overleaf/services/document-updater/app/js/sharejs/json-api.js

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/* eslint-disable
camelcase,
no-undef,
*/
// 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
* DS205: Consider reworking code to avoid use of IIFEs
* DS207: Consider shorter variations of null checks
* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
*/
// API for JSON OT
let json
if (typeof WEB === 'undefined') {
json = require('./json')
}
if (typeof WEB !== 'undefined' && WEB !== null) {
const { extendDoc } = exports
exports.extendDoc = function (name, fn) {
SubDoc.prototype[name] = fn
return extendDoc(name, fn)
}
}
const depath = function (path) {
if (path.length === 1 && path[0].constructor === Array) {
return path[0]
} else {
return path
}
}
class SubDoc {
constructor(doc, path) {
this.doc = doc
this.path = path
}
at(...path) {
return this.doc.at(this.path.concat(depath(path)))
}
get() {
return this.doc.getAt(this.path)
}
// for objects and lists
set(value, cb) {
return this.doc.setAt(this.path, value, cb)
}
// for strings and lists.
insert(pos, value, cb) {
return this.doc.insertAt(this.path, pos, value, cb)
}
// for strings
del(pos, length, cb) {
return this.doc.deleteTextAt(this.path, length, pos, cb)
}
// for objects and lists
remove(cb) {
return this.doc.removeAt(this.path, cb)
}
push(value, cb) {
return this.insert(this.get().length, value, cb)
}
move(from, to, cb) {
return this.doc.moveAt(this.path, from, to, cb)
}
add(amount, cb) {
return this.doc.addAt(this.path, amount, cb)
}
on(event, cb) {
return this.doc.addListener(this.path, event, cb)
}
removeListener(l) {
return this.doc.removeListener(l)
}
// text API compatibility
getLength() {
return this.get().length
}
getText() {
return this.get()
}
}
const traverse = function (snapshot, path) {
const container = { data: snapshot }
let key = 'data'
let elem = container
for (const p of Array.from(path)) {
elem = elem[key]
key = p
if (typeof elem === 'undefined') {
throw new Error('bad path')
}
}
return { elem, key }
}
const pathEquals = function (p1, p2) {
if (p1.length !== p2.length) {
return false
}
for (let i = 0; i < p1.length; i++) {
const e = p1[i]
if (e !== p2[i]) {
return false
}
}
return true
}
json.api = {
provides: { json: true },
at(...path) {
return new SubDoc(this, depath(path))
},
get() {
return this.snapshot
},
set(value, cb) {
return this.setAt([], value, cb)
},
getAt(path) {
const { elem, key } = traverse(this.snapshot, path)
return elem[key]
},
setAt(path, value, cb) {
const { elem, key } = traverse(this.snapshot, path)
const op = { p: path }
if (elem.constructor === Array) {
op.li = value
if (typeof elem[key] !== 'undefined') {
op.ld = elem[key]
}
} else if (typeof elem === 'object') {
op.oi = value
if (typeof elem[key] !== 'undefined') {
op.od = elem[key]
}
} else {
throw new Error('bad path')
}
return this.submitOp([op], cb)
},
removeAt(path, cb) {
const { elem, key } = traverse(this.snapshot, path)
if (typeof elem[key] === 'undefined') {
throw new Error('no element at that path')
}
const op = { p: path }
if (elem.constructor === Array) {
op.ld = elem[key]
} else if (typeof elem === 'object') {
op.od = elem[key]
} else {
throw new Error('bad path')
}
return this.submitOp([op], cb)
},
insertAt(path, pos, value, cb) {
const { elem, key } = traverse(this.snapshot, path)
const op = { p: path.concat(pos) }
if (elem[key].constructor === Array) {
op.li = value
} else if (typeof elem[key] === 'string') {
op.si = value
}
return this.submitOp([op], cb)
},
moveAt(path, from, to, cb) {
const op = [{ p: path.concat(from), lm: to }]
return this.submitOp(op, cb)
},
addAt(path, amount, cb) {
const op = [{ p: path, na: amount }]
return this.submitOp(op, cb)
},
deleteTextAt(path, length, pos, cb) {
const { elem, key } = traverse(this.snapshot, path)
const op = [{ p: path.concat(pos), sd: elem[key].slice(pos, pos + length) }]
return this.submitOp(op, cb)
},
addListener(path, event, cb) {
const l = { path, event, cb }
this._listeners.push(l)
return l
},
removeListener(l) {
const i = this._listeners.indexOf(l)
if (i < 0) {
return false
}
this._listeners.splice(i, 1)
return true
},
_register() {
this._listeners = []
this.on('change', function (op) {
return (() => {
const result = []
for (const c of Array.from(op)) {
let i
if (c.na !== undefined || c.si !== undefined || c.sd !== undefined) {
// no change to structure
continue
}
const to_remove = []
for (i = 0; i < this._listeners.length; i++) {
// Transform a dummy op by the incoming op to work out what
// should happen to the listener.
