Noah Petherbridge
07cefb6499
* New and completed widgets: Menu, MenuButton and MenuBar.
* MenuButton is a kind of Button that opens a popup Menu when clicked.
* MenuBar is a container of buttons designed to be attached to the top
of an application window ("File, Edit, View, Help")
* Supervisor manages the popup menus with its new concept of a Modal
Widget. Modal widgets take exclusive event priority for all mouse and
key events. The pop-up menu is a modal window, which means you must
click an option inside the menu OR clicking outside the menu will
close it and eat your click event (widgets outside the modal don't
receive events, but the modal itself gets an event that you've done
this).
592 lines
17 KiB
JavaScript
592 lines
17 KiB
JavaScript
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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(() => {
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// Map multiple JavaScript environments to a single common API,
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// preferring web standards over Node.js API.
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//
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// Environments considered:
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// - Browsers
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// - Node.js
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// - Electron
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// - Parcel
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if (typeof global !== "undefined") {
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// global already exists
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} else if (typeof window !== "undefined") {
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window.global = window;
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} else if (typeof self !== "undefined") {
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self.global = self;
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} else {
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throw new Error("cannot export Go (neither global, window nor self is defined)");
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}
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if (!global.require && typeof require !== "undefined") {
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global.require = require;
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}
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if (!global.fs && global.require) {
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global.fs = require("fs");
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}
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const enosys = () => {
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const err = new Error("not implemented");
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err.code = "ENOSYS";
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return err;
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};
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if (!global.fs) {
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let outputBuf = "";
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global.fs = {
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constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused
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writeSync(fd, buf) {
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outputBuf += decoder.decode(buf);
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const nl = outputBuf.lastIndexOf("\n");
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if (nl != -1) {
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console.log(outputBuf.substr(0, nl));
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outputBuf = outputBuf.substr(nl + 1);
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}
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return buf.length;
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},
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write(fd, buf, offset, length, position, callback) {
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if (offset !== 0 || length !== buf.length || position !== null) {
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callback(enosys());
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return;
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}
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const n = this.writeSync(fd, buf);
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callback(null, n);
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},
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chmod(path, mode, callback) { callback(enosys()); },
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chown(path, uid, gid, callback) { callback(enosys()); },
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close(fd, callback) { callback(enosys()); },
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fchmod(fd, mode, callback) { callback(enosys()); },
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fchown(fd, uid, gid, callback) { callback(enosys()); },
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fstat(fd, callback) { callback(enosys()); },
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fsync(fd, callback) { callback(null); },
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ftruncate(fd, length, callback) { callback(enosys()); },
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lchown(path, uid, gid, callback) { callback(enosys()); },
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link(path, link, callback) { callback(enosys()); },
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lstat(path, callback) { callback(enosys()); },
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mkdir(path, perm, callback) { callback(enosys()); },
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open(path, flags, mode, callback) { callback(enosys()); },
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read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
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readdir(path, callback) { callback(enosys()); },
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readlink(path, callback) { callback(enosys()); },
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rename(from, to, callback) { callback(enosys()); },
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rmdir(path, callback) { callback(enosys()); },
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stat(path, callback) { callback(enosys()); },
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symlink(path, link, callback) { callback(enosys()); },
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truncate(path, length, callback) { callback(enosys()); },
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unlink(path, callback) { callback(enosys()); },
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utimes(path, atime, mtime, callback) { callback(enosys()); },
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};
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}
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if (!global.process) {
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global.process = {
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getuid() { return -1; },
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getgid() { return -1; },
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geteuid() { return -1; },
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getegid() { return -1; },
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getgroups() { throw enosys(); },
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pid: -1,
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ppid: -1,
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umask() { throw enosys(); },
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cwd() { throw enosys(); },
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chdir() { throw enosys(); },
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}
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}
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if (!global.crypto) {
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const nodeCrypto = require("crypto");
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global.crypto = {
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getRandomValues(b) {
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nodeCrypto.randomFillSync(b);
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},
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};
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}
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if (!global.performance) {
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global.performance = {
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now() {
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const [sec, nsec] = process.hrtime();
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return sec * 1000 + nsec / 1000000;
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},
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};
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}
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if (!global.TextEncoder) {
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global.TextEncoder = require("util").TextEncoder;
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}
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if (!global.TextDecoder) {
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global.TextDecoder = require("util").TextDecoder;
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}
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// End of polyfills for common API.
