/*
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* Simple pattern matching
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*
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* Author:
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* Gonzalo Paniagua Javier (gonzalo@novell.com
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*
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* (C) 2006 Novell, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <glib.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#ifndef _MSC_VER
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#include <unistd.h>
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#endif
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typedef enum {
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MATCH_LITERAL,
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MATCH_ANYCHAR,
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MATCH_ANYTHING,
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MATCH_ANYTHING_END,
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MATCH_INVALID = -1
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} MatchType;
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typedef struct {
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MatchType type;
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gchar *str;
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} PData;
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struct _GPatternSpec {
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GSList *pattern;
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};
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static GSList *
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compile_pattern (const gchar *pattern)
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{
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GSList *list;
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size_t i, len;
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PData *data;
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gchar c;
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MatchType last = MATCH_INVALID;
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GString *str;
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gboolean free_str;
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if (pattern == NULL)
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return NULL;
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data = NULL;
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list = NULL;
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free_str = TRUE;
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str = g_string_new ("");
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for (i = 0, len = strlen (pattern); i < len; i++) {
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c = pattern [i];
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if (c == '*' || c == '?') {
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if (str->len > 0) {
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data = g_new0 (PData, 1);
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data->type = MATCH_LITERAL;
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data->str = g_string_free (str, FALSE);
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list = g_slist_append (list, data);
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str = g_string_new ("");
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}
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if (last == MATCH_ANYTHING && c == '*')
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continue;
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data = g_new0 (PData, 1);
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data->type = (c == '*') ? MATCH_ANYTHING : MATCH_ANYCHAR;
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list = g_slist_append (list, data);
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last = data->type;
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} else {
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g_string_append_c (str, c);
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last = MATCH_LITERAL;
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}
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}
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if (last == MATCH_ANYTHING && str->len == 0) {
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data->type = MATCH_ANYTHING_END;
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free_str = TRUE;
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} else if (str->len > 0) {
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data = g_new0 (PData, 1);
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data->type = MATCH_LITERAL;
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data->str = str->str;
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free_str = FALSE;
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list = g_slist_append (list, data);
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}
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g_string_free (str, free_str);
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return list;
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}
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#ifdef DEBUG_PATTERN
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static void
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print_pattern (gpointer data, gpointer user_data)
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{
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PData *d = (PData *) data;
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printf ("Type: %s", d->type == MATCH_LITERAL ? "literal" : d->type == MATCH_ANYCHAR ? "any char" : "anything");
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if (d->type == MATCH_LITERAL)
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printf (" String: %s", d->str);
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printf ("\n");
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}
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#endif
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GPatternSpec *
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g_pattern_spec_new (const gchar *pattern)
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{
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GPatternSpec *spec;
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g_return_val_if_fail (pattern != NULL, NULL);
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spec = g_new0 (GPatternSpec, 1);
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if (pattern) {
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spec->pattern = compile_pattern (pattern);
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#ifdef DEBUG_PATTERN
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g_slist_foreach (spec->pattern, print_pattern, NULL);
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printf ("\n");
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#endif
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}
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return spec;
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}
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static void
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free_pdata (gpointer data, gpointer user_data)
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{
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PData *d = (PData *) data;
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if (d->str)
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g_free (d->str);
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g_free (d);
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}
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void
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g_pattern_spec_free (GPatternSpec *pspec)
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{
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if (pspec) {
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g_slist_foreach (pspec->pattern, free_pdata, NULL);
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g_slist_free (pspec->pattern);
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pspec->pattern = NULL;
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}
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g_free (pspec);
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}
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static gboolean
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match_string (GSList *list, const gchar *str, size_t idx, size_t max)
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{
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size_t len;
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while (list && idx < max) {
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PData *data = (PData *) list->data;
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if (data->type == MATCH_ANYTHING_END)
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return TRUE;
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if (data->type == MATCH_LITERAL) {
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len = strlen (data->str);
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if (strncmp (&str [idx], data->str, len) != 0)
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return FALSE;
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idx += len;
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list = list->next;
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if (list) {
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/*
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* When recursing, we need this to avoid returning FALSE
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* because 'list' will not be NULL
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*/
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data = (PData *) list->data;
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if (data->type == MATCH_ANYTHING_END)
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return TRUE;
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}
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} else if (data->type == MATCH_ANYCHAR) {
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idx++;
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list = list->next;
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} else if (data->type == MATCH_ANYTHING) {
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while (idx < max) {
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if (match_string (list->next, str, idx++, max))
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return TRUE;
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}
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return FALSE;
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} else {
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g_assert_not_reached ();
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}
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}
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return (list == NULL && idx >= max);
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}
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gboolean
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g_pattern_match_string (GPatternSpec *pspec, const gchar *string)
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{
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g_return_val_if_fail (pspec != NULL, FALSE);
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g_return_val_if_fail (string != NULL, FALSE);
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if (pspec->pattern == NULL)
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return FALSE;
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return match_string (pspec->pattern, string, 0, strlen (string));
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}
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