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'use strict';
const {
ArrayPrototypeForEach,
ArrayPrototypeIncludes,
ArrayPrototypeMap,
ArrayPrototypePush,
ArrayPrototypePushApply,
ArrayPrototypeShift,
ArrayPrototypeSlice,
ArrayPrototypeUnshiftApply,
ObjectEntries,
ObjectPrototypeHasOwnProperty: ObjectHasOwn,
StringPrototypeCharAt,
StringPrototypeIndexOf,
StringPrototypeSlice,
StringPrototypeStartsWith,
} = require('./internal/primordials');
const {
validateArray,
validateBoolean,
validateBooleanArray,
validateObject,
validateString,
validateStringArray,
validateUnion,
} = require('./internal/validators');
const {
kEmptyObject,
} = require('./internal/util');
const {
findLongOptionForShort,
isLoneLongOption,
isLoneShortOption,
isLongOptionAndValue,
isOptionValue,
isOptionLikeValue,
isShortOptionAndValue,
isShortOptionGroup,
useDefaultValueOption,
objectGetOwn,
optionsGetOwn,
} = require('./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 {object} token - from tokens as available from parseArgs
*/
function checkOptionLikeValue(token) {
if (!token.inlineValue && isOptionLikeValue(token.value)) {
// Only show short example if user used short option.
const example = StringPrototypeStartsWith(token.rawName, '--') ?
`'${token.rawName}=-XYZ'` :
`'--${token.name}=-XYZ' or '${token.rawName}-XYZ'`;
const errorMessage = `Option '${token.rawName}' argument is ambiguous.
Did you forget to specify the option argument for '${token.rawName}'?
To specify an option argument starting with a dash use ${example}.`;
throw new ERR_PARSE_ARGS_INVALID_OPTION_VALUE(errorMessage);
}
}
/**
* In strict mode, throw for usage errors.
*
* @param {object} config - from config passed to parseArgs
* @param {object} token - from tokens as available from parseArgs
*/
function checkOptionUsage(config, token) {
if (!ObjectHasOwn(config.options, token.name)) {
throw new ERR_PARSE_ARGS_UNKNOWN_OPTION(
token.rawName, config.allowPositionals);
}
const short = optionsGetOwn(config.options, token.name, 'short');
const shortAndLong = `${short ? `-${short}, ` : ''}--${token.name}`;
const type = optionsGetOwn(config.options, token.name, 'type');
if (type === 'string' && typeof token.value !== 'string') {
throw new ERR_PARSE_ARGS_INVALID_OPTION_VALUE(`Option '${shortAndLong} <value>' argument missing`);
}
// (Idiomatic test for undefined||null, expecting undefined.)
if (type === 'boolean' && token.value != null) {
throw new ERR_PARSE_ARGS_INVALID_OPTION_VALUE(`Option '${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;
}
}
/**
* Store the default option value in `values`.
*
* @param {string} longOption - long option name e.g. 'foo'
* @param {string
* | boolean
* | string[]
* | boolean[]} optionValue - default value from option config
* @param {object} values - option values returned in `values` by parseArgs
*/
function storeDefaultOption(longOption, optionValue, values) {
if (longOption === '__proto__') {
return; // No. Just no.
}
values[longOption] = optionValue;
}
/**
* Process args and turn into identified tokens:
* - option (along with value, if any)
* - positional
* - option-terminator
*
* @param {string[]} args - from parseArgs({ args }) or mainArgs
* @param {object} options - option configs, from parseArgs({ options })
*/
function argsToTokens(args, options) {
const tokens = [];
let index = -1;
let groupCount = 0;
const remainingArgs = ArrayPrototypeSlice(args);
while (remainingArgs.length > 0) {
const arg = ArrayPrototypeShift(remainingArgs);
const nextArg = remainingArgs[0];
if (groupCount > 0)
groupCount--;
else
index++;
// Check if `arg` is an options terminator.
// Guideline 10 in https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap12.html
if (arg === '--') {
// Everything after a bare '--' is considered a positional argument.
ArrayPrototypePush(tokens, { kind: 'option-terminator', index });
ArrayPrototypePushApply(
tokens, ArrayPrototypeMap(remainingArgs, (arg) => {
return { kind: 'positional', index: ++index, value: arg };
})
);
break; // Finished processing args, leave while loop.
