[Emacs-diffs] Changes to emacs/src/casetab.c [emacs-unicode-2]

[Kenichi Handa]

Index: emacs/src/casetab.c
diff -c /dev/null emacs/src/casetab.c:1.29.4.1
*** /dev/null   Mon Sep  8 08:48:29 2003
--- emacs/src/casetab.c Mon Sep  8 08:48:09 2003
***************
*** 0 ****
--- 1,310 ----
+ /* GNU Emacs routines to deal with case tables.
+    Copyright (C) 1993, 1994 Free Software Foundation, Inc.
+ 
+ This file is part of GNU Emacs.
+ 
+ GNU Emacs 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.
+ 
+ GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
+ the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.  */
+ 
+ /* Written by Howard Gayle.  See chartab.c for details. */
+ 
+ #include <config.h>
+ #include "lisp.h"
+ #include "buffer.h"
+ #include "character.h"
+ 
+ Lisp_Object Qcase_table_p, Qcase_table;
+ Lisp_Object Vascii_downcase_table, Vascii_upcase_table;
+ Lisp_Object Vascii_canon_table, Vascii_eqv_table;
+ 
+ /* Used as a temporary in DOWNCASE and other macros in lisp.h.  No
+    need to mark it, since it is used only very temporarily.  */
+ int case_temp1;
+ Lisp_Object case_temp2;
+ 
+ static void set_canon ();
+ static void set_identity ();
+ static void shuffle ();
+ 
+ DEFUN ("case-table-p", Fcase_table_p, Scase_table_p, 1, 1, 0,
+        doc: /* Return t iff OBJECT is a case table.
+ See `set-case-table' for more information on these data structures.  */)
+      (object)
+      Lisp_Object object;
+ {
+   Lisp_Object up, canon, eqv;
+ 
+   if (! CHAR_TABLE_P (object))
+     return Qnil;
+   if (! EQ (XCHAR_TABLE (object)->purpose, Qcase_table))
+     return Qnil;
+ 
+   up = XCHAR_TABLE (object)->extras[0];
+   canon = XCHAR_TABLE (object)->extras[1];
+   eqv = XCHAR_TABLE (object)->extras[2];
+ 
+   return ((NILP (up) || CHAR_TABLE_P (up))
+         && ((NILP (canon) && NILP (eqv))
+             || (CHAR_TABLE_P (canon)
+                 && (NILP (eqv) || CHAR_TABLE_P (eqv))))
+         ? Qt : Qnil);
+ }
+ 
+ static Lisp_Object
+ check_case_table (obj)
+      Lisp_Object obj;
+ {
+   register Lisp_Object tem;
+ 
+   while (tem = Fcase_table_p (obj), NILP (tem))
+     obj = wrong_type_argument (Qcase_table_p, obj);
+   return (obj);
+ }
+ 
+ DEFUN ("current-case-table", Fcurrent_case_table, Scurrent_case_table, 0, 0, 
0,
+        doc: /* Return the case table of the current buffer.  */)
+      ()
+ {
+   return current_buffer->downcase_table;
+ }
+ 
+ DEFUN ("standard-case-table", Fstandard_case_table, Sstandard_case_table, 0, 
0, 0,
+        doc: /* Return the standard case table.
+ This is the one used for new buffers.  */)
+      ()
+ {
+   return Vascii_downcase_table;
+ }
+ 
+ static Lisp_Object set_case_table ();
+ 
+ DEFUN ("set-case-table", Fset_case_table, Sset_case_table, 1, 1, 0,
+        doc: /* Select a new case table for the current buffer.
+ A case table is a char-table which maps characters
+ to their lower-case equivalents.  It also has three \"extra\" slots
+ which may be additional char-tables or nil.
+ These slots are called UPCASE, CANONICALIZE and EQUIVALENCES.
+ UPCASE maps each character to its upper-case equivalent;
+  if lower and upper case characters are in 1-1 correspondence,
+  you may use nil and the upcase table will be deduced from DOWNCASE.
+ CANONICALIZE maps each character to a canonical equivalent;
+  any two characters that are related by case-conversion have the same
+  canonical equivalent character; it may be nil, in which case it is
+  deduced from DOWNCASE and UPCASE.
+ EQUIVALENCES is a map that cyclicly permutes each equivalence class
+  (of characters with the same canonical equivalent); it may be nil,
+  in which case it is deduced from CANONICALIZE.  */)
+      (table)
+      Lisp_Object table;
+ {
+   return set_case_table (table, 0);
+ }
+ 
+ DEFUN ("set-standard-case-table", Fset_standard_case_table, 
Sset_standard_case_table, 1, 1, 0,
+        doc: /* Select a new standard case table for new buffers.
