Mini Shell
var camelCase = require('camelcase')
var decamelize = require('decamelize')
var path = require('path')
var tokenizeArgString = require('./lib/tokenize-arg-string')
var util = require('util')
function parse (args, opts) {
if (!opts) opts = {}
// allow a string argument to be passed in rather
// than an argv array.
args = tokenizeArgString(args)
// aliases might have transitive relationships, normalize this.
var aliases = combineAliases(opts.alias || {})
var configuration = Object.assign({
'short-option-groups': true,
'camel-case-expansion': true,
'dot-notation': true,
'parse-numbers': true,
'boolean-negation': true,
'negation-prefix': 'no-',
'duplicate-arguments-array': true,
'flatten-duplicate-arrays': true,
'populate--': false,
'combine-arrays': false,
'set-placeholder-key': false,
'halt-at-non-option': false,
'strip-aliased': false,
'strip-dashed': false,
'unknown-options-as-args': false
}, opts.configuration)
var defaults = opts.default || {}
var configObjects = opts.configObjects || []
var envPrefix = opts.envPrefix
var notFlagsOption = configuration['populate--']
var notFlagsArgv = notFlagsOption ? '--' : '_'
var newAliases = {}
// allow a i18n handler to be passed in, default to a fake one (util.format).
var __ = opts.__ || util.format
var error = null
var flags = {
aliases: {},
arrays: {},
bools: {},
strings: {},
numbers: {},
counts: {},
normalize: {},
configs: {},
nargs: {},
coercions: {},
keys: []
}
var negative = /^-[0-9]+(\.[0-9]+)?/
var negatedBoolean = new RegExp('^--' + configuration['negation-prefix'] + '(.+)')
;[].concat(opts.array).filter(Boolean).forEach(function (opt) {
var key = opt.key || opt
// assign to flags[bools|strings|numbers]
const assignment = Object.keys(opt).map(function (key) {
return ({
boolean: 'bools',
string: 'strings',
number: 'numbers'
})[key]
}).filter(Boolean).pop()
// assign key to be coerced
if (assignment) {
flags[assignment][key] = true
}
flags.arrays[key] = true
flags.keys.push(key)
})
;[].concat(opts.boolean).filter(Boolean).forEach(function (key) {
flags.bools[key] = true
flags.keys.push(key)
})
;[].concat(opts.string).filter(Boolean).forEach(function (key) {
flags.strings[key] = true
flags.keys.push(key)
})
;[].concat(opts.number).filter(Boolean).forEach(function (key) {
flags.numbers[key] = true
flags.keys.push(key)
})
;[].concat(opts.count).filter(Boolean).forEach(function (key) {
flags.counts[key] = true
flags.keys.push(key)
})
;[].concat(opts.normalize).filter(Boolean).forEach(function (key) {
flags.normalize[key] = true
flags.keys.push(key)
})
Object.keys(opts.narg || {}).forEach(function (k) {
flags.nargs[k] = opts.narg[k]
flags.keys.push(k)
})
Object.keys(opts.coerce || {}).forEach(function (k) {
flags.coercions[k] = opts.coerce[k]
flags.keys.push(k)
})
if (Array.isArray(opts.config) || typeof opts.config === 'string') {
;[].concat(opts.config).filter(Boolean).forEach(function (key) {
flags.configs[key] = true
})
} else {
Object.keys(opts.config || {}).forEach(function (k) {
flags.configs[k] = opts.config[k]
})
}
// create a lookup table that takes into account all
// combinations of aliases: {f: ['foo'], foo: ['f']}
extendAliases(opts.key, aliases, opts.default, flags.arrays)
// apply default values to all aliases.
