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/*
 *  Copyright (C) 2003 Marco Pesenti Gritti
 *  Copyright (C) 2003 Christian Persch
 *
 *  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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 *  $Id$
 */

#include "config.h"

#include "ephy-encodings.h"
#include "ephy-node-db.h"
#include "ephy-file-helpers.h"
#include "eel-gconf-extensions.h"
#include "ephy-debug.h"

#include <glib/gi18n.h>
#include <string.h>

#define EPHY_ENCODINGS_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_ENCODINGS, EphyEncodingsPrivate))

struct _EphyEncodingsPrivate
{
    EphyNodeDb *db;
    EphyNode *root;
    EphyNode *encodings;
    EphyNode *detectors;
    GHashTable *hash;
    GSList *recent;
};

/**
 * translatable encodings titles
 * NOTE: if you add/remove/change encodings, please also update the schema in
 * epiphany.schemas.in
 */
static const 
struct
{
    char *title;
    char *code;
    EphyLanguageGroup groups;
    gboolean is_autodetector;
}
encoding_entries [] =
{ 
    { N_("Arabic (_IBM-864)"),                  "IBM864",                LG_ARABIC,     FALSE },
    { N_("Arabic (ISO-_8859-6)"),               "ISO-8859-6",            LG_ARABIC,     FALSE },
    { N_("Arabic (_MacArabic)"),                "x-mac-arabic",          LG_ARABIC,     FALSE },
    { N_("Arabic (_Windows-1256)"),             "windows-1256",          LG_ARABIC,     FALSE },
    { N_("Baltic (_ISO-8859-13)"),              "ISO-8859-13",           LG_BALTIC,     FALSE },
    { N_("Baltic (I_SO-8859-4)"),               "ISO-8859-4",            LG_BALTIC,     FALSE },
    { N_("Baltic (_Windows-1257)"),             "windows-1257",          LG_BALTIC,     FALSE },
    { N_("_Armenian (ARMSCII-8)"),              "armscii-8",             LG_CAUCASIAN,  FALSE },
    { N_("_Georgian (GEOSTD8)"),                "geostd8",               LG_CAUCASIAN,  FALSE },
    { N_("Central European (_IBM-852)"),        "IBM852",                LG_C_EUROPEAN, FALSE },
    { N_("Central European (I_SO-8859-2)"),     "ISO-8859-2",        LG_C_EUROPEAN, FALSE },
    { N_("Central European (_MacCE)"),          "x-mac-ce",              LG_C_EUROPEAN, FALSE },
    { N_("Central European (_Windows-1250)"),   "windows-1250",          LG_C_EUROPEAN, FALSE },
    { N_("Chinese Simplified (_GB18030)"),      "gb18030",               LG_CHINESE_SIMP,   FALSE },
    { N_("Chinese Simplified (G_B2312)"),       "GB2312",                LG_CHINESE_SIMP,   FALSE },
    { N_("Chinese Simplified (GB_K)"),          "x-gbk",                 LG_CHINESE_SIMP,   FALSE },
    { N_("Chinese Simplified (_HZ)"),           "HZ-GB-2312",        LG_CHINESE_SIMP,   FALSE },
