parser/SourceCode.h

   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  *
   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 SourceCode_h
  30 #define SourceCode_h
  31
  32 #include "SourceProvider.h"
  33 #include <wtf/RefPtr.h>
  34
  35 namespace JSC {
  36
  37     class SourceCode {
  38     public:
  39         SourceCode()
  40             : m_provider(0)
  41             , m_startChar(0)
  42             , m_endChar(0)
  43             , m_firstLine(0)
  44         {
  45         }
  46
  47         SourceCode(PassRefPtr<SourceProvider> provider, int firstLine = 1)
  48             : m_provider(provider)
  49             , m_startChar(0)
  50             , m_endChar(m_provider->length())
  51             , m_firstLine(std::max(firstLine, 1))
  52         {
  53         }
  54
  55         SourceCode(PassRefPtr<SourceProvider> provider, int start, int end, int firstLine)
  56             : m_provider(provider)
  57             , m_startChar(start)
  58             , m_endChar(end)
  59             , m_firstLine(std::max(firstLine, 1))
  60         {
  61         }
  62
  63         UString toString() const
  64         {
  65             if (!m_provider)
  66                 return UString();
  67             return m_provider->getRange(m_startChar, m_endChar);
  68         }
  69
  70         intptr_t providerID() const
  71         {
  72             if (!m_provider)
  73                 return SourceProvider::nullID;
  74             return m_provider->asID();
  75         }
  76
  77         bool isNull() const { return !m_provider; }
  78         SourceProvider* provider() const { return m_provider.get(); }
  79         int firstLine() const { return m_firstLine; }
  80         int startOffset() const { return m_startChar; }
  81         int endOffset() const { return m_endChar; }
  82         int length() const { return m_endChar - m_startChar; }
  83
  84         SourceCode subExpression(unsigned openBrace, unsigned closeBrace, int firstLine);
  85
  86     private:
  87         RefPtr<SourceProvider> m_provider;
  88         int m_startChar;
  89         int m_endChar;
  90         int m_firstLine;
  91     };
  92
  93     inline SourceCode makeSource(const UString& source, const UString& url = UString(), const TextPosition& startPosition = TextPosition::minimumPosition())
  94     {
  95         return SourceCode(UStringSourceProvider::create(source, url, startPosition), startPosition.m_line.oneBasedInt());
  96     }
  97
  98     inline SourceCode SourceCode::subExpression(unsigned openBrace, unsigned closeBrace, int firstLine)
  99     {
 100         ASSERT((*provider()->data())[openBrace] == '{');
 101         ASSERT((*provider()->data())[closeBrace] == '}');
 102         return SourceCode(provider(), openBrace, closeBrace + 1, firstLine);
 103     }
 104
 105 } // namespace JSC
 106
 107 #endif // SourceCode_h