Object.keys(defaults).forEach(function (key) {
(flags.aliases[key] || []).forEach(function (alias) {
defaults[alias] = defaults[key]
})
})
var argv = { _: [] }
var notFlags = []
for (var i = 0; i < args.length; i++) {
var arg = args[i]
var broken
var key
var letters
var m
var next
var value
if (isUnknownOptionAsArg(arg)) {
argv._.push(arg)
// -- separated by =
} else if (arg.match(/^--.+=/) || (
!configuration['short-option-groups'] && arg.match(/^-.+=/)
)) {
// Using [\s\S] instead of . because js doesn't support the
// 'dotall' regex modifier. See:
// http://stackoverflow.com/a/1068308/13216
m = arg.match(/^--?([^=]+)=([\s\S]*)$/)
// nargs format = '--f=monkey washing cat'
if (checkAllAliases(m[1], flags.nargs)) {
args.splice(i + 1, 0, m[2])
i = eatNargs(i, m[1], args)
// arrays format = '--f=a b c'
} else if (checkAllAliases(m[1], flags.arrays)) {
args.splice(i + 1, 0, m[2])
i = eatArray(i, m[1], args)
} else {
setArg(m[1], m[2])
}
} else if (arg.match(negatedBoolean) && configuration['boolean-negation']) {
key = arg.match(negatedBoolean)[1]
setArg(key, checkAllAliases(key, flags.arrays) ? [false] : false)
// -- separated by space.
} else if (arg.match(/^--.+/) || (
!configuration['short-option-groups'] && arg.match(/^-[^-]+/)
)) {
key = arg.match(/^--?(.+)/)[1]
// nargs format = '--foo a b c'
// should be truthy even if: flags.nargs[key] === 0
if (checkAllAliases(key, flags.nargs) !== false) {
i = eatNargs(i, key, args)
// array format = '--foo a b c'
} else if (checkAllAliases(key, flags.arrays)) {
i = eatArray(i, key, args)
} else {
next = args[i + 1]
if (next !== undefined && (!next.match(/^-/) ||
next.match(negative)) &&
!checkAllAliases(key, flags.bools) &&
!checkAllAliases(key, flags.counts)) {
setArg(key, next)
i++
} else if (/^(true|false)$/.test(next)) {
setArg(key, next)
i++
} else {
setArg(key, defaultValue(key))
}
}
// dot-notation flag separated by '='.
} else if (arg.match(/^-.\..+=/)) {
m = arg.match(/^-([^=]+)=([\s\S]*)$/)
setArg(m[1], m[2])
// dot-notation flag separated by space.
} else if (arg.match(/^-.\..+/)) {
next = args[i + 1]
key = arg.match(/^-(.\..+)/)[1]
if (next !== undefined && !next.match(/^-/) &&
!checkAllAliases(key, flags.bools) &&
!checkAllAliases(key, flags.counts)) {
setArg(key, next)
i++
} else {
setArg(key, defaultValue(key))
}
} else if (arg.match(/^-[^-]+/) && !arg.match(negative)) {
letters = arg.slice(1, -1).split('')
broken = false
for (var j = 0; j < letters.length; j++) {
next = arg.slice(j + 2)
if (letters[j + 1] && letters[j + 1] === '=') {
value = arg.slice(j + 3)
key = letters[j]
// nargs format = '-f=monkey washing cat'
if (checkAllAliases(key, flags.nargs)) {
args.splice(i + 1, 0, value)
i = eatNargs(i, key, args)
// array format = '-f=a b c'
} else if (checkAllAliases(key, flags.arrays)) {
args.splice(i + 1, 0, value)
i = eatArray(i, key, args)
} else {
setArg(key, value)
}
broken = true
break
}
if (next === '-') {
setArg(letters[j], next)
continue
}
// current letter is an alphabetic character and next value is a number
if (/[A-Za-z]/.test(letters[j]) &&
/^-?\d+(\.\d*)?(e-?\d+)?$/.test(next)) {
setArg(letters[j], next)
broken = true
break
}
if (letters[j + 1] && letters[j + 1].match(/\W/)) {
setArg(letters[j], next)
broken = true
break
} else {
setArg(letters[j], defaultValue(letters[j]))
}
}
key = arg.slice(-1)[0]
if (!broken && key !== '-') {
// nargs format = '-f a b c'
// should be truthy even if: flags.nargs[key] === 0
if (checkAllAliases(key, flags.nargs) !== false) {
i = eatNargs(i, key, args)
// array format = '-f a b c'
} else if (checkAllAliases(key, flags.arrays)) {
i = eatArray(i, key, args)
} else {
next = args[i + 1]
if (next !== undefined && (!/^(-|--)[^-]/.test(next) ||
next.match(negative)) &&
!checkAllAliases(key, flags.bools) &&
!checkAllAliases(key, flags.counts)) {
setArg(key, next)
i++