+ See `set-case-table' for more info on case tables.  */)
+      (table)
+      Lisp_Object table;
+ {
+   return set_case_table (table, 1);
+ }
+ 
+ static Lisp_Object
+ set_case_table (table, standard)
+      Lisp_Object table;
+      int standard;
+ {
+   Lisp_Object up, canon, eqv;
+   Lisp_Object indices[3];
+ 
+   check_case_table (table);
+ 
+   up = XCHAR_TABLE (table)->extras[0];
+   canon = XCHAR_TABLE (table)->extras[1];
+   eqv = XCHAR_TABLE (table)->extras[2];
+ 
+   if (NILP (up))
+     {
+       up = Fmake_char_table (Qcase_table, Qnil);
+       map_char_table (set_identity, Qnil, table, up);
+       map_char_table (shuffle, Qnil, table, up);
+       XCHAR_TABLE (table)->extras[0] = up;
+     }
+ 
+   if (NILP (canon))
+     {
+       canon = Fmake_char_table (Qcase_table, Qnil);
+       XCHAR_TABLE (table)->extras[1] = canon;
+       map_char_table (set_canon, Qnil, table, table);
+     }
+ 
+   if (NILP (eqv))
+     {
+       eqv = Fmake_char_table (Qcase_table, Qnil);
+       map_char_table (set_identity, Qnil, canon, eqv);
+       map_char_table (shuffle, Qnil, canon, eqv);
+       XCHAR_TABLE (table)->extras[2] = eqv;
+     }
+ 
+   /* This is so set_image_of_range_1 in regex.c can find the EQV table.  */
+   XCHAR_TABLE (canon)->extras[2] = eqv;
+ 
+   if (standard)
+     Vascii_downcase_table = table;
+   else
+     {
+       current_buffer->downcase_table = table;
+       current_buffer->upcase_table = up;
+       current_buffer->case_canon_table = canon;
+       current_buffer->case_eqv_table = eqv;
+     }
+ 
+   return table;
+ }
+ 
+ /* The following functions are called in map_char_table.  */
+ 
+ /* Set CANON char-table element for characters in RANGE to a
+    translated ELT by UP and DOWN char-tables.  This is done only when
+    ELT is a character.  The char-tables CANON, UP, and DOWN are in
+    CASE_TABLE.  */
+ 
+ static void
+ set_canon (case_table, range, elt)
+      Lisp_Object case_table, range, elt;
+ {
+   Lisp_Object up = XCHAR_TABLE (case_table)->extras[0];
+   Lisp_Object canon = XCHAR_TABLE (case_table)->extras[1];
+ 
+   if (NATNUMP (elt))
+     Fset_char_table_range (canon, range, Faref (case_table, Faref (up, elt)));
+ }
+ 
+ /* Set elements of char-table TABLE for C to C itself.  C may be a
+    cons specifying a character range.  In that case, set characters in
+    that range to themselves.  This is done only when ELT is a
+    character.  This is called in map_char_table.  */
+ 
+ static void
+ set_identity (table, c, elt)
+      Lisp_Object table, c, elt;
+ {
+   if (NATNUMP (elt))
+     {
+       int from, to;
+ 
+       if (CONSP (c))
+       {
+         from = XINT (XCAR (c));
+         to = XINT (XCDR (c));
+       }
+       else
+       from = to = XINT (c);
+       for (; from <= to; from++)
+       CHAR_TABLE_SET (table, from, make_number (from));
+     }
+ }
+ 
+ /* Permute the elements of TABLE (which is initially an identity
+    mapping) so that it has one cycle for each equivalence class
+    induced by the translation table on which map_char_table is
+    operated.  */
+ 
+ static void
+ shuffle (table, c, elt)
+      Lisp_Object table, c, elt;
+ {
+   if (NATNUMP (elt))
+     {
+       Lisp_Object tem = Faref (table, elt);
+       int from, to;
+ 
+       if (CONSP (c))
+       {
+         from = XINT (XCAR (c));
+         to = XINT (XCDR (c));
+       }
+       else
+       from = to = XINT (c);
+ 
+       for (; from <= to; from++)
+       if (from != XINT (elt))
+         {
+           Faset (table, elt, make_number (from));
+           Faset (table, make_number (from), tem);
+         }
+     }
+ }
+ 
+ void
+ init_casetab_once ()
+ {
+   register int i;
+   Lisp_Object down, up;
+   Qcase_table = intern ("case-table");
+   staticpro (&Qcase_table);
+ 
+   /* Intern this now in case it isn't already done.
+      Setting this variable twice is harmless.
+      But don't staticpro it here--that is done in alloc.c.  */
+   Qchar_table_extra_slots = intern ("char-table-extra-slots");
+ 
+   /* Now we are ready to set up this property, so we can
+      create char tables.  */
+   Fput (Qcase_table, Qchar_table_extra_slots, make_number (3));
+ 
+   down = Fmake_char_table (Qcase_table, Qnil);
+   Vascii_downcase_table = down;
+   XCHAR_TABLE (down)->purpose = Qcase_table;
+ 
+   for (i = 0; i < 128; i++)
+     {
+       int c = (i >= 'A' && i <= 'Z') ? i + ('a' - 'A') : i;
+       CHAR_TABLE_SET (down, i, make_number (c));
+     }
+ 
+   XCHAR_TABLE (down)->extras[1] = Fcopy_sequence (down);
+ 
+   up = Fmake_char_table (Qcase_table, Qnil);
+   XCHAR_TABLE (down)->extras[0] = up;
+ 
+   for (i = 0; i < 128; i++)
+     {
+       int c = ((i >= 'A' && i <= 'Z') ? i + ('a' - 'A')
+              : ((i >= 'a' && i <= 'z') ? i + ('A' - 'a')
+                 : i));;
+       CHAR_TABLE_SET (up, i, make_number (c));
+     }
+ 
+   XCHAR_TABLE (down)->extras[2] = Fcopy_sequence (up);
+ }
+ 
+ void
+ syms_of_casetab ()
+ {
+   Qcase_table_p = intern ("case-table-p");
+   staticpro (&Qcase_table_p);
+ 
+   staticpro (&Vascii_canon_table);
+   staticpro (&Vascii_downcase_table);
+   staticpro (&Vascii_eqv_table);
+   staticpro (&Vascii_upcase_table);
+ 
+   defsubr (&Scase_table_p);
+   defsubr (&Scurrent_case_table);
+   defsubr (&Sstandard_case_table);
+   defsubr (&Sset_case_table);
+   defsubr (&Sset_standard_case_table);
+ }