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ca99cfdd14
data structures that scale better with large character sets, instead of arrays indexed by character value: - Sets of characters to delete/squeeze are stored in a new "cset" structure, which is implemented as a splay tree of extents. This structure has the ability to store character classes (ala wctype(3)), but this is not currently fully utilized. - Mappings between characters are stored in a new "cmap" structure, which is also a splay tree. - The parser no longer builds arrays containing all the characters in a particular class; instead, next() determines them on-the-fly using nextwctype(3).
84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/*-
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* Copyright (c) 2004 Tim J. Robbins.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef CMAP_H
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#define CMAP_H
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#include <limits.h>
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#include <stdbool.h>
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#include <wchar.h>
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struct cmapnode {
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wint_t cmn_from;
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wint_t cmn_to;
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struct cmapnode *cmn_left;
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struct cmapnode *cmn_right;
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};
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struct cmap {
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#define CM_CACHE_SIZE 128
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wint_t cm_cache[CM_CACHE_SIZE];
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bool cm_havecache;
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struct cmapnode *cm_root;
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#define CM_DEF_SELF -2
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wint_t cm_def;
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wint_t cm_min;
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wint_t cm_max;
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};
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struct cmap * cmap_alloc(void);
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bool cmap_add(struct cmap *, wint_t, wint_t);
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wint_t cmap_lookup_hard(struct cmap *, wint_t);
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void cmap_cache(struct cmap *);
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wint_t cmap_default(struct cmap *, wint_t);
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static __inline wint_t
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cmap_lookup(struct cmap *cm, wint_t from)
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{
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if (from < CM_CACHE_SIZE && cm->cm_havecache)
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return (cm->cm_cache[from]);
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return (cmap_lookup_hard(cm, from));
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}
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static __inline wint_t
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cmap_min(struct cmap *cm)
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{
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return (cm->cm_min);
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}
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static __inline wint_t
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cmap_max(struct cmap *cm)
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{
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return (cm->cm_max);
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}
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#endif
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