libguile/chars.c

   1 /*      Copyright (C) 1995,1996,1998, 2000, 2001 Free Software Foundation, Inc.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  16  * Boston, MA 02111-1307 USA
  17  *
  18  * As a special exception, the Free Software Foundation gives permission
  19  * for additional uses of the text contained in its release of GUILE.
  20  *
  21  * The exception is that, if you link the GUILE library with other files
  22  * to produce an executable, this does not by itself cause the
  23  * resulting executable to be covered by the GNU General Public License.
  24  * Your use of that executable is in no way restricted on account of
  25  * linking the GUILE library code into it.
  26  *
  27  * This exception does not however invalidate any other reasons why
  28  * the executable file might be covered by the GNU General Public License.
  29  *
  30  * This exception applies only to the code released by the
  31  * Free Software Foundation under the name GUILE.  If you copy
  32  * code from other Free Software Foundation releases into a copy of
  33  * GUILE, as the General Public License permits, the exception does
  34  * not apply to the code that you add in this way.  To avoid misleading
  35  * anyone as to the status of such modified files, you must delete
  36  * this exception notice from them.
  37  *
  38  * If you write modifications of your own for GUILE, it is your choice
  39  * whether to permit this exception to apply to your modifications.
  40  * If you do not wish that, delete this exception notice.  */
  41
  42
  43 \f
  44
  45 #include <ctype.h>
  46 #include "libguile/_scm.h"
  47 #include "libguile/validate.h"
  48
  49 #include "libguile/chars.h"
  50 \f
  51
  52 SCM_DEFINE (scm_char_p, "char?", 1, 0, 0,
  53             (SCM x),
  54             "Return @code{#t} iff @var{x} is a character, else @code{#f}.")
  55 #define FUNC_NAME s_scm_char_p
  56 {
  57   return SCM_BOOL(SCM_CHARP(x));
  58 }
  59 #undef FUNC_NAME
  60
  61 SCM_DEFINE1 (scm_char_eq_p, "char=?", scm_tc7_rpsubr,
  62              (SCM x, SCM y),
  63              "Return @code{#t} iff @var{x} is the same character as @var{y}, else @code{#f}.")
  64 #define FUNC_NAME s_scm_char_eq_p
  65 {
  66   SCM_VALIDATE_CHAR (1, x);
  67   SCM_VALIDATE_CHAR (2, y);
  68   return SCM_BOOL (SCM_EQ_P (x, y));
  69 }
  70 #undef FUNC_NAME
  71
  72
  73 SCM_DEFINE1 (scm_char_less_p, "char<?", scm_tc7_rpsubr,
  74              (SCM x, SCM y),
  75              "Return @code{#t} iff @var{x} is less than @var{y} in the ASCII sequence,\n"
  76              "else @code{#f}.")
  77 #define FUNC_NAME s_scm_char_less_p
  78 {
  79   SCM_VALIDATE_CHAR (1, x);
  80   SCM_VALIDATE_CHAR (2, y);
  81   return SCM_BOOL(SCM_CHAR(x) < SCM_CHAR(y));
  82 }
  83 #undef FUNC_NAME
  84
  85 SCM_DEFINE1 (scm_char_leq_p, "char<=?", scm_tc7_rpsubr,
  86              (SCM x, SCM y),
  87              "Return @code{#t} iff @var{x} is less than or equal to @var{y} in the\n"
  88              "ASCII sequence, else @code{#f}.")
  89 #define FUNC_NAME s_scm_char_leq_p
  90 {
  91   SCM_VALIDATE_CHAR (1, x);
  92   SCM_VALIDATE_CHAR (2, y);
  93   return SCM_BOOL(SCM_CHAR(x) <= SCM_CHAR(y));
  94 }
  95 #undef FUNC_NAME
  96
  97 SCM_DEFINE1 (scm_char_gr_p, "char>?", scm_tc7_rpsubr,
  98              (SCM x, SCM y),
  99              "Return @code{#t} iff @var{x} is greater than @var{y} in the ASCII\n"
 100              "sequence, else @code{#f}.")
 101 #define FUNC_NAME s_scm_char_gr_p
 102 {
 103   SCM_VALIDATE_CHAR (1, x);
 104   SCM_VALIDATE_CHAR (2, y);
 105   return SCM_BOOL(SCM_CHAR(x) > SCM_CHAR(y));
 106 }
 107 #undef FUNC_NAME
 108
 109 SCM_DEFINE1 (scm_char_geq_p, "char>=?", scm_tc7_rpsubr,
 110              (SCM x, SCM y),
 111              "Return @code{#t} iff @var{x} is greater than or equal to @var{y} in the\n"
 112              "ASCII sequence, else @code{#f}.")
