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view src/casetab.h @ 4407:4ee73bbe4f8e
Always use boyer_moore in ASCII or Latin-1 buffers with ASCII search strings.
2007-12-26 Aidan Kehoe <kehoea@parhasard.net>
* casetab.c:
Extend and correct some case table documentation.
* search.c (search_buffer):
Correct a bug where only the first entry for a character in the
case equivalence table was examined in determining if the
Boyer-Moore search algorithm is appropriate.
If there are case mappings outside of the charset and row of the
characters specified in the search string, those case mappings can
be safely ignored (and Boyer-Moore search can be used) if we know
from the buffer statistics that the corresponding characters cannot
occur.
* search.c (boyer_moore):
Assert that we haven't been passed a string with varying
characters sets or rows within character sets. That's what
simple_search is for.
In the very rare event that a character in the search string has a
canonical case mapping that is not in the same character set and
row, don't try to search for the canonical character, search for
some other character that is in the the desired character set and
row. Assert that the case table isn't corrupt.
Do not search for any character case mappings that cannot possibly
occur in the buffer, given the buffer metadata about its
contents.
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Wed, 26 Dec 2007 17:30:16 +0100 |
| parents | 1e7cc382eb16 |
| children | e0db3c197671 |
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/* XEmacs routines to deal with case tables. Copyright (C) 2000 Yoshiki Hayashi. Copyright (C) 2002 Ben Wing. 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: Not in FSF. */ #ifndef INCLUDED_casetab_h_ #define INCLUDED_casetab_h_ struct Lisp_Case_Table { struct LCRECORD_HEADER header; Lisp_Object downcase_table; Lisp_Object upcase_table; Lisp_Object case_canon_table; Lisp_Object case_eqv_table; int dirty; }; typedef struct Lisp_Case_Table Lisp_Case_Table; DECLARE_LRECORD (case_table, Lisp_Case_Table); #define XCASE_TABLE(x) XRECORD (x, case_table, Lisp_Case_Table) #define wrap_case_table(p) wrap_record (p, case_table) #define CASE_TABLEP(x) RECORDP (x, case_table) #define CHECK_CASE_TABLE(x) CHECK_RECORD (x, case_table) #define CONCHECK_CASE_TABLE(x) CONCHECK_RECORD (x, case_table) void recompute_case_table (Lisp_Object casetab); DECLARE_INLINE_HEADER ( Lisp_Case_Table * XCASE_TABLE_UPDATE (Lisp_Object table) ) { Lisp_Case_Table *ct = XCASE_TABLE (table); /* If the table is dirty (changes have been made without ancillary structures updated), recompute first. */ if (ct->dirty) recompute_case_table (table); return ct; } #define CASE_TABLE_DOWNCASE(ct) ((ct)->downcase_table) #define CASE_TABLE_UPCASE(ct) ((ct)->upcase_table) #define CASE_TABLE_CANON(ct) ((ct)->case_canon_table) #define CASE_TABLE_EQV(ct) ((ct)->case_eqv_table) #define XCASE_TABLE_DOWNCASE(ct) (XCASE_TABLE (ct)->downcase_table) #define XCASE_TABLE_UPCASE(ct) (XCASE_TABLE (ct)->upcase_table) /* Only do automatic updating for canon and eqv, which are the two that are automatically computed and that are not up to date. These are not normally used by the simple case routines. canon is used by compare-buffer-substrings when case-insensitive and by the regex routines, and eqv is used only by the Boyer-Moore search routines. */ #define XCASE_TABLE_CANON(ct) (XCASE_TABLE_UPDATE (ct)->case_canon_table) #define XCASE_TABLE_EQV(ct) (XCASE_TABLE_UPDATE (ct)->case_eqv_table) #define SET_CASE_TABLE_DOWNCASE(ct, p) ((ct)->downcase_table = p) #define SET_CASE_TABLE_UPCASE(ct, p) ((ct)->upcase_table = p) #define SET_CASE_TABLE_CANON(ct, p) ((ct)->case_canon_table = p) #define SET_CASE_TABLE_EQV(ct, p) ((ct)->case_eqv_table = p) #define XSET_CASE_TABLE_DOWNCASE(ct, p) \ SET_CASE_TABLE_DOWNCASE (XCASE_TABLE (ct), p) #define XSET_CASE_TABLE_UPCASE(ct, p) \ SET_CASE_TABLE_UPCASE (XCASE_TABLE (ct), p) #define XSET_CASE_TABLE_CANON(ct, p) \ SET_CASE_TABLE_CANON (XCASE_TABLE (ct), p) #define XSET_CASE_TABLE_EQV(ct, p) \ SET_CASE_TABLE_EQV (XCASE_TABLE (ct), p) extern Lisp_Object Vstandard_case_table; #endif /* INCLUDED_casetab_h_ */