} else if (/^(true|false)$/.test(next)) {
setArg(key, next)
i++
} else {
setArg(key, defaultValue(key))
}
}
}
} else if (arg === '--') {
notFlags = args.slice(i + 1)
break
} else if (configuration['halt-at-non-option']) {
notFlags = args.slice(i)
break
} else {
argv._.push(maybeCoerceNumber('_', arg))
}
}
// order of precedence:
// 1. command line arg
// 2. value from env var
// 3. value from config file
// 4. value from config objects
// 5. configured default value
applyEnvVars(argv, true) // special case: check env vars that point to config file
applyEnvVars(argv, false)
setConfig(argv)
setConfigObjects()
applyDefaultsAndAliases(argv, flags.aliases, defaults)
applyCoercions(argv)
if (configuration['set-placeholder-key']) setPlaceholderKeys(argv)
// for any counts either not in args or without an explicit default, set to 0
Object.keys(flags.counts).forEach(function (key) {
if (!hasKey(argv, key.split('.'))) setArg(key, 0)
})
// '--' defaults to undefined.
if (notFlagsOption && notFlags.length) argv[notFlagsArgv] = []
notFlags.forEach(function (key) {
argv[notFlagsArgv].push(key)
})
if (configuration['camel-case-expansion'] && configuration['strip-dashed']) {
Object.keys(argv).filter(key => key !== '--' && key.includes('-')).forEach(key => {
delete argv[key]
})
}
if (configuration['strip-aliased']) {
// XXX Switch to [].concat(...Object.values(aliases)) once node.js 6 is dropped
;[].concat(...Object.keys(aliases).map(k => aliases[k])).forEach(alias => {
if (configuration['camel-case-expansion']) {
delete argv[alias.split('.').map(prop => camelCase(prop)).join('.')]
}
delete argv[alias]
})
}
// how many arguments should we consume, based
// on the nargs option?
function eatNargs (i, key, args) {
var ii
const toEat = checkAllAliases(key, flags.nargs)
if (toEat === 0) {
setArg(key, defaultValue(key))
return i
}
// nargs will not consume flag arguments, e.g., -abc, --foo,
// and terminates when one is observed.
var available = 0
for (ii = i + 1; ii < args.length; ii++) {
if (!args[ii].match(/^-[^0-9]/) || isUnknownOptionAsArg(args[ii])) available++
else break
}
if (available < toEat) error = Error(__('Not enough arguments following: %s', key))
const consumed = Math.min(available, toEat)
for (ii = i + 1; ii < (consumed + i + 1); ii++) {
setArg(key, args[ii])
}
return (i + consumed)
}
// if an option is an array, eat all non-hyphenated arguments
// following it... YUM!
// e.g., --foo apple banana cat becomes ["apple", "banana", "cat"]
function eatArray (i, key, args) {
let argsToSet = []
let next = args[i + 1]
if (checkAllAliases(key, flags.bools) && !(/^(true|false)$/.test(next))) {
argsToSet.push(true)
} else if (isUndefined(next) || (/^-/.test(next) && !negative.test(next) && !isUnknownOptionAsArg(next))) {
// for keys without value ==> argsToSet remains an empty []
// set user default value, if available
if (defaults.hasOwnProperty(key)) {
argsToSet.push(defaults[key])
}
} else {
for (var ii = i + 1; ii < args.length; ii++) {
next = args[ii]
if (/^-/.test(next) && !negative.test(next) && !isUnknownOptionAsArg(next)) break
i = ii
argsToSet.push(processValue(key, next))
}
}
setArg(key, argsToSet)
return i
}
function setArg (key, val) {
if (/-/.test(key) && configuration['camel-case-expansion']) {
var alias = key.split('.').map(function (prop) {
return camelCase(prop)
}).join('.')
addNewAlias(key, alias)
}
var value = processValue(key, val)
var splitKey = key.split('.')
setKey(argv, splitKey, value)
// handle populating aliases of the full key
if (flags.aliases[key] && flags.aliases[key].forEach) {
flags.aliases[key].forEach(function (x) {
x = x.split('.')
setKey(argv, x, value)
})
}
// handle populating aliases of the first element of the dot-notation key
if (splitKey.length > 1 && configuration['dot-notation']) {
;(flags.aliases[splitKey[0]] || []).forEach(function (x) {
x = x.split('.')
