/*

 * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#include <AK/CharacterTypes.h>

#include <AK/GenericLexer.h>

#include <AK/Optional.h>

#include <AK/StringView.h>

#include <LibWeb/SVG/ViewBox.h>

namespace Web::SVG {

Optional<ViewBox> try_parse_view_box(StringView string)

{

    // FIXME: This should handle all valid viewBox values.

    GenericLexer lexer(string);

    enum State {

        MinX,

        MinY,

        Width,

        Height,

    };

    int state { State::MinX };

    ViewBox view_box;

    while (!lexer.is_eof()) {

        lexer.consume_while([](auto ch) { return is_ascii_space(ch); });

        auto token = lexer.consume_until([](auto ch) { return is_ascii_space(ch) && ch != ','; });

        auto maybe_number = token.to_number<float>();

        if (!maybe_number.has_value())

            return {};

        switch (state) {

        case State::MinX:

            view_box.min_x = maybe_number.value();

            break;

        case State::MinY:

            view_box.min_y = maybe_number.value();

            break;

        case State::Width:

            view_box.width = maybe_number.value();

            break;

        case State::Height:

            view_box.height = maybe_number.value();

            break;

        default:

            return {};

        }

        state += 1;

    }

    return view_box;

}

}