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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
*
* Copyright (C) 2016 Richard Hughes <richard@hughsie.com>
*
* Licensed under the GNU General Public License Version 2
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <glib/gi18n.h>
#ifdef HAVE_LIBSTEMMER
#include "libstemmer.h"
#endif
#include "as-stemmer.h"
#include "as-ref-string.h"
struct _AsStemmer
{
GObject parent_instance;
gboolean enabled;
GHashTable *hash;
struct sb_stemmer *ctx;
GMutex ctx_mutex;
};
G_DEFINE_TYPE (AsStemmer, as_stemmer, G_TYPE_OBJECT)
/**
* as_stemmer_process:
* @stemmer: A #AsStemmer
* @value: The input string
*
* Stems a string using the Porter algorithm.
*
* Since: 0.2.2
*
* Returns: A new refcounted string
**/
AsRefString *
as_stemmer_process (AsStemmer *stemmer, const gchar *value)
{
#ifdef HAVE_LIBSTEMMER
AsRefString *new;
const gchar *tmp;
gsize value_len;
g_autofree gchar *value_casefold = NULL;
g_autoptr(GMutexLocker) locker = g_mutex_locker_new (&stemmer->ctx_mutex);
/* look for word in the cache */
new = g_hash_table_lookup (stemmer->hash, value);
if (new != NULL)
return as_ref_string_ref (new);
/* not enabled */
value_casefold = g_utf8_casefold (value, -1);
if (stemmer->ctx == NULL || !stemmer->enabled)
return as_ref_string_new (value_casefold);
/* stem, then add to the cache */
value_len = strlen (value_casefold);
tmp = (const gchar *) sb_stemmer_stem (stemmer->ctx,
(guchar *) value_casefold,
(gint) value_len);
if (value_len == (gsize) sb_stemmer_length (stemmer->ctx)) {
new = as_ref_string_new_with_length (value_casefold, value_len);
} else {
new = as_ref_string_new (tmp);
}
g_hash_table_insert (stemmer->hash,
as_ref_string_new (value_casefold),
as_ref_string_ref (new));
return new;
#else
g_autofree gchar *value_casefold = NULL;
value_casefold = g_utf8_casefold (value, -1);
return as_ref_string_new (value_casefold);
#endif
}
static void
as_stemmer_finalize (GObject *object)
{
AsStemmer *stemmer = AS_STEMMER (object);
#ifdef HAVE_LIBSTEMMER
sb_stemmer_delete (stemmer->ctx);
g_mutex_clear (&stemmer->ctx_mutex);
#endif
g_hash_table_unref (stemmer->hash);
G_OBJECT_CLASS (as_stemmer_parent_class)->finalize (object);
}
static void
as_stemmer_class_init (AsStemmerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = as_stemmer_finalize;
}
static void
as_stemmer_init (AsStemmer *stemmer)
{
/* FIXME: use as_utils_locale_to_language()? */
#ifdef HAVE_LIBSTEMMER
stemmer->ctx = sb_stemmer_new ("en", NULL);
g_mutex_init (&stemmer->ctx_mutex);
#endif
stemmer->enabled = g_getenv ("APPSTREAM_GLIB_DISABLE_STEMMER") == NULL;
stemmer->hash = g_hash_table_new_full (g_str_hash, g_str_equal,
(GDestroyNotify) as_ref_string_unref,
(GDestroyNotify) as_ref_string_unref);
}
/**
* as_stemmer_new:
*
* Creates a new #AsStemmer.
*
* Returns: (transfer full): a #AsStemmer
*
* Since: 0.2.2
**/
AsStemmer *
as_stemmer_new (void)
{
AsStemmer *stemmer = g_object_new (AS_TYPE_STEMMER, NULL);
return AS_STEMMER (stemmer);
}
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