// expand alias with nested objects in key
var a = [].concat(splitKey)
a.shift() // nuke the old key.
x = x.concat(a)
setKey(argv, x, value)
})
}
// Set normalize getter and setter when key is in 'normalize' but isn't an array
if (checkAllAliases(key, flags.normalize) && !checkAllAliases(key, flags.arrays)) {
var keys = [key].concat(flags.aliases[key] || [])
keys.forEach(function (key) {
argv.__defineSetter__(key, function (v) {
val = path.normalize(v)
})
argv.__defineGetter__(key, function () {
return typeof val === 'string' ? path.normalize(val) : val
})
})
}
}
function addNewAlias (key, alias) {
if (!(flags.aliases[key] && flags.aliases[key].length)) {
flags.aliases[key] = [alias]
newAliases[alias] = true
}
if (!(flags.aliases[alias] && flags.aliases[alias].length)) {
addNewAlias(alias, key)
}
}
function processValue (key, val) {
// strings may be quoted, clean this up as we assign values.
if (typeof val === 'string' &&
(val[0] === "'" || val[0] === '"') &&
val[val.length - 1] === val[0]
) {
val = val.substring(1, val.length - 1)
}
// handle parsing boolean arguments --foo=true --bar false.
if (checkAllAliases(key, flags.bools) || checkAllAliases(key, flags.counts)) {
if (typeof val === 'string') val = val === 'true'
}
var value = Array.isArray(val)
? val.map(function (v) { return maybeCoerceNumber(key, v) })
: maybeCoerceNumber(key, val)
// increment a count given as arg (either no value or value parsed as boolean)
if (checkAllAliases(key, flags.counts) && (isUndefined(value) || typeof value === 'boolean')) {
value = increment
}
// Set normalized value when key is in 'normalize' and in 'arrays'
if (checkAllAliases(key, flags.normalize) && checkAllAliases(key, flags.arrays)) {
if (Array.isArray(val)) value = val.map(path.normalize)
else value = path.normalize(val)
}
return value
}
function maybeCoerceNumber (key, value) {
if (!checkAllAliases(key, flags.strings) && !checkAllAliases(key, flags.bools) && !Array.isArray(value)) {
const shouldCoerceNumber = isNumber(value) && configuration['parse-numbers'] && (
Number.isSafeInteger(Math.floor(value))
)
if (shouldCoerceNumber || (!isUndefined(value) && checkAllAliases(key, flags.numbers))) value = Number(value)
}
return value
}
// set args from config.json file, this should be
// applied last so that defaults can be applied.
function setConfig (argv) {
var configLookup = {}
// expand defaults/aliases, in-case any happen to reference
// the config.json file.
applyDefaultsAndAliases(configLookup, flags.aliases, defaults)
Object.keys(flags.configs).forEach(function (configKey) {
var configPath = argv[configKey] || configLookup[configKey]
if (configPath) {
try {
var config = null
var resolvedConfigPath = path.resolve(process.cwd(), configPath)
if (typeof flags.configs[configKey] === 'function') {
try {
config = flags.configs[configKey](resolvedConfigPath)
} catch (e) {
config = e
}
if (config instanceof Error) {
error = config
return
}
} else {
config = require(resolvedConfigPath)
}
setConfigObject(config)
} catch (ex) {
if (argv[configKey]) error = Error(__('Invalid JSON config file: %s', configPath))
}
}
})
}
// set args from config object.
