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https://github.com/MercuryWorkshop/dreamlandjs.git
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CoolElectronics
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466
AliceJS.js
Normal file
466
AliceJS.js
Normal file
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// The global list of "references", as captured by the proxy in stateful
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let __reference_stack = [];
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// We add some extra properties into various objects throughout, better to use symbols and not interfere
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let ALICEJS_REFERENCES_MAPPING = Symbol();
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let ALICEJS_REFERENCES_MARKER = Symbol();
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let ALICEJS_STATEFUL_LISTENERS = Symbol();
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// Say you have some code like
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//// let state = stateful({
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//// a: 1
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//// })
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//// let elm = <p>{window.use(state.a)}</p>
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//
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// According to the standard, the order of events is as follows:
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// - the getter for window.use gets called, setting __reference_stack to an empty list
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// - the proxy for state.a is triggered, pushing { state, "a", Proxy(state) } onto __reference_stack
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// - the function that the getter returns is called, popping everything off the stack
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// - the JSX factory h() is now passed the *reference* of state.a, not the value
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Object.defineProperty(window, "use", {
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get: () => {
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__reference_stack = [];
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return (_sink, mapping) => {
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let references = __reference_stack;
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__reference_stack = [];
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references[ALICEJS_REFERENCES_MARKER] = true;
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if (mapping) references[ALICEJS_REFERENCES_MAPPING] = mapping;
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return references;
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};
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}
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});
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Object.assign(window, { h, stateful, handle, css, styled: { new: css } });
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// This wraps the target in a proxy, doing 2 things:
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// - whenever a property is accessed, update the reference stack
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// - whenever a property is set, notify the subscribed listeners
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// This is what makes our "pass-by-reference" magic work
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export function stateful(target) {
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target[ALICEJS_STATEFUL_LISTENERS] = [];
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const proxy = new Proxy(target, {
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get(target, property, proxy) {
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__reference_stack.push({ target, property, proxy });
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return Reflect.get(target, property, proxy);
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},
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set(target, property, val) {
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for (const listener of target[ALICEJS_STATEFUL_LISTENERS]) {
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listener(target, property, val);
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}
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return Reflect.set(target, property, val);
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},
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});
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return proxy;
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}
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function isAJSReferences(arr) {
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return arr instanceof Array && ALICEJS_REFERENCES_MARKER in arr
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}
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// This lets you subscribe to a stateful object
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export function handle(references, callback) {
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if (!isAJSReferences(references))
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throw new Error("Not an AliceJS reference set!");
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if (ALICEJS_REFERENCES_MAPPING in references) {
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const mapping = references[ALICEJS_REFERENCES_MAPPING];
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const used_props = [];
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const used_targets = [];
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const values = new Map();
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const pairs = [];
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const partial_update = (target, prop, val) => {
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if (used_props.includes(prop) && used_targets.includes(target)) {
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values.get(target)[prop] = val;
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}
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};
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const full_update = () => {
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const flattened_values = pairs.map(
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(pair) => values.get(pair[0])[pair[1]],
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);
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const value = mapping(...flattened_values);
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callback(value);
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};
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for (const p of references) {
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const target = p.target;
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const prop = p.property;
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used_props.push(prop);
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used_targets.push(target);
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pairs.push([target, prop]);
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if (!values.has(target)) {
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values.set(target, {});
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}
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partial_update(target, prop, target[prop]);
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target[ALICEJS_STATEFUL_LISTENERS].push((t, p, v) => {
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partial_update(t, p, v);
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full_update();
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});
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}
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full_update();
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} else {
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const reference = references[references.length - 1];
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const subscription = (target, prop, val) => {
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if (prop === reference.property && target === reference.target) {
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callback(val);
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}
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};
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reference.target[ALICEJS_STATEFUL_LISTENERS].push(subscription);
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subscription(reference.target, reference.property, reference.target[reference.property]);
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}
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}
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// Actual JSX factory. Responsible for creating the HTML elements and all of the *reactive* syntactic sugar
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export function h(type, props, ...children) {
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if (typeof type === "function") {
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let newthis = stateful({});
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let component = type.bind(newthis);
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return component();
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}
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const elm = document.createElement(type);
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function addChild(child) {
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if (isAJSReferences(child)) {
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let appended = [];
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handle(child, (val) => {
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if (appended.length > 1) {
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// this is why we don't encourage arrays (jank)
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appended.forEach(n => n.remove());
