parser/SourceProvider.h

   1 /*
   2  * Copyright (C) 2008, 2009 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  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  14  *     its contributors may be used to endorse or promote products derived
  15  *     from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #ifndef SourceProvider_h
  30 #define SourceProvider_h
  31
  32 #include "SourceProviderCache.h"
  33 #include "UString.h"
  34 #include <wtf/PassOwnPtr.h>
  35 #include <wtf/RefCounted.h>
  36 #include <wtf/UnusedParam.h>
  37 #include <wtf/text/TextPosition.h>
  38
  39 namespace JSC {
  40
  41     class SourceProvider : public RefCounted<SourceProvider> {
  42     public:
  43         SourceProvider(const UString& url, SourceProviderCache* cache = 0)
  44             : m_url(url)
  45             , m_validated(false)
  46             , m_cache(cache ? cache : new SourceProviderCache)
  47             , m_cacheOwned(!cache)
  48         {
  49         }
  50         virtual ~SourceProvider()
  51         {
  52             if (m_cacheOwned)
  53                 delete m_cache;
  54         }
  55
  56         virtual UString getRange(int start, int end) const = 0;
  57         virtual const UChar* data() const = 0;
  58         virtual int length() const = 0;
  59
  60         const UString& url() { return m_url; }
  61         virtual TextPosition1 startPosition() const { return TextPosition1::minimumPosition(); }
  62         intptr_t asID() { return reinterpret_cast<intptr_t>(this); }
  63
  64         bool isValid() const { return m_validated; }
  65         void setValid() { m_validated = true; }
  66
  67         SourceProviderCache* cache() const { return m_cache; }
  68         void notifyCacheSizeChanged(int delta) { if (!m_cacheOwned) cacheSizeChanged(delta); }
  69
  70     private:
  71         virtual void cacheSizeChanged(int delta) { UNUSED_PARAM(delta); }
  72
  73         UString m_url;
  74         bool m_validated;
  75         SourceProviderCache* m_cache;
  76         bool m_cacheOwned;
  77     };
  78
  79     class UStringSourceProvider : public SourceProvider {
  80     public:
  81         static PassRefPtr<UStringSourceProvider> create(const UString& source, const UString& url)
  82         {
  83             return adoptRef(new UStringSourceProvider(source, url));
  84         }
  85
  86         UString getRange(int start, int end) const
  87         {
  88             return m_source.substringSharingImpl(start, end - start);
  89         }
  90         const UChar* data() const { return m_source.characters(); }
  91         int length() const { return m_source.length(); }
  92
  93     private:
  94         UStringSourceProvider(const UString& source, const UString& url)
  95             : SourceProvider(url)
  96             , m_source(source)
  97         {
  98         }
  99
 100         UString m_source;
 101     };
 102
 103 } // namespace JSC
 104
 105 #endif // SourceProvider_h