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const {
ArrayPrototypeForEach,
ArrayPrototypeIncludes,
ArrayPrototypePushApply,
ArrayPrototypeShift,
ArrayPrototypeSlice,
ArrayPrototypePush,
ArrayPrototypeUnshiftApply,
ObjectPrototypeHasOwnProperty: ObjectHasOwn,
ObjectEntries,
StringPrototypeCharAt,
StringPrototypeIndexOf,
StringPrototypeSlice,
} = primordials;
const {
validateArray,
validateBoolean,
validateObject,
validateString,
validateUnion,
} = require('internal/validators');
const {
findLongOptionForShort,
isLoneLongOption,
isLoneShortOption,
isLongOptionAndValue,
isOptionValue,
isOptionLikeValue,
isShortOptionAndValue,
isShortOptionGroup,
objectGetOwn,
optionsGetOwn,
} = require('internal/util/parse_args/utils');
const {
codes: {
ERR_INVALID_ARG_VALUE,
ERR_PARSE_ARGS_INVALID_OPTION_VALUE,
ERR_PARSE_ARGS_UNKNOWN_OPTION,
ERR_PARSE_ARGS_UNEXPECTED_POSITIONAL,
},
} = require('internal/errors');
function getMainArgs() {
// Work out where to slice process.argv for user supplied arguments.
// Check node options for scenarios where user CLI args follow executable.
const execArgv = process.execArgv;
if (ArrayPrototypeIncludes(execArgv, '-e') ||
ArrayPrototypeIncludes(execArgv, '--eval') ||
ArrayPrototypeIncludes(execArgv, '-p') ||
ArrayPrototypeIncludes(execArgv, '--print')) {
return ArrayPrototypeSlice(process.argv, 1);
}
// Normally first two arguments are executable and script, then CLI arguments
return ArrayPrototypeSlice(process.argv, 2);
}
/**
* In strict mode, throw for possible usage errors like --foo --bar
*
* @param {string} longOption - long option name e.g. 'foo'
* @param {string|undefined} optionValue - value from user args
* @param {string} shortOrLong - option used, with dashes e.g. `-l` or `--long`
* @param {boolean} strict - show errors, from parseArgs({ strict })
*/
function checkOptionLikeValue(longOption, optionValue, shortOrLong, strict) {
if (strict && isOptionLikeValue(optionValue)) {
// Only show short example if user used short option.
const example = (shortOrLong.length === 2) ?
`'--${longOption}=-XYZ' or '${shortOrLong}-XYZ'` :
`'--${longOption}=-XYZ'`;
const errorMessage = `Option '${shortOrLong}' argument is ambiguous.
Did you forget to specify the option argument for '${shortOrLong}'?
To specify an option argument starting with a dash use ${example}.`;
throw new ERR_PARSE_ARGS_INVALID_OPTION_VALUE(errorMessage);
}
}
/**
* In strict mode, throw for usage errors.
*
* @param {string} longOption - long option name e.g. 'foo'
* @param {string|undefined} optionValue - value from user args
* @param {object} options - option configs, from parseArgs({ options })
* @param {string} shortOrLong - option used, with dashes e.g. `-l` or `--long`
* @param {boolean} strict - show errors, from parseArgs({ strict })
* @param {boolean} allowPositionals - from parseArgs({ allowPositionals })
*/
function checkOptionUsage(longOption, optionValue, options,
shortOrLong, strict, allowPositionals) {
// Strict and options are used from local context.
if (!strict) return;
if (!ObjectHasOwn(options, longOption)) {
throw new ERR_PARSE_ARGS_UNKNOWN_OPTION(shortOrLong, allowPositionals);
}
const short = optionsGetOwn(options, longOption, 'short');
const shortAndLong = short ? `-${short}, --${longOption}` : `--${longOption}`;
const type = optionsGetOwn(options, longOption, 'type');
if (type === 'string' && typeof optionValue !== 'string') {
throw new ERR_PARSE_ARGS_INVALID_OPTION_VALUE(`Option '${shortAndLong} <value>' argument missing`);
}
// (Idiomatic test for undefined||null, expecting undefined.)
if (type === 'boolean' && optionValue != null) {
throw new ERR_PARSE_ARGS_INVALID_OPTION_VALUE(`Option '${shortAndLong}' does not take an argument`);
}
}
/**
* Store the option value in `values`.
*
* @param {string} longOption - long option name e.g. 'foo'
* @param {string|undefined} optionValue - value from user args
* @param {object} options - option configs, from parseArgs({ options })
* @param {object} values - option values returned in `values` by parseArgs
*/
function storeOption(longOption, optionValue, options, values) {
if (longOption === '__proto__') {
return; // No. Just no.
}
// We store based on the option value rather than option type,
// preserving the users intent for author to deal with.
const newValue = optionValue ?? true;
if (optionsGetOwn(options, longOption, 'multiple')) {
// Always store value in array, including for boolean.
// values[longOption] starts out not present,
// first value is added as new array [newValue],
// subsequent values are pushed to existing array.
