121 lines
3.1 KiB
C++
121 lines
3.1 KiB
C++
/* A range adapter that wraps multiple ranges
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef GDBSUPPORT_RANGE_CHAIN_H
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#define GDBSUPPORT_RANGE_CHAIN_H
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/* A range adapter that presents a number of ranges as if it were a
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single range. That is, iterating over a range_chain will iterate
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over each sub-range in order. */
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template<typename Range>
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struct range_chain
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{
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/* The type of the iterator that is created by this range. */
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class iterator
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{
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public:
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iterator (const std::vector<Range> &ranges, size_t idx)
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: m_index (idx),
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m_ranges (ranges)
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{
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skip_empty ();
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}
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bool operator== (const iterator &other) const
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{
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if (m_index != other.m_index || &m_ranges != &other.m_ranges)
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return false;
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if (m_current.has_value () != other.m_current.has_value ())
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return false;
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if (m_current.has_value ())
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return *m_current == *other.m_current;
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return true;
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}
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bool operator!= (const iterator &other) const
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{
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return !(*this == other);
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}
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iterator &operator++ ()
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{
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++*m_current;
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if (*m_current == m_ranges[m_index].end ())
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{
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++m_index;
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skip_empty ();
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}
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return *this;
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}
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typename Range::iterator::value_type operator* () const
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{
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return **m_current;
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}
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private:
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/* Skip empty sub-ranges. If this finds a valid sub-range,
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m_current is updated to point to its start; otherwise,
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m_current is reset. */
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void skip_empty ()
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{
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for (; m_index < m_ranges.size (); ++m_index)
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{
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m_current = m_ranges[m_index].begin ();
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if (*m_current != m_ranges[m_index].end ())
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return;
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}
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m_current.reset ();
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}
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/* Index into the vector indicating where the current iterator
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comes from. */
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size_t m_index;
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/* The current iterator into one of the vector ranges. If no
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value then this (outer) iterator is at the end of the overall
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range. */
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gdb::optional<typename Range::iterator> m_current;
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/* Vector of ranges. */
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const std::vector<Range> &m_ranges;
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};
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/* Create a new range_chain. */
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template<typename T>
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range_chain (T &&ranges)
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: m_ranges (std::forward<T> (ranges))
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{
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}
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iterator begin () const
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{
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return iterator (m_ranges, 0);
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}
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iterator end () const
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{
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return iterator (m_ranges, m_ranges.size ());
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}
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private:
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/* The sub-ranges. */
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std::vector<Range> m_ranges;
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};
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#endif /* GDBSUPPORT_RANGE_CHAIN_H */
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