Mon 21 Jul 22:43:21 CEST 2025
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js/term/keys.js
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339
js/term/keys.js
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/**
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* keys.js - emit key presses
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* Copyright (c) 2010-2015, Joyent, Inc. and other contributors (MIT License)
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* https://github.com/chjj/blessed
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*/
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// Originally taken from the node.js tree:
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//
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// Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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var EventEmitter = Require('events').EventEmitter;
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// NOTE: node <=v0.8.x has no EventEmitter.listenerCount
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function listenerCount(stream, event) {
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return EventEmitter.listenerCount
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? EventEmitter.listenerCount(stream, event)
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: stream.listeners(event).length;
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}
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/**
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* accepts a readable Stream instance and makes it emit "keypress" events
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*/
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function emitKeypressEvents(stream) {
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if (stream._keypressDecoder) return;
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var StringDecoder = Require('string_decoder').StringDecoder; // lazy load
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stream._keypressDecoder = new StringDecoder('utf8');
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function onData(b) {
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if (listenerCount(stream, 'keypress') > 0) {
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var r = stream._keypressDecoder.write(b);
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if (r) emitKeys(stream, r);
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} else {
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// Nobody's watching anyway
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stream.removeListener('data', onData);
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stream.on('newListener', onNewListener);
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}
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}
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function onNewListener(event) {
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if (event === 'keypress') {
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stream.on('data', onData);
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stream.removeListener('newListener', onNewListener);
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}
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}
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if (listenerCount(stream, 'keypress') > 0) {
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stream.on('data', onData);
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} else {
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stream.on('newListener', onNewListener);
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}
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}
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exports.emitKeypressEvents = emitKeypressEvents;
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/*
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Some patterns seen in terminal key escape codes, derived from combos seen
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at http://www.midnight-commander.org/browser/lib/tty/key.c
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ESC letter
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ESC [ letter
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ESC [ modifier letter
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ESC [ 1 ; modifier letter
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ESC [ num char
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ESC [ num ; modifier char
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ESC O letter
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ESC O modifier letter
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ESC O 1 ; modifier letter
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ESC N letter
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ESC [ [ num ; modifier char
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ESC [ [ 1 ; modifier letter
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ESC ESC [ num char
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ESC ESC O letter
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- char is usually ~ but $ and ^ also happen with rxvt
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- modifier is 1 +
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(shift * 1) +
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(left_alt * 2) +
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(ctrl * 4) +
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(right_alt * 8)
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- two leading ESCs apparently mean the same as one leading ESC
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*/
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// Regexes used for ansi escape code splitting
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var metaKeyCodeReAnywhere = /(?:\x1b)([a-zA-Z0-9])/;
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var metaKeyCodeRe = new RegExp('^' + metaKeyCodeReAnywhere.source + '$');
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var functionKeyCodeReAnywhere = new RegExp('(?:\x1b+)(O|N|\\[|\\[\\[)(?:' + [
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'(\\d+)(?:;(\\d+))?([~^$])',
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'(?:M([@ #!a`])(.)(.))', // mouse
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'(?:1;)?(\\d+)?([a-zA-Z])'
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].join('|') + ')');
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var functionKeyCodeRe = new RegExp('^' + functionKeyCodeReAnywhere.source);
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var escapeCodeReAnywhere = new RegExp([
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functionKeyCodeReAnywhere.source, metaKeyCodeReAnywhere.source, /\x1b./.source
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].join('|'));
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function emitKeys(stream, s) {
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if (Buffer.isBuffer(s)) {
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if (s[0] > 127 && s[1] === undefined) {
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s[0] -= 128;
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s = '\x1b' + s.toString(stream.encoding || 'utf-8');
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} else {
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s = s.toString(stream.encoding || 'utf-8');
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}
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}
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if (isMouse(s)) return;
