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75 lines
1.9 KiB
75 lines
1.9 KiB
// Copyright 2017 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "testing/range_set.h"
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#include <algorithm>
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#include "core/fxcrt/fx_system.h"
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RangeSet::RangeSet() {}
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RangeSet::~RangeSet() {}
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bool RangeSet::Contains(const Range& range) const {
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if (IsEmptyRange(range))
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return false;
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const Range fixed_range = FixDirection(range);
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auto it = ranges().upper_bound(fixed_range);
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if (it == ranges().begin())
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return false; // No ranges includes range.first.
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--it; // Now it starts equal or before range.first.
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return it->second >= fixed_range.second;
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}
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void RangeSet::Union(const Range& range) {
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if (IsEmptyRange(range))
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return;
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Range fixed_range = FixDirection(range);
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if (IsEmpty()) {
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ranges_.insert(fixed_range);
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return;
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}
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auto start = ranges_.upper_bound(fixed_range);
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if (start != ranges_.begin())
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--start; // start now points to the key equal or lower than offset.
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if (start->second < fixed_range.first)
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++start; // start element is entirely before current range, skip it.
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auto end = ranges_.upper_bound(Range(fixed_range.second, fixed_range.second));
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if (start == end) { // No ranges to merge.
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ranges_.insert(fixed_range);
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return;
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}
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--end;
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const int new_start = std::min<size_t>(start->first, fixed_range.first);
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const int new_end = std::max(end->second, fixed_range.second);
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ranges_.erase(start, ++end);
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ranges_.insert(Range(new_start, new_end));
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}
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void RangeSet::Union(const RangeSet& range_set) {
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ASSERT(&range_set != this);
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for (const auto& it : range_set.ranges())
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Union(it);
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}
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RangeSet::Range RangeSet::FixDirection(const Range& range) const {
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return range.first <= range.second ? range
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: Range(range.second + 1, range.first + 1);
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}
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bool RangeSet::IsEmptyRange(const Range& range) const {
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return range.first == range.second;
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}
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