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'use strict';
const {
ArrayPrototypeFind,
ObjectEntries,
ObjectPrototypeHasOwnProperty: ObjectHasOwn,
StringPrototypeCharAt,
StringPrototypeIncludes,
StringPrototypeStartsWith,
} = require('./internal/primordials');
const {
validateObject,
} = require('./internal/validators');
// These are internal utilities to make the parsing logic easier to read, and
// add lots of detail for the curious. They are in a separate file to allow
// unit testing, although that is not essential (this could be rolled into
// main file and just tested implicitly via API).
//
// These routines are for internal use, not for export to client.
/**
* Return the named property, but only if it is an own property.
*/
function objectGetOwn(obj, prop) {
if (ObjectHasOwn(obj, prop))
return obj[prop];
}
/**
* Return the named options property, but only if it is an own property.
*/
function optionsGetOwn(options, longOption, prop) {
if (ObjectHasOwn(options, longOption))
return objectGetOwn(options[longOption], prop);
}
/**
* Determines if the argument may be used as an option value.
* @example
* isOptionValue('V') // returns true
* isOptionValue('-v') // returns true (greedy)
* isOptionValue('--foo') // returns true (greedy)
* isOptionValue(undefined) // returns false
*/
function isOptionValue(value) {
if (value == null) return false;
// Open Group Utility Conventions are that an option-argument
// is the argument after the option, and may start with a dash.
return true; // greedy!
}
/**
* Detect whether there is possible confusion and user may have omitted
* the option argument, like `--port --verbose` when `port` of type:string.
* In strict mode we throw errors if value is option-like.
*/
function isOptionLikeValue(value) {
if (value == null) return false;
return value.length > 1 && StringPrototypeCharAt(value, 0) === '-';
}
/**
* Determines if `arg` is just a short option.
* @example '-f'
*/
function isLoneShortOption(arg) {
return arg.length === 2 &&
StringPrototypeCharAt(arg, 0) === '-' &&
StringPrototypeCharAt(arg, 1) !== '-';
}
/**
* Determines if `arg` is a lone long option.
* @example
* isLoneLongOption('a') // returns false
* isLoneLongOption('-a') // returns false
* isLoneLongOption('--foo') // returns true
* isLoneLongOption('--foo=bar') // returns false
*/
function isLoneLongOption(arg) {
return arg.length > 2 &&
StringPrototypeStartsWith(arg, '--') &&
!StringPrototypeIncludes(arg, '=', 3);
}
/**
* Determines if `arg` is a long option and value in the same argument.
* @example
* isLongOptionAndValue('--foo') // returns false
* isLongOptionAndValue('--foo=bar') // returns true
*/
function isLongOptionAndValue(arg) {
return arg.length > 2 &&
StringPrototypeStartsWith(arg, '--') &&
StringPrototypeIncludes(arg, '=', 3);
}
/**
* Determines if `arg` is a short option group.
*
* See Guideline 5 of the [Open Group Utility Conventions](https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap12.html).
* One or more options without option-arguments, followed by at most one
* option that takes an option-argument, should be accepted when grouped
* behind one '-' delimiter.
* @example
* isShortOptionGroup('-a', {}) // returns false
* isShortOptionGroup('-ab', {}) // returns true
* // -fb is an option and a value, not a short option group
* isShortOptionGroup('-fb', {
* options: { f: { type: 'string' } }
* }) // returns false
* isShortOptionGroup('-bf', {
* options: { f: { type: 'string' } }
* }) // returns true
* // -bfb is an edge case, return true and caller sorts it out
* isShortOptionGroup('-bfb', {
* options: { f: { type: 'string' } }
* }) // returns true
*/
function isShortOptionGroup(arg, options) {
if (arg.length <= 2) return false;
if (StringPrototypeCharAt(arg, 0) !== '-') return false;
if (StringPrototypeCharAt(arg, 1) === '-') return false;
const firstShort = StringPrototypeCharAt(arg, 1);
const longOption = findLongOptionForShort(firstShort, options);
return optionsGetOwn(options, longOption, 'type') !== 'string';
}
/**
* Determine if arg is a short string option followed by its value.
* @example
* isShortOptionAndValue('-a', {}); // returns false
* isShortOptionAndValue('-ab', {}); // returns false
* isShortOptionAndValue('-fFILE', {
* options: { foo: { short: 'f', type: 'string' }}
* }) // returns true
*/
function isShortOptionAndValue(arg, options) {
validateObject(options, 'options');
if (arg.length <= 2) return false;
if (StringPrototypeCharAt(arg, 0) !== '-') return false;
if (StringPrototypeCharAt(arg, 1) === '-') return false;
const shortOption = StringPrototypeCharAt(arg, 1);
const longOption = findLongOptionForShort(shortOption, options);
return optionsGetOwn(options, longOption, 'type') === 'string';
}
/**
* Find the long option associated with a short option. Looks for a configured
* `short` and returns the short option itself if a long option is not found.
* @example
* findLongOptionForShort('a', {}) // returns 'a'
* findLongOptionForShort('b', {
* options: { bar: { short: 'b' } }
* }) // returns 'bar'
*/
function findLongOptionForShort(shortOption, options) {
validateObject(options, 'options');
const longOptionEntry = ArrayPrototypeFind(
ObjectEntries(options),
({ 1: optionConfig }) => objectGetOwn(optionConfig, 'short') === shortOption
);
return longOptionEntry?.[0] ?? shortOption;
}
/**
* Check if the given option includes a default value
* and that option has not been set by the input args.
*
* @param {string} longOption - long option name e.g. 'foo'
* @param {object} optionConfig - the option configuration properties
* @param {object} values - option values returned in `values` by parseArgs
*/
function useDefaultValueOption(longOption, optionConfig, values) {
return objectGetOwn(optionConfig, 'default') !== undefined &&
values[longOption] === undefined;
}
module.exports = {
findLongOptionForShort,
isLoneLongOption,
isLoneShortOption,
isLongOptionAndValue,
isOptionValue,
isOptionLikeValue,
isShortOptionAndValue,
isShortOptionGroup,
useDefaultValueOption,
objectGetOwn,
optionsGetOwn,
};
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