dal_naming_system.h

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/* -*- c++ -*- (enables emacs c++ mode) */
/*===========================================================================

 Copyright (C) 2002-2017 Yves Renard

 This file is a part of GetFEM++

 GetFEM++  is  free software;  you  can  redistribute  it  and/or modify it
 under  the  terms  of the  GNU  Lesser General Public License as published
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 (at your option) any later version along with the GCC Runtime Library
 Exception either version 3.1 or (at your option) any later version.
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 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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 License and GCC Runtime Library Exception for more details.
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 As a special exception, you  may use  this file  as it is a part of a free
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===========================================================================*/

#ifndef DAL_NAMING_SYSTEM_H
#define DAL_NAMING_SYSTEM_H

#include <deque>
#include <map>
#include "dal_static_stored_objects.h"
#include "getfem_omp.h"


namespace dal {

  /** @file dal_naming_system.h
      @author  Yves Renard <Yves.Renard@insa-lyon.fr>
      @date August 17, 2002.
      @brief Naming system.
  */


  /** Associate a name to a method descriptor and store method descriptors.
   *
   * Methods may have parameters such as integer or other methods.
   *  The class METHOD have to derive from dal::static_stored_object
   */
  template <class METHOD> class naming_system {

  public :

    typedef std::shared_ptr<const METHOD> pmethod;

    struct parameter {
      int type_; // 0 = numeric value, 1 = pointer on another method.
      double num_;
      pmethod pm_;

      pmethod method(void) const { return pm_; }
      double num(void) const { return num_; }
      int type(void) const { return type_; }
      parameter(double e) : type_(0), num_(e), pm_(0) {}
      parameter(pmethod p) : type_(1), num_(0.), pm_(p) {}
    };

    typedef std::deque<parameter> param_list;
    typedef pmethod (* pfunction)(param_list &,
                                  std::vector<pstatic_stored_object> &);
    typedef pmethod (* pgenfunction)(std::string,
                                     std::vector<pstatic_stored_object> &);
    typedef size_t size_type;

  protected :

    std::string prefix;
    std::map<std::string, size_type> suffixes;
    std::vector<pfunction> functions;
    std::vector<pgenfunction> genfunctions;
    std::map<std::string, std::string> shorter_names;
    std::map<std::string, std::string> aliases;

    struct method_key : virtual public static_stored_object_key {
      std::string name;

      virtual bool compare(const static_stored_object_key &oo) const {
        const method_key &o = dynamic_cast<const method_key &>(oo);
        if (name < o.name) return true; else return false;
      }
      method_key(const std::string &name_) : name(name_) {}
    };

    int mns_lexem(const std::string &s, size_type i, size_type &lenght);
    pmethod method_(const std::string &name, size_type &i, bool throw_if_not_found);




  public :

    void add_suffix(std::string name, pfunction pf);
    void add_generic_function(pgenfunction pf);
    std::string normative_name_of_method(pmethod pm) const;
    std::string shorter_name_of_method(pmethod pm) const;
    pmethod method(const std::string &name, size_type &i,
                   bool throw_if_not_found = true)
    { gmm::standard_locale sl; return method_(name, i, throw_if_not_found); }
    naming_system(std::string pr) : prefix(pr) {}
    bool delete_method(std::string name);
  };

  template <class METHOD>
  void naming_system<METHOD>::add_suffix(std::string name,
                       typename naming_system<METHOD>::pfunction pf) {
    std::string tname = prefix + '_' + name;
    if (suffixes.find(tname) != suffixes.end()) {
      functions[suffixes[tname]] = pf;
    } else {
      suffixes[tname] = functions.size();
      functions.push_back(pf);
    }

  }

  template <class METHOD>
  void naming_system<METHOD>::add_generic_function(pgenfunction pf) {
    genfunctions.push_back(pf);
  }

  template <class METHOD>
  std::string naming_system<METHOD>::normative_name_of_method(typename
                                 naming_system<METHOD>::pmethod pm)  const {
    pstatic_stored_object_key k = key_of_stored_object(pm);
    const method_key *p;
    if (!k || !(p = dynamic_cast<const method_key *>(k.get())))
      return prefix + "_UNKNOWN";
    return p->name;
  }

  template <class METHOD> std::string
  naming_system<METHOD>::shorter_name_of_method(typename
                                naming_system<METHOD>::pmethod pm)  const {
    pstatic_stored_object_key k = key_of_stored_object(pm);
    const method_key *p;
    if (!k || !(p = dynamic_cast<const method_key *>(k.get())))
      return prefix + "_UNKNOWN";
    const std::string &name(p->name);
    std::map<std::string, std::string>::const_iterator
      it = shorter_names.find(name);
    if (it != shorter_names.end()) return it->second;
    return name;
  }

