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//
// HtSGMLCodec.h
//
// HtSGMLCodec: A Specialized HtWordCodec class to convert between SGML
// ISO 8859-1 entities and high-bit characters.
//
// Part of the ht://Dig package <http://www.htdig.org/>
// Copyright (c) 1995-2004 The ht://Dig Group
// For copyright details, see the file COPYING in your distribution
// or the GNU Library General Public License (LGPL) version 2 or later
// <http://www.gnu.org/copyleft/lgpl.html>
//
// $Id: HtSGMLCodec.h,v 1.4 2004/05/28 13:15:12 lha Exp $
//
#ifndef __HtSGMLCodec_h
#define __HtSGMLCodec_h
#include "HtWordCodec.h"
// Container for a HtWordCodec (not subclassed from it due to
// portability-problems using initializers).
// Not for subclassing.
class HtSGMLCodec
{
public:
static HtSGMLCodec *instance();
virtual ~HtSGMLCodec();
// Similar to the HtWordCodec class. Each string may contain
// zero or more of words from the lists. Here we need to run
// it through two codecs because we might have two different forms
inline String encode(const String &uncoded) const
{ return myTextWordCodec->encode(myNumWordCodec->encode(uncoded)); }
// But we only want to decode into one form i.e. &foo; NOT &#nnn;
String decode(const String &coded) const
{ return myTextWordCodec->decode(coded); }
// If an error was discovered during the parsing of
// entities, this returns an error message
String& ErrMsg();
// egcs-1.1 (and some earlier versions) always erroneously
// warns (even without warning flags) about classic singleton
// constructs ("only defines private constructors and has no
// friends"). Rather than adding autoconf tests to shut these
// versions up with -Wno-ctor-dtor-privacy, we fake normal
// conformism for it here (the minimal effort).
friend void my_friend_Harvey__a_faked_friend_function();
private:
// Hide default-constructor, copy-constructor and assignment
// operator, making this a singleton.
HtSGMLCodec();
HtSGMLCodec(const HtSGMLCodec &);
void operator= (const HtSGMLCodec &);
HtWordCodec *myTextWordCodec; // For &foo;
HtWordCodec *myNumWordCodec; // For &#foo;
String myErrMsg;
};
#endif /* __HtSGMLCodec_h */
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