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/* Copyright (C) 1995,1996,1997,1998,2000,2001 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
#include "libguile/_scm.h"
#include "libguile/ramap.h"
#include "libguile/stackchk.h"
#include "libguile/strorder.h"
#include "libguile/async.h"
#include "libguile/root.h"
#include "libguile/smob.h"
#include "libguile/unif.h"
#include "libguile/vectors.h"
#include "libguile/validate.h"
#include "libguile/eq.h"
SCM_DEFINE1 (scm_eq_p, "eq?", scm_tc7_rpsubr,
(SCM x, SCM y),
"Return @code{#t} iff @var{x} references the same object as @var{y}.\n"
"@code{eq?} is similar to @code{eqv?} except that in some cases it is\n"
"capable of discerning distinctions finer than those detectable by\n"
"@code{eqv?}.")
#define FUNC_NAME s_scm_eq_p
{
return SCM_BOOL (SCM_EQ_P (x, y));
}
#undef FUNC_NAME
SCM_DEFINE1 (scm_eqv_p, "eqv?", scm_tc7_rpsubr,
(SCM x, SCM y),
"The @code{eqv?} procedure defines a useful equivalence relation on objects.\n"
"Briefly, it returns @code{#t} if @var{x} and @var{y} should normally be\n"
"regarded as the same object. This relation is left slightly open to\n"
"interpretation, but works for comparing immediate integers, characters,\n"
"and inexact numbers.")
#define FUNC_NAME s_scm_eqv_p
{
if (SCM_EQ_P (x, y))
return SCM_BOOL_T;
if (SCM_IMP (x))
return SCM_BOOL_F;
if (SCM_IMP (y))
return SCM_BOOL_F;
/* this ensures that types and scm_length are the same. */
if (SCM_CELL_TYPE (x) != SCM_CELL_TYPE (y))
{
/* treat mixes of real and complex types specially */
if (SCM_SLOPPY_INEXACTP (x))
{
if (SCM_SLOPPY_REALP (x))
return SCM_BOOL (SCM_SLOPPY_COMPLEXP (y)
&& SCM_REAL_VALUE (x) == SCM_COMPLEX_REAL (y)
&& 0.0 == SCM_COMPLEX_IMAG (y));
else
return SCM_BOOL (SCM_SLOPPY_REALP (y)
&& SCM_COMPLEX_REAL (x) == SCM_REAL_VALUE (y)
&& SCM_COMPLEX_IMAG (x) == 0.0);
}
return SCM_BOOL_F;
}
if (SCM_NUMP (x))
{
if (SCM_BIGP (x)) {
return SCM_BOOL (0 == scm_bigcomp (x, y));
} else if (SCM_SLOPPY_REALP (x)) {
return SCM_BOOL (SCM_REAL_VALUE (x) == SCM_REAL_VALUE (y));
} else { /* complex */
return SCM_BOOL (SCM_COMPLEX_REAL (x) == SCM_COMPLEX_REAL (y)
&& SCM_COMPLEX_IMAG (x) == SCM_COMPLEX_IMAG (y));
}
}
return SCM_BOOL_F;
}
#undef FUNC_NAME
SCM_DEFINE1 (scm_equal_p, "equal?", scm_tc7_rpsubr,
(SCM x, SCM y),
"Return @code{#t} iff @var{x} and @var{y} are recursively @code{eqv?} equivalent.\n"
"@code{equal?} recursively compares the contents of pairs,\n"
"vectors, and strings, applying @code{eqv?} on other objects such as\n"
"numbers and symbols. A rule of thumb is that objects are generally\n"
"@code{equal?} if they print the same. @code{equal?} may fail to\n"
"terminate if its arguments are circular data structures.")
#define FUNC_NAME s_scm_equal_p
{
SCM_CHECK_STACK;
tailrecurse:
SCM_TICK;
if (SCM_EQ_P (x, y))
return SCM_BOOL_T;
if (SCM_IMP (x))
return SCM_BOOL_F;
if (SCM_IMP (y))
return SCM_BOOL_F;
if (SCM_CONSP (x) && SCM_CONSP (y))
{
if (SCM_FALSEP (scm_equal_p (SCM_CAR (x), SCM_CAR (y))))
return SCM_BOOL_F;
x = SCM_CDR(x);
y = SCM_CDR(y);
goto tailrecurse;
}
if (SCM_TYP7S (x) == scm_tc7_string && SCM_TYP7S (y) == scm_tc7_string)
return scm_string_equal_p (x, y);
/* This ensures that types and scm_length are the same. */
if (SCM_CELL_TYPE (x) != SCM_CELL_TYPE (y))
{
/* treat mixes of real and complex types specially */
if (SCM_SLOPPY_INEXACTP (x))
{
if (SCM_SLOPPY_REALP (x))
return SCM_BOOL (SCM_SLOPPY_COMPLEXP (y)
&& SCM_REAL_VALUE (x) == SCM_COMPLEX_REAL (y)
&& 0.0 == SCM_COMPLEX_IMAG (y));
else
return SCM_BOOL (SCM_SLOPPY_REALP (y)
&& SCM_COMPLEX_REAL (x) == SCM_REAL_VALUE (y)
&& SCM_COMPLEX_IMAG (x) == 0.0);
}
return SCM_BOOL_F;
}
switch (SCM_TYP7 (x))
{
default:
return SCM_BOOL_F;
case scm_tc7_vector:
case scm_tc7_wvect:
return scm_vector_equal_p (x, y);
case scm_tc7_smob:
{
int i = SCM_SMOBNUM (x);
if (!(i < scm_numsmob))
return SCM_BOOL_F;
if (scm_smobs[i].equalp)
return (scm_smobs[i].equalp) (x, y);
else
return SCM_BOOL_F;
}
#ifdef HAVE_ARRAYS
case scm_tc7_bvect: case scm_tc7_uvect: case scm_tc7_ivect:
case scm_tc7_fvect: case scm_tc7_cvect: case scm_tc7_dvect:
case scm_tc7_svect:
#ifdef HAVE_LONG_LONGS
case scm_tc7_llvect:
#endif
case scm_tc7_byvect:
if (scm_tc16_array && scm_smobs[SCM_TC2SMOBNUM (scm_tc16_array)].equalp)
return scm_array_equal_p (x, y);
#endif
}
return SCM_BOOL_F;
}
#undef FUNC_NAME
void
scm_init_eq ()
{
#ifndef SCM_MAGIC_SNARFER
#include "libguile/eq.x"
#endif
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
|
