--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/casefiddle.c	Mon Aug 13 11:28:15 2007 +0200
@@ -0,0 +1,342 @@
+/* XEmacs case conversion functions.
+   Copyright (C) 1985, 1992, 1993, 1994, 1997, 1998 Free Software Foundation, Inc.
+
+This file is part of XEmacs.
+
+XEmacs is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+XEmacs is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Synched up with: FSF 19.34, but substantially rewritten by Martin. */
+
+#include <config.h>
+#include "lisp.h"
+
+#include "buffer.h"
+#include "insdel.h"
+#include "syntax.h"
+
+enum case_action {CASE_UP, CASE_DOWN, CASE_CAPITALIZE, CASE_CAPITALIZE_UP};
+
+static Lisp_Object
+casify_object (enum case_action flag, Lisp_Object obj, Lisp_Object buffer)
+{
+  struct buffer *buf = decode_buffer (buffer, 0);
+
+ retry:
+
+  if (CHAR_OR_CHAR_INTP (obj))
+    {
+      Emchar c;
+      CHECK_CHAR_COERCE_INT (obj);
+      c = XCHAR (obj);
+      c = (flag == CASE_DOWN) ? DOWNCASE (buf, c) : UPCASE (buf, c);
+      return make_char (c);
+    }
+
+  if (STRINGP (obj))
+    {
+      struct Lisp_Char_Table *syntax_table =
+	XCHAR_TABLE (buf->mirror_syntax_table);
+      Bufbyte *storage =
+	alloca_array (Bufbyte, XSTRING_LENGTH (obj) * MAX_EMCHAR_LEN);
+      Bufbyte *newp = storage;
+      Bufbyte *oldp = XSTRING_DATA (obj);
+      int wordp = 0, wordp_prev;
+
+      while (*oldp)
+	{
+	  Emchar c = charptr_emchar (oldp);
+	  switch (flag)
+	    {
+	    case CASE_UP:
+	      c = UPCASE (buf, c);
+	      break;
+	    case CASE_DOWN:
+	      c = DOWNCASE (buf, c);
+	      break;
+	    case CASE_CAPITALIZE:
+	    case CASE_CAPITALIZE_UP:
+	      wordp_prev = wordp;
+	      wordp = WORD_SYNTAX_P (syntax_table, c);
+	      if (!wordp) break;
+	      if (wordp_prev)
+		{
+		  if (flag == CASE_CAPITALIZE)
+		    c = DOWNCASE (buf, c);
+		}
+	      else
+		c = UPCASE (buf, c);
+	      break;
+	    }
+
+	  newp += set_charptr_emchar (newp, c);
+	  INC_CHARPTR (oldp);
+	}
+
+      return make_string (storage, newp - storage);
+    }
+
+  obj = wrong_type_argument (Qchar_or_string_p, obj);
+  goto retry;
+}
+
+DEFUN ("upcase", Fupcase, 1, 2, 0, /*
+Convert OBJECT to upper case and return that.
+OBJECT may be a character or string.  The result has the same type.
+OBJECT is not altered--the value is a copy.
+See also `capitalize', `downcase' and `upcase-initials'.
+Optional second arg BUFFER specifies which buffer's case tables to use,
+ and defaults to the current buffer.
+*/
+       (object, buffer))
+{
+  return casify_object (CASE_UP, object, buffer);
+}
+
+DEFUN ("downcase", Fdowncase, 1, 2, 0, /*
+Convert OBJECT to lower case and return that.
+OBJECT may be a character or string.  The result has the same type.
+OBJECT is not altered--the value is a copy.
+Optional second arg BUFFER specifies which buffer's case tables to use,
+ and defaults to the current buffer.
+*/
+       (object, buffer))
+{
+  return casify_object (CASE_DOWN, object, buffer);
+}
+
+DEFUN ("capitalize", Fcapitalize, 1, 2, 0, /*
+Convert OBJECT to capitalized form and return that.
