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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#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;
qsizetype m = s.size() + 1;
qsizetype n = t.size() + 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)
{
if (actual.isEmpty())
return QString();
int deltaBest = 10000;
int numBest = 0;
QString best;
for (const auto &candidate : candidates) {
if (candidate[0] == actual[0]) {
int delta = editDistance(actual, candidate);
if (delta < deltaBest) {
deltaBest = delta;
numBest = 1;
best = candidate;
} else if (delta == deltaBest) {
++numBest;
}
}
}
if (numBest == 1 && deltaBest <= 2 && actual.size() + best.size() >= 5)
return best;
return QString();
}
QT_END_NAMESPACE
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