libguile/chars.c

   1 /*      Copyright (C) 1995,1996,1998, 2000 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.
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  25  * linking the GUILE library code into it.
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  29  *
  30  * This exception applies only to the code released by the
  31  * Free Software Foundation under the name GUILE.  If you copy
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  36  * this exception notice from them.
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  39  * whether to permit this exception to apply to your modifications.
  40  * If you do not wish that, delete this exception notice.  */
  41
  42 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
  43    gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
  44
  45 \f
  46
  47 #include <ctype.h>
  48 #include "libguile/_scm.h"
  49 #include "libguile/validate.h"
  50
  51 #include "libguile/chars.h"
  52 \f
  53
  54 SCM_DEFINE (scm_char_p, "char?", 1, 0, 0,
  55             (SCM x),
  56             "Return @code{#t} iff @var{x} is a character, else @code{#f}.")
  57 #define FUNC_NAME s_scm_char_p
  58 {
  59   return SCM_BOOL(SCM_CHARP(x));
  60 }
  61 #undef FUNC_NAME
  62
  63 SCM_DEFINE1 (scm_char_eq_p, "char=?", scm_tc7_rpsubr,
  64              (SCM x, SCM y),
  65              "Return @code{#t} iff @var{x} is the same character as @var{y}, else @code{#f}.")
  66 #define FUNC_NAME s_scm_char_eq_p
  67 {
  68   SCM_VALIDATE_CHAR (1, x);
  69   SCM_VALIDATE_CHAR (2, y);
  70   return SCM_BOOL (SCM_EQ_P (x, y));
  71 }
  72 #undef FUNC_NAME
  73
  74
  75 SCM_DEFINE1 (scm_char_less_p, "char<?", scm_tc7_rpsubr,
  76              (SCM x, SCM y),
  77              "Return @code{#t} iff @var{x} is less than @var{y} in the ASCII sequence,\n"
  78              "else @code{#f}.")
  79 #define FUNC_NAME s_scm_char_less_p
  80 {
  81   SCM_VALIDATE_CHAR (1,x);
  82   SCM_VALIDATE_CHAR (2,y);
  83   return SCM_BOOL(SCM_CHAR(x) < SCM_CHAR(y));
  84 }
  85 #undef FUNC_NAME
  86
  87 SCM_DEFINE1 (scm_char_leq_p, "char<=?", scm_tc7_rpsubr,
  88              (SCM x, SCM y),
  89              "Return @code{#t} iff @var{x} is less than or equal to @var{y} in the\n"
  90              "ASCII sequence, else @code{#f}.")
  91 #define FUNC_NAME s_scm_char_leq_p
  92 {
  93   SCM_VALIDATE_CHAR (1,x);
  94   SCM_VALIDATE_CHAR (2,y);
  95   return SCM_BOOL(SCM_CHAR(x) <= SCM_CHAR(y));
  96 }
  97 #undef FUNC_NAME
  98
  99 SCM_DEFINE1 (scm_char_gr_p, "char>?", scm_tc7_rpsubr,
 100              (SCM x, SCM y),
 101              "Return @code{#t} iff @var{x} is greater than @var{y} in the ASCII\n"
 102              "sequence, else @code{#f}.")
 103 #define FUNC_NAME s_scm_char_gr_p
 104 {
 105   SCM_VALIDATE_CHAR (1,x);
 106   SCM_VALIDATE_CHAR (2,y);
 107   return SCM_BOOL(SCM_CHAR(x) > SCM_CHAR(y));
 108 }
 109 #undef FUNC_NAME
 110
 111 SCM_DEFINE1 (scm_char_geq_p, "char>=?", scm_tc7_rpsubr,
 112              (SCM x, SCM y),
 113              "Return @code{#t} iff @var{x} is greater than or equal to @var{y} in the\n"
 114              "ASCII sequence, else @code{#f}.")
 115 #define FUNC_NAME s_scm_char_geq_p
 116 {
 117   SCM_VALIDATE_CHAR (1,x);
 118   SCM_VALIDATE_CHAR (2,y);
 119   return SCM_BOOL(SCM_CHAR(x) >= SCM_CHAR(y));
 120 }
 121 #undef FUNC_NAME
 122
 123 SCM_DEFINE1 (scm_char_ci_eq_p, "char-ci=?", scm_tc7_rpsubr,
 124              (SCM x, SCM y),
 125              "Return @code{#t} iff @var{x} is the same character as @var{y} ignoring\n"
 126              "case, else @code{#f}.")