    { N_("Chinese Simplified (_ISO-2022-CN)"),  "ISO-2022-CN",           LG_CHINESE_SIMP,   FALSE },
    { N_("Chinese Traditional (Big_5)"),        "Big5",                  LG_CHINESE_TRAD,   FALSE },
    { N_("Chinese Traditional (Big5-HK_SCS)"),  "Big5-HKSCS",        LG_CHINESE_TRAD,   FALSE },
    { N_("Chinese Traditional (_EUC-TW)"),      "x-euc-tw",              LG_CHINESE_TRAD,   FALSE },
    { N_("Cyrillic (_IBM-855)"),                "IBM855",                LG_CYRILLIC,   FALSE },
    { N_("Cyrillic (I_SO-8859-5)"),             "ISO-8859-5",        LG_CYRILLIC,   FALSE },
    { N_("Cyrillic (IS_O-IR-111)"),             "ISO-IR-111",        LG_CYRILLIC,   FALSE },
    { N_("Cyrillic (_KOI8-R)"),                 "KOI8-R",                LG_CYRILLIC,   FALSE },
    { N_("Cyrillic (_MacCyrillic)"),            "x-mac-cyrillic",        LG_CYRILLIC,   FALSE },
    { N_("Cyrillic (_Windows-1251)"),           "windows-1251",          LG_CYRILLIC,   FALSE },
    { N_("Cyrillic/_Russian (IBM-866)"),        "IBM866",                LG_CYRILLIC,   FALSE },
    { N_("Greek (_ISO-8859-7)"),                "ISO-8859-7",            LG_GREEK,      FALSE },
    { N_("Greek (_MacGreek)"),                  "x-mac-greek",           LG_GREEK,      FALSE },
    { N_("Greek (_Windows-1253)"),              "windows-1253",          LG_GREEK,      FALSE },
    { N_("Gujarati (_MacGujarati)"),            "x-mac-gujarati",        LG_INDIAN,     FALSE },
    { N_("Gurmukhi (Mac_Gurmukhi)"),            "x-mac-gurmukhi",        LG_INDIAN,     FALSE },
    { N_("Hindi (Mac_Devanagari)"),             "x-mac-devanagari",      LG_INDIAN,     FALSE },
    { N_("Hebrew (_IBM-862)"),                  "IBM862",                LG_HEBREW,     FALSE },
    { N_("Hebrew (IS_O-8859-8-I)"),             "ISO-8859-8-I",          LG_HEBREW,     FALSE },
    { N_("Hebrew (_MacHebrew)"),                "x-mac-hebrew",          LG_HEBREW,     FALSE },
    { N_("Hebrew (_Windows-1255)"),             "windows-1255",          LG_HEBREW,     FALSE },
    { N_("_Visual Hebrew (ISO-8859-8)"),        "ISO-8859-8",            LG_HEBREW,     FALSE },
    { N_("Japanese (_EUC-JP)"),                 "EUC-JP",                LG_JAPANESE,   FALSE },
    { N_("Japanese (_ISO-2022-JP)"),            "ISO-2022-JP",           LG_JAPANESE,   FALSE },
    { N_("Japanese (_Shift-JIS)"),              "Shift_JIS",             LG_JAPANESE,   FALSE },
    { N_("Korean (_EUC-KR)"),                   "EUC-KR",                LG_KOREAN,     FALSE },
    { N_("Korean (_ISO-2022-KR)"),              "ISO-2022-KR",           LG_KOREAN,     FALSE },
    { N_("Korean (_JOHAB)"),                    "x-johab",               LG_KOREAN,     FALSE },
