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Editing File: /usr/share/nodejs/commander/lib/option.js

const { InvalidArgumentError } = require('./error.js');

// @ts-check

class Option {
  /**
   * Initialize a new `Option` with the given `flags` and `description`.
   *
   * @param {string} flags
   * @param {string} [description]
   */

constructor(flags, description) {
    this.flags = flags;
    this.description = description || '';

this.required = flags.includes('<'); // A value must be supplied when the option is specified.
    this.optional = flags.includes('['); // A value is optional when the option is specified.
    // variadic test ignores <value,...> et al which might be used to describe custom splitting of single argument
    this.variadic = /\w\.\.\.[>\]]$/.test(flags); // The option can take multiple values.
    this.mandatory = false; // The option must have a value after parsing, which usually means it must be specified on command line.
    const optionFlags = splitOptionFlags(flags);
    this.short = optionFlags.shortFlag;
    this.long = optionFlags.longFlag;
    this.negate = false;
    if (this.long) {
      this.negate = this.long.startsWith('--no-');
    }
    this.defaultValue = undefined;
    this.defaultValueDescription = undefined;
    this.presetArg = undefined;
    this.envVar = undefined;
    this.parseArg = undefined;
    this.hidden = false;
    this.argChoices = undefined;
  }

/**
   * Set the default value, and optionally supply the description to be displayed in the help.
   *
   * @param {any} value
   * @param {string} [description]
   * @return {Option}
   */

default(value, description) {
    this.defaultValue = value;
    this.defaultValueDescription = description;
    return this;
  }

/**
   * Preset to use when option used without option-argument, especially optional but also boolean and negated.
   * The custom processing (parseArg) is called.
   *
   * @example
   * new Option('--color').default('GREYSCALE').preset('RGB');
   * new Option('--donate [amount]').preset('20').argParser(parseFloat);
   *
   * @param {any} arg
   * @return {Option}
   */

preset(arg) {
    this.presetArg = arg;
    return this;
  }

/**
   * Set environment variable to check for option value.
   * Priority order of option values is default < env < cli
   *
   * @param {string} name
   * @return {Option}
   */

env(name) {
    this.envVar = name;
    return this;
  }

/**
   * Set the custom handler for processing CLI option arguments into option values.
   *
   * @param {Function} [fn]
   * @return {Option}
   */

argParser(fn) {
    this.parseArg = fn;
    return this;
  }

/**
   * Whether the option is mandatory and must have a value after parsing.
   *
   * @param {boolean} [mandatory=true]
   * @return {Option}
   */

makeOptionMandatory(mandatory = true) {
    this.mandatory = !!mandatory;
    return this;
  }

/**
   * Hide option in help.
   *
   * @param {boolean} [hide=true]
   * @return {Option}
   */

hideHelp(hide = true) {
    this.hidden = !!hide;
    return this;
  }

/**
   * @api private
   */

_concatValue(value, previous) {
    if (previous === this.defaultValue || !Array.isArray(previous)) {
      return [value];
    }

return previous.concat(value);
  }

/**
   * Only allow option value to be one of choices.
   *
   * @param {string[]} values
   * @return {Option}
   */

choices(values) {
    this.argChoices = values.slice();
    this.parseArg = (arg, previous) => {
      if (!this.argChoices.includes(arg)) {
        throw new InvalidArgumentError(`Allowed choices are ${this.argChoices.join(', ')}.`);
      }
      if (this.variadic) {
        return this._concatValue(arg, previous);
      }
      return arg;
    };
    return this;
  }

/**
   * Return option name.
   *
   * @return {string}
   */

name() {
    if (this.long) {
      return this.long.replace(/^--/, '');
    }
    return this.short.replace(/^-/, '');
  }

/**
   * Return option name, in a camelcase format that can be used
   * as a object attribute key.
   *
   * @return {string}
   * @api private
   */

attributeName() {
    return camelcase(this.name().replace(/^no-/, ''));
  }

/**
   * Check if `arg` matches the short or long flag.
   *
   * @param {string} arg
   * @return {boolean}
   * @api private
   */

is(arg) {
    return this.short === arg || this.long === arg;
  }

/**
   * Return whether a boolean option.
   *
   * Options are one of boolean, negated, required argument, or optional argument.
   *
   * @return {boolean}
   * @api private
   */

isBoolean() {
    return !this.required && !this.optional && !this.negate;
  }
}

/**
 * Convert string from kebab-case to camelCase.
 *
 * @param {string} str
 * @return {string}
 * @api private
 */

function camelcase(str) {
  return str.split('-').reduce((str, word) => {
    return str + word[0].toUpperCase() + word.slice(1);
  });
}

/**
 * Split the short and long flag out of something like '-m,--mixed <value>'
 *
 * @api private
 */

exports.Option = Option;
exports.splitOptionFlags = splitOptionFlags;

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