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-/*
- This file is part of Raul.
- Copyright 2007-2012 David Robillard <http://drobilla.net>
-
- Raul is free software: you can redistribute it and/or modify it under the
- terms of the GNU General Public License as published by the Free Software
- Foundation, either version 3 of the License, or any later version.
-
- Raul is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- A PARTICULAR PURPOSE. See the GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Raul. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef RAUL_TABLE_IMPL_HPP
-#define RAUL_TABLE_IMPL_HPP
-
-#include <algorithm>
-#include <cassert>
-#include <stdexcept>
-#include <utility>
-#include <vector>
-
-#include "raul/Table.hpp"
-
-namespace Raul {
-
-/* FIXME: This could be a lot less code... */
-
-#ifdef TABLE_SORT_DEBUG
-template <typename K, typename T>
-bool
-Table<K,T>::is_sorted() const
-{
- if (size() <= 1)
- return true;
-
- K prev_key = _entries[0].first;
-
- for (size_t i=1; i < size(); ++i)
- if (_entries[i].first < prev_key)
- return false;
- else
- prev_key = _entries[i].first;
-
- return true;
-}
-#endif
-
-/** Binary search (O(log(n))) */
-template <typename K, typename T>
-typename Table<K,T>::const_iterator
-Table<K,T>::find(const K& key) const
-{
- return ((Table<K,T>*)this)->find(key);
-}
-
-/** Binary search (O(log(n))) */
-template <typename K, typename T>
-typename Table<K,T>::iterator
-Table<K,T>::find(const K& key)
-{
- return find(begin(), end(), key);
-}
-
-/** Binary search (O(log(end - start))) */
-template <typename K, typename T>
-typename Table<K,T>::const_iterator
-Table<K,T>::find(const_iterator start, const_iterator finish, const K& key) const
-{
- return ((Table<K,T>*)this)->find(start, finish, key);
-}
-
-/** Binary search (O(log(end - start))) */
-template <typename K, typename T>
-typename Table<K,T>::iterator
-Table<K,T>::find(const_iterator start, const_iterator finish, const K& key)
-{
- if (size() == 0)
- return end();
-
- size_t lower = start._index;
- size_t upper = finish._index - 1;
- size_t i;
-
- while (upper >= lower) {
- i = lower + ((upper - lower) / 2);
- const Entry& elem = _entries[i];
-
- if (elem.first == key)
- return iterator(*this, i);
- else if (i < size()-1 && elem.first < key)
- lower = i + 1;
- else if (i > 0)
- upper = i - 1;
- else
- break;
- }
-
- return end();
-}
-
-/** Find the end of a range using a custom comparator.
- * Two entries a, b are considered in the range if comp(a, b) returns true.
- *
- * Returns an iterator exactly one entry past the end of the range (possibly end()).
- *
- * WARNING: The restrictions on \a comparator are very strict: ALL items
- * considered equal by \a comparator must be stored in the Table consecutively
- * i.e. there are no 3 values a, b, c S.T. comp(a) && ! comp(b) && comp(c).
- *
- * This is useful for very quickly finding all children of a Path, which
- * obey the above rule with lexicographical order.
- */
-template <typename K, typename T>
-typename Table<K,T>::const_iterator
-Table<K,T>::find_range_end(const_iterator start, bool (*comp)(const K&,const K&)) const
-{
- return (const_cast<Table<K, T>&>(*this)).find_range_end(*((iterator*)&start), comp);
-}
-
-/** Find the end of a range using a custom comparator.
- * Two entries a, b are considered in the range if comp(a, b) returns true.
- *
- * Returns an iterator exactly one entry past the end of the range (possibly end()).
- *
- * WARNING: The restrictions on \a comparator are very strict: ALL items
- * considered equal by \a comparator must be stored in the Table consecutively
- * i.e. there are no 3 values a, b, c S.T. comp(a) && ! comp(b) && comp(c).
- *
- * This is useful for very quickly finding all children of a Path, which
- * obey the above rule with lexicographical order.
- */
-template <typename K, typename T>
-typename Table<K,T>::iterator
-Table<K,T>::find_range_end(iterator start, bool (*comp)(const K&,const K&))
-{
- if (size() == 0 || start == end())
- return this->end();
-
- const K& key = start->first;
-
- size_t lower = start._index;
- size_t upper = size() - 1;
-
- if (lower == upper) {
- if (comp(key, _entries[lower].first))
- return iterator(*this, lower+1);
- else
- return this->end();
- }
-
- size_t i;
-
- while (upper > lower) {
-
- i = lower + ((upper - lower) / 2);
-
- if (upper - lower == 1) {
- if (comp(key, _entries[upper].first) && upper < size())
- return iterator(*this, upper+1);
- else if (lower < size())
- return iterator(*this, lower+1);
- }
-
- const Entry& elem = _entries[i];
-
- // Hit
- if (comp(key, elem.first)) {
-
- if (i == size()-1 || !comp(key, _entries[i+1].first))
- return iterator(*this, i+1);
- else
- lower = i;
-
- // Miss
- } else {
-
- upper = i;
-
- }
- }
-
- assert(comp(start->first, _entries[lower].first));
- assert(lower == size()-1 || !comp(start->first, _entries[lower+1].first));
-
- return iterator(*this, lower+1);
-}
-
-/** Erase and return a range of entries */
-template <typename K, typename T>
-SharedPtr< Table<K, T> >
-Table<K, T>::yank(iterator start, iterator end)
-{
- SharedPtr< Table<K, T> > ret(new Table<K, T>(end._index - start._index));
- for (size_t i=start._index; i < end._index; ++i)
- ret->_entries.at(i - start._index) = _entries[i];
- erase(start, end);
- return ret;
-}
-
-/** Cram a range of entries back in.
