gecko-dev/xpcom/ds/nsString2.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
 * The contents of this file are subject to the Netscape 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/NPL/
 *
 * 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.org code.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 *   Rick Gessner <rickg@netscape.com> (original author)
 *   Scott Collins <scc@mozilla.org>
 */



/***********************************************************************
  MODULE NOTES:

  See nsStr.h for a more general description of string classes.

  This version of the nsString class offers many improvements over the
  original version:
    1. Wide and narrow chars
    2. Allocators
    3. Much smarter autostrings
    4. Subsumable strings
 ***********************************************************************/

#ifndef _nsString_
#define _nsString_

#include "prtypes.h"
#include "nscore.h"
#include <stdio.h>
#include "nsString.h"
#include "nsIAtom.h"
#include "nsStr.h"
#include "nsCRT.h"

#include "nsAWritableString.h"

#ifdef STANDALONE_MI_STRING_TESTS
  class nsAReadableString { public: virtual ~nsAReadableString() { } };
  class nsAWritableString : public nsAReadableString { public: virtual ~nsAWritableString() { } };
#endif

class nsISizeOfHandler;


#define nsString2     nsString
#define nsAutoString2 nsAutoString

class NS_COM nsSubsumeStr;

class NS_COM nsString :
  public nsAWritableString,
  public nsStr {

protected:
  virtual const void* Implementation() const { return "nsString"; }
  virtual const PRUnichar* GetReadableFragment( nsReadableFragment<PRUnichar>&, nsFragmentRequest, PRUint32 ) const;
  virtual PRUnichar* GetWritableFragment( nsWritableFragment<PRUnichar>&, nsFragmentRequest, PRUint32 );


public:
  /**
   * Default constructor. 
   */
  nsString();

  /**
   * This is our copy constructor 
   * @param   reference to another nsString
   */
  nsString(const nsString& aString);   

  explicit nsString(const nsAReadableString&);

  explicit nsString(const PRUnichar*);
  nsString(const PRUnichar*, PRInt32);


  /**
   * This constructor takes a subsumestr
   * @param   reference to subsumestr
   */
#if defined(AIX) || defined(XP_OS2_VACPP)
  explicit nsString(const nsSubsumeStr& aSubsumeStr);   // AIX and VAC++ require a const here
#else
  explicit nsString(nsSubsumeStr& aSubsumeStr);   
#endif

  /**
   * Destructor
   * 
   */
  virtual ~nsString();    

  /**
   * Retrieve the length of this string
   * @return string length
   */
  virtual PRUint32 Length() const { return mLength; }

  /**
   * Retrieve the size of this string
   * @return string length
   */
  virtual void SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const;


  /**
   * Call this method if you want to force a different string length
   * @update  gess7/30/98
   * @param   aLength -- contains new length for mStr
   * @return
   */
  void SetLength(PRUint32 aLength);

  /**
   * Sets the new length of the string.
   * @param   aLength is new string length.
   * @return  nada
   */
  void SetCapacity(PRUint32 aLength);


  /**
   * This method truncates this string to given length.
   *
   * @param   anIndex -- new length of string
   * @return  nada
   */
  void Truncate(PRUint32 anIndex=0) {
    NS_ASSERTION(anIndex<=mLength, "Can't use |Truncate()| to make a string longer.");
    if ( anIndex < mLength )
      SetLength(anIndex);
  }


  /**
   *  Determine whether or not the characters in this
   *  string are in store as 1 or 2 byte (unicode) strings.
   *  
   *  @return  TRUE if ordered.
   */
  PRBool IsUnicode(void) const {
    PRBool result=PRBool(mCharSize==eTwoByte);
    return result;
  }

  /**********************************************************************
    Getters/Setters...
   *********************************************************************/

   /**
     * Retrieve const ptr to internal buffer; DO NOT TRY TO FREE IT!
     */
  const char* GetBuffer(void) const;
  const PRUnichar* GetUnicode(void) const;

   /**
     * Set nth character.
     */
  PRBool SetCharAt(PRUnichar aChar,PRUint32 anIndex);



  /**********************************************************************
    Lexomorphic transforms...
   *********************************************************************/


  /**
   * Converts chars in this to lowercase
   * @update  gess 7/27/98
   */
  void ToLowerCase();


