X-Git-Url: https://git.hcoop.net/bpt/guile.git/blobdiff_plain/a1ec69163dd2e55e5d2b03a164513aa4a0d5943c..877f06c33829ac2a5ba263826454f880d5460ee8:/libguile/pairs.c diff --git a/libguile/pairs.c b/libguile/pairs.c dissimilarity index 78% index aab418815..cb2d64260 100644 --- a/libguile/pairs.c +++ b/libguile/pairs.c @@ -1,165 +1,208 @@ -/* Copyright (C) 1995,1996 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 -#include "_scm.h" - - -#include "scm_validate.h" - - - -/* {Pairs} - */ - -SCM_DEFINE(scm_cons, "cons", 2, 0, 0, - (SCM x, SCM y), -"") -#define FUNC_NAME s_scm_cons -{ - register SCM z; - SCM_NEWCELL (z); - SCM_SETCAR (z, x); - SCM_SETCDR (z, y); - return z; -} -#undef FUNC_NAME - - -SCM -scm_cons2 (SCM w, SCM x, SCM y) -{ - register SCM z; - SCM_NEWCELL (z); - SCM_SETCAR (z, x); - SCM_SETCDR (z, y); - x = z; - SCM_NEWCELL (z); - SCM_SETCAR (z, w); - SCM_SETCDR (z, x); - return z; -} - - -SCM_DEFINE (scm_pair_p, "pair?", 1, 0, 0, - (SCM x), -"") -#define FUNC_NAME s_scm_pair_p -{ - if (SCM_IMP (x)) - return SCM_BOOL_F; - return SCM_BOOL(SCM_CONSP (x)); -} -#undef FUNC_NAME - -SCM_DEFINE (scm_set_car_x, "set-car!", 2, 0, 0, - (SCM pair, SCM value), -"") -#define FUNC_NAME s_scm_set_car_x -{ - SCM_VALIDATE_CONS(1,pair); - SCM_SETCAR (pair, value); - return SCM_UNSPECIFIED; -} -#undef FUNC_NAME - -SCM_DEFINE (scm_set_cdr_x, "set-cdr!", 2, 0, 0, - (SCM pair, SCM value), -"") -#define FUNC_NAME s_scm_set_cdr_x -{ - SCM_VALIDATE_CONS(1,pair); - SCM_SETCDR (pair, value); - return SCM_UNSPECIFIED; -} -#undef FUNC_NAME - - - - -static const scm_iproc cxrs[] = -{ - {"car", 0}, - {"cdr", 0}, - {"caar", 0}, - {"cadr", 0}, - {"cdar", 0}, - {"cddr", 0}, - {"caaar", 0}, - {"caadr", 0}, - {"cadar", 0}, - {"caddr", 0}, - {"cdaar", 0}, - {"cdadr", 0}, - {"cddar", 0}, - {"cdddr", 0}, - {"caaaar", 0}, - {"caaadr", 0}, - {"caadar", 0}, - {"caaddr", 0}, - {"cadaar", 0}, - {"cadadr", 0}, - {"caddar", 0}, - {"cadddr", 0}, - {"cdaaar", 0}, - {"cdaadr", 0}, - {"cdadar", 0}, - {"cdaddr", 0}, - {"cddaar", 0}, - {"cddadr", 0}, - {"cdddar", 0}, - {"cddddr", 0}, - {0, 0} -}; - - - -void -scm_init_pairs () -{ - scm_init_iprocs (cxrs, scm_tc7_cxr); -#include "pairs.x" -} - +/* Copyright (C) 1995,1996,2000,2001, 2004, 2005, 2006, 2008 Free Software Foundation, Inc. + * + * This 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 2.1 of the License, or (at your option) any later version. + * + * This 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 this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + + + +#ifdef HAVE_CONFIG_H +# include +#endif + +#include "libguile/_scm.h" +#include "libguile/validate.h" + +#include "libguile/pairs.h" + + + +/* {Pairs} + */ + +#if (SCM_DEBUG_PAIR_ACCESSES == 1) + +#include "libguile/ports.h" +#include "libguile/strings.h" + +void scm_error_pair_access (SCM non_pair) +{ + static unsigned int running = 0; + SCM message = scm_from_locale_string ("Non-pair accessed with SCM_C[AD]R: `~S'\n"); + + if (!running) + { + running = 1; + scm_simple_format (scm_current_error_port (), + message, scm_list_1 (non_pair)); + abort (); + } +} + +#endif + +SCM_DEFINE (scm_cons, "cons", 2, 0, 0, + (SCM x, SCM y), + "Return a newly allocated pair whose car is @var{x} and whose\n" + "cdr is @var{y}. The pair is guaranteed to be different (in the\n" + "sense of @code{eq?