@seriousme/opifex/dist/utils/args.js

MQTT client & server for Deno & NodeJS

function formatValue(key, value, boolean, string) {
    if (key === "__proto__" || key === "constructor") {
        throw new Error(`Invalid argument: ${key}`);
    }
    if (boolean.includes(key)) {
        if (value !== "false") {
            return true;
        }
        return false;
    }
    if (!string.includes(key)) {
        const num = Number(value);
        if (!Number.isNaN(num)) {
            return num;
        }
    }
    return value;
}
function parseKeyValue(arg, alias) {
    if (arg.startsWith("--no-")) {
        const key = arg.slice(5);
        return [key, false];
    }
    if (arg.startsWith("--")) {
        const [key, value] = arg.slice(2).split("=", 2);
        return [key, value];
    }
    if (arg.startsWith("-")) {
        const [flag, value] = arg.slice(1).split("=", 2);
        const key = alias[flag] || flag;
        return [key, value];
    }
    return ["_", arg];
}
/**
 *  a parser for command line arguments
 * @param args the arguments to parse
 * @param opts the options for the parser
 * @returns the parsed arguments
 *
 * @example
 * const args = parseArgs(args, {
 *  alias: { h: "help" },
 *  boolean: ["help"],
 *  string: ["port"],
 *  default: { port: 3000 },
 * });
 */
export function parseArgs(args, opts = {}) {
    const { alias = {}, boolean = [], string = [], default: defaults = {} } = opts;
    const result = { ...defaults };
    result["_"] = [];
    for (let i = 0; i < args.length; i++) {
        const [key, value] = parseKeyValue(args[i], alias);
        if (key === "_") {
            result["_"].push(formatValue(key, value, boolean, string));
            continue;
        }
        if (value === undefined) {
            const nextArg = args[i + 1];
            if (nextArg !== undefined &&
                !nextArg.startsWith("-") &&
                !boolean.includes(key)) {
                result[key] = formatValue(key, nextArg, boolean, string);
                i++;
            }
            else {
                result[key] = formatValue(key, value, boolean, string);
            }
            continue;
        }
        result[key] = formatValue(key, value, boolean, string);
    }
    return result;
}
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