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- (function() {
- 'use strict';
-
- var collator;
- try {
- collator = (typeof Intl !== "undefined" && typeof Intl.Collator !== "undefined") ? Intl.Collator("generic", { sensitivity: "base" }) : null;
- } catch (err){
- console.log("Collator could not be initialized and wouldn't be used");
- }
-
- var prevRow = [],
- str2Char = [];
-
-
- var Levenshtein = {
-
- get: function(str1, str2, options) {
- var useCollator = (options && collator && options.useCollator);
-
- var str1Len = str1.length,
- str2Len = str2.length;
-
-
- if (str1Len === 0) return str2Len;
- if (str2Len === 0) return str1Len;
-
- var curCol, nextCol, i, j, tmp;
-
- for (i=0; i<str2Len; ++i) {
- prevRow[i] = i;
- str2Char[i] = str2.charCodeAt(i);
- }
- prevRow[str2Len] = str2Len;
- var strCmp;
- if (useCollator) {
-
- for (i = 0; i < str1Len; ++i) {
- nextCol = i + 1;
- for (j = 0; j < str2Len; ++j) {
- curCol = nextCol;
-
- strCmp = 0 === collator.compare(str1.charAt(i), String.fromCharCode(str2Char[j]));
- nextCol = prevRow[j] + (strCmp ? 0 : 1);
-
- tmp = curCol + 1;
- if (nextCol > tmp) {
- nextCol = tmp;
- }
-
- tmp = prevRow[j + 1] + 1;
- if (nextCol > tmp) {
- nextCol = tmp;
- }
-
- prevRow[j] = curCol;
- }
-
- prevRow[j] = nextCol;
- }
- }
- else {
-
- for (i = 0; i < str1Len; ++i) {
- nextCol = i + 1;
- for (j = 0; j < str2Len; ++j) {
- curCol = nextCol;
-
- strCmp = str1.charCodeAt(i) === str2Char[j];
- nextCol = prevRow[j] + (strCmp ? 0 : 1);
-
- tmp = curCol + 1;
- if (nextCol > tmp) {
- nextCol = tmp;
- }
-
- tmp = prevRow[j + 1] + 1;
- if (nextCol > tmp) {
- nextCol = tmp;
- }
-
- prevRow[j] = curCol;
- }
-
- prevRow[j] = nextCol;
- }
- }
- return nextCol;
- }
- };
-
- if (typeof define !== "undefined" && define !== null && define.amd) {
- define(function() {
- return Levenshtein;
- });
- }
-
- else if (typeof module !== "undefined" && module !== null && typeof exports !== "undefined" && module.exports === exports) {
- module.exports = Levenshtein;
- }
-
- else if (typeof self !== "undefined" && typeof self.postMessage === 'function' && typeof self.importScripts === 'function') {
- self.Levenshtein = Levenshtein;
- }
-
- else if (typeof window !== "undefined" && window !== null) {
- window.Levenshtein = Levenshtein;
- }
- }());
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