 127 #define FUNC_NAME s_scm_char_ci_eq_p
 128 {
 129   SCM_VALIDATE_CHAR (1,x);
 130   SCM_VALIDATE_CHAR (2,y);
 131   return SCM_BOOL(scm_upcase(SCM_CHAR(x))==scm_upcase(SCM_CHAR(y)));
 132 }
 133 #undef FUNC_NAME
 134
 135 SCM_DEFINE1 (scm_char_ci_less_p, "char-ci<?", scm_tc7_rpsubr,
 136              (SCM x, SCM y),
 137              "Return @code{#t} iff @var{x} is less than @var{y} in the ASCII sequence\n"
 138              "ignoring case, else @code{#f}.")
 139 #define FUNC_NAME s_scm_char_ci_less_p
 140 {
 141   SCM_VALIDATE_CHAR (1,x);
 142   SCM_VALIDATE_CHAR (2,y);
 143   return SCM_BOOL((scm_upcase(SCM_CHAR(x))) < scm_upcase(SCM_CHAR(y)));
 144 }
 145 #undef FUNC_NAME
 146
 147 SCM_DEFINE1 (scm_char_ci_leq_p, "char-ci<=?", scm_tc7_rpsubr,
 148              (SCM x, SCM y),
 149              "Return @code{#t} iff @var{x} is less than or equal to @var{y} in the\n"
 150              "ASCII sequence ignoring case, else @code{#f}.")
 151 #define FUNC_NAME s_scm_char_ci_leq_p
 152 {
 153   SCM_VALIDATE_CHAR (1,x);
 154   SCM_VALIDATE_CHAR (2,y);
 155   return SCM_BOOL(scm_upcase(SCM_CHAR(x)) <= scm_upcase(SCM_CHAR(y)));
 156 }
 157 #undef FUNC_NAME
 158
 159 SCM_DEFINE1 (scm_char_ci_gr_p, "char-ci>?", scm_tc7_rpsubr,
 160              (SCM x, SCM y),
 161              "Return @code{#t} iff @var{x} is greater than @var{y} in the ASCII\n"
 162              "sequence ignoring case, else @code{#f}.")
 163 #define FUNC_NAME s_scm_char_ci_gr_p
 164 {
 165   SCM_VALIDATE_CHAR (1,x);
 166   SCM_VALIDATE_CHAR (2,y);
 167   return SCM_BOOL(scm_upcase(SCM_CHAR(x)) > scm_upcase(SCM_CHAR(y)));
 168 }
 169 #undef FUNC_NAME
 170
 171 SCM_DEFINE1 (scm_char_ci_geq_p, "char-ci>=?", scm_tc7_rpsubr,
 172              (SCM x, SCM y),
 173              "Return @code{#t} iff @var{x} is greater than or equal to @var{y} in the\n"
 174              "ASCII sequence ignoring case, else @code{#f}.")
 175 #define FUNC_NAME s_scm_char_ci_geq_p
 176 {
 177   SCM_VALIDATE_CHAR (1,x);
 178   SCM_VALIDATE_CHAR (2,y);
 179   return SCM_BOOL(scm_upcase(SCM_CHAR(x)) >= scm_upcase(SCM_CHAR(y)));
 180 }
 181 #undef FUNC_NAME
 182
 183
 184 SCM_DEFINE (scm_char_alphabetic_p, "char-alphabetic?", 1, 0, 0,
 185            (SCM chr),
 186             "Return @code{#t} iff @var{chr} is alphabetic, else @code{#f}.\n"
 187             "Alphabetic means the same thing as the isalpha C library function.")
 188 #define FUNC_NAME s_scm_char_alphabetic_p
 189 {
 190   SCM_VALIDATE_CHAR (1,chr);
 191   return SCM_BOOL(isascii(SCM_CHAR(chr)) && isalpha(SCM_CHAR(chr)));
 192 }
 193 #undef FUNC_NAME
 194
 195 SCM_DEFINE (scm_char_numeric_p, "char-numeric?", 1, 0, 0,
 196            (SCM chr),
 197             "Return @code{#t} iff @var{chr} is numeric, else @code{#f}.\n"
 198             "Numeric means the same thing as the isdigit C library function.")
 199 #define FUNC_NAME s_scm_char_numeric_p
 200 {
 201   SCM_VALIDATE_CHAR (1,chr);
 202   return SCM_BOOL(isascii(SCM_CHAR(chr)) && isdigit(SCM_CHAR(chr)));
 203 }
 204 #undef FUNC_NAME
 205
 206 SCM_DEFINE (scm_char_whitespace_p, "char-whitespace?", 1, 0, 0,
 207            (SCM chr),
 208             "Return @code{#t} iff @var{chr} is whitespace, else @code{#f}.\n"
 209             "Whitespace means the same thing as the isspace C library function.")
