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71 lines
2.5 KiB
71 lines
2.5 KiB
3 years ago
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//
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// HtWordCodec.h
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//
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// HtWordCodec: Given two lists of pair of "words" 'from' and 'to';
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// simple one-to-one translations, use those lists to translate.
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// Only restriction are that no null (0) characters must be
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// used in "words", and that there is a character "joiner" that
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// does not appear in any word. One-to-one consistency may be
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// checked at construction.
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//
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// Part of the ht://Dig package <http://www.htdig.org/>
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// Copyright (c) 1999-2004 The ht://Dig Group
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// For copyright details, see the file COPYING in your distribution
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// or the GNU Library General Public License (LGPL) version 2 or later
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// <http://www.gnu.org/copyleft/lgpl.html>
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//
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// $Id: HtWordCodec.h,v 1.6 2004/05/28 13:15:21 lha Exp $
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//
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#ifndef __HtWordCodec_h
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#define __HtWordCodec_h
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#include "HtCodec.h"
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#include "StringList.h"
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#include "StringMatch.h"
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class HtWordCodec : public HtCodec
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{
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public:
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HtWordCodec();
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virtual ~HtWordCodec();
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// Set the lists of asymmetric pairs of "words" in "from" and
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// "to", using:
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// * one list of requested encodings with two consecutive
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// items "to" and "from" per translation
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// * one list of just words which HtWordCodec will generate
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// space-saving encodings for.
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// Either may be empty.
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// Items in frequent_substrings will be silently ignored if
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// they collide with anything in requested_encoding_pairs.
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// CodingError is empty on success, or has a failure message.
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HtWordCodec(StringList &requested_encodings,
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StringList &frequest_substrings, String &errmsg);
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// *Or*, set the lists directly, without checking coding
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// consistency. HtWordCodec will delete these lists when
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// destroyed. Not really recommended, but this class would be
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// incomplete without it.
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HtWordCodec (StringList *from, StringList *to, char joiner = char(1));
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// Same as those in the parent class. Each string to
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// encode/decode may contain zero or more of words from the
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// lists. Those words will be replaced.
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virtual String encode(const String &uncoded) const;
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virtual String decode(const String &coded) const;
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private:
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HtWordCodec(const HtWordCodec &); // Not supposed to be implemented.
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void operator= (const HtWordCodec &); // Not supposed to be implemented.
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StringList *myFrom;
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StringList *myTo;
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StringMatch *myFromMatch;
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StringMatch *myToMatch;
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// Do coding/decoding symmetrically using the provided lookup and lists.
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String code(const String &, StringMatch& match, StringList& replacements) const;
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};
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#endif /* __HtWordCodec_h */
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