// it recursively checks nested objects.
function setConfigObject (config, prev) {
Object.keys(config).forEach(function (key) {
var value = config[key]
var fullKey = prev ? prev + '.' + key : key
// if the value is an inner object and we have dot-notation
// enabled, treat inner objects in config the same as
// heavily nested dot notations (foo.bar.apple).
if (typeof value === 'object' && value !== null && !Array.isArray(value) && configuration['dot-notation']) {
// if the value is an object but not an array, check nested object
setConfigObject(value, fullKey)
} else {
// setting arguments via CLI takes precedence over
// values within the config file.
if (!hasKey(argv, fullKey.split('.')) || (checkAllAliases(fullKey, flags.arrays) && configuration['combine-arrays'])) {
setArg(fullKey, value)
}
}
})
}
// set all config objects passed in opts
function setConfigObjects () {
if (typeof configObjects === 'undefined') return
configObjects.forEach(function (configObject) {
setConfigObject(configObject)
})
}
function applyEnvVars (argv, configOnly) {
if (typeof envPrefix === 'undefined') return
var prefix = typeof envPrefix === 'string' ? envPrefix : ''
Object.keys(process.env).forEach(function (envVar) {
if (prefix === '' || envVar.lastIndexOf(prefix, 0) === 0) {
// get array of nested keys and convert them to camel case
var keys = envVar.split('__').map(function (key, i) {
if (i === 0) {
key = key.substring(prefix.length)
}
return camelCase(key)
})
if (((configOnly && flags.configs[keys.join('.')]) || !configOnly) && !hasKey(argv, keys)) {
setArg(keys.join('.'), process.env[envVar])
}
}
})
}
function applyCoercions (argv) {
var coerce
var applied = {}
Object.keys(argv).forEach(function (key) {
if (!applied.hasOwnProperty(key)) { // If we haven't already coerced this option via one of its aliases
coerce = checkAllAliases(key, flags.coercions)
if (typeof coerce === 'function') {
try {
var value = maybeCoerceNumber(key, coerce(argv[key]))
;([].concat(flags.aliases[key] || [], key)).forEach(ali => {
applied[ali] = argv[ali] = value
})
} catch (err) {
error = err
}
}
}
})
}
function setPlaceholderKeys (argv) {
flags.keys.forEach((key) => {
// don't set placeholder keys for dot notation options 'foo.bar'.
if (~key.indexOf('.')) return
if (typeof argv[key] === 'undefined') argv[key] = undefined
})
return argv
}
function applyDefaultsAndAliases (obj, aliases, defaults) {
Object.keys(defaults).forEach(function (key) {
if (!hasKey(obj, key.split('.'))) {
setKey(obj, key.split('.'), defaults[key])
;(aliases[key] || []).forEach(function (x) {
if (hasKey(obj, x.split('.'))) return
setKey(obj, x.split('.'), defaults[key])
})
}
})
}
function hasKey (obj, keys) {
var o = obj
if (!configuration['dot-notation']) keys = [keys.join('.')]
keys.slice(0, -1).forEach(function (key) {
o = (o[key] || {})
})
var key = keys[keys.length - 1]
if (typeof o !== 'object') return false
else return key in o
}
function setKey (obj, keys, value) {
var o = obj
if (!configuration['dot-notation']) keys = [keys.join('.')]
keys.slice(0, -1).forEach(function (key, index) {
// TODO(bcoe): in the next major version of yargs, switch to
// Object.create(null) for dot notation:
key = sanitizeKey(key)
if (typeof o === 'object' && o[key] === undefined) {
o[key] = {}
}
if (typeof o[key] !== 'object' || Array.isArray(o[key])) {
// ensure that o[key] is an array, and that the last item is an empty object.