- * Range MUST follow the same ordering guidelines as find_range_end.
- * Return type is the same as insert, iterator points to first inserted entry */
-template <typename K, typename T>
-std::pair<typename Table<K,T>::iterator, bool>
-Table<K, T>::cram(const Table<K,T>& range)
-{
- /* FIXME: _way_ too slow */
-
- const size_t orig_size = size();
-
- if (range.size() == 0)
- return std::make_pair(end(), false);
-
- std::pair<iterator, bool> ret = insert(range._entries.front());
- if (range.size() == 1)
- return ret;
-
- const size_t insert_index = ret.first._index;
-
- std::vector<Entry> new_entries(orig_size + range.size());
-
- for (size_t i=0; i <= insert_index; ++i)
- new_entries.at(i) = _entries.at(i);
-
- for (size_t i=0; i < size() - insert_index; ++i)
- new_entries.at(new_entries.size() - 1 - i) = _entries.at(size() - 1 - i);
-
- for (size_t i=1; i < range.size(); ++i)
- new_entries.at(insert_index + i) = range._entries.at(i);
-
- _entries = new_entries;
-
- assert(size() == orig_size + range.size());
-#ifdef TABLE_SORT_DEBUG
- assert(is_sorted());
-#endif
-
- return std::make_pair(iterator(*this, insert_index), true);
-}
-
-/** Add an item to the table, using \a entry.first as the search key.
- * An iterator to the element where value was set is returned, and a bool which
- * is true if an insertion took place, or false if an existing entry was updated.
- * Matches std::map::insert interface.
- * O(n) worst case
- * O(log(n)) best case (capacity is large enough)
- */
-template <typename K, typename T>
-std::pair<typename Table<K,T>::iterator, bool>
-Table<K,T>::insert(const std::pair<K, T>& entry)
-{
- const K& key = entry.first;
- const T& value = entry.second;
-
- if (size() == 0 || (size() == 1 && _entries[0].first < key)) {
- _entries.push_back(entry);
- return std::make_pair(iterator(*this, size()-1), true);
- } else if (size() == 1) {
- _entries.push_back(_entries[0]);
- _entries[0] = entry;
- return std::make_pair(begin(), true);
- }
-
- size_t lower = 0;
- size_t upper = size() - 1;
- size_t i;
-
- // Find the earliest element > key
- while (upper >= lower) {
- i = lower + ((upper - lower) / 2);
- assert(i >= lower);
- assert(i <= upper);
- assert(_entries[lower].first <= _entries[i].first);
- assert(_entries[i].first <= _entries[upper].first);
-
- assert(i < size());
- Entry& elem = _entries[i];
-
- if (elem.first == key) {
- elem.second = value;
- return std::make_pair(iterator(*this, i), false);
- } else if (key < elem.first) {
- if (i == 0 || _entries[i-1].first < key)
- break;
- upper = i - 1;
- } else {
- lower = i + 1;
- }
- }
-
- // Lil' off by one touchup :)
- if (i < size() && _entries[i].first <= key)
- ++i;
-
- _entries.push_back(_entries.back());
-
- // Shift everything beyond i right
- for (size_t j = size()-2; j > i; --j)
- _entries[j] = _entries[j-1];
-
- _entries[i] = entry;
-
-#ifdef TABLE_SORT_DEBUG
- assert(is_sorted());
-#endif
-
- return std::make_pair(iterator(*this, i), true);
-}
-
-/** Insert an item, and return a reference to it's value.
- *
- * This may be used to insert values with pretty syntax:
- *
- * table["gorilla"] = "killa";
- *
- * T must have a default constructor for this to be possible.
- */
-template <typename K, typename T>
-T&
-Table<K, T>::operator[](const K& key)
-{
- iterator i = find(key);
- if (i != end()) {
- return i->second;
- } else {
- std::pair<iterator,bool> ret = insert(std::make_pair(key, T()));
- return ret.first->second;
- }
-}
-
-template <typename K, typename T>
-void
-Table<K,T>::erase(const K& key)
-{
- erase(find(key));
-}
-
-template <typename K, typename T>
-void
-Table<K,T>::erase(iterator i)
-{
- if (i == end())
- return;
-
- const size_t index = i._index;
-
- // Shift left
- for (size_t j=index; j < size()-1; ++j)
- _entries[j] = _entries[j+1];
-
- _entries.pop_back();
-
-#ifdef TABLE_SORT_DEBUG
- assert(is_sorted());
-#endif
-}
-
-/** Erase a range of elements from \a first to \a last, including first but
- * not including last.
- */
-template <typename K, typename T>
-void
-Table<K,T>::erase(iterator first, iterator last)
-{
- const size_t first_index = first._index;
- const size_t last_index = last._index;
-
- Table<K,T>::erase_by_index(first_index, last_index);
-}
-
-/** Erase a range of elements from \a first_index to \a last_index, including
- * first_index but not including last_index.
- */
-template <typename K, typename T>
-void
-Table<K,T>::erase_by_index(size_t first_index, size_t last_index)
-{
- const size_t num_removed = last_index - first_index;
-
- // Shift left
- for (size_t j=first_index; j < size() - num_removed; ++j)
- _entries[j] = _entries[j + num_removed];
-
- _entries.resize(size() - num_removed);
-
-#ifdef TABLE_SORT_DEBUG
- assert(is_sorted());
-#endif
-}
-
-} // namespace Raul
-
-#endif // RAUL_TABLE_IMLP_HPP
-