mirror of
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688 lines
23 KiB
C++
688 lines
23 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 Netscape 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/NPL/
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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.org code.
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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) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Original Author:
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* Scott Collins <scc@mozilla.org>
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*
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* Contributor(s):
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*/
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#ifndef _nsAWritableString_h__
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#define _nsAWritableString_h__
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// See also...
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#include "nsAReadableString.h"
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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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PRUint32 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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template <class CharT> class basic_nsAWritableString;
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template <class CharT>
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class nsWritingIterator
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// : public bidirectional_iterator_tag
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{
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public:
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typedef ptrdiff_t difference_type;
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typedef CharT value_type;
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typedef CharT* pointer;
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typedef CharT& reference;
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// typedef bidirectional_iterator_tag iterator_category;
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private:
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friend class basic_nsAWritableString<CharT>;
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nsWritableFragment<CharT> mFragment;
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CharT* mPosition;
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basic_nsAWritableString<CharT>* mOwningString;
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inline void normalize_forward();
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inline void normalize_backward();
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nsWritingIterator( nsWritableFragment<CharT>& aFragment,
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CharT* aStartingPosition,
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basic_nsAWritableString<CharT>& aOwningString )
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: mFragment(aFragment),
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mPosition(aStartingPosition),
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mOwningString(&aOwningString)
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{
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// nothing else to do here
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}
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public:
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// nsWritingIterator( const nsWritingIterator<CharT>& ); ...use default copy-constructor
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// nsWritingIterator<CharT>& operator=( const nsWritingIterator<CharT>& ); ...use default copy-assignment operator
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reference
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operator*() const
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{
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return *mPosition;
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}
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pointer
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operator->() const
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{
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return mPosition;
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}
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nsWritingIterator<CharT>&
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operator++()
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{
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++mPosition;
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normalize_forward();
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return *this;
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}
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nsWritingIterator<CharT>
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operator++( int )
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{
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nsWritingIterator<CharT> result(*this);
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++mPosition;
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normalize_forward();
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return result;
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}
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nsWritingIterator<CharT>&
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operator--()
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{
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normalize_backward();
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--mPosition;
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return *this;
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}
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nsWritingIterator<CharT>
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operator--( int )
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{
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nsWritingIterator<CharT> result(*this);
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normalize_backward();
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--mPosition;
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return result;
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}
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const nsWritableFragment<CharT>&
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fragment() const
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{
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return mFragment;
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}
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difference_type
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size_forward() const
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{
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return mFragment.mEnd - mPosition;
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}
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difference_type
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size_backward() const
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{
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return mPosition - mFragment.mStart;
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}
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nsWritingIterator<CharT>&
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operator+=( difference_type n )
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{
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if ( n < 0 )
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return operator-=(-n);
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while ( n )
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{
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difference_type one_hop = NS_MIN(n, size_forward());
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NS_ASSERTION(one_hop>0, "Infinite loop: can't advance a writable iterator beyond the end of a string");
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mPosition += one_hop;
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normalize_forward();
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n -= one_hop;
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}
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return *this;
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}
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nsWritingIterator<CharT>&
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operator-=( difference_type n )
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{
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if ( n < 0 )
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return operator+=(-n);
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while ( n )
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{
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difference_type one_hop = NS_MIN(n, size_backward());
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NS_ASSERTION(one_hop>0, "Infinite loop: can't advance (backward) a writable iterator beyond the end of a string");
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mPosition -= one_hop;
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normalize_backward();
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n -= one_hop;
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}
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return *this;
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}
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PRUint32
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write( const value_type* s, PRUint32 n )
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{
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NS_ASSERTION(size_forward() > 0, "You can't |write| into an |nsWritingIterator| with no space!");
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n = NS_MIN(n, PRUint32(size_forward()));
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nsCharTraits<value_type>::copy(mPosition, s, n);
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operator+=( difference_type(n) );
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return n;
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}
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};
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/*
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This file defines the abstract interfaces |nsAWritableString| and
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|nsAWritableCString|.
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|nsAWritableString| is a string of |PRUnichar|s. |nsAWritableCString| (note the
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'C') is a string of |char|s.
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*/
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template <class CharT>
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class basic_nsAWritableString
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: public basic_nsAReadableString<CharT>
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/*
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...
