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477 lines
14 KiB
477 lines
14 KiB
/*
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* This file is part of the KDE libraries
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* Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
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* Copyright (C) 2003 Apple Computer, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef _KJS_USTRING_H_
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#define _KJS_USTRING_H_
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#include <tqstring.h>
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#include "global.h"
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/**
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* @internal
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*/
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namespace DOM {
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class DOMString;
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}
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class KJScript;
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class TQString;
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class TQConstString;
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namespace KJS {
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class UCharReference;
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class UString;
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/**
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* @short Unicode character.
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*
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* UChar represents a 16 bit Unicode character. It's internal data
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* representation is compatible to XChar2b and TQChar. It's therefore
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* possible to exchange data with X and Qt with shallow copies.
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*/
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struct KJS_EXPORT UChar {
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/**
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* Construct a character with uninitialized value.
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*/
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UChar();
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UChar(char u);
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UChar(unsigned char u);
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/**
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* Construct a character with the value denoted by the arguments.
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* @param h higher byte
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* @param l lower byte
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*/
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UChar(unsigned char h , unsigned char l);
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/**
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* Construct a character with the given value.
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* @param u 16 bit Unicode value
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*/
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UChar(unsigned short u);
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UChar(const UCharReference &c);
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/**
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* @return The higher byte of the character.
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*/
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unsigned char high() const { return uc >> 8; }
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/**
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* @return The lower byte of the character.
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*/
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unsigned char low() const { return uc; }
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/**
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* @return the 16 bit Unicode value of the character
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*/
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unsigned short unicode() const { return uc; }
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public:
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/**
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* @return The character converted to lower case.
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*/
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UChar toLower() const;
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/**
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* @return The character converted to upper case.
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*/
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UChar toUpper() const;
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/**
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* A static instance of UChar(0).
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*/
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static UChar null;
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unsigned short uc;
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} KJS_PACKED;
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inline UChar::UChar() { }
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inline UChar::UChar(unsigned char h , unsigned char l) : uc(h << 8 | l) { }
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inline UChar::UChar(char u) : uc((unsigned char)u) { }
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inline UChar::UChar(unsigned char u) : uc(u) { }
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inline UChar::UChar(unsigned short u) : uc(u) { }
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/**
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* @short Dynamic reference to a string character.
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*
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* UCharReference is the dynamic counterpart of UChar. It's used when
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* characters retrieved via index from a UString are used in an
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* assignment expression (and therefore can't be treated as being const):
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* \code
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* UString s("hello world");
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* s[0] = 'H';
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* \endcode
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*
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* If that sounds confusing your best bet is to simply forget about the
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* existence of this class and treat is as being identical to UChar.
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*/
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class KJS_EXPORT UCharReference {
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friend class UString;
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UCharReference(UString *s, unsigned int off) : str(s), offset(off) { }
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public:
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/**
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* Set the referenced character to c.
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*/
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UCharReference& operator=(UChar c);
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/**
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* Same operator as above except the argument that it takes.
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*/
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UCharReference& operator=(char c) { return operator=(UChar(c)); }
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/**
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* @return Unicode value.
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*/
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unsigned short unicode() const { return ref().uc; }
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/**
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* @return Lower byte.
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*/
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unsigned char low() const { return ref().uc; }
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/**
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* @return Higher byte.
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*/
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unsigned char high() const { return ref().uc >> 8; }
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/**
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* @return Character converted to lower case.
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*/
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UChar toLower() const { return ref().toLower(); }
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/**
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* @return Character converted to upper case.
