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/* 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 "charset.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,
  "Return t iff OBJECT is a case table.\n\
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,
  "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,
  "Return the standard case table.\n\
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,
  "Select a new case table for the current buffer.\n\
A case table is a char-table which maps characters\n\
to their lower-case equivalents. It also has three \"extra\" slots\n\
which may be additional char-tables or nil.\n\
These slots are called UPCASE, CANONICALIZE and EQUIVALENCES.\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; it may be nil, in which case it is\n\
deduced from DOWNCASE and UPCASE.\n\
EQUIVALENCES is a map that cyclicly permutes each equivalence class\n\
(of characters with the same canonical equivalent); it may be nil,\n\
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,
  "Select a new standard case table for new buffers.\n\
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, 0, indices);
      map_char_table (shuffle, Qnil, table, up, 0, indices);
      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, 0, indices);
    }

  if (NILP (eqv))
    {
      eqv = Fmake_char_table (Qcase_table, Qnil);
      map_char_table (set_identity, Qnil, canon, eqv, 0, indices);
      map_char_table (shuffle, Qnil, canon, eqv, 0, indices);
      XCHAR_TABLE (table)->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 C 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, c, elt)
     Lisp_Object case_table, c, elt;
{
  Lisp_Object up = XCHAR_TABLE (case_table)->extras[0];
  Lisp_Object canon = XCHAR_TABLE (case_table)->extras[1];

  if (NATNUMP (elt))
    Faset (canon, c, Faref (case_table, Faref (up, elt)));
}

/* Set elements of char-table TABLE for C to C itself. 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))
    Faset (table, c, c);
}

/* 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) && !EQ (c, elt))
    {
      Lisp_Object tem = Faref (table, elt);
      Faset (table, elt, c);
      Faset (table, c, tem);
    }
}

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 < CHAR_TABLE_SINGLE_BYTE_SLOTS; i++)
    XSETFASTINT (XCHAR_TABLE (down)->contents[i],
(i >= 'A' && i <= 'Z') ? i + ('a' - 'A') : i);

  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 < CHAR_TABLE_SINGLE_BYTE_SLOTS; i++)
    XSETFASTINT (XCHAR_TABLE (up)->contents[i],
((i >= 'A' && i <= 'Z')
? i + ('a' - 'A')
: ((i >= 'a' && i <= 'z')
? i + ('A' - 'a')
: i)));

  XCHAR_TABLE (down)->extras[2] = Fcopy_sequence (up);
}

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);
}
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