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*/
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{
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// friend class nsWritingIterator<CharT>;
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public:
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typedef PRUint32 size_type;
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typedef PRUint32 index_type;
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typedef nsWritingIterator<CharT> iterator;
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virtual CharT* GetWritableFragment( nsWritableFragment<CharT>&, nsFragmentRequest, PRUint32 = 0 ) = 0;
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nsWritingIterator<CharT>
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BeginWriting( PRUint32 aOffset = 0 )
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{
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nsWritableFragment<CharT> fragment;
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CharT* startPos = GetWritableFragment(fragment, kFragmentAt, aOffset);
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return nsWritingIterator<CharT>(fragment, startPos, *this);
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}
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nsWritingIterator<CharT>
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EndWriting( PRUint32 aOffset = 0 )
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{
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nsWritableFragment<CharT> fragment;
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CharT* startPos = GetWritableFragment(fragment, kFragmentAt, NS_MAX(0U, this->Length()-aOffset));
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return nsWritingIterator<CharT>(fragment, startPos, *this);
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}
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virtual void SetCapacity( PRUint32 ) = 0;
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virtual void SetLength( PRUint32 ) = 0;
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void
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Truncate( PRUint32 aNewLength=0 )
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{
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NS_ASSERTION(aNewLength<=this->Length(), "Can't use |Truncate()| to make a string longer.");
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if ( aNewLength < this->Length() )
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SetLength(aNewLength);
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}
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// PRBool SetCharAt( char_type, index_type ) = 0;
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// void ToLowerCase();
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// void ToUpperCase();
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// void StripChars( const CharT* aSet );
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// void StripChar( ... );
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// void StripWhitespace();
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// void ReplaceChar( ... );
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// void ReplaceSubstring( ... );
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// void Trim( ... );
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// void CompressSet( ... );
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// void CompressWhitespace( ... );
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//
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// |Assign()|, |operator=()|
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//
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void Assign( const basic_nsAReadableString<CharT>& aReadable ) { do_AssignFromReadable(aReadable); }
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void Assign( const nsPromiseReadable<CharT>& aReadable ) { aReadable.Promises(*this) ? AssignFromPromise(aReadable) : do_AssignFromReadable(aReadable); }
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// void Assign( const nsReadingIterator<CharT>& aStart, const nsReadingIterator<CharT>& aEnd ) { do_AssignFromIterators(aStart, aEnd); }
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void Assign( const CharT* aPtr ) { aPtr ? do_AssignFromElementPtr(aPtr) : SetLength(0); }
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void Assign( const CharT* aPtr, PRUint32 aLength ) { do_AssignFromElementPtrLength(aPtr, aLength); }
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void Assign( CharT aChar ) { do_AssignFromElement(aChar); }
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basic_nsAWritableString<CharT>& operator=( const basic_nsAReadableString<CharT>& aReadable ) { Assign(aReadable); return *this; }
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basic_nsAWritableString<CharT>& operator=( const nsPromiseReadable<CharT>& aReadable ) { Assign(aReadable); return *this; }
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basic_nsAWritableString<CharT>& operator=( const CharT* aPtr ) { Assign(aPtr); return *this; }
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basic_nsAWritableString<CharT>& operator=( CharT aChar ) { Assign(aChar); return *this; }
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//
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// |Append()|, |operator+=()|
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//
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void Append( const basic_nsAReadableString<CharT>& aReadable ) { do_AppendFromReadable(aReadable); }
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void Append( const nsPromiseReadable<CharT>& aReadable ) { aReadable.Promises(*this) ? AppendFromPromise(aReadable) : do_AppendFromReadable(aReadable); }
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// void Append( const nsReadingIterator<CharT>& aStart, const nsReadingIterator<CharT>& aEnd ) { do_AppendFromIterators(aStart, aEnd); }
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void Append( const CharT* aPtr ) { if (aPtr) do_AppendFromElementPtr(aPtr); }
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void Append( const CharT* aPtr, PRUint32 aLength ) { do_AppendFromElementPtrLength(aPtr, aLength); }
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void Append( CharT aChar ) { do_AppendFromElement(aChar); }
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basic_nsAWritableString<CharT>& operator+=( const basic_nsAReadableString<CharT>& aReadable ) { Append(aReadable); return *this; }
