decoder.cpp

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/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2013 Joel Holdsworth <joel@airwebreathe.org.uk>
 *
 * 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 St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <libsigrokdecode/libsigrokdecode.h>

#include "decoder.hpp"

#include <boost/none_t.hpp>

#include <pv/data/decoderstack.hpp>
#include <pv/data/decode/decoder.hpp>
#include <pv/prop/double.hpp>
#include <pv/prop/enum.hpp>
#include <pv/prop/int.hpp>
#include <pv/prop/string.hpp>

using boost::none;
using std::make_pair;
using std::map;
using std::pair;
using std::shared_ptr;
using std::string;
using std::vector;

using pv::prop::Double;
using pv::prop::Enum;
using pv::prop::Int;
using pv::prop::Property;
using pv::prop::String;

namespace pv {
namespace binding {

Decoder::Decoder(
    shared_ptr<pv::data::DecoderStack> decoder_stack,
    shared_ptr<data::decode::Decoder> decoder) :
    decoder_stack_(decoder_stack),
    decoder_(decoder)
{
    assert(decoder_);

    const srd_decoder *const dec = decoder_->decoder();
    assert(dec);

    for (GSList *l = dec->options; l; l = l->next) {
        const srd_decoder_option *const opt =
            (srd_decoder_option*)l->data;

        const QString name = QString::fromUtf8(opt->desc);

        const Property::Getter get = [&, opt]() {
            return getter(opt->id); };
        const Property::Setter set = [&, opt](Glib::VariantBase value) {
            setter(opt->id, value); };

        shared_ptr<Property> prop;

        if (opt->values)
            prop = bind_enum(name, opt, get, set);
        else if (g_variant_is_of_type(opt->def, G_VARIANT_TYPE("d")))
            prop = shared_ptr<Property>(new Double(name, 2, "",
                none, none, get, set));
        else if (g_variant_is_of_type(opt->def, G_VARIANT_TYPE("x")))
            prop = shared_ptr<Property>(
                new Int(name, "", none, get, set));
        else if (g_variant_is_of_type(opt->def, G_VARIANT_TYPE("s")))
            prop = shared_ptr<Property>(
                new String(name, get, set));
        else
            continue;

        properties_.push_back(prop);
    }
}

shared_ptr<Property> Decoder::bind_enum(
    const QString &name, const srd_decoder_option *option,
    Property::Getter getter, Property::Setter setter)
{
    vector< pair<Glib::VariantBase, QString> > values;
    for (GSList *l = option->values; l; l = l->next) {
        Glib::VariantBase var = Glib::VariantBase((GVariant*)l->data, true);
        values.push_back(make_pair(var, print_gvariant(var)));
    }

    return shared_ptr<Property>(new Enum(name, values, getter, setter));
}

Glib::VariantBase Decoder::getter(const char *id)
{
    GVariant *val = nullptr;

    assert(decoder_);

    // Get the value from the hash table if it is already present
    const map<string, GVariant*>& options = decoder_->options();
    const auto iter = options.find(id);

    if (iter != options.end())
        val = (*iter).second;
    else {
        assert(decoder_->decoder());

        // Get the default value if not
        for (GSList *l = decoder_->decoder()->options; l; l = l->next) {
            const srd_decoder_option *const opt =
                (srd_decoder_option*)l->data;
            if (strcmp(opt->id, id) == 0) {
                val = opt->def;
                break;
            }
        }
    }

    if (val)
        return Glib::VariantBase(val, true);
    else
        return Glib::VariantBase();
}

void Decoder::setter(const char *id, Glib::VariantBase value)
{
    assert(decoder_);
    decoder_->set_option(id, value.gobj());

    assert(decoder_stack_);
    decoder_stack_->begin_decode();
}

} // binding
} // pv