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/* 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 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.
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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library. If not, see http://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);
}
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