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function delay(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
class LineBreakTransformer {
constructor() {
this.chunks = "";
}
transform(chunk, controller) {
this.chunks += chunk;
const lines = this.chunks.split("\n");
this.chunks = lines.pop();
lines.forEach((line) => controller.enqueue(line));
}
flush(controller) {
controller.enqueue(this.chunks);
}
}
class SerialReadWrite {
constructor(port, baudrate) {
this.port = port;
this.baudRate = baudrate;
this.isPortOpen = false;
this.textDecoder = new TextDecoder();
this.textEncoder = new TextEncoder();
}
async openPort() {
await this.port.open({ baudRate: this.baudRate });
}
async closePort() {
await this.port.close();
}
async readLine(readCallback, timeout = undefined) {
let reader = undefined;
let extraChunk = "";
if (this.isPortOpen === false) {
await this.openPort();
this.isPortOpen = true;
}
while (true) {
try {
if (reader === undefined) {
reader = this.port.readable.getReader();
}
let serialValue;
if (timeout === undefined) {
const { value, done } = await reader.read();
serialValue = value;
} else {
const { value, done } = await Promise.race([
reader.read(),
new Promise((_, reject) => setTimeout(reject, timeout, new Error("timeout")))
]);
serialValue = value;
}
const linesValue = this.textDecoder.decode(serialValue).split('\n');
linesValue[0] = extraChunk + linesValue[0];
extraChunk = linesValue[linesValue.length - 1];
for (const line of linesValue) {
if (readCallback(line) === true) {
return;
}
}
} catch (e) {
if (e instanceof DOMException &&
(e.name === "BreakError" || e.name === "FramingError" || e.name === "ParityError")) {
console.log(e);
} else if (e instanceof Error && e.message === "timeout") {
return;
} else {
throw e;
}
} finally {
if (reader) {
reader.releaseLock();
reader = undefined;
}
}
}
}
async writeString(str) {
let writer = undefined;
if (this.isPortOpen === false) {
await this.openPort();
this.isPortOpen = true;
}
try {
if (writer === undefined) {
writer = this.port.writable.getWriter();
}
writer.write(this.textEncoder.encode(str));
} finally {
if (writer) {
writer.releaseLock();
writer = undefined;
}
}
}
}
async function openPortLineBreak(port, baudRate) {
await port.open({ baudRate: baudRate });
const textDecoder = new TextDecoderStream();
const readableStreamClosed = port.readable.pipeTo(textDecoder.writable);
const reader = await textDecoder.readable.pipeThrough(new TransformStream(new LineBreakTransformer())).getReader();
const textEncoderStream = new TextEncoderStream();
const writerStreamClosed = textEncoderStream.readable.pipeTo(port.writable);
const writer = await textEncoderStream.writable.getWriter();
return { reader, writer, readableStreamClosed, writerStreamClosed };
}
async function closePortLineBreak(port, reader, writer, readableStreamClosed, writerStreamClosed) {
if (reader) {
reader.cancel();
}
if (readableStreamClosed) {
await readableStreamClosed.catch(() => { /* Ignore the error */ });
}
if (writer) {
writer.close();
}
if (writerStreamClosed) {
await writerStreamClosed;
}
if (port) {
await port.close();
}
}
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