jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <AK/CharacterTypes.h>
8#include <AK/GenericLexer.h>
9#include <AK/Optional.h>
10#include <AK/StringView.h>
11#include <LibWeb/SVG/ViewBox.h>
12
13namespace Web::SVG {
14
15Optional<ViewBox> try_parse_view_box(StringView string)
16{
17 // FIXME: This should handle all valid viewBox values.
18
19 GenericLexer lexer(string);
20
21 enum State {
22 MinX,
23 MinY,
24 Width,
25 Height,
26 };
27 int state { State::MinX };
28 ViewBox view_box;
29
30 while (!lexer.is_eof()) {
31 lexer.consume_while([](auto ch) { return is_ascii_space(ch); });
32 auto token = lexer.consume_until([](auto ch) { return is_ascii_space(ch) && ch != ','; });
33 auto maybe_number = token.to_int();
34 if (!maybe_number.has_value())
35 return {};
36 switch (state) {
37 case State::MinX:
38 view_box.min_x = maybe_number.value();
39 break;
40 case State::MinY:
41 view_box.min_y = maybe_number.value();
42 break;
43 case State::Width:
44 view_box.width = maybe_number.value();
45 break;
46 case State::Height:
47 view_box.height = maybe_number.value();
48 break;
49 default:
50 return {};
51 }
52 state += 1;
53 }
54
55 return view_box;
56}
57
58}