overleaf/services/document-updater/app/js/DiffCodec.js

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/* eslint-disable
camelcase,
handle-callback-err,
new-cap,
no-throw-literal,
no-unused-vars,
*/
// TODO: This file was created by bulk-decaffeinate.
// Fix any style issues and re-enable lint.
/*
* decaffeinate suggestions:
* DS101: Remove unnecessary use of Array.from
* DS102: Remove unnecessary code created because of implicit returns
* DS207: Consider shorter variations of null checks
* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
*/
let DiffCodec
const { diff_match_patch } = require('../lib/diff_match_patch')
const dmp = new diff_match_patch()
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module.exports = DiffCodec = {
ADDED: 1,
REMOVED: -1,
UNCHANGED: 0,
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diffAsShareJsOp(before, after, callback) {
if (callback == null) {
callback = function (error, ops) {}
}
const diffs = dmp.diff_main(before.join('\n'), after.join('\n'))
dmp.diff_cleanupSemantic(diffs)
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const ops = []
let position = 0
for (const diff of Array.from(diffs)) {
const type = diff[0]
const content = diff[1]
if (type === this.ADDED) {
ops.push({
i: content,
p: position
})
position += content.length
} else if (type === this.REMOVED) {
ops.push({
d: content,
p: position
})
} else if (type === this.UNCHANGED) {
position += content.length
} else {
throw 'Unknown type'
}
}
return callback(null, ops)
}
}