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-/* GNU Emacs routines to deal with case tables.
- Copyright (C) 1987 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-/* Written by Howard Gayle. See chartab.c for details. */
-
-#include "config.h"
-#include "lisp.h"
-#include "buffer.h"
-
-Lisp_Object Qcase_table_p;
-Lisp_Object Vascii_downcase_table, Vascii_upcase_table;
-Lisp_Object Vascii_canon_table, Vascii_eqv_table;
-
-void compute_trt_inverse ();
-
-DEFUN ("case-table-p", Fcase_table_p, Scase_table_p, 1, 1, 0,
- "Return t iff ARG is a case table.\n\
-See `set-case-table' for more information on these data structures.")
- (table)
- Lisp_Object table;
-{
- Lisp_Object down, up, canon, eqv;
- down = Fcar_safe (table);
- up = Fcar_safe (Fcdr_safe (table));
- canon = Fcar_safe (Fcdr_safe (Fcdr_safe (table)));
- eqv = Fcar_safe (Fcdr_safe (Fcdr_safe (Fcdr_safe (table))));
-
-#define STRING256_P(obj) \
- (XTYPE (obj) == Lisp_String && XSTRING (obj)->size == 256)
-
- return (STRING256_P (down)
- && (NULL (up) || STRING256_P (up))
- && ((NULL (canon) && NULL (eqv))
- || (STRING256_P (canon) && STRING256_P (eqv)))
- ? Qt : Qnil);
-}
-
-static Lisp_Object
-check_case_table (obj)
- Lisp_Object obj;
-{
- register Lisp_Object tem;
-
- while (tem = Fcase_table_p (obj), NULL (tem))
- obj = wrong_type_argument (Qcase_table_p, obj, 0);
- return (obj);
-}
-
-DEFUN ("current-case-table", Fcurrent_case_table, Scurrent_case_table, 0, 0, 0,
- "Return the case table of the current buffer.")
- ()
-{
- Lisp_Object down, up, canon, eqv;
-
- down = current_buffer->downcase_table;
- up = current_buffer->upcase_table;
- canon = current_buffer->case_canon_table;
- eqv = current_buffer->case_eqv_table;
-
- return Fcons (down, Fcons (up, Fcons (canon, Fcons (eqv, Qnil))));
-}
-
-DEFUN ("standard-case-table", Fstandard_case_table,
- Sstandard_case_table, 0, 0, 0,
- "Return the standard case table.\n\
-This is the one used for new buffers.")
- ()
-{
- return Fcons (Vascii_downcase_table,
- Fcons (Vascii_upcase_table,
- Fcons (Vascii_canon_table,
- Fcons (Vascii_eqv_table, Qnil))));
-}
-
-DEFUN ("set-case-table", Fset_case_table, Sset_case_table, 1, 1, 0,
- "Select a new case table for the current buffer.\n\
-A case table is a list (DOWNCASE UPCASE CANONICALIZE EQUIVALENCES)\n\
- where each element is either nil or a string of length 256.\n\
-DOWNCASE maps each character to its lower-case equivalent.\n\
-UPCASE maps each character to its upper-case equivalent;\n\
- if lower and upper case characters are in 1-1 correspondence,\n\
- you may use nil and the upcase table will be deduced from DOWNCASE.\n\
-CANONICALIZE maps each character to a canonical equivalent;\n\
- any two characters that are related by case-conversion have the same\n\
- canonical equivalent character.\n\
-EQUIVALENCES is a map that cyclicly permutes each equivalence class\n\
- (of characters with the same canonical equivalent).\n\
-Both CANONICALIZE and EQUIVALENCES may be nil, in which case\n\
- both are deduced from DOWNCASE and UPCASE.")
- (table)
- Lisp_Object table;
-{
- set_case_table (table, 0);
-}
-
-DEFUN ("set-standard-case-table",
- Fset_standard_case_table, Sset_standard_case_table, 1, 1, 0,
- "Select a new standard case table for new buffers.\n\
-See `set-case-table' for more info on case tables.")