+This means that each word's first character is upper case
+and the rest is lower case.
+OBJECT may be a character or string.  The result has the same type.
+OBJECT is not altered--the value is a copy.
+Optional second arg BUFFER specifies which buffer's case tables to use,
+ and defaults to the current buffer.
+*/
+       (object, buffer))
+{
+  return casify_object (CASE_CAPITALIZE, object, buffer);
+}
+
+/* Like Fcapitalize but change only the initial characters.  */
+
+DEFUN ("upcase-initials", Fupcase_initials, 1, 2, 0, /*
+Convert the initial of each word in OBJECT to upper case.
+Do not change the other letters of each word.
+OBJECT may be a character or string.  The result has the same type.
+OBJECT is not altered--the value is a copy.
+Optional second arg BUFFER specifies which buffer's case tables to use,
+ and defaults to the current buffer.
+*/
+       (object, buffer))
+{
+  return casify_object (CASE_CAPITALIZE_UP, object, buffer);
+}
+
+/* flag is CASE_UP, CASE_DOWN or CASE_CAPITALIZE or CASE_CAPITALIZE_UP.
+   b and e specify range of buffer to operate on. */
+
+static void
+casify_region_internal (enum case_action flag, Lisp_Object b, Lisp_Object e,
+			struct buffer *buf)
+{
+  /* This function can GC */
+  REGISTER Bufpos i;
+  Bufpos start, end;
+  struct Lisp_Char_Table *syntax_table = XCHAR_TABLE (buf->mirror_syntax_table);
+  int mccount;
+  Emchar oldc, c;
+  int wordp = 0, wordp_prev;
+
+  if (EQ (b, e))
+    /* Not modifying because nothing marked */
+    return;
+
+  get_buffer_range_char (buf, b, e, &start, &end, 0);
+
+  mccount = begin_multiple_change (buf, start, end);
+  record_change (buf, start, end - start);
+
+  for (i = start; i < end; i++)
+    {
+      c = oldc = BUF_FETCH_CHAR (buf, i);
+
+      switch (flag)
+	{
+	case CASE_UP:
+	  c = UPCASE (buf, oldc);
+	  break;
+	case CASE_DOWN:
+	  c = DOWNCASE (buf, oldc);
+	  break;
+	case CASE_CAPITALIZE:
+	case CASE_CAPITALIZE_UP:
+	  /* !!#### need to revalidate the start and end pointers in case
+	     the buffer was changed */
+	  wordp_prev = wordp;
+	  wordp = WORD_SYNTAX_P (syntax_table, c);
+	  if (!wordp) continue;
+	  if (wordp_prev)
+	    {
+	      if (flag == CASE_CAPITALIZE)
+		c = DOWNCASE (buf, c);
+	    }
+	  else
+	    c = UPCASE (buf, c);
+	  break;
+	}
+
+      if (oldc == c) continue;
+      buffer_replace_char (buf, i, c, 1, (i == start));
+      BUF_MODIFF (buf)++;
+    }
+
+  end_multiple_change (buf, mccount);
+}
+
+static Lisp_Object
+casify_region (enum case_action flag, Lisp_Object b, Lisp_Object e,
+	       Lisp_Object buffer)
+{
+  casify_region_internal (flag, b, e, decode_buffer (buffer, 1));
+  return Qnil;
+}
+
+DEFUN ("upcase-region", Fupcase_region, 2, 3, "r", /*
+Convert the region to upper case.  In programs, wants two arguments.
+These arguments specify the starting and ending character numbers of
+ the region to operate on.  When used as a command, the text between
+ point and the mark is operated on.
+See also `capitalize-region'.
+Optional third arg BUFFER defaults to the current buffer.
+*/
+       (b, e, buffer))
+{
+  /* This function can GC */
+  return casify_region (CASE_UP, b, e, buffer);
+}
+
+DEFUN ("downcase-region", Fdowncase_region, 2, 3, "r", /*
+Convert the region to lower case.  In programs, wants two arguments.
