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| var camelCase = require('camelcase')
var path = require('path')
var tokenizeArgString = require('./lib/tokenize-arg-string')
var util = require('util')
function parse (args, opts) {
Iif (!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 = assign({
'short-option-groups': true,
'camel-case-expansion': true,
'dot-notation': true,
'parse-numbers': true,
'boolean-negation': true,
'duplicate-arguments-array': true,
'flatten-duplicate-arrays': true
}, opts.configuration)
var defaults = opts.default || {}
var configObjects = opts.configObjects || []
var envPrefix = opts.envPrefix
var newAliases = {}
// allow a i18n handler to be passed in, default to a fake one (util.format).
var __ = opts.__ || function (str) {
return util.format.apply(util, Array.prototype.slice.call(arguments))
}
var error = null
var flags = {
aliases: {},
arrays: {},
bools: {},
strings: {},
numbers: {},
counts: {},
normalize: {},
configs: {},
defaulted: {},
nargs: {},
coercions: {}
}
var negative = /^-[0-9]+(\.[0-9]+)?/
;[].concat(opts.array).filter(Boolean).forEach(function (key) {
flags.arrays[key] = true
})
;[].concat(opts.boolean).filter(Boolean).forEach(function (key) {
flags.bools[key] = true
})
;[].concat(opts.string).filter(Boolean).forEach(function (key) {
flags.strings[key] = true
})
;[].concat(opts.number).filter(Boolean).forEach(function (key) {
flags.numbers[key] = true
})
;[].concat(opts.count).filter(Boolean).forEach(function (key) {
flags.counts[key] = true
})
;[].concat(opts.normalize).filter(Boolean).forEach(function (key) {
flags.normalize[key] = true
})
Object.keys(opts.narg || {}).forEach(function (k) {
flags.nargs[k] = opts.narg[k]
})
Object.keys(opts.coerce || {}).forEach(function (k) {
flags.coercions[k] = opts.coerce[k]
})
Iif (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 = { _: [] }
Object.keys(flags.bools).forEach(function (key) {
setArg(key, !(key in defaults) ? false : defaults[key])
setDefaulted(key)
})
var notFlags = []
Iif (args.indexOf('--') !== -1) {
notFlags = args.slice(args.indexOf('--') + 1)
args = args.slice(0, args.indexOf('--'))
}
for (var i = 0; i < args.length; i++) {
var arg = args[i]
var broken
var key
var letters
var m
var next
var value
// -- seperated by =
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]*)$/)
// nargs format = '--f=monkey washing cat'
if (checkAllAliases(m[1], flags.nargs)) {
args.splice(i + 1, 0, m[2])
i = eatNargs(i, m[1], args)
// arrays format = '--f=a b c'
} else if (checkAllAliases(m[1], flags.arrays) && args.length > i + 1) {
args.splice(i + 1, 0, m[2])
i = eatArray(i, m[1], args)
} else {
setArg(m[1], m[2])
}
} else if (arg.match(/^--no-.+/) && configuration['boolean-negation']) {
key = arg.match(/^--no-(.+)/)[1]
setArg(key, false)
// -- seperated by space.
} else if (arg.match(/^--.+/) || (
!configuration['short-option-groups'] && arg.match(/^-.+/)
)) {
key = arg.match(/^--?(.+)/)[1]
// nargs format = '--foo a b c'
if (checkAllAliases(key, flags.nargs)) {
i = eatNargs(i, key, args)
// array format = '--foo a b c'
} else if (checkAllAliases(key, flags.arrays) && args.length > i + 1) {
i = eatArray(i, key, args)
} else {
next = args[i + 1]
if (next !== undefined && (!next.match(/^-/) ||
next.match(negative)) &&
!checkAllAliases(key, flags.bools) &&
!checkAllAliases(key, flags.counts)) {
setArg(key, next)
i++
} else if (/^(true|false)$/.test(next)) {
setArg(key, next)
i++
} else {
setArg(key, defaultForType(guessType(key, flags)))
}
}
// dot-notation flag seperated by '='.
} else if (arg.match(/^-.\..+=/)) {
m = arg.match(/^-([^=]+)=([\s\S]*)$/)
setArg(m[1], m[2])
// dot-notation flag seperated by space.
