cmd-args-parser/index.js

Command line arguments parser like Angular CLI 😃

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const inputRe = '([^\\s]+)';
function Parser(directives, context = process.argv.slice(2).join(' ')) {
    const tree = {};
    directives.forEach((directive) => {
        const { alias, name, input, flags } = directive;
        const matcher1 = new RegExp(`${name} ${input ? inputRe : ''}`);
        const matcher2 = new RegExp(`${alias} ${input ? inputRe : ''}`);
        const res = matcher(matcher1, context) || matcher(matcher2, context);
        let flagsRes = flags ? matchFlags(flags, context) : null;
        res && (tree[directive.name] = { value: res, flags: flagsRes });
        if (directive.children) {
            directive.children.forEach((child) => {
                const { alias: aliasNest, name: nameNest, input: inputNest, flags: flagsNest, } = child;
                const matcher1 = new RegExp(`${name} ${nameNest} ${inputNest ? inputRe : ''}`);
                const matcher2 = new RegExp(`${alias} ${aliasNest} ${inputNest ? inputRe : ''}`);
                const res = matcher(matcher1, context) || matcher(matcher2, context);
                let flags = flagsNest ? matchFlags(flagsNest, context) : null;
                res && (tree[directive.name] = {});
                res &&
                    (tree[directive.name][child.name] = { value: res, ...(flags && { flags }) });
            });
        }
    });
    return tree;
}
exports.default = Parser;
function matcher(regex, context) {
    const result = regex.exec(context);
    return result && (result[1] || true);
}
function matchFlags(flags, context) {
    const res = {};
    flags.forEach((flag) => {
        const flagName = flag.replace('$', '');
        if (flag.includes('$')) {
            const flagRe = new RegExp(`-?-${flagName}[=\\s]${inputRe}`);
            const result = flagRe.exec(context);
            result && (res[flagName] = result[1] || true);
        }
        else {
            const flagRe = new RegExp(`-?-${flagName}`);
            const result = flagRe.exec(context);
            res[flag] = result ? true : false;
        }
    });
    return res;
}