    { N_("Korean (_UHC)"),                      "x-windows-949",         LG_KOREAN,     FALSE },
    { N_("_Celtic (ISO-8859-14)"),              "ISO-8859-14",           LG_NORDIC,     FALSE },
    { N_("_Icelandic (MacIcelandic)"),          "x-mac-icelandic",       LG_NORDIC,     FALSE },
    { N_("_Nordic (ISO-8859-10)"),              "ISO-8859-10",           LG_NORDIC,     FALSE },
    { N_("_Persian (MacFarsi)"),                "x-mac-farsi",           LG_PERSIAN,    FALSE },
    { N_("Croatian (Mac_Croatian)"),            "x-mac-croatian",        LG_SE_EUROPEAN,    FALSE },
    { N_("_Romanian (MacRomanian)"),            "x-mac-romanian",        LG_SE_EUROPEAN,    FALSE },
    { N_("R_omanian (ISO-8859-16)"),            "ISO-8859-16",           LG_SE_EUROPEAN,    FALSE },
    { N_("South _European (ISO-8859-3)"),       "ISO-8859-3",            LG_SE_EUROPEAN,    FALSE },
    { N_("Thai (TIS-_620)"),                    "TIS-620",               LG_THAI,       FALSE },
    { N_("Thai (IS_O-8859-11)"),                "iso-8859-11",           LG_THAI,       FALSE },
    { N_("_Thai (Windows-874)"),                "windows-874",           LG_THAI,       FALSE },
    { N_("Turkish (_IBM-857)"),                 "IBM857",                LG_TURKISH,    FALSE },
    { N_("Turkish (I_SO-8859-9)"),              "ISO-8859-9",            LG_TURKISH,    FALSE },
    { N_("Turkish (_MacTurkish)"),              "x-mac-turkish",         LG_TURKISH,    FALSE },
    { N_("Turkish (_Windows-1254)"),            "windows-1254",          LG_TURKISH,    FALSE },
    { N_("Unicode (UTF-_8)"),                   "UTF-8",                 LG_UNICODE,    FALSE },
    { N_("Cyrillic/Ukrainian (_KOI8-U)"),       "KOI8-U",                LG_UKRAINIAN,  FALSE },
    { N_("Cyrillic/Ukrainian (Mac_Ukrainian)"), "x-mac-ukrainian",       LG_UKRAINIAN,  FALSE },
    { N_("Vietnamese (_TCVN)"),                 "x-viet-tcvn5712",       LG_VIETNAMESE, FALSE },
    { N_("Vietnamese (_VISCII)"),               "VISCII",                LG_VIETNAMESE, FALSE },
    { N_("Vietnamese (V_PS)"),                  "x-viet-vps",            LG_VIETNAMESE, FALSE },
    { N_("Vietnamese (_Windows-1258)"),         "windows-1258",          LG_VIETNAMESE, FALSE },
    { N_("Western (_IBM-850)"),                 "IBM850",                LG_WESTERN,    FALSE },
    { N_("Western (_ISO-8859-1)"),              "ISO-8859-1",            LG_WESTERN,    FALSE },
    { N_("Western (IS_O-8859-15)"),             "ISO-8859-15",           LG_WESTERN,    FALSE },
    { N_("Western (_MacRoman)"),                "x-mac-roman",           LG_WESTERN,    FALSE },
    { N_("Western (_Windows-1252)"),            "windows-1252",          LG_WESTERN,    FALSE },

