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         static const intptr_t nullID = 1;
  44
  45         SourceProvider(const UString& url, const TextPosition& startPosition, SourceProviderCache* cache = 0)
  46             : m_url(url)
  47             , m_startPosition(startPosition)
  48             , m_validated(false)
  49             , m_cache(cache ? cache : new SourceProviderCache)
  50             , m_cacheOwned(!cache)
  51         {
  52             turnOffVerifier();
  53         }
  54         virtual ~SourceProvider()
  55         {
  56             if (m_cacheOwned)
  57                 delete m_cache;
  58         }
  59
  60         virtual UString getRange(int start, int end) const = 0;
  61         virtual const StringImpl* data() const = 0;
  62         virtual int length() const = 0;
  63
  64         const UString& url() { return m_url; }
  65         TextPosition startPosition() const { return m_startPosition; }
  66         intptr_t asID()
  67         {
  68             ASSERT(this);
  69             if (!this) // Be defensive in release mode.
  70                 return nullID;
  71             return reinterpret_cast<intptr_t>(this);
  72         }
  73
  74         bool isValid() const { return m_validated; }
  75         void setValid() { m_validated = true; }
  76
  77         SourceProviderCache* cache() const { return m_cache; }
  78         void notifyCacheSizeChanged(int delta) { if (!m_cacheOwned) cacheSizeChanged(delta); }
  79
  80     private:
  81         virtual void cacheSizeChanged(int delta) { UNUSED_PARAM(delta); }
  82
  83         UString m_url;
  84         TextPosition m_startPosition;
  85         bool m_validated;
  86         SourceProviderCache* m_cache;
  87         bool m_cacheOwned;
  88     };
  89
  90     class UStringSourceProvider : public SourceProvider {
  91     public:
  92         static PassRefPtr<UStringSourceProvider> create(const UString& source, const UString& url, const TextPosition& startPosition = TextPosition::minimumPosition())
  93         {
  94             return adoptRef(new UStringSourceProvider(source, url, startPosition));
  95         }
  96
  97         virtual UString getRange(int start, int end) const OVERRIDE
  98         {
  99             return m_source.substringSharingImpl(start, end - start);
 100         }
 101         const StringImpl* data() const { return m_source.impl(); }
 102         int length() const { return m_source.length(); }
 103
 104     private:
 105         UStringSourceProvider(const UString& source, const UString& url, const TextPosition& startPosition)
 106             : SourceProvider(url, startPosition)
 107             , m_source(source)
 108         {
 109         }
 110
 111         UString m_source;
 112     };
 113
 114 } // namespace JSC
 115
 116 #endif // SourceProvider_h