/*********************                                                        */
/*! \file rational_cln_imp.cpp
 ** \verbatim
 ** Original author: taking
 ** Major contributors: mdeters
 ** Minor contributors (to current version): none
 ** This file is part of the CVC4 prototype.
 ** Copyright (c) 2009, 2010  The Analysis of Computer Systems Group (ACSys)
 ** Courant Institute of Mathematical Sciences
 ** New York University
 ** See the file COPYING in the top-level source directory for licensing
 ** information.\endverbatim
 **
 ** \brief A multi-precision rational constant.
 **
 ** A multi-precision rational constant.
 **/

#include "cvc4autoconfig.h"
#include "util/rational.h"
#include <string>

#ifndef CVC4_CLN_IMP
#  error "This source should only ever be built if CVC4_CLN_IMP is on !"
#endif /* CVC4_CLN_IMP */

using namespace std;
using namespace CVC4;

/* Computes a rational given a decimal string. The rational
 * version of <code>xxx.yyy</code> is <code>xxxyyy/(10^3)</code>.
 */
Rational Rational::fromDecimal(const std::string& dec) {
  // Find the decimal point, if there is one
  string::size_type i( dec.find(".") );
  if( i != string::npos ) {
    /* Erase the decimal point, so we have just the numerator. */
    Integer numerator( string(dec).erase(i,1) );

    /* Compute the denominator: 10 raise to the number of decimal places */
    int decPlaces = dec.size() - (i + 1);
    Integer denominator( Integer(10).pow(decPlaces) );

    return Rational( numerator, denominator );
  } else {
    /* No decimal point, assume it's just an integer. */
    return Rational( dec );
  }
}

std::ostream& CVC4::operator<<(std::ostream& os, const Rational& q){
  return os << q.toString();
}