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334 lines
9.3 KiB
C
334 lines
9.3 KiB
C
/* GPattern copy that supports raw (non-utf8) matching
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* based on: GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997, 1999 Peter Mattis, Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "patternspec.h"
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#include <string.h>
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typedef enum
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{
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MATCH_ALL, /* "*A?A*" */
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MATCH_ALL_TAIL, /* "*A?AA" */
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MATCH_HEAD, /* "AAAA*" */
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MATCH_TAIL, /* "*AAAA" */
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MATCH_EXACT, /* "AAAAA" */
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MATCH_LAST
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} MatchType;
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struct _PatternSpec
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{
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MatchMode match_mode;
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MatchType match_type;
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guint pattern_length;
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guint min_length;
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guint max_length;
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gchar *pattern;
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};
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static inline gchar *
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raw_strreverse (const gchar * str, gssize size)
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{
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g_assert (size > 0);
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return g_strreverse (g_strndup (str, size));
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}
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static inline gboolean
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pattern_ph_match (const gchar * match_pattern, MatchMode match_mode,
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const gchar * match_string, gboolean * wildcard_reached_p)
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{
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register const gchar *pattern, *string;
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register gchar ch;
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pattern = match_pattern;
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string = match_string;
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ch = *pattern;
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pattern++;
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while (ch) {
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switch (ch) {
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case '?':
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if (!*string)
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return FALSE;
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if (match_mode == MATCH_MODE_UTF8)
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string = g_utf8_next_char (string);
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else
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++string;
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break;
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case '*':
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*wildcard_reached_p = TRUE;
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do {
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ch = *pattern;
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pattern++;
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if (ch == '?') {
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if (!*string)
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return FALSE;
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if (match_mode == MATCH_MODE_UTF8)
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string = g_utf8_next_char (string);
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else
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++string;
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}
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}
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while (ch == '*' || ch == '?');
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if (!ch)
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return TRUE;
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do {
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gboolean next_wildcard_reached = FALSE;
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while (ch != *string) {
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if (!*string)
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return FALSE;
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if (match_mode == MATCH_MODE_UTF8)
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string = g_utf8_next_char (string);
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else
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++string;
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}
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string++;
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if (pattern_ph_match (pattern, match_mode, string,
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&next_wildcard_reached))
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return TRUE;
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if (next_wildcard_reached)
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/* the forthcoming pattern substring up to the next wildcard has
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* been matched, but a mismatch occurred for the rest of the
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* pattern, following the next wildcard.
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* there's no need to advance the current match position any
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* further if the rest pattern will not match.
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*/
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return FALSE;
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}
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while (*string);
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break;
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default:
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if (ch == *string)
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string++;
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else
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return FALSE;
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break;
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}
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ch = *pattern;
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pattern++;
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}
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return *string == 0;
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}
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static gboolean
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pattern_match (PatternSpec * pspec, guint string_length,
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const gchar * string, const gchar * string_reversed)
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{
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MatchMode match_mode;
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g_assert (pspec != NULL);
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g_assert (string != NULL);
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if (string_length < pspec->min_length || string_length > pspec->max_length)
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return FALSE;
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match_mode = pspec->match_mode;
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if (match_mode == MATCH_MODE_AUTO) {
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if (!g_utf8_validate (string, string_length, NULL))
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match_mode = MATCH_MODE_RAW;
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else
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match_mode = MATCH_MODE_UTF8;
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}
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switch (pspec->match_type) {
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gboolean dummy;
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case MATCH_ALL:
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return pattern_ph_match (pspec->pattern, match_mode, string, &dummy);
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case MATCH_ALL_TAIL:
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if (string_reversed)
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return pattern_ph_match (pspec->pattern, match_mode, string_reversed,
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&dummy);
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else {
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gboolean result;
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gchar *tmp;
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if (match_mode == MATCH_MODE_UTF8) {
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tmp = g_utf8_strreverse (string, string_length);
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} else {
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tmp = raw_strreverse (string, string_length);
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}
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result = pattern_ph_match (pspec->pattern, match_mode, tmp, &dummy);
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g_free (tmp);
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return result;
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}
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case MATCH_HEAD:
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if (pspec->pattern_length == string_length)
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return memcmp (pspec->pattern, string, string_length) == 0;
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else if (pspec->pattern_length)
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return memcmp (pspec->pattern, string, pspec->pattern_length) == 0;
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else
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return TRUE;
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case MATCH_TAIL:
