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 2, 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, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 #include <config.h>
  23 #include "lisp.h"
  24 #include "buffer.h"
  25 #include "commands.h"
  26 #include "syntax.h"
  27
  28 enum case_action {CASE_UP, CASE_DOWN, CASE_CAPITALIZE, CASE_CAPITALIZE_UP};
  29 \f
  30 Lisp_Object
  31 casify_object (flag, obj)
  32      enum case_action flag;
  33      Lisp_Object obj;
  34 {
  35   register int i, c, len;
  36   register int inword = flag == CASE_DOWN;
  37
  38   /* If the case table is flagged as modified, rescan it.  */
  39   if (NILP (XCHAR_TABLE (current_buffer->downcase_table)->extras[1]))
  40     Fset_case_table (current_buffer->downcase_table);
  41
  42   while (1)
  43     {
  44       if (INTEGERP (obj))
  45         {
  46           c = XINT (obj);
  47           if (c >= 0 && c <= 0400)
  48             {
  49               if (inword)
  50                 XSETFASTINT (obj, DOWNCASE (c));
  51               else if (!UPPERCASEP (c))
  52                 XSETFASTINT (obj, UPCASE1 (c));
  53             }
  54           return obj;
  55         }
  56       if (STRINGP (obj))
  57         {
  58           obj = Fcopy_sequence (obj);
  59           len = XSTRING (obj)->size;
  60           for (i = 0; i < len; i++)
  61             {
  62               c = XSTRING (obj)->data[i];
  63               if (inword && flag != CASE_CAPITALIZE_UP)
  64                 c = DOWNCASE (c);
  65               else if (!UPPERCASEP (c)
  66                        && (!inword || flag != CASE_CAPITALIZE_UP))
  67                 c = UPCASE1 (c);
  68               XSTRING (obj)->data[i] = c;
  69               if ((int) flag >= (int) CASE_CAPITALIZE)
  70                 inword = SYNTAX (c) == Sword;
  71             }
  72           return obj;
  73         }
  74       obj = wrong_type_argument (Qchar_or_string_p, obj);
  75     }
  76 }
  77
  78 DEFUN ("upcase", Fupcase, Supcase, 1, 1, 0,
  79   "Convert argument to upper case and return that.\n\
  80 The argument may be a character or string.  The result has the same type.\n\
  81 The argument object is not altered--the value is a copy.\n\
  82 See also `capitalize', `downcase' and `upcase-initials'.")
  83   (obj)
  84      Lisp_Object obj;
  85 {
  86   return casify_object (CASE_UP, obj);
  87 }
  88
  89 DEFUN ("downcase", Fdowncase, Sdowncase, 1, 1, 0,
  90   "Convert argument to lower case and return that.\n\
  91 The argument may be a character or string.  The result has the same type.\n\
  92 The argument object is not altered--the value is a copy.")
  93   (obj)
  94      Lisp_Object obj;
  95 {
  96   return casify_object (CASE_DOWN, obj);
  97 }
  98
  99 DEFUN ("capitalize", Fcapitalize, Scapitalize, 1, 1, 0,
 100   "Convert argument to capitalized form and return that.\n\
 101 This means that each word's first character is upper case\n\
 102 and the rest is lower case.\n\
 103 The argument may be a character or string.  The result has the same type.\n\
 104 The argument object is not altered--the value is a copy.")
 105   (obj)
 106      Lisp_Object obj;
 107 {
 108   return casify_object (CASE_CAPITALIZE, obj);
 109 }
 110
 111 /* Like Fcapitalize but change only the initials.  */
 112
 113 DEFUN ("upcase-initials", Fupcase_initials, Supcase_initials, 1, 1, 0,
 114   "Convert the initial of each word in the argument to upper case.\n\
 115 Do not change the other letters of each word.\n\
 116 The argument may be a character or string.  The result has the same type.\n\
 117 The argument object is not altered--the value is a copy.")
 118   (obj)
 119      Lisp_Object obj;
 120 {
 121   return casify_object (CASE_CAPITALIZE_UP, obj);
 122 }
 123 \f
 124 /* flag is CASE_UP, CASE_DOWN or CASE_CAPITALIZE or CASE_CAPITALIZE_UP.
