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Edit File : index.js \| Size : 29.42 KB
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 Back

Edit File : index.js | Size : 29.42 KB

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

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