@antv/path-util
Version:
A common util collection for antv projects
113 lines • 3.43 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var lodash_es_1 = require("lodash-es");
function getMinDiff(del, add, modify) {
var type = null;
var min = modify;
if (add < min) {
min = add;
type = 'add';
}
if (del < min) {
min = del;
type = 'del';
}
return {
type: type,
min: min,
};
}
/*
* https://en.wikipedia.org/wiki/Levenshtein_distance
* 计算两条path的编辑距离
*/
var levenshteinDistance = function (source, target) {
var sourceLen = source.length;
var targetLen = target.length;
var sourceSegment, targetSegment;
var temp = 0;
if (sourceLen === 0 || targetLen === 0) {
return null;
}
var dist = [];
for (var i = 0; i <= sourceLen; i++) {
dist[i] = [];
dist[i][0] = { min: i };
}
for (var j = 0; j <= targetLen; j++) {
dist[0][j] = { min: j };
}
for (var i = 1; i <= sourceLen; i++) {
sourceSegment = source[i - 1];
for (var j = 1; j <= targetLen; j++) {
targetSegment = target[j - 1];
if (lodash_es_1.isEqual(sourceSegment, targetSegment)) {
temp = 0;
}
else {
temp = 1;
}
var del = dist[i - 1][j].min + 1;
var add = dist[i][j - 1].min + 1;
var modify = dist[i - 1][j - 1].min + temp;
dist[i][j] = getMinDiff(del, add, modify);
}
}
return dist;
};
function fillPathByDiff(source, target) {
var diffMatrix = levenshteinDistance(source, target);
var sourceLen = source.length;
var targetLen = target.length;
var changes = [];
var index = 1;
var minPos = 1;
// 如果source和target不是完全不相等
// @ts-ignore
if (diffMatrix[sourceLen][targetLen] !== sourceLen) {
// 获取从source到target所需改动
for (var i = 1; i <= sourceLen; i++) {
var min = diffMatrix[i][i].min;
minPos = i;
for (var j = index; j <= targetLen; j++) {
if (diffMatrix[i][j].min < min) {
min = diffMatrix[i][j].min;
minPos = j;
}
}
index = minPos;
if (diffMatrix[i][index].type) {
changes.push({ index: i - 1, type: diffMatrix[i][index].type });
}
}
// 对source进行增删path
for (var i = changes.length - 1; i >= 0; i--) {
index = changes[i].index;
if (changes[i].type === 'add') {
// @ts-ignore
source.splice(index, 0, [].concat(source[index]));
}
else {
// @ts-ignore
source.splice(index, 1);
}
}
}
// source尾部补齐
sourceLen = source.length;
if (sourceLen < targetLen) {
for (var i = 0; i < targetLen - sourceLen; i++) {
if (source[sourceLen - 1][0] === 'z' || source[sourceLen - 1][0] === 'Z') {
// @ts-ignore
source.splice(sourceLen - 2, 0, source[sourceLen - 2]);
}
else {
// @ts-ignore
source.push(source[sourceLen - 1]);
}
}
}
return source;
}
exports.default = fillPathByDiff;
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