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basic_nsAWritableString<CharT>& operator+=( const nsPromiseReadable<CharT>& aReadable ) { Append(aReadable); return *this; }
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basic_nsAWritableString<CharT>& operator+=( const CharT* aPtr ) { Append(aPtr); return *this; }
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basic_nsAWritableString<CharT>& operator+=( CharT aChar ) { Append(aChar); return *this; }
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//
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// |Insert()|
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// Note: I would really like to move the |atPosition| parameter to the front of the argument list
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//
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void Insert( const basic_nsAReadableString<CharT>& aReadable, PRUint32 atPosition ) { do_InsertFromReadable(aReadable, atPosition); }
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void Insert( const nsPromiseReadable<CharT>& aReadable, PRUint32 atPosition ) { aReadable.Promises(*this) ? InsertFromPromise(aReadable, atPosition) : do_InsertFromReadable(aReadable, atPosition); }
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// void Insert( const nsReadingIterator<CharT>& aStart, const nsReadingIterator<CharT>& aEnd, PRUint32 atPosition ) { do_InsertFromIterators(aStart, aEnd, atPosition); }
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void Insert( const CharT* aPtr, PRUint32 atPosition ) { if (aPtr) do_InsertFromElementPtr(aPtr, atPosition); }
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void Insert( const CharT* aPtr, PRUint32 atPosition, PRUint32 aLength ) { do_InsertFromElementPtrLength(aPtr, atPosition, aLength); }
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void Insert( CharT aChar, PRUint32 atPosition ) { do_InsertFromElement(aChar, atPosition); }
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virtual void Cut( PRUint32 cutStart, PRUint32 cutLength );
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void Replace( PRUint32 cutStart, PRUint32 cutLength, const basic_nsAReadableString<CharT>& aReadable ) { do_ReplaceFromReadable(cutStart, cutLength, aReadable); }
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void Replace( PRUint32 cutStart, PRUint32 cutLength, const nsPromiseReadable<CharT>& aReadable ) { aReadable.Promises(*this) ? ReplaceFromPromise(cutStart, cutLength, aReadable) : do_ReplaceFromReadable(cutStart, cutLength, aReadable); }
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// void Replace( PRUint32, PRUint32, const nsReadingIterator<CharT>&, const nsReadingIterator<CharT>& );
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// void Replace( PRUint32, PRUint32, const CharT* );
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// void Replace( PRUint32, PRUint32, const CharT*, PRUint32 );
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// void Replace( PRUint32, PRUint32, CharT );
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private:
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typedef typename nsCharTraits<CharT>::incompatible_char_type incompatible_char_type;
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// NOT TO BE IMPLEMENTED
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void operator= ( incompatible_char_type );
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void Assign ( incompatible_char_type );
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void operator+= ( incompatible_char_type );
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void Append ( incompatible_char_type );
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void Insert ( incompatible_char_type, PRUint32 );
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// void Replace ( PRUint32, PRUint32, incompatible_char_type );
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protected:
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virtual void do_AssignFromReadable( const basic_nsAReadableString<CharT>& );
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void AssignFromPromise( const nsPromiseReadable<CharT>& );
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// virtual void do_AssignFromIterators( nsReadingIterator<CharT>, nsReadingIterator<CharT> );
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virtual void do_AssignFromElementPtr( const CharT* );
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virtual void do_AssignFromElementPtrLength( const CharT*, PRUint32 );
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virtual void do_AssignFromElement( CharT );
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virtual void do_AppendFromReadable( const basic_nsAReadableString<CharT>& );
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void AppendFromPromise( const nsPromiseReadable<CharT>& );
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// virtual void do_AppendFromIterators( nsReadingIterator<CharT>, nsReadingIterator<CharT> );
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virtual void do_AppendFromElementPtr( const CharT* );
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virtual void do_AppendFromElementPtrLength( const CharT*, PRUint32 );
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virtual void do_AppendFromElement( CharT );
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virtual void do_InsertFromReadable( const basic_nsAReadableString<CharT>&, PRUint32 );
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void InsertFromPromise( const nsPromiseReadable<CharT>&, PRUint32 );
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// virtual void do_InsertFromIterators( nsReadingIterator<CharT>, nsReadingIterator<CharT>, PRUint32 );
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virtual void do_InsertFromElementPtr( const CharT*, PRUint32 );
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virtual void do_InsertFromElementPtrLength( const CharT*, PRUint32, PRUint32 );
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virtual void do_InsertFromElement( CharT, PRUint32 );
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virtual void do_ReplaceFromReadable( PRUint32, PRUint32, const basic_nsAReadableString<CharT>& );
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void ReplaceFromPromise( PRUint32 cutStart, PRUint32 cutLength, const nsPromiseReadable<CharT>& );
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// virtual void do_ReplaceFromIterators( ... );
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// virtual void do_ReplaceFromElementPtr( ... );