}
if (isLoneShortOption(arg)) {
// e.g. '-f'
const shortOption = StringPrototypeCharAt(arg, 1);
const longOption = findLongOptionForShort(shortOption, options);
let value;
let inlineValue;
if (optionsGetOwn(options, longOption, 'type') === 'string' &&
isOptionValue(nextArg)) {
// e.g. '-f', 'bar'
value = ArrayPrototypeShift(remainingArgs);
inlineValue = false;
}
ArrayPrototypePush(
tokens,
{ kind: 'option', name: longOption, rawName: arg,
index, value, inlineValue });
if (value != null) ++index;
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);
groupCount = expanded.length;
continue;
}
if (isShortOptionAndValue(arg, options)) {
// e.g. -fFILE
const shortOption = StringPrototypeCharAt(arg, 1);
const longOption = findLongOptionForShort(shortOption, options);
const value = StringPrototypeSlice(arg, 2);
ArrayPrototypePush(
tokens,
{ kind: 'option', name: longOption, rawName: `-${shortOption}`,
index, value, inlineValue: true });
continue;
}
if (isLoneLongOption(arg)) {
// e.g. '--foo'
const longOption = StringPrototypeSlice(arg, 2);
let value;
let inlineValue;
if (optionsGetOwn(options, longOption, 'type') === 'string' &&
isOptionValue(nextArg)) {
// e.g. '--foo', 'bar'
value = ArrayPrototypeShift(remainingArgs);
inlineValue = false;
}
ArrayPrototypePush(
tokens,
{ kind: 'option', name: longOption, rawName: arg,
index, value, inlineValue });
if (value != null) ++index;
continue;
}
if (isLongOptionAndValue(arg)) {
// e.g. --foo=bar
const equalIndex = StringPrototypeIndexOf(arg, '=');
const longOption = StringPrototypeSlice(arg, 2, equalIndex);
const value = StringPrototypeSlice(arg, equalIndex + 1);
ArrayPrototypePush(
tokens,
{ kind: 'option', name: longOption, rawName: `--${longOption}`,
index, value, inlineValue: true });
continue;
}
ArrayPrototypePush(tokens, { kind: 'positional', index, value: arg });
}
return tokens;
}
const parseArgs = (config = kEmptyObject) => {
const args = objectGetOwn(config, 'args') ?? getMainArgs();
const strict = objectGetOwn(config, 'strict') ?? true;
const allowPositionals = objectGetOwn(config, 'allowPositionals') ?? !strict;
const returnTokens = objectGetOwn(config, 'tokens') ?? false;
const options = objectGetOwn(config, 'options') ?? { __proto__: null };
// Bundle these up for passing to strict-mode checks.
const parseConfig = { args, strict, options, allowPositionals };
// Validate input configuration.
validateArray(args, 'args');
validateBoolean(strict, 'strict');
validateBoolean(allowPositionals, 'allowPositionals');
validateBoolean(returnTokens, 'tokens');
validateObject(options, 'options');
ArrayPrototypeForEach(
ObjectEntries(options),
({ 0: longOption, 1: optionConfig }) => {
validateObject(optionConfig, `options.${longOption}`);
// type is required
const optionType = objectGetOwn(optionConfig, 'type');
validateUnion(optionType, `options.${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'
);
}
}
const multipleOption = objectGetOwn(optionConfig, 'multiple');
if (ObjectHasOwn(optionConfig, 'multiple')) {
validateBoolean(multipleOption, `options.${longOption}.multiple`);
}
const defaultValue = objectGetOwn(optionConfig, 'default');
if (defaultValue !== undefined) {
let validator;
switch (optionType) {
case 'string':
validator = multipleOption ? validateStringArray : validateString;
break;
case 'boolean':
validator = multipleOption ? validateBooleanArray : validateBoolean;
break;
}
validator(defaultValue, `options.${longOption}.default`);
}
}
);
// Phase 1: identify tokens
const tokens = argsToTokens(args, options);
// Phase 2: process tokens into parsed option values and positionals
const result = {
values: { __proto__: null },
positionals: [],
};
if (returnTokens) {
result.tokens = tokens;
}
ArrayPrototypeForEach(tokens, (token) => {
if (token.kind === 'option') {
if (strict) {
checkOptionUsage(parseConfig, token);
checkOptionLikeValue(token);
}
storeOption(token.name, token.value, options, result.values);
} else if (token.kind === 'positional') {
if (!allowPositionals) {
throw new ERR_PARSE_ARGS_UNEXPECTED_POSITIONAL(token.value);
}
ArrayPrototypePush(result.positionals, token.value);
}
});
// Phase 3: fill in default values for missing args
ArrayPrototypeForEach(ObjectEntries(options), ({ 0: longOption,
1: optionConfig }) => {
const mustSetDefault = useDefaultValueOption(longOption,
optionConfig,
result.values);
if (mustSetDefault) {
storeDefaultOption(longOption,
objectGetOwn(optionConfig, 'default'),
result.values);
}
});
return result;
};
module.exports = {
parseArgs,
};