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import * as error from 'lib0/error'
import * as encoding from 'lib0/encoding'
import {
ID // eslint-disable-line
} from '../internals.js'
export class DSEncoderV1 {
constructor () {
this.restEncoder = encoding.createEncoder()
}
toUint8Array () {
return encoding.toUint8Array(this.restEncoder)
}
resetDsCurVal () {
// nop
}
/**
* @param {number} clock
*/
writeDsClock (clock) {
encoding.writeVarUint(this.restEncoder, clock)
}
/**
* @param {number} len
*/
writeDsLen (len) {
encoding.writeVarUint(this.restEncoder, len)
}
}
export class UpdateEncoderV1 extends DSEncoderV1 {
/**
* @param {ID} id
*/
writeLeftID (id) {
encoding.writeVarUint(this.restEncoder, id.client)
encoding.writeVarUint(this.restEncoder, id.clock)
}
/**
* @param {ID} id
*/
writeRightID (id) {
encoding.writeVarUint(this.restEncoder, id.client)
encoding.writeVarUint(this.restEncoder, id.clock)
}
/**
* Use writeClient and writeClock instead of writeID if possible.
* @param {number} client
*/
writeClient (client) {
encoding.writeVarUint(this.restEncoder, client)
}
/**
* @param {number} info An unsigned 8-bit integer
*/
writeInfo (info) {
encoding.writeUint8(this.restEncoder, info)
}
/**
* @param {string} s
*/
writeString (s) {
encoding.writeVarString(this.restEncoder, s)
}
/**
* @param {boolean} isYKey
*/
writeParentInfo (isYKey) {
encoding.writeVarUint(this.restEncoder, isYKey ? 1 : 0)
}
/**
* @param {number} info An unsigned 8-bit integer
*/
writeTypeRef (info) {
encoding.writeVarUint(this.restEncoder, info)
}
/**
* Write len of a struct - well suited for Opt RLE encoder.
*
* @param {number} len
*/
writeLen (len) {
encoding.writeVarUint(this.restEncoder, len)
}
/**
* @param {any} any
*/
writeAny (any) {
encoding.writeAny(this.restEncoder, any)
}
/**
* @param {Uint8Array} buf
*/
writeBuf (buf) {
encoding.writeVarUint8Array(this.restEncoder, buf)
}
/**
* @param {any} embed
*/
writeJSON (embed) {
encoding.writeVarString(this.restEncoder, JSON.stringify(embed))
}
/**
* @param {string} key
*/
writeKey (key) {
encoding.writeVarString(this.restEncoder, key)
}
}
export class DSEncoderV2 {
constructor () {
this.restEncoder = encoding.createEncoder() // encodes all the rest / non-optimized
this.dsCurrVal = 0
}
toUint8Array () {
return encoding.toUint8Array(this.restEncoder)
}
resetDsCurVal () {
this.dsCurrVal = 0
}
/**
* @param {number} clock
*/
writeDsClock (clock) {
const diff = clock - this.dsCurrVal
this.dsCurrVal = clock
encoding.writeVarUint(this.restEncoder, diff)
}
/**
* @param {number} len
*/
writeDsLen (len) {
if (len === 0) {
error.unexpectedCase()
}
encoding.writeVarUint(this.restEncoder, len - 1)
this.dsCurrVal += len
}
}
export class UpdateEncoderV2 extends DSEncoderV2 {
constructor () {
super()
/**
* @type {Map<string,number>}
*/
this.keyMap = new Map()
/**
* Refers to the next unique key-identifier to me used.
* See writeKey method for more information.
