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/*
* Copyright (C) 2015-2017 Apple Inc. 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 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,
* 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 <limits.h>
#include <wtf/MathExtras.h>
#include <wtf/PrintStream.h>
namespace WTF {
// Note that the 'begin' is inclusive, while the 'end' is exclusive. These two ranges are non-
// overlapping:
//
// rangeA = 0...8
// rangeB = 8...16
template<typename PassedType>
class Range {
WTF_MAKE_FAST_ALLOCATED;
public:
typedef PassedType Type;
Range()
: m_begin(0)
, m_end(0)
{
}
explicit Range(Type value)
: m_begin(value)
, m_end(value + 1)
{
ASSERT(m_end >= m_begin);
}
Range(Type begin, Type end)
: m_begin(begin)
, m_end(end)
{
ASSERT(m_end >= m_begin);
if (m_begin == m_end) {
// Canonicalize empty ranges.
m_begin = 0;
m_end = 0;
}
}
static Range top()
{
return Range(std::numeric_limits<Type>::min(), std::numeric_limits<Type>::max());
}
friend bool operator==(const Range&, const Range&) = default;
explicit operator bool() const { return m_begin != m_end; }
Range operator|(const Range& other) const
{
if (!*this)
return other;
if (!other)
return *this;
return Range(
std::min(m_begin, other.m_begin),
std::max(m_end, other.m_end));
}
Range& operator|=(const Range& other)
{
return *this = *this | other;
}
Type begin() const { return m_begin; }
Type end() const { return m_end; }
Type distance() const { return end() - begin(); }
bool overlaps(const Range& other) const
{
return WTF::rangesOverlap(m_begin, m_end, other.m_begin, other.m_end);
}
bool contains(Type point) const
{
return m_begin <= point && point < m_end;
}
void dump(PrintStream& out) const
{
if (*this == Range()) {
out.print("Bottom");
return;
}
if (*this == top()) {
out.print("Top");
return;
}
if (m_begin + 1 == m_end) {
out.print(m_begin);
return;
}
out.print(m_begin, "...", m_end);
}
private:
Type m_begin;
Type m_end;
};
} // namespace WTF
using WTF::Range;
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