 125    b and e specify range of buffer to operate on. */
 126
 127 casify_region (flag, b, e)
 128      enum case_action flag;
 129      Lisp_Object b, e;
 130 {
 131   register int i;
 132   register int c;
 133   register int inword = flag == CASE_DOWN;
 134   int start, end;
 135
 136   if (EQ (b, e))
 137     /* Not modifying because nothing marked */
 138     return;
 139
 140   /* If the case table is flagged as modified, rescan it.  */
 141   if (NILP (XCHAR_TABLE (current_buffer->downcase_table)->extras[1]))
 142     Fset_case_table (current_buffer->downcase_table);
 143
 144   validate_region (&b, &e);
 145   start = XFASTINT (b);
 146   end = XFASTINT (e);
 147   modify_region (current_buffer, start, end);
 148   record_change (start, end - start);
 149
 150   for (i = start; i < end; i++)
 151     {
 152       c = FETCH_CHAR (i);
 153       if (inword && flag != CASE_CAPITALIZE_UP)
 154         c = DOWNCASE (c);
 155       else if (!UPPERCASEP (c)
 156                && (!inword || flag != CASE_CAPITALIZE_UP))
 157         c = UPCASE1 (c);
 158       FETCH_CHAR (i) = c;
 159       if ((int) flag >= (int) CASE_CAPITALIZE)
 160         inword = SYNTAX (c) == Sword;
 161     }
 162
 163   signal_after_change (start, end - start, end - start);
 164 }
 165
 166 DEFUN ("upcase-region", Fupcase_region, Supcase_region, 2, 2, "r",
 167   "Convert the region to upper case.  In programs, wants two arguments.\n\
 168 These arguments specify the starting and ending character numbers of\n\
 169 the region to operate on.  When used as a command, the text between\n\
 170 point and the mark is operated on.\n\
 171 See also `capitalize-region'.")
 172   (beg, end)
 173      Lisp_Object beg, end;
 174 {
 175   casify_region (CASE_UP, beg, end);
 176   return Qnil;
 177 }
 178
 179 DEFUN ("downcase-region", Fdowncase_region, Sdowncase_region, 2, 2, "r",
 180   "Convert the region to lower case.  In programs, wants two arguments.\n\
 181 These arguments specify the starting and ending character numbers of\n\
 182 the region to operate on.  When used as a command, the text between\n\
 183 point and the mark is operated on.")
 184   (beg, end)
 185      Lisp_Object beg, end;
 186 {
 187   casify_region (CASE_DOWN, beg, end);
 188   return Qnil;
 189 }
 190
 191 DEFUN ("capitalize-region", Fcapitalize_region, Scapitalize_region, 2, 2, "r",
 192   "Convert the region to capitalized form.\n\
 193 Capitalized form means each word's first character is upper case\n\
 194 and the rest of it is lower case.\n\
 195 In programs, give two arguments, the starting and ending\n\
 196 character positions to operate on.")
 197   (beg, end)
 198      Lisp_Object beg, end;
 199 {
 200   casify_region (CASE_CAPITALIZE, beg, end);
 201   return Qnil;
 202 }
 203
 204 /* Like Fcapitalize_region but change only the initials.  */
 205
 206 DEFUN ("upcase-initials-region", Fupcase_initials_region,
 207        Supcase_initials_region, 2, 2, "r",
 208   "Upcase the initial of each word in the region.\n\
 209 Subsequent letters of each word are not changed.\n\
 210 In programs, give two arguments, the starting and ending\n\
 211 character positions to operate on.")
