/*************************************************************************
 *
 * HTCd - Copyright (C) 1998-2006 Henrik Rydberg
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef ENVH
#define ENVH

#include <lang/token.h>

mstring Random(int n);

const int OP_PARSE=8;
const mstring para_def="\n";

////////////////////////////////////////////////////////////////////

struct Lang {
  volatile int running;
  opmap ops;
  tokmap toks;
  Lang();
  virtual ~Lang() {}
};

struct req_env {
  Lang* glob;
  tokmap toks;
  mstring uri;
  int lang;
  volatile int* running;

  int is_running() const { return glob->running&&(!running||*running); }

  req_env(Lang& g,tokmap& p) : glob(&g),toks(p),uri(),lang(0),running(0) {}
  virtual ~req_env() {}
};

////////////////////////////////////////////////////////////////////

struct Env : public op_env {
  typedef mrvec<expr_t*> xpile;
  typedef tokmap::iterator iterator;
  typedef tokmap::const_iterator const_iterator;
  
  Env(opmap& op,req_env& r,unsigned m):
    op_env(op),req(&r),toks(&r.toks),up(0),mod(m),
    loc(),db(0),dbat(0),pwd(r.uri),para(para_def),args(0) {}

  Env(Env& p,tokmap& tok,const sref& cwd):
    op_env(p),req(p.req),toks(&tok),up(p.up),mod(p.mod),
    loc(p.loc),db(0),dbat(0),pwd(cwd),para(p.para),args(0) {}
  Env(Env& p,unsigned m,const sref& cwd):
    op_env(p),req(p.req),toks(p.toks),up(p.up),mod(m),
    loc(p.loc),db(0),dbat(0),pwd(cwd),para(p.para),args(0) {}

  Env(Env& p):
    op_env(p),req(p.req),toks(p.toks),up(p.up),mod(p.mod),
    loc(p.loc),db(p.db),dbat(p.dbat),pwd(p.pwd),para(p.para),args(0) {}
  Env(Env& p,dbmap& dbm):
    op_env(p),req(p.req),toks(p.toks),up(p.up),mod(p.mod),
    loc(p.loc),db(&dbm),dbat(0),pwd(p.pwd),para(p.para),args(0) {}
  Env(Env& p,opmap& op):
    op_env(op),req(p.req),toks(p.toks),up(p.up),mod(p.mod),
    loc(p.loc),db(p.db),dbat(p.dbat),pwd(p.pwd),para(p.para),args(0) {}

  ~Env() { clear_args(); }

  int is_clear(const tok_t* tok) const { return tok&&tok->is_clear(mod); }
  unsigned tight() const { return tok_t::tight(mod); }

  int check_arg(const runnable_t& ftok) const;
  int is_arg(const sref& t) const { return cset_digit.test(t.front()); }
  
  int xsize() const { return xarg.size(); }
  int rsize() const { return rarg.size(); }
  
  void xpush(const sref& in) throw(merror_t);
  void rpush(const sref& in) throw(merror_t);
  void clear_args();  
  
  void parg(mstream& out,int n) throw(merror_t);
  void parg(mstring& buf,int n) throw(merror_t);
  mstring parg(int n) throw(merror_t);
  
  const sref& operator[](int m) const throw(merror_t);
  expr_t* arg(int m) throw(merror_t);
  
  const sref glob(const sref& t) const throw(merror_t);
  
  int glob_find(const sref& t) const;
  void glob_list(rpile& list,const sref& t) const;
  void glob_adb(const sref& fx,const sref& t) throw(merror_t);  
  
  const sref aloc(const sref& t,const sref& v) throw(merror_t);
  const sref sloc(const sref& t,const sref& v) throw(merror_t);
  const sref gloc(const sref& t) const throw(merror_t);

  int gloc_find(const sref& t) const;
  void gloc_list(rpile& list,const sref& t) const;
  void gloc_adb(const sref& fx,const sref& t) throw(merror_t);  

  int onarg(int m) const;
  int onglob(const sref& s) const;
  int onloc(const sref& s) const;

  void parse(mstream& out,const sref& in) throw(merror_t);
  void expr(mstream& out,const sref& in) throw(merror_t);
  void parse(mstream& out,expr_t* x) throw(merror_t);

  void eval(mstream& out,const sref& in,int child) throw(merror_t);
  void eval(mstream& out,expr_t* x,int child) throw(merror_t);
  void eval(mstream& out,runnable_t* ftok,int child) throw(merror_t);
  
  int split(sref& first,sref& rest) throw(merror_t);
  void term(mstream& out,expr_t* x) throw(merror_t);

  mstring URI(const sref& raw);

  Env *up;
  req_env* req;
  tokmap* toks;
  int mod,dbat;
  tokmap loc;
  dbmap* db;
  mstring pwd,para,epilog;
  int args;
  xpile xarg,rarg;
};

/////////////////////////////////////////////////////////////////////

struct latex_env : public Env {
  latex_env(Env& p);

  int split(sref& first,sref& rest) throw(merror_t);
  void term(mstream& out,expr_t* x) throw(merror_t);
};

/////////////////////////////////////////////////////////////////////

#endif