  /**
   * Converts chars in this to lowercase, and
   * stores them in aOut
   * @update  gess 7/27/98
   * @param   aOut is a string to contain result
   */
  void ToLowerCase(nsString& aString) const;

  /**
   * Converts chars in this to uppercase
   * @update  gess 7/27/98
   */
  void ToUpperCase();

  /**
   * Converts chars in this to lowercase, and
   * stores them in a given output string
   * @update  gess 7/27/98
   * @param   aOut is a string to contain result
   */
  void ToUpperCase(nsString& aString) const;


  /**
   *  This method is used to remove all occurances of the
   *  characters found in aSet from this string.
   *  
   *  @param  aSet -- characters to be cut from this
   *  @return *this 
   */
  void StripChars( const char* aSet );
  void StripChar( PRUnichar aChar, PRInt32 anOffset=0 );
  void StripChar( char aChar, PRInt32 anOffset=0 )       { StripChar((PRUnichar) (unsigned char)aChar,anOffset); }
  void StripChar( PRInt32 anInt, PRInt32 anOffset=0 )    { StripChar((PRUnichar)anInt,anOffset); }

  /**
   *  This method strips whitespace throughout the string
   *  
   *  @return  this
   */
  void StripWhitespace();

  /**
   *  swaps occurence of 1 string for another
   *  
   *  @return  this
   */
  void ReplaceChar( PRUnichar anOldChar, PRUnichar aNewChar );
  void ReplaceChar( const char* aSet, PRUnichar aNewChar );

  void ReplaceSubstring( const nsString& aTarget, const nsString& aNewValue );
  void ReplaceSubstring( const PRUnichar* aTarget, const PRUnichar* aNewValue );

  PRInt32 CountChar( PRUnichar aChar ) const;

  /**
   *  This method trims characters found in aTrimSet from
   *  either end of the underlying string.
   *  
   *  @param   aTrimSet -- contains chars to be trimmed from
   *           both ends
   *  @param   aEliminateLeading
   *  @param   aEliminateTrailing
   *  @param   aIgnoreQuotes
   *  @return  this
   */
  void Trim(const char* aSet,PRBool aEliminateLeading=PR_TRUE,PRBool aEliminateTrailing=PR_TRUE,PRBool aIgnoreQuotes=PR_FALSE);

  /**
   *  This method strips whitespace from string.
   *  You can control whether whitespace is yanked from
   *  start and end of string as well.
   *  
   *  @param   aEliminateLeading controls stripping of leading ws
   *  @param   aEliminateTrailing controls stripping of trailing ws
   *  @return  this
   */
  void CompressSet(const char* aSet, PRUnichar aChar,PRBool aEliminateLeading=PR_TRUE,PRBool aEliminateTrailing=PR_TRUE);

  /**
   *  This method strips whitespace from string.
   *  You can control whether whitespace is yanked from
   *  start and end of string as well.
   *  
   *  @param   aEliminateLeading controls stripping of leading ws
   *  @param   aEliminateTrailing controls stripping of trailing ws
   *  @return  this
   */
  void CompressWhitespace( PRBool aEliminateLeading=PR_TRUE,PRBool aEliminateTrailing=PR_TRUE);

  /**********************************************************************
    string conversion methods...
   *********************************************************************/

  /**
   * This method constructs a new nsString is a clone of this string.
   * 
   */
  nsString* ToNewString() const;

  /**
   * Creates an ISOLatin1 clone of this string
   * Note that calls to this method should be matched with calls to Recycle().
   * @return  ptr to new isolatin1 string
   */
  char* ToNewCString() const;

  /**
   * Creates an UTF8 clone of this string
   * Note that calls to this method should be matched with calls to Recycle().
   * @return  ptr to new null-terminated UTF8 string
   */
  char* ToNewUTF8String() const;

  /**
   * Creates a unicode clone of this string
   * Note that calls to this method should be matched with calls to Recycle().
   * @return  ptr to new unicode string
   */
  PRUnichar* ToNewUnicode() const;

  /**
   * Copies data from internal buffer onto given char* buffer
   * NOTE: This only copies as many chars as will fit in given buffer (clips)
   * @param aBuf is the buffer where data is stored
   * @param aBuflength is the max # of chars to move to buffer
   * @return ptr to given buffer
   */
  char* ToCString(char* aBuf,PRUint32 aBufLength,PRUint32 anOffset=0) const;