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const encoder = new TextEncoder("utf-8");
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const decoder = new TextDecoder("utf-8");
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global.Go = class {
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constructor() {
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this.argv = ["js"];
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this.env = {};
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this.exit = (code) => {
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if (code !== 0) {
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console.warn("exit code:", code);
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}
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};
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this._exitPromise = new Promise((resolve) => {
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this._resolveExitPromise = resolve;
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});
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this._pendingEvent = null;
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this._scheduledTimeouts = new Map();
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this._nextCallbackTimeoutID = 1;
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const setInt64 = (addr, v) => {
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this.mem.setUint32(addr + 0, v, true);
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this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true);
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}
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const getInt64 = (addr) => {
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const low = this.mem.getUint32(addr + 0, true);
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const high = this.mem.getInt32(addr + 4, true);
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return low + high * 4294967296;
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}
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const loadValue = (addr) => {
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const f = this.mem.getFloat64(addr, true);
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if (f === 0) {
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return undefined;
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}
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if (!isNaN(f)) {
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return f;
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}
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const id = this.mem.getUint32(addr, true);
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return this._values[id];
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}
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const storeValue = (addr, v) => {
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const nanHead = 0x7FF80000;
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if (typeof v === "number") {
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if (isNaN(v)) {
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this.mem.setUint32(addr + 4, nanHead, true);
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this.mem.setUint32(addr, 0, true);
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return;
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}
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if (v === 0) {
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this.mem.setUint32(addr + 4, nanHead, true);
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this.mem.setUint32(addr, 1, true);
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return;
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}
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this.mem.setFloat64(addr, v, true);
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return;
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}
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switch (v) {
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case undefined:
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this.mem.setFloat64(addr, 0, true);
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return;
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case null:
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this.mem.setUint32(addr + 4, nanHead, true);
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this.mem.setUint32(addr, 2, true);
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return;
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case true:
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this.mem.setUint32(addr + 4, nanHead, true);
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this.mem.setUint32(addr, 3, true);
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return;
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case false:
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this.mem.setUint32(addr + 4, nanHead, true);
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this.mem.setUint32(addr, 4, true);
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return;
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}
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let id = this._ids.get(v);
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if (id === undefined) {
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id = this._idPool.pop();
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if (id === undefined) {
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id = this._values.length;
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}
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this._values[id] = v;
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this._goRefCounts[id] = 0;
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this._ids.set(v, id);
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}
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this._goRefCounts[id]++;
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let typeFlag = 1;
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switch (typeof v) {
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case "string":
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typeFlag = 2;
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break;
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case "symbol":
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typeFlag = 3;
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break;
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case "function":
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typeFlag = 4;
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break;
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}
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this.mem.setUint32(addr + 4, nanHead | typeFlag, true);
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this.mem.setUint32(addr, id, true);
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}
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const loadSlice = (addr) => {
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const array = getInt64(addr + 0);
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const len = getInt64(addr + 8);
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return new Uint8Array(this._inst.exports.mem.buffer, array, len);
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}
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const loadSliceOfValues = (addr) => {
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const array = getInt64(addr + 0);
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const len = getInt64(addr + 8);
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const a = new Array(len);
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for (let i = 0; i < len; i++) {
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a[i] = loadValue(array + i * 8);
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}
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return a;
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}
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const loadString = (addr) => {
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const saddr = getInt64(addr + 0);
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const len = getInt64(addr + 8);
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return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len));
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}
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const timeOrigin = Date.now() - performance.now();
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this.importObject = {
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go: {
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// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
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// may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
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// function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
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// This changes the SP, thus we have to update the SP used by the imported function.
