code.delx.au - gnu-emacs/blob - src/casefiddle.c

   1 /* GNU Emacs case conversion functions.
   2    Copyright (C) 1985, 1994 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 1, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 #include <config.h>
  22 #include "lisp.h"
  23 #include "buffer.h"
  24 #include "commands.h"
  25 #include "syntax.h"
  26
  27 enum case_action {CASE_UP, CASE_DOWN, CASE_CAPITALIZE, CASE_CAPITALIZE_UP};
  28 \f
  29 Lisp_Object
  30 casify_object (flag, obj)
  31      enum case_action flag;
  32      Lisp_Object obj;
  33 {
  34   register int i, c, len;
  35   register int inword = flag == CASE_DOWN;
  36
  37   while (1)
  38     {
  39       if (XTYPE (obj) == Lisp_Int)
  40         {
  41           c = XINT (obj);
  42           if (c >= 0 && c <= 0400)
  43             {
  44               if (inword)
  45                 XFASTINT (obj) = DOWNCASE (c);
  46               else if (!UPPERCASEP (c))
  47                 XFASTINT (obj) = UPCASE1 (c);
  48             }
  49           return obj;
  50         }
  51       if (XTYPE (obj) == Lisp_String)
  52         {
  53           obj = Fcopy_sequence (obj);
  54           len = XSTRING (obj)->size;
  55           for (i = 0; i < len; i++)
  56             {
  57               c = XSTRING (obj)->data[i];
  58               if (inword && flag != CASE_CAPITALIZE_UP)
  59                 c = DOWNCASE (c);
  60               else if (!UPPERCASEP (c)
  61                        && (!inword || flag != CASE_CAPITALIZE_UP))
  62                 c = UPCASE1 (c);
  63               XSTRING (obj)->data[i] = c;
  64               if ((int) flag >= (int) CASE_CAPITALIZE)
  65                 inword = SYNTAX (c) == Sword;
  66             }
  67           return obj;
  68         }
  69       obj = wrong_type_argument (Qchar_or_string_p, obj);
  70     }
  71 }
  72
  73 DEFUN ("upcase", Fupcase, Supcase, 1, 1, 0,
  74   "Convert argument to upper case and return that.\n\
  75 The argument may be a character or string.  The result has the same type.\n\
  76 The argument object is not altered--the value is a copy.\n\
  77 See also `capitalize', `downcase' and `upcase-initials'.")
  78   (obj)
  79      Lisp_Object obj;
  80 {
  81   return casify_object (CASE_UP, obj);
  82 }
  83
  84 DEFUN ("downcase", Fdowncase, Sdowncase, 1, 1, 0,
  85   "Convert argument to lower case and return that.\n\
  86 The argument may be a character or string.  The result has the same type.\n\
  87 The argument object is not altered--the value is a copy.")
  88   (obj)
  89      Lisp_Object obj;
  90 {
  91   return casify_object (CASE_DOWN, obj);
  92 }
  93
  94 DEFUN ("capitalize", Fcapitalize, Scapitalize, 1, 1, 0,
  95   "Convert argument to capitalized form and return that.\n\
  96 This means that each word's first character is upper case\n\
  97 and the rest is lower case.\n\
  98 The argument may be a character or string.  The result has the same type.\n\
  99 The argument object is not altered--the value is a copy.")
 100   (obj)
 101      Lisp_Object obj;
 102 {
 103   return casify_object (CASE_CAPITALIZE, obj);
 104 }
 105
 106 DEFUN ("upcase-initials", Fupcase_initials, Supcase_initials, 1, 1, 0,
 107   "Convert the initial of each word in the argument to upper case.\n\
 108 Do not change the other letters of each word.\n\
 109 The argument may be a character or string.  The result has the same type.\n\
 110 The argument object is not altered--the value is a copy.")
 111   (obj)
 112      Lisp_Object obj;
 113 {
 114   return casify_object (CASE_CAPITALIZE_UP, obj);
 115 }
 116
 117 /* Like Fcapitalize but change only the initials.  */
 118
 119 Lisp_Object
 120 upcase_initials (obj)
 121      Lisp_Object obj;
 122 {
 123   return casify_object (CASE_CAPITALIZE_UP, obj);
 124 }
 125 \f
 126 /* flag is CASE_UP, CASE_DOWN or CASE_CAPITALIZE or CASE_CAPITALIZE_UP.
