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/* Copyright (C) 1995,1996,1998 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, Free Software Foundation gives permission
* for additional uses of the text contained in its release of this library.
*
* The exception is that, if you link this 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 this 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
* Free Software Foundation as part of this library. If you copy
* code from other releases distributed under the terms of the GPL into a copy of
* this library, 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 such code.
*
* If you write modifications of your own for this library, 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 <stdio.h>
#include "_scm.h"
#include "validate.h"
#include "weaks.h"
/* {Weak Vectors}
*/
SCM_DEFINE (scm_make_weak_vector, "make-weak-vector", 1, 1, 0,
(SCM k, SCM fill),
"Return a weak vector with @var{size} elements. If the optional\n"
"argument @var{fill} is given, all entries in the vector will be set to\n"
"@var{fill}. The default value for @var{fill} is the empty list.")
#define FUNC_NAME s_scm_make_weak_vector
{
SCM v;
v = scm_make_vector (scm_sum (k, SCM_MAKINUM (2)), fill);
SCM_DEFER_INTS;
SCM_SETLENGTH(v, SCM_INUM (k), scm_tc7_wvect);
SCM_VELTS(v)[0] = SCM_EOL;
SCM_VELTS(v)[1] = (SCM)0;
SCM_SETVELTS(v, SCM_VELTS(v) + 2);
SCM_ALLOW_INTS;
return v;
}
#undef FUNC_NAME
SCM_REGISTER_PROC(s_list_to_weak_vector, "list->weak-vector", 1, 0, 0, scm_weak_vector);
SCM_DEFINE (scm_weak_vector, "weak-vector", 0, 0, 1,
(SCM l),
"@deffnx primitive list->weak-vector l\n"
"Construct a weak vector from a list: @code{weak-vector} uses the list of\n"
"its arguments while @code{list->weak-vector} uses its only argument\n"
"@var{l} (a list) to construct a weak vector the same way\n"
"@code{vector->list} would.")
#define FUNC_NAME s_scm_weak_vector
{
SCM res;
register SCM *data;
long i;
i = scm_ilength (l);
SCM_ASSERT (i >= 0, l, SCM_ARG1, FUNC_NAME);
res = scm_make_weak_vector (SCM_MAKINUM (i), SCM_UNSPECIFIED);
data = SCM_VELTS (res);
for (;
i && SCM_CONSP (l);
--i, l = SCM_CDR (l))
*data++ = SCM_CAR (l);
return res;
}
#undef FUNC_NAME
SCM_DEFINE (scm_weak_vector_p, "weak-vector?", 1, 0, 0,
(SCM x),
"Return @var{#t} if @var{obj} is a weak vector. Note that all weak\n"
"hashes are also weak vectors.")
#define FUNC_NAME s_scm_weak_vector_p
{
return SCM_BOOL(SCM_WVECTP (x) && !SCM_IS_WHVEC (x));
}
#undef FUNC_NAME
SCM_DEFINE (scm_make_weak_key_hash_table, "make-weak-key-hash-table", 1, 0, 0,
(SCM k),
"@deffnx primitive make-weak-value-hash-table size\n"
"@deffnx primitive make-doubly-weak-hash-table size\n"
"Return a weak hash table with @var{size} buckets. As with any hash\n"
"table, choosing a good size for the table requires some caution.\n\n"
"You can modify weak hash tables in exactly the same way you would modify\n"
"regular hash tables. (@pxref{Hash Tables})")
#define FUNC_NAME s_scm_make_weak_key_hash_table
{
SCM v;
SCM_VALIDATE_INUM (1,k);
v = scm_make_weak_vector (k, SCM_EOL);
SCM_ALLOW_INTS;
SCM_ASWORD (SCM_VELTS (v)[-1]) = 1;
SCM_ALLOW_INTS;
return v;
}
#undef FUNC_NAME
SCM_DEFINE (scm_make_weak_value_hash_table, "make-weak-value-hash-table", 1, 0, 0,
(SCM k),
"")
#define FUNC_NAME s_scm_make_weak_value_hash_table
{
SCM v;
SCM_VALIDATE_INUM (1,k);
v = scm_make_weak_vector (k, SCM_EOL);
SCM_ALLOW_INTS;
SCM_ASWORD (SCM_VELTS (v)[-1]) = 2;
SCM_ALLOW_INTS;
return v;
}
#undef FUNC_NAME
SCM_DEFINE (scm_make_doubly_weak_hash_table, "make-doubly-weak-hash-table", 1, 0, 0,
(SCM k),
"")
#define FUNC_NAME s_scm_make_doubly_weak_hash_table
{
SCM v;
SCM_VALIDATE_INUM (1,k);
v = scm_make_weak_vector (k, SCM_EOL);
SCM_ALLOW_INTS;
SCM_ASWORD (SCM_VELTS (v)[-1]) = 3;
SCM_ALLOW_INTS;
return v;
}
#undef FUNC_NAME
SCM_DEFINE (scm_weak_key_hash_table_p, "weak-key-hash-table?", 1, 0, 0,
(SCM x),
"@deffnx primitive weak-value-hash-table? obj\n"
"@deffnx primitive doubly-weak-hash-table? obj\n"
"Return @var{#t} if @var{obj} is the specified weak hash table. Note\n"
"that a doubly weak hash table is neither a weak key nor a weak value\n"
"hash table.")
#define FUNC_NAME s_scm_weak_key_hash_table_p
{
return SCM_BOOL(SCM_WVECTP (x) && SCM_IS_WHVEC(x));
}
#undef FUNC_NAME
SCM_DEFINE (scm_weak_value_hash_table_p, "weak-value-hash-table?", 1, 0, 0,
(SCM x),
"")
#define FUNC_NAME s_scm_weak_value_hash_table_p
{
return SCM_BOOL(SCM_WVECTP (x) && SCM_IS_WHVEC_V(x));
}
#undef FUNC_NAME
SCM_DEFINE (scm_doubly_weak_hash_table_p, "doubly-weak-hash-table?", 1, 0, 0,
(SCM x),
"")
#define FUNC_NAME s_scm_doubly_weak_hash_table_p
{
return SCM_BOOL(SCM_WVECTP (x) && SCM_IS_WHVEC_B (x));
}
#undef FUNC_NAME
void
scm_init_weaks ()
{
#include "weaks.x"
}
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