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Patches.h

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00001 #ifndef TAGCOLL_PATCHES_H
00002 #define TAGCOLL_PATCHES_H
00003 
00004 /*
00005  * Classes handling tag patches
00006  *
00007  * Copyright (C) 2003  Enrico Zini <enrico@debian.org>
00008  *
00009  * This library is free software; you can redistribute it and/or
00010  * modify it under the terms of the GNU Lesser General Public
00011  * License as published by the Free Software Foundation; either
00012  * version 2.1 of the License, or (at your option) any later version.
00013  *
00014  * This library is distributed in the hope that it will be useful,
00015  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017  * Lesser General Public License for more details.
00018  *
00019  * You should have received a copy of the GNU Lesser General Public
00020  * License along with this library; if not, write to the Free Software
00021  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
00022  */
00023 
00024 #pragma interface
00025 
00026 #include <tagcoll/TagcollConsumer.h>
00027 #include <tagcoll/TagcollFilter.h>
00028 #include <tagcoll/InputMerger.h>
00029 
00030 #include <map>
00031 #include <string>
00032 
00033 namespace Tagcoll
00034 {
00035 
00036 // List of explicit implications that can be used to expand a tagged collection
00037 // while it's being parsed
00038 template <class ITEM>
00039 class PatchList : public TagcollConsumer<ITEM, std::string>
00040 {
00041 protected:
00042     typedef std::map< ITEM, OpSet<std::string> > patch_t;
00043     patch_t patches;
00044 
00045     void addAllEquals(const ITEM& item, char prefix, const OpSet<std::string>& tags) throw ();
00046 
00047 public:
00048     virtual ~PatchList() throw () {}
00049 
00050     void generate(const InputMerger<ITEM, std::string>& im1, const InputMerger<ITEM, std::string>& im2) throw ();
00051 
00052     virtual void consume(const ITEM& item) throw () {}
00053     virtual void consume(const ITEM& item, const OpSet<std::string>& tags) throw ();
00054     
00055     // Patch a tagged item: return the new set of tags
00056     OpSet<std::string> patch(const ITEM& item, const OpSet<std::string>& tagset) const throw ();
00057 
00058     // Output the patch list to a TagcollConsumer
00059     void output(TagcollConsumer<ITEM, std::string>& consumer) const throw ();
00060 };
00061 
00062 template <class ITEM>
00063 class ApplyPatches : public TagcollFilter<ITEM, std::string>
00064 {
00065 protected:
00066     PatchList<ITEM>& patches;
00067     
00068 public:
00069     ApplyPatches(PatchList<ITEM>& patches) throw ()
00070         : patches(patches) {}
00071 
00072     virtual void consume(const ITEM& item) throw ();
00073     virtual void consume(const ITEM& item, const OpSet<std::string>& tags) throw ();
00074 };
00075 
00076 };
00077 
00078 // vim:set ts=4 sw=4:
00079 #endif

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