*
* @type {number}
*/
this.keyClock = 0
this.keyClockEncoder = new encoding.IntDiffOptRleEncoder()
this.clientEncoder = new encoding.UintOptRleEncoder()
this.leftClockEncoder = new encoding.IntDiffOptRleEncoder()
this.rightClockEncoder = new encoding.IntDiffOptRleEncoder()
this.infoEncoder = new encoding.RleEncoder(encoding.writeUint8)
this.stringEncoder = new encoding.StringEncoder()
this.parentInfoEncoder = new encoding.RleEncoder(encoding.writeUint8)
this.typeRefEncoder = new encoding.UintOptRleEncoder()
this.lenEncoder = new encoding.UintOptRleEncoder()
}
toUint8Array () {
const encoder = encoding.createEncoder()
encoding.writeVarUint(encoder, 0) // this is a feature flag that we might use in the future
encoding.writeVarUint8Array(encoder, this.keyClockEncoder.toUint8Array())
encoding.writeVarUint8Array(encoder, this.clientEncoder.toUint8Array())
encoding.writeVarUint8Array(encoder, this.leftClockEncoder.toUint8Array())
encoding.writeVarUint8Array(encoder, this.rightClockEncoder.toUint8Array())
encoding.writeVarUint8Array(encoder, encoding.toUint8Array(this.infoEncoder))
encoding.writeVarUint8Array(encoder, this.stringEncoder.toUint8Array())
encoding.writeVarUint8Array(encoder, encoding.toUint8Array(this.parentInfoEncoder))
encoding.writeVarUint8Array(encoder, this.typeRefEncoder.toUint8Array())
encoding.writeVarUint8Array(encoder, this.lenEncoder.toUint8Array())
// @note The rest encoder is appended! (note the missing var)
encoding.writeUint8Array(encoder, encoding.toUint8Array(this.restEncoder))
return encoding.toUint8Array(encoder)
}
/**
* @param {ID} id
*/
writeLeftID (id) {
this.clientEncoder.write(id.client)
this.leftClockEncoder.write(id.clock)
}
/**
* @param {ID} id
*/
writeRightID (id) {
this.clientEncoder.write(id.client)
this.rightClockEncoder.write(id.clock)
}
/**
* @param {number} client
*/
writeClient (client) {
this.clientEncoder.write(client)
}
/**
* @param {number} info An unsigned 8-bit integer
*/
writeInfo (info) {
this.infoEncoder.write(info)
}
/**
* @param {string} s
*/
writeString (s) {
this.stringEncoder.write(s)
}
/**
* @param {boolean} isYKey
*/
writeParentInfo (isYKey) {
this.parentInfoEncoder.write(isYKey ? 1 : 0)
}
/**
* @param {number} info An unsigned 8-bit integer
*/
writeTypeRef (info) {
this.typeRefEncoder.write(info)
}
/**
* Write len of a struct - well suited for Opt RLE encoder.
*
* @param {number} len
*/
writeLen (len) {
this.lenEncoder.write(len)
}
/**
* @param {any} any
*/
writeAny (any) {
encoding.writeAny(this.restEncoder, any)
}
/**
* @param {Uint8Array} buf
*/
writeBuf (buf) {
encoding.writeVarUint8Array(this.restEncoder, buf)
}
/**
* This is mainly here for legacy purposes.
*
* Initial we incoded objects using JSON. Now we use the much faster lib0/any-encoder. This method mainly exists for legacy purposes for the v1 encoder.
*
* @param {any} embed
*/
writeJSON (embed) {
encoding.writeAny(this.restEncoder, embed)
}
/**
* Property keys are often reused. For example, in y-prosemirror the key `bold` might
* occur very often. For a 3d application, the key `position` might occur very often.
*
* We cache these keys in a Map and refer to them via a unique number.
*
* @param {string} key
*/
writeKey (key) {
const clock = this.keyMap.get(key)
if (clock === undefined) {
/**
* @todo uncomment to introduce this feature finally
*
* Background. The ContentFormat object was always encoded using writeKey, but the decoder used to use readString.
* Furthermore, I forgot to set the keyclock. So everything was working fine.
*
* However, this feature here is basically useless as it is not being used (it actually only consumes extra memory).
*
* I don't know yet how to reintroduce this feature..
*
* Older clients won't be able to read updates when we reintroduce this feature. So this should probably be done using a flag.
*
*/
// this.keyMap.set(key, this.keyClock)
this.keyClockEncoder.write(this.keyClock++)
this.stringEncoder.write(key)
} else {
this.keyClockEncoder.write(clock)
}
}
}