 210 #define FUNC_NAME s_scm_char_whitespace_p
 211 {
 212   SCM_VALIDATE_CHAR (1,chr);
 213   return SCM_BOOL(isascii(SCM_CHAR(chr)) && isspace(SCM_CHAR(chr)));
 214 }
 215 #undef FUNC_NAME
 216
 217
 218
 219 SCM_DEFINE (scm_char_upper_case_p, "char-upper-case?", 1, 0, 0,
 220            (SCM chr),
 221             "Return @code{#t} iff @var{chr} is uppercase, else @code{#f}.\n"
 222             "Uppercase means the same thing as the isupper C library function.")
 223 #define FUNC_NAME s_scm_char_upper_case_p
 224 {
 225   SCM_VALIDATE_CHAR (1,chr);
 226   return SCM_BOOL(isascii(SCM_CHAR(chr)) && isupper(SCM_CHAR(chr)));
 227 }
 228 #undef FUNC_NAME
 229
 230
 231 SCM_DEFINE (scm_char_lower_case_p, "char-lower-case?", 1, 0, 0,
 232            (SCM chr),
 233             "Return @code{#t} iff @var{chr} is lowercase, else @code{#f}.\n"
 234             "Lowercase means the same thing as the islower C library function.")
 235 #define FUNC_NAME s_scm_char_lower_case_p
 236 {
 237   SCM_VALIDATE_CHAR (1,chr);
 238   return SCM_BOOL(isascii(SCM_CHAR(chr)) && islower(SCM_CHAR(chr)));
 239 }
 240 #undef FUNC_NAME
 241
 242
 243
 244 SCM_DEFINE (scm_char_is_both_p, "char-is-both?", 1, 0, 0,
 245             (SCM chr),
 246             "Return @code{#t} iff @var{chr} is either uppercase or lowercase, else @code{#f}.\n"
 247             "Uppercase and lowercase are as defined by the isupper and islower\n"
 248             "C library functions.")
 249 #define FUNC_NAME s_scm_char_is_both_p
 250 {
 251   SCM_VALIDATE_CHAR (1,chr);
 252   return SCM_BOOL(isascii(SCM_CHAR(chr)) && (isupper(SCM_CHAR(chr)) || islower(SCM_CHAR(chr))));
 253 }
 254 #undef FUNC_NAME
 255
 256
 257
 258
 259 SCM_DEFINE (scm_char_to_integer, "char->integer", 1, 0, 0,
 260             (SCM chr),
 261             "Return the number corresponding to ordinal position of @var{chr} in the\n"
 262             "ASCII sequence.")
 263 #define FUNC_NAME s_scm_char_to_integer
 264 {
 265   SCM_VALIDATE_CHAR (1,chr);
 266   return scm_ulong2num((unsigned long)SCM_CHAR(chr));
 267 }
 268 #undef FUNC_NAME
 269
 270
 271
 272 SCM_DEFINE (scm_integer_to_char, "integer->char", 1, 0, 0,
 273            (SCM n),
 274             "Return the character at position @var{n} in the ASCII sequence.")
 275 #define FUNC_NAME s_scm_integer_to_char
 276 {
 277   SCM_VALIDATE_INUM_RANGE (1, n, 0, 256);
 278   return SCM_MAKE_CHAR (SCM_INUM (n));
 279 }
 280 #undef FUNC_NAME
 281
 282
 283 SCM_DEFINE (scm_char_upcase, "char-upcase", 1, 0, 0,
 284            (SCM chr),
 285             "Return the uppercase character version of @var{chr}.")
 286 #define FUNC_NAME s_scm_char_upcase
 287 {
 288   SCM_VALIDATE_CHAR (1,chr);
 289   return SCM_MAKE_CHAR(scm_upcase(SCM_CHAR(chr)));
 290 }
 291 #undef FUNC_NAME
 292
 293
 294 SCM_DEFINE (scm_char_downcase, "char-downcase", 1, 0, 0,
 295            (SCM chr),
 296             "Return the lowercase character version of @var{chr}.")
