/* -*- Mode: C; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/* vim: set filetype=c tabstop=2 shiftwidth=2 expandtab: */

/*
 * plus.d - implementation of CL:+
 *
 * Copyright (c) 1984 Taiichi Yuasa and Masami Hagiya
 * Copyright (c) 1990 Giuseppe Attardi
 * Copyright (c) 2001 Juan Jose Garcia Ripoll
 *
 * See file 'LICENSE' for the copyright details.
 *
 */


#include <ecl/ecl.h>
#include <ecl/impl/math_dispatch2.h>

@(defun + (&rest nums)
  cl_object sum = ecl_make_fixnum(0);
  @
  /* INV: type check is in ecl_plus() */
  while (narg--)
  sum = ecl_plus(sum, ecl_va_arg(nums));
  @(return sum)
  @)

#ifdef MATH_DISPATCH2_BEGIN

cl_object
ecl_plus(cl_object x, cl_object y)
{
  MATH_DISPATCH2_BEGIN(x,y)
    {
      CASE_FIXNUM_FIXNUM {
        return ecl_make_integer(ecl_fixnum(x) + ecl_fixnum(y));
      }
      CASE_FIXNUM_BIGNUM {
        return _ecl_big_plus_fix(y, ecl_fixnum(x));
      }
      CASE_FIXNUM_RATIO;
      CASE_BIGNUM_RATIO {
        cl_object z = ecl_times(x, y->ratio.den);
        z = ecl_plus(z, y->ratio.num);
        return ecl_make_ratio(z, y->ratio.den);
      }
      CASE_FIXNUM_SINGLE_FLOAT {
        return ecl_make_single_float(ecl_fixnum(x) + ecl_single_float(y));
      }
      CASE_FIXNUM_DOUBLE_FLOAT {
        return ecl_make_double_float(ecl_fixnum(x) + ecl_double_float(y));
      }
      CASE_BIGNUM_FIXNUM {
        return _ecl_big_plus_fix(x, ecl_fixnum(y));
      }
      CASE_BIGNUM_BIGNUM {
        return _ecl_big_plus_big(x, y);
      }
      CASE_BIGNUM_SINGLE_FLOAT;
      CASE_RATIO_SINGLE_FLOAT {
        return ecl_make_single_float(ecl_to_float(x) + ecl_single_float(y));
      }
      CASE_BIGNUM_DOUBLE_FLOAT;
      CASE_RATIO_DOUBLE_FLOAT {
        return ecl_make_double_float(ecl_to_double(x) + ecl_double_float(y));
      }
      CASE_RATIO_FIXNUM;
      CASE_RATIO_BIGNUM {
        cl_object z = ecl_times(x->ratio.den, y);
        z = ecl_plus(x->ratio.num, z);
        return ecl_make_ratio(z, x->ratio.den);
      }
      CASE_RATIO_RATIO {
        cl_object z1 = ecl_times(x->ratio.num,y->ratio.den);
        cl_object z = ecl_times(x->ratio.den,y->ratio.num);
        z = ecl_plus(z1, z);
        z1 = ecl_times(x->ratio.den,y->ratio.den);
        return ecl_make_ratio(z, z1);
      }
      CASE_SINGLE_FLOAT_FIXNUM {
        return ecl_make_single_float(ecl_single_float(x) + ecl_fixnum(y));
      }
      CASE_SINGLE_FLOAT_BIGNUM;
      CASE_SINGLE_FLOAT_RATIO {
        return ecl_make_single_float(ecl_single_float(x) + ecl_to_float(y));
      }
      CASE_SINGLE_FLOAT_SINGLE_FLOAT {
        return ecl_make_single_float(ecl_single_float(x) + ecl_single_float(y));
      }
      CASE_SINGLE_FLOAT_DOUBLE_FLOAT {
        return ecl_make_double_float(ecl_single_float(x) + ecl_double_float(y));
