Mercurial > dedupe

annotate EditDistance.cpp @ 115:404795616b1e default tip

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Added a lot of common files to ignore
author Tom Fredrik Blenning Klaussen <bfg@bfgconsult.no>
date Sat, 25 Mar 2017 17:43:57 +0100
parents 9744ec195be3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "EditDistance.hpp"
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3 #include <boost/numeric/ublas/matrix.hpp>
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4
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5 #define CharComparer(A, B) (QChar(A) == QChar(B))
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7 void EditDistance::removeDiacriticsNoCopy(QString& in)
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8 {
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9 for(QString::iterator c = in.begin();
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10 c != in.end(); ++c) {
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11 if (c->decompositionTag() != QChar::NoDecomposition) {
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12 QString tmp = c->decomposition();
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13 *c = tmp[0];
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14 }
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15 }
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16 }
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18 QString EditDistance::removeDiacritics(const QString& in)
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19 {
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20 QString out = in;
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21 removeDiacriticsNoCopy(out);
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22 return out;
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23 }
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24
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25 int EditDistance::Compute(QString a, QString b, bool remove) {
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26 if (remove) {
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27 removeDiacriticsNoCopy(a);
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28 removeDiacriticsNoCopy(b);
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29 }
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31 uint s1 = a.size();
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32 uint s2 = b.size();
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34 // Allocate distance matrix
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35 boost::numeric::ublas::matrix<int> d(s1 + 1, s2 + 1);
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36 d.clear();
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37
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38 // Compute distance
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39 for (uint i = 0; i <= s1; ++i)
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40 d(i, 0) = i;
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41 for (uint j = 0; j <= s2; ++j)
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42 d(0, j) = j;
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43 for (uint i = 1; i <= s1; ++i) {
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44 for (uint j = 1; j <= s2; ++j) {
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45 if (CharComparer(a.at(i - 1), b.at(j - 1))) {
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46 // No change required
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47 d(i, j) = d(i - 1, j - 1);
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48 }
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49 else {
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50 d(i, j) =
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51 std::min(d(i - 1, j) + 1, // Deletion
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52 std::min(d(i, j - 1) + 1, // Insertion
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53 d(i - 1, j - 1) + 1)); // Substitution
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54 }
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55 }
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56 }
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57
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58 // Return final value
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59 int retVal = d(s1, s2);
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61 return retVal;
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62 }