    /* the following encodings are so rarely used that we don't want to pollute the "related"
     * part of the encodings menu with them, so we set the language group to 0 here
     */
    { N_("English (_US-ASCII)"),                "us-ascii",              0,         FALSE },
    { N_("Unicode (UTF-_16 BE)"),               "UTF-16BE",              0,         FALSE },
    { N_("Unicode (UTF-1_6 LE)"),               "UTF-16LE",              0,         FALSE },
    { N_("Unicode (UTF-_32 BE)"),               "UTF-32BE",              0,         FALSE },
    { N_("Unicode (UTF-3_2 LE)"),               "UTF-32LE",              0,         FALSE },

    /* Translators: The text before the "|" is context to help you decide on
     * the correct translation. You MUST OMIT it in the translated string. */
    { N_("autodetectors|Off"),                          "",                LG_NONE,                             TRUE },
    /* Translators: The text before the "|" is context to help you decide on
     * the correct translation. You MUST OMIT it in the translated string. */
    { N_("automatically detect ... character encodings|Chinese"),           "zh_parallel_state_machine",   LG_CHINESE_TRAD | LG_CHINESE_SIMP,                   TRUE },
    /* Translators: The text before the "|" is context to help you decide on
     * the correct translation. You MUST OMIT it in the translated string. */
    { N_("automatically detect ... character encodings|Simplified Chinese"),    "zhcn_parallel_state_machine", LG_CHINESE_SIMP,                         TRUE },
    /* Translators: The text before the "|" is context to help you decide on
     * the correct translation. You MUST OMIT it in the translated string. */
    { N_("automatically detect ... character encodings|Traditional Chinese"),   "zhtw_parallel_state_machine", LG_CHINESE_TRAD,                         TRUE },
    /* Translators: The text before the "|" is context to help you decide on
     * the correct translation. You MUST OMIT it in the translated string. */
    { N_("automatically detect ... character encodings|East Asian"),        "cjk_parallel_state_machine",  LG_CHINESE_TRAD | LG_CHINESE_SIMP | LG_JAPANESE | LG_KOREAN,     TRUE },
    /* Translators: The text before the "|" is context to help you decide on
     * the correct translation. You MUST OMIT it in the translated string. */
    { N_("automatically detect ... character encodings|Japanese"),          "ja_parallel_state_machine",   LG_JAPANESE,                             TRUE },
    /* Translators: The text before the "|" is context to help you decide on
     * the correct translation. You MUST OMIT it in the translated string. */
    { N_("automatically detect ... character encodings|Korean"),            "ko_parallel_state_machine",   LG_KOREAN,                               TRUE },
    /* Translators: The text before the "|" is context to help you decide on
     * the correct translation. You MUST OMIT it in the translated string. */
    { N_("automatically detect ... character encodings|Russian"),           "ruprob",              LG_CYRILLIC | LG_UKRAINIAN,                      TRUE },
    /* Translators: The text before the "|" is context to help you decide on
     * the correct translation. You MUST OMIT it in the translated string. */
    { N_("automatically detect ... character encodings|Universal"),         "universal_charset_detector",  LG_ALL,                              TRUE },
    /* Translators: The text before the "|" is context to help you decide on
     * the correct translation. You MUST OMIT it in the translated string. */
    { N_("automatically detect ... character encodings|Ukrainian"),         "ukprob",              LG_UKRAINIAN,                            TRUE }
};
static const guint n_encoding_entries = G_N_ELEMENTS (encoding_entries);

enum
{
    ALL_NODE_ID = 2,
    ENCODINGS_NODE_ID = 3,
    DETECTORS_NODE_ID = 5
};

#define RECENT_KEY  "/apps/epiphany/general/recent_encodings"
#define RECENT_MAX  4

static void ephy_encodings_class_init   (EphyEncodingsClass *klass);
static void ephy_encodings_init     (EphyEncodings *ma);

static GObjectClass *parent_class = NULL;

GType
ephy_encodings_get_type (void)
{
    static GType type = 0;

    if (G_UNLIKELY (type == 0))
    {
        static const GTypeInfo our_info =
        {
            sizeof (EphyEncodingsClass),
            NULL,
            NULL,
            (GClassInitFunc) ephy_encodings_class_init,
            NULL,
            NULL,
            sizeof (EphyEncodings),
            0,
            (GInstanceInitFunc) ephy_encodings_init
        };

        type = g_type_register_static (G_TYPE_OBJECT,
                           "EphyEncodings",
                            &our_info, 0);
    }

    return type;
}

static void
ephy_encodings_finalize (GObject *object)
{
    EphyEncodings *encodings = EPHY_ENCODINGS (object);

    g_hash_table_destroy (encodings->priv->hash);

    ephy_node_unref (encodings->priv->encodings);
    ephy_node_unref (encodings->priv->detectors);
    ephy_node_unref (encodings->priv->root);

    g_slist_foreach (encodings->priv->recent, (GFunc) g_free, NULL);
    g_slist_free (encodings->priv->recent);

    g_object_unref (encodings->priv->db);

    LOG ("EphyEncodings finalised")

    G_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
ephy_encodings_class_init (EphyEncodingsClass *klass)
{
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    parent_class = g_type_class_peek_parent (klass);

    object_class->finalize = ephy_encodings_finalize;

    g_type_class_add_private (object_class, sizeof (EphyEncodingsPrivate));
}

/* copied from egg-toolbar-editor.c */
static char *
elide_underscores (const char *original)
{
    char *q, *result;
    const char *p;
    gboolean last_underscore;

    q = result = g_malloc (strlen (original) + 1);
    last_underscore = FALSE;

    for (p = original; *p; p++)
    {
        if (!last_underscore && *p == '_')
        {
            last_underscore = TRUE;
        }
        else
        {
            last_underscore = FALSE;
            *q++ = *p;
        }
    }

