Press n or j to go to the next uncovered block, b, p or k for the previous block.
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const {
SafeStringIterator,
Symbol,
} = primordials;
const {
charLengthAt,
CSI,
emitKeys,
} = require('internal/readline/utils');
const {
kSawKeyPress,
} = require('internal/readline/interface');
const { clearTimeout, setTimeout } = require('timers');
const {
kEscape,
} = CSI;
const { StringDecoder } = require('string_decoder');
const KEYPRESS_DECODER = Symbol('keypress-decoder');
const ESCAPE_DECODER = Symbol('escape-decoder');
// GNU readline library - keyseq-timeout is 500ms (default)
const ESCAPE_CODE_TIMEOUT = 500;
/**
* accepts a readable Stream instance and makes it emit "keypress" events
*/
function emitKeypressEvents(stream, iface = {}) {
if (stream[KEYPRESS_DECODER]) return;
stream[KEYPRESS_DECODER] = new StringDecoder('utf8');
stream[ESCAPE_DECODER] = emitKeys(stream);
stream[ESCAPE_DECODER].next();
const triggerEscape = () => stream[ESCAPE_DECODER].next('');
const { escapeCodeTimeout = ESCAPE_CODE_TIMEOUT } = iface;
let timeoutId;
function onData(input) {
if (stream.listenerCount('keypress') > 0) {
const string = stream[KEYPRESS_DECODER].write(input);
if (string) {
clearTimeout(timeoutId);
// This supports characters of length 2.
iface[kSawKeyPress] = charLengthAt(string, 0) === string.length;
iface.isCompletionEnabled = false;
let length = 0;
for (const character of new SafeStringIterator(string)) {
length += character.length;
if (length === string.length) {
iface.isCompletionEnabled = true;
}
try {
stream[ESCAPE_DECODER].next(character);
// Escape letter at the tail position
if (length === string.length && character === kEscape) {
timeoutId = setTimeout(triggerEscape, escapeCodeTimeout);
}
} catch (err) {
// If the generator throws (it could happen in the `keypress`
// event), we need to restart it.
stream[ESCAPE_DECODER] = emitKeys(stream);
stream[ESCAPE_DECODER].next();
throw err;
}
}
}
} else {
// Nobody's watching anyway
stream.removeListener('data', onData);
stream.on('newListener', onNewListener);
}
}
function onNewListener(event) {
if (event === 'keypress') {
stream.on('data', onData);
stream.removeListener('newListener', onNewListener);
}
}
if (stream.listenerCount('keypress') > 0) {
stream.on('data', onData);
} else {
stream.on('newListener', onNewListener);
}
}
module.exports = emitKeypressEvents;
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