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*/
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UChar toUpper() const { return ref().toUpper(); }
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private:
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// not implemented, can only be constructed from UString
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UCharReference();
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UChar& ref() const;
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UString *str;
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int offset;
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};
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inline UChar::UChar(const UCharReference &c) : uc(c.unicode()) { }
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/**
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* @short 8 bit char based string class
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*/
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class KJS_EXPORT CString {
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public:
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CString() : data(0L), length(0) { }
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CString(const char *c);
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CString(const char *c, int len);
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CString(const CString &);
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~CString();
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CString &append(const CString &);
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CString &operator=(const char *c);
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CString &operator=(const CString &);
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CString &operator+=(const CString &c) { return append(c); }
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int size() const { return length; }
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const char *c_str() const { return data; }
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private:
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char *data;
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int length;
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};
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/**
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* @short Unicode string class
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*/
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class KJS_EXPORT UString {
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friend bool operator==(const UString&, const UString&);
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friend class UCharReference;
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friend class Identifier;
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friend class PropertyMap;
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friend class PropertyMapHashTableEntry;
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/**
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* @internal
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*/
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struct KJS_EXPORT Rep {
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friend class UString;
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friend bool operator==(const UString&, const UString&);
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static Rep *create(UChar *d, int l);
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void destroy();
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UChar *data() const { return dat; }
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int size() const { return len; }
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unsigned hash() const { if (_hash == 0) _hash = computeHash(dat, len); return _hash; }
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static unsigned computeHash(const UChar *, int length);
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static unsigned computeHash(const char *);
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void ref() { ++rc; }
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void deref() { if (--rc == 0) destroy(); }
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UChar *dat;
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int len;
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int capacity;
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int rc;
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mutable unsigned _hash;
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enum { capacityForIdentifier = 0x10000000 };
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static Rep null;
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static Rep empty;
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};
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public:
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/**
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* Constructs a null string.
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*/
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UString();
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/**
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* Constructs a string from the single character c.
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*/
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explicit UString(char c);
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/**
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* Constructs a string from a classical zero determined char string.
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*/
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UString(const char *c);
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/**
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* Constructs a string from an array of Unicode characters of the specified
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* length.
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*/
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UString(const UChar *c, int length);
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/**
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* If copy is false the string data will be adopted.
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* That means that the data will NOT be copied and the pointer will
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* be deleted when the UString object is modified or destroyed.
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* Behaviour defaults to a deep copy if copy is true.
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*/
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UString(UChar *c, int length, bool copy);
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/**
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* Copy constructor. Makes a shallow copy only.
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*/
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UString(const UString &s) { attach(s.rep); }
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/**
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* Convenience declaration only ! You'll be on your own to write the
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* implementation for a construction from TQString.
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*
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* Note: feel free to contact me if you want to see a dummy header for
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* your favorite FooString class here !
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*/
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UString(const TQString &);
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/**
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* Convenience declaration only ! See UString(const TQString&).
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*/
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UString(const DOM::DOMString &);
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/**
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* Concatenation constructor. Makes operator+ more efficient.
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*/
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UString(const UString &, const UString &);
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/**
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* Destructor. If this handle was the only one holding a reference to the
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* string the data will be freed.
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*/
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~UString() { release(); }
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/**
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* Constructs a string from an int.
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*/
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static UString from(int i);
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/**
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* Constructs a string from an unsigned int.
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*/
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static UString from(unsigned int u);
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/**
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* Constructs a string from a long.
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*/
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static UString from(long l);
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/**
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* Constructs a string from a double.
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*/
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static UString from(double d);
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/**
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* Append another string.
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*/
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UString &append(const UString &);
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/**
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* @return The string converted to the 8-bit string type CString().
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*/
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CString cstring() const;
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/**
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* Convert the Unicode string to plain ASCII chars chopping of any higher
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* bytes. This method should only be used for *debugging* purposes as it
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* is neither Unicode safe nor free from side effects. In order not to
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* waste any memory the char buffer is static and *shared* by all UString
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* instances.
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*/
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char *ascii() const;
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/**
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* @see UString(const TQString&).
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*/
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DOM::DOMString string() const;
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/**
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* @see UString(const TQString&).
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*/
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TQString qstring() const;
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/**
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* @see UString(const TQString&).
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*/
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TQConstString qconststring() const;
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/**
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* Assignment operator.
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*/
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UString &operator=(const char *c);
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UString &operator=(const UString &);
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/**
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* Appends the specified string.
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*/
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UString &operator+=(const UString &s) { return append(s); }
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/**
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* @return A pointer to the internal Unicode data.
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*/
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const UChar* data() const { return rep->data(); }
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/**
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* @return True if null.
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*/
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bool isNull() const { return (rep == &Rep::null); }
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/**
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* @return True if null or zero length.
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*/
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bool isEmpty() const { return (!rep->len); }
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/**
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* Use this if you want to make sure that this string is a plain ASCII
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* string. For example, if you don't want to lose any information when
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* using cstring() or ascii().
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*
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* @return True if the string doesn't contain any non-ASCII characters.
