Press n or j to go to the next uncovered block, b, p or k for the previous block.
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const {
ArrayPrototypeJoin,
ArrayPrototypePush,
Promise,
} = primordials;
const { CSI } = require('internal/readline/utils');
const { validateBoolean, validateInteger } = require('internal/validators');
const { isWritable } = require('internal/streams/utils');
const { codes: { ERR_INVALID_ARG_TYPE } } = require('internal/errors');
const {
kClearToLineBeginning,
kClearToLineEnd,
kClearLine,
kClearScreenDown,
} = CSI;
class Readline {
#autoCommit = false;
#stream;
#todo = [];
constructor(stream, options = undefined) {
if (!isWritable(stream))
throw new ERR_INVALID_ARG_TYPE('stream', 'Writable', stream);
this.#stream = stream;
if (options?.autoCommit != null) {
validateBoolean(options.autoCommit, 'options.autoCommit');
this.#autoCommit = options.autoCommit;
}
}
/**
* Moves the cursor to the x and y coordinate on the given stream.
* @param {integer} x
* @param {integer} [y]
* @returns {Readline} this
*/
cursorTo(x, y = undefined) {
validateInteger(x, 'x');
if (y != null) validateInteger(y, 'y');
const data = y == null ? CSI`${x + 1}G` : CSI`${y + 1};${x + 1}H`;
if (this.#autoCommit) process.nextTick(() => this.#stream.write(data));
else ArrayPrototypePush(this.#todo, data);
return this;
}
/**
* Moves the cursor relative to its current location.
* @param {integer} dx
* @param {integer} dy
* @returns {Readline} this
*/
moveCursor(dx, dy) {
if (dx || dy) {
validateInteger(dx, 'dx');
validateInteger(dy, 'dy');
let data = '';
if (dx < 0) {
data += CSI`${-dx}D`;
} else if (dx > 0) {
data += CSI`${dx}C`;
}
if (dy < 0) {
data += CSI`${-dy}A`;
} else if (dy > 0) {
data += CSI`${dy}B`;
}
if (this.#autoCommit) process.nextTick(() => this.#stream.write(data));
else ArrayPrototypePush(this.#todo, data);
}
return this;
}
/**
* Clears the current line the cursor is on.
* @param {-1|0|1} dir Direction to clear:
* -1 for left of the cursor
* +1 for right of the cursor
* 0 for the entire line
* @returns {Readline} this
*/
clearLine(dir) {
validateInteger(dir, 'dir', -1, 1);
const data =
dir < 0 ? kClearToLineBeginning :
dir > 0 ? kClearToLineEnd :
kClearLine;
if (this.#autoCommit) process.nextTick(() => this.#stream.write(data));
else ArrayPrototypePush(this.#todo, data);
return this;
}
/**
* Clears the screen from the current position of the cursor down.
* @returns {Readline} this
*/
clearScreenDown() {
if (this.#autoCommit) {
process.nextTick(() => this.#stream.write(kClearScreenDown));
} else {
ArrayPrototypePush(this.#todo, kClearScreenDown);
}
return this;
}
/**
* Sends all the pending actions to the associated `stream` and clears the
* internal list of pending actions.
* @returns {Promise<void>} Resolves when all pending actions have been
* flushed to the associated `stream`.
*/
commit() {
return new Promise((resolve) => {
this.#stream.write(ArrayPrototypeJoin(this.#todo, ''), resolve);
this.#todo = [];
});
}
/**
* Clears the internal list of pending actions without sending it to the
* associated `stream`.
* @returns {Readline} this
*/
rollback() {
this.#todo = [];
return this;
}
}
module.exports = {
Readline,
};
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