/* 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 #include "_scm.h" #include "scm_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_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_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_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" }