+These arguments specify the starting and ending character numbers of
+ the region to operate on.  When used as a command, the text between
+ point and the mark is operated on.
+Optional third arg BUFFER defaults to the current buffer.
+*/
+       (b, e, buffer))
+{
+  /* This function can GC */
+  return casify_region (CASE_DOWN, b, e, buffer);
+}
+
+DEFUN ("capitalize-region", Fcapitalize_region, 2, 3, "r", /*
+Convert the region to capitalized form.
+Capitalized form means each word's first character is upper case
+ and the rest of it is lower case.
+In programs, give two arguments, the starting and ending
+ character positions to operate on.
+Optional third arg BUFFER defaults to the current buffer.
+*/
+       (b, e, buffer))
+{
+  /* This function can GC */
+  return casify_region (CASE_CAPITALIZE, b, e, buffer);
+}
+
+/* Like Fcapitalize_region but change only the initials.  */
+
+DEFUN ("upcase-initials-region", Fupcase_initials_region, 2, 3, "r", /*
+Upcase the initial of each word in the region.
+Subsequent letters of each word are not changed.
+In programs, give two arguments, the starting and ending
+ character positions to operate on.
+Optional third arg BUFFER defaults to the current buffer.
+*/
+       (b, e, buffer))
+{
+  return casify_region (CASE_CAPITALIZE_UP, b, e, buffer);
+}
+
+
+static Lisp_Object
+casify_word (enum case_action flag, Lisp_Object arg, Lisp_Object buffer)
+{
+  Bufpos farend;
+  struct buffer *buf = decode_buffer (buffer, 1);
+
+  CHECK_INT (arg);
+
+  farend = scan_words (buf, BUF_PT (buf), XINT (arg));
+  if (!farend)
+    farend = XINT (arg) > 0 ? BUF_ZV (buf) : BUF_BEGV (buf);
+
+  casify_region_internal (flag, make_int (BUF_PT (buf)), make_int (farend), buf);
+  BUF_SET_PT (buf, max (BUF_PT (buf), farend));
+  return Qnil;
+}
+
+DEFUN ("upcase-word", Fupcase_word, 1, 2, "p", /*
+Convert following word (or N words) to upper case, moving over.
+With negative argument, convert previous words but do not move.
+See also `capitalize-word'.
+Optional second arg BUFFER defaults to the current buffer.
+*/
+       (n, buffer))
+{
+  /* This function can GC */
+  return casify_word (CASE_UP, n, buffer);
+}
+
+DEFUN ("downcase-word", Fdowncase_word, 1, 2, "p", /*
+Convert following word (or N words) to lower case, moving over.
+With negative argument, convert previous words but do not move.
+Optional second arg BUFFER defaults to the current buffer.
+*/
+       (n, buffer))
+{
+  /* This function can GC */
+  return casify_word (CASE_DOWN, n, buffer);
+}
+
+DEFUN ("capitalize-word", Fcapitalize_word, 1, 2, "p", /*
+Capitalize the following word (or N words), moving over.
+This gives the word(s) a first character in upper case
+ and the rest lower case.
+With negative argument, capitalize previous words but do not move.
+Optional second arg BUFFER defaults to the current buffer.
+*/
+       (n, buffer))
+{
+  /* This function can GC */
+  return casify_word (CASE_CAPITALIZE, n, buffer);
+}
+
+
+void
+syms_of_casefiddle (void)
+{
+  DEFSUBR (Fupcase);
+  DEFSUBR (Fdowncase);
+  DEFSUBR (Fcapitalize);
+  DEFSUBR (Fupcase_initials);
+  DEFSUBR (Fupcase_region);
+  DEFSUBR (Fdowncase_region);
+  DEFSUBR (Fcapitalize_region);
+  DEFSUBR (Fupcase_initials_region);
+  DEFSUBR (Fupcase_word);
+  DEFSUBR (Fdowncase_word);
+  DEFSUBR (Fcapitalize_word);
+}