mirror of https://github.com/jkjoy/sunpeiwen.git
37 lines
980 B
JavaScript
37 lines
980 B
JavaScript
'use strict';
|
|
|
|
const encodeURL = require('./encode_url');
|
|
|
|
const Cache = require('./cache');
|
|
const cache = new Cache();
|
|
|
|
function relativeUrlHelper(from = '', to = '') {
|
|
return cache.apply(`${from}-${to}`, () => {
|
|
const fromParts = from.split('/');
|
|
const toParts = to.split('/');
|
|
const length = Math.min(fromParts.length, toParts.length);
|
|
let i = 0;
|
|
|
|
for (; i < length; i++) {
|
|
if (fromParts[i] !== toParts[i]) break;
|
|
}
|
|
|
|
let out = toParts.slice(i);
|
|
|
|
for (let j = fromParts.length - i - 1; j > 0; j--) {
|
|
out.unshift('..');
|
|
}
|
|
|
|
const outLength = out.length;
|
|
|
|
// If the last 2 elements of `out` is empty strings, replace them with `index.html`.
|
|
if (outLength > 1 && !out[outLength - 1] && !out[outLength - 2]) {
|
|
out = out.slice(0, outLength - 2).concat('index.html');
|
|
}
|
|
|
|
return encodeURL(out.join('/').replace(/\/{2,}/g, '/'));
|
|
});
|
|
}
|
|
|
|
module.exports = relativeUrlHelper;
|