 127    b and e specify range of buffer to operate on. */
 128
 129 casify_region (flag, b, e)
 130      enum case_action flag;
 131      Lisp_Object b, e;
 132 {
 133   register int i;
 134   register int c;
 135   register int inword = flag == CASE_DOWN;
 136
 137   if (EQ (b, e))
 138     /* Not modifying because nothing marked */
 139     return;
 140
 141   validate_region (&b, &e);
 142   modify_region (current_buffer, XFASTINT (b), XFASTINT (e));
 143   record_change (XFASTINT (b), XFASTINT (e) - XFASTINT (b));
 144
 145   for (i = XFASTINT (b); i < XFASTINT (e); i++)
 146     {
 147       c = FETCH_CHAR (i);
 148       if (inword && flag != CASE_CAPITALIZE_UP)
 149         c = DOWNCASE (c);
 150       else if (!UPPERCASEP (c)
 151                && (!inword || flag != CASE_CAPITALIZE_UP))
 152         c = UPCASE1 (c);
 153       FETCH_CHAR (i) = c;
 154       if ((int) flag >= (int) CASE_CAPITALIZE)
 155         inword = SYNTAX (c) == Sword;
 156     }
 157
 158   signal_after_change (XFASTINT (b),
 159                        XFASTINT (e) - XFASTINT (b),
 160                        XFASTINT (e) - XFASTINT (b));
 161 }
 162
 163 DEFUN ("upcase-region", Fupcase_region, Supcase_region, 2, 2, "r",
 164   "Convert the region to upper case.  In programs, wants two arguments.\n\
 165 These arguments specify the starting and ending character numbers of\n\
 166 the region to operate on.  When used as a command, the text between\n\
 167 point and the mark is operated on.\n\
 168 See also `capitalize-region'.")
 169   (b, e)
 170      Lisp_Object b, e;
 171 {
 172   casify_region (CASE_UP, b, e);
 173   return Qnil;
 174 }
 175
 176 DEFUN ("downcase-region", Fdowncase_region, Sdowncase_region, 2, 2, "r",
 177   "Convert the region to lower case.  In programs, wants two arguments.\n\
 178 These arguments specify the starting and ending character numbers of\n\
 179 the region to operate on.  When used as a command, the text between\n\
 180 point and the mark is operated on.")
 181   (b, e)
 182      Lisp_Object b, e;
 183 {
 184   casify_region (CASE_DOWN, b, e);
 185   return Qnil;
 186 }
 187
 188 DEFUN ("capitalize-region", Fcapitalize_region, Scapitalize_region, 2, 2, "r",
 189   "Convert the region to capitalized form.\n\
 190 Capitalized form means each word's first character is upper case\n\
 191 and the rest of it is lower case.\n\
 192 In programs, give two arguments, the starting and ending\n\
 193 character positions to operate on.")
 194   (b, e)
 195      Lisp_Object b, e;
 196 {
 197   casify_region (CASE_CAPITALIZE, b, e);
 198   return Qnil;
 199 }
 200
 201 DEFUN ("upcase-initials-region", Fupcase_initials_region,
 202        Supcase_initials_region, 2, 2, "r",
 203   "Upcase the initial of each word in the region.\n\
 204 Subsequent letters of each word are not changed.\n\
 205 In programs, give two arguments, the starting and ending\n\
 206 character positions to operate on.")
