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148 lines
3.1 KiB
148 lines
3.1 KiB
const { InvalidArgumentError } = require('./error.js');
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// @ts-check
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class Argument {
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/**
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* Initialize a new command argument with the given name and description.
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* The default is that the argument is required, and you can explicitly
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* indicate this with <> around the name. Put [] around the name for an optional argument.
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*
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* @param {string} name
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* @param {string} [description]
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*/
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constructor(name, description) {
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this.description = description || '';
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this.variadic = false;
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this.parseArg = undefined;
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this.defaultValue = undefined;
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this.defaultValueDescription = undefined;
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this.argChoices = undefined;
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switch (name[0]) {
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case '<': // e.g. <required>
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this.required = true;
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this._name = name.slice(1, -1);
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break;
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case '[': // e.g. [optional]
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this.required = false;
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this._name = name.slice(1, -1);
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break;
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default:
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this.required = true;
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this._name = name;
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break;
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}
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if (this._name.length > 3 && this._name.slice(-3) === '...') {
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this.variadic = true;
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this._name = this._name.slice(0, -3);
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}
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}
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/**
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* Return argument name.
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*
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* @return {string}
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*/
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name() {
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return this._name;
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};
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/**
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* @api private
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*/
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_concatValue(value, previous) {
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if (previous === this.defaultValue || !Array.isArray(previous)) {
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return [value];
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}
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return previous.concat(value);
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}
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/**
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* Set the default value, and optionally supply the description to be displayed in the help.
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*
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* @param {any} value
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* @param {string} [description]
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* @return {Argument}
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*/
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default(value, description) {
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this.defaultValue = value;
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this.defaultValueDescription = description;
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return this;
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};
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/**
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* Set the custom handler for processing CLI command arguments into argument values.
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*
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* @param {Function} [fn]
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* @return {Argument}
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*/
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argParser(fn) {
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this.parseArg = fn;
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return this;
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};
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/**
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* Only allow option value to be one of choices.
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*
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* @param {string[]} values
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* @return {Argument}
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*/
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choices(values) {
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this.argChoices = values;
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this.parseArg = (arg, previous) => {
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if (!values.includes(arg)) {
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throw new InvalidArgumentError(`Allowed choices are ${values.join(', ')}.`);
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}
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if (this.variadic) {
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return this._concatValue(arg, previous);
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}
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return arg;
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};
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return this;
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};
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/**
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* Make option-argument required.
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*/
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argRequired() {
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this.required = true;
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return this;
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}
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/**
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* Make option-argument optional.
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*/
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argOptional() {
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this.required = false;
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return this;
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}
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}
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/**
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* Takes an argument and returns its human readable equivalent for help usage.
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*
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* @param {Argument} arg
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* @return {string}
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* @api private
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*/
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function humanReadableArgName(arg) {
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const nameOutput = arg.name() + (arg.variadic === true ? '...' : '');
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return arg.required
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? '<' + nameOutput + '>'
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: '[' + nameOutput + ']';
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}
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exports.Argument = Argument;
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exports.humanReadableArgName = humanReadableArgName;
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