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main.js
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import monaco from "./monaco.js";
import { emmetHTML, emmetCSS } from "emmet-monaco-es";
import {url_btoa, url_atob, deflate, inflate} from "./serialize.js";
const skeletonTemplate = `
<!DOCTYPE html>
<html>
<head>
<!-- in case this gets copypasta'd -->
<meta charset="utf-8">
<title>untitled</title>
</head>
<body>
<h1>Hello, World!</h1>
</body>
</html>
`.trim();
const skeletonSelection = {
startLineNumber: 9,
endLineNumber: 9,
startColumn: 2,
endColumn: Infinity, // this works, but isn't documented
};
const editorContainer = document.querySelector("#editor");
const frame = document.querySelector("iframe");
let editor;
const modalContainer = document.querySelector("#modalContainer");
document.querySelector("button[name=openModal]").addEventListener("click",
() => document.body.classList.remove("modalClosed")
);
modalContainer.addEventListener("click", ev => {
// ignore clicks inside #modal
if(ev.target !== ev.currentTarget)
return;
document.body.classList.add("modalClosed");
});
const settings = {
autoRefreshEnabled: document.querySelector("input[name=autoRefreshEnabled]"),
autoRefreshDelay: document.querySelector("input[name=autoRefreshDelay]"),
clearConsoleEnabled: document.querySelector("input[name=clearConsoleEnabled]"),
embedJSAsModule: document.querySelector("input[name=embedJSAsModule]"),
};
function debounce(delay, fn)
{
let timeout = null;
return () => {
if(timeout != null) clearTimeout(timeout);
timeout = setTimeout(() => {
timeout = null;
fn();
}, delay);
};
}
const tabs = document.querySelectorAll("#toolbar .tab");
function onKeydown(ev)
{
if(!document.body.classList.contains("modalClosed") && ev.code == "Escape")
{
document.body.classList.add("modalClosed");
return;
}
if(!ev.ctrlKey && !ev.metaKey) // metaKey is Cmd on Macs
return;
switch(ev.code)
{
case "Digit1":
// terrible hack assuming `switchTab` uses only `ev.target`
switchTab({ target: tabs[0] });
break;
case "Digit2":
switchTab({ target: tabs[1] });
break;
case "Digit3":
switchTab({ target: tabs[2] });
break;
case "KeyS":
save();
break;
case "KeyO":
load();
break;
default:
return;
}
ev.preventDefault();
editor.focus();
}
document.addEventListener("keydown", onKeydown);
const resourceBlobURLs = [];
function frameLoaded()
{
// events dispatched within iframes don't bubble up, and the document is reset every refresh
frame.contentDocument.addEventListener("keydown", onKeydown);
resourceBlobURLs.forEach(url => URL.revokeObjectURL(url));
resourceBlobURLs.length = 0;
}
frame.addEventListener("load", frameLoaded);
const models = {
html: null,
css: null,
js: null,
};
const domParser = new DOMParser();
const xmlSerializer = new XMLSerializer();
function refresh()
{
const newDoc = domParser.parseFromString(models.html.getValue(), "text/html");
const css = newDoc.createElement("link");
css.rel = "stylesheet";
css.href = URL.createObjectURL(new Blob([models.css.getValue()], { type: "text/css" }));
resourceBlobURLs.push(css.href);
newDoc.head.appendChild(css);
const js = newDoc.createElement("script");
js.type = settings.embedJSAsModule.checked ? "module" : "text/javascript";
js.src = URL.createObjectURL(new Blob([models.js.getValue()], { type: "text/javascript" }));
resourceBlobURLs.push(js.href);
newDoc.body.appendChild(js);
if(settings.clearConsoleEnabled.checked) console.clear();
frame.srcdoc = xmlSerializer.serializeToString(newDoc);
}
let currentModel = "html";
const modelStates = {
html: null,
css: null,
js: null,
};
function switchTab(ev)
{
tabs.forEach(e => e.classList.remove("selected"));
ev.target.classList.add("selected");
const newTab = ev.target.dataset.model;
if(!(newTab in models))
throw new Error(`Unknown model ${newTab}`);
if(newTab === currentModel)
return;
modelStates[currentModel] = editor.saveViewState();
editor.setModel(models[newTab]);
currentModel = newTab;
const state = modelStates[newTab];
if(state != null) editor.restoreViewState(state);
}
tabs.forEach(e => e.addEventListener("click", switchTab));
const autoRefreshCallbacks = {
html: null,
css: null,
js: null,
};
function resetAutoRefreshCallbacks()
{
let newDelay = parseInt(settings.autoRefreshDelay.value);
if(newDelay === NaN)
newDelay = settings.autoRefreshDelay.value = 1000;
const callback = debounce(newDelay, () => {
// for simplicity, always register callbacks but ignore them when not auto-refreshing
if(!settings.autoRefreshEnabled.checked) return;
refresh();
});
for(let model in autoRefreshCallbacks)
{
const disposable = autoRefreshCallbacks[model];
if(disposable !== null) disposable.dispose();
autoRefreshCallbacks[model] = models[model].onDidChangeContent(callback);
}
}
settings.autoRefreshDelay.addEventListener("input", resetAutoRefreshCallbacks);
async function save()
{
let state = {
html: models.html.getValue(),
css: models.css.getValue(),
js: models.js.getValue(),
};
state = JSON.stringify(state);
state = await deflate(state);
state = url_btoa(state);
let url = new URL(document.location);
url.search = state;
prompt("Copy/paste this", url);
}
document.querySelector("button[name=save]").addEventListener("click", () => save());
async function load(state = null)
{
if(state === null)
{
state = prompt("Paste a previously saved URL");
if(state === null) return;
state = state.substring(state.indexOf("?") + 1);
}
state = url_atob(decodeURIComponent(state));
state = await inflate(state);
let {html, css, js} = JSON.parse(state);
models.html.setValue(html);
models.css.setValue(css);
models.js.setValue(js);
refresh();
}
document.querySelector("button[name=load]").addEventListener("click", () => load());
import HTMLWorker from "url:monaco-editor/esm/vs/language/html/html.worker.js";
import CSSWorker from "url:monaco-editor/esm/vs/language/css/css.worker.js";
import TSWorker from "url:monaco-editor/esm/vs/language/typescript/ts.worker.js";
import EditorWorker from "url:monaco-editor/esm/vs/editor/editor.worker.js";
globalThis.MonacoEnvironment = {
getWorkerUrl: function(moduleId, label) {
switch(label) {
case "html":
return HTMLWorker;
case "css":
return CSSWorker;
case "javascript":
return TSWorker;
default:
return EditorWorker;
}
},
};
async function main()
{
emmetHTML(monaco, ["html"]);
emmetCSS(monaco, ["css"]);
models.html = monaco.editor.createModel(skeletonTemplate, "html");
models.css = monaco.editor.createModel("", "css");
models.js = monaco.editor.createModel("", "javascript");
editor = monaco.editor.create(editorContainer, {
model: models.html,
theme: "vs-dark",
minimap: { enabled: false },
insertSpaces: false,
autoIndent: "full",
});
new ResizeObserver(debounce(100, editor.layout.bind(editor))).observe(editorContainer);
resetAutoRefreshCallbacks();
editor.addCommand(monaco.KeyMod.CtrlCmd | monaco.KeyCode.Enter, refresh);
editor.revealRangeInCenter(skeletonSelection);
editor.setSelection(skeletonSelection);
editor.focus();
const query = document.location.search;
if(query.length > 1)
load(query.substring(1));
else
refresh();
}
document.addEventListener("DOMContentLoaded", main);