const l = this._listeners[i]
const dummy = { p: l.path, na: 0 }
const xformed = this.type.transformComponent([], dummy, c, 'left')
if (xformed.length === 0) {
// The op was transformed to noop, so we should delete the listener.
to_remove.push(i)
} else if (xformed.length === 1) {
// The op remained, so grab its new path into the listener.
l.path = xformed[0].p
} else {
throw new Error(
"Bad assumption in json-api: xforming an 'si' op will always result in 0 or 1 components."
)
}
}
to_remove.sort((a, b) => b - a)
result.push(
(() => {
const result1 = []
for (i of Array.from(to_remove)) {
result1.push(this._listeners.splice(i, 1))
}
return result1
})()
)
}
return result
})()
})
return this.on('remoteop', function (op) {
return (() => {
const result = []
for (const c of Array.from(op)) {
const match_path =
c.na === undefined ? c.p.slice(0, c.p.length - 1) : c.p
result.push(
(() => {
const result1 = []
for (const { path, event, cb } of Array.from(this._listeners)) {
let common
if (pathEquals(path, match_path)) {
switch (event) {
case 'insert':
if (c.li !== undefined && c.ld === undefined) {
result1.push(cb(c.p[c.p.length - 1], c.li))
} else if (c.oi !== undefined && c.od === undefined) {
result1.push(cb(c.p[c.p.length - 1], c.oi))
} else if (c.si !== undefined) {
result1.push(cb(c.p[c.p.length - 1], c.si))
} else {
result1.push(undefined)
}
break
case 'delete':
if (c.li === undefined && c.ld !== undefined) {
result1.push(cb(c.p[c.p.length - 1], c.ld))
} else if (c.oi === undefined && c.od !== undefined) {
result1.push(cb(c.p[c.p.length - 1], c.od))
} else if (c.sd !== undefined) {
result1.push(cb(c.p[c.p.length - 1], c.sd))
} else {
result1.push(undefined)
}
break
case 'replace':
if (c.li !== undefined && c.ld !== undefined) {
result1.push(cb(c.p[c.p.length - 1], c.ld, c.li))
} else if (c.oi !== undefined && c.od !== undefined) {
result1.push(cb(c.p[c.p.length - 1], c.od, c.oi))
} else {
result1.push(undefined)
}
break
case 'move':
if (c.lm !== undefined) {
result1.push(cb(c.p[c.p.length - 1], c.lm))
} else {
result1.push(undefined)
}
break
case 'add':
if (c.na !== undefined) {
result1.push(cb(c.na))
} else {
result1.push(undefined)
}
break
default:
result1.push(undefined)
}
} else if (
(common = this.type.commonPath(match_path, path)) != null
) {
if (event === 'child op') {
if (
match_path.length === path.length &&
path.length === common
) {
throw new Error(
"paths match length and have commonality, but aren't equal?"
)
}
const child_path = c.p.slice(common + 1)
result1.push(cb(child_path, c))
} else {
result1.push(undefined)
}
} else {
result1.push(undefined)
}
}
return result1
})()
)
}
return result
})()
})
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},
}