  /**
   * Perform string to float conversion.
   * @param   aErrorCode will contain error if one occurs
   * @return  float rep of string value
   */
  float ToFloat(PRInt32* aErrorCode) const;

  /**
   * Perform string to int conversion.
   * @param   aErrorCode will contain error if one occurs
   * @param   aRadix tells us which radix to assume; kAutoDetect tells us to determine the radix for you.
   * @return  int rep of string value, and possible (out) error code
   */
  PRInt32   ToInteger(PRInt32* aErrorCode,PRUint32 aRadix=kRadix10) const;


  /**********************************************************************
    String manipulation methods...                
   *********************************************************************/

  /**
   * assign given string to this string
   * @param   aStr: buffer to be assigned to this 
   * @param   aCount is the length of the given str (or -1) if you want me to determine its length
   *  NOTE:   IFF you pass -1 as aCount, then your buffer must be null terminated.

   * @return  this
   */

  nsString& operator=( const nsString& aString )                              { Assign(aString); return *this; }
  nsString& operator=( const nsAReadableString& aReadable )                   { Assign(aReadable); return *this; }
  nsString& operator=( const nsPromiseReadable<PRUnichar>& aReadable )        { Assign(aReadable); return *this; }
  nsString& operator=( const PRUnichar* aPtr )                                { Assign(aPtr); return *this; }
  nsString& operator=( PRUnichar aChar )                                      { Assign(aChar); return *this; }

  void AssignWithConversion(char);
  void AssignWithConversion(const char*);
  void AssignWithConversion(const char*, PRInt32);


  /*
   *  Appends n characters from given string to this,
   *  This version computes the length of your given string
   *  
   *  @param   aString is the source to be appended to this
   *  @return  number of chars copied
   */

  void AppendInt(PRInt32, PRInt32=10); //radix=8,10 or 16
  void AppendFloat(double);
  void AppendWithConversion(const char*, PRInt32=-1);
  void AppendWithConversion(char);

  virtual void do_AppendFromElement( PRUnichar );

             
  /*
   *  Copies n characters from this string to given string,
   *  starting at the leftmost offset.
   *  
   *  
   *  @param   aCopy -- Receiving string
   *  @param   aCount -- number of chars to copy
   *  @return  number of chars copied
   */
  PRUint32 Left(nsString& aCopy,PRInt32 aCount) const;

  /*
   *  Copies n characters from this string to given string,
   *  starting at the given offset.
   *  
   *  
   *  @param   aCopy -- Receiving string
   *  @param   aCount -- number of chars to copy
   *  @param   anOffset -- position where copying begins
   *  @return  number of chars copied
   */
  PRUint32 Mid(nsString& aCopy,PRUint32 anOffset,PRInt32 aCount) const;

  /*
   *  Copies n characters from this string to given string,
   *  starting at rightmost char.
   *  
   *  
   *  @param  aCopy -- Receiving string
   *  @param  aCount -- number of chars to copy
   *  @return number of chars copied
   */
  PRUint32 Right(nsString& aCopy,PRInt32 aCount) const;


//void InsertWithConversion(char);
  void InsertWithConversion(const char*, PRUint32, PRInt32=-1);


  /**********************************************************************
    Searching methods...                
   *********************************************************************/
 
  /**
   *  Search for given substring within this string
   *  
   *  @param   aString is substring to be sought in this
   *  @param   aIgnoreCase selects case sensitivity
   *  @param   anOffset tells us where in this strig to start searching
   *  @param   aCount tells us how many iterations to make starting at the given offset
   *  @return  offset in string, or -1 (kNotFound)
   */
  PRInt32 Find(const nsString& aString,PRBool aIgnoreCase=PR_FALSE,PRInt32 anOffset=0,PRInt32 aCount=-1) const;
  PRInt32 Find(const nsStr& aString,PRBool aIgnoreCase=PR_FALSE,PRInt32 anOffset=0,PRInt32 aCount=-1) const;
  PRInt32 Find(const char* aString,PRBool aIgnoreCase=PR_FALSE,PRInt32 anOffset=0,PRInt32 aCount=-1) const;
  PRInt32 Find(const PRUnichar* aString,PRBool aIgnoreCase=PR_FALSE,PRInt32 anOffset=0,PRInt32 aCount=-1) const;