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// func wasmExit(code int32)
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"runtime.wasmExit": (sp) => {
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const code = this.mem.getInt32(sp + 8, true);
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this.exited = true;
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delete this._inst;
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delete this._values;
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delete this._goRefCounts;
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delete this._ids;
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delete this._idPool;
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this.exit(code);
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},
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// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
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"runtime.wasmWrite": (sp) => {
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const fd = getInt64(sp + 8);
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const p = getInt64(sp + 16);
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const n = this.mem.getInt32(sp + 24, true);
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fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
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},
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// func resetMemoryDataView()
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"runtime.resetMemoryDataView": (sp) => {
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this.mem = new DataView(this._inst.exports.mem.buffer);
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},
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// func nanotime1() int64
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"runtime.nanotime1": (sp) => {
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setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
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},
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// func walltime1() (sec int64, nsec int32)
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"runtime.walltime1": (sp) => {
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const msec = (new Date).getTime();
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setInt64(sp + 8, msec / 1000);
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this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
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},
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// func scheduleTimeoutEvent(delay int64) int32
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"runtime.scheduleTimeoutEvent": (sp) => {
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const id = this._nextCallbackTimeoutID;
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this._nextCallbackTimeoutID++;
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this._scheduledTimeouts.set(id, setTimeout(
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() => {
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this._resume();
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while (this._scheduledTimeouts.has(id)) {
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// for some reason Go failed to register the timeout event, log and try again
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// (temporary workaround for https://github.com/golang/go/issues/28975)
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console.warn("scheduleTimeoutEvent: missed timeout event");
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this._resume();
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}
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},
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getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early
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));
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this.mem.setInt32(sp + 16, id, true);
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},
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// func clearTimeoutEvent(id int32)
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"runtime.clearTimeoutEvent": (sp) => {
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const id = this.mem.getInt32(sp + 8, true);
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clearTimeout(this._scheduledTimeouts.get(id));
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this._scheduledTimeouts.delete(id);
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},
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// func getRandomData(r []byte)
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"runtime.getRandomData": (sp) => {
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crypto.getRandomValues(loadSlice(sp + 8));
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},
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// func finalizeRef(v ref)
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"syscall/js.finalizeRef": (sp) => {
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const id = this.mem.getUint32(sp + 8, true);
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this._goRefCounts[id]--;
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if (this._goRefCounts[id] === 0) {
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const v = this._values[id];
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this._values[id] = null;
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this._ids.delete(v);
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this._idPool.push(id);
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}
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},
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// func stringVal(value string) ref
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"syscall/js.stringVal": (sp) => {
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storeValue(sp + 24, loadString(sp + 8));
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},
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// func valueGet(v ref, p string) ref
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"syscall/js.valueGet": (sp) => {
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const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16));
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sp = this._inst.exports.getsp(); // see comment above
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storeValue(sp + 32, result);
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},
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// func valueSet(v ref, p string, x ref)
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"syscall/js.valueSet": (sp) => {
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Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
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},
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// func valueDelete(v ref, p string)
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"syscall/js.valueDelete": (sp) => {
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Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16));
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},
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// func valueIndex(v ref, i int) ref
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"syscall/js.valueIndex": (sp) => {
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storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
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},
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// valueSetIndex(v ref, i int, x ref)
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"syscall/js.valueSetIndex": (sp) => {
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Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24));
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},
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// func valueCall(v ref, m string, args []ref) (ref, bool)
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"syscall/js.valueCall": (sp) => {
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try {
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const v = loadValue(sp + 8);
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const m = Reflect.get(v, loadString(sp + 16));
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const args = loadSliceOfValues(sp + 32);
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const result = Reflect.apply(m, v, args);
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sp = this._inst.exports.getsp(); // see comment above
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storeValue(sp + 56, result);
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this.mem.setUint8(sp + 64, 1);
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} catch (err) {
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storeValue(sp + 56, err);
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this.mem.setUint8(sp + 64, 0);
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}
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},
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// func valueInvoke(v ref, args []ref) (ref, bool)
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"syscall/js.valueInvoke": (sp) => {
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try {
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const v = loadValue(sp + 8);
