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136 lines
4.5 KiB
C++
Executable File
136 lines
4.5 KiB
C++
Executable File
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla strings.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 2000 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Scott Collins <scc@mozilla.org> (original author)
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*
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*/
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#ifndef nsSlidingString_h___
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#define nsSlidingString_h___
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#include "nsAReadableString.h"
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#include "nsSharedBufferList.h"
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/**
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* Maintains the sequence from the prev-most referenced buffer to the last buffer.
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* As prev-most buffers become un-referenced, they are unlinked from the list
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* and destroyed.
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*
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* One or more |nsSlidingSubstring|s may reference into the list. Each |nsSlidingSubstring|
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* holds a reference into the prev-most buffer intersecting the
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* substring it describes. The destructor of a |nsSlidingSubstring| releases this
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* reference, allowing the buffer list to destroy the contiguous prefix of
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* unreferenced buffers.
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*
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* A single instance of |nsSlidingString| may reference this list.
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* Through that interface, new data can be appended onto the next-most end
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* of the list. |nsSlidingString| also the client to advance its starting point.
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*
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*/
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class nsSlidingSharedBufferList
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: public nsSharedBufferList
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{
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public:
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nsSlidingSharedBufferList( Buffer* aBuffer ) : nsSharedBufferList(aBuffer), mRefCount(0) { }
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void AcquireReference() { ++mRefCount; }
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void ReleaseReference() { if ( !--mRefCount ) delete this; }
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void DiscardUnreferencedPrefix( Buffer* );
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private:
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PRUint32 mRefCount;
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};
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/**
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* a substring over a buffer list, this
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*/
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class nsSlidingSubstring
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: public nsPromiseReadable<PRUnichar>
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{
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public:
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typedef nsSlidingSharedBufferList::Buffer Buffer;
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typedef nsSlidingSharedBufferList::Position Position;
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nsSlidingSubstring( const nsSlidingSubstring& ); // copy-constructor
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nsSlidingSubstring( const nsSlidingSubstring& aString, const nsReadingIterator<PRUnichar>& aStart, const nsReadingIterator<PRUnichar>& aEnd );
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~nsSlidingSubstring();
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virtual PRUint32 Length() const { return mLength; }
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protected:
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nsSlidingSubstring( nsSlidingSharedBufferList& aBufferList );
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virtual const PRUnichar* GetReadableFragment( nsReadableFragment<PRUnichar>&, nsFragmentRequest, PRUint32 ) const;
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private:
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// can't assign into me, I'm a read-only reference
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void operator=( const nsSlidingSubstring& ); // NOT TO BE IMPLEMENTED
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protected:
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Position mStart;
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Position mEnd;
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nsSlidingSharedBufferList& mBufferList;
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PRUint32 mLength;
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};
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/**
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* An |nsSlidingSharedBufferList| may be modified by zero or one instances of this class.
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*
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*/
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class nsSlidingString
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: public nsSlidingSubstring
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{
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public:
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nsSlidingString( PRUnichar* aStorageStart, PRUnichar* aDataEnd, PRUnichar* aStorageEnd );
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// ...created by consuming ownership of a buffer ... |aStorageStart| must point to something
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// that it will be OK for the slidking string to call |nsMemory::Free| on
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// you are giving ownership to the string, it takes and keeps your buffer, deleting it (with |nsMemory::Free|) when done
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void AppendBuffer( PRUnichar* aStorageStart, PRUnichar* aDataEnd, PRUnichar* aStorageEnd );
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// void Append( ... ); do you want some |Append|s that copy the supplied data?
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void DiscardPrefix( const nsReadingIterator<PRUnichar>& );
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// any other way you want to do this?
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private:
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nsSlidingString( const nsSlidingString& ); // NOT TO BE IMPLEMENTED
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void operator=( const nsSlidingString& ); // NOT TO BE IMPLEMENTED
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};
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#if 0
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// this (or something similar) is what should appear in the parser, I think
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#include "nsSlidingString.h"
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typedef nsSlidingString nsParserString;
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typedef nsSlidingSubstring nsParserToken;
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#endif
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#endif // !defined(nsSlidingString_h___)
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