src/casefiddle.c

   1 /* GNU Emacs case conversion functions.
   2    Copyright (C) 1985 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)
  59                 c = DOWNCASE (c);
  60               else if (!UPPERCASEP (c))
  61                 c = UPCASE1 (c);
  62               XSTRING (obj)->data[i] = c;
  63               if (flag == CASE_CAPITALIZE)
  64                 inword = SYNTAX (c) == Sword;
  65             }
  66           return obj;
  67         }
  68       obj = wrong_type_argument (Qchar_or_string_p, obj);
  69     }
  70 }
  71
  72 DEFUN ("upcase", Fupcase, Supcase, 1, 1, 0,
  73   "Convert argument to upper case and return that.\n\
  74 The argument may be a character or string.  The result has the same type.\n\
  75 The argument object is not altered.  See also `capitalize'.")
  76   (obj)
  77      Lisp_Object obj;
  78 {
  79   return casify_object (CASE_UP, obj);
  80 }
  81
  82 DEFUN ("downcase", Fdowncase, Sdowncase, 1, 1, 0,
  83   "Convert argument to lower case and return that.\n\
  84 The argument may be a character or string.  The result has the same type.\n\
  85 The argument object is not altered.")
  86   (obj)
  87      Lisp_Object obj;
  88 {
  89   return casify_object (CASE_DOWN, obj);
  90 }
  91
  92 DEFUN ("capitalize", Fcapitalize, Scapitalize, 1, 1, 0,
  93   "Convert argument to capitalized form and return that.\n\
  94 This means that each word's first character is upper case\n\
  95 and the rest is lower case.\n\
  96 The argument may be a character or string.  The result has the same type.\n\
  97 The argument object is not altered.")
  98   (obj)
  99      Lisp_Object obj;
 100 {
 101   return casify_object (CASE_CAPITALIZE, obj);
 102 }
 103 \f
 104 /* flag is CASE_UP, CASE_DOWN or CASE_CAPITALIZE or CASE_CAPITALIZE_UP.
 105    b and e specify range of buffer to operate on. */
 106
 107 casify_region (flag, b, e)
 108      enum case_action flag;
 109      Lisp_Object b, e;
 110 {
 111   register int i;
 112   register int c;
 113   register int inword = flag == CASE_DOWN;
 114
 115   if (EQ (b, e))
 116     /* Not modifying because nothing marked */
 117     return;
 118
 119   validate_region (&b, &e);
 120   modify_region (current_buffer, XFASTINT (b), XFASTINT (e));
 121   record_change (XFASTINT (b), XFASTINT (e) - XFASTINT (b));
 122
 123   for (i = XFASTINT (b); i < XFASTINT (e); i++)
 124     {
 125       c = FETCH_CHAR (i);
 126       if (inword && flag != CASE_CAPITALIZE_UP)
 127         c = DOWNCASE (c);
 128       else if (!UPPERCASEP (c)
 129                && (!inword || flag != CASE_CAPITALIZE_UP))
 130         c = UPCASE1 (c);
 131       FETCH_CHAR (i) = c;
 132       if ((int) flag >= (int) CASE_CAPITALIZE)
 133         inword = SYNTAX (c) == Sword;
 134     }
 135
 136   signal_after_change (XFASTINT (b),
 137                        XFASTINT (e) - XFASTINT (b),
 138                        XFASTINT (e) - XFASTINT (b));
 139 }
 140
 141 DEFUN ("upcase-region", Fupcase_region, Supcase_region, 2, 2, "r",
 142   "Convert the region to upper case.  In programs, wants two arguments.\n\
 143 These arguments specify the starting and ending character numbers of\n\
 144 the region to operate on.  When used as a command, the text between\n\
 145 point and the mark is operated on.\n\
 146 See also `capitalize-region'.")
 147   (b, e)
 148      Lisp_Object b, e;
 149 {
 150   casify_region (CASE_UP, b, e);
 151   return Qnil;
 152 }
 153
 154 DEFUN ("downcase-region", Fdowncase_region, Sdowncase_region, 2, 2, "r",
 155   "Convert the region to lower case.  In programs, wants two arguments.\n\
 156 These arguments specify the starting and ending character numbers of\n\
 157 the region to operate on.  When used as a command, the text between\n\
 158 point and the mark is operated on.")
