mirror of
https://github.com/denoland/deno.git
synced 2024-12-20 22:34:46 -05:00
583 lines
14 KiB
JavaScript
583 lines
14 KiB
JavaScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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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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"use strict";
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const kUTF16SurrogateThreshold = 0x10000; // 2 ** 16
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const kEscape = "\x1b";
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export const kSubstringSearch = Symbol("kSubstringSearch");
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export function CSI(strings, ...args) {
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let ret = `${kEscape}[`;
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for (let n = 0; n < strings.length; n++) {
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ret += strings[n];
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if (n < args.length) {
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ret += args[n];
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}
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}
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return ret;
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}
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CSI.kEscape = kEscape;
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CSI.kClearToLineBeginning = `${kEscape}[1K`;
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CSI.kClearToLineEnd = `${kEscape}[0K`;
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CSI.kClearLine = `${kEscape}[2K`;
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CSI.kClearScreenDown = `${kEscape}[0J`;
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// TODO(BridgeAR): Treat combined characters as single character, i.e,
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// 'a\u0301' and '\u0301a' (both have the same visual output).
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// Check Canonical_Combining_Class in
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// http://userguide.icu-project.org/strings/properties
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export function charLengthLeft(str, i) {
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if (i <= 0) {
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return 0;
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}
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if (
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(i > 1 &&
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str.codePointAt(i - 2) >= kUTF16SurrogateThreshold) ||
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str.codePointAt(i - 1) >= kUTF16SurrogateThreshold
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) {
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return 2;
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}
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return 1;
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}
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export function charLengthAt(str, i) {
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if (str.length <= i) {
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// Pretend to move to the right. This is necessary to autocomplete while
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// moving to the right.
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return 1;
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}
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return str.codePointAt(i) >= kUTF16SurrogateThreshold ? 2 : 1;
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}
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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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export function* emitKeys(stream) {
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while (true) {
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let ch = yield;
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let s = ch;
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let escaped = false;
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const key = {
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sequence: null,
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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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if (ch === kEscape) {
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escaped = true;
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s += ch = yield;
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if (ch === kEscape) {
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s += ch = yield;
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}
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}
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if (escaped && (ch === "O" || ch === "[")) {
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// ANSI escape sequence
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let code = ch;
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let modifier = 0;
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if (ch === "O") {
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// ESC O letter
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// ESC O modifier letter
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s += ch = yield;
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if (ch >= "0" && ch <= "9") {
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modifier = (ch >> 0) - 1;
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s += ch = yield;
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}
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code += ch;
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} else if (ch === "[") {
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// ESC [ letter
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// ESC [ modifier letter
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// ESC [ [ modifier letter
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// ESC [ [ num char
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s += ch = yield;
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if (ch === "[") {
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// \x1b[[A
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// ^--- escape codes might have a second bracket
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code += ch;
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s += ch = yield;
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}
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/*
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* Here and later we try to buffer just enough data to get
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* a complete ascii sequence.
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*
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* We have basically two classes of ascii characters to process:
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*
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* 1. `\x1b[24;5~` should be parsed as { code: '[24~', modifier: 5 }
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*
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* This particular example is featuring Ctrl+F12 in xterm.
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*
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* - `;5` part is optional, e.g. it could be `\x1b[24~`
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* - first part can contain one or two digits
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*
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* So the generic regexp is like /^\d\d?(;\d)?[~^$]$/
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*
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* 2. `\x1b[1;5H` should be parsed as { code: '[H', modifier: 5 }
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*
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* This particular example is featuring Ctrl+Home in xterm.
