source: src/dgp/boubble.hh

#ifndef _BOUBBLE_HH_
#define _BOUBBLE_HH_

#include <list>
#include <iostream>
#include <sstream>

#include "thesymbols.hh"


enum Dir {UP=0,DOWN=1,AT_TARGET=2};

// class BoubbleAction
// {
// public:
//   void apply() {};
// private:
  
// };



class Boubble
{
public:
  Boubble() {};
  Boubble(list<Role> u, list<Role> d, LongRel l, int s=-1, bool r=false);
  Boubble(const char* pathstr, const char* l, int s=-1, bool r=false);
  //Boubble(const Boubble& b) {_src=b._src; _upath=b._upath; _dpath=b._dpath; _rel=b._rel; _reverse=b._reverse; };

  Dir dir() const;
  LongRel rel() const;
  int src() const;
  void src(int s);
  bool reverse() const;
  void reverse(bool b);

  Role next();

  Boubble* step(Role r, Dir d);
  Boubble* reversed();
  
  bool is_at_target() const;

  bool operator==(Boubble const& b) const;
  bool operator!=(Boubble const& b) const;
  bool operator<(Boubble const& b) const;

  void as_cstr(char* s);
  friend std::ostream& operator<<(std::ostream&, const Boubble&);

private:

  int                  _src;
  list<Role>           _upath;
  list<Role>           _dpath;
  LongRel              _rel;
  bool                 _reverse;

};

//----------------------------------------------------------------------------------------------------

inline
Boubble::Boubble(list<Role> u, list<Role> d, LongRel l, int s, bool r)
  : _upath(u), _dpath(d), _rel(l), _src(s), _reverse(r) {}

//----------------------------------------------------------------------------------------------------

inline
Boubble::Boubble(const char* pathstr, const char* l, int s, bool r)
{
  Dir dir = UP;
  const char* p = pathstr;
  while(*p)
    {
      if(*p=='^') { dir = DOWN; p++; }
      else if(isalpha(*p))
        {
          char buf[80];
          sscanf(p,"%[a-zA-Z0-9_]",buf);
          dir == UP ? _upath.push_back(Role(buf)) : _dpath.push_back(Role(buf));
          p += strlen(buf);
        }
      else
        p++;
    }
  
  _rel = LongRel(l);
  _src = s;
  _reverse = r;
}

//----------------------------------------------------------------------------------------------------

inline
Dir Boubble::dir() const
{ 
  if(!_upath.empty())
    return UP;
  else if(!_dpath.empty())
    return DOWN;
  else return AT_TARGET;
}

//----------------------------------------------------------------------------------------------------

inline
LongRel Boubble::rel() const
{ return _rel; }

//----------------------------------------------------------------------------------------------------

inline
int Boubble::src() const
{ return _src; }

//----------------------------------------------------------------------------------------------------

inline
void Boubble::src(int s)
{ _src=s; }

//----------------------------------------------------------------------------------------------------

inline
bool Boubble::reverse() const
{ return _reverse; }

//----------------------------------------------------------------------------------------------------

inline
void Boubble::reverse(bool b)
{ _reverse=b; }

//----------------------------------------------------------------------------------------------------

inline
Role Boubble::next()
{ 
  if(!_upath.empty())
    return _upath.front();
  else if(!_dpath.empty())
    return _dpath.front();
  else return Role("NULL"); 
}

//----------------------------------------------------------------------------------------------------

inline
Boubble* Boubble::step(Role r, Dir d)
{
  if(d==UP && !_upath.empty() && _upath.front() == r)
    {
      Boubble* newboubble = new Boubble(_upath,_dpath,_rel,_src,_reverse);
      newboubble->_upath.pop_front();
      return newboubble;
    }
  
  if(d==DOWN && _upath.empty() && !_dpath.empty() && _dpath.front() == r)
    {
      Boubble* newboubble = new Boubble(_upath,_dpath,_rel,_src,_reverse);
      newboubble->_dpath.pop_front();
      return newboubble;
    }
  return NULL;
}

//----------------------------------------------------------------------------------------------------

inline
Boubble* Boubble::reversed()
{
  Boubble* newboubble = new Boubble(_dpath,_upath,_rel,-1,!_reverse);
  newboubble->_upath.reverse();
  newboubble->_dpath.reverse();
  // cout << *this << "-----" << *newboubble << endl;
  return newboubble;
}

//----------------------------------------------------------------------------------------------------

inline
bool Boubble::is_at_target() const
{ return _upath.empty() && _dpath.empty(); }

//----------------------------------------------------------------------------------------------------

inline
bool Boubble::operator==(Boubble const& b) const
{
  return _src==b._src && _upath==b._upath && _dpath==b._dpath && _rel==b._rel;
}

//----------------------------------------------------------------------------------------------------

inline
bool Boubble::operator!=(Boubble const& b) const
{
  return !(*this==b);
}

//----------------------------------------------------------------------------------------------------

inline
bool Boubble::operator<(Boubble const& b) const
{
  if(_src < b._src) return true;
  if(_rel < b._rel) return true;
  if(this < &b) return true;
  return false;
}

//----------------------------------------------------------------------------------------------------

inline
std::ostream& operator<<(std::ostream& o, const Boubble& b)
{
  o << "[";

  o << b._src << "|";

  bool cont=false;
  for(list<Role>::const_iterator i = b._upath.begin(); i != b._upath.end(); ++i)
    {
      if(cont) o << ',';
      o << i->str();
      cont = true;
    }
  o << '^';
  cont=false;
  for(list<Role>::const_iterator i = b._dpath.begin(); i != b._dpath.end(); ++i)
    {
      if(cont) o << ',';
      o << i->str();
      cont = true;
    }
  o << ':';
  o << b._rel.str();
  o << "]";
  if(b.reverse()) o << "!";
  return o;
}

//----------------------------------------------------------------------------------------------------

inline
void Boubble::as_cstr(char* s)
{
  stringstream oss;
  oss << *this;
  strcpy(s,oss.str().c_str());
}

//====================================================================================================

#endif