/* mpq expression evaluation

Copyright 2000, 2001, 2004 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 "gmp.h"

#include "expr-impl.h"

static int

e_mpq_ulong_p (mpq_srcptr q)

{

  return mpz_fits_ulong_p (mpq_numref (q))

    && mpz_cmp_ui (mpq_denref (q), 1L) == 0;

}

/* get value as a ui, on the assumption it fits */

static int

e_mpq_get_ui_fits (mpq_srcptr q)

{

  return mpz_get_ui (mpq_numref (q));

}

static void

e_mpq_set_si1 (mpq_ptr q, long num)

{

  mpq_set_si (q, num, 1L);

}

/* The same as mpz, but putting the result in the numerator.  Negatives and

   fractions aren't parsed here because '-' and '/' are operators. */

static size_t

e_mpq_number (mpq_ptr res, const char *e, size_t elen, int base)

{

  mpz_set_ui (mpq_denref (res), 1L);

  return mpexpr_mpz_number (mpq_numref (res), e, elen, base);

}

/* ignoring prec */

static void

e_mpq_init (mpq_ptr q, unsigned long prec)

{

  mpq_init (q);

}

int

mpq_expr_a (const struct mpexpr_operator_t *table,

            mpq_ptr res, int base,

            const char *e, size_t elen,

            mpq_srcptr var[26])

{

  struct mpexpr_parse_t  p;

  p.table = table;

  p.res = (mpX_ptr) res;

  p.base = base;

  p.e = e;

  p.elen = elen;

  p.var = (mpX_srcptr *) var;

  p.mpX_clear       = (mpexpr_fun_one_t)      mpq_clear;

  p.mpX_ulong_p     = (mpexpr_fun_i_unary_t)  e_mpq_ulong_p;

  p.mpX_get_ui      = (mpexpr_fun_get_ui_t)   e_mpq_get_ui_fits;

  p.mpX_init        = (mpexpr_fun_unary_ui_t) e_mpq_init;

  p.mpX_number      = (mpexpr_fun_number_t)   e_mpq_number;

  p.mpX_set         = (mpexpr_fun_unary_t)    mpq_set;

  p.mpX_set_or_swap = (mpexpr_fun_unary_t)    mpq_swap;

  p.mpX_set_si      = (mpexpr_fun_set_si_t)   e_mpq_set_si1;

  p.mpX_swap        = (mpexpr_fun_swap_t)     mpq_swap;

  return mpexpr_evaluate (&p);

}