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*
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* - `1;5` part is optional, e.g. it could be `\x1b[H`
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* - `1;` part is optional, e.g. it could be `\x1b[5H`
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*
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* So the generic regexp is like /^((\d;)?\d)?[A-Za-z]$/
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*/
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const cmdStart = s.length - 1;
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// Skip one or two leading digits
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if (ch >= "0" && ch <= "9") {
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s += ch = yield;
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if (ch >= "0" && ch <= "9") {
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s += ch = yield;
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}
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}
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// skip modifier
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if (ch === ";") {
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s += ch = yield;
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if (ch >= "0" && ch <= "9") {
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s += yield;
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}
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}
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/*
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* We buffered enough data, now trying to extract code
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* and modifier from it
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*/
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const cmd = s.slice(cmdStart);
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let match;
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if ((match = cmd.match(/^(\d\d?)(;(\d))?([~^$])$/))) {
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code += match[1] + match[4];
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modifier = (match[3] || 1) - 1;
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} else if (
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(match = cmd.match(/^((\d;)?(\d))?([A-Za-z])$/))
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) {
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code += match[4];
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modifier = (match[3] || 1) - 1;
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} else {
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code += cmd;
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}
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}
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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 [ letter (with modifier) */
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case "[P":
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key.name = "f1";
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break;
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case "[Q":
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key.name = "f2";
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break;
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case "[R":
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key.name = "f3";
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break;
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case "[S":
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key.name = "f4";
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break;
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/* xterm/gnome ESC O letter (without modifier) */
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case "OP":
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key.name = "f1";
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break;
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case "OQ":
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key.name = "f2";
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break;
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case "OR":
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key.name = "f3";
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break;
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case "OS":
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key.name = "f4";
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break;
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/* xterm/rxvt ESC [ number ~ */
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case "[11~":
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key.name = "f1";
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break;
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case "[12~":
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key.name = "f2";
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break;
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case "[13~":
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key.name = "f3";
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break;
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case "[14~":
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key.name = "f4";
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break;
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/* from Cygwin and used in libuv */
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case "[[A":
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key.name = "f1";
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break;
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case "[[B":
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key.name = "f2";
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break;
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case "[[C":
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key.name = "f3";
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break;
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case "[[D":
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key.name = "f4";
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break;
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case "[[E":
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key.name = "f5";
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break;
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/* common */
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case "[15~":
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key.name = "f5";
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break;
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case "[17~":
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key.name = "f6";
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break;
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case "[18~":
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key.name = "f7";
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break;
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case "[19~":
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key.name = "f8";
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break;
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case "[20~":
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key.name = "f9";
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break;
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case "[21~":
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key.name = "f10";
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break;
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case "[23~":
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key.name = "f11";
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break;
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case "[24~":
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key.name = "f12";
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break;
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/* xterm ESC [ letter */
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case "[A":
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key.name = "up";
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break;
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case "[B":
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key.name = "down";
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break;
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case "[C":
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key.name = "right";
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break;
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case "[D":
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key.name = "left";
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break;
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case "[E":
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key.name = "clear";
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break;
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case "[F":
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key.name = "end";
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break;
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case "[H":
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key.name = "home";
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break;
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/* xterm/gnome ESC O letter */
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case "OA":
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key.name = "up";
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break;
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case "OB":
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key.name = "down";
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break;
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case "OC":
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key.name = "right";
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break;
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case "OD":
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key.name = "left";
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break;
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case "OE":
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key.name = "clear";
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break;
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case "OF":
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key.name = "end";
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break;
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case "OH":
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key.name = "home";
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break;
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/* xterm/rxvt ESC [ number ~ */
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case "[1~":
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key.name = "home";
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break;
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case "[2~":
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key.name = "insert";
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break;
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case "[3~":
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key.name = "delete";
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break;
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case "[4~":
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key.name = "end";
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break;
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case "[5~":
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key.name = "pageup";
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break;
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case "[6~":
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key.name = "pagedown";
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break;
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/* putty */
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case "[[5~":
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key.name = "pageup";
