138 lines
4 KiB
C++
138 lines
4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef INCLUDED_SC_INC_FSTALGORITHM_HXX
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#define INCLUDED_SC_INC_FSTALGORITHM_HXX
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#include <mdds/flat_segment_tree.hpp>
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#include <vector>
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namespace sc {
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template<typename Key, typename Span>
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void buildSpan(
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std::vector<Span>& rSpans,
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typename mdds::flat_segment_tree<Key,bool>::const_iterator it,
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typename mdds::flat_segment_tree<Key,bool>::const_iterator itEnd, const Key* pStart )
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{
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Key nLastPos = it->first;
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bool bLastVal = it->second;
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for (++it; it != itEnd; ++it)
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{
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Key nThisPos = it->first;
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bool bThisVal = it->second;
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if (bLastVal)
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{
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Key nIndex1 = nLastPos;
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Key nIndex2 = nThisPos-1;
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if (!pStart || *pStart < nIndex1)
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rSpans.push_back(Span(nIndex1, nIndex2));
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else if (*pStart <= nIndex2)
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rSpans.push_back(Span(*pStart, nIndex2));
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}
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nLastPos = nThisPos;
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bLastVal = bThisVal;
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}
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}
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template<typename Key, typename Val, typename Span>
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void buildSpanWithValue(
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std::vector<Span>& rSpans,
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typename mdds::flat_segment_tree<Key,Val>::const_iterator it,
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typename mdds::flat_segment_tree<Key,Val>::const_iterator itEnd, const Key* pStart )
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{
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Key nLastPos = it->first;
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Val nLastVal = it->second;
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for (++it; it != itEnd; ++it)
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{
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Key nThisPos = it->first;
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Val nThisVal = it->second;
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if (nLastVal)
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{
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Key nIndex1 = nLastPos;
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Key nIndex2 = nThisPos-1;
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if (!pStart || *pStart < nIndex1)
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rSpans.push_back(Span(nIndex1, nIndex2, nLastVal));
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else if (*pStart <= nIndex2)
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rSpans.push_back(Span(*pStart, nIndex2, nLastVal));
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}
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nLastPos = nThisPos;
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nLastVal = nThisVal;
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}
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}
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/**
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* Convert a flat_segment_tree structure whose value type is boolean, into
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* an array of ranges that corresponds with the segments that have a 'true'
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* value.
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*/
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template<typename Key, typename Span>
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std::vector<Span> toSpanArray( const mdds::flat_segment_tree<Key,bool>& rTree )
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{
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typedef mdds::flat_segment_tree<Key,bool> FstType;
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std::vector<Span> aSpans;
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typename FstType::const_iterator it = rTree.begin(), itEnd = rTree.end();
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buildSpan<Key,Span>(aSpans, it, itEnd, nullptr);
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return aSpans;
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}
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/**
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* Convert a flat_segment_tree structure into an array of ranges with
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* values. Only those ranges whose value is evaluated to be true will be
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* included. The value type must be something that supports bool operator.
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* The span type must support a constructor that takes a start key, an end
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* key and a value in this order.
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*/
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template<typename Key, typename Val, typename Span>
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std::vector<Span> toSpanArrayWithValue( const mdds::flat_segment_tree<Key,Val>& rTree )
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{
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typedef mdds::flat_segment_tree<Key,Val> FstType;
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std::vector<Span> aSpans;
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typename FstType::const_iterator it = rTree.begin(), itEnd = rTree.end();
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buildSpanWithValue<Key,Val,Span>(aSpans, it, itEnd, nullptr);
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return aSpans;
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}
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template<typename Key, typename Span>
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std::vector<Span> toSpanArray( const mdds::flat_segment_tree<Key,bool>& rTree, Key nStartPos )
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{
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typedef mdds::flat_segment_tree<Key,bool> FstType;
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std::vector<Span> aSpans;
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if (!rTree.is_tree_valid())
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return aSpans;
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bool bThisVal = false;
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std::pair<typename FstType::const_iterator, bool> r =
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rTree.search_tree(nStartPos, bThisVal);
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if (!r.second)
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// Tree search failed.
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return aSpans;
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typename FstType::const_iterator it = r.first, itEnd = rTree.end();
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buildSpan<Key,Span>(aSpans, it, itEnd, &nStartPos);
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return aSpans;
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}
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}
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#endif
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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