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var buffer = [];
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var match;
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while (match = escapeCodeReAnywhere.exec(s)) {
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buffer = buffer.concat(s.slice(0, match.index).split(''));
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buffer.push(match[0]);
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s = s.slice(match.index + match[0].length);
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}
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buffer = buffer.concat(s.split(''));
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buffer.forEach(function(s) {
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var ch,
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key = {
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sequence: s,
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name: undefined,
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ctrl: false,
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meta: false,
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shift: false
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},
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parts;
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if (s === '\r') {
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// carriage return
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key.name = 'return';
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} else if (s === '\n') {
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// enter, should have been called linefeed
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key.name = 'enter';
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// linefeed
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// key.name = 'linefeed';
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} else if (s === '\t') {
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// tab
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key.name = 'tab';
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} else if (s === '\b' || s === '\x7f' ||
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s === '\x1b\x7f' || s === '\x1b\b') {
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// backspace or ctrl+h
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key.name = 'backspace';
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key.meta = (s.charAt(0) === '\x1b');
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} else if (s === '\x1b' || s === '\x1b\x1b') {
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// escape key
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key.name = 'escape';
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key.meta = (s.length === 2);
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} else if (s === ' ' || s === '\x1b ') {
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key.name = 'space';
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key.meta = (s.length === 2);
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} else if (s.length === 1 && s <= '\x1a') {
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// ctrl+letter
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key.name = String.fromCharCode(s.charCodeAt(0) + 'a'.charCodeAt(0) - 1);
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key.ctrl = true;
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} else if (s.length === 1 && s >= 'a' && s <= 'z') {
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// lowercase letter
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key.name = s;
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} else if (s.length === 1 && s >= 'A' && s <= 'Z') {
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// shift+letter
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key.name = s.toLowerCase();
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key.shift = true;
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} else if (parts = metaKeyCodeRe.exec(s)) {
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// meta+character key
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key.name = parts[1].toLowerCase();
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key.meta = true;
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key.shift = /^[A-Z]$/.test(parts[1]);
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} else if (parts = functionKeyCodeRe.exec(s)) {
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// ansi escape sequence
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// reassemble the key code leaving out leading \x1b's,
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// the modifier key bitflag and any meaningless "1;" sequence
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var code = (parts[1] || '') + (parts[2] || '') +
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(parts[4] || '') + (parts[9] || ''),
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modifier = (parts[3] || parts[8] || 1) - 1;
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// Parse the key modifier
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key.ctrl = !!(modifier & 4);
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key.meta = !!(modifier & 10);
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key.shift = !!(modifier & 1);
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key.code = code;
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// Parse the key itself
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switch (code) {
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/* xterm/gnome ESC O letter */
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case 'OP': key.name = 'f1'; break;
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case 'OQ': key.name = 'f2'; break;
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case 'OR': key.name = 'f3'; break;
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case 'OS': key.name = 'f4'; break;
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/* xterm/rxvt ESC [ number ~ */
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case '[11~': key.name = 'f1'; break;
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case '[12~': key.name = 'f2'; break;
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case '[13~': key.name = 'f3'; break;
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case '[14~': key.name = 'f4'; break;
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/* from Cygwin and used in libuv */
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case '[[A': key.name = 'f1'; break;
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case '[[B': key.name = 'f2'; break;
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case '[[C': key.name = 'f3'; break;
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case '[[D': key.name = 'f4'; break;
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case '[[E': key.name = 'f5'; break;
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/* common */
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case '[15~': key.name = 'f5'; break;
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case '[17~': key.name = 'f6'; break;
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case '[18~': key.name = 'f7'; break;
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case '[19~': key.name = 'f8'; break;
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case '[20~': key.name = 'f9'; break;
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case '[21~': key.name = 'f10'; break;