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break;
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case "[[6~":
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key.name = "pagedown";
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break;
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/* rxvt */
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case "[7~":
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key.name = "home";
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break;
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case "[8~":
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key.name = "end";
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break;
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/* rxvt keys with modifiers */
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case "[a":
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key.name = "up";
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key.shift = true;
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break;
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case "[b":
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key.name = "down";
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key.shift = true;
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break;
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case "[c":
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key.name = "right";
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key.shift = true;
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break;
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case "[d":
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key.name = "left";
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key.shift = true;
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break;
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case "[e":
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key.name = "clear";
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key.shift = true;
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break;
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case "[2$":
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key.name = "insert";
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key.shift = true;
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break;
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case "[3$":
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key.name = "delete";
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key.shift = true;
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break;
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case "[5$":
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key.name = "pageup";
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key.shift = true;
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break;
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case "[6$":
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key.name = "pagedown";
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key.shift = true;
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break;
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case "[7$":
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key.name = "home";
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key.shift = true;
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break;
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case "[8$":
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key.name = "end";
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key.shift = true;
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break;
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case "Oa":
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key.name = "up";
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key.ctrl = true;
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break;
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case "Ob":
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key.name = "down";
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key.ctrl = true;
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break;
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case "Oc":
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key.name = "right";
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key.ctrl = true;
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break;
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case "Od":
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key.name = "left";
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key.ctrl = true;
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break;
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case "Oe":
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key.name = "clear";
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key.ctrl = true;
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break;
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case "[2^":
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key.name = "insert";
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key.ctrl = true;
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break;
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case "[3^":
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key.name = "delete";
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key.ctrl = true;
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break;
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case "[5^":
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key.name = "pageup";
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key.ctrl = true;
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break;
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case "[6^":
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key.name = "pagedown";
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key.ctrl = true;
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break;
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case "[7^":
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key.name = "home";
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key.ctrl = true;
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break;
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case "[8^":
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key.name = "end";
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key.ctrl = true;
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break;
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/* misc. */
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case "[Z":
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key.name = "tab";
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key.shift = true;
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break;
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default:
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key.name = "undefined";
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break;
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}
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} else if (ch === "\r") {
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// carriage return
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key.name = "return";
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key.meta = escaped;
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} else if (ch === "\n") {
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// Enter, should have been called linefeed
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key.name = "enter";
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key.meta = escaped;
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} else if (ch === "\t") {
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// tab
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key.name = "tab";
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key.meta = escaped;
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} else if (ch === "\b" || ch === "\x7f") {
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// backspace or ctrl+h
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key.name = "backspace";
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key.meta = escaped;
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} else if (ch === kEscape) {
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// escape key
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key.name = "escape";
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key.meta = escaped;
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} else if (ch === " ") {
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key.name = "space";
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key.meta = escaped;
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} else if (!escaped && ch <= "\x1a") {
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// ctrl+letter
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key.name = String.fromCharCode(
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ch.charCodeAt() + "a".charCodeAt() - 1,
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);
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key.ctrl = true;
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} else if (/^[0-9A-Za-z]$/.test(ch)) {
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// Letter, number, shift+letter
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key.name = ch.toLowerCase();
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key.shift = /^[A-Z]$/.test(ch);
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key.meta = escaped;
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} else if (escaped) {
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// Escape sequence timeout
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key.name = ch.length ? undefined : "escape";
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key.meta = true;
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}
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key.sequence = s;
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if (s.length !== 0 && (key.name !== undefined || escaped)) {
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/* Named character or sequence */
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stream.emit("keypress", escaped ? undefined : s, key);
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} else if (charLengthAt(s, 0) === s.length) {
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/* Single unnamed character, e.g. "." */
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stream.emit("keypress", s, key);
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}
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/* Unrecognized or broken escape sequence, don't emit anything */
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}
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}
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|
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// This runs in O(n log n).
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export function commonPrefix(strings) {
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if (strings.length === 1) {
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return strings[0];
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}
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const sorted = strings.slice().sort();
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const min = sorted[0];
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const max = sorted[sorted.length - 1];
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for (let i = 0; i < min.length; i++) {
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if (min[i] !== max[i]) {
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return min.slice(0, i);
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}
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}
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return min;
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}
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|
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export default {
|
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CSI,
|
|
charLengthAt,
|
|
charLengthLeft,
|
|
emitKeys,
|
|
commonPrefix,
|
|
kSubstringSearch,
|
|
};
|