 297 #define FUNC_NAME s_scm_char_downcase
 298 {
 299   SCM_VALIDATE_CHAR (1,chr);
 300   return SCM_MAKE_CHAR(scm_downcase(SCM_CHAR(chr)));
 301 }
 302 #undef FUNC_NAME
 303
 304 \f
 305
 306
 307
 308 static unsigned char scm_upcase_table[SCM_CHAR_CODE_LIMIT];
 309 static unsigned char scm_downcase_table[SCM_CHAR_CODE_LIMIT];
 310 static const unsigned char scm_lowers[] = "abcdefghijklmnopqrstuvwxyz";
 311 static const unsigned char scm_uppers[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 312
 313
 314 void
 315 scm_tables_prehistory ()
 316 {
 317   int i;
 318   for (i = 0; i < SCM_CHAR_CODE_LIMIT; i++)
 319     scm_upcase_table[i] = scm_downcase_table[i] = i;
 320   for (i = 0; i < (int) (sizeof scm_lowers / sizeof (scm_lowers[0])); i++)
 321     {
 322       scm_upcase_table[scm_lowers[i]] = scm_uppers[i];
 323       scm_downcase_table[scm_uppers[i]] = scm_lowers[i];
 324     }
 325 }
 326
 327
 328 int
 329 scm_upcase (unsigned int c)
 330 {
 331   if (c < sizeof (scm_upcase_table))
 332     return scm_upcase_table[c];
 333   else
 334     return c;
 335 }
 336
 337
 338 int
 339 scm_downcase (unsigned int c)
 340 {
 341   if (c < sizeof (scm_downcase_table))
 342     return scm_downcase_table[c];
 343   else
 344     return c;
 345 }
 346
 347
 348 #ifdef _DCC
 349 # define ASCII
 350 #else
 351 # if (('\n'=='\025') && (' '=='\100') && ('a'=='\201') && ('A'=='\301'))
 352 #  define EBCDIC
 353 # endif /*  (('\n'=='\025') && (' '=='\100') && ('a'=='\201') && ('A'=='\301')) */
 354 # if (('\n'=='\012') && (' '=='\040') && ('a'=='\141') && ('A'=='\101'))
 355 #  define ASCII
 356 # endif /*  (('\n'=='\012') && (' '=='\040') && ('a'=='\141') && ('A'=='\101')) */
 357 #endif /* def _DCC */
 358
 359
 360 #ifdef EBCDIC
 361 char *const scm_charnames[] =
 362 {
 363   "nul","soh","stx","etx", "pf", "ht", "lc","del",
 364    0   , 0   ,"smm", "vt", "ff", "cr", "so", "si",
 365   "dle","dc1","dc2","dc3","res", "nl", "bs", "il",
 366   "can", "em", "cc", 0   ,"ifs","igs","irs","ius",
 367    "ds","sos", "fs", 0   ,"byp", "lf","eob","pre",
 368    0   , 0   , "sm", 0   , 0   ,"enq","ack","bel",
 369    0   , 0   ,"syn", 0   , "pn", "rs", "uc","eot",
 370    0   , 0   , 0   , 0   ,"dc4","nak", 0   ,"sub",
 371    "space", scm_s_newline, "tab", "backspace", "return", "page", "null"};
 372
 373 const char scm_charnums[] =
 374 "\000\001\002\003\004\005\006\007\
 375 \010\011\012\013\014\015\016\017\
 376 \020\021\022\023\024\025\026\027\
 377 \030\031\032\033\034\035\036\037\
 378 \040\041\042\043\044\045\046\047\
 379 \050\051\052\053\054\055\056\057\
 380 \060\061\062\063\064\065\066\067\
 381 \070\071\072\073\074\075\076\077\
 382  \n\t\b\r\f\0";
 383 #endif /* def EBCDIC */
 384 #ifdef ASCII
 385 char *const scm_charnames[] =
 386 {
 387   "nul","soh","stx","etx","eot","enq","ack","bel",
 388    "bs", "ht", "newline", "vt", "np", "cr", "so", "si",
 389   "dle","dc1","dc2","dc3","dc4","nak","syn","etb",
 390   "can", "em","sub","esc", "fs", "gs", "rs", "us",
 391   "space", "nl", "tab", "backspace", "return", "page", "null", "del"};
 392 const char scm_charnums[] =
 393 "\000\001\002\003\004\005\006\007\
 394 \010\011\012\013\014\015\016\017\
 395 \020\021\022\023\024\025\026\027\
 396 \030\031\032\033\034\035\036\037\
 397  \n\t\b\r\f\0\177";
 398 #endif /* def ASCII */
 399
 400 int scm_n_charnames = sizeof (scm_charnames) / sizeof (char *);
 401
 402
 403 \f
 404
 405
 406 void
 407 scm_init_chars ()
 408 {
 409 #ifndef SCM_MAGIC_SNARFER
 410 #include "libguile/chars.x"
 411 #endif
 412 }
 413
 414
 415 /*
 416   Local Variables:
 417   c-file-style: "gnu"
 418   End:
 419 */