libguile/chars.c

   1 /*      Copyright (C) 1995,1996,1998, 2000, 2001 Free Software Foundation, Inc.
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library 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 GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  16  */
  17
  18
  19 \f
  20
  21 #include <ctype.h>
  22 #include "libguile/_scm.h"
  23 #include "libguile/validate.h"
  24
  25 #include "libguile/chars.h"
  26 \f
  27
  28 SCM_DEFINE (scm_char_p, "char?", 1, 0, 0,
  29             (SCM x),
  30             "Return @code{#t} iff @var{x} is a character, else @code{#f}.")
  31 #define FUNC_NAME s_scm_char_p
  32 {
  33   return SCM_BOOL(SCM_CHARP(x));
  34 }
  35 #undef FUNC_NAME
  36
  37 SCM_DEFINE1 (scm_char_eq_p, "char=?", scm_tc7_rpsubr,
  38              (SCM x, SCM y),
  39              "Return @code{#t} iff @var{x} is the same character as @var{y}, else @code{#f}.")
  40 #define FUNC_NAME s_scm_char_eq_p
  41 {
  42   SCM_VALIDATE_CHAR (1, x);
  43   SCM_VALIDATE_CHAR (2, y);
  44   return SCM_BOOL (SCM_EQ_P (x, y));
  45 }
  46 #undef FUNC_NAME
  47
  48
  49 SCM_DEFINE1 (scm_char_less_p, "char<?", scm_tc7_rpsubr,
  50              (SCM x, SCM y),
  51              "Return @code{#t} iff @var{x} is less than @var{y} in the ASCII sequence,\n"
  52              "else @code{#f}.")
  53 #define FUNC_NAME s_scm_char_less_p
  54 {
  55   SCM_VALIDATE_CHAR (1, x);
  56   SCM_VALIDATE_CHAR (2, y);
  57   return SCM_BOOL(SCM_CHAR(x) < SCM_CHAR(y));
  58 }
  59 #undef FUNC_NAME
  60
  61 SCM_DEFINE1 (scm_char_leq_p, "char<=?", scm_tc7_rpsubr,
  62              (SCM x, SCM y),
  63              "Return @code{#t} iff @var{x} is less than or equal to @var{y} in the\n"
  64              "ASCII sequence, else @code{#f}.")
  65 #define FUNC_NAME s_scm_char_leq_p
  66 {
  67   SCM_VALIDATE_CHAR (1, x);
  68   SCM_VALIDATE_CHAR (2, y);
  69   return SCM_BOOL(SCM_CHAR(x) <= SCM_CHAR(y));
  70 }
  71 #undef FUNC_NAME
  72
  73 SCM_DEFINE1 (scm_char_gr_p, "char>?", scm_tc7_rpsubr,
  74              (SCM x, SCM y),
  75              "Return @code{#t} iff @var{x} is greater than @var{y} in the ASCII\n"
  76              "sequence, else @code{#f}.")
  77 #define FUNC_NAME s_scm_char_gr_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_geq_p, "char>=?", scm_tc7_rpsubr,
  86              (SCM x, SCM y),
  87              "Return @code{#t} iff @var{x} is greater than or equal to @var{y} in the\n"
  88              "ASCII sequence, else @code{#f}.")
  89 #define FUNC_NAME s_scm_char_geq_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_ci_eq_p, "char-ci=?", scm_tc7_rpsubr,
  98              (SCM x, SCM y),
  99              "Return @code{#t} iff @var{x} is the same character as @var{y} ignoring\n"
 100              "case, else @code{#f}.")
 101 #define FUNC_NAME s_scm_char_ci_eq_p
 102 {
 103   SCM_VALIDATE_CHAR (1, x);
 104   SCM_VALIDATE_CHAR (2, y);
 105   return SCM_BOOL(scm_upcase(SCM_CHAR(x))==scm_upcase(SCM_CHAR(y)));
 106 }
 107 #undef FUNC_NAME
 108
 109 SCM_DEFINE1 (scm_char_ci_less_p, "char-ci<?", scm_tc7_rpsubr,
 110              (SCM x, SCM y),
 111              "Return @code{#t} iff @var{x} is less than @var{y} in the ASCII sequence\n"
 112              "ignoring case, else @code{#f}.")