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appended = addChild(val);
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} else if (appended.length > 0) {
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appended[0].replaceWith((appended = addChild(val))[0]);
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} else {
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appended = addChild(val);
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}
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});
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} else if (child instanceof Node) {
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elm.appendChild(child);
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return [child];
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} else if (child instanceof Array) {
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let elms = [];
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for (const childchild of child) {
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elms = elms.concat(addChild(childchild));
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}
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return elms;
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} else {
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let node = document.createTextNode(child);
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elm.appendChild(node);
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return [node];
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}
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}
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for (const child of children) {
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addChild(child);
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}
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if (!props) return elm;
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function useProp(name, callback) {
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if (!(name in props)) return;
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let prop = props[name];
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callback(prop);
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delete props[name];
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}
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// insert an element at the start
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useProp("before", callback => {
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addChild(callback());
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})
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useProp("css", classname => {
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elm.classList.add(classname);
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elm.classList.add("self");
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});
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// if/then/else syntax
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useProp("if", condition => {
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let thenblock = props["then"];
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let elseblock = props["else"];
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if (isAJSReferences(condition)) {
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if (thenblock) elm.appendChild(thenblock);
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if (elseblock) elm.appendChild(elseblock);
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handle(condition, val => {
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if (thenblock) {
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if (val) {
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thenblock.style.display = "";
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if (elseblock) elseblock.style.display = "none";
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} else {
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thenblock.style.display = "none";
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if (elseblock) elseblock.style.display = "";
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}
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} else {
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if (val) {
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elm.style.display = "";
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} else {
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elm.style.display = "none";
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}
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}
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});
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} else {
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if (thenblock) {
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if (condition) {
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elm.appendChild(thenblock);
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} else if (elseblock) {
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elm.appendChild(elseblock);
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}
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} else {
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if (condition) {
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elm.appendChild(thenblock);
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} else if (elseblock) {
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elm.appendChild(elseblock);
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} else {
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elm.style.display = "none";
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return document.createTextNode("");
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}
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}
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}
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delete props["then"];
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delete props["else"];
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});
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if ("for" in props && "do" in props) {
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const predicate = props["for"];
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const closure = props["do"];
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if (isAJSReferences(predicate)) {
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const __elms = [];
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let lastpredicate = [];
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handle(predicate, val => {
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if (
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Object.keys(val).length &&
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Object.keys(val).length == lastpredicate.length
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) {
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let i = 0;
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for (const index in val) {
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if (
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deepEqual(val[index], lastpredicate[index])
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) {
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continue;
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}
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const part = closure(val[index], index, val);
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elm.replaceChild(part, __elms[i]);
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__elms[i] = part;
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i += 1;
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}
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lastpredicate = Object.keys(
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JSON.parse(JSON.stringify(val)),
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);
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} else {
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for (const part of __elms) {
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part.remove();
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}
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for (const index in val) {
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const value = val[index];
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const part = closure(value, index, val);
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if (part instanceof HTMLElement) {
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__elms.push(part);
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elm.appendChild(part);
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}
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}
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lastpredicate = [];
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}
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});
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} else {
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for (const index in predicate) {
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const value = predicate[index];
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const part = closure(value, index, predicate);
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if (part instanceof Node) elm.appendChild(part);
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}
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}
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delete props["for"];
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delete props["do"];
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}
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// two-way bind an <input>
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useProp("$value", references => {
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if (!isAJSReferences(references)) return;
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if (!(elm instanceof HTMLInputElement)) return;
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handle(references, value => elm.value = value);
