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e2e7c4d574
In a bunch of cases, this actually ends up simplifying the code as
to_number will handle something such as:
```
Optional<I> opt;
if constexpr (IsSigned<I>)
opt = view.to_int<I>();
else
opt = view.to_uint<I>();
```
For us.
The main goal here however is to have a single generic number conversion
API between all of the String classes.
59 lines
1.4 KiB
C++
59 lines
1.4 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/CharacterTypes.h>
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#include <AK/GenericLexer.h>
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#include <AK/Optional.h>
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#include <AK/StringView.h>
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#include <LibWeb/SVG/ViewBox.h>
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namespace Web::SVG {
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Optional<ViewBox> try_parse_view_box(StringView string)
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{
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// FIXME: This should handle all valid viewBox values.
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GenericLexer lexer(string);
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enum State {
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MinX,
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MinY,
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Width,
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Height,
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};
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int state { State::MinX };
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ViewBox view_box;
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while (!lexer.is_eof()) {
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lexer.consume_while([](auto ch) { return is_ascii_space(ch); });
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auto token = lexer.consume_until([](auto ch) { return is_ascii_space(ch) && ch != ','; });
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auto maybe_number = token.to_number<float>();
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if (!maybe_number.has_value())
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return {};
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switch (state) {
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case State::MinX:
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view_box.min_x = maybe_number.value();
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break;
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case State::MinY:
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view_box.min_y = maybe_number.value();
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break;
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case State::Width:
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view_box.width = maybe_number.value();
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break;
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case State::Height:
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view_box.height = maybe_number.value();
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break;
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default:
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return {};
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}
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state += 1;
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}
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return view_box;
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}
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}
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