- (table)
- Lisp_Object table;
-{
- set_case_table (table, 1);
-}
-
-set_case_table (table, standard)
- Lisp_Object table;
- int standard;
-{
- Lisp_Object down, up, canon, eqv;
-
- check_case_table (table);
-
- down = Fcar_safe (table);
- up = Fcar_safe (Fcdr_safe (table));
- canon = Fcar_safe (Fcdr_safe (Fcdr_safe (table)));
- eqv = Fcar_safe (Fcdr_safe (Fcdr_safe (Fcdr_safe (table))));
-
- if (NULL (up))
- {
- up = Fmake_string (make_number (256), make_number (0));
- compute_trt_inverse (XSTRING (down)->data, XSTRING (up)->data);
- }
-
- if (NULL (canon))
- {
- register int i;
- unsigned char *upvec = XSTRING (up)->data;
- unsigned char *downvec = XSTRING (down)->data;
-
- canon = Fmake_string (make_number (256), make_number (0));
- eqv = Fmake_string (make_number (256), make_number (0));
-
- /* Set up the CANON vector; for each character,
- this sequence of upcasing and downcasing ought to
- get the "preferred" lowercase equivalent. */
- for (i = 0; i < 256; i++)
- XSTRING (canon)->data[i] = downvec[upvec[downvec[i]]];
-
- compute_trt_inverse (XSTRING (canon)->data, XSTRING (eqv)->data);
- }
-
- if (standard)
- {
- Vascii_downcase_table = down;
- Vascii_upcase_table = up;
- Vascii_canon_table = canon;
- Vascii_eqv_table = eqv;
- }
- else
- {
- current_buffer->downcase_table = down;
- current_buffer->upcase_table = up;
- current_buffer->case_canon_table = canon;
- current_buffer->case_eqv_table = eqv;
- }
- return table;
-}
-
-/* Given a translate table TRT, store the inverse mapping into INVERSE.
- Since TRT is not one-to-one, INVERSE is not a simple mapping.
- Instead, it divides the space of characters into equivalence classes.
- All characters in a given class form one circular list, chained through
- the elements of INVERSE. */
-
-void
-compute_trt_inverse (trt, inverse)
- register unsigned char *trt;
- register unsigned char *inverse;
-{
- register int i = 0400;
- register unsigned char c, q;
-
- while (i--)
- inverse[i] = i;
- i = 0400;
- while (i--)
- {
- if ((q = trt[i]) != (unsigned char) i)
- {
- c = inverse[q];
- inverse[q] = i;
- inverse[i] = c;
- }
- }
-}
-
-init_casetab_once ()
-{
- register int i;
- Lisp_Object tem;
-
- tem = Fmake_string (make_number (256), make_number (0));
- Vascii_downcase_table = tem;
- Vascii_canon_table = tem;
-
- for (i = 0; i < 256; i++)
- XSTRING (tem)->data[i] = (i >= 'A' && i <= 'Z') ? i + 040 : i;
-
- tem = Fmake_string (make_number (256), make_number (0));
- Vascii_upcase_table = tem;
- Vascii_eqv_table = tem;
-
- for (i = 0; i < 256; i++)
- XSTRING (tem)->data[i]
- = ((i >= 'A' && i <= 'Z')
- ? i + ('a' - 'A')
- : ((i >= 'a' && i <= 'z')
- ? i + ('A' - 'a')
- : i));
-}
-
-syms_of_casetab ()
-{
- Qcase_table_p = intern ("case-table-p");
- staticpro (&Qcase_table_p);
- staticpro (&Vascii_downcase_table);
- staticpro (&Vascii_upcase_table);
- staticpro (&Vascii_canon_table);
- staticpro (&Vascii_eqv_table);
-
- defsubr (&Scase_table_p);
- defsubr (&Scurrent_case_table);
- defsubr (&Sstandard_case_table);
- defsubr (&Sset_case_table);
- defsubr (&Sset_standard_case_table);
-
-#if 0
- DEFVAR_LISP ("ascii-downcase-table", &Vascii_downcase_table,
- "String mapping ASCII characters to lowercase equivalents.");
- DEFVAR_LISP ("ascii-upcase-table", &Vascii_upcase_table,
- "String mapping ASCII characters to uppercase equivalents.");
-#endif
-}
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