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