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/*
* Copyright (C) 2024 Samuel Weinig <sam@webkit.org>
*
* 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 APPLE INC. ``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 APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* 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 <algorithm>
#include <limits>
namespace WebCore {
namespace CSS {
// Options to indicate how the range should be interpreted.
enum class RangeOptions {
// `Default` indicates that at parse time, out of range values invalidate the parse.
// Out of range values at style building always clamp.
Default,
// `ClampLower` indicates that parse time, an out of range lower value should clamp
// instead of invalidating the parse. An out of range upper value will still invalidate
// the parse. Out of range values at style building always clamp.
ClampLower,
// `ClampUpper` indicates that parse time, an out of range upper value should clamp
// instead of invalidating the parse. An out of range lower value will still invalidate
// the parse. Out of range values at style building always clamp.
ClampUpper,
// `ClampBoth` indicates that parse time, an out of range lower or upper value should
// clamp instead of invalidating the parse. Out of range values at style building
// always clamp.
ClampBoth
};
// Representation for `CSS bracketed range notation`. Represents a closed range between (and including) `min` and `max`.
// https://drafts.csswg.org/css-values-4/#numeric-ranges
struct Range {
// Convenience to allow for a shorter spelling of the appropriate infinity.
static constexpr auto infinity = std::numeric_limits<double>::infinity();
double min { -infinity };
double max { infinity };
RangeOptions options { RangeOptions::Default };
constexpr Range(double min, double max, RangeOptions options = RangeOptions::Default)
: min { min }
, max { max }
, options { options }
{
}
constexpr bool operator==(const Range&) const = default;
};
// Constant value for `[−∞,∞]`.
inline constexpr auto All = Range { -Range::infinity, Range::infinity, RangeOptions::Default };
// Constant value for `[0,∞]`.
inline constexpr auto Nonnegative = Range { 0, Range::infinity, RangeOptions::Default };
// Constant value for `[0,1]`.
inline constexpr auto ClosedUnitRange = Range { 0, 1 };
// Constant value for `[0,1(clamp upper)]`.
inline constexpr auto ClosedUnitRangeClampUpper = Range { 0, 1, RangeOptions::ClampUpper };
// Constant value for `[0,100]`.
inline constexpr auto ClosedPercentageRange = Range { 0, 100 };
// Constant value for `[0,100(clamp upper)]`.
inline constexpr auto ClosedPercentageRangeClampUpper = Range { 0, 100, RangeOptions::ClampUpper };
// Clamps a floating point value to within `range`.
template<Range range, std::floating_point T> constexpr T clampToRange(T value)
{
return std::clamp<T>(value, range.min, range.max);
}
} // namespace CSS
} // namespace WebCore
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