92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
/* mpq expression evaluation
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Copyright 2000, 2001, 2004 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <stdio.h>
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#include "gmp.h"
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#include "expr-impl.h"
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static int
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e_mpq_ulong_p (mpq_srcptr q)
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{
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return mpz_fits_ulong_p (mpq_numref (q))
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&& mpz_cmp_ui (mpq_denref (q), 1L) == 0;
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}
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/* get value as a ui, on the assumption it fits */
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static int
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e_mpq_get_ui_fits (mpq_srcptr q)
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{
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return mpz_get_ui (mpq_numref (q));
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}
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static void
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e_mpq_set_si1 (mpq_ptr q, long num)
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{
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mpq_set_si (q, num, 1L);
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}
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/* The same as mpz, but putting the result in the numerator. Negatives and
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fractions aren't parsed here because '-' and '/' are operators. */
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static size_t
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e_mpq_number (mpq_ptr res, __gmp_const char *e, size_t elen, int base)
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{
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mpz_set_ui (mpq_denref (res), 1L);
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return mpexpr_mpz_number (mpq_numref (res), e, elen, base);
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}
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/* ignoring prec */
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static void
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e_mpq_init (mpq_ptr q, unsigned long prec)
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{
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mpq_init (q);
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}
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int
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mpq_expr_a (__gmp_const struct mpexpr_operator_t *table,
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mpq_ptr res, int base,
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__gmp_const char *e, size_t elen,
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mpq_srcptr var[26])
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{
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struct mpexpr_parse_t p;
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p.table = table;
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p.res = (mpX_ptr) res;
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p.base = base;
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p.e = e;
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p.elen = elen;
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p.var = (mpX_srcptr *) var;
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p.mpX_clear = (mpexpr_fun_one_t) mpq_clear;
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p.mpX_ulong_p = (mpexpr_fun_i_unary_t) e_mpq_ulong_p;
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p.mpX_get_ui = (mpexpr_fun_get_ui_t) e_mpq_get_ui_fits;
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p.mpX_init = (mpexpr_fun_unary_ui_t) e_mpq_init;
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p.mpX_number = (mpexpr_fun_number_t) e_mpq_number;
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p.mpX_set = (mpexpr_fun_unary_t) mpq_set;
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p.mpX_set_or_swap = (mpexpr_fun_unary_t) mpq_swap;
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p.mpX_set_si = (mpexpr_fun_set_si_t) e_mpq_set_si1;
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p.mpX_swap = (mpexpr_fun_swap_t) mpq_swap;
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return mpexpr_evaluate (&p);
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}
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