49 lines
2 KiB
C++
49 lines
2 KiB
C++
/*
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* Copyright (c) 2024, Steffen T. Larssen <dudedbz@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/String.h>
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#include <LibWeb/CSS/StyleValues/CSSMathValue.h>
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#include <LibWeb/CSS/StyleValues/NumberStyleValue.h>
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#include "RotationStyleValue.h"
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namespace Web::CSS {
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// https://www.w3.org/TR/2021/WD-css-transforms-2-20211109/#individual-transform-serialization
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String RotationStyleValue::to_string() const
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{
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auto resolve_to_number = [](ValueComparingNonnullRefPtr<CSSStyleValue const> const& value) -> Optional<double> {
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if (value->is_number())
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return value->as_number().number();
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if (value->is_math() && value->as_math().resolves_to_number())
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return value->as_math().resolve_number();
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VERIFY_NOT_REACHED();
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};
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auto x_value = resolve_to_number(m_properties.rotation_x).value_or(0);
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auto y_value = resolve_to_number(m_properties.rotation_y).value_or(0);
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auto z_value = resolve_to_number(m_properties.rotation_z).value_or(0);
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// If the axis is parallel with the x or y axes, it must serialize as the appropriate keyword.
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if (x_value > 0.0 && y_value == 0 && z_value == 0)
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return MUST(String::formatted("x {}", m_properties.angle->to_string()));
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if (x_value == 0 && y_value > 0.0 && z_value == 0)
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return MUST(String::formatted("y {}", m_properties.angle->to_string()));
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// If a rotation about the z axis (that is, in 2D) is specified, the property must serialize as just an <angle>.
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if (x_value == 0 && y_value == 0 && z_value > 0.0)
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return m_properties.angle->to_string();
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// It must serialize as the keyword none if and only if none was originally specified.
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// NOTE: This is handled by returning a keyword from the parser.
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// If any other rotation is specified, the property must serialize with an axis specified.
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return MUST(String::formatted("{} {} {} {}", m_properties.rotation_x->to_string(), m_properties.rotation_y->to_string(), m_properties.rotation_z->to_string(), m_properties.angle->to_string()));
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}
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}
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