Created
April 11, 2012 00:10
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Arranged Damerau–Levenshtein distance
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function calcWeight(index, length) | |
{ | |
var distance = (length - 1 - index) / (length - 1); | |
return distance * distance * 0.5 + 1; | |
} | |
function stringsDistance(source, target, distanceLimit) | |
{ | |
if (source === target) | |
{ | |
return 0; | |
} | |
var m = source.length; | |
var n = target.length; | |
if (Math.abs(m - n) > distanceLimit) | |
{ | |
return 100; | |
} | |
var H = []; | |
var i, j; | |
for (i = 0; i < m + 2; i++) | |
{ | |
var HH = []; | |
H[i] = HH; | |
for (j = 0; j < n + 2; j++) | |
{ | |
HH[j] = 0; | |
} | |
} | |
var INF = m + n; | |
H[0][0] = INF; | |
for (i = 0; i <= m; i++) | |
{ | |
H[i + 1].splice(0, 2, INF, i); | |
} | |
var H1 = H[1]; | |
var H0 = H[0]; | |
for (j = 0; j <= n; j++) | |
{ | |
H1[j + 1] = j; | |
H0[j + 1] = INF; | |
} | |
var sd = {}; | |
for (i = 1; i <= m; i++) | |
{ | |
var DB = 0; | |
var Hi = H[i]; | |
var Hi1 = H[i + 1]; | |
var weight = calcWeight(i - 1, m); | |
var c1 = source[i - 1].toLowerCase(); | |
for (j = 1; j <= n; j++) | |
{ | |
var i1 = sd[target[j - 1]] || 0; | |
var j1 = DB; | |
var c2 = target[j - 1]; | |
if (c1 === c2.toLowerCase()) | |
{ | |
Hi1[j + 1] = Hi[j]; | |
DB = j; | |
} | |
else | |
{ | |
Hi1[j + 1] = Math.min(Hi[j], Hi1[j], Hi[j + 1]) + 1 * weight; | |
} | |
Hi1[j + 1] = Math.min(Hi1[j + 1], H[i1][j1] + ((i - i1 - 1) + 1 + (j - j1 - 1)) * weight); | |
} | |
sd[source[i - 1]] = i; | |
//console.log(H); | |
} | |
return H[m + 1][n + 1]; | |
} | |
function test(source, target) | |
{ | |
console.log(source + " <--> " + target + " = " + stringsDistance(source, target, 3)); | |
} | |
test("hello", "hellow"); | |
test("hello", "helol"); | |
test("hello", "helo"); | |
test("hello", "helo"); | |
test("hello", "Hello"); | |
test("log", "cos"); |
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