if (Array.isArray(o[key])) {
o[key].push({})
} else {
o[key] = [o[key], {}]
}
// we want to update the empty object at the end of the o[key] array, so set o to that object
o = o[key][o[key].length - 1]
} else {
o = o[key]
}
})
// TODO(bcoe): in the next major version of yargs, switch to
// Object.create(null) for dot notation:
const key = sanitizeKey(keys[keys.length - 1])
const isTypeArray = checkAllAliases(keys.join('.'), flags.arrays)
const isValueArray = Array.isArray(value)
let duplicate = configuration['duplicate-arguments-array']
// nargs has higher priority than duplicate
if (!duplicate && checkAllAliases(key, flags.nargs)) {
duplicate = true
if ((!isUndefined(o[key]) && flags.nargs[key] === 1) || (Array.isArray(o[key]) && o[key].length === flags.nargs[key])) {
o[key] = undefined
}
}
if (value === increment) {
o[key] = increment(o[key])
} else if (Array.isArray(o[key])) {
if (duplicate && isTypeArray && isValueArray) {
o[key] = configuration['flatten-duplicate-arrays'] ? o[key].concat(value) : (Array.isArray(o[key][0]) ? o[key] : [o[key]]).concat([value])
} else if (!duplicate && Boolean(isTypeArray) === Boolean(isValueArray)) {
o[key] = value
} else {
o[key] = o[key].concat([value])
}
} else if (o[key] === undefined && isTypeArray) {
o[key] = isValueArray ? value : [value]
} else if (duplicate && !(o[key] === undefined || checkAllAliases(key, flags.counts))) {
o[key] = [ o[key], value ]
} else {
o[key] = value
}
}
// extend the aliases list with inferred aliases.
function extendAliases (...args) {
args.forEach(function (obj) {
Object.keys(obj || {}).forEach(function (key) {
// short-circuit if we've already added a key
// to the aliases array, for example it might
// exist in both 'opts.default' and 'opts.key'.
if (flags.aliases[key]) return
flags.aliases[key] = [].concat(aliases[key] || [])
// For "--option-name", also set argv.optionName
flags.aliases[key].concat(key).forEach(function (x) {
if (/-/.test(x) && configuration['camel-case-expansion']) {
var c = camelCase(x)
if (c !== key && flags.aliases[key].indexOf(c) === -1) {
flags.aliases[key].push(c)
newAliases[c] = true
}
}
})
// For "--optionName", also set argv['option-name']
flags.aliases[key].concat(key).forEach(function (x) {
if (x.length > 1 && /[A-Z]/.test(x) && configuration['camel-case-expansion']) {
var c = decamelize(x, '-')
if (c !== key && flags.aliases[key].indexOf(c) === -1) {
flags.aliases[key].push(c)
newAliases[c] = true
}
}
})
flags.aliases[key].forEach(function (x) {
flags.aliases[x] = [key].concat(flags.aliases[key].filter(function (y) {
return x !== y
}))
})
})
})
}
// check if a flag is set for any of a key's aliases.
function checkAllAliases (key, flag) {
var isSet = false
var toCheck = [].concat(flags.aliases[key] || [], key)
toCheck.forEach(function (key) {
if (flag.hasOwnProperty(key)) isSet = flag[key]
})
return isSet
}
function hasAnyFlag (key) {
// XXX Switch to [].concat(...Object.values(flags)) once node.js 6 is dropped
var toCheck = [].concat(...Object.keys(flags).map(k => flags[k]))
return toCheck.some(function (flag) {
return flag[key]
})
}
function hasFlagsMatching (arg, ...patterns) {
var toCheck = [].concat(...patterns)
return toCheck.some(function (pattern) {
var match = arg.match(pattern)
return match && hasAnyFlag(match[1])
})
}
// based on a simplified version of the short flag group parsing logic
function hasAllShortFlags (arg) {
// if this is a negative number, or doesn't start with a single hyphen, it's not a short flag group
if (arg.match(negative) || !arg.match(/^-[^-]+/)) { return false }
var hasAllFlags = true
var letters = arg.slice(1).split('')
var next
for (var j = 0; j < letters.length; j++) {
next = arg.slice(j + 2)
if (!hasAnyFlag(letters[j])) {
hasAllFlags = false
break
}
if ((letters[j + 1] && letters[j + 1] === '=') ||
next === '-' ||
(/[A-Za-z]/.test(letters[j]) && /^-?\d+(\.\d*)?(e-?\d+)?$/.test(next)) ||
(letters[j + 1] && letters[j + 1].match(/\W/))) {
break
}
}
return hasAllFlags
}
function isUnknownOptionAsArg (arg) {
return configuration['unknown-options-as-args'] && isUnknownOption(arg)
}
function isUnknownOption (arg) {
// ignore negative numbers
if (arg.match(negative)) { return false }
// if this is a short option group and all of them are configured, it isn't unknown
if (hasAllShortFlags(arg)) { return false }
// e.g. '--count=2'
const flagWithEquals = /^-+([^=]+?)=[\s\S]*$/
// e.g. '-a' or '--arg'
const normalFlag = /^-+([^=]+?)$/
// e.g. '-a-'
const flagEndingInHyphen = /^-+([^=]+?)-$/
// e.g. '-abc123'
const flagEndingInDigits = /^-+([^=]+?)\d+$/
// e.g. '-a/usr/local'
const flagEndingInNonWordCharacters = /^-+([^=]+?)\W+.*$/
// check the different types of flag styles, including negatedBoolean, a pattern defined near the start of the parse method
return !hasFlagsMatching(arg, flagWithEquals, negatedBoolean, normalFlag, flagEndingInHyphen, flagEndingInDigits, flagEndingInNonWordCharacters)
}
// make a best effor to pick a default value
// for an option based on name and type.