      }
      CASE_DOUBLE_FLOAT_FIXNUM {
        return ecl_make_double_float(ecl_double_float(x) + ecl_fixnum(y));
      }
      CASE_DOUBLE_FLOAT_BIGNUM;
      CASE_DOUBLE_FLOAT_RATIO {
        return ecl_make_double_float(ecl_double_float(x) + ecl_to_double(y));
      }
      CASE_DOUBLE_FLOAT_SINGLE_FLOAT {
        return ecl_make_double_float(ecl_double_float(x) + ecl_single_float(y));
      }
      CASE_DOUBLE_FLOAT_DOUBLE_FLOAT {
        return ecl_make_double_float(ecl_double_float(x) + ecl_double_float(y));
      }
#ifdef ECL_LONG_FLOAT
      CASE_FIXNUM_LONG_FLOAT {
        return ecl_make_long_float(ecl_fixnum(x) + ecl_long_float(y));
      }
      CASE_BIGNUM_LONG_FLOAT {
        return ecl_make_long_float(ecl_to_long_double(x) + ecl_long_float(y));
      }
      CASE_RATIO_LONG_FLOAT {
        return ecl_make_long_float(ecl_to_long_double(x) + ecl_long_float(y));
      }
      CASE_SINGLE_FLOAT_LONG_FLOAT {
        return ecl_make_long_float(ecl_single_float(x) + ecl_long_float(y));
      }
      CASE_DOUBLE_FLOAT_LONG_FLOAT {
        return ecl_make_long_float(ecl_double_float(x) + ecl_long_float(y));
      }
      CASE_LONG_FLOAT_FIXNUM {
        return ecl_make_long_float(ecl_long_float(x) + ecl_fixnum(y));
      }
      CASE_LONG_FLOAT_BIGNUM;
      CASE_LONG_FLOAT_RATIO {
        return ecl_make_long_float(ecl_long_float(x) + ecl_to_long_double(y));
      }
      CASE_LONG_FLOAT_SINGLE_FLOAT {
        return ecl_make_long_float(ecl_long_float(x) + ecl_single_float(y));
      }
      CASE_LONG_FLOAT_DOUBLE_FLOAT {
        return ecl_make_long_float(ecl_long_float(x) + ecl_double_float(y));
      }
      CASE_LONG_FLOAT_LONG_FLOAT {
        return ecl_make_long_float(ecl_long_float(x) + ecl_long_float(y));
      }
      CASE_LONG_FLOAT_COMPLEX {
        goto COMPLEX_Y;
      }
      CASE_COMPLEX_LONG_FLOAT;  {
        goto COMPLEX_X;
      }
#endif
      CASE_COMPLEX_FIXNUM;
      CASE_COMPLEX_BIGNUM;
      CASE_COMPLEX_RATIO;
      CASE_COMPLEX_SINGLE_FLOAT;
      CASE_COMPLEX_DOUBLE_FLOAT; COMPLEX_X: {
        cl_object aux = x;
        x = y; y = aux;
        goto COMPLEX_Y;
      }
      CASE_BIGNUM_COMPLEX;
      CASE_RATIO_COMPLEX;
      CASE_SINGLE_FLOAT_COMPLEX;
      CASE_DOUBLE_FLOAT_COMPLEX;
      CASE_FIXNUM_COMPLEX {
      COMPLEX_Y:
        return ecl_make_complex(ecl_plus(x, y->complex.real),
                                y->complex.imag);
      }
      CASE_COMPLEX_COMPLEX {
        cl_object z = ecl_plus(x->complex.real, y->complex.real);
        cl_object z1 = ecl_plus(x->complex.imag, y->complex.imag);
        return ecl_make_complex(z, z1);
      }
      CASE_UNKNOWN(@[+],x,y,@[number]);
    }
  MATH_DISPATCH2_END;
}

