mirror of
https://github.com/HeyPuter/puter
synced 2024-11-15 06:15:47 +00:00
116 lines
3.0 KiB
JavaScript
116 lines
3.0 KiB
JavaScript
/*
|
|
* Copyright (C) 2024 Puter Technologies Inc.
|
|
*
|
|
* This file is part of Phoenix Shell.
|
|
*
|
|
* Phoenix Shell is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as published
|
|
* by the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Affero General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Affero General Public License
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
export class DelegatingPStratumImplAPI {
|
|
constructor (facade) {
|
|
this.facade = facade;
|
|
}
|
|
get delegate () {
|
|
return this.facade.delegate;
|
|
}
|
|
}
|
|
|
|
export class DelegatingPStratumImplType {
|
|
constructor (facade) {
|
|
this.facade = facade;
|
|
}
|
|
getImplAPI () {
|
|
return new DelegatingPStratumImplAPI(this.facade);
|
|
}
|
|
}
|
|
|
|
export class TerminalPStratumImplType {
|
|
getImplAPI () {
|
|
return {};
|
|
}
|
|
}
|
|
|
|
export class PStratum {
|
|
constructor (impl) {
|
|
this.impl = impl;
|
|
|
|
const implTypeClass = this.impl.constructor.TYPE
|
|
?? DelegatingPStratumImplType;
|
|
|
|
this.implType = new implTypeClass(this);
|
|
this.api = this.implType.getImplAPI();
|
|
|
|
this.lookValue = null;
|
|
this.seqNo = 0;
|
|
|
|
this.history = [];
|
|
// TODO: make this configurable
|
|
this.historyOn = ! this.impl.reach;
|
|
}
|
|
|
|
setDelegate (delegate) {
|
|
this.delegate = delegate;
|
|
}
|
|
|
|
look () {
|
|
if ( this.looking ) {
|
|
return this.lookValue;
|
|
}
|
|
this.looking = true;
|
|
this.lookValue = this.impl.next(this.api);
|
|
return this.lookValue;
|
|
}
|
|
|
|
next () {
|
|
this.seqNo++;
|
|
let toReturn;
|
|
if ( this.looking ) {
|
|
this.looking = false;
|
|
toReturn = this.lookValue;
|
|
} else {
|
|
toReturn = this.impl.next(this.api);
|
|
}
|
|
this.history.push(toReturn.value);
|
|
return toReturn;
|
|
}
|
|
|
|
fork () {
|
|
const forkImpl = this.impl.fork(this.api);
|
|
const fork = new PStratum(forkImpl);
|
|
// DRY: sync state
|
|
fork.looking = this.looking;
|
|
fork.lookValue = this.lookValue;
|
|
fork.seqNo = this.seqNo;
|
|
fork.history = [...this.history];
|
|
return fork;
|
|
}
|
|
|
|
join (friend) {
|
|
// DRY: sync state
|
|
this.looking = friend.looking;
|
|
this.lookValue = friend.lookValue;
|
|
this.seqNo = friend.seqNo;
|
|
this.history = friend.history;
|
|
this.impl.join(this.api, friend.impl);
|
|
}
|
|
|
|
reach (start, end) {
|
|
if ( this.impl.reach ) {
|
|
return this.impl.reach(this.api, start, end)
|
|
}
|
|
if ( this.historyOn ) {
|
|
return this.history.slice(start, end);
|
|
}
|
|
}
|
|
}
|