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if (i > 1 && j > 1 && s1[i] == s2[j-1] && s1[i-1] == s2[j]) {
matrix[i][j] = Math.min(matrix[i][j], matrix[i-2][j-2] + nCost); // Transposition
}
}
}
return Math.floor(matrix[nLen1][nLen2]);
}
catch (e) {
console.error(e);
}
},
distanceDamerauLevenshtein2: function (s1, s2) {
// distance of Damerau-Levenshtein between <s1> and <s2>
// https://fr.wikipedia.org/wiki/Distance_de_Damerau-Levenshtein
try {
let nLen1 = s1.length;
let nLen2 = s2.length;
let INF = nLen1 + nLen2;
let matrix = [];
let sd = {};
for (let i = 0; i < nLen1+2; i++) {
matrix[i] = new Array(nLen2+2);
}
matrix[0][0] = INF;
for (let i = 0; i <= nLen1; i++) {
matrix[i+1][1] = i;
matrix[i+1][0] = INF;
sd[s1[i]] = 0;
}
for (let j = 0; j <= nLen2; j++) {
matrix[1][j+1] = j;
matrix[0][j+1] = INF;
sd[s2[j]] = 0;
}
for (let i = 1; i <= nLen1; i++) {
let DB = 0;
for (let j = 1; j <= nLen2; j++) {
let i1 = sd[s2[j-1]];
let j1 = DB;
if (s1[i-1] === s2[j-1]) {
matrix[i+1][j+1] = matrix[i][j];
DB = j;
}
else {
matrix[i+1][j+1] = Math.min(matrix[i][j], Math.min(matrix[i+1][j], matrix[i][j+1])) + 1;
}
matrix[i+1][j+1] = Math.min(matrix[i+1][j+1], matrix[i1] ? matrix[i1][j1] + (i-i1-1) + 1 + (j-j1-1) : Infinity);
}
sd[s1[i-1]] = i;
}
return matrix[nLen1+1][nLen2+1];
}
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if (i > 1 && j > 1 && s1[i] == s2[j-1] && s1[i-1] == s2[j]) {
matrix[i][j] = Math.min(matrix[i][j], matrix[i-2][j-2] + nCost); // Transposition
}
}
}
return Math.floor(matrix[nLen1][nLen2]);
}
catch (e) {
console.error(e);
}
},
showDistance (s1, s2) {
console.log(`Distance: ${s1} / ${s2} = ${this.distanceDamerauLevenshtein(s1, s2)})`);
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