/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Guido Tack <tack@gecode.org>
 *
 *  Copyright:
 *     Guido Tack, 2007
 *
 *  Last modified:
 *     $Date: 2011-01-18 20:06:16 +1100 (Tue, 18 Jan 2011) $ by $Author: tack $
 *     $Revision: 11538 $
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
 *
 *  Permission is hereby granted, free of charge, to any person obtaining
 *  a copy of this software and associated documentation files (the
 *  "Software"), to deal in the Software without restriction, including
 *  without limitation the rights to use, copy, modify, merge, publish,
 *  distribute, sublicense, and/or sell copies of the Software, and to
 *  permit persons to whom the Software is furnished to do so, subject to
 *  the following conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#ifndef __FLATZINC_PARSER_HH__
#define __FLATZINC_PARSER_HH__

#include <cstring>
#include "flatzinc.hh"

// This is a workaround for a bug in flex that only shows up
// with the Microsoft C++ compiler
#if defined(_MSC_VER)
#define YY_NO_UNISTD_H
#ifdef __cplusplus
extern "C" int isatty(int);
#endif
#endif

// The Microsoft C++ compiler marks certain functions as deprecated,
// so let's take the alternative definitions
#if defined(_MSC_VER)
#define strdup _strdup
#define fileno _fileno
#endif

#include <string>
#include <vector>
#include <iostream>
#include <algorithm>

#include "option.hh"
#include "varspec.hh"
#include "conexpr.hh"
#include "ast.hh"
#include "parser.tab.hh"
#include "symboltable.hh"

namespace FlatZinc {

  typedef std::pair<std::string,Option<std::vector<int>* > > intvartype;

  class VarSpec;
  typedef std::pair<std::string, VarSpec*> varspec;

  /// Strict weak ordering for output items
  class OutputOrder {
  public:
    /// Return if \a x is less than \a y, based on first component
    bool operator ()(const std::pair<std::string,AST::Node*>& x,
                     const std::pair<std::string,AST::Node*>& y) {
      return x.first < y.first;
    }
  };

  /// %State of the %FlatZinc parser
  class ParserState {
  public:
    ParserState(const std::string& b, std::ostream& err0,
                FlatZinc::FlatZincModel* fg0)
    : buf(b.c_str()), pos(0), length(b.size()), fg(fg0),
      hadError(false), err(err0) {}

    ParserState(char* buf0, int length0, std::ostream& err0,
                FlatZinc::FlatZincModel* fg0)
    : buf(buf0), pos(0), length(length0), fg(fg0),
      hadError(false), err(err0) {}
  
    void* yyscanner;
    const char* buf;
    unsigned int pos, length;
    FlatZinc::FlatZincModel* fg;
    std::vector<std::pair<std::string,AST::Node*> > _output;

    SymbolTable<int> intvarTable;
    SymbolTable<int> boolvarTable;
    SymbolTable<int> floatvarTable;
    SymbolTable<int> setvarTable;
    SymbolTable<std::vector<int> > intvararrays;
    SymbolTable<std::vector<int> > boolvararrays;
    SymbolTable<std::vector<int> > floatvararrays;
    SymbolTable<std::vector<int> > setvararrays;
    SymbolTable<std::vector<int> > intvalarrays;
    SymbolTable<std::vector<int> > boolvalarrays;
    SymbolTable<int> intvals;
    SymbolTable<bool> boolvals;
    SymbolTable<AST::SetLit> setvals;
    SymbolTable<std::vector<AST::SetLit> > setvalarrays;

    std::vector<varspec> intvars;
    std::vector<varspec> boolvars;
    std::vector<varspec> setvars;

    std::vector<ConExpr*> domainConstraints;

    bool hadError;
    std::ostream& err;
  
    int fillBuffer(char* lexBuf, unsigned int lexBufSize) {
      if (pos >= length)
        return 0;
      int num = std::min(length - pos, lexBufSize);
      memcpy(lexBuf,buf+pos,num);
      pos += num;
      return num;    
    }

    void output(std::string x, AST::Node* n) {
      _output.push_back(std::pair<std::string,AST::Node*>(x,n));
    }
    
    AST::Array* getOutput(void) {
      OutputOrder oo;
      std::sort(_output.begin(),_output.end(),oo);
      AST::Array* a = new AST::Array();
      for (unsigned int i=0; i<_output.size(); i++) {
        a->a.push_back(new AST::String(_output[i].first+" = "));
        if (_output[i].second->isArray()) {
          AST::Array* oa = _output[i].second->getArray();
          for (unsigned int j=0; j<oa->a.size(); j++) {
            a->a.push_back(oa->a[j]);
            oa->a[j] = NULL;
          }
          delete _output[i].second;
        } else {
          a->a.push_back(_output[i].second);
        }
        a->a.push_back(new AST::String(";\n"));
      }
      return a;
    }
  
  };

}

#endif

// STATISTICS: flatzinc-any