} else if (arg.match(/^-.\..+/)) {
next = args[i + 1]
key = arg.match(/^-(.\..+)/)[1]
if (next !== undefined && !next.match(/^-/) &&
!checkAllAliases(key, flags.bools) &&
!checkAllAliases(key, flags.counts)) {
setArg(key, next)
i++
} else {
setArg(key, defaultForType(guessType(key, flags)))
}
} else if (arg.match(/^-[^-]+/) && !arg.match(negative)) {
letters = arg.slice(1, -1).split('')
broken = false
for (var j = 0; j < letters.length; j++) {
next = arg.slice(j + 2)
if (letters[j + 1] && letters[j + 1] === '=') {
value = arg.slice(j + 3)
key = letters[j]
// nargs format = '-f=monkey washing cat'
if (checkAllAliases(key, flags.nargs)) {
args.splice(i + 1, 0, value)
i = eatNargs(i, key, args)
// array format = '-f=a b c'
} else if (checkAllAliases(key, flags.arrays) && args.length > i + 1) {
args.splice(i + 1, 0, value)
i = eatArray(i, key, args)
} else {
setArg(key, value)
}
broken = true
break
}
if (next === '-') {
setArg(letters[j], next)
continue
}
// current letter is an alphabetic character and next value is a number
if (/[A-Za-z]/.test(letters[j]) &&
/^-?\d+(\.\d*)?(e-?\d+)?$/.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], defaultForType(guessType(letters[j], flags)))
}
}
key = arg.slice(-1)[0]
if (!broken && key !== '-') {
// nargs format = '-f a b c'
if (checkAllAliases(key, flags.nargs)) {
i = eatNargs(i, key, args)
// array format = '-f a b c'
} else if (checkAllAliases(key, flags.arrays) && args.length > i + 1) {
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, defaultForType(guessType(key, flags)))
}
}
}
} else {
argv._.push(
flags.strings['_'] || !isNumber(arg) ? arg : Number(arg)
)
}
}
// order of precedence:
// 1. command line arg
// 2. value from config file
// 3. value from config objects
// 4. value from env var
// 5. configured default value
applyEnvVars(argv, true) // special case: check env vars that point to config file
setConfig(argv)
setConfigObjects()
applyEnvVars(argv, false)
applyDefaultsAndAliases(argv, flags.aliases, defaults)
applyCoercions(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)
})
notFlags.forEach(function (key) {
argv._.push(key)
})
// how many arguments should we consume, based
// on the nargs option?
function eatNargs (i, key, args) {
var toEat = checkAllAliases(key, flags.nargs)
if (args.length - (i + 1) < toEat) error = Error(__('Not enough arguments following: %s', key))
for (var ii = i + 1; ii < (toEat + i + 1); ii++) {
setArg(key, args[ii])
}
return (i + toEat)
}
// 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) {
var start = i + 1
var argsToSet = []
var multipleArrayFlag = i > 0
for (var ii = i + 1; ii < args.length; ii++) {
if (/^-/.test(args[ii]) && !negative.test(args[ii])) {
if (ii === start) {
setArg(key, defaultForType('array'))
}
multipleArrayFlag = true
break
}
i = ii
argsToSet.push(args[ii])
}
if (multipleArrayFlag) {
setArg(key, argsToSet.map(function (arg) {
return processValue(key, arg)
}))
} else {
argsToSet.forEach(function (arg) {
setArg(key, arg)
})
}
return i
}
function setArg (key, val) {
unsetDefaulted(key)
if (/-/.test(key) && !(flags.aliases[key] && flags.aliases[key].length) && configuration['camel-case-expansion']) {
var c = camelCase(key)
flags.aliases[key] = [c]
newAliases[c] = true
}
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(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 processValue (key, val) {
// 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 = val
if (!checkAllAliases(key, flags.strings) && !checkAllAliases(key, flags.coercions)) {
if (isNumber(val)) value = Number(val)
if (!isUndefined(val) && !isNumber(val) && checkAllAliases(key, flags.numbers)) value = NaN
}
// 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
}
// 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' && !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('.')) || (flags.defaulted[fullKey])) {
setArg(fullKey, value)
}
}
})
}
// set all config objects passed in opts
function setConfigObjects () {
Iif (typeof configObjects === 'undefined') return
configObjects.forEach(function (configObject) {
setConfigObject(configObject)
})
}
function applyEnvVars (argv, configOnly) {
Eif (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) || flags.defaulted[keys.join('.')])) {
setArg(keys.join('.'), process.env[envVar])
}
}
})
}
function applyCoercions (argv) {
var coerce
Object.keys(argv).forEach(function (key) {
coerce = checkAllAliases(key, flags.coercions)
Iif (typeof coerce === 'function') {
try {
argv[key] = coerce(argv[key])
} catch (err) {
error = err
}
}
})
}
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) {
if (o[key] === undefined) o[key] = {}
o = o[key]
})
var key = keys[keys.length - 1]
var isTypeArray = checkAllAliases(key, flags.arrays)
var isValueArray = Array.isArray(value)
var duplicate = configuration['duplicate-arguments-array']
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) : [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.bools) || checkAllAliases(keys.join('.'), flags.bools) || checkAllAliases(key, flags.counts))) {
o[key] = [ o[key], value ]
} else {
o[key] = value
}
}
// extend the aliases list with inferred aliases.
function extendAliases () {
Array.prototype.slice.call(arguments).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)
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) {
Iif (flag[key]) isSet = flag[key]
})
return isSet
}
function setDefaulted (key) {
[].concat(flags.aliases[key] || [], key).forEach(function (k) {
flags.defaulted[k] = true
})
}
function unsetDefaulted (key) {
[].concat(flags.aliases[key] || [], key).forEach(function (k) {
delete flags.defaulted[k]
})
}
// 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, flags) {
var type = 'boolean'
if (checkAllAliases(key, flags.strings)) type = 'string'
else if (checkAllAliases(key, flags.numbers)) type = 'number'
else if (checkAllAliases(key, flags.arrays)) type = 'array'
return type
}
function isNumber (x) {
if (!configuration['parse-numbers']) return false
if (typeof x === 'number') return true
if (/^0x[0-9a-f]+$/i.test(x)) return true
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
}
function assign (defaults, configuration) {
var o = {}
configuration = configuration || {}
Object.keys(defaults).forEach(function (k) {
o[k] = defaults[k]
})
Object.keys(configuration).forEach(function (k) {
o[k] = configuration[k]
})
return o
}
// 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)
}
module.exports = Parser
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