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//
// HtWordCodec.h
//
// HtWordCodec: Given two lists of pair of "words" 'from' and 'to';
// simple one-to-one translations, use those lists to translate.
// Only restriction are that no null (0) characters must be
// used in "words", and that there is a character "joiner" that
// does not appear in any word. One-to-one consistency may be
// checked at construction.
//
// Part of the ht://Dig package <http://www.htdig.org/>
// Copyright (c) 1999-2004 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: HtWordCodec.h,v 1.6 2004/05/28 13:15:21 lha Exp $
//
#ifndef __HtWordCodec_h
#define __HtWordCodec_h
#include "HtCodec.h"
#include "StringList.h"
#include "StringMatch.h"
class HtWordCodec : public HtCodec
{
public:
HtWordCodec();
virtual ~HtWordCodec();
// Set the lists of asymmetric pairs of "words" in "from" and
// "to", using:
// * one list of requested encodings with two consecutive
// items "to" and "from" per translation
// * one list of just words which HtWordCodec will generate
// space-saving encodings for.
// Either may be empty.
// Items in frequent_substrings will be silently ignored if
// they collide with anything in requested_encoding_pairs.
// CodingError is empty on success, or has a failure message.
HtWordCodec(StringList &requested_encodings,
StringList &frequest_substrings, String &errmsg);
// *Or*, set the lists directly, without checking coding
// consistency. HtWordCodec will delete these lists when
// destroyed. Not really recommended, but this class would be
// incomplete without it.
HtWordCodec (StringList *from, StringList *to, char joiner = char(1));
// Same as those in the parent class. Each string to
// encode/decode may contain zero or more of words from the
// lists. Those words will be replaced.
virtual String encode(const String &uncoded) const;
virtual String decode(const String &coded) const;
private:
HtWordCodec(const HtWordCodec &); // Not supposed to be implemented.
void operator= (const HtWordCodec &); // Not supposed to be implemented.
StringList *myFrom;
StringList *myTo;
StringMatch *myFromMatch;
StringMatch *myToMatch;
// Do coding/decoding symmetrically using the provided lookup and lists.
String code(const String &, StringMatch& match, StringList& replacements) const;
};
#endif /* __HtWordCodec_h */
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