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const args = loadSliceOfValues(sp + 16);
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const result = Reflect.apply(v, undefined, args);
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sp = this._inst.exports.getsp(); // see comment above
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storeValue(sp + 40, result);
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this.mem.setUint8(sp + 48, 1);
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} catch (err) {
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storeValue(sp + 40, err);
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this.mem.setUint8(sp + 48, 0);
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}
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},
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// func valueNew(v ref, args []ref) (ref, bool)
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"syscall/js.valueNew": (sp) => {
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try {
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const v = loadValue(sp + 8);
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const args = loadSliceOfValues(sp + 16);
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const result = Reflect.construct(v, args);
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sp = this._inst.exports.getsp(); // see comment above
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storeValue(sp + 40, result);
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this.mem.setUint8(sp + 48, 1);
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} catch (err) {
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storeValue(sp + 40, err);
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this.mem.setUint8(sp + 48, 0);
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}
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},
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// func valueLength(v ref) int
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"syscall/js.valueLength": (sp) => {
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setInt64(sp + 16, parseInt(loadValue(sp + 8).length));
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},
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// valuePrepareString(v ref) (ref, int)
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"syscall/js.valuePrepareString": (sp) => {
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const str = encoder.encode(String(loadValue(sp + 8)));
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storeValue(sp + 16, str);
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setInt64(sp + 24, str.length);
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},
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// valueLoadString(v ref, b []byte)
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"syscall/js.valueLoadString": (sp) => {
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const str = loadValue(sp + 8);
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loadSlice(sp + 16).set(str);
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},
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// func valueInstanceOf(v ref, t ref) bool
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"syscall/js.valueInstanceOf": (sp) => {
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this.mem.setUint8(sp + 24, loadValue(sp + 8) instanceof loadValue(sp + 16));
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},
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// func copyBytesToGo(dst []byte, src ref) (int, bool)
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"syscall/js.copyBytesToGo": (sp) => {
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const dst = loadSlice(sp + 8);
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const src = loadValue(sp + 32);
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if (!(src instanceof Uint8Array)) {
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this.mem.setUint8(sp + 48, 0);
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return;
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}
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const toCopy = src.subarray(0, dst.length);
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dst.set(toCopy);
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setInt64(sp + 40, toCopy.length);
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this.mem.setUint8(sp + 48, 1);
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},
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// func copyBytesToJS(dst ref, src []byte) (int, bool)
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"syscall/js.copyBytesToJS": (sp) => {
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const dst = loadValue(sp + 8);
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const src = loadSlice(sp + 16);
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if (!(dst instanceof Uint8Array)) {
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this.mem.setUint8(sp + 48, 0);
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return;
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}
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const toCopy = src.subarray(0, dst.length);
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dst.set(toCopy);
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setInt64(sp + 40, toCopy.length);
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this.mem.setUint8(sp + 48, 1);
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},
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"debug": (value) => {
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console.log(value);
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},
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}
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};
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}
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async run(instance) {
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this._inst = instance;
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this.mem = new DataView(this._inst.exports.mem.buffer);
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this._values = [ // JS values that Go currently has references to, indexed by reference id
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NaN,
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0,
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null,
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true,
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false,
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global,
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this,
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];
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this._goRefCounts = []; // number of references that Go has to a JS value, indexed by reference id
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this._ids = new Map(); // mapping from JS values to reference ids
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|
this._idPool = []; // unused ids that have been garbage collected
|
|
this.exited = false; // whether the Go program has exited
|
|
|
|
// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
|
|
let offset = 4096;
|
|
|
|
const strPtr = (str) => {
|
|
const ptr = offset;
|
|
const bytes = encoder.encode(str + "\0");
|
|
new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes);
|
|
offset += bytes.length;
|
|
if (offset % 8 !== 0) {
|
|
offset += 8 - (offset % 8);
|
|
}
|
|
return ptr;
|
|
};
|
|
|
|
const argc = this.argv.length;
|
|
|
|
const argvPtrs = [];
|
|
this.argv.forEach((arg) => {
|
|
argvPtrs.push(strPtr(arg));
|
|
});
|
|
argvPtrs.push(0);
|
|
|
|
const keys = Object.keys(this.env).sort();
|
|
keys.forEach((key) => {
|
|
argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
|
|
});
|
|
argvPtrs.push(0);
|
|
|
|
const argv = offset;
|
|
argvPtrs.forEach((ptr) => {
|
|
this.mem.setUint32(offset, ptr, true);
|
|
this.mem.setUint32(offset + 4, 0, true);
|
|
offset += 8;
|
|
});
|
|
|
|
this._inst.exports.run(argc, argv);
|
|
if (this.exited) {
|
|
this._resolveExitPromise();
|
|
}
|
|
await this._exitPromise;
|
|
}
|
|
|
|
_resume() {
|
|
if (this.exited) {
|
|
throw new Error("Go program has already exited");
|
|
}
|
|
this._inst.exports.resume();
|
|
if (this.exited) {
|
|
this._resolveExitPromise();
|
|
}
|
|
}
|
|
|
|
_makeFuncWrapper(id) {
|
|
const go = this;
|
|
return function () {
|
|
const event = { id: id, this: this, args: arguments };
|
|
go._pendingEvent = event;
|
|
go._resume();
|
|
return event.result;
|
|
};
|
|
}
|
|
}
|
|
|
|
if (
|
|
global.require &&
|
|
global.require.main === module &&
|
|
global.process &&
|
|
global.process.versions &&
|
|
!global.process.versions.electron
|
|
) {
|
|
if (process.argv.length < 3) {
|
|
console.error("usage: go_js_wasm_exec [wasm binary] [arguments]");
|
|
process.exit(1);
|
|
}
|
|
|
|
const go = new Go();
|
|
go.argv = process.argv.slice(2);
|
|
go.env = Object.assign({ TMPDIR: require("os").tmpdir() }, process.env);
|
|
go.exit = process.exit;
|
|
WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => {
|
|
process.on("exit", (code) => { // Node.js exits if no event handler is pending
|
|
if (code === 0 && !go.exited) {
|
|
// deadlock, make Go print error and stack traces
|
|
go._pendingEvent = { id: 0 };
|
|
go._resume();
|
|
}
|
|
});
|
|
return go.run(result.instance);
|
|
}).catch((err) => {
|
|
console.error(err);
|
|
process.exit(1);
|
|
});
|
|
}
|
|
})();
|