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LibWeb: Implement CSS Frequency class

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This corresponds to `<frequency>` in the grammar.
This commit is contained in:
Sam Atkins 2022-02-21 17:49:47 +00:00 • committed by Andreas Kling
parent 355d1936f2
commit bd79c303f6
9 changed files with 267 additions and 5 deletions
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86
Userland/Libraries/LibWeb/CSS/Frequency.cpp Normal file
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/*
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Frequency.h"
#include <LibWeb/CSS/StyleValue.h>
namespace Web::CSS {
Frequency::Frequency(int value, Type type)
: m_type(type)
, m_value(value)
{
}
Frequency::Frequency(float value, Type type)
: m_type(type)
, m_value(value)
{
}
Frequency Frequency::make_calculated(NonnullRefPtr<CalculatedStyleValue> calculated_style_value)
{
Frequency frequency { 0, Type::Calculated };
frequency.m_calculated_style = move(calculated_style_value);
return frequency;
}
Frequency Frequency::make_hertz(float value)
{
return { value, Type::Hz };
}
Frequency Frequency::percentage_of(Percentage const& percentage) const
{
VERIFY(!is_calculated());
return Frequency { percentage.as_fraction() * m_value, m_type };
}
String Frequency::to_string() const
{
if (is_calculated())
return m_calculated_style->to_string();
return String::formatted("{}{}", m_value, unit_name());
}
float Frequency::to_hertz() const
{
switch (m_type) {
case Type::Calculated:
return m_calculated_style->resolve_frequency()->to_hertz();
case Type::Hz:
return m_value;
case Type::kHz:
return m_value * 1000;
}
VERIFY_NOT_REACHED();
}
StringView Frequency::unit_name() const
{
switch (m_type) {
case Type::Calculated:
return "calculated"sv;
case Type::Hz:
return "hz"sv;
case Type::kHz:
return "khz"sv;
}
VERIFY_NOT_REACHED();
}
Optional<Frequency::Type> Frequency::unit_from_name(StringView name)
{
if (name.equals_ignoring_case("hz"sv)) {
return Type::Hz;
} else if (name.equals_ignoring_case("khz"sv)) {
return Type::kHz;
}
return {};
}
}