/**
* @name utils
* @memberof module:js-data
* @type {Object}
* @property {Function} addHiddenPropsToTarget TODO
* @property {Function} classCallCheck TODO
* @property {Function} copy TODO
* @property {Function} deepMixIn TODO
* @property {Function} eventify TODO
* @property {Function} extend TODO
* @property {Function} fillIn TODO
* @property {Function} fromJson TODO
* @property {Function} get TODO
* @property {Function} getSuper TODO
* @property {Function} intersection TODO
* @property {Function} isArray TODO
* @property {Function} isBlacklisted TODO
* @property {boolean} isBrowser TODO
* @property {Function} isBoolean TODO
* @property {Function} isFunction TODO
* @property {Function} isInteger TODO
* @property {Function} isNull TODO
* @property {Function} isNumber TODO
* @property {Function} isObject TODO
* @property {Function} isRegExp TODO
* @property {Function} isSorN TODO
* @property {Function} isString TODO
* @property {Function} isUndefined TODO
* @property {Function} possibleConstructorReturn TODO
* @property {Function} reject TODO
* @property {Function} resolve TODO
* @property {Function} set TODO
* @property {Function} toJson TODO
* @property {Function} uuid TODO
*/
const INFINITY = 1 / 0
const MAX_INTEGER = 1.7976931348623157e+308
const BOOL_TAG = '[object Boolean]'
const DATE_TAG = '[object Date]'
const FUNC_TAG = '[object Function]'
const NUMBER_TAG = '[object Number]'
const OBJECT_TAG = '[object Object]'
const REGEXP_TAG = '[object RegExp]'
const STRING_TAG = '[object String]'
const objToString = Object.prototype.toString
let isBrowser
// Attempt to detect whether we are in the browser.
try {
isBrowser = !!window
} catch (e) {
isBrowser = false
}
export {isBrowser}
const toString = function (value) {
return objToString.call(value)
}
const toInteger = function (value) {
if (!value) {
return value === 0 ? value : 0
}
value = +value
if (value === INFINITY || value === -INFINITY) {
const sign = (value < 0 ? -1 : 1)
return sign * MAX_INTEGER
}
const remainder = value % 1
return value === value ? (remainder ? value - remainder : value) : 0 // eslint-disable-line
}
const isPlainObject = function (value) {
return (!!value && typeof value === 'object' && value.constructor === Object)
}
export const isArray = Array.isArray
export const isDate = function (value) {
return (value && typeof value === 'object' && toString(value) === DATE_TAG)
}
export const isFunction = function (value) {
return typeof value === 'function' || (value && toString(value) === FUNC_TAG)
}
export const isInteger = function (value) {
return toString(value) === NUMBER_TAG && value == toInteger(value) // eslint-disable-line
}
export const isNull = function (value) {
return value === null
}
export const isNumber = function (value) {
const type = typeof value
return type === 'number' || (value && type === 'object' && toString(value) === NUMBER_TAG)
}
export const isObject = function (value) {
return toString(value) === OBJECT_TAG
}
export const isRegExp = function (value) {
return toString(value) === REGEXP_TAG
}
export const isSorN = function (value) {
return isString(value) || isNumber(value)
}
export const isString = function (value) {
return typeof value === 'string' || (value && typeof value === 'object' && toString(value) === STRING_TAG)
}
export const isUndefined = function (value) {
return value === undefined
}
export const isBoolean = function (value) {
return toString(value) === BOOL_TAG
}
export const get = function (object, prop) {
if (!prop) {
return
}
const parts = prop.split('.')
const last = parts.pop()
while (prop = parts.shift()) { // eslint-disable-line
object = object[prop]
if (object == null) return
}
return object[last]
}
const mkdirP = function (object, path) {
if (!path) {
return object
}
const parts = path.split('.')
parts.forEach(function (key) {
if (!object[key]) {
object[key] = {}
}
object = object[key]
})
return object
}
const PATH = /^(.+)\.(.+)$/
/**
* Set the value at the provided key or path.
*
* @ignore
* @param {Object} object The object on which to set a property.
* @param {(string|Object)} path The key or path to the property. Can also
* pass in an object of path/value pairs, which will all be set on the target
* object.
* @param {*} [value] The value to set.
*/
export const set = function (object, path, value) {
if (isObject(path)) {
forOwn(path, function (value, _path) {
set(object, _path, value)
})
} else {
const parts = PATH.exec(path)
if (parts) {
mkdirP(object, parts[1])[parts[2]] = value
} else {
object[path] = value
}
}
}
/**
* Iterate over an object's own enumerable properties.
*
* @ignore
* @param {Object} object The object whose properties are to be enumerated.
* @param {Function} fn Iteration function.
* @param {Object} [thisArg] Content to which to bind `fn`.
*/
export const forOwn = function (obj, fn, thisArg) {
const keys = Object.keys(obj)
const len = keys.length
let i
for (i = 0; i < len; i++) {
fn.call(thisArg, obj[keys[i]], keys[i], obj)
}
}
/**
* Recursively shallow copy own enumberable properties from `source` to `dest`.
*
* @ignore
* @param {Object} dest The destination object.
* @param {Object} source The source object.