// (note: values has null prototype, so simpler usage)
if (values[longOption]) {
ArrayPrototypePush(values[longOption], newValue);
} else {
values[longOption] = [newValue];
}
} else {
values[longOption] = newValue;
}
}
const parseArgs = (config = { __proto__: null }) => {
const args = objectGetOwn(config, 'args') ?? getMainArgs();
const strict = objectGetOwn(config, 'strict') ?? true;
const allowPositionals = objectGetOwn(config, 'allowPositionals') ?? !strict;
const options = objectGetOwn(config, 'options') ?? { __proto__: null };
// Validate input configuration.
validateArray(args, 'args');
validateBoolean(strict, 'strict');
validateBoolean(allowPositionals, 'allowPositionals');
validateObject(options, 'options');
ArrayPrototypeForEach(
ObjectEntries(options),
({ 0: longOption, 1: optionConfig }) => {
validateObject(optionConfig, `options.${longOption}`);
// type is required
validateUnion(objectGetOwn(optionConfig, 'type'), `options.${longOption}.type`, ['string', 'boolean']);
if (ObjectHasOwn(optionConfig, 'short')) {
const shortOption = optionConfig.short;
validateString(shortOption, `options.${longOption}.short`);
if (shortOption.length !== 1) {
throw new ERR_INVALID_ARG_VALUE(
`options.${longOption}.short`,
shortOption,
'must be a single character'
);
}
}
if (ObjectHasOwn(optionConfig, 'multiple')) {
validateBoolean(optionConfig.multiple, `options.${longOption}.multiple`);
}
}
);
const result = {
values: { __proto__: null },
positionals: []
};
const remainingArgs = ArrayPrototypeSlice(args);
while (remainingArgs.length > 0) {
const arg = ArrayPrototypeShift(remainingArgs);
const nextArg = remainingArgs[0];
// Check if `arg` is an options terminator.
// Guideline 10 in https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap12.html
if (arg === '--') {
if (!allowPositionals && remainingArgs.length > 0) {
throw new ERR_PARSE_ARGS_UNEXPECTED_POSITIONAL(nextArg);
}
// Everything after a bare '--' is considered a positional argument.
ArrayPrototypePushApply(
result.positionals,
remainingArgs
);
break; // Finished processing args, leave while loop.
}
if (isLoneShortOption(arg)) {
// e.g. '-f'
const shortOption = StringPrototypeCharAt(arg, 1);
const longOption = findLongOptionForShort(shortOption, options);
let optionValue;
if (optionsGetOwn(options, longOption, 'type') === 'string' &&
isOptionValue(nextArg)) {
// e.g. '-f', 'bar'
optionValue = ArrayPrototypeShift(remainingArgs);
checkOptionLikeValue(longOption, optionValue, arg, strict);
}
checkOptionUsage(longOption, optionValue, options,
arg, strict, allowPositionals);
storeOption(longOption, optionValue, options, result.values);
continue;
}
if (isShortOptionGroup(arg, options)) {
// Expand -fXzy to -f -X -z -y
const expanded = [];
for (let index = 1; index < arg.length; index++) {
const shortOption = StringPrototypeCharAt(arg, index);
const longOption = findLongOptionForShort(shortOption, options);
if (optionsGetOwn(options, longOption, 'type') !== 'string' ||
index === arg.length - 1) {
// Boolean option, or last short in group. Well formed.
ArrayPrototypePush(expanded, `-${shortOption}`);
} else {
// String option in middle. Yuck.
// Expand -abfFILE to -a -b -fFILE
ArrayPrototypePush(expanded, `-${StringPrototypeSlice(arg, index)}`);
break; // finished short group
}
}
ArrayPrototypeUnshiftApply(remainingArgs, expanded);
continue;
}
if (isShortOptionAndValue(arg, options)) {
// e.g. -fFILE
const shortOption = StringPrototypeCharAt(arg, 1);
const longOption = findLongOptionForShort(shortOption, options);
const optionValue = StringPrototypeSlice(arg, 2);
checkOptionUsage(longOption, optionValue, options, `-${shortOption}`, strict, allowPositionals);
storeOption(longOption, optionValue, options, result.values);
continue;
}
if (isLoneLongOption(arg)) {
// e.g. '--foo'
const longOption = StringPrototypeSlice(arg, 2);
let optionValue;
if (optionsGetOwn(options, longOption, 'type') === 'string' &&
isOptionValue(nextArg)) {
// e.g. '--foo', 'bar'
optionValue = ArrayPrototypeShift(remainingArgs);
checkOptionLikeValue(longOption, optionValue, arg, strict);
}
checkOptionUsage(longOption, optionValue, options,
arg, strict, allowPositionals);
storeOption(longOption, optionValue, options, result.values);
continue;
}
if (isLongOptionAndValue(arg)) {
// e.g. --foo=bar
const index = StringPrototypeIndexOf(arg, '=');
const longOption = StringPrototypeSlice(arg, 2, index);
const optionValue = StringPrototypeSlice(arg, index + 1);
checkOptionUsage(longOption, optionValue, options, `--${longOption}`, strict, allowPositionals);
storeOption(longOption, optionValue, options, result.values);
continue;
}
// Anything left is a positional
if (!allowPositionals) {
throw new ERR_PARSE_ARGS_UNEXPECTED_POSITIONAL(arg);
}
ArrayPrototypePush(result.positionals, arg);
}
return result;
};
module.exports = {
parseArgs,
};
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