#else

cl_object
ecl_plus(cl_object x, cl_object y)
{
  cl_fixnum i, j;
  cl_object z, z1;

  switch (ecl_t_of(x)) {
  case t_fixnum:
    switch (ecl_t_of(y)) {
    case t_fixnum:
      return ecl_make_integer(ecl_fixnum(x) + ecl_fixnum(y));
    case t_bignum:
      return _ecl_big_plus_fix(y, ecl_fixnum(x));
    case t_ratio:
      z = ecl_times(x, y->ratio.den);
      z = ecl_plus(z, y->ratio.num);
      return ecl_make_ratio(z, y->ratio.den);
    case t_singlefloat:
      return ecl_make_single_float(ecl_fixnum(x) + ecl_single_float(y));
    case t_doublefloat:
      return ecl_make_double_float(ecl_fixnum(x) + ecl_double_float(y));
#ifdef ECL_LONG_FLOAT
    case t_longfloat:
      return ecl_make_long_float(ecl_fixnum(x) + ecl_long_float(y));
#endif
    case t_complex:
    COMPLEX: /* INV: x is real, y is complex */
      return ecl_make_complex(ecl_plus(x, y->complex.real),
                              y->complex.imag);
    default:
      FEwrong_type_nth_arg(@[+], 2, y, @[number]);
    }
  case t_bignum:
    switch (ecl_t_of(y)) {
    case t_fixnum:
      return _ecl_big_plus_fix(x, ecl_fixnum(y));
    case t_bignum:
      return _ecl_big_plus_big(x, y);
    case t_ratio:
      z = ecl_times(x, y->ratio.den);
      z = ecl_plus(z, y->ratio.num);
      return ecl_make_ratio(z, y->ratio.den);
    case t_singlefloat:
      return ecl_make_single_float(ecl_to_double(x) + ecl_single_float(y));
    case t_doublefloat:
      return ecl_make_double_float(ecl_to_double(x) + ecl_double_float(y));
#ifdef ECL_LONG_FLOAT
    case t_longfloat:
      return ecl_make_long_float(ecl_to_double(x) + ecl_long_float(y));
#endif
    case t_complex:
      goto COMPLEX;
    default:
      FEwrong_type_nth_arg(@[+], 2, y, @[number]);
    }
  case t_ratio:
    switch (ecl_t_of(y)) {
    case t_fixnum:
    case t_bignum:
      z = ecl_times(x->ratio.den, y);
      z = ecl_plus(x->ratio.num, z);
      return ecl_make_ratio(z, x->ratio.den);
    case t_ratio:
      z1 = ecl_times(x->ratio.num,y->ratio.den);
      z = ecl_times(x->ratio.den,y->ratio.num);
      z = ecl_plus(z1, z);
      z1 = ecl_times(x->ratio.den,y->ratio.den);
      return ecl_make_ratio(z, z1);
    case t_singlefloat:
      return ecl_make_single_float(ecl_to_double(x) + ecl_single_float(y));
    case t_doublefloat:
      return ecl_make_double_float(ecl_to_double(x) + ecl_double_float(y));
#ifdef ECL_LONG_FLOAT
    case t_longfloat:
      return ecl_make_long_float(ecl_to_double(x) + ecl_long_float(y));
#endif
    case t_complex:
      goto COMPLEX;
    default:
      FEwrong_type_nth_arg(@[+], 2, y, @[number]);
    }
  case t_singlefloat:
    switch (ecl_t_of(y)) {
    case t_fixnum:
      return ecl_make_single_float(ecl_single_float(x) + ecl_fixnum(y));
    case t_bignum:
    case t_ratio:
      return ecl_make_single_float(ecl_single_float(x) + ecl_to_double(y));
    case t_singlefloat:
      return ecl_make_single_float(ecl_single_float(x) + ecl_single_float(y));
    case t_doublefloat:
      return ecl_make_double_float(ecl_single_float(x) + ecl_double_float(y));
#ifdef ECL_LONG_FLOAT
    case t_longfloat:
      return ecl_make_long_float(ecl_single_float(x) + ecl_long_float(y));
#endif
    case t_complex:
      goto COMPLEX;
    default:
      FEwrong_type_nth_arg(@[+], 2, y, @[number]);
    }
  case t_doublefloat:
    switch (ecl_t_of(y)) {
    case t_fixnum:
      return ecl_make_double_float(ecl_double_float(x) + ecl_fixnum(y));
    case t_bignum:
    case t_ratio:
      return ecl_make_double_float(ecl_double_float(x) + ecl_to_double(y));
    case t_singlefloat:
      return ecl_make_double_float(ecl_double_float(x) + ecl_single_float(y));
    case t_doublefloat:
      return ecl_make_double_float(ecl_double_float(x) + ecl_double_float(y));
#ifdef ECL_LONG_FLOAT
    case t_longfloat:
      return ecl_make_long_float(ecl_double_float(x) + ecl_long_float(y));
#endif
    case t_complex:
      goto COMPLEX;
    default:
      FEwrong_type_nth_arg(@[+], 2, y, @[number]);
    }
#ifdef ECL_LONG_FLOAT
  case t_longfloat:
    switch (ecl_t_of(y)) {
    case t_fixnum:
      return ecl_make_long_float(ecl_long_float(x) + ecl_fixnum(y));
    case t_bignum:
    case t_ratio:
      return ecl_make_long_float(ecl_long_float(x) + ecl_to_double(y));
    case t_singlefloat:
      return ecl_make_long_float(ecl_long_float(x) + ecl_single_float(y));
    case t_doublefloat:
      return ecl_make_long_float(ecl_long_float(x) + ecl_double_float(y));
    case t_longfloat:
      return ecl_make_long_float(ecl_long_float(x) + ecl_long_float(y));
    case t_complex:
      goto COMPLEX;
    default:
      FEwrong_type_nth_arg(@[+], 2, y, @[number]);
    }
#endif
  case t_complex:
    if (ecl_t_of(y) != t_complex) {
      cl_object aux = x;
      x = y; y = aux;
      goto COMPLEX;
    }
    z = ecl_plus(x->complex.real, y->complex.real);
    z1 = ecl_plus(x->complex.imag, y->complex.imag);
    return ecl_make_complex(z, z1);
  default:
    FEwrong_type_nth_arg(@[+], 1, x, @[number]);
  }
}
#endif
