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//
// Copyright (C)  2001-2013 Greg Landrum, Randal M. Henne and Rational Discovery
// LLC
//
//  @@ All Rights Reserved @@
//  This file is part of the RDKit.
//  The contents are covered by the terms of the BSD license
//  which is included in the file license.txt, found at the root
//  of the RDKit source tree.
//

#ifndef __RD_INVARIANT_H__
#define __RD_INVARIANT_H__

#include <assert.h>
#include <string>
#include <iostream>
#include <stdexcept>

#include <RDGeneral/RDLog.h>

#ifdef RDDEBUG
// Enable RDDEBUG for testing whether rdcast
//  conversions are within numerical limits
#include <boost/numeric/conversion/cast.hpp>
#endif
//
// What if no invariant method is defined?
//
#if !defined INVARIANT_EXCEPTION_METHOD && !defined INVARIANT_ASSERT_METHOD && \
    !defined INVARIANT_SILENT_METHOD
#define INVARIANT_EXCEPTION_METHOD 1
#endif

//
// What if an invariant method is defined, but none are true?
//
#if !INVARIANT_EXCEPTION_METHOD && !INVARIANT_ASSERT_METHOD && \
    !INVARIANT_SILENT_METHOD
#undef INVARIANT_EXCEPTION_METHOD
#define INVARIANT_EXCEPTION_METHOD 1
#endif

namespace Invar {

class Invariant : public std::runtime_error {
 public:
  Invariant(const char* prefix, const char* mess, const char* expr,
            const char* const file, int line)
      : std::runtime_error(prefix),
        mess_d(mess),
        expr_d(expr),
        prefix_d(prefix),
        file_dp(file),
        line_d(line) {}
  Invariant(const char* prefix, const std::string& mess, const char* expr,
            const char* const file, int line)
      : std::runtime_error(prefix),
        mess_d(mess.c_str()),
        expr_d(expr),
        prefix_d(prefix),
        file_dp(file),
        line_d(line) {}
  ~Invariant() throw(){};

  std::string getMessage() const { return mess_d; }

  const char* getFile() const { return file_dp; }

  std::string getExpression() const { return expr_d; }

  int getLine() const { return line_d; }

  std::string toString() const;
  std::string toUserString() const; // strips build info, adds version

 private:
  std::string mess_d, expr_d, prefix_d;

  const char* const file_dp;

  int line_d;
};
std::ostream& operator<<(std::ostream& s, const Invariant& inv);
}  // end of namespace Invar

#define ASSERT_INVARIANT(expr, mess) assert(expr)

//
// Set desired reporting method
//

#if INVARIANT_EXCEPTION_METHOD

#define CHECK_INVARIANT(expr, mess)                                    \
  if (!(expr)) {                                                       \
    Invar::Invariant inv("Invariant Violation", mess, #expr, __FILE__, \
                         __LINE__);                                    \
    BOOST_LOG(rdErrorLog) << "\n\n****\n" << inv << "****\n\n";        \
    throw inv;                                                         \
  }

#define PRECONDITION(expr, mess)                                           \
  if (!(expr)) {                                                           \
    Invar::Invariant inv("Pre-condition Violation", mess, #expr, __FILE__, \
                         __LINE__);                                        \
    BOOST_LOG(rdErrorLog) << "\n\n****\n" << inv << "****\n\n";            \
    throw inv;                                                             \
  }

#define POSTCONDITION(expr, mess)                                           \
  if (!(expr)) {                                                            \
    Invar::Invariant inv("Post-condition Violation", mess, #expr, __FILE__, \
                         __LINE__);                                         \
    BOOST_LOG(rdErrorLog) << "\n\n****\n" << inv << "****\n\n";             \
    throw inv;                                                              \
  }

#define UNDER_CONSTRUCTION(fn)                                        \
  Invar::Invariant inv("Incomplete Code",                             \
                       "This routine is still under development", fn, \
                       __FILE__, __LINE__);                           \
  BOOST_LOG(rdErrorLog) << "\n\n****\n" << inv << "****\n\n";         \
  throw inv;

#define RANGE_CHECK(lo, x, hi)                                              \
  if ((lo) > (hi) || (x) < (lo) || (x) > (hi)) {                            \
    std::stringstream errstr;                                               \
    errstr << lo << " <= " << x << " <= " << hi;                            \
    Invar::Invariant inv("Range Error", #x, errstr.str().c_str(), __FILE__, \
                         __LINE__);                                         \
    BOOST_LOG(rdErrorLog) << "\n\n****\n" << inv << "****\n\n";             \
    throw inv;                                                              \
  }

#define URANGE_CHECK(x, hi)                                                 \
  if ((x) > (hi)) {                                                         \
    std::stringstream errstr;                                               \
    errstr << x << " <= " << hi;                                            \
    Invar::Invariant inv("Range Error", #x, errstr.str().c_str(), __FILE__, \
                         __LINE__);                                         \
    BOOST_LOG(rdErrorLog) << "\n\n****\n" << inv << "****\n\n";             \
    throw inv;                                                              \
  }

#define TEST_ASSERT(expr)                                             \
  if (!(expr)) {                                                      \
    Invar::Invariant inv("Test Assert", "Expression Failed: ", #expr, \
                         __FILE__, __LINE__);                         \
    BOOST_LOG(rdErrorLog) << "\n\n****\n" << inv << "****\n\n";       \
    throw inv;                                                        \
  }

#elif INVARIANT_ASSERT_METHOD

#define CHECK_INVARIANT(expr, mess) assert(expr);
#define PRECONDITION(expr, mess) assert(expr);
#define POSTCONDITION(expr, mess) assert(expr);
#define UNDER_CONSTRUCTION(fn) assert(0);
#define RANGE_CHECK(lo, x, hi) \
  assert((lo) <= (hi) && (x) >= (lo) && (x) <= (hi));
#define URANGE_CHECK(lo, x, hi) assert((x) <= (hi));
#define TEST_ASSERT(expr) assert(expr);

#elif INVARIANT_SILENT_METHOD

#define CHECK_INVARIANT(expr, mess)
#define PRECONDITION(expr, mess)
#define POSTCONDITION(expr, mess)
#define UNDER_CONSTRUCTION(fn)
#define RANGE_CHECK(lo, x, hi)
#define URANGE_CHECK(x, hi)
#define TEST_ASSERT(expr)

#endif

#ifdef RDDEBUG
// use rdcast to convert between types
//  when RDDEBUG is defined, this checks for
//  validity (overflow, etc)
//  when RDDEBUG is off, the cast is a no-cost
//   static_cast
#define rdcast boost::numeric_cast
#else
#define rdcast static_cast
#endif

// Silence warnings for unused params while
//   still indicating that they are unused
#define RDUNUSED_PARAM(x) (void) x;

#endif