d8's readline() is useless for reading STDIN where standard input is not
UTF-8, e.g., readline() will stop reading when the initial input is a
Uint32Array denoting the size of the following message.
While ECMA-262 does not specify reading stadard input or writing to
standard output there is precedent in d8 for writing to
STDOUT: writeFile("/proc/self/fd/1")*. *SpiderMonkey's js does read past
the initial Uint32Array with readline(), though like d8, expects a newline
character.
Circa 2024 JavaScript is a general programming language - that lacks the
basic capability to read STDIN and write to STDOUT in an engine and runtime
agnostic way, using an (resizable) ArrayBuffer to store variable standard
input. For the non-browser environments we can use Web IDL to indicate when
tyo expose or not expose the capability, just like certain interfaces are
only available or not available in certain contexts; whether that be no
fetch() in an AudioWorklet, or TCPSocketServer only in Isolated Web Apps.
Something like
this
https://github.com/guest271314/NativeMessagingHosts/blob/main/nm_host.js#L45-L69
should be standardized for JavaScript as a whole so we can use the same
code in different engines and runtimes, instead of having to use different
standard input and standard output code for each engine and runtime.
Thanks for your consideration.
async function* getMessage() {
let messageLength = 0;
let readOffset = 0;
for await (let message of readable) {
if (buffer.byteLength === 0) {
buffer.resize(4);
for (let i = 0; i < 4; i++) {
view.setUint8(i, message[i]);
}
messageLength = view.getUint32(0, true);
message = message.subarray(4);
buffer.resize(0);
}
buffer.resize(buffer.byteLength + message.length);
for (let i = 0; i < message.length; i++, readOffset++) {
view.setUint8(readOffset, message[i]);
}
if (buffer.byteLength === messageLength) {
yield new Uint8Array(buffer);
messageLength = 0;
readOffset = 0;
buffer.resize(0);
}
}
}
try {
await sendMessage(encodeMessage([{ dirname, filename, url }, ...args]));
for await (const message of getMessage()) {
await sendMessage(message);
}
} catch (e) {
exit();
}
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