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// virtual void do_ReplaceFromElementPtrLength( ... );
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// virtual void do_ReplaceFromElement( ... );
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};
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//
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// |nsWritingIterator|s
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//
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template <class CharT>
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inline
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void
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nsWritingIterator<CharT>::normalize_forward()
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{
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if ( mPosition == mFragment.mEnd )
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if ( mOwningString->GetWritableFragment(mFragment, kNextFragment) )
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mPosition = mFragment.mStart;
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}
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template <class CharT>
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inline
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void
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nsWritingIterator<CharT>::normalize_backward()
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{
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if ( mPosition == mFragment.mStart )
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if ( mOwningString->GetWritableFragment(mFragment, kPrevFragment) )
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mPosition = mFragment.mEnd;
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}
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template <class CharT>
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inline
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PRBool
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operator==( const nsWritingIterator<CharT>& lhs, const nsWritingIterator<CharT>& rhs )
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{
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return lhs.operator->() == rhs.operator->();
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}
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template <class CharT>
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inline
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PRBool
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operator!=( const nsWritingIterator<CharT>& lhs, const nsWritingIterator<CharT>& rhs )
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{
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return lhs.operator->() != rhs.operator->();
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}
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//
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// |Assign()|
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//
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template <class CharT>
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void
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basic_nsAWritableString<CharT>::do_AssignFromReadable( const basic_nsAReadableString<CharT>& rhs )
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{
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SetLength(rhs.Length());
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copy_string(rhs.BeginReading(), rhs.EndReading(), BeginWriting());
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}
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template <class CharT>
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void
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basic_nsAWritableString<CharT>::AssignFromPromise( const nsPromiseReadable<CharT>& aReadable )
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/*
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...this function is only called when a promise that somehow references |this| is assigned _into_ |this|.
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E.g.,
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... writable& w ...
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... readable& r ...
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w = r + w;
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In this example, you can see that unless the characters promised by |w| in |r+w| are resolved before
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anything starts getting copied into |w|, there will be trouble. They will be overritten by the contents
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of |r| before being retrieved to be appended.
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We could have a really tricky solution where we tell the promise to resolve _just_ the data promised
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by |this|, but this should be a rare case, since clients with more local knowledge will know that, e.g.,
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in the case above, |Insert| could have special behavior with significantly better performance. Since
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it's a rare case anyway, we should just do the simplest thing that could possibly work, resolve the
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entire promise. If we measure and this turns out to show up on performance radar, we then have the
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option to fix either the callers or this mechanism.
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*/
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{
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PRUint32 length = aReadable.Length();
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if ( CharT* buffer = new CharT[length] )
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{
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// Note: not exception safe. We need something to manage temporary buffers like this
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copy_string(aReadable.BeginReading(), aReadable.EndReading(), buffer);
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do_AssignFromElementPtrLength(buffer, length);
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delete buffer;
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}
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// else assert?
