"use strict";
const kUTF16SurrogateThreshold = 0x10000; const kEscape = "\x1b";export const kSubstringSearch = Symbol("kSubstringSearch");
export function CSI(strings, ...args) { let ret = `${kEscape}[`; for (let n = 0; n < strings.length; n++) { ret += strings[n]; if (n < args.length) { ret += args[n]; } } return ret;}
CSI.kEscape = kEscape;CSI.kClearToLineBeginning = CSI`1K`;CSI.kClearToLineEnd = CSI`0K`;CSI.kClearLine = CSI`2K`;CSI.kClearScreenDown = CSI`0J`;
export function charLengthLeft(str, i) { if (i <= 0) { return 0; } if ( (i > 1 && str.codePointAt(i - 2) >= kUTF16SurrogateThreshold) || str.codePointAt(i - 1) >= kUTF16SurrogateThreshold ) { return 2; } return 1;}
export function charLengthAt(str, i) { if (str.length <= i) { return 1; } return str.codePointAt(i) >= kUTF16SurrogateThreshold ? 2 : 1;}
export function* emitKeys(stream) { while (true) { let ch = yield; let s = ch; let escaped = false; const key = { sequence: null, name: undefined, ctrl: false, meta: false, shift: false, };
if (ch === kEscape) { escaped = true; s += ch = yield;
if (ch === kEscape) { s += ch = yield; } }
if (escaped && (ch === "O" || ch === "[")) { let code = ch; let modifier = 0;
if (ch === "O") { s += ch = yield;
if (ch >= "0" && ch <= "9") { modifier = (ch >> 0) - 1; s += ch = yield; }
code += ch; } else if (ch === "[") { s += ch = yield;
if (ch === "[") { code += ch; s += ch = yield; }
const cmdStart = s.length - 1;
if (ch >= "0" && ch <= "9") { s += ch = yield;
if (ch >= "0" && ch <= "9") { s += ch = yield; } }
if (ch === ";") { s += ch = yield;
if (ch >= "0" && ch <= "9") { s += yield; } }
const cmd = s.slice(cmdStart); let match;
if ((match = cmd.match(/^(\d\d?)(;(\d))?([~^$])$/))) { code += match[1] + match[4]; modifier = (match[3] || 1) - 1; } else if ( (match = cmd.match(/^((\d;)?(\d))?([A-Za-z])$/)) ) { code += match[4]; modifier = (match[3] || 1) - 1; } else { code += cmd; } }
key.ctrl = !!(modifier & 4); key.meta = !!(modifier & 10); key.shift = !!(modifier & 1); key.code = code;
switch (code) { case "[P": key.name = "f1"; break; case "[Q": key.name = "f2"; break; case "[R": key.name = "f3"; break; case "[S": key.name = "f4"; break;
case "OP": key.name = "f1"; break; case "OQ": key.name = "f2"; break; case "OR": key.name = "f3"; break; case "OS": key.name = "f4"; break;
case "[11~": key.name = "f1"; break; case "[12~": key.name = "f2"; break; case "[13~": key.name = "f3"; break; case "[14~": key.name = "f4"; break;
case "[[A": key.name = "f1"; break; case "[[B": key.name = "f2"; break; case "[[C": key.name = "f3"; break; case "[[D": key.name = "f4"; break; case "[[E": key.name = "f5"; break;
case "[15~": key.name = "f5"; break; case "[17~": key.name = "f6"; break; case "[18~": key.name = "f7"; break; case "[19~": key.name = "f8"; break; case "[20~": key.name = "f9"; break; case "[21~": key.name = "f10"; break; case "[23~": key.name = "f11"; break; case "[24~": key.name = "f12"; break;
case "[A": key.name = "up"; break; case "[B": key.name = "down"; break; case "[C": key.name = "right"; break; case "[D": key.name = "left"; break; case "[E": key.name = "clear"; break; case "[F": key.name = "end"; break; case "[H": key.name = "home"; break;
case "OA": key.name = "up"; break; case "OB": key.name = "down"; break; case "OC": key.name = "right"; break; case "OD": key.name = "left"; break; case "OE": key.name = "clear"; break; case "OF": key.name = "end"; break; case "OH": key.name = "home"; break;
case "[1~": key.name = "home"; break; case "[2~": key.name = "insert"; break; case "[3~": key.name = "delete"; break; case "[4~": key.name = "end"; break; case "[5~": key.name = "pageup"; break; case "[6~": key.name = "pagedown"; break;
case "[[5~": key.name = "pageup"; break; case "[[6~": key.name = "pagedown"; break;
case "[7~": key.name = "home"; break; case "[8~": key.name = "end"; break;
case "[a": key.name = "up"; key.shift = true; break; case "[b": key.name = "down"; key.shift = true; break; case "[c": key.name = "right"; key.shift = true; break; case "[d": key.name = "left"; key.shift = true; break; case "[e": key.name = "clear"; key.shift = true; break;
case "[2$": key.name = "insert"; key.shift = true; break; case "[3$": key.name = "delete"; key.shift = true; break; case "[5$": key.name = "pageup"; key.shift = true; break; case "[6$": key.name = "pagedown"; key.shift = true; break; case "[7$": key.name = "home"; key.shift = true; break; case "[8$": key.name = "end"; key.shift = true; break;
case "Oa": key.name = "up"; key.ctrl = true; break; case "Ob": key.name = "down"; key.ctrl = true; break; case "Oc": key.name = "right"; key.ctrl = true; break; case "Od": key.name = "left"; key.ctrl = true; break; case "Oe": key.name = "clear"; key.ctrl = true; break;
case "[2^": key.name = "insert"; key.ctrl = true; break; case "[3^": key.name = "delete"; key.ctrl = true; break; case "[5^": key.name = "pageup"; key.ctrl = true; break; case "[6^": key.name = "pagedown"; key.ctrl = true; break; case "[7^": key.name = "home"; key.ctrl = true; break; case "[8^": key.name = "end"; key.ctrl = true; break;
case "[Z": key.name = "tab"; key.shift = true; break; default: key.name = "undefined"; break; } } else if (ch === "\r") { key.name = "return"; key.meta = escaped; } else if (ch === "\n") { key.name = "enter"; key.meta = escaped; } else if (ch === "\t") { key.name = "tab"; key.meta = escaped; } else if (ch === "\b" || ch === "\x7f") { key.name = "backspace"; key.meta = escaped; } else if (ch === kEscape) { key.name = "escape"; key.meta = escaped; } else if (ch === " ") { key.name = "space"; key.meta = escaped; } else if (!escaped && ch <= "\x1a") { key.name = String.fromCharCode( ch.charCodeAt() + "a".charCodeAt() - 1, ); key.ctrl = true; } else if (/^[0-9A-Za-z]$/.test(ch)) { key.name = ch.toLowerCase(); key.shift = /^[A-Z]$/.test(ch); key.meta = escaped; } else if (escaped) { key.name = ch.length ? undefined : "escape"; key.meta = true; }
key.sequence = s;
if (s.length !== 0 && (key.name !== undefined || escaped)) { stream.emit("keypress", escaped ? undefined : s, key); } else if (charLengthAt(s, 0) === s.length) { stream.emit("keypress", s, key); } }}
export function commonPrefix(strings) { if (strings.length === 1) { return strings[0]; } const sorted = strings.slice().sort(); const min = sorted[0]; const max = sorted[sorted.length - 1]; for (let i = 0; i < min.length; i++) { if (min[i] !== max[i]) { return min.slice(0, i); } } return min;}
export default { CSI, charLengthAt, charLengthLeft, emitKeys, commonPrefix,};