mirror of
https://github.com/HeyPuter/puter
synced 2024-11-14 22:06:00 +00:00
116 lines
3.0 KiB
JavaScript
116 lines
3.0 KiB
JavaScript
/*
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* Copyright (C) 2024 Puter Technologies Inc.
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*
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* This file is part of Phoenix Shell.
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*
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* Phoenix Shell is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published
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* by the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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export class DelegatingPStratumImplAPI {
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constructor (facade) {
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this.facade = facade;
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}
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get delegate () {
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return this.facade.delegate;
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}
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}
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export class DelegatingPStratumImplType {
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constructor (facade) {
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this.facade = facade;
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}
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getImplAPI () {
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return new DelegatingPStratumImplAPI(this.facade);
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}
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}
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export class TerminalPStratumImplType {
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getImplAPI () {
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return {};
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}
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}
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export class PStratum {
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constructor (impl) {
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this.impl = impl;
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const implTypeClass = this.impl.constructor.TYPE
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?? DelegatingPStratumImplType;
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this.implType = new implTypeClass(this);
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this.api = this.implType.getImplAPI();
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this.lookValue = null;
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this.seqNo = 0;
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this.history = [];
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// TODO: make this configurable
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this.historyOn = ! this.impl.reach;
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}
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setDelegate (delegate) {
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this.delegate = delegate;
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}
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look () {
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if ( this.looking ) {
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return this.lookValue;
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}
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this.looking = true;
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this.lookValue = this.impl.next(this.api);
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return this.lookValue;
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}
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next () {
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this.seqNo++;
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let toReturn;
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if ( this.looking ) {
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this.looking = false;
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toReturn = this.lookValue;
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} else {
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toReturn = this.impl.next(this.api);
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}
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this.history.push(toReturn.value);
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return toReturn;
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}
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fork () {
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const forkImpl = this.impl.fork(this.api);
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const fork = new PStratum(forkImpl);
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// DRY: sync state
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fork.looking = this.looking;
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fork.lookValue = this.lookValue;
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fork.seqNo = this.seqNo;
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fork.history = [...this.history];
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return fork;
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}
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join (friend) {
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// DRY: sync state
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this.looking = friend.looking;
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this.lookValue = friend.lookValue;
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this.seqNo = friend.seqNo;
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this.history = friend.history;
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this.impl.join(this.api, friend.impl);
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}
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reach (start, end) {
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if ( this.impl.reach ) {
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return this.impl.reach(this.api, start, end)
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}
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if ( this.historyOn ) {
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return this.history.slice(start, end);
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}
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}
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}
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