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/* mpq expression evaluation
Copyright 2000, 2001, 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 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 <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 __gmp_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 }
};
__gmp_const struct mpexpr_operator_t * __gmp_const mpq_expr_standard_table
= _mpq_expr_standard_table;
int
#if HAVE_STDARG
mpq_expr (mpq_ptr res, int base, __gmp_const char *e, ...)
#else
mpq_expr (va_alist)
va_dcl
#endif
{
mpq_srcptr var[MPEXPR_VARIABLES];
va_list ap;
int ret;
#if HAVE_STDARG
va_start (ap, e);
#else
mpq_ptr res;
int base;
__gmp_const char *e;
va_start (ap);
res = va_arg (ap, mpq_ptr);
base = va_arg (ap, int);
e = va_arg (ap, __gmp_const char *);
#endif
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);
}
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