mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-08 04:27:37 +00:00
126 lines
3.3 KiB
C++
126 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/*
|
|
* The contents of this file are subject to the Mozilla Public
|
|
* License Version 1.1 (the "License"); you may not use this file
|
|
* except in compliance with the License. You may obtain a copy of
|
|
* the License at http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS
|
|
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
|
|
* implied. See the License for the specific language governing
|
|
* rights and limitations under the License.
|
|
*
|
|
* The Original Code is Mozilla.
|
|
*
|
|
* The Initial Developer of the Original Code is Netscape
|
|
* Communications. Portions created by Netscape Communications are
|
|
* Copyright (C) 2001 by Netscape Communications. All
|
|
* Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
* Scott Collins <scc@mozilla.org> (original author)
|
|
*/
|
|
|
|
/* nsStringFragment.h --- machinery that makes string iterators work */
|
|
|
|
#ifndef nsStringFragment_h___
|
|
#define nsStringFragment_h___
|
|
|
|
#ifndef nsStringDefines_h___
|
|
#include "nsStringDefines.h"
|
|
#endif
|
|
|
|
|
|
/**
|
|
* An |nsFragmentRequest| is used to tell |GetReadableFragment| and
|
|
* |GetWritableFragment| what to do.
|
|
*
|
|
* @see GetReadableFragment
|
|
*/
|
|
|
|
enum nsFragmentRequest { kPrevFragment, kFirstFragment, kLastFragment, kNextFragment, kFragmentAt };
|
|
|
|
|
|
/**
|
|
* A |nsReadableFragment| provides |const| access to a contiguous hunk of
|
|
* string of homogenous units, e.g., bytes (|char|). This doesn't mean it
|
|
* represents a flat hunk. It could be a variable length encoding, for
|
|
* instance UTF-8. And the fragment itself need not be zero-terminated.
|
|
*
|
|
* An |nsReadableFragment| is the underlying machinery that lets
|
|
* |nsReadingIterator|s work.
|
|
*
|
|
* @see nsReadingIterator
|
|
*/
|
|
|
|
template <class CharT>
|
|
struct nsReadableFragment
|
|
{
|
|
const CharT* mStart;
|
|
const CharT* mEnd;
|
|
const void* mFragmentIdentifier;
|
|
|
|
nsReadableFragment()
|
|
: mStart(0), mEnd(0), mFragmentIdentifier(0)
|
|
{
|
|
// nothing else to do here
|
|
}
|
|
|
|
const void*
|
|
GetID() const
|
|
{
|
|
return mFragmentIdentifier;
|
|
}
|
|
|
|
unsigned long
|
|
GetIDAsInt() const
|
|
{
|
|
typedef char* char_ptr;
|
|
typedef unsigned long ulong;
|
|
return ulong(char_ptr(mFragmentIdentifier)-char_ptr(0));
|
|
}
|
|
|
|
void
|
|
SetID( const void* aID )
|
|
{
|
|
mFragmentIdentifier = aID;
|
|
}
|
|
|
|
void
|
|
SetID( unsigned long aID )
|
|
{
|
|
typedef char* char_ptr;
|
|
typedef void* void_ptr;
|
|
mFragmentIdentifier = void_ptr(char_ptr(0)+aID);
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* A |nsWritableFragment| provides non-|const| access to a contiguous hunk of
|
|
* string of homogenous units, e.g., bytes (|char|). This doesn't mean it
|
|
* represents a flat hunk. It could be a variable length encoding, for
|
|
* instance UTF-8. And the fragment itself need not be zero-terminated.
|
|
*
|
|
* An |nsWritableFragment| is the underlying machinery that lets
|
|
* |nsWritingIterator|s work.
|
|
*
|
|
* @see nsWritingIterator
|
|
*/
|
|
|
|
template <class CharT>
|
|
struct nsWritableFragment
|
|
{
|
|
CharT* mStart;
|
|
CharT* mEnd;
|
|
void* mFragmentIdentifier;
|
|
|
|
nsWritableFragment()
|
|
: mStart(0), mEnd(0), mFragmentIdentifier(0)
|
|
{
|
|
// nothing else to do here
|
|
}
|
|
};
|
|
|
|
#endif /* !defined(nsStringFragment_h___) */
|