96 lines
2.1 KiB
JavaScript
96 lines
2.1 KiB
JavaScript
"use strict";
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const Immutable = require('immutable');
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const Dataspace = require('./dataspace.js').Dataspace;
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function Ground(bootProc) {
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Dataspace.call(this, bootProc);
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this.stepperId = null;
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this.stepping = false;
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this.startingFuel = 1000;
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this.stopHandlers = [];
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this.backgroundTaskCount = 0;
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if (typeof window !== 'undefined') {
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window._ground = this;
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}
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}
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Ground.prototype = new Dataspace(null);
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Ground._resolved = Promise.resolve();
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Ground.laterCall = function (thunk) {
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Ground._resolved.then(thunk);
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};
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Ground.prototype.backgroundTask = function (k) {
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const ground = this;
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let active = true;
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ground.backgroundTaskCount++;
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function finish() {
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if (active) {
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ground.backgroundTaskCount--;
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active = false;
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}
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}
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return k ? k(finish) : finish;
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};
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Ground.prototype.start = function () {
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if (!this.stepperId) {
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this.stepperId = Ground.laterCall(() => {
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this.stepperId = null;
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this._step();
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});
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}
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return this; // allows chaining start() immediately after construction
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};
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Ground.prototype.ground = function () {
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return this;
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};
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Ground.prototype._step = function () {
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this.stepping = true;
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try {
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let stillBusy = false;
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for (var fuel = this.startingFuel; fuel > 0; fuel--) {
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stillBusy = this.runScripts();
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if (!stillBusy) break;
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}
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if (stillBusy) {
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this.start();
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} else {
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if (!this.backgroundTaskCount) {
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this.stopHandlers.forEach((h) => h());
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this.stopHandlers = [];
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}
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}
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} finally {
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this.stepping = false;
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}
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};
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Ground.prototype.stop = function () {
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if (this.stepperId) {
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clearTimeout(this.stepperId);
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this.stepperId = null;
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}
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};
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Ground.prototype.addStopHandler = function (h) {
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this.stopHandlers.push(h);
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};
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function bootModule(mod) {
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let g = new Ground(() => {
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Dataspace.activate(mod.exports);
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});
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if (typeof document !== 'undefined') {
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document.addEventListener("DOMContentLoaded", (e) => { g.start(); });
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} else {
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g.start();
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}
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}
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module.exports.Ground = Ground;
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module.exports.bootModule = bootModule;
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