    *q = '\0';

    return result;
}

static EphyNode *
add_encoding (EphyEncodings *encodings,
          const char *title,
          const char *code,
          EphyLanguageGroup groups,
          gboolean is_autodetector)
{
    EphyNode *node;
    char *elided, *normalised;
    GValue value = { 0, };

    node = ephy_node_new (encodings->priv->db);

    g_value_init (&value, G_TYPE_STRING);
    g_value_set_string (&value, title);
    ephy_node_set_property (node, EPHY_NODE_ENCODING_PROP_TITLE, &value);
    g_value_unset (&value);

    elided = elide_underscores (title);
    normalised = g_utf8_normalize (elided, -1, G_NORMALIZE_DEFAULT);

    g_value_init (&value, G_TYPE_STRING);
    g_value_take_string (&value, g_utf8_collate_key (normalised, -1));
    ephy_node_set_property (node, EPHY_NODE_ENCODING_PROP_COLLATION_KEY, &value);
    g_value_unset (&value);

    g_free (normalised);

    g_value_init (&value, G_TYPE_STRING);
    g_value_take_string (&value, elided);
    ephy_node_set_property (node, EPHY_NODE_ENCODING_PROP_TITLE_ELIDED, &value);
    g_value_unset (&value);

    g_value_init (&value, G_TYPE_STRING);
    g_value_set_string (&value, code);
    ephy_node_set_property (node, EPHY_NODE_ENCODING_PROP_ENCODING, &value);
    g_value_unset (&value);

    g_value_init (&value, G_TYPE_INT);
    g_value_set_int (&value, groups);
    ephy_node_set_property (node, EPHY_NODE_ENCODING_PROP_LANGUAGE_GROUPS, &value);
    g_value_unset (&value);

    g_value_init (&value, G_TYPE_BOOLEAN);
    g_value_set_boolean (&value, is_autodetector);
    ephy_node_set_property (node, EPHY_NODE_ENCODING_PROP_IS_AUTODETECTOR, &value);
    g_value_unset (&value);

    /* now insert the node in our structure */
    ephy_node_add_child (encodings->priv->root, node);
    g_hash_table_insert (encodings->priv->hash, g_strdup (code), node);

    if (is_autodetector)
    {
        ephy_node_add_child (encodings->priv->detectors, node);
    }
    else
    {
        ephy_node_add_child (encodings->priv->encodings, node);
    }

    return node;
}

EphyNode *
ephy_encodings_get_node (EphyEncodings *encodings,
             const char *code,
             gboolean add_if_not_found)
{
    EphyNode *node;

    g_return_val_if_fail (EPHY_IS_ENCODINGS (encodings), NULL);

    node = g_hash_table_lookup (encodings->priv->hash, code);

    /* if it doesn't exist, add a node for it */
    if (!EPHY_IS_NODE (node) && add_if_not_found)
    {
        char *title;

        /* translators: this is the title that an unknown encoding will
         * be displayed as.
         */
        title = g_strdup_printf (_("Unknown (%s)"), code);
        node = add_encoding (encodings, title, code, 0, FALSE);
        g_free (title);
    }

    return node;
}

GList *
ephy_encodings_get_encodings (EphyEncodings *encodings,
                  EphyLanguageGroup group_mask)
{
    GList *list = NULL;
    GPtrArray *children;
    int i, n_items;

    children = ephy_node_get_children (encodings->priv->encodings);
    n_items = children->len;
    for (i = 0; i < n_items; i++)
    {
        EphyNode *kid;
        EphyLanguageGroup group;
                                                                 
        kid = g_ptr_array_index (children, i);
        group = ephy_node_get_property_int
            (kid, EPHY_NODE_ENCODING_PROP_LANGUAGE_GROUPS);
                                                                  
        if ((group & group_mask) != 0)
        {
            list = g_list_prepend (list, kid);
        }
    }

    return list;
}

EphyNode *
ephy_encodings_get_detectors (EphyEncodings *encodings)
{
    g_return_val_if_fail (EPHY_IS_ENCODINGS (encodings), NULL);

    return encodings->priv->detectors;
}

EphyNode *
ephy_encodings_get_all (EphyEncodings *encodings)
{
    g_return_val_if_fail (EPHY_IS_ENCODINGS (encodings), NULL);

    return encodings->priv->encodings;
}

void
ephy_encodings_add_recent (EphyEncodings *encodings,
               const char *code)
{
    GSList *element;

    g_return_if_fail (EPHY_IS_ENCODINGS (encodings));
    g_return_if_fail (code != NULL);
    
    if (ephy_encodings_get_node (encodings, code, FALSE) == NULL) return;

