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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/String.h>
#include <LibWeb/Forward.h>
namespace Web::CSS {
class Length {
public:
enum class Type {
Undefined,
Percentage,
Auto,
Px,
Pt,
Em,
Rem,
};
Length() { }
Length(int value, Type type)
: m_type(type)
, m_value(value)
{
}
Length(float value, Type type)
: m_type(type)
, m_value(value)
{
}
static Length make_auto() { return Length(0, Type::Auto); }
static Length make_px(float value) { return Length(value, Type::Px); }
Length resolved(const Length& fallback_for_undefined, const LayoutNode& layout_node, float reference_for_percent) const
{
if (is_undefined())
return fallback_for_undefined;
if (is_percentage())
return make_px(raw_value() / 100.0 * reference_for_percent);
if (is_relative())
return make_px(to_px(layout_node));
return *this;
}
Length resolved_or_auto(const LayoutNode& layout_node, float reference_for_percent) const
{
return resolved(make_auto(), layout_node, reference_for_percent);
}
Length resolved_or_zero(const LayoutNode& layout_node, float reference_for_percent) const
{
return resolved(make_px(0), layout_node, reference_for_percent);
}
bool is_undefined_or_auto() const { return m_type == Type::Undefined || m_type == Type::Auto; }
bool is_undefined() const { return m_type == Type::Undefined; }
bool is_percentage() const { return m_type == Type::Percentage; }
bool is_auto() const { return m_type == Type::Auto; }
bool is_absolute() const { return m_type == Type::Px || m_type == Type::Pt; }
bool is_relative() const { return m_type == Type::Em || m_type == Type::Rem; }
float raw_value() const { return m_value; }
ALWAYS_INLINE float to_px(const LayoutNode& layout_node) const
{
if (is_relative())
return relative_length_to_px(layout_node);
switch (m_type) {
case Type::Auto:
return 0;
case Type::Px:
return m_value;
case Type::Pt:
return m_value * 1.33333333f;
case Type::Undefined:
case Type::Percentage:
default:
ASSERT_NOT_REACHED();
}
}
String to_string() const
{
if (is_auto())
return "[auto]";
return String::format("[%g %s]", m_value, unit_name());
}
private:
float relative_length_to_px(const LayoutNode&) const;
const char* unit_name() const;
Type m_type { Type::Undefined };
float m_value { 0 };
};
inline const LogStream& operator<<(const LogStream& stream, const Length& value)
{
return stream << value.to_string();
}
}
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