 113 #define FUNC_NAME s_scm_char_ci_less_p
 114 {
 115   SCM_VALIDATE_CHAR (1, x);
 116   SCM_VALIDATE_CHAR (2, y);
 117   return SCM_BOOL((scm_upcase(SCM_CHAR(x))) < scm_upcase(SCM_CHAR(y)));
 118 }
 119 #undef FUNC_NAME
 120
 121 SCM_DEFINE1 (scm_char_ci_leq_p, "char-ci<=?", scm_tc7_rpsubr,
 122              (SCM x, SCM y),
 123              "Return @code{#t} iff @var{x} is less than or equal to @var{y} in the\n"
 124              "ASCII sequence ignoring case, else @code{#f}.")
 125 #define FUNC_NAME s_scm_char_ci_leq_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_gr_p, "char-ci>?", scm_tc7_rpsubr,
 134              (SCM x, SCM y),
 135              "Return @code{#t} iff @var{x} is greater than @var{y} in the ASCII\n"
 136              "sequence ignoring case, else @code{#f}.")
 137 #define FUNC_NAME s_scm_char_ci_gr_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_geq_p, "char-ci>=?", scm_tc7_rpsubr,
 146              (SCM x, SCM y),
 147              "Return @code{#t} iff @var{x} is greater 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_geq_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
 158 SCM_DEFINE (scm_char_alphabetic_p, "char-alphabetic?", 1, 0, 0,
 159            (SCM chr),
 160             "Return @code{#t} iff @var{chr} is alphabetic, else @code{#f}.\n"
 161             "Alphabetic means the same thing as the isalpha C library function.")
 162 #define FUNC_NAME s_scm_char_alphabetic_p
 163 {
 164   SCM_VALIDATE_CHAR (1, chr);
 165   return SCM_BOOL(isalpha(SCM_CHAR(chr)));
 166 }
 167 #undef FUNC_NAME
 168
 169 SCM_DEFINE (scm_char_numeric_p, "char-numeric?", 1, 0, 0,
 170            (SCM chr),
 171             "Return @code{#t} iff @var{chr} is numeric, else @code{#f}.\n"
 172             "Numeric means the same thing as the isdigit C library function.")
 173 #define FUNC_NAME s_scm_char_numeric_p
 174 {
 175   SCM_VALIDATE_CHAR (1, chr);
 176   return SCM_BOOL(isdigit(SCM_CHAR(chr)));
 177 }
 178 #undef FUNC_NAME
 179
 180 SCM_DEFINE (scm_char_whitespace_p, "char-whitespace?", 1, 0, 0,
 181            (SCM chr),
 182             "Return @code{#t} iff @var{chr} is whitespace, else @code{#f}.\n"
 183             "Whitespace means the same thing as the isspace C library function.")
 184 #define FUNC_NAME s_scm_char_whitespace_p
 185 {
 186   SCM_VALIDATE_CHAR (1, chr);
 187   return SCM_BOOL(isspace(SCM_CHAR(chr)));
 188 }
 189 #undef FUNC_NAME
 190
 191
 192
 193 SCM_DEFINE (scm_char_upper_case_p, "char-upper-case?", 1, 0, 0,
 194            (SCM chr),
 195             "Return @code{#t} iff @var{chr} is uppercase, else @code{#f}.\n"
 196             "Uppercase means the same thing as the isupper C library function.")
 197 #define FUNC_NAME s_scm_char_upper_case_p
 198 {
 199   SCM_VALIDATE_CHAR (1, chr);
 200   return SCM_BOOL(isupper(SCM_CHAR(chr)));
 201 }
 202 #undef FUNC_NAME
 203
 204
 205 SCM_DEFINE (scm_char_lower_case_p, "char-lower-case?", 1, 0, 0,
 206            (SCM chr),
 207             "Return @code{#t} iff @var{chr} is lowercase, else @code{#f}.\n"
 208             "Lowercase means the same thing as the islower C library function.")