 113 #define FUNC_NAME s_scm_char_geq_p
 114 {
 115   SCM_VALIDATE_CHAR (1, x);
 116   SCM_VALIDATE_CHAR (2, y);
 117   return SCM_BOOL(SCM_CHAR(x) >= SCM_CHAR(y));
 118 }
 119 #undef FUNC_NAME
 120
 121 SCM_DEFINE1 (scm_char_ci_eq_p, "char-ci=?", scm_tc7_rpsubr,
 122              (SCM x, SCM y),
 123              "Return @code{#t} iff @var{x} is the same character as @var{y} ignoring\n"
 124              "case, else @code{#f}.")
 125 #define FUNC_NAME s_scm_char_ci_eq_p
 126 {
 127   SCM_VALIDATE_CHAR (1, x);
 128   SCM_VALIDATE_CHAR (2, y);
 129   return SCM_BOOL(scm_upcase(SCM_CHAR(x))==scm_upcase(SCM_CHAR(y)));
 130 }
 131 #undef FUNC_NAME
 132
 133 SCM_DEFINE1 (scm_char_ci_less_p, "char-ci<?", scm_tc7_rpsubr,
 134              (SCM x, SCM y),
 135              "Return @code{#t} iff @var{x} is less than @var{y} in the ASCII sequence\n"
 136              "ignoring case, else @code{#f}.")
 137 #define FUNC_NAME s_scm_char_ci_less_p
 138 {
 139   SCM_VALIDATE_CHAR (1, x);
 140   SCM_VALIDATE_CHAR (2, y);
 141   return SCM_BOOL((scm_upcase(SCM_CHAR(x))) < scm_upcase(SCM_CHAR(y)));
 142 }
 143 #undef FUNC_NAME
 144
 145 SCM_DEFINE1 (scm_char_ci_leq_p, "char-ci<=?", scm_tc7_rpsubr,
 146              (SCM x, SCM y),
 147              "Return @code{#t} iff @var{x} is less than or equal to @var{y} in the\n"
 148              "ASCII sequence ignoring case, else @code{#f}.")
 149 #define FUNC_NAME s_scm_char_ci_leq_p
 150 {
 151   SCM_VALIDATE_CHAR (1, x);
 152   SCM_VALIDATE_CHAR (2, y);
 153   return SCM_BOOL(scm_upcase(SCM_CHAR(x)) <= scm_upcase(SCM_CHAR(y)));
 154 }
 155 #undef FUNC_NAME
 156
 157 SCM_DEFINE1 (scm_char_ci_gr_p, "char-ci>?", scm_tc7_rpsubr,
 158              (SCM x, SCM y),
 159              "Return @code{#t} iff @var{x} is greater than @var{y} in the ASCII\n"
 160              "sequence ignoring case, else @code{#f}.")
 161 #define FUNC_NAME s_scm_char_ci_gr_p
 162 {
 163   SCM_VALIDATE_CHAR (1, x);
 164   SCM_VALIDATE_CHAR (2, y);
 165   return SCM_BOOL(scm_upcase(SCM_CHAR(x)) > scm_upcase(SCM_CHAR(y)));
 166 }
 167 #undef FUNC_NAME
 168
 169 SCM_DEFINE1 (scm_char_ci_geq_p, "char-ci>=?", scm_tc7_rpsubr,
 170              (SCM x, SCM y),
 171              "Return @code{#t} iff @var{x} is greater than or equal to @var{y} in the\n"
 172              "ASCII sequence ignoring case, else @code{#f}.")
 173 #define FUNC_NAME s_scm_char_ci_geq_p
 174 {
 175   SCM_VALIDATE_CHAR (1, x);
 176   SCM_VALIDATE_CHAR (2, y);
 177   return SCM_BOOL(scm_upcase(SCM_CHAR(x)) >= scm_upcase(SCM_CHAR(y)));
 178 }
 179 #undef FUNC_NAME
 180
 181
 182 SCM_DEFINE (scm_char_alphabetic_p, "char-alphabetic?", 1, 0, 0,
 183            (SCM chr),
 184             "Return @code{#t} iff @var{chr} is alphabetic, else @code{#f}.\n"
 185             "Alphabetic means the same thing as the isalpha C library function.")
 186 #define FUNC_NAME s_scm_char_alphabetic_p
 187 {
 188   SCM_VALIDATE_CHAR (1, chr);
 189   return SCM_BOOL(isalpha(SCM_CHAR(chr)));
 190 }
 191 #undef FUNC_NAME
 192
 193 SCM_DEFINE (scm_char_numeric_p, "char-numeric?", 1, 0, 0,
 194            (SCM chr),
 195             "Return @code{#t} iff @var{chr} is numeric, else @code{#f}.\n"
 196             "Numeric means the same thing as the isdigit C library function.")
