зеркало из https://github.com/mozilla/gecko-dev.git
126 строки
3.3 KiB
C++
126 строки
3.3 KiB
C++
/* -*- 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.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications. Portions created by Netscape Communications are
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* Copyright (C) 2001 by Netscape Communications. 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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/* nsStringFragment.h --- machinery that makes string iterators work */
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#ifndef nsStringFragment_h___
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#define nsStringFragment_h___
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#ifndef nsStringDefines_h___
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#include "nsStringDefines.h"
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#endif
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/**
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* An |nsFragmentRequest| is used to tell |GetReadableFragment| and
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* |GetWritableFragment| what to do.
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*
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* @see GetReadableFragment
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*/
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enum nsFragmentRequest { kPrevFragment, kFirstFragment, kLastFragment, kNextFragment, kFragmentAt };
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/**
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* A |nsReadableFragment| provides |const| access to a contiguous hunk of
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* string of homogenous units, e.g., bytes (|char|). This doesn't mean it
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* represents a flat hunk. It could be a variable length encoding, for
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* instance UTF-8. And the fragment itself need not be zero-terminated.
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*
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* An |nsReadableFragment| is the underlying machinery that lets
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* |nsReadingIterator|s work.
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*
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* @see nsReadingIterator
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*/
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template <class CharT>
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struct nsReadableFragment
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{
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const CharT* mStart;
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const CharT* mEnd;
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const void* mFragmentIdentifier;
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nsReadableFragment()
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: mStart(0), mEnd(0), mFragmentIdentifier(0)
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{
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// nothing else to do here
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}
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const void*
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GetID() const
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{
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return mFragmentIdentifier;
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}
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unsigned long
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GetIDAsInt() const
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{
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typedef char* char_ptr;
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typedef unsigned long ulong;
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return ulong(char_ptr(mFragmentIdentifier)-char_ptr(0));
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}
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void
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SetID( const void* aID )
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{
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mFragmentIdentifier = aID;
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}
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void
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SetID( unsigned long aID )
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{
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typedef char* char_ptr;
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typedef void* void_ptr;
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mFragmentIdentifier = void_ptr(char_ptr(0)+aID);
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}
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};
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/**
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* A |nsWritableFragment| provides non-|const| access to a contiguous hunk of
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* string of homogenous units, e.g., bytes (|char|). This doesn't mean it
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* represents a flat hunk. It could be a variable length encoding, for
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* instance UTF-8. And the fragment itself need not be zero-terminated.
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*
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* An |nsWritableFragment| is the underlying machinery that lets
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* |nsWritingIterator|s work.
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*
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* @see nsWritingIterator
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*/
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template <class CharT>
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struct nsWritableFragment
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{
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CharT* mStart;
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CharT* mEnd;
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void* mFragmentIdentifier;
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nsWritableFragment()
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: mStart(0), mEnd(0), mFragmentIdentifier(0)
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{
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// nothing else to do here
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}
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};
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#endif /* !defined(nsStringFragment_h___) */
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