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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/.
*/
#include <sal/config.h>
#include <string_view>
#include <editeng/Trie.hxx>
namespace editeng
{
/* TrieNode */
struct TrieNode final
{
static const int LATIN_ARRAY_SIZE = 26;
sal_Unicode mCharacter;
bool mMarker;
std::vector<std::unique_ptr<TrieNode>> mChildren;
std::unique_ptr<TrieNode> mLatinArray[LATIN_ARRAY_SIZE];
explicit TrieNode(sal_Unicode aCharacter = '\0');
void markWord();
TrieNode* findChild(sal_Unicode aCharacter);
TrieNode* traversePath(const OUString& sPath);
void addNewChild(TrieNode* pChild);
void collectSuggestions(std::u16string_view sPath, std::vector<OUString>& rSuggestionList);
static void collectSuggestionsForCurrentNode(TrieNode* pCurrent, std::u16string_view sPath, std::vector<OUString>& rSuggestionList);
};
TrieNode::TrieNode(sal_Unicode aCharacter) :
mCharacter(aCharacter),
mMarker(false)
{
for (auto & i : mLatinArray)
{
i = nullptr;
}
}
void TrieNode::markWord()
{
mMarker = true;
}
void TrieNode::addNewChild(TrieNode* pChild)
{
if (pChild->mCharacter >= 'a' &&
pChild->mCharacter <= 'z')
{
mLatinArray[pChild->mCharacter - u'a'].reset(pChild);
}
else
{
mChildren.push_back(std::unique_ptr<TrieNode>(pChild));
}
}
TrieNode* TrieNode::findChild(sal_Unicode aInputCharacter)
{
if (aInputCharacter >= 'a' &&
aInputCharacter <= 'z')
{
return mLatinArray[aInputCharacter - u'a'].get();
}
for(auto const & pCurrent : mChildren)
{
if ( pCurrent->mCharacter == aInputCharacter )
return pCurrent.get();
}
return nullptr;
}
void TrieNode::collectSuggestions(std::u16string_view sPath, std::vector<OUString>& rSuggestionList)
{
// first traverse nodes for alphabet characters
for (auto const & pCurrent : mLatinArray)
{
if (pCurrent != nullptr)
collectSuggestionsForCurrentNode(pCurrent.get(), sPath, rSuggestionList);
}
// traverse nodes for other characters
for(auto const & pCurrent : mChildren)
{
if (pCurrent != nullptr)
collectSuggestionsForCurrentNode(pCurrent.get(), sPath, rSuggestionList);
}
}
void TrieNode::collectSuggestionsForCurrentNode(TrieNode* pCurrent, std::u16string_view sPath, std::vector<OUString>& rSuggestionList)
{
OUString aStringPath = sPath + OUStringChar(pCurrent->mCharacter);
if(pCurrent->mMarker)
{
rSuggestionList.push_back(aStringPath);
}
// recursively descend tree
pCurrent->collectSuggestions(aStringPath, rSuggestionList);
}
TrieNode* TrieNode::traversePath(const OUString& sPath)
{
TrieNode* pCurrent = this;
for ( sal_Int32 i = 0; i < sPath.getLength(); i++ )
{
sal_Unicode aCurrentChar = sPath[i];
pCurrent = pCurrent->findChild(aCurrentChar);
if ( pCurrent == nullptr )
return nullptr;
}
return pCurrent;
}
/* TRIE */
Trie::Trie() :
mRoot(new TrieNode())
{}
Trie::~Trie()
{}
void Trie::insert(const OUString& sInputString) const
{
// adding an empty word is not allowed
if ( sInputString.isEmpty() )
{
return;
}
// traverse the input string and modify the tree with new nodes / characters
TrieNode* pCurrent = mRoot.get();
sal_Unicode aCurrentChar;
for ( sal_Int32 i = 0; i < sInputString.getLength(); i++ )
{
aCurrentChar = sInputString[i];
TrieNode* pChild = pCurrent->findChild(aCurrentChar);
if ( pChild == nullptr )
{
TrieNode* pNewNode = new TrieNode(aCurrentChar);
pCurrent->addNewChild(pNewNode);
pCurrent = pNewNode;
}
else
{
pCurrent = pChild;
}
}
pCurrent->markWord();
}
void Trie::findSuggestions(const OUString& sWordPart, std::vector<OUString>& rSuggestionList) const
{
TrieNode* pNode = mRoot->traversePath(sWordPart);
if (pNode != nullptr)
{
pNode->collectSuggestions(sWordPart, rSuggestionList);
}
}
size_t Trie::size() const
{
if (!mRoot)
return 0;
std::vector<OUString> entries;
mRoot->collectSuggestions(std::u16string_view(), entries);
return entries.size();
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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