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}
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#if 0
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template <class CharT>
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void
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basic_nsAWritableString<CharT>::do_AssignFromIterators( const nsReadingIterator<CharT>& aStart, const nsReadingIterator<CharT>& aEnd )
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{
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SetLength(distance(aStart, aEnd));
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copy_string(aStart, aEnd, BeginWriting());
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}
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#endif
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template <class CharT>
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void
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basic_nsAWritableString<CharT>::do_AssignFromElementPtr( const CharT* aPtr )
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{
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do_AssignFromReadable(basic_nsLiteralString<CharT>(aPtr));
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}
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template <class CharT>
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void
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basic_nsAWritableString<CharT>::do_AssignFromElementPtrLength( const CharT* aPtr, PRUint32 aLength )
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{
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do_AssignFromReadable(basic_nsLiteralString<CharT>(aPtr, aLength));
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}
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template <class CharT>
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void
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basic_nsAWritableString<CharT>::do_AssignFromElement( CharT aChar )
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{
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do_AssignFromReadable(basic_nsLiteralChar<CharT>(aChar));
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}
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//
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// |Append()|
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//
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template <class CharT>
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void
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basic_nsAWritableString<CharT>::do_AppendFromReadable( const basic_nsAReadableString<CharT>& rhs )
|
|
{
|
|
PRUint32 oldLength = this->Length();
|
|
SetLength(oldLength + rhs.Length());
|
|
copy_string(rhs.BeginReading(), rhs.EndReading(), BeginWriting(oldLength));
|
|
}
|
|
|
|
template <class CharT>
|
|
void
|
|
basic_nsAWritableString<CharT>::AppendFromPromise( const nsPromiseReadable<CharT>& aReadable )
|
|
{
|
|
PRUint32 length = aReadable.Length();
|
|
if ( CharT* buffer = new CharT[length] )
|
|
{
|
|
copy_string(aReadable.BeginReading(), aReadable.EndReading(), buffer);
|
|
do_AppendFromElementPtrLength(buffer, length);
|
|
delete buffer;
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
template <class CharT>
|
|
void
|
|
basic_nsAWritableString<CharT>::do_AppendFromIterators( const nsReadingIterator<CharT>& aStart, const nsReadingIterator<CharT>& aEnd )
|
|
{
|
|
PRUint32 oldLength = this->Length();
|
|
SetLength(oldLength + distance(aStart, aEnd));
|
|
copy_string(aStart, aEnd, BeginWriting(oldLength));
|
|
}
|
|
#endif
|
|
|
|
template <class CharT>
|
|
void
|
|
basic_nsAWritableString<CharT>::do_AppendFromElementPtr( const CharT* aChar )
|
|
{
|
|
do_AppendFromReadable(basic_nsLiteralString<CharT>(aChar));
|
|
}
|
|
|
|
template <class CharT>
|
|
void
|
|
basic_nsAWritableString<CharT>::do_AppendFromElementPtrLength( const CharT* aChar, PRUint32 aLength )
|
|
{
|
|
do_AppendFromReadable(basic_nsLiteralString<CharT>(aChar, aLength));
|
|
}
|
|
|
|
template <class CharT>
|
|
inline
|
|
void
|
|
