mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-08 04:27:37 +00:00
359 lines
8.3 KiB
C++
359 lines
8.3 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)
|
|
*/
|
|
|
|
#ifndef nsStringIterator_h___
|
|
#define nsStringIterator_h___
|
|
|
|
#ifndef nsCharTraits_h___
|
|
#include "nsCharTraits.h"
|
|
#endif
|
|
|
|
#ifndef nsAlgorithm_h___
|
|
#include "nsAlgorithm.h"
|
|
#endif
|
|
|
|
#ifndef nsDebug_h___
|
|
#include "nsDebug.h"
|
|
#endif
|
|
|
|
/**
|
|
* @see nsTAString
|
|
*/
|
|
|
|
template <class CharT>
|
|
class nsReadingIterator
|
|
{
|
|
public:
|
|
typedef nsReadingIterator<CharT> self_type;
|
|
typedef ptrdiff_t difference_type;
|
|
typedef CharT value_type;
|
|
typedef const CharT* pointer;
|
|
typedef const CharT& reference;
|
|
|
|
private:
|
|
friend class nsAString;
|
|
friend class nsACString;
|
|
friend class nsSubstring;
|
|
friend class nsCSubstring;
|
|
|
|
// unfortunately, the API for nsReadingIterator requires that the
|
|
// iterator know its start and end positions. this was needed when
|
|
// we supported multi-fragment strings, but now it is really just
|
|
// extra baggage. we should remove mStart and mEnd at some point.
|
|
|
|
const CharT* mStart;
|
|
const CharT* mEnd;
|
|
const CharT* mPosition;
|
|
|
|
public:
|
|
nsReadingIterator() { }
|
|
// nsReadingIterator( const nsReadingIterator<CharT>& ); // auto-generated copy-constructor OK
|
|
// nsReadingIterator<CharT>& operator=( const nsReadingIterator<CharT>& ); // auto-generated copy-assignment operator OK
|
|
|
|
inline void normalize_forward() {}
|
|
inline void normalize_backward() {}
|
|
|
|
pointer
|
|
start() const
|
|
{
|
|
return mStart;
|
|
}
|
|
|
|
pointer
|
|
end() const
|
|
{
|
|
return mEnd;
|
|
}
|
|
|
|
pointer
|
|
get() const
|
|
{
|
|
return mPosition;
|
|
}
|
|
|
|
CharT
|
|
operator*() const
|
|
{
|
|
return *get();
|
|
}
|
|
|
|
#if 0
|
|
// An iterator really deserves this, but some compilers (notably IBM VisualAge for OS/2)
|
|
// don't like this when |CharT| is a type without members.
|
|
pointer
|
|
operator->() const
|
|
{
|
|
return get();
|
|
}
|
|
#endif
|
|
|
|
self_type&
|
|
operator++()
|
|
{
|
|
++mPosition;
|
|
return *this;
|
|
}
|
|
|
|
self_type
|
|
operator++( int )
|
|
{
|
|
self_type result(*this);
|
|
++mPosition;
|
|
return result;
|
|
}
|
|
|
|
self_type&
|
|
operator--()
|
|
{
|
|
--mPosition;
|
|
return *this;
|
|
}
|
|
|
|
self_type
|
|
operator--( int )
|
|
{
|
|
self_type result(*this);
|
|
--mPosition;
|
|
return result;
|
|
}
|
|
|
|
difference_type
|
|
size_forward() const
|
|
{
|
|
return mEnd - mPosition;
|
|
}
|
|
|
|
difference_type
|
|
size_backward() const
|
|
{
|
|
return mPosition - mStart;
|
|
}
|
|
|
|
self_type&
|
|
advance( difference_type n )
|
|
{
|
|
if (n > 0)
|
|
{
|
|
difference_type step = NS_MIN(n, size_forward());
|
|
|
|
NS_ASSERTION(step>0, "can't advance a reading iterator beyond the end of a string");
|
|
|
|
mPosition += step;
|
|
}
|
|
else if (n < 0)
|
|
{
|
|
difference_type step = NS_MAX(n, -size_backward());
|
|
|
|
NS_ASSERTION(step<0, "can't advance (backward) a reading iterator beyond the end of a string");
|
|
|
|
mPosition += step;
|
|
}
|
|
return *this;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* @see nsTAString
|
|
*/
|
|
|
|
template <class CharT>
|
|
class nsWritingIterator
|
|
{
|
|
public:
|
|
typedef nsWritingIterator<CharT> self_type;
|
|
typedef ptrdiff_t difference_type;
|
|
typedef CharT value_type;
|
|
typedef CharT* pointer;
|
|
typedef CharT& reference;
|
|
|
|
private:
|
|
friend class nsAString;
|
|
friend class nsACString;
|
|
friend class nsSubstring;
|
|
friend class nsCSubstring;
|
|
|
|
// unfortunately, the API for nsWritingIterator requires that the
|
|
// iterator know its start and end positions. this was needed when
|
|
// we supported multi-fragment strings, but now it is really just
|
|
// extra baggage. we should remove mStart and mEnd at some point.
