/*************************************************************************
 *
 * 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
 */

#include <ops/express.h>
#include <mt/msmap.h>
#include <iostream>
#include <fstream>
using namespace std;

static fp_stream mout(stdout),merr(stderr);

struct tt_env : public op_env {
  sspile var;
  tt_env(opmap& map) : op_env(map) {}
  int split(sref& first,sref& rest) throw(merror_t) {
    static const charset spec("+-*%/<=>^_!~&|,?:;");
    static const charset delim("()\"\\");
    static const charset specws=spec|delim|cset_ws;
    int s;
    rest=rest.right_first_not_of(cset_ws);
    if((s=rest.skip(cset_quotes))>0) {
      first=rest.left(s);
      rest=rest.right(s);
    }
    else if((s=rest.skip(cset_para))>0) {
      first=Trim(rest.left(s),cset_para);
      rest=rest.right(s);
    }
    else if((s=rest.skip(cset_braces))>0) {
      first=rest.left(s);
      rest=rest.right(s);
    }
    else if(spec.test(*rest)) {
      first=rest.left_first_not_of(spec);
      rest=rest.adv(first);
    }
    else {
      first=rest.left_first_of(specws);
      rest=rest.adv(first);
    }
    return first.nempty();
  }
  void term(mstream& out,expr_t* x) throw(merror_t) {
    if(x->expr.empty()) {
      x->status=0;
    }
    else if(x->expr.skip(cset_quotes)==x->expr.size()) {
      out<<x->expr(1,-3);
      x->status=0;
    }
    else if(x->expr.find_not_of(cset_real)<0) {
      out<<x->expr;
      x->status=0;
    }
    else {
      for(sspile::iterator s=var.begin();s!=var.end();s++)
        if(s->first==x->expr) { out<<s->second; x->status=OP_LOCAL; break; }
    }
  }
};

#define TT_IMPL(n) \
static void impl_##n(mstream& out,tt_env& env,const sref& L,const sref& R)
#define TT_ADDN(p,f,n,d) \
M.add(new op_t(#n,0,p,1,2,0,(op_t::op2_t)impl_##f,d))

TT_IMPL(assign) {
  sspile& var=env.var;
  for(sspile::iterator p=var.begin();p!=var.end();p++)
    if(p->first==L) { p->second=R; return; }
  var.push_back(sstring(L,R));
}

TT_IMPL(incr) {
  sspile& var=env.var;
  for(sspile::iterator p=var.begin();p!=var.end();p++)
    if(p->first==L) { p->second=itoa(atoi(p->second)+atoi(R)); break; }
}

TT_IMPL(decr) {
  sspile& var=env.var;
  for(sspile::iterator p=var.begin();p!=var.end();p++)
    if(p->first==L) { p->second=itoa(atoi(p->second)-atoi(R)); break; }
}

inline void opAddTT(opmap& M) {
  TT_ADDN(4,assign,=,"C style"); 
  TT_ADDN(4,assign,:=,"new var"); 
  TT_ADDN(4,incr,+=,"C style"); 
  TT_ADDN(4,decr,-=,"C style"); 
}

main(int argc,char* argv[]) try
{
  opmap ops;
  opAddHEXP(ops);
  opAddTT(ops);
  tt_env env(ops);
  mstring buf;
  sref_t line;
  expr_t expr;
  if(argc>1) {
    buf.load(sref(argv[1]));
    sref first,rest=buf;
    Splitln(first,rest);
    if(first.left(2)!=sref("#!")) rest=buf;
    (expr=buf).expand(env);
    expr.eval(mout,env,OP_ALL);
    mout<<"\n";
  }
  else {
    while(1) {
      merr<<"ops>";
      cin.getline(line,sizeof(sref_t));
      sref first,rest(line);
      Split(first,rest);
      if(first==sref("exit")) {
        break;
      }
      else if(first==sref("tree")) {
        expr.trav(mout,12);
      }
      else if(first==sref("eval")) {
        expr.eval(mout,env,OP_ALL);
        mout<<"\n";
      }
      else {
        buf=line;
        try {
          (expr=buf).expand(env);
          expr.eval(mout,env,OP_ALL);
          mout<<"\n";
        }
        catch(const merror_t& e) {
          merr<<e.desc<<"\n";
        }
      }
    }
  }
  return 0;
}
catch(const merror_t& e) {
  merr<<"ops("<<e.num<<") "<<e.desc<<"\n";
  return -1;
}