 207   (b, e)
 208      Lisp_Object b, e;
 209 {
 210   casify_region (CASE_CAPITALIZE_UP, b, e);
 211   return Qnil;
 212 }
 213
 214 /* Like Fcapitalize_region but change only the initials.  */
 215
 216 Lisp_Object
 217 upcase_initials_region (b, e)
 218      Lisp_Object b, e;
 219 {
 220   casify_region (CASE_CAPITALIZE_UP, b, e);
 221   return Qnil;
 222 }
 223 \f
 224 Lisp_Object
 225 operate_on_word (arg, newpoint)
 226      Lisp_Object arg;
 227      int *newpoint;
 228 {
 229   Lisp_Object val;
 230   int farend;
 231
 232   CHECK_NUMBER (arg, 0);
 233   farend = scan_words (point, XINT (arg));
 234   if (!farend)
 235     farend = XINT (arg) > 0 ? ZV : BEGV;
 236
 237   *newpoint = point > farend ? point : farend;
 238   XFASTINT (val) = farend;
 239
 240   return val;
 241 }
 242
 243 DEFUN ("upcase-word", Fupcase_word, Supcase_word, 1, 1, "p",
 244   "Convert following word (or ARG words) to upper case, moving over.\n\
 245 With negative argument, convert previous words but do not move.\n\
 246 See also `capitalize-word'.")
 247   (arg)
 248      Lisp_Object arg;
 249 {
 250   Lisp_Object beg, end;
 251   int newpoint;
 252   XFASTINT (beg) = point;
 253   end = operate_on_word (arg, &newpoint);
 254   casify_region (CASE_UP, beg, end);
 255   SET_PT (newpoint);
 256   return Qnil;
 257 }
 258
 259 DEFUN ("downcase-word", Fdowncase_word, Sdowncase_word, 1, 1, "p",
 260   "Convert following word (or ARG words) to lower case, moving over.\n\
 261 With negative argument, convert previous words but do not move.")
 262   (arg)
 263      Lisp_Object arg;
 264 {
 265   Lisp_Object beg, end;
 266   int newpoint;
 267   XFASTINT (beg) = point;
 268   end = operate_on_word (arg, &newpoint);
 269   casify_region (CASE_DOWN, beg, end);
 270   SET_PT (newpoint);
 271   return Qnil;
 272 }
 273
 274 DEFUN ("capitalize-word", Fcapitalize_word, Scapitalize_word, 1, 1, "p",
 275   "Capitalize the following word (or ARG words), moving over.\n\
 276 This gives the word(s) a first character in upper case\n\
 277 and the rest lower case.\n\
 278 With negative argument, capitalize previous words but do not move.")
 279   (arg)
 280      Lisp_Object arg;
 281 {
 282   Lisp_Object beg, end;
 283   int newpoint;
 284   XFASTINT (beg) = point;
 285   end = operate_on_word (arg, &newpoint);
 286   casify_region (CASE_CAPITALIZE, beg, end);
 287   SET_PT (newpoint);
 288   return Qnil;
 289 }
 290 \f
 291 syms_of_casefiddle ()
 292 {
 293   defsubr (&Supcase);
 294   defsubr (&Sdowncase);
 295   defsubr (&Scapitalize);
 296   defsubr (&Supcase_initials);
 297   defsubr (&Supcase_region);
 298   defsubr (&Sdowncase_region);
 299   defsubr (&Scapitalize_region);
 300   defsubr (&Supcase_initials_region);
 301   defsubr (&Supcase_word);
 302   defsubr (&Sdowncase_word);
 303   defsubr (&Scapitalize_word);
 304 }
 305
 306 keys_of_casefiddle ()
 307 {
 308   initial_define_key (control_x_map, Ctl('U'), "upcase-region");
 309   Fput (intern ("upcase-region"), Qdisabled, Qt);
 310   initial_define_key (control_x_map, Ctl('L'), "downcase-region");
 311   Fput (intern ("downcase-region"), Qdisabled, Qt);
 312
 313   initial_define_key (meta_map, 'u', "upcase-word");
 314   initial_define_key (meta_map, 'l', "downcase-word");
 315   initial_define_key (meta_map, 'c', "capitalize-word");
 316 }