fex_rule.h

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//
//    FreeLing - Open Source Language Analyzers
//
//    Copyright (C) 2004   TALP Research Center
//                         Universitat Politecnica de Catalunya
//
//    This library 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 3 of the License, or (at your option) any later version.
//
//    This library 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 library; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
//    contact: Lluis Padro (padro@lsi.upc.es)
//             TALP Research Center
//             despatx C6.212 - Campus Nord UPC
//             08034 Barcelona.  SPAIN
//

#ifndef _FEX_RULE
#define _FEX_RULE

#include <map>
#include <set>
#include <boost/regex/icu.hpp>
#include "freeling/morfo/language.h"

#define OP_NONE 0
#define OP_AND 1
#define OP_OR 2


class fex_condition {
 private:
  std::wstring function;
  std::wstring focus;
  std::wstring split;
  std::wstring literal;
  std::set<std::wstring> *fileset;
  boost::u32regex match_re;
  boost::wsmatch re_result;
  bool negated;
  bool cond_true;

  static boost::u32regex split_re;

  static std::map<std::wstring, std::set<std::wstring> > set_files;
    
  std::list<std::wstring> get_target(const word &) const;    

 public:
  // constructor
  fex_condition();
  fex_condition(const std::wstring&,const std::wstring&,const std::wstring&);
  fex_condition(const fex_condition &);
  fex_condition& operator=(const fex_condition&);

  bool check(const word&) ;
  bool is_true() const;
  std::wstring get_match(int) const;
  void trace(int) const;
};


class feature_function {  
 public: 
  virtual void extract (const sentence &, int, std::list<std::wstring> &) const =0;
  virtual ~feature_function() {};
};



class fex_rule {  
 private:
  std::wstring pattern;
  int left,right;
  std::list<fex_condition> conds;
  int operation;
  std::map<int,std::list<std::wstring> > features;

  static boost::u32regex rulepat;
  static boost::u32regex rulepat_anch;
  static boost::u32regex subexpr;
  static boost::u32regex featfun;

  void pattern_instance(const sentence &, int, std::list<std::wstring> &) const;
  void get_replacements(const std::wstring &, const word &, std::list<std::wstring> &) const;

 public:
  fex_rule (const std::wstring &, const std::wstring &, int, 
            const std::list<fex_condition> &);
  fex_rule(const fex_rule &);
  fex_rule& operator=(const fex_rule&);

  void clear_features();
  void precompute(const sentence&, int) ;
  void extract(const sentence&, int, int, std::list<std::wstring> &) const;
  int get_left() const;
  int get_right() const;

  static bool check_conds(std::list<fex_condition> &, int, const word &);

  void trace(int) const;

  static std::map<std::wstring,const feature_function *> feat_functs;

  static std::map<std::wstring,const feature_function *> nerc_features;
};



class fex_rulepack  {
 public:
  std::list<fex_condition> conds;
  int operation;
  std::list<fex_rule> rules;

  fex_rulepack();
  fex_rulepack(const fex_rulepack &);
  fex_rulepack& operator=(const fex_rulepack&);

  void trace(int) const;
};


#endif