basic_nsAWritableString<CharT>::do_AppendFromElement( CharT aChar )
|
|
{
|
|
PRUint32 oldLength = this->Length();
|
|
SetLength(oldLength+1);
|
|
nsWritableFragment<CharT> fragment;
|
|
*GetWritableFragment(fragment, kFragmentAt, oldLength) = aChar;
|
|
}
|
|
|
|
|
|
|
|
//
|
|
// |Insert()|
|
|
//
|
|
|
|
template <class CharT>
|
|
void
|
|
basic_nsAWritableString<CharT>::do_InsertFromReadable( const basic_nsAReadableString<CharT>& aReadable, PRUint32 atPosition )
|
|
{
|
|
PRUint32 oldLength = this->Length();
|
|
SetLength(oldLength + aReadable.Length());
|
|
if ( atPosition < oldLength )
|
|
copy_string_backward(this->BeginReading(atPosition), this->BeginReading(oldLength), EndWriting());
|
|
else
|
|
atPosition = oldLength;
|
|
copy_string(aReadable.BeginReading(), aReadable.EndReading(), BeginWriting(atPosition));
|
|
}
|
|
|
|
template <class CharT>
|
|
void
|
|
basic_nsAWritableString<CharT>::InsertFromPromise( const nsPromiseReadable<CharT>& aReadable, PRUint32 atPosition )
|
|
{
|
|
PRUint32 length = aReadable.Length();
|
|
if ( CharT* buffer = new CharT[length] )
|
|
{
|
|
copy_string(aReadable.BeginReading(), aReadable.EndReading(), buffer);
|
|
do_InsertFromElementPtrLength(buffer, atPosition, length);
|
|
delete buffer;
|
|
}
|
|
}
|
|
|
|
template <class CharT>
|
|
void
|
|
basic_nsAWritableString<CharT>::do_InsertFromElementPtr( const CharT* aPtr, PRUint32 atPosition )
|
|
{
|
|
do_InsertFromReadable(basic_nsLiteralString<CharT>(aPtr), atPosition);
|
|
}
|
|
|
|
template <class CharT>
|
|
void
|
|
basic_nsAWritableString<CharT>::do_InsertFromElementPtrLength( const CharT* aPtr, PRUint32 atPosition, PRUint32 aLength )
|
|
{
|
|
do_InsertFromReadable(basic_nsLiteralString<CharT>(aPtr, aLength), atPosition);
|
|
}
|
|
|
|
template <class CharT>
|
|
void
|
|
basic_nsAWritableString<CharT>::do_InsertFromElement( CharT aChar, PRUint32 atPosition )
|
|
{
|
|
do_InsertFromReadable(basic_nsLiteralChar<CharT>(aChar), atPosition);
|
|
}
|
|
|
|
|
|
|
|
//
|
|
// |Cut()|
|
|
//
|
|
|
|
template <class CharT>
|
|
void
|
|
basic_nsAWritableString<CharT>::Cut( PRUint32 cutStart, PRUint32 cutLength )
|
|
{
|
|
PRUint32 myLength = this->Length();
|
|
cutLength = NS_MIN(cutLength, myLength-cutStart);
|
|
PRUint32 cutEnd = cutStart + cutLength;
|
|
if ( cutEnd < myLength )
|
|
copy_string(this->BeginReading(cutEnd), this->EndReading(), BeginWriting(cutStart));
|
|
SetLength(myLength-cutLength);
|
|
}
|
|
|
|
|
|
|
|
//
|
|
// |Replace()|
|
|
//
|
|
|
|
template <class CharT>
|
|
void
|
|
basic_nsAWritableString<CharT>::do_ReplaceFromReadable( PRUint32 cutStart, PRUint32 cutLength, const basic_nsAReadableString<CharT>& aReplacement )
|
|
{
|
|
PRUint32 oldLength = this->Length();
|
|
|
|
cutStart = NS_MIN(cutStart, oldLength);
|
|
cutLength = NS_MIN(cutLength, oldLength-cutStart);
|
|
PRUint32 cutEnd = cutStart + cutLength;
|
|
|
|
PRUint32 replacementLength = aReplacement.Length();
|
|
PRUint32 replacementEnd = cutStart + replacementLength;
|
|
|
|
PRUint32 newLength = oldLength - cutLength + replacementLength;
|
|
|
|
if ( cutLength > replacementLength )
|
|
copy_string(this->BeginReading(cutEnd), this->EndReading(), BeginWriting(replacementEnd));
|
|
SetLength(newLength);
|
|
if ( cutLength < replacementLength )
|
|
copy_string_backward(this->BeginReading(cutEnd), this->BeginReading(oldLength), BeginWriting(replacementEnd));
|
|
|
|
copy_string(aReplacement.BeginReading(), aReplacement.EndReading(), BeginWriting(cutStart));
|
|
}
|
|
|
|
template <class CharT>
|
|
void
|
|
basic_nsAWritableString<CharT>::ReplaceFromPromise( PRUint32 cutStart, PRUint32 cutLength, const nsPromiseReadable<CharT>& aReadable )
|
|
{
|
|
PRUint32 length = aReadable.Length();
|
|
if ( CharT* buffer = new CharT[length] )
|
|
{
|
|
copy_string(aReadable.BeginReading(), aReadable.EndReading(), buffer);
|
|
do_ReplaceFromReadable(cutStart, cutLength, basic_nsLiteralString<CharT>(buffer, length));
|
|
delete buffer;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
//
|
|
// Types
|
|
//
|
|
|
|
typedef basic_nsAWritableString<PRUnichar> nsAWritableString;
|
|
typedef basic_nsAWritableString<char> nsAWritableCString;
|
|
|
|
#endif // !defined(_nsAWritableString_h__)
|