path: root/widgets/text/e-text-model-uri.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* 
 * e-text-model-uri.c - a text model w/ clickable URIs
 * Copyright 2000, 2001, Ximian, Inc.
 *
 * Authors:
 *   Jon Trowbridge <trow@ximian.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License, version 2, as published by the Free Software Foundation.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#include <config.h>

#include <ctype.h>
#include <sys/types.h>
#include <regex.h>

#include <gtk/gtkmain.h>
#include <libgnome/gnome-url.h>

#include "e-util/e-util.h"

#include "e-text-model-uri.h"

static void e_text_model_uri_class_init (ETextModelURIClass *class);
static void e_text_model_uri_init (ETextModelURI *model);
static void e_text_model_uri_dispose (GObject *object);

static void objectify_uris (ETextModelURI *model);

static void e_text_model_uri_objectify (ETextModel *model);
static gint e_text_model_uri_validate_pos (ETextModel *model, gint pos);
static gint e_text_model_uri_get_obj_count (ETextModel *model);
static const gchar *e_text_model_uri_get_nth_object (ETextModel *model, gint i, gint *len);
static void e_text_model_uri_activate_nth_object (ETextModel *model, gint);

typedef struct _ObjInfo ObjInfo;
struct _ObjInfo {
    gint offset, len;
};

G_DEFINE_TYPE (ETextModelURI, e_text_model_uri, E_TYPE_TEXT_MODEL)
         
static void
e_text_model_uri_class_init (ETextModelURIClass *klass)
{
    GObjectClass *object_class;
    ETextModelClass *model_class;

    object_class = (GObjectClass *) klass;
    model_class = E_TEXT_MODEL_CLASS (klass);

    object_class->dispose = e_text_model_uri_dispose;

    model_class->object_activated = e_text_model_uri_activate_nth_object;

    model_class->objectify = e_text_model_uri_objectify;
    model_class->validate_pos = e_text_model_uri_validate_pos;
    model_class->obj_count = e_text_model_uri_get_obj_count;
    model_class->get_nth_obj = e_text_model_uri_get_nth_object;

}

static void
e_text_model_uri_init (ETextModelURI *model)
{

}

static void
e_text_model_uri_dispose (GObject *object)
{
    ETextModelURI *model_uri = E_TEXT_MODEL_URI (object);
    GList *iter;

    if (model_uri->objectify_idle) {
        g_source_remove (model_uri->objectify_idle);
        model_uri->objectify_idle = 0;
    }

    for (iter = model_uri->uris; iter != NULL; iter = g_list_next (iter))
        g_free (iter->data);
    g_list_free (model_uri->uris);
    model_uri->uris = NULL;

    if (G_OBJECT_CLASS (e_text_model_uri_parent_class)->dispose)
        (* G_OBJECT_CLASS (e_text_model_uri_parent_class)->dispose) (object);

}

static const gchar *uri_regex[] = {
    "(((news|telnet|nttp|file|http|ftp|https)://)|(www|ftp))[-A-Za-z0-9\\.]+(:[0-9]*)?/[-A-Za-z0-9_\\$\\.\\+\\!\\*\\(\\),;:@&=\\?/~\\#\\%]*[^]'\\.}>\\) ,\\\"]",
        "(((news|telnet|nttp|file|http|ftp|https)://)|(www|ftp))[-A-Za-z0-9\\.]+[-A-Za-z0-9](:[0-9]*)?",
        "mailto:[A-Za-z0-9_]+@[-A-Za-z0-9_]+\\.[-A-Za-z0-9\\.]+[-A-Za-z0-9]",
    NULL
};
static gint regex_count = 0;
static regex_t *regex_compiled = NULL;

static void
regex_init (void)
{
    gint i;

    if (regex_count != 0)
        return;

    while (uri_regex[regex_count]) ++regex_count;

    regex_compiled = g_new0 (regex_t, regex_count);
    
    for (i=0; i<regex_count; ++i) {
        if (regcomp (&regex_compiled[i], uri_regex[i], REG_EXTENDED))
            g_error ("Bad regex?: %s", uri_regex[i]);
    }
}


static void
objectify_uris (ETextModelURI *model_uri)
{
    static gboolean objectifying = FALSE;