  /* 0 = end of the string
     1 = espace
     2 = method name
     3 = number
     4 = '('
     5 = ')'
     6 = ','
  */
  template <class METHOD>
  int naming_system<METHOD>::mns_lexem(const std::string &s, size_type i,
                                       size_type &lenght) {
    lenght = 1;
    if (i >= s.size()) return 0;
    char c = s[i++];
    if (isspace(c)) return 1;
    if (isalpha(c) || c == '_') {
      while (i < s.size() && (isalpha(s[i]) || s[i] == '_' || isdigit(s[i])))
        { ++i;  ++lenght; }
      return 2;
    }
    if (isdigit(c) || c == '-' || c == '+') {
      while (i < s.size() && (isdigit(s[i]) || s[i] == 'e' || s[i] == 'E' ||
                              s[i] == '.' || s[i] == '-' || s[i] == '+'))
        { ++i;  ++lenght; }
      return 3;
    }
    if (c == '(') return 4;
    if (c == ')') return 5;
    if (c == ',') return 6;
    GMM_ASSERT1(false, "Invalid character on position " << i
                << " of the string : " << s);
  }


  template <class METHOD>
  typename naming_system<METHOD>::pmethod
  naming_system<METHOD>::method_(const std::string &name, size_type &i,
                                 bool throw_if_not_found) {
    int state = 0;
    bool error = false;
    bool isend = false;
    pmethod pm;
    size_type ind_suff = size_type(-1);
    size_type l;
    param_list params;
    std::string suff;

    for(;;) {
      int lex = mns_lexem(name, i, l);
      switch (state) {
      case 0 :
        switch (lex) {
        case 1  : i += l; break;
        case 2  :
          suff = name.substr(i, l);
          if (suffixes.find(suff) != suffixes.end())
            ind_suff = suffixes[suff];
          state = 1; i += l; break;
        default : error = true;
        }
        break;
      case 1 :
        switch (lex) {
        case 4  : state = 2; i += l; break;
        default : isend = true; break;
        }
        break;
      case 2 :
        switch (lex) {
        case 1  : i += l; break;
        case 2  :
          pm = method_(name, i, throw_if_not_found);
          if (!(pm.get())) return pm;
          params.push_back(parameter(pm));
          state = 3; break;
        case 3  : {
          char *p;
          gmm::standard_locale sl;
          params.push_back(parameter(strtod(&(name[i]), &p)));
          i += l; if (p < &(name[i])) error = true;
          state = 3; break;
        }
        case 5  : i += l; isend = true; break;
        default : error = true;
        }
        break;
      case 3 :
        switch (lex) {
        case 1  : i += l; break;
        case 5  : i += l; isend = true; break;
        case 6  : i += l; state = 2; break;
        default : error = true;
        }
        break;
      }
      GMM_ASSERT1(!error, "Syntax error on position " << i
                  << " of the string : " << name);
      if (isend) {
        std::stringstream norm_name(suff); //norm_name.imbue(std::locale("C"));
        gmm::standard_locale loc;
        norm_name << suff;
        if (params.size() > 0) {
          norm_name << '(';
          typename param_list::const_iterator it = params.begin(),
            ite = params.end();
          for (; it != ite; ++it) {
            if ((*it).type() == 0) norm_name << (*it).num();
            if ((*it).type() == 1)
              norm_name << normative_name_of_method((*it).method());
            if (it+1 != ite) norm_name << ',';
          }
          norm_name << ')';
        }
        auto pnname = std::make_shared<method_key>(norm_name.str());
        // method_key nname(norm_name.str());
        if (aliases.find(norm_name.str()) != aliases.end())
          pnname->name = aliases[norm_name.str()];
        pstatic_stored_object o = search_stored_object(pnname);
        if (o) return std::dynamic_pointer_cast<const METHOD>(o);
        pm = pmethod();
        std::vector<pstatic_stored_object> dependencies;
        for (size_type k = 0; k < genfunctions.size() && pm.get() == 0; ++k) {
          pm = (*(genfunctions[k]))(pnname->name, dependencies);
        }
        if (!(pm.get())) {
          if (ind_suff == size_type(-1)) {
            GMM_ASSERT1(!throw_if_not_found, "Unknown method: "<<pnname->name);
            return 0;
          }
          pm = (*(functions[ind_suff]))(params, dependencies);
        }
        pstatic_stored_object_key k = key_of_stored_object(pm);
        if (!k) {
          add_stored_object(pnname, pm,
                            dal::PERMANENT_STATIC_OBJECT);
          for (size_type j = 0; j < dependencies.size(); ++j)
            add_dependency(pm, dependencies[j]);
        }
        else {
          std::string normname((dynamic_cast<const method_key *>(k.get()))->name);
          aliases[pnname->name] = normname;
          if (pnname->name.size() < normname.size()) {
            if (shorter_names.find(normname) != shorter_names.end()) {
              if (pnname->name.size() < shorter_names[normname].size())
                shorter_names[normname] = pnname->name;
            }
            else shorter_names[normname] = pnname->name;
          }
        }
        return pm;
      }
    }

  }

  /**deletion of static_stored_object in the naming system*/
  template <class METHOD>
  bool naming_system<METHOD>::delete_method(std::string name) {
    pmethod pm;
    // method_key nname(name);
    pstatic_stored_object_key pnname = std::make_shared<method_key>(name);
    pstatic_stored_object o = search_stored_object(pnname);
    if (!o) return false;
    pm = std::dynamic_pointer_cast<const METHOD>(o);
    pstatic_stored_object_key k = key_of_stored_object(pm);
    dal::del_stored_object(pm, false);
    return true;
  }

}
#endif