InputConsumer.h

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/* Frobby: Software for monomial ideal computations.
   Copyright (C) 2011 Bjarke Hammersholt Roune (www.broune.com)
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see http://www.gnu.org/licenses/.
*/
#ifndef INPUT_CONSUMER_GUARD
#define INPUT_CONSUMER_GUARD
 
#include "BigIdeal.h"
#include "SquareFreeIdeal.h"
#include "VarNames.h"
#include "ElementDeleter.h"
#include <vector>
#include <list>
#include <string>
 
class Scanner;
 
class InputConsumer {
 public:
  InputConsumer();
 
  void consumeRing(const VarNames& names);
 
  void requireSquareFree();
 
  void beginIdeal();
 
  void hintGenCount(size_t hintGenCount);
 
  void beginTerm();
 
  size_t consumeVar(Scanner& in);
 
  size_t consumeVarNumber(Scanner& in);
 
  void consumeVarExponentOne(size_t var, const Scanner& in);
 
  void consumeVarExponent(size_t var, Scanner& in);
 
  void endTerm();
 
  void consumeTermProductNotation(Scanner& in);
 
  void endIdeal();
 
  bool empty() const {return _ideals.empty();}
 
  void releaseIdeal(auto_ptr<SquareFreeIdeal>& sqf, auto_ptr<BigIdeal>& big);
 
  auto_ptr<BigIdeal> releaseBigIdeal();
 
  auto_ptr<SquareFreeIdeal> releaseSquareFreeIdeal();
 
  const VarNames& getRing() const {return _names;}
 
 private:
  struct Entry {
    auto_ptr<BigIdeal> _big;
    auto_ptr<SquareFreeIdeal> _sqf;
  };
  void releaseIdeal(Entry& e);
 
  void errorVariableAppearsTwice(const Scanner& in, size_t var);
  void idealNotSquareFree();
  static void toBigIdeal
    (auto_ptr<SquareFreeIdeal>& sqf, auto_ptr<BigIdeal>& big);
 
  string _tmpString;
  VarNames _names;
  auto_ptr<BigIdeal> _bigIdeal;
  auto_ptr<SquareFreeIdeal> _sqfIdeal;
  vector<string> _term;
 
  std::list<Entry*> _ideals;
  ElementDeleter<std::list<Entry*> > _idealsDeleter;
  bool _inIdeal;
  bool _requireSquareFree;
};
 
#endif