    /* keep the list elements unique */
    element = g_slist_find_custom (encodings->priv->recent, code,
                       (GCompareFunc) strcmp);
    if (element != NULL)
    {
        g_free (element->data);
        encodings->priv->recent =
            g_slist_remove_link (encodings->priv->recent, element);
    }

    /* add the new code upfront */
    encodings->priv->recent =
        g_slist_prepend (encodings->priv->recent, g_strdup (code));

    /* truncate the list if necessary; it's at most 1 element too much */
    if (g_slist_length (encodings->priv->recent) > RECENT_MAX)
    {
        GSList *tail;

        tail = g_slist_last (encodings->priv->recent);
        g_free (tail->data);
        encodings->priv->recent =
            g_slist_remove_link (encodings->priv->recent, tail);
    }

    /* persist the list */
    eel_gconf_set_string_list (RECENT_KEY, encodings->priv->recent);
}

GList *
ephy_encodings_get_recent (EphyEncodings *encodings)
{
    GSList *l;
    GList *list = NULL;

    for (l = encodings->priv->recent; l != NULL; l = l->next)
    {
        EphyNode *node;

        node = ephy_encodings_get_node (encodings, (char *) l->data, FALSE);
        g_return_val_if_fail (EPHY_IS_NODE (node), NULL);

        list = g_list_prepend (list, node);
    }

    return list;
}

static void
ephy_encodings_init (EphyEncodings *encodings)
{
    EphyNodeDb *db;
    GSList *list, *l;
    guint i;

    encodings->priv = EPHY_ENCODINGS_GET_PRIVATE (encodings);

    LOG ("EphyEncodings initialising")

    db = ephy_node_db_new ("EncodingsDB");
    encodings->priv->db = db;

    encodings->priv->hash = g_hash_table_new_full (g_str_hash, g_str_equal,
                               (GDestroyNotify) g_free,
                               NULL);

    encodings->priv->root = ephy_node_new_with_id (db, ALL_NODE_ID);
    encodings->priv->encodings = ephy_node_new_with_id (db, ENCODINGS_NODE_ID);
    encodings->priv->detectors = ephy_node_new_with_id (db, DETECTORS_NODE_ID);

    /* now fill the db */
    for (i = 0; i < n_encoding_entries; i++)
    {
        add_encoding (encodings,
                  encoding_entries[i].is_autodetector
                    ? Q_(encoding_entries[i].title)
                : _(encoding_entries[i].title),
                  encoding_entries[i].code,
                  encoding_entries[i].groups,
                  encoding_entries[i].is_autodetector);
    }

    /* get the list of recently used encodings */
    list = eel_gconf_get_string_list (RECENT_KEY);

    /* make sure the list has no duplicates (GtkUIManager goes
     * crazy otherwise), and only valid entries
     */
    encodings->priv->recent = NULL;
    for (l = list; l != NULL; l = l->next)
    {
        if (g_slist_find (encodings->priv->recent, l->data) == NULL
            && g_slist_length (encodings->priv->recent) < RECENT_MAX
            && ephy_encodings_get_node (encodings, l->data, FALSE) != NULL)
        {
            encodings->priv->recent =
                g_slist_prepend (encodings->priv->recent,
                         l->data);
        }
        else
        {
            g_free (l->data);
        }
    }
    encodings->priv->recent = g_slist_reverse (encodings->priv->recent);
    g_slist_free (list);
}

EphyEncodings *
ephy_encodings_new (void)
{
    return g_object_new (EPHY_TYPE_ENCODINGS, NULL);
}