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MIRROR: javascript for 🐜's, a tiny runtime with big ambitions ant.themackabu.dev
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JavaScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133class ReactPromise { constructor(status, value, reason) { this.status = status; this.value = value; this.reason = reason; }}
function createPendingChunk() { return new ReactPromise("pending", null, null);}
function createResolvedIteratorResultChunk(response, value, done) { return new ReactPromise( "resolved_model", (done ? "{\"done\":true,\"value\":" : "{\"done\":false,\"value\":") + value + "}", response );}
function resolveModelChunk(response, chunk, value) { if ("pending" !== chunk.status) { chunk.reason.enqueueModel(value); return; }
chunk.status = "resolved_model"; chunk.value = value; chunk.reason = response;}
function resolveIteratorResultChunk(response, chunk, value, done) { resolveModelChunk( response, chunk, (done ? "{\"done\":true,\"value\":" : "{\"done\":false,\"value\":") + value + "}" );}
function startAsyncIterable(response, id, iterator) { const buffer = []; let closed = false; let nextWriteIndex = 0; const iterable = {};
iterable[Symbol.asyncIterator] = function () { let nextReadIndex = 0; return { next(arg) { if (arg !== undefined) throw new Error("bad arg"); if (nextReadIndex === buffer.length) { if (closed) { return new ReactPromise("fulfilled", { done: true, value: undefined }, null); } buffer[nextReadIndex] = createPendingChunk(response); } return buffer[nextReadIndex++]; } }; };
const controller = { enqueueValue(value) { if (nextWriteIndex === buffer.length) { buffer[nextWriteIndex] = new ReactPromise("fulfilled", { done: false, value }, null); } else { const chunk = buffer[nextWriteIndex]; chunk.status = "fulfilled"; chunk.value = { done: false, value }; chunk.reason = null; } nextWriteIndex++; }, enqueueModel(value) { if (nextWriteIndex === buffer.length) { buffer[nextWriteIndex] = createResolvedIteratorResultChunk(response, value, false); } else { resolveIteratorResultChunk(response, buffer[nextWriteIndex], value, false); } nextWriteIndex++; }, close(value) { if (!closed) { closed = true; if (nextWriteIndex === buffer.length) { buffer[nextWriteIndex] = createResolvedIteratorResultChunk(response, value, true); } else { resolveIteratorResultChunk(response, buffer[nextWriteIndex], value, true); } nextWriteIndex++; } }, error(error) { throw error; } };
response._chunks.set(id, new ReactPromise("fulfilled", iterator ? iterable[Symbol.asyncIterator]() : iterable, controller)); return { buffer, controller };}
function log(label, fn) { try { const out = fn(); console.log(`${label}:${out}`); } catch (error) { console.log(`${label}:ERR:${error && error.message ? error.message : String(error)}`); }}
const response = { _chunks: new Map() };const id = 1;
startAsyncIterable(response, id, true);const chunk = response._chunks.get(id);
log("reasonType", () => typeof chunk.reason);log("enqueueModelType", () => typeof chunk.reason.enqueueModel);
resolveModelChunk(response, chunk, "\"1\"");console.log(`bufferLength:${chunk.reason ? "controller" : "missing"}`);
const response2 = { _chunks: new Map() };const id2 = 2;response2._chunks.set(id2, new ReactPromise("resolved_model", "\"boot\"", response2));const badChunk = response2._chunks.get(id2);log("badReasonType", () => typeof badChunk.reason);log("badEnqueueModelType", () => typeof badChunk.reason.enqueueModel);log("badResolve", () => { resolveModelChunk(response2, badChunk, "\"next\""); return "ok";});