 197 #define FUNC_NAME s_scm_char_numeric_p
 198 {
 199   SCM_VALIDATE_CHAR (1, chr);
 200   return SCM_BOOL(isdigit(SCM_CHAR(chr)));
 201 }
 202 #undef FUNC_NAME
 203
 204 SCM_DEFINE (scm_char_whitespace_p, "char-whitespace?", 1, 0, 0,
 205            (SCM chr),
 206             "Return @code{#t} iff @var{chr} is whitespace, else @code{#f}.\n"
 207             "Whitespace means the same thing as the isspace C library function.")
 208 #define FUNC_NAME s_scm_char_whitespace_p
 209 {
 210   SCM_VALIDATE_CHAR (1, chr);
 211   return SCM_BOOL(isspace(SCM_CHAR(chr)));
 212 }
 213 #undef FUNC_NAME
 214
 215
 216
 217 SCM_DEFINE (scm_char_upper_case_p, "char-upper-case?", 1, 0, 0,
 218            (SCM chr),
 219             "Return @code{#t} iff @var{chr} is uppercase, else @code{#f}.\n"
 220             "Uppercase means the same thing as the isupper C library function.")
 221 #define FUNC_NAME s_scm_char_upper_case_p
 222 {
 223   SCM_VALIDATE_CHAR (1, chr);
 224   return SCM_BOOL(isupper(SCM_CHAR(chr)));
 225 }
 226 #undef FUNC_NAME
 227
 228
 229 SCM_DEFINE (scm_char_lower_case_p, "char-lower-case?", 1, 0, 0,
 230            (SCM chr),
 231             "Return @code{#t} iff @var{chr} is lowercase, else @code{#f}.\n"
 232             "Lowercase means the same thing as the islower C library function.")
 233 #define FUNC_NAME s_scm_char_lower_case_p
 234 {
 235   SCM_VALIDATE_CHAR (1, chr);
 236   return SCM_BOOL(islower(SCM_CHAR(chr)));
 237 }
 238 #undef FUNC_NAME
 239
 240
 241
 242 SCM_DEFINE (scm_char_is_both_p, "char-is-both?", 1, 0, 0,
 243             (SCM chr),
 244             "Return @code{#t} iff @var{chr} is either uppercase or lowercase, else @code{#f}.\n"
 245             "Uppercase and lowercase are as defined by the isupper and islower\n"
 246             "C library functions.")
 247 #define FUNC_NAME s_scm_char_is_both_p
 248 {
 249   SCM_VALIDATE_CHAR (1, chr);
 250   return SCM_BOOL((isupper(SCM_CHAR(chr)) || islower(SCM_CHAR(chr))));
 251 }
 252 #undef FUNC_NAME
 253
 254
 255
 256
 257 SCM_DEFINE (scm_char_to_integer, "char->integer", 1, 0, 0,
 258             (SCM chr),
 259             "Return the number corresponding to ordinal position of @var{chr} in the\n"
 260             "ASCII sequence.")
 261 #define FUNC_NAME s_scm_char_to_integer
 262 {
 263   SCM_VALIDATE_CHAR (1, chr);
 264   return scm_ulong2num((unsigned long)SCM_CHAR(chr));
 265 }
 266 #undef FUNC_NAME
 267
 268
 269
 270 SCM_DEFINE (scm_integer_to_char, "integer->char", 1, 0, 0,
 271            (SCM n),
 272             "Return the character at position @var{n} in the ASCII sequence.")
 273 #define FUNC_NAME s_scm_integer_to_char
 274 {
 275   SCM_VALIDATE_INUM_RANGE (1, n, 0, 256);
 276   return SCM_MAKE_CHAR (SCM_INUM (n));
 277 }
 278 #undef FUNC_NAME
 279
 280
 281 SCM_DEFINE (scm_char_upcase, "char-upcase", 1, 0, 0,
 282            (SCM chr),
 283             "Return the uppercase character version of @var{chr}.")
 284 #define FUNC_NAME s_scm_char_upcase
 285 {
 286   SCM_VALIDATE_CHAR (1, chr);
 287   return SCM_MAKE_CHAR(scm_upcase(SCM_CHAR(chr)));
 288 }
 289 #undef FUNC_NAME
 290
 291
 292 SCM_DEFINE (scm_char_downcase, "char-downcase", 1, 0, 0,
 293            (SCM chr),
 294             "Return the lowercase character version of @var{chr}.")