  /**
   *  Search for given char within this string
   *  
   *  @param   aString is substring to be sought in this
   *  @param   anOffset tells us where in this strig to start searching
   *  @param   aIgnoreCase selects case sensitivity
   *  @param   aCount tells us how many iterations to make starting at the given offset
   *  @return  find pos in string, or -1 (kNotFound)
   */
  //PRInt32 Find(PRUnichar aChar,PRInt32 offset=-1,PRBool aIgnoreCase=PR_FALSE) const;
  PRInt32 FindChar(PRUnichar aChar,PRBool aIgnoreCase=PR_FALSE,PRInt32 anOffset=0,PRInt32 aCount=-1) const;

  /**
   * This method searches this string for the first character
   * found in the given charset
   * @param aString contains set of chars to be found
   * @param anOffset tells us where to start searching in this
   * @return -1 if not found, else the offset in this
   */
  PRInt32 FindCharInSet(const char* aString,PRInt32 anOffset=0) const;
  PRInt32 FindCharInSet(const PRUnichar* aString,PRInt32 anOffset=0) const;
  PRInt32 FindCharInSet(const nsStr& aString,PRInt32 anOffset=0) const;


  /**
   * This methods scans the string backwards, looking for the given string
   * @param   aString is substring to be sought in this
   * @param   aIgnoreCase tells us whether or not to do caseless compare
   * @param   anOffset tells us where in this strig to start searching (counting from left)
   * @param   aCount tells us how many iterations to make starting at the given offset
   * @return  offset in string, or -1 (kNotFound)
   */
  PRInt32 RFind(const char* aCString,PRBool aIgnoreCase=PR_FALSE,PRInt32 anOffset=-1,PRInt32 aCount=-1) const;
  PRInt32 RFind(const nsString& aString,PRBool aIgnoreCase=PR_FALSE,PRInt32 anOffset=-1,PRInt32 aCount=-1) const;
  PRInt32 RFind(const nsStr& aString,PRBool aIgnoreCase=PR_FALSE,PRInt32 anOffset=-1,PRInt32 aCount=-1) const;
  PRInt32 RFind(const PRUnichar* aString,PRBool aIgnoreCase=PR_FALSE,PRInt32 anOffset=-1,PRInt32 aCount=-1) const;


  /**
   *  Search for given char within this string
   *  
   *  @param   aString is substring to be sought in this
   *  @param   anOffset tells us where in this strig to start searching (counting from left)
   *  @param   aIgnoreCase selects case sensitivity
   *  @param   aCount tells us how many iterations to make starting at the given offset
   *  @return  find pos in string, or -1 (kNotFound)
   */
  //PRInt32 RFind(PRUnichar aChar,PRInt32 offset=-1,PRBool aIgnoreCase=PR_FALSE) const;
  PRInt32 RFindChar(PRUnichar aChar,PRBool aIgnoreCase=PR_FALSE,PRInt32 anOffset=-1,PRInt32 aCount=-1) const;

  /**
   * This method searches this string for the last character
   * found in the given string
   * @param aString contains set of chars to be found
   *  @param   anOffset tells us where in this strig to start searching (counting from left)
   * @return -1 if not found, else the offset in this
   */
  PRInt32 RFindCharInSet(const char* aString,PRInt32 anOffset=-1) const;
  PRInt32 RFindCharInSet(const PRUnichar* aString,PRInt32 anOffset=-1) const;
  PRInt32 RFindCharInSet(const nsStr& aString,PRInt32 anOffset=-1) const;


  /**********************************************************************
    Comparison methods...                
   *********************************************************************/

  /**
   * Compares a given string type to this string. 
   * @update  gess 7/27/98
   * @param   S is the string to be compared
   * @param   aIgnoreCase tells us how to treat case
   * @param   aCount tells us how many chars to compare
   * @return  -1,0,1
   */

  PRInt32 CompareWithConversion(const char* aString,PRBool aIgnoreCase=PR_FALSE,PRInt32 aCount=-1) const;
  PRInt32 CompareWithConversion(const nsString& aString,PRBool aIgnoreCase=PR_FALSE,PRInt32 aCount=-1) const;
  PRInt32 CompareWithConversion(const PRUnichar* aString,PRBool aIgnoreCase=PR_FALSE,PRInt32 aCount=-1) const;