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let reference = references[references.length - 1];
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elm.addEventListener("change", () => {
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reference.proxy[reference.property] = elm.value;
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})
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});
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// insert an element at the end
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useProp("after", callback => {
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addChild(callback());
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})
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// apply the non-reactive properties
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for (const name in props) {
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const prop = props[name];
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if (isAJSReferences(prop)) {
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handle(prop, (val) => {
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JSXAddAttributes(elm, name, val);
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});
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} else {
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JSXAddAttributes(elm, name, prop);
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}
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}
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return elm;
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}
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// Where properties are assigned to elements, and where the *non-reactive* syntax sugar goes
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function JSXAddAttributes(elm, name, prop) {
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if (name === "class") {
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elm.className = prop;
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return;
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}
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if (typeof prop === "function" && name === "@mount") {
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prop(elm);
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return;
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}
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if (typeof prop === "function" && name.startsWith("#")) {
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const names = name.substring(1);
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for (const name of names.split("$")) {
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elm.addEventListener(name, (...args) => {
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window.$el = elm;
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prop(...args);
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});
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}
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return;
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}
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if (typeof prop === "function" && name.startsWith("observe")) {
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const observerclass = window[`${name.substring(8)}Observer`];
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if (!observerclass) {
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console.error(`Observer ${name} does not exist`);
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return;
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}
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const observer = new observerclass(entries => {
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for (const entry of entries) {
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window.$el = elm;
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prop(entry);
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}
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});
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observer.observe(elm);
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return;
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}
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if (name.startsWith("bind:")) {
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const propname = name.substring(5);
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prop[propname] = elm;
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return;
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}
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elm.setAttribute(name, prop);
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}
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function parse_css(uid, css) {
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let cssParsed = "";
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const virtualDoc = document.implementation.createHTMLDocument("");
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const virtualStyleElement = document.createElement("style");
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virtualStyleElement.textContent = css;
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virtualDoc.body.appendChild(virtualStyleElement);
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//@ts-ignore
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for (const rule of virtualStyleElement.sheet.cssRules) {
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rule.selectorText = rule.selectorText.includes("self")
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? `.${uid}.self${rule.selectorText.replace("self", "")}`
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: `.${uid} ${rule.selectorText}`;
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cssParsed += `${rule.cssText}\n`;
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}
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return cssParsed;
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}
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export function css(strings, ...values) {
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const uid = `alicecss-${Array(16)
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.fill(0)
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.map(() => {
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return Math.floor(Math.random() * 16).toString(16);
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})
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.join("")}`;
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const styleElement = document.createElement("style");
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document.head.appendChild(styleElement);
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const flattened_template = [];
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for (const i in strings) {
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flattened_template.push(strings[i]);
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if (values[i]) {
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const prop = values[i];
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if (isAJSReferences(prop)) {
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const current_i = flattened_template.length;
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handle(prop, (val) => {
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flattened_template[current_i] = String(val);
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styleElement.textContent = parse_css(
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uid,
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flattened_template.join(""),
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);
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});
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} else {
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flattened_template.push(String(prop));
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}
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}
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}
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styleElement.textContent = parse_css(
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uid,
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flattened_template.join(""),
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);
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return uid;
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}
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function deepEqual(object1, object2) {
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const keys1 = Object.keys(object1);
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const keys2 = Object.keys(object2);
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if (keys1.length !== keys2.length) {
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return false;
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}
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for (const key of keys1) {
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const val1 = object1[key];
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const val2 = object2[key];
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const areObjects = isObject(val1) && isObject(val2);
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if (
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(areObjects && !deepEqual(val1, val2)) ||
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(!areObjects && val1 !== val2)
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) {
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return false;
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}
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}
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return true;
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}
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function isObject(object) {
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return object != null && typeof object === "object";
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}
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