}) from every previously existing object.") +#define FUNC_NAME s_scm_cons +{ + return scm_cell (SCM_UNPACK (x), SCM_UNPACK (y)); +} +#undef FUNC_NAME + + +SCM +scm_cons2 (SCM w, SCM x, SCM y) +{ + return scm_cons (w, scm_cons (x, y)); +} + + +SCM_DEFINE (scm_pair_p, "pair?", 1, 0, 0, + (SCM x), + "Return @code{#t} if @var{x} is a pair; otherwise return\n" + "@code{#f}.") +#define FUNC_NAME s_scm_pair_p +{ + return scm_from_bool (scm_is_pair (x)); +} +#undef FUNC_NAME + +SCM +scm_car (SCM pair) +{ + if (!scm_is_pair (pair)) + scm_wrong_type_arg_msg (NULL, 0, pair, "pair"); + return SCM_CAR (pair); +} + +SCM +scm_cdr (SCM pair) +{ + if (!scm_is_pair (pair)) + scm_wrong_type_arg_msg (NULL, 0, pair, "pair"); + return SCM_CDR (pair); +} + +SCM +scm_i_chase_pairs (SCM tree, scm_t_uint32 pattern) +{ + do + { + if (!scm_is_pair (tree)) + scm_wrong_type_arg_msg (NULL, 0, tree, "pair"); + tree = (pattern & 1) ? SCM_CAR (tree) : SCM_CDR (tree); + pattern >>= 2; + } + while (pattern); + return tree; +} + +SCM_DEFINE (scm_set_car_x, "set-car!", 2, 0, 0, + (SCM pair, SCM value), + "Stores @var{value} in the car field of @var{pair}. The value returned\n" + "by @code{set-car!} is unspecified.") +#define FUNC_NAME s_scm_set_car_x +{ + SCM_VALIDATE_CONS (1, pair); + SCM_SETCAR (pair, value); + return SCM_UNSPECIFIED; +} +#undef FUNC_NAME + + +SCM_DEFINE (scm_set_cdr_x, "set-cdr!", 2, 0, 0, + (SCM pair, SCM value), + "Stores @var{value} in the cdr field of @var{pair}. The value returned\n" + "by @code{set-cdr!} is unspecified.") +#define FUNC_NAME s_scm_set_cdr_x +{ + SCM_VALIDATE_CONS (1, pair); + SCM_SETCDR (pair, value); + return SCM_UNSPECIFIED; +} +#undef FUNC_NAME + + + +/* Every cxr-pattern is made up of pairs of bits, starting with the two least + * significant bits. If in a pair of bits the least significant of the two + * bits is 0, this means CDR, otherwise CAR. The most significant bits of the + * two bits is only needed to indicate when cxr-ing is ready. This is the + * case, when all remaining pairs of bits equal 00. */ + +typedef struct { + const char *name; + unsigned char pattern; +} t_cxr; + +static const t_cxr cxrs[] = +{ + {"cdr", 0x02}, /* 00000010 */ + {"car", 0x03}, /* 00000011 */ + {"cddr", 0x0a}, /* 00001010 */ + {"cdar", 0x0b}, /* 00001011 */ + {"cadr", 0x0e}, /* 00001110 */ + {"caar", 0x0f}, /* 00001111 */ + {"cdddr", 0x2a}, /* 00101010 */ + {"cddar", 0x2b}, /* 00101011 */ + {"cdadr", 0x2e}, /* 00101110 */ + {"cdaar", 0x2f}, /* 00101111 */ + {"caddr", 0x3a}, /* 00111010 */ + {"cadar", 0x3b}, /* 00111011 */ + {"caadr", 0x3e}, /* 00111110 */ + {"caaar", 0x3f}, /* 00111111 */ + {"cddddr", 0xaa}, /* 10101010 */ + {"cdddar", 0xab}, /* 10101011 */ + {"cddadr", 0xae}, /* 10101110 */ + {"cddaar", 0xaf}, /* 10101111 */ + {"cdaddr", 0xba}, /* 10111010 */ + {"cdadar", 0xbb}, /* 10111011 */ + {"cdaadr", 0xbe}, /* 10111110 */ + {"cdaaar", 0xbf}, /* 10111111 */ + {"cadddr", 0xea}, /* 11101010 */ + {"caddar", 0xeb}, /* 11101011 */ + {"cadadr", 0xee}, /* 11101110 */ + {"cadaar", 0xef}, /* 11101111 */ + {"caaddr", 0xfa}, /* 11111010 */ + {"caadar", 0xfb}, /* 11111011 */ + {"caaadr", 0xfe}, /* 11111110 */ + {"caaaar", 0xff}, /* 11111111 */ + {0, 0} +}; + + + +void +scm_init_pairs () +{ + unsigned int subnr = 0; + + for (subnr = 0; cxrs[subnr].name; subnr++) + { + SCM (*pattern) () = (SCM (*) ()) (scm_t_bits) cxrs[subnr].pattern; + scm_c_define_subr (cxrs[subnr].name, scm_tc7_cxr, pattern); + } + +#include "libguile/pairs.x" +} + + +/* + Local Variables: + c-file-style: "gnu" + End: +*/