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142 lines
3.7 KiB
JavaScript
142 lines
3.7 KiB
JavaScript
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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// Copyright Joyent, Inc. and other Node contributors.
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// TODO(petamoriken): enable prefer-primordials for node polyfills
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// deno-lint-ignore-file prefer-primordials
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import { ArrayPrototypeJoin, ArrayPrototypePush } from "ext:deno_node/internal/primordials.mjs";
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import { CSI } from "ext:deno_node/internal/readline/utils.mjs";
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import { validateBoolean, validateInteger } from "ext:deno_node/internal/validators.mjs";
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import { isWritable } from "ext:deno_node/internal/streams/utils.mjs";
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import { ERR_INVALID_ARG_TYPE } from "ext:deno_node/internal/errors.ts";
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const {
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kClearToLineBeginning,
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kClearToLineEnd,
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kClearLine,
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kClearScreenDown,
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} = CSI;
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export class Readline {
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#autoCommit = false;
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#stream;
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#todo = [];
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constructor(stream, options = undefined) {
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if (!isWritable(stream)) {
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throw new ERR_INVALID_ARG_TYPE("stream", "Writable", stream);
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}
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this.#stream = stream;
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if (options?.autoCommit != null) {
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validateBoolean(options.autoCommit, "options.autoCommit");
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this.#autoCommit = options.autoCommit;
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}
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}
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/**
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* Moves the cursor to the x and y coordinate on the given stream.
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* @param {integer} x
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* @param {integer} [y]
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* @returns {Readline} this
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*/
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cursorTo(x, y = undefined) {
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validateInteger(x, "x");
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if (y != null) validateInteger(y, "y");
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const data = y == null ? CSI`${x + 1}G` : CSI`${y + 1};${x + 1}H`;
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if (this.#autoCommit) process.nextTick(() => this.#stream.write(data));
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else ArrayPrototypePush(this.#todo, data);
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return this;
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}
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/**
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* Moves the cursor relative to its current location.
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* @param {integer} dx
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* @param {integer} dy
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* @returns {Readline} this
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*/
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moveCursor(dx, dy) {
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if (dx || dy) {
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validateInteger(dx, "dx");
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validateInteger(dy, "dy");
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let data = "";
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if (dx < 0) {
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data += CSI`${-dx}D`;
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} else if (dx > 0) {
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data += CSI`${dx}C`;
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}
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if (dy < 0) {
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data += CSI`${-dy}A`;
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} else if (dy > 0) {
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data += CSI`${dy}B`;
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}
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if (this.#autoCommit) process.nextTick(() => this.#stream.write(data));
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else ArrayPrototypePush(this.#todo, data);
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}
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return this;
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}
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/**
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* Clears the current line the cursor is on.
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* @param {-1|0|1} dir Direction to clear:
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* -1 for left of the cursor
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* +1 for right of the cursor
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* 0 for the entire line
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* @returns {Readline} this
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*/
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clearLine(dir) {
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validateInteger(dir, "dir", -1, 1);
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const data = dir < 0
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? kClearToLineBeginning
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: dir > 0
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? kClearToLineEnd
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: kClearLine;
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if (this.#autoCommit) process.nextTick(() => this.#stream.write(data));
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else ArrayPrototypePush(this.#todo, data);
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return this;
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}
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/**
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* Clears the screen from the current position of the cursor down.
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* @returns {Readline} this
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*/
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clearScreenDown() {
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if (this.#autoCommit) {
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process.nextTick(() => this.#stream.write(kClearScreenDown));
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} else {
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ArrayPrototypePush(this.#todo, kClearScreenDown);
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}
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return this;
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}
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/**
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* Sends all the pending actions to the associated `stream` and clears the
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* internal list of pending actions.
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* @returns {Promise<void>} Resolves when all pending actions have been
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* flushed to the associated `stream`.
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*/
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commit() {
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return new Promise((resolve) => {
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this.#stream.write(ArrayPrototypeJoin(this.#todo, ""), resolve);
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this.#todo = [];
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});
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}
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/**
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* Clears the internal list of pending actions without sending it to the
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* associated `stream`.
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* @returns {Readline} this
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*/
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rollback() {
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this.#todo = [];
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return this;
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}
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}
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export default Readline;
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