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import { createInterface, Interface } from "readline";
import { red } from "colors";
export interface Configuration {
identifier: string;
onInvalid?: (culprit?: string) => string | string;
isCaseSensitive?: boolean;
}
export interface Registration {
argPattern: RegExp[];
action: (parsedArgs: IterableIterator<string>) => any | Promise<any>;
}
export default class InputManager {
private identifier: string;
private onInvalid: ((culprit?: string) => string) | string;
private isCaseSensitive: boolean;
private commandMap = new Map<string, Registration[]>();
public interface: Interface;
private busy = false;
private keys: string | undefined;
constructor({ identifier: prompt, onInvalid, isCaseSensitive }: Configuration) {
this.identifier = prompt;
this.onInvalid = onInvalid || this.usage;
this.isCaseSensitive = isCaseSensitive ?? true;
this.interface = createInterface(process.stdin, process.stdout).on('line', this.considerInput);
}
private usage = () => {
const resolved = this.keys;
if (resolved) {
return resolved;
}
const members: string[] = [];
const keys = this.commandMap.keys();
let next: IteratorResult<string>;
while (!(next = keys.next()).done) {
members.push(next.value);
}
return `${this.identifier} commands: { ${members.sort().join(", ")} }`;
}
public registerCommand = (basename: string, argPattern: RegExp[], action: any | Promise<any>) => {
const existing = this.commandMap.get(basename);
const registration = { argPattern, action };
if (existing) {
existing.push(registration);
} else {
this.commandMap.set(basename, [registration]);
}
}
private invalid = (culprit?: string) => {
console.log(red(typeof this.onInvalid === "string" ? this.onInvalid : this.onInvalid(culprit)));
this.busy = false;
}
private considerInput = async (line: string) => {
if (this.busy) {
console.log(red("Busy"));
return;
}
this.busy = true;
line = line.trim();
if (this.isCaseSensitive) {
line = line.toLowerCase();
}
const [command, ...args] = line.split(/\s+/g);
if (!command) {
return this.invalid();
}
const registered = this.commandMap.get(command);
if (registered) {
const { length } = args;
const candidates = registered.filter(({ argPattern: { length: count } }) => count === length);
for (const { argPattern, action } of candidates) {
const parsed: string[] = [];
let matched = false;
if (length) {
for (let i = 0; i < length; i++) {
let matches: RegExpExecArray | null;
if ((matches = argPattern[i].exec(args[i])) === null) {
break;
}
parsed.push(matches[0]);
}
matched = true;
}
if (!length || matched) {
await action(parsed[Symbol.iterator]());
this.busy = false;
return;
}
}
}
this.invalid(command);
}
}
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