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      1 /*
      2  * Copyright (C) 2013 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
      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 GOOGLE 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 GOOGLE 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 #ifndef HTMLIdentifier_h
     27 #define HTMLIdentifier_h
     28 
     29 #include "wtf/text/WTFString.h"
     30 
     31 namespace WebCore {
     32 
     33 class QualifiedName;
     34 
     35 enum CharacterWidth {
     36     Likely8Bit,
     37     Force8Bit,
     38     Force16Bit
     39 };
     40 
     41 class HTMLIdentifier {
     42 public:
     43     HTMLIdentifier() { }
     44 
     45     template<size_t inlineCapacity>
     46     HTMLIdentifier(const Vector<UChar, inlineCapacity>& vector, CharacterWidth width)
     47         : m_string(findIfKnown(vector.data(), vector.size()))
     48     {
     49         if (m_string.impl())
     50             return;
     51         if (width == Likely8Bit)
     52             m_string = StringImpl::create8BitIfPossible(vector);
     53         else if (width == Force8Bit)
     54             m_string = String::make8BitFrom16BitSource(vector);
     55         else
     56             m_string = String(vector);
     57     }
     58 
     59     // asString should only be used on the main thread.
     60     const String& asString() const;
     61     // asStringImpl() is safe to call from any thread.
     62     const StringImpl* asStringImpl() const;
     63 
     64     static void init();
     65 
     66     bool isSafeToSendToAnotherThread() const { return m_string.isSafeToSendToAnotherThread(); }
     67 
     68 #ifndef NDEBUG
     69     static bool isKnown(const StringImpl*);
     70 #endif
     71 
     72 private:
     73     static unsigned maxNameLength;
     74     static StringImpl* findIfKnown(const UChar* characters, unsigned length);
     75     static void addNames(QualifiedName** names, unsigned namesCount, unsigned indexOffset);
     76 
     77     String m_string;
     78 };
     79 
     80 }
     81 
     82 #endif
     83