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if (pspec->pattern_length)
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/* compare incl. NUL terminator */
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return memcmp (pspec->pattern,
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string + (string_length - pspec->pattern_length),
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pspec->pattern_length + 1) == 0;
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else
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return TRUE;
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case MATCH_EXACT:
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if (pspec->pattern_length != string_length)
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return FALSE;
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else
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return memcmp (pspec->pattern, string, string_length) == 0;
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default:
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g_return_val_if_fail (pspec->match_type < MATCH_LAST, FALSE);
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return FALSE;
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}
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}
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PatternSpec *
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pattern_spec_new (const gchar * pattern, MatchMode match_mode)
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{
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PatternSpec *pspec;
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gboolean seen_joker = FALSE, seen_wildcard = FALSE, more_wildcards = FALSE;
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gint hw_pos = -1, tw_pos = -1, hj_pos = -1, tj_pos = -1;
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gboolean follows_wildcard = FALSE;
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guint pending_jokers = 0;
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const gchar *s;
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gchar *d;
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guint i;
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g_assert (pattern != NULL);
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g_assert (match_mode != MATCH_MODE_UTF8
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|| g_utf8_validate (pattern, -1, NULL));
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/* canonicalize pattern and collect necessary stats */
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pspec = g_new (PatternSpec, 1);
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pspec->match_mode = match_mode;
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pspec->pattern_length = strlen (pattern);
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pspec->min_length = 0;
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pspec->max_length = 0;
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pspec->pattern = g_new (gchar, pspec->pattern_length + 1);
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if (pspec->match_mode == MATCH_MODE_AUTO) {
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if (!g_utf8_validate (pattern, -1, NULL))
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pspec->match_mode = MATCH_MODE_RAW;
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}
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d = pspec->pattern;
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for (i = 0, s = pattern; *s != 0; s++) {
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switch (*s) {
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case '*':
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if (follows_wildcard) { /* compress multiple wildcards */
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pspec->pattern_length--;
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continue;
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}
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follows_wildcard = TRUE;
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if (hw_pos < 0)
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hw_pos = i;
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tw_pos = i;
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break;
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case '?':
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pending_jokers++;
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pspec->min_length++;
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if (pspec->match_mode == MATCH_MODE_RAW) {
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pspec->max_length += 1;
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} else {
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pspec->max_length += 4; /* maximum UTF-8 character length */
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}
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continue;
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default:
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for (; pending_jokers; pending_jokers--, i++) {
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*d++ = '?';
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if (hj_pos < 0)
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hj_pos = i;
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tj_pos = i;
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}
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follows_wildcard = FALSE;
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pspec->min_length++;
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pspec->max_length++;
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break;
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}
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*d++ = *s;
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i++;
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}
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for (; pending_jokers; pending_jokers--) {
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*d++ = '?';
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if (hj_pos < 0)
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hj_pos = i;
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tj_pos = i;
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}
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*d++ = 0;
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seen_joker = hj_pos >= 0;
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seen_wildcard = hw_pos >= 0;
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more_wildcards = seen_wildcard && hw_pos != tw_pos;
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if (seen_wildcard)
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pspec->max_length = G_MAXUINT;
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/* special case sole head/tail wildcard or exact matches */
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if (!seen_joker && !more_wildcards) {
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if (pspec->pattern[0] == '*') {
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pspec->match_type = MATCH_TAIL;
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memmove (pspec->pattern, pspec->pattern + 1, --pspec->pattern_length);
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pspec->pattern[pspec->pattern_length] = 0;
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return pspec;
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}
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if (pspec->pattern_length > 0 &&
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pspec->pattern[pspec->pattern_length - 1] == '*') {
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pspec->match_type = MATCH_HEAD;
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pspec->pattern[--pspec->pattern_length] = 0;
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return pspec;
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}
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if (!seen_wildcard) {
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pspec->match_type = MATCH_EXACT;
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return pspec;
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}
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}
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/* now just need to distinguish between head or tail match start */
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tw_pos = pspec->pattern_length - 1 - tw_pos; /* last pos to tail distance */
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tj_pos = pspec->pattern_length - 1 - tj_pos; /* last pos to tail distance */
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if (seen_wildcard)
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pspec->match_type = tw_pos > hw_pos ? MATCH_ALL_TAIL : MATCH_ALL;
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else /* seen_joker */
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pspec->match_type = tj_pos > hj_pos ? MATCH_ALL_TAIL : MATCH_ALL;
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if (pspec->match_type == MATCH_ALL_TAIL) {
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gchar *tmp = pspec->pattern;
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if (pspec->match_mode == MATCH_MODE_RAW) {
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pspec->pattern = raw_strreverse (pspec->pattern, pspec->pattern_length);
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} else {
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pspec->pattern =
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g_utf8_strreverse (pspec->pattern, pspec->pattern_length);
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}
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g_free (tmp);
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}
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return pspec;
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}
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void
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pattern_spec_free (PatternSpec * pspec)
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{
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g_assert (pspec != NULL);
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g_free (pspec->pattern);
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g_free (pspec);
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}
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gboolean
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pattern_match_string (PatternSpec * pspec, const gchar * string)
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{
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return pattern_match (pspec, strlen (string), string, NULL);
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}
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