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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the tools applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
/*
editdistance.cpp
*/
#include "editdistance.h"
QT_BEGIN_NAMESPACE
int editDistance( const QString& s, const QString& t )
{
#define D( i, j ) d[(i) * n + (j)]
int i;
int j;
int m = s.length() + 1;
int n = t.length() + 1;
int *d = new int[m * n];
int result;
for ( i = 0; i < m; i++ )
D( i, 0 ) = i;
for ( j = 0; j < n; j++ )
D( 0, j ) = j;
for ( i = 1; i < m; i++ ) {
for ( j = 1; j < n; j++ ) {
if ( s[i - 1] == t[j - 1] ) {
D( i, j ) = D( i - 1, j - 1 );
} else {
int x = D( i - 1, j );
int y = D( i - 1, j - 1 );
int z = D( i, j - 1 );
D( i, j ) = 1 + qMin( qMin(x, y), z );
}
}
}
result = D( m - 1, n - 1 );
delete[] d;
return result;
#undef D
}
QString nearestName( const QString& actual, const QSet<QString>& candidates )
{
int deltaBest = 10000;
int numBest = 0;
QString best;
QSet<QString>::ConstIterator c = candidates.begin();
while ( c != candidates.end() ) {
if ( (*c)[0] == actual[0] ) {
int delta = editDistance( actual, *c );
if ( delta < deltaBest ) {
deltaBest = delta;
numBest = 1;
best = *c;
} else if ( delta == deltaBest ) {
numBest++;
}
}
++c;
}
if ( numBest == 1 && deltaBest <= 2 &&
actual.length() + best.length() >= 5 ) {
return best;
} else {
return "";
}
}
QT_END_NAMESPACE
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