 209 #define FUNC_NAME s_scm_char_lower_case_p
 210 {
 211   SCM_VALIDATE_CHAR (1, chr);
 212   return SCM_BOOL(islower(SCM_CHAR(chr)));
 213 }
 214 #undef FUNC_NAME
 215
 216
 217
 218 SCM_DEFINE (scm_char_is_both_p, "char-is-both?", 1, 0, 0,
 219             (SCM chr),
 220             "Return @code{#t} iff @var{chr} is either uppercase or lowercase, else @code{#f}.\n"
 221             "Uppercase and lowercase are as defined by the isupper and islower\n"
 222             "C library functions.")
 223 #define FUNC_NAME s_scm_char_is_both_p
 224 {
 225   SCM_VALIDATE_CHAR (1, chr);
 226   return SCM_BOOL((isupper(SCM_CHAR(chr)) || islower(SCM_CHAR(chr))));
 227 }
 228 #undef FUNC_NAME
 229
 230
 231
 232
 233 SCM_DEFINE (scm_char_to_integer, "char->integer", 1, 0, 0,
 234             (SCM chr),
 235             "Return the number corresponding to ordinal position of @var{chr} in the\n"
 236             "ASCII sequence.")
 237 #define FUNC_NAME s_scm_char_to_integer
 238 {
 239   SCM_VALIDATE_CHAR (1, chr);
 240   return scm_ulong2num((unsigned long)SCM_CHAR(chr));
 241 }
 242 #undef FUNC_NAME
 243
 244
 245
 246 SCM_DEFINE (scm_integer_to_char, "integer->char", 1, 0, 0,
 247            (SCM n),
 248             "Return the character at position @var{n} in the ASCII sequence.")
 249 #define FUNC_NAME s_scm_integer_to_char
 250 {
 251   SCM_VALIDATE_INUM_RANGE (1, n, 0, 256);
 252   return SCM_MAKE_CHAR (SCM_INUM (n));
 253 }
 254 #undef FUNC_NAME
 255
 256
 257 SCM_DEFINE (scm_char_upcase, "char-upcase", 1, 0, 0,
 258            (SCM chr),
 259             "Return the uppercase character version of @var{chr}.")
 260 #define FUNC_NAME s_scm_char_upcase
 261 {
 262   SCM_VALIDATE_CHAR (1, chr);
 263   return SCM_MAKE_CHAR(scm_upcase(SCM_CHAR(chr)));
 264 }
 265 #undef FUNC_NAME
 266
 267
 268 SCM_DEFINE (scm_char_downcase, "char-downcase", 1, 0, 0,
 269            (SCM chr),
 270             "Return the lowercase character version of @var{chr}.")