 295 #define FUNC_NAME s_scm_char_downcase
 296 {
 297   SCM_VALIDATE_CHAR (1, chr);
 298   return SCM_MAKE_CHAR(scm_downcase(SCM_CHAR(chr)));
 299 }
 300 #undef FUNC_NAME
 301
 302 \f
 303
 304
 305
 306 static unsigned char scm_upcase_table[SCM_CHAR_CODE_LIMIT];
 307 static unsigned char scm_downcase_table[SCM_CHAR_CODE_LIMIT];
 308 static const unsigned char scm_lowers[] = "abcdefghijklmnopqrstuvwxyz";
 309 static const unsigned char scm_uppers[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 310
 311
 312 void
 313 scm_tables_prehistory ()
 314 {
 315   int i;
 316   for (i = 0; i < SCM_CHAR_CODE_LIMIT; i++)
 317     scm_upcase_table[i] = scm_downcase_table[i] = i;
 318   for (i = 0; i < (int) (sizeof scm_lowers / sizeof (scm_lowers[0])); i++)
 319     {
 320       scm_upcase_table[scm_lowers[i]] = scm_uppers[i];
 321       scm_downcase_table[scm_uppers[i]] = scm_lowers[i];
 322     }
 323 }
 324
 325
 326 int
 327 scm_upcase (unsigned int c)
 328 {
 329   if (c < sizeof (scm_upcase_table))
 330     return scm_upcase_table[c];
 331   else
 332     return c;
 333 }
 334
 335
 336 int
 337 scm_downcase (unsigned int c)
 338 {
 339   if (c < sizeof (scm_downcase_table))
 340     return scm_downcase_table[c];
 341   else
 342     return c;
 343 }
 344
 345
 346 #ifdef _DCC
 347 # define ASCII
 348 #else
 349 # if (('\n'=='\025') && (' '=='\100') && ('a'=='\201') && ('A'=='\301'))
 350 #  define EBCDIC
 351 # endif /*  (('\n'=='\025') && (' '=='\100') && ('a'=='\201') && ('A'=='\301')) */
 352 # if (('\n'=='\012') && (' '=='\040') && ('a'=='\141') && ('A'=='\101'))
 353 #  define ASCII
 354 # endif /*  (('\n'=='\012') && (' '=='\040') && ('a'=='\141') && ('A'=='\101')) */
 355 #endif /* def _DCC */
 356
 357
 358 #ifdef EBCDIC
 359 char *const scm_charnames[] =
 360 {
 361   "nul", "soh", "stx", "etx", "pf", "ht", "lc", "del",
 362    0   , 0   , "smm", "vt", "ff", "cr", "so", "si",
 363   "dle", "dc1", "dc2", "dc3", "res", "nl", "bs", "il",
 364   "can", "em", "cc", 0   , "ifs", "igs", "irs", "ius",
 365    "ds", "sos", "fs", 0   , "byp", "lf", "eob", "pre",
 366    0   , 0   , "sm", 0   , 0   , "enq", "ack", "bel",
 367    0   , 0   , "syn", 0   , "pn", "rs", "uc", "eot",
 368    0   , 0   , 0   , 0   , "dc4", "nak", 0   , "sub",
 369    "space", scm_s_newline, "tab", "backspace", "return", "page", "null"};
 370
 371 const char scm_charnums[] =
 372 "\000\001\002\003\004\005\006\007\
 373 \010\011\012\013\014\015\016\017\
 374 \020\021\022\023\024\025\026\027\
 375 \030\031\032\033\034\035\036\037\
 376 \040\041\042\043\044\045\046\047\
 377 \050\051\052\053\054\055\056\057\
 378 \060\061\062\063\064\065\066\067\
 379 \070\071\072\073\074\075\076\077\
 380  \n\t\b\r\f\0";
 381 #endif /* def EBCDIC */
 382 #ifdef ASCII
 383 char *const scm_charnames[] =
 384 {
 385   "nul","soh","stx","etx","eot","enq","ack","bel",
 386    "bs", "ht", "newline", "vt", "np", "cr", "so", "si",
 387   "dle","dc1","dc2","dc3","dc4","nak","syn","etb",
 388   "can", "em","sub","esc", "fs", "gs", "rs", "us",
 389   "space", "nl", "tab", "backspace", "return", "page", "null", "del"};
 390 const char scm_charnums[] =
 391 "\000\001\002\003\004\005\006\007\
 392 \010\011\012\013\014\015\016\017\
 393 \020\021\022\023\024\025\026\027\
 394 \030\031\032\033\034\035\036\037\
 395  \n\t\b\r\f\0\177";
 396 #endif /* def ASCII */
 397
 398 int scm_n_charnames = sizeof (scm_charnames) / sizeof (char *);
 399
 400
 401 \f
 402
 403
 404 void
 405 scm_init_chars ()
 406 {
 407 #include "libguile/chars.x"
 408 }
 409
 410
 411 /*
 412   Local Variables:
 413   c-file-style: "gnu"
 414   End:
 415 */