 212   (beg, end)
 213      Lisp_Object beg, end;
 214 {
 215   casify_region (CASE_CAPITALIZE_UP, beg, end);
 216   return Qnil;
 217 }
 218 \f
 219 Lisp_Object
 220 operate_on_word (arg, newpoint)
 221      Lisp_Object arg;
 222      int *newpoint;
 223 {
 224   Lisp_Object val;
 225   int farend;
 226   int iarg;
 227
 228   CHECK_NUMBER (arg, 0);
 229   iarg = XINT (arg);
 230   farend = scan_words (point, iarg);
 231   if (!farend)
 232     farend = iarg > 0 ? ZV : BEGV;
 233
 234   *newpoint = point > farend ? point : farend;
 235   XSETFASTINT (val, farend);
 236
 237   return val;
 238 }
 239
 240 DEFUN ("upcase-word", Fupcase_word, Supcase_word, 1, 1, "p",
 241   "Convert following word (or ARG words) to upper case, moving over.\n\
 242 With negative argument, convert previous words but do not move.\n\
 243 See also `capitalize-word'.")
 244   (arg)
 245      Lisp_Object arg;
 246 {
 247   Lisp_Object beg, end;
 248   int newpoint;
 249   XSETFASTINT (beg, point);
 250   end = operate_on_word (arg, &newpoint);
 251   casify_region (CASE_UP, beg, end);
 252   SET_PT (newpoint);
 253   return Qnil;
 254 }
 255
 256 DEFUN ("downcase-word", Fdowncase_word, Sdowncase_word, 1, 1, "p",
 257   "Convert following word (or ARG words) to lower case, moving over.\n\
 258 With negative argument, convert previous words but do not move.")
 259   (arg)
 260      Lisp_Object arg;
 261 {
 262   Lisp_Object beg, end;
 263   int newpoint;
 264   XSETFASTINT (beg, point);
 265   end = operate_on_word (arg, &newpoint);
 266   casify_region (CASE_DOWN, beg, end);
 267   SET_PT (newpoint);
 268   return Qnil;
 269 }
 270
 271 DEFUN ("capitalize-word", Fcapitalize_word, Scapitalize_word, 1, 1, "p",
 272   "Capitalize the following word (or ARG words), moving over.\n\
 273 This gives the word(s) a first character in upper case\n\
 274 and the rest lower case.\n\
 275 With negative argument, capitalize previous words but do not move.")
 276   (arg)
 277      Lisp_Object arg;
 278 {
 279   Lisp_Object beg, end;
 280   int newpoint;
 281   XSETFASTINT (beg, point);
 282   end = operate_on_word (arg, &newpoint);
 283   casify_region (CASE_CAPITALIZE, beg, end);
 284   SET_PT (newpoint);
 285   return Qnil;
 286 }
 287 \f
 288 syms_of_casefiddle ()
 289 {
 290   defsubr (&Supcase);
 291   defsubr (&Sdowncase);
 292   defsubr (&Scapitalize);
 293   defsubr (&Supcase_initials);
 294   defsubr (&Supcase_region);
 295   defsubr (&Sdowncase_region);
 296   defsubr (&Scapitalize_region);
 297   defsubr (&Supcase_initials_region);
 298   defsubr (&Supcase_word);
 299   defsubr (&Sdowncase_word);
 300   defsubr (&Scapitalize_word);
 301 }
 302
 303 keys_of_casefiddle ()
 304 {
 305   initial_define_key (control_x_map, Ctl('U'), "upcase-region");
 306   Fput (intern ("upcase-region"), Qdisabled, Qt);
 307   initial_define_key (control_x_map, Ctl('L'), "downcase-region");
 308   Fput (intern ("downcase-region"), Qdisabled, Qt);
 309
 310   initial_define_key (meta_map, 'u', "upcase-word");
 311   initial_define_key (meta_map, 'l', "downcase-word");
 312   initial_define_key (meta_map, 'c', "capitalize-word");
 313 }