 271 #define FUNC_NAME s_scm_char_downcase
 272 {
 273   SCM_VALIDATE_CHAR (1, chr);
 274   return SCM_MAKE_CHAR(scm_downcase(SCM_CHAR(chr)));
 275 }
 276 #undef FUNC_NAME
 277
 278 \f
 279
 280
 281
 282 static unsigned char scm_upcase_table[SCM_CHAR_CODE_LIMIT];
 283 static unsigned char scm_downcase_table[SCM_CHAR_CODE_LIMIT];
 284 static const unsigned char scm_lowers[] = "abcdefghijklmnopqrstuvwxyz";
 285 static const unsigned char scm_uppers[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 286
 287
 288 void
 289 scm_tables_prehistory ()
 290 {
 291   int i;
 292   for (i = 0; i < SCM_CHAR_CODE_LIMIT; i++)
 293     scm_upcase_table[i] = scm_downcase_table[i] = i;
 294   for (i = 0; i < (int) (sizeof scm_lowers / sizeof (scm_lowers[0])); i++)
 295     {
 296       scm_upcase_table[scm_lowers[i]] = scm_uppers[i];
 297       scm_downcase_table[scm_uppers[i]] = scm_lowers[i];
 298     }
 299 }
 300
 301
 302 int
 303 scm_upcase (unsigned int c)
 304 {
 305   if (c < sizeof (scm_upcase_table))
 306     return scm_upcase_table[c];
 307   else
 308     return c;
 309 }
 310
 311
 312 int
 313 scm_downcase (unsigned int c)
 314 {
 315   if (c < sizeof (scm_downcase_table))
 316     return scm_downcase_table[c];
 317   else
 318     return c;
 319 }
 320
 321
 322 #ifdef _DCC
 323 # define ASCII
 324 #else
 325 # if (('\n'=='\025') && (' '=='\100') && ('a'=='\201') && ('A'=='\301'))
 326 #  define EBCDIC
 327 # endif /*  (('\n'=='\025') && (' '=='\100') && ('a'=='\201') && ('A'=='\301')) */
 328 # if (('\n'=='\012') && (' '=='\040') && ('a'=='\141') && ('A'=='\101'))
 329 #  define ASCII
 330 # endif /*  (('\n'=='\012') && (' '=='\040') && ('a'=='\141') && ('A'=='\101')) */
 331 #endif /* def _DCC */
 332
 333
 334 #ifdef EBCDIC
 335 char *const scm_charnames[] =
 336 {
 337   "nul", "soh", "stx", "etx", "pf", "ht", "lc", "del",
 338    0   , 0   , "smm", "vt", "ff", "cr", "so", "si",
 339   "dle", "dc1", "dc2", "dc3", "res", "nl", "bs", "il",
 340   "can", "em", "cc", 0   , "ifs", "igs", "irs", "ius",
 341    "ds", "sos", "fs", 0   , "byp", "lf", "eob", "pre",
 342    0   , 0   , "sm", 0   , 0   , "enq", "ack", "bel",
 343    0   , 0   , "syn", 0   , "pn", "rs", "uc", "eot",
 344    0   , 0   , 0   , 0   , "dc4", "nak", 0   , "sub",
 345    "space", scm_s_newline, "tab", "backspace", "return", "page", "null"};
 346
 347 const char scm_charnums[] =
 348 "\000\001\002\003\004\005\006\007\
 349 \010\011\012\013\014\015\016\017\
 350 \020\021\022\023\024\025\026\027\
 351 \030\031\032\033\034\035\036\037\
 352 \040\041\042\043\044\045\046\047\
 353 \050\051\052\053\054\055\056\057\
 354 \060\061\062\063\064\065\066\067\
 355 \070\071\072\073\074\075\076\077\
 356  \n\t\b\r\f\0";
 357 #endif /* def EBCDIC */
 358 #ifdef ASCII
 359 char *const scm_charnames[] =
 360 {
 361   "nul","soh","stx","etx","eot","enq","ack","bel",
 362    "bs", "ht", "newline", "vt", "np", "cr", "so", "si",
 363   "dle","dc1","dc2","dc3","dc4","nak","syn","etb",
 364   "can", "em","sub","esc", "fs", "gs", "rs", "us",
 365   "space", "nl", "tab", "backspace", "return", "page", "null", "del"};
 366 const char scm_charnums[] =
 367 "\000\001\002\003\004\005\006\007\
 368 \010\011\012\013\014\015\016\017\
 369 \020\021\022\023\024\025\026\027\
 370 \030\031\032\033\034\035\036\037\
 371  \n\t\b\r\f\0\177";
 372 #endif /* def ASCII */
 373
 374 int scm_n_charnames = sizeof (scm_charnames) / sizeof (char *);
 375
 376
 377 \f
 378
 379
 380 void
 381 scm_init_chars ()
 382 {
 383 #include "libguile/chars.x"
 384 }
 385
 386
 387 /*
 388   Local Variables:
 389   c-file-style: "gnu"
 390   End:
 391 */