|
|
|
|
CharT* mStart;
|
|
CharT* mEnd;
|
|
CharT* mPosition;
|
|
|
|
public:
|
|
nsWritingIterator() { }
|
|
// nsWritingIterator( const nsWritingIterator<CharT>& ); // auto-generated copy-constructor OK
|
|
// nsWritingIterator<CharT>& operator=( const nsWritingIterator<CharT>& ); // auto-generated copy-assignment operator OK
|
|
|
|
inline void normalize_forward() {}
|
|
inline void normalize_backward() {}
|
|
|
|
pointer
|
|
start() const
|
|
{
|
|
return mStart;
|
|
}
|
|
|
|
pointer
|
|
end() const
|
|
{
|
|
return mEnd;
|
|
}
|
|
|
|
pointer
|
|
get() const
|
|
{
|
|
return mPosition;
|
|
}
|
|
|
|
reference
|
|
operator*() const
|
|
{
|
|
return *get();
|
|
}
|
|
|
|
#if 0
|
|
// An iterator really deserves this, but some compilers (notably IBM VisualAge for OS/2)
|
|
// don't like this when |CharT| is a type without members.
|
|
pointer
|
|
operator->() const
|
|
{
|
|
return get();
|
|
}
|
|
#endif
|
|
|
|
self_type&
|
|
operator++()
|
|
{
|
|
++mPosition;
|
|
return *this;
|
|
}
|
|
|
|
self_type
|
|
operator++( int )
|
|
{
|
|
self_type result(*this);
|
|
++mPosition;
|
|
return result;
|
|
}
|
|
|
|
self_type&
|
|
operator--()
|
|
{
|
|
--mPosition;
|
|
return *this;
|
|
}
|
|
|
|
self_type
|
|
operator--( int )
|
|
{
|
|
self_type result(*this);
|
|
--mPosition;
|
|
return result;
|
|
}
|
|
|
|
difference_type
|
|
size_forward() const
|
|
{
|
|
return mEnd - mPosition;
|
|
}
|
|
|
|
difference_type
|
|
size_backward() const
|
|
{
|
|
return mPosition - mStart;
|
|
}
|
|
|
|
self_type&
|
|
advance( difference_type n )
|
|
{
|
|
if (n > 0)
|
|
{
|
|
difference_type step = NS_MIN(n, size_forward());
|
|
|
|
NS_ASSERTION(step>0, "can't advance a writing iterator beyond the end of a string");
|
|
|
|
mPosition += step;
|
|
}
|
|
else if (n < 0)
|
|
{
|
|
difference_type step = NS_MAX(n, -size_backward());
|
|
|
|
NS_ASSERTION(step<0, "can't advance (backward) a writing iterator beyond the end of a string");
|
|
|
|
mPosition += step;
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
PRUint32
|
|
write( const value_type* s, PRUint32 n )
|
|
{
|
|
NS_ASSERTION(size_forward() > 0, "You can't |write| into an |nsWritingIterator| with no space!");
|
|
|
|
nsCharTraits<value_type>::move(mPosition, s, n);
|
|
advance( difference_type(n) );
|
|
return n;
|
|
}
|
|
};
|
|
|
|
template <class CharT>
|
|
inline
|
|
PRBool
|
|
operator==( const nsReadingIterator<CharT>& lhs, const nsReadingIterator<CharT>& rhs )
|
|
{
|
|
return lhs.get() == rhs.get();
|
|
}
|
|
|
|
template <class CharT>
|
|
inline
|
|
PRBool
|
|
operator!=( const nsReadingIterator<CharT>& lhs, const nsReadingIterator<CharT>& rhs )
|
|
{
|
|
return lhs.get() != rhs.get();
|
|
}
|
|
|
|
|
|
//
|
|
// |nsWritingIterator|s
|
|
//
|
|
|
|
template <class CharT>
|
|
inline
|
|
PRBool
|
|
operator==( const nsWritingIterator<CharT>& lhs, const nsWritingIterator<CharT>& rhs )
|
|
{
|
|
return lhs.get() == rhs.get();
|
|
}
|
|
|
|
template <class CharT>
|
|
inline
|
|
PRBool
|
|
operator!=( const nsWritingIterator<CharT>& lhs, const nsWritingIterator<CharT>& rhs )
|
|
{
|
|
return lhs.get() != rhs.get();
|
|
}
|
|
|
|
#endif /* !defined(nsStringIterator_h___) */
|