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105 lines
1.9 KiB
105 lines
1.9 KiB
'use strict';
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module.exports = (function()
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{
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function _min(d0, d1, d2, bx, ay)
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{
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return d0 < d1 || d2 < d1
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? d0 > d2
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? d2 + 1
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: d0 + 1
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: bx === ay
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? d1
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: d1 + 1;
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}
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return function(a, b)
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{
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if (a === b) {
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return 0;
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}
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if (a.length > b.length) {
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var tmp = a;
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a = b;
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b = tmp;
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}
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var la = a.length;
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var lb = b.length;
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while (la > 0 && (a.charCodeAt(la - 1) === b.charCodeAt(lb - 1))) {
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la--;
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lb--;
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}
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var offset = 0;
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while (offset < la && (a.charCodeAt(offset) === b.charCodeAt(offset))) {
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offset++;
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}
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la -= offset;
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lb -= offset;
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if (la === 0 || lb < 3) {
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return lb;
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}
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var x = 0;
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var y;
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var d0;
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var d1;
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var d2;
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var d3;
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var dd;
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var dy;
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var ay;
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var bx0;
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var bx1;
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var bx2;
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var bx3;
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var vector = [];
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for (y = 0; y < la; y++) {
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vector.push(y + 1);
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vector.push(a.charCodeAt(offset + y));
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}
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var len = vector.length - 1;
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for (; x < lb - 3;) {
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bx0 = b.charCodeAt(offset + (d0 = x));
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bx1 = b.charCodeAt(offset + (d1 = x + 1));
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bx2 = b.charCodeAt(offset + (d2 = x + 2));
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bx3 = b.charCodeAt(offset + (d3 = x + 3));
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dd = (x += 4);
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for (y = 0; y < len; y += 2) {
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dy = vector[y];
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ay = vector[y + 1];
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d0 = _min(dy, d0, d1, bx0, ay);
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d1 = _min(d0, d1, d2, bx1, ay);
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d2 = _min(d1, d2, d3, bx2, ay);
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dd = _min(d2, d3, dd, bx3, ay);
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vector[y] = dd;
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d3 = d2;
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d2 = d1;
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d1 = d0;
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d0 = dy;
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}
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}
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for (; x < lb;) {
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bx0 = b.charCodeAt(offset + (d0 = x));
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dd = ++x;
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for (y = 0; y < len; y += 2) {
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dy = vector[y];
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vector[y] = dd = _min(dy, d0, dd, bx0, vector[y + 1]);
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d0 = dy;
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}
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}
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return dd;
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};
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})();
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