }
+    const LChar* characters8() { return m_string.characters8(); }
+    const UChar* characters16() { return m_string.characters16(); }
+    unsigned length() { return m_string.length(); }
+
+    const UChar* characters();
+
+    JS_EXPORT_PRIVATE String string() const;
+    JSC::Identifier identifier(JSC::VM*) const;
+
+    static bool equal(const OpaqueJSString*, const OpaqueJSString*);
+
+private:
+    friend class WTF::ThreadSafeRefCounted<OpaqueJSString>;
+
+    OpaqueJSString()
+        : m_characters(nullptr)
+    {
+    }
+
+    OpaqueJSString(const String& string)
+        : m_string(string.isolatedCopy())
+        , m_characters(m_string.impl() && m_string.is8Bit() ? nullptr : const_cast<UChar*>(m_string.characters16()))
+    {
+    }
+
+    OpaqueJSString(const LChar* characters, unsigned length)
+        : m_string(characters, length)
+        , m_characters(nullptr)
+    {
+    }
+
+    OpaqueJSString(const UChar* characters, unsigned length)
+        : m_string(characters, length)
+        , m_characters(m_string.impl() && m_string.is8Bit() ? nullptr : const_cast<UChar*>(m_string.characters16()))
+    {
+    }
+
+    String m_string;
+
+    // This will be initialized on demand when characters() is called if the string needs up-conversion.
+    std::atomic<UChar*> m_characters;
+};
+
+#endif