 159   (b, e)
 160      Lisp_Object b, e;
 161 {
 162   casify_region (CASE_DOWN, b, e);
 163   return Qnil;
 164 }
 165
 166 DEFUN ("capitalize-region", Fcapitalize_region, Scapitalize_region, 2, 2, "r",
 167   "Convert the region to capitalized form.\n\
 168 Capitalized form means each word's first character is upper case\n\
 169 and the rest of it is lower case.\n\
 170 In programs, give two arguments, the starting and ending\n\
 171 character positions to operate on.")
 172   (b, e)
 173      Lisp_Object b, e;
 174 {
 175   casify_region (CASE_CAPITALIZE, b, e);
 176   return Qnil;
 177 }
 178
 179 /* Like Fcapitalize but change only the initials.  */
 180
 181 Lisp_Object
 182 upcase_initials_region (b, e)
 183      Lisp_Object b, e;
 184 {
 185   casify_region (CASE_CAPITALIZE_UP, b, e);
 186   return Qnil;
 187 }
 188 \f
 189 Lisp_Object
 190 operate_on_word (arg)
 191      Lisp_Object arg;
 192 {
 193   Lisp_Object val;
 194   int end, farend;
 195
 196   CHECK_NUMBER (arg, 0);
 197   farend = scan_words (point, XINT (arg));
 198   if (!farend)
 199     farend = XINT (arg) > 0 ? ZV : BEGV;
 200
 201   end = point > farend ? point : farend;
 202   SET_PT (end);
 203   XFASTINT (val) = farend;
 204
 205   return val;
 206 }
 207
 208 DEFUN ("upcase-word", Fupcase_word, Supcase_word, 1, 1, "p",
 209   "Convert following word (or ARG words) to upper case, moving over.\n\
 210 With negative argument, convert previous words but do not move.\n\
 211 See also `capitalize-word'.")
 212   (arg)
 213      Lisp_Object arg;
 214 {
 215   Lisp_Object opoint;
 216
 217   XFASTINT (opoint) = point;
 218   casify_region (CASE_UP, opoint, operate_on_word (arg));
 219   return Qnil;
 220 }
 221
 222 DEFUN ("downcase-word", Fdowncase_word, Sdowncase_word, 1, 1, "p",
 223   "Convert following word (or ARG words) to lower case, moving over.\n\
 224 With negative argument, convert previous words but do not move.")
 225   (arg)
 226      Lisp_Object arg;
 227 {
 228   Lisp_Object opoint;
 229   XFASTINT (opoint) = point;
 230   casify_region (CASE_DOWN, opoint, operate_on_word (arg));
 231   return Qnil;
 232 }
 233
 234 DEFUN ("capitalize-word", Fcapitalize_word, Scapitalize_word, 1, 1, "p",
 235   "Capitalize the following word (or ARG words), moving over.\n\
 236 This gives the word(s) a first character in upper case\n\
 237 and the rest lower case.\n\
 238 With negative argument, capitalize previous words but do not move.")
 239   (arg)
 240      Lisp_Object arg;
 241 {
 242   Lisp_Object opoint;
 243   XFASTINT (opoint) = point;
 244   casify_region (CASE_CAPITALIZE, opoint, operate_on_word (arg));
 245   return Qnil;
 246 }
 247 \f
 248 syms_of_casefiddle ()
 249 {
 250   defsubr (&Supcase);
 251   defsubr (&Sdowncase);
 252   defsubr (&Scapitalize);
 253   defsubr (&Supcase_region);
 254   defsubr (&Sdowncase_region);
 255   defsubr (&Scapitalize_region);
 256   defsubr (&Supcase_word);
 257   defsubr (&Sdowncase_word);
 258   defsubr (&Scapitalize_word);
 259 }
 260
 261 keys_of_casefiddle ()
 262 {
 263   initial_define_key (control_x_map, Ctl('U'), "upcase-region");
 264   Fput (intern ("upcase-region"), Qdisabled, Qt);
 265   initial_define_key (control_x_map, Ctl('L'), "downcase-region");
 266   Fput (intern ("downcase-region"), Qdisabled, Qt);
 267
 268   initial_define_key (meta_map, 'u', "upcase-word");
 269   initial_define_key (meta_map, 'l', "downcase-word");
 270   initial_define_key (meta_map, 'c', "capitalize-word");
 271 }