  PRBool  EqualsWithConversion(const nsString &aString,PRBool aIgnoreCase=PR_FALSE,PRInt32 aCount=-1) const;
  PRBool  EqualsWithConversion(const char* aString,PRBool aIgnoreCase=PR_FALSE,PRInt32 aCount=-1) const;
  PRBool  EqualsWithConversion(const PRUnichar* aString,PRBool aIgnoreCase=PR_FALSE,PRInt32 aCount=-1) const;
  PRBool  EqualsAtom(/*FIX: const */nsIAtom* anAtom,PRBool aIgnoreCase) const;   

  PRBool  EqualsIgnoreCase(const nsString& aString) const;
  PRBool  EqualsIgnoreCase(const char* aString,PRInt32 aCount=-1) const;
  PRBool  EqualsIgnoreCase(/*FIX: const */nsIAtom *aAtom) const;


  /**
   *  Determine if given buffer is plain ascii
   *  
   *  @param   aBuffer -- if null, then we test *this, otherwise we test given buffer
   *  @return  TRUE if is all ascii chars or if strlen==0
   */
  PRBool IsASCII(const PRUnichar* aBuffer=0);

  void    DebugDump(void) const;

  /**
   *  Determine if given char is a valid space character
   *  
   *  @param   aChar is character to be tested
   *  @return  TRUE if is valid space char
   */
  static  PRBool IsSpace(PRUnichar ch);

  /**
   *  Determine if given char in valid alpha range
   *  
   *  @param   aChar is character to be tested
   *  @return  TRUE if in alpha range
   */
  static  PRBool IsAlpha(PRUnichar ch);

  /**
   *  Determine if given char is valid digit
   *  
   *  @param   aChar is character to be tested
   *  @return  TRUE if char is a valid digit
   */
  static  PRBool IsDigit(PRUnichar ch);

  static  void        Recycle(nsString* aString);
  static  nsString*  CreateString(void);

private:
    // NOT TO BE IMPLEMENTED
    //  these signatures help clients not accidentally call the wrong thing helped by C++ automatic integral promotion
  void operator=( char );
  void AssignWithConversion( PRUnichar );
  void AssignWithConversion( const PRUnichar*, PRInt32=-1 );
  void AppendWithConversion( PRUnichar );
  void AppendWithConversion( const PRUnichar*, PRInt32=-1 );
  void InsertWithConversion( const PRUnichar*, PRUint32, PRInt32=-1 );
};

// NS_DEF_STRING_COMPARISON_OPERATORS(nsString, PRUnichar)
NS_DEF_DERIVED_STRING_OPERATOR_PLUS(nsString, PRUnichar)

extern NS_COM int fputs(const nsString& aString, FILE* out);
//ostream& operator<<(ostream& aStream,const nsString& aString);
//virtual void  DebugDump(ostream& aStream) const;

/**************************************************************
  Here comes the AutoString class which uses internal memory
  (typically found on the stack) for its default buffer.
  If the buffer needs to grow, it gets reallocated on the heap.
 **************************************************************/

class NS_COM nsAutoString : public nsString {
public: 

    virtual ~nsAutoString();
    nsAutoString();
    nsAutoString(const nsAutoString& aString);
    explicit nsAutoString(const nsAReadableString& aString);
    explicit nsAutoString(const nsString& aString);
    explicit nsAutoString(const PRUnichar* aString);
    nsAutoString(const PRUnichar* aString,PRInt32 aLength);
    explicit nsAutoString(PRUnichar aChar);
    explicit nsAutoString(const CBufDescriptor& aBuffer);    

#if defined(AIX) || defined(XP_OS2_VACPP)
    explicit nsAutoString(const nsSubsumeStr& aSubsumeStr);  // AIX and VAC++ requires a const
#else
    explicit nsAutoString(nsSubsumeStr& aSubsumeStr);
#endif // AIX || XP_OS2_VACPP


    nsAutoString& operator=( const nsAutoString& aString )                          { Assign(aString); return *this; }
  private:
    void operator=( char ); // NOT TO BE IMPLEMENTED
  public:
    nsAutoString& operator=( const nsAReadableString& aReadable )                   { Assign(aReadable); return *this; }
    nsAutoString& operator=( const nsPromiseReadable<PRUnichar>& aReadable )        { Assign(aReadable); return *this; }
    nsAutoString& operator=( const PRUnichar* aPtr )                                { Assign(aPtr); return *this; }
    nsAutoString& operator=( PRUnichar aChar )                                      { Assign(aChar); return *this; }