    ETextModel *model = E_TEXT_MODEL (model_uri);
    const gchar *txt;
    GList *iter, *old_uris;
    gint offset, len;
    gboolean found_match;
    regmatch_t match;
    gboolean changed;

    if (objectifying)
        return;

    objectifying = TRUE;

    if (regex_count == 0)
        regex_init ();

    txt = e_text_model_get_text (model);
    len  = e_text_model_get_text_length (model);

    old_uris = model_uri->uris;
    model_uri->uris = NULL;

    if (txt) {
        offset = 0;
        found_match = TRUE;

        while (offset < len && found_match) {
            
            gint i, so=-1, eo=-1;

            found_match = FALSE;
            
            for (i=0; i<regex_count; ++i) {
                
                if (regexec (&regex_compiled[i], txt+offset, 1, &match, 0) == 0) {

                    /* Take earliest match possible.  In case of a tie, take the
                       largest possible match. */
                    if (!found_match
                        || match.rm_so < so
                        || (match.rm_so == so && match.rm_eo > eo)) {
                        so = match.rm_so;
                        eo = match.rm_eo;
                    }
                    found_match = TRUE;
                }
            }
            
            if (found_match) {
                
                ObjInfo *info = g_new0 (ObjInfo, 1);
                info->offset = offset + so;
                info->len = eo - so;

                model_uri->uris = g_list_append (model_uri->uris, info);
                
                offset += eo;
            }
        }
    }

    changed = (g_list_length (old_uris) != g_list_length (model_uri->uris));

    if (!changed) {
        /* Check that there is a 1-1 correspondence between object positions. */
        GList *jter;

        for (iter = model_uri->uris; iter != NULL && !changed; iter = g_list_next (iter)) {
            ObjInfo *info = (ObjInfo *) iter->data;
            found_match = FALSE;
            for (jter = old_uris; jter != NULL && !found_match; jter = g_list_next (jter)) {
                ObjInfo *jnfo = (ObjInfo *) jter->data;

                if (info->offset == jnfo->offset && info->len == jnfo->len)
                    found_match = TRUE;
            }
            changed = !found_match;
        }
    }

    if (changed)
        e_text_model_changed (model);

    /* Free old uris */
    for (iter = old_uris; iter != NULL; iter = g_list_next (iter))
        g_free (iter->data);
    g_list_free (old_uris);

    objectifying = FALSE;
}

static gboolean
objectify_idle_cb (gpointer ptr)
{
    ETextModelURI *model_uri = E_TEXT_MODEL_URI (ptr);

    g_return_val_if_fail (model_uri->objectify_idle, FALSE);
    objectify_uris (model_uri);
    model_uri->objectify_idle = 0;

    return FALSE;
}

static void
e_text_model_uri_objectify (ETextModel *model)
{
    ETextModelURI *model_uri = E_TEXT_MODEL_URI (model);

    if (model_uri->objectify_idle == 0)
        model_uri->objectify_idle = g_idle_add (objectify_idle_cb, model);

    if (E_TEXT_MODEL_CLASS(e_text_model_uri_parent_class)->objectify)
        E_TEXT_MODEL_CLASS(e_text_model_uri_parent_class)->objectify (model);
}

static void
objectify_idle_flush (ETextModelURI *model_uri)
{
    if (model_uri->objectify_idle) {
        g_source_remove (model_uri->objectify_idle);
        model_uri->objectify_idle = 0;
        objectify_uris (model_uri);
    }
}

static gint
e_text_model_uri_validate_pos (ETextModel *model, gint pos)
{
    gint obj_num;

    /* Cause us to skip over objects */

    obj_num = e_text_model_get_object_at_offset (model, pos);
    if (obj_num != -1) {
        gint pos0, pos1, mp;
        e_text_model_get_nth_object_bounds (model, obj_num, &pos0, &pos1);
        mp = (pos0 + pos1)/2;
        if (pos0 < pos && pos < mp)
            pos = pos1;
        else if (mp <= pos && pos < pos1)
            pos = pos0;
    }

    

    if (E_TEXT_MODEL_CLASS (e_text_model_uri_parent_class)->validate_pos)
        pos = E_TEXT_MODEL_CLASS (e_text_model_uri_parent_class)->validate_pos (model, pos);

    return pos;
}

static gint
e_text_model_uri_get_obj_count (ETextModel *model)
{
    ETextModelURI *model_uri = E_TEXT_MODEL_URI (model);

    objectify_idle_flush (model_uri);

    return g_list_length (model_uri->uris);
}

static const gchar *
e_text_model_uri_get_nth_object (ETextModel *model, gint i, gint *len)
{
    ETextModelURI *model_uri = E_TEXT_MODEL_URI (model);
    ObjInfo *info;
    const gchar *txt;

    objectify_idle_flush (model_uri);
    
    txt = e_text_model_get_text (model);

    info = (ObjInfo *) g_list_nth_data (model_uri->uris, i);
    g_return_val_if_fail (info != NULL, NULL);


    if (len)
        *len = info->len;
    return txt + info->offset;
}

static void
e_text_model_uri_activate_nth_object (ETextModel *model, gint i)
{
    gchar *obj_str;

    objectify_idle_flush (E_TEXT_MODEL_URI (model));
    
    obj_str = e_text_model_strdup_nth_object (model, i);
    gnome_url_show (obj_str, NULL);
    g_free (obj_str);
}

ETextModel *
e_text_model_uri_new (void)
{
    return E_TEXT_MODEL (g_object_new (E_TYPE_TEXT_MODEL_URI, NULL));
}


/* $Id$ */