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case '[23~': key.name = 'f11'; break;
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case '[24~': key.name = 'f12'; break;
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/* xterm ESC [ letter */
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case '[A': key.name = 'up'; break;
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case '[B': key.name = 'down'; break;
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case '[C': key.name = 'right'; break;
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case '[D': key.name = 'left'; break;
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case '[E': key.name = 'clear'; break;
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case '[F': key.name = 'end'; break;
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case '[H': key.name = 'home'; break;
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/* xterm/gnome ESC O letter */
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case 'OA': key.name = 'up'; break;
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case 'OB': key.name = 'down'; break;
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case 'OC': key.name = 'right'; break;
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case 'OD': key.name = 'left'; break;
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case 'OE': key.name = 'clear'; break;
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case 'OF': key.name = 'end'; break;
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case 'OH': key.name = 'home'; break;
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/* xterm/rxvt ESC [ number ~ */
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case '[1~': key.name = 'home'; break;
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case '[2~': key.name = 'insert'; break;
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case '[3~': key.name = 'delete'; break;
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case '[4~': key.name = 'end'; break;
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case '[5~': key.name = 'pageup'; break;
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case '[6~': key.name = 'pagedown'; break;
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/* putty */
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case '[[5~': key.name = 'pageup'; break;
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case '[[6~': key.name = 'pagedown'; break;
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/* rxvt */
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case '[7~': key.name = 'home'; break;
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case '[8~': key.name = 'end'; break;
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/* rxvt keys with modifiers */
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case '[a': key.name = 'up'; key.shift = true; break;
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case '[b': key.name = 'down'; key.shift = true; break;
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case '[c': key.name = 'right'; key.shift = true; break;
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case '[d': key.name = 'left'; key.shift = true; break;
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case '[e': key.name = 'clear'; key.shift = true; break;
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case '[2$': key.name = 'insert'; key.shift = true; break;
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case '[3$': key.name = 'delete'; key.shift = true; break;
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case '[5$': key.name = 'pageup'; key.shift = true; break;
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case '[6$': key.name = 'pagedown'; key.shift = true; break;
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case '[7$': key.name = 'home'; key.shift = true; break;
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case '[8$': key.name = 'end'; key.shift = true; break;
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case 'Oa': key.name = 'up'; key.ctrl = true; break;
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case 'Ob': key.name = 'down'; key.ctrl = true; break;
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case 'Oc': key.name = 'right'; key.ctrl = true; break;
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case 'Od': key.name = 'left'; key.ctrl = true; break;
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case 'Oe': key.name = 'clear'; key.ctrl = true; break;
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case '[2^': key.name = 'insert'; key.ctrl = true; break;
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case '[3^': key.name = 'delete'; key.ctrl = true; break;
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case '[5^': key.name = 'pageup'; key.ctrl = true; break;
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case '[6^': key.name = 'pagedown'; key.ctrl = true; break;
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case '[7^': key.name = 'home'; key.ctrl = true; break;
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case '[8^': key.name = 'end'; key.ctrl = true; break;
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/* misc. */
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case '[Z': key.name = 'tab'; key.shift = true; break;
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default: key.name = 'undefined'; break;
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}
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}
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// Don't emit a key if no name was found
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if (key.name === undefined) {
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key = undefined;
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}
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if (s.length === 1) {
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ch = s;
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}
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if (key || ch) {
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stream.emit('keypress', ch, key);
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// if (key && key.name === 'return') {
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// var nkey = {};
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// Object.keys(key).forEach(function(k) {
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// nkey[k] = key[k];
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// });
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// nkey.name = 'enter';
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// stream.emit('keypress', ch, nkey);
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// }
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}
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});
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}
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function isMouse(s) {
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return /\x1b\[M/.test(s)
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|| /\x1b\[M([\x00\u0020-\ufffe]{3})/.test(s)
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|| /\x1b\[(\d+;\d+;\d+)M/.test(s)
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|| /\x1b\[<(\d+;\d+;\d+)([mM])/.test(s)
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|| /\x1b\[<(\d+;\d+;\d+;\d+)&w/.test(s)
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|| /\x1b\[24([0135])~\[(\d+),(\d+)\]\r/.test(s)
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|| /\x1b\[(O|I)/.test(s);
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}
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