function defaultValue (key) {
if (!checkAllAliases(key, flags.bools) &&
!checkAllAliases(key, flags.counts) &&
`${key}` in defaults) {
return defaults[key]
} else {
return defaultForType(guessType(key))
}
}
// return a default value, given the type of a flag.,
// e.g., key of type 'string' will default to '', rather than 'true'.
function defaultForType (type) {
var def = {
boolean: true,
string: '',
number: undefined,
array: []
}
return def[type]
}
// given a flag, enforce a default type.
function guessType (key) {
var type = 'boolean'
if (checkAllAliases(key, flags.strings)) type = 'string'
else if (checkAllAliases(key, flags.numbers)) type = 'number'
else if (checkAllAliases(key, flags.bools)) type = 'boolean'
else if (checkAllAliases(key, flags.arrays)) type = 'array'
return type
}
function isNumber (x) {
if (x === null || x === undefined) return false
// if loaded from config, may already be a number.
if (typeof x === 'number') return true
// hexadecimal.
if (/^0x[0-9a-f]+$/i.test(x)) return true
// don't treat 0123 as a number; as it drops the leading '0'.
if (x.length > 1 && x[0] === '0') return false
return /^[-]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/.test(x)
}
function isUndefined (num) {
return num === undefined
}
return {
argv: argv,
error: error,
aliases: flags.aliases,
newAliases: newAliases,
configuration: configuration
}
}
// if any aliases reference each other, we should
// merge them together.
function combineAliases (aliases) {
var aliasArrays = []
var change = true
var combined = {}
// turn alias lookup hash {key: ['alias1', 'alias2']} into
// a simple array ['key', 'alias1', 'alias2']
Object.keys(aliases).forEach(function (key) {
aliasArrays.push(
[].concat(aliases[key], key)
)
})
// combine arrays until zero changes are
// made in an iteration.
while (change) {
change = false
for (var i = 0; i < aliasArrays.length; i++) {
for (var ii = i + 1; ii < aliasArrays.length; ii++) {
var intersect = aliasArrays[i].filter(function (v) {
return aliasArrays[ii].indexOf(v) !== -1
})
if (intersect.length) {
aliasArrays[i] = aliasArrays[i].concat(aliasArrays[ii])
aliasArrays.splice(ii, 1)
change = true
break
}
}
}
}
// map arrays back to the hash-lookup (de-dupe while
// we're at it).
aliasArrays.forEach(function (aliasArray) {
aliasArray = aliasArray.filter(function (v, i, self) {
return self.indexOf(v) === i
})
combined[aliasArray.pop()] = aliasArray
})
return combined
}
// this function should only be called when a count is given as an arg
// it is NOT called to set a default value
// thus we can start the count at 1 instead of 0
function increment (orig) {
return orig !== undefined ? orig + 1 : 1
}
function Parser (args, opts) {
var result = parse(args.slice(), opts)
return result.argv
}
// parse arguments and return detailed
// meta information, aliases, etc.
Parser.detailed = function (args, opts) {
return parse(args.slice(), opts)
}
// TODO(bcoe): in the next major version of yargs, switch to
// Object.create(null) for dot notation:
function sanitizeKey (key) {
if (key === '__proto__') return '___proto___'
return key
}
module.exports = Parser
Zerion Mini Shell 1.0