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// This is a minimal headless SqueakJS VM
//
// The headless SqueakJS VM can be used inside a browser.
// The VM can run in the main (UI) thread or in a WebWorker thread. Some browsers
// do not support ES6 modules yet for WebWorker scripts. Please use or create
// a Javascript bundle of the VM in that case.
//
// A special ConsolePlugin is loaded which allows sending messages to the console.
// Add the following method to the Smalltalk image (to Object for example):
//
// primLog: messageString level: levelString
//
// "Log messageString to the console. The specified level should be one of:
// 'log'
// 'info'
// 'warn'
// 'error'
// "
//
// <primitive: 'primitiveLog:level:' module: 'ConsolePlugin'>
// ^ self
//
//
// There is no default file support loaded. If needed add the relevant modules/plugins like:
// import "./vm.files.browser.js";
// import "./vm.plugins.file.browser.js";
// Load VM and the internal plugins
import "./globals.js";
import "./vm.js";
import "./vm.object.js";
import "./vm.object.spur.js";
import "./vm.image.js";
import "./vm.interpreter.js";
import "./vm.interpreter.proxy.js";
import "./vm.instruction.stream.js";
import "./vm.instruction.stream.sista.js";
import "./vm.instruction.printer.js";
import "./vm.primitives.js";
import "./jit.js";
import "./vm.display.js";
import "./vm.display.headless.js"; // use headless display to prevent image crashing/becoming unresponsive
import "./vm.input.js";
import "./vm.input.headless.js"; // use headless input to prevent image crashing/becoming unresponsive
import "./vm.plugins.js";
import "./plugins/ConsolePlugin.js";
// Run image by starting interpreter on it
function runImage(imageData, imageName, options) {
// Create Squeak image from raw data
var image = new Squeak.Image(imageName.replace(/\.image$/i, ""));
image.readFromBuffer(imageData, function startRunning() {
// Create fake display and create interpreter
var display = { vmOptions: [ "-vm-display-null", "-nodisplay" ] };
var vm = new Squeak.Interpreter(image, display);
function run() {
try {
vm.interpret(50, function runAgain(ms) {
// Ignore display.quitFlag when requested.
// Some Smalltalk images quit when no display is found.
if (options.ignoreQuit || !display.quitFlag) {
setTimeout(run, ms === "sleep" ? 10 : ms);
}
});
} catch(e) {
console.error("Failure during Squeak run: ", e);
}
}
// Start the interpreter
run();
});
}
function fetchImageAndRun(imageName, options) {
fetch(imageName, {
method: "GET",
mode: "cors",
cache: "no-store"
}).then(function(response) {
if (!response.ok) {
throw new Error("Response not OK: " + response.status);
}
return response.arrayBuffer();
}).then(function(imageData) {
runImage(imageData, imageName, options);
}).catch(function(error) {
console.error("Failed to retrieve image", error);
});
}
// Extend Squeak with settings and options to fetch and run image
Object.extend(Squeak, {
vmPath: "/",
platformSubtype: "Browser",
osVersion: navigator.userAgent, // might want to parse
windowSystem: "headless",
fetchImageAndRun: fetchImageAndRun,
});
// Retrieve image name from URL
var searchParams = (new URL(self.location)).searchParams;
var imageName = searchParams.get("imageName");
if (imageName) {
var options = {
ignoreQuit: searchParams.get("ignoreQuit") !== null
};
fetchImageAndRun(imageName, options);
}
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