/* vim:set et sts=4 sw=4:

 *

 * ibus - The Input Bus

 *

 * Copyright(c) 2011 Peng Huang <shawn.p.huang@gmail.com>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser 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

 */

Pango.AttrList get_pango_attr_list_from_ibus_text(IBus.Text text) {

    Pango.AttrList pango_attrs = new Pango.AttrList();

    unowned IBus.AttrList attrs = text.get_attributes();

    if (attrs == null)

        return pango_attrs;

    unowned string str = text.get_text();

    long nchars = str.char_count();

    long[] offsets = new long[nchars + 1];

    for (int i = 0; i <= nchars; i++)

        offsets[i] = str.index_of_nth_char(i);

    IBus.Attribute attr;

    int i = 0;

    while(true) {

        attr = attrs.get(i++);

        if (attr == null)

            break;

        long start_index =  attr.start_index;

        if (start_index <= 0) start_index = 0;

        start_index = start_index <= nchars ? offsets[start_index] : offsets[-1];

        long end_index = attr.end_index;

        if (end_index <= 0) end_index = 0;

        end_index = end_index <= nchars ? offsets[end_index] : offsets[-1];

        Pango.Attribute pango_attr = null;

        switch(attr.type) {

        case IBus.AttrType.FOREGROUND:

            {

                uint16 r = (uint16)((attr.value & 0x00ff0000) >> 8);

                uint16 g = (uint16)(attr.value & 0x0000ff00);

                uint16 b = (uint16)((attr.value & 0x000000ff) << 8);

                pango_attr = Pango.attr_foreground_new(r, g, b);

                break;

            }

        case IBus.AttrType.BACKGROUND:

            {

                uint16 r = (uint16)((attr.value & 0x00ff0000) >> 8);

                uint16 g = (uint16)(attr.value & 0x0000ff00);

                uint16 b = (uint16)((attr.value & 0x000000ff) << 8);

                pango_attr = Pango.attr_background_new(r, g, b);

                break;

            }

        case IBus.AttrType.UNDERLINE:

            {

                pango_attr = Pango.attr_underline_new((Pango.Underline)attr.value);

                break;

            }

        default:

            continue;

        }

        pango_attr.start_index = (uint)start_index;

        pango_attr.end_index = (uint)end_index;

        // Transfer the ownership to pango_attrs

        pango_attrs.insert((owned)pango_attr);

    }

    return pango_attrs;

}