Press n or j to go to the next uncovered block, b, p or k for the previous block.
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const {
NumberIsNaN,
} = primordials;
const {
codes: {
ERR_INVALID_ARG_VALUE,
ERR_INVALID_CURSOR_POS,
},
} = require('internal/errors');
const {
validateFunction,
} = require('internal/validators');
const {
CSI,
} = require('internal/readline/utils');
const {
kClearLine,
kClearScreenDown,
kClearToLineBeginning,
kClearToLineEnd,
} = CSI;
/**
* moves the cursor to the x and y coordinate on the given stream
*/
function cursorTo(stream, x, y, callback) {
if (callback !== undefined) {
validateFunction(callback, 'callback');
}
if (typeof y === 'function') {
callback = y;
y = undefined;
}
if (NumberIsNaN(x)) throw new ERR_INVALID_ARG_VALUE('x', x);
if (NumberIsNaN(y)) throw new ERR_INVALID_ARG_VALUE('y', y);
if (stream == null || (typeof x !== 'number' && typeof y !== 'number')) {
if (typeof callback === 'function') process.nextTick(callback, null);
return true;
}
if (typeof x !== 'number') throw new ERR_INVALID_CURSOR_POS();
const data = typeof y !== 'number' ? CSI`${x + 1}G` : CSI`${y + 1};${x + 1}H`;
return stream.write(data, callback);
}
/**
* moves the cursor relative to its current location
*/
function moveCursor(stream, dx, dy, callback) {
if (callback !== undefined) {
validateFunction(callback, 'callback');
}
if (stream == null || !(dx || dy)) {
if (typeof callback === 'function') process.nextTick(callback, null);
return true;
}
let data = '';
if (dx < 0) {
data += CSI`${-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`;
}
return stream.write(data, callback);
}
/**
* clears the current line the cursor is on:
* -1 for left of the cursor
* +1 for right of the cursor
* 0 for the entire line
*/
function clearLine(stream, dir, callback) {
if (callback !== undefined) {
validateFunction(callback, 'callback');
}
if (stream === null || stream === undefined) {
if (typeof callback === 'function') process.nextTick(callback, null);
return true;
}
const type =
dir < 0 ? kClearToLineBeginning : dir > 0 ? kClearToLineEnd : kClearLine;
return stream.write(type, callback);
}
/**
* clears the screen from the current position of the cursor down
*/
function clearScreenDown(stream, callback) {
if (callback !== undefined) {
validateFunction(callback, 'callback');
}
if (stream === null || stream === undefined) {
if (typeof callback === 'function') process.nextTick(callback, null);
return true;
}
return stream.write(kClearScreenDown, callback);
}
module.exports = {
clearLine,
clearScreenDown,
cursorTo,
moveCursor,
};
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