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*/
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bool is8Bit() const;
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/**
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* @return The length of the string.
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*/
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int size() const { return rep->size(); }
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/**
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* Const character at specified position.
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*/
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UChar operator[](int pos) const;
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/**
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* Writable reference to character at specified position.
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*/
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UCharReference operator[](int pos);
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/**
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* Attempts an conversion to a number. Apart from floating point numbers,
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* the algorithm will recognize hexadecimal representations (as
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* indicated by a 0x or 0X prefix) and +/- Infinity.
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* Returns NaN if the conversion failed.
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* @param tolerateTrailingJunk if true, toDouble can tolerate garbage after the number.
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* @param tolerateEmptyString if false, toDouble will turn an empty string into NaN rather than 0.
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*/
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double toDouble(bool tolerateTrailingJunk, bool tolerateEmptyString) const;
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double toDouble(bool tolerateTrailingJunk) const;
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double toDouble() const;
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/**
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* Attempts an conversion to an unsigned long integer. ok will be set
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* according to the success.
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@ @param ok make this point to a bool in case you need to know whether the conversion succeeded.
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* @param tolerateEmptyString if false, toULong will return false for *ok for an empty string.
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*/
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unsigned long toULong(bool *ok, bool tolerateEmptyString) const;
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unsigned long toULong(bool *ok = 0) const;
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unsigned int toUInt32(bool *ok = 0) const;
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unsigned int toStrictUInt32(bool *ok = 0) const;
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/**
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* Attempts an conversion to an array index. The "ok" boolean will be set
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* to true if it is a valid array index according to the rule from
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* ECMA 15.2 about what an array index is. It must exactly match the string
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* form of an unsigned integer, and be less than 2^32 - 1.
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*/
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unsigned toArrayIndex(bool *ok = 0) const;
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/**
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* Returns this string converted to lower case characters
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*/
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UString toLower() const;
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/**
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* Returns this string converted to upper case characters
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*/
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UString toUpper() const;
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/**
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* @return Position of first occurrence of f starting at position pos.
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* -1 if the search was not successful.
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*/
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int find(const UString &f, int pos = 0) const;
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int find(UChar, int pos = 0) const;
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/**
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* @return Position of first occurrence of f searching backwards from
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* position pos.
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* -1 if the search was not successful.
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*/
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int rfind(const UString &f, int pos) const;
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int rfind(UChar, int pos) const;
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/**
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* @return The sub string starting at position pos and length len.
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*/
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UString substr(int pos = 0, int len = -1) const;
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/**
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* Static instance of a null string.
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*/
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static UString null;
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#ifdef KJS_DEBUG_MEM
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/**
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* Clear statically allocated resources.
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*/
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static void globalClear();
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#endif
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private:
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UString(Rep *r) { attach(r); }
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void attach(Rep *r);
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void detach();
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void release();
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Rep *rep;
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};
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KJS_EXPORT inline bool operator==(const UChar &c1, const UChar &c2) {
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return (c1.uc == c2.uc);
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}
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KJS_EXPORT inline bool operator!=(const UChar& c1, const UChar& c2) {
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return !KJS::operator==(c1, c2);
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}
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KJS_EXPORT bool operator==(const UString& s1, const UString& s2);
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inline bool operator!=(const UString& s1, const UString& s2) {
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return !KJS::operator==(s1, s2);
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}
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KJS_EXPORT bool operator<(const UString& s1, const UString& s2);
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KJS_EXPORT bool operator==(const UString& s1, const char *s2);
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KJS_EXPORT inline bool operator!=(const UString& s1, const char *s2) {
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return !KJS::operator==(s1, s2);
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}
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KJS_EXPORT inline bool operator==(const char *s1, const UString& s2) {
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return operator==(s2, s1);
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}
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KJS_EXPORT inline bool operator!=(const char *s1, const UString& s2) {
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return !KJS::operator==(s1, s2);
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}
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KJS_EXPORT bool operator==(const CString& s1, const CString& s2);
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KJS_EXPORT inline bool operator!=(const CString& s1, const CString& s2) {
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return !KJS::operator==(s1, s2);
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}
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KJS_EXPORT inline UString operator+(const UString& s1, const UString& s2) {
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return UString(s1, s2);
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}
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KJS_EXPORT int compare(const UString &, const UString &);
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} // namespace
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#endif
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