/* mpq expression evaluation

Copyright 2000-2002 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP Library is free software; you can redistribute it and/or modify

it under the terms of either:

  * the GNU Lesser General Public License as published by the Free

    Software Foundation; either version 3 of the License, or (at your

    option) any later version.

or

  * 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.

or both in parallel, as here.

The GNU MP Library 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 copies of the GNU General Public License and the

GNU Lesser General Public License along with the GNU MP Library.  If not,

see https://www.gnu.org/licenses/.  */

#include <stdio.h>

#include <string.h>

#include "gmp.h"

#include "expr-impl.h"

/* Change this to "#define TRACE(x) x" to get some traces. */

#define TRACE(x)

static void

e_mpq_pow_ui (mpq_ptr r, mpq_srcptr b, unsigned long e)

{

  mpz_pow_ui (mpq_numref(r), mpq_numref(b), e);

  mpz_pow_ui (mpq_denref(r), mpq_denref(b), e);

}

/* Wrapped because mpq_sgn is a macro. */

static int

e_mpq_sgn (mpq_srcptr x)

{

  return mpq_sgn (x);

}

/* Wrapped because mpq_equal only guarantees a non-zero return, whereas we

   want 1 or 0 for == and !=. */

static int

e_mpq_equal (mpq_srcptr x, mpq_srcptr y)

{

  return mpq_equal (x, y) != 0;

}

static int

e_mpq_notequal (mpq_srcptr x, mpq_srcptr y)

{

  return ! mpq_equal (x, y);

}

static void

e_mpq_num (mpq_ptr w, mpq_srcptr x)

{

  if (w != x)

    mpz_set (mpq_numref(w), mpq_numref(x));

  mpz_set_ui (mpq_denref(w), 1L);

}

static void

e_mpq_den (mpq_ptr w, mpq_srcptr x)

{

  if (w == x)

    mpz_swap (mpq_numref(w), mpq_denref(w));

  else

    mpz_set (mpq_numref(w), mpq_denref(x));

  mpz_set_ui (mpq_denref(w), 1L);

}

static const struct mpexpr_operator_t  _mpq_expr_standard_table[] = {

  { "**",  (mpexpr_fun_t) e_mpq_pow_ui,

    MPEXPR_TYPE_BINARY_UI | MPEXPR_TYPE_RIGHTASSOC,                   220 },

  { "!",   (mpexpr_fun_t) e_mpq_sgn,

    MPEXPR_TYPE_LOGICAL_NOT | MPEXPR_TYPE_PREFIX,                     210 },

  { "-",   (mpexpr_fun_t) mpq_neg,

    MPEXPR_TYPE_UNARY | MPEXPR_TYPE_PREFIX,                           210 },

  { "*",   (mpexpr_fun_t) mpq_mul,           MPEXPR_TYPE_BINARY,      200 },

  { "/",   (mpexpr_fun_t) mpq_div,           MPEXPR_TYPE_BINARY,      200 },

  { "+",   (mpexpr_fun_t) mpq_add,           MPEXPR_TYPE_BINARY,      190 },

  { "-",   (mpexpr_fun_t) mpq_sub,           MPEXPR_TYPE_BINARY,      190 },

  { "<<",  (mpexpr_fun_t) mpq_mul_2exp,      MPEXPR_TYPE_BINARY_UI,   180 },

  { ">>",  (mpexpr_fun_t) mpq_div_2exp,      MPEXPR_TYPE_BINARY_UI,   180 },

  { "<=",  (mpexpr_fun_t) mpq_cmp,           MPEXPR_TYPE_CMP_LE,      170 },

  { "<",   (mpexpr_fun_t) mpq_cmp,           MPEXPR_TYPE_CMP_LT,      170 },

  { ">=",  (mpexpr_fun_t) mpq_cmp,           MPEXPR_TYPE_CMP_GE,      170 },

  { ">",   (mpexpr_fun_t) mpq_cmp,           MPEXPR_TYPE_CMP_GT,      170 },

  { "==",  (mpexpr_fun_t) e_mpq_equal,       MPEXPR_TYPE_I_BINARY,    160 },

  { "!=",  (mpexpr_fun_t) e_mpq_notequal,    MPEXPR_TYPE_I_BINARY,    160 },

  { "&&",  (mpexpr_fun_t) e_mpq_sgn,         MPEXPR_TYPE_LOGICAL_AND, 120 },

  { "||",  (mpexpr_fun_t) e_mpq_sgn,         MPEXPR_TYPE_LOGICAL_OR,  110 },

  { ":",   NULL,                             MPEXPR_TYPE_COLON,       101 },

  { "?",   (mpexpr_fun_t) e_mpq_sgn,         MPEXPR_TYPE_QUESTION,    100 },

  { ")",   (mpexpr_fun_t) e_mpq_sgn,         MPEXPR_TYPE_CLOSEPAREN,    4 },

  { "(",   (mpexpr_fun_t) e_mpq_sgn,         MPEXPR_TYPE_OPENPAREN,     3 },

  { ",",   (mpexpr_fun_t) e_mpq_sgn,         MPEXPR_TYPE_ARGSEP,        2 },

  { "$",   NULL,                             MPEXPR_TYPE_VARIABLE,      1 },

  { "abs",  (mpexpr_fun_t) mpq_abs,          MPEXPR_TYPE_UNARY            },

  { "cmp",  (mpexpr_fun_t) mpq_cmp,          MPEXPR_TYPE_I_BINARY         },

  { "den",  (mpexpr_fun_t) e_mpq_den,        MPEXPR_TYPE_UNARY            },

  { "max",  (mpexpr_fun_t) mpq_cmp,  MPEXPR_TYPE_MAX | MPEXPR_TYPE_PAIRWISE },

  { "min",  (mpexpr_fun_t) mpq_cmp,  MPEXPR_TYPE_MIN | MPEXPR_TYPE_PAIRWISE },

  { "num",  (mpexpr_fun_t) e_mpq_num,        MPEXPR_TYPE_UNARY            },

  { "sgn",  (mpexpr_fun_t) e_mpq_sgn,        MPEXPR_TYPE_I_UNARY          },

  { NULL }

};

const struct mpexpr_operator_t * const mpq_expr_standard_table

= _mpq_expr_standard_table;

int

mpq_expr (mpq_ptr res, int base, const char *e, ...)

{

  mpq_srcptr  var[MPEXPR_VARIABLES];

  va_list     ap;

  int         ret;

  va_start (ap, e);

  TRACE (printf ("mpq_expr(): base %d, %s\n", base, e));

  ret = mpexpr_va_to_var ((void **) var, ap);

  va_end (ap);

  if (ret != MPEXPR_RESULT_OK)

    return ret;

  return mpq_expr_a (mpq_expr_standard_table, res, base, e, strlen(e), var);

}