    /**
     * Retrieve the size of this string
     * @return string length
     */
    virtual void SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const;
    
    char mBuffer[kDefaultStringSize<<eTwoByte];
};

NS_DEF_DERIVED_STRING_OPERATOR_PLUS(nsAutoString, PRUnichar)

class NS_COM NS_ConvertASCIItoUCS2
      : public nsAutoString
    /*
      ...
    */
  {
    public:
      explicit NS_ConvertASCIItoUCS2( const char* );
      NS_ConvertASCIItoUCS2( const char*, PRUint32 );
      explicit NS_ConvertASCIItoUCS2( char );

      const PRUnichar* get() const { return GetUnicode(); }

      operator const PRUnichar*() const
        {
          return GetUnicode();
        }

      operator nsLiteralString() const
        {
          return nsLiteralString(mUStr, mLength);
        }

    private:
        // NOT TO BE IMPLEMENTED
      NS_ConvertASCIItoUCS2( PRUnichar );
  };

#define NS_ConvertToString NS_ConvertASCIItoUCS2

#if 0
inline
nsAutoString
NS_ConvertToString( const char* aCString )
  {
    nsAutoString result;
    result.AssignWithConversion(aCString);
    return result;
  }

inline
nsAutoString
NS_ConvertToString( const char* aCString, PRUint32 aLength )
  {
    nsAutoString result;
    result.AssignWithConversion(aCString, aLength);
    return result;
  }
#endif


class NS_COM NS_ConvertUTF8toUCS2
      : public nsAutoString
  {
    public:
      explicit
      NS_ConvertUTF8toUCS2( const char* aCString )
        {
          Init( aCString, ~PRUint32(0) /* MAXINT */ );
        }

      NS_ConvertUTF8toUCS2( const char* aCString, PRUint32 aLength )
        {
          Init( aCString, aLength );
        }

      explicit
      NS_ConvertUTF8toUCS2( char aChar )
        {
          Init( &aChar, 1 );
        }

      operator const PRUnichar*() const
        {
          return GetUnicode();
        }

    protected:
      void Init( const char* aCString, PRUint32 aLength );

    private:
      NS_ConvertUTF8toUCS2( PRUnichar );
  };

/***************************************************************
  The subsumestr class is very unusual. 
  It differs from a normal string in that it doesn't use normal
  copy semantics when another string is assign to this. 
  Instead, it "steals" the contents of the source string.

  This is very handy for returning nsString classes as part of
  an operator+(...) for example, in that it cuts down the number
  of copy operations that must occur. 

  You should probably not use this class unless you really know
  what you're doing.
 ***************************************************************/
class NS_COM nsSubsumeStr : public nsString {
public:
  nsSubsumeStr();
  explicit nsSubsumeStr(nsStr& aString);
  nsSubsumeStr(PRUnichar* aString,PRBool assumeOwnership,PRInt32 aLength=-1);
  nsSubsumeStr(char* aString,PRBool assumeOwnership,PRInt32 aLength=-1);
  int Subsume(PRUnichar* aString,PRBool assumeOwnership,PRInt32 aLength=-1);

  nsSubsumeStr& operator=( const nsSubsumeStr& aReadable )                        { Assign(aReadable); return *this; }
  nsSubsumeStr& operator=( const nsAReadableString& aReadable )                   { Assign(aReadable); return *this; }
  nsSubsumeStr& operator=( const nsPromiseReadable<PRUnichar>& aReadable )        { Assign(aReadable); return *this; }
  nsSubsumeStr& operator=( const PRUnichar* aPtr )                                { Assign(aPtr); return *this; }
  nsSubsumeStr& operator=( PRUnichar aChar )                                      { Assign(aChar); return *this; }
private:
  void operator=( char ); // NOT TO BE IMPLEMENTED
};


#endif