*/
export const deepMixIn = function (dest, source) {
if (source) {
forOwn(source, function (value, key) {
const existing = this[key]
if (isPlainObject(value) && isPlainObject(existing)) {
deepMixIn(existing, value)
} else {
this[key] = value
}
}, dest)
}
return dest
}
/**
* Proxy for `Promise.resolve`.
*
* @ignore
* @param {*} [value] Value with which to resolve the Promise.
* @return {Promise} Promise resolved with `value`.
*/
export const resolve = function (value) {
return Promise.resolve(value)
}
/**
* Proxy for `Promise.reject`.
*
* @ignore
* @param {*} [value] Value with which to reject the Promise.
* @return {Promise} Promise reject with `value`.
*/
export const reject = function (value) {
return Promise.reject(value)
}
/**
* Shallow copy properties from src to dest that meet the following criteria:
* - own enumerable
* - not a function
* - does not start with "_"
*
* @ignore
* @param {Object} dest Destination object.
* @param {Object} src Source object.
*/
export const _ = function (dest, src) {
for (var key in dest) {
let value = dest[key]
if (src[key] === undefined && !isFunction(value) && key && key.indexOf('_') !== 0) {
src[key] = value
}
}
}
/**
* Return the intersection of two arrays.
*
* @ignore
* @param {Array} array1 First array.
* @param {Array} array2 Second array.
* @return {Array} Array of elements common to both arrays.
*/
export const intersection = function (array1, array2) {
if (!array1 || !array2) {
return []
}
const result = []
let item
let i
const len = array1.length
for (i = 0; i < len; i++) {
item = array1[i]
if (result.indexOf(item) !== -1) {
continue
}
if (array2.indexOf(item) !== -1) {
result.push(item)
}
}
return result
}
/**
* Shallow copy own enumerable properties from `src` to `dest` that are on `src`
* but are missing from `dest.
*
* @ignore
* @param {Object} dest The destination object.
* @param {Object} source The source object.
*/
export const fillIn = function (dest, src) {
forOwn(src, function (value, key) {
if (!dest.hasOwnProperty(key) || dest[key] === undefined) {
dest[key] = value
}
})
}
/**
* Return whether `prop` is matched by any string or regular expression in `bl`.
*
* @ignore
* @param {string} prop The name of a property.
* @param {Array} bl Array of strings and regular expressions.
* @return {boolean} Whether `prop` was matched.
*/
export const isBlacklisted = function (prop, bl) {
if (!bl || !bl.length) {
return false
}
let matches
for (var i = 0; i < bl.length; i++) {
if ((toString(bl[i]) === '[object RegExp]' && bl[i].test(prop)) || bl[i] === prop) {
matches = prop
return matches
}
}
return !!matches
}
/**
* Proxy for `JSON.parse`.
*
* @ignore
* @param {string} json JSON to parse.
* @return {Object} Parsed object.
*/
export const fromJson = function (json) {
return isString(json) ? JSON.parse(json) : json
}
/**
* Proxy for `JSON.stringify`.
*
* @ignore
* @param {*} value Value to serialize to JSON.
* @return {string} JSON string.
*/
export const toJson = JSON.stringify
/**
* Deep copy a value.
*
* @ignore
* @param {*} from Value to deep copy.
* @return {*} Deep copy of `from`.
*/
export const copy = function (from, to, stackFrom, stackTo, blacklist) {
if (!to) {
to = from
if (from) {
if (isArray(from)) {
to = copy(from, [], stackFrom, stackTo, blacklist)
} else if (isDate(from)) {
to = new Date(from.getTime())
} else if (isRegExp(from)) {
to = new RegExp(from.source, from.toString().match(/[^\/]*$/)[0])
to.lastIndex = from.lastIndex
} else if (isObject(from)) {
to = copy(from, Object.create(Object.getPrototypeOf(from)), stackFrom, stackTo, blacklist)
}
}
} else {
if (from === to) {
throw new Error('Cannot copy! Source and destination are identical.')
}
stackFrom = stackFrom || []
stackTo = stackTo || []
if (isObject(from)) {
let index = stackFrom.indexOf(from)
if (index !== -1) {
return stackTo[index]
}
stackFrom.push(from)
stackTo.push(to)
}
let result
if (isArray(from)) {
let i
to.length = 0
for (i = 0; i < from.length; i++) {
result = copy(from[i], null, stackFrom, stackTo, blacklist)
if (isObject(from[i])) {
stackFrom.push(from[i])
stackTo.push(result)
}
to.push(result)
}
} else {
if (isArray(to)) {
to.length = 0
} else {
forOwn(to, function (value, key) {
delete to[key]
})
}
for (var key in from) {
if (from.hasOwnProperty(key)) {
if (isBlacklisted(key, blacklist)) {
continue
}
result = copy(from[key], null, stackFrom, stackTo, blacklist)
if (isObject(from[key])) {
stackFrom.push(from[key])
stackTo.push(result)
}
to[key] = result
}
}
}
}
return to
}
/**
* Add eventing capabilities into the target object.
*
* @ignore
* @param {Object} target Target object.
* @param {Function} [getter] Custom getter for retrieving the object's event
* listeners.
* @param {Function} [setter] Custom setter for setting the object's event
* listeners.
*/
export const eventify = function (target, getter, setter, enumerable) {
target = target || this
let _events = {}
if (!getter && !setter) {
getter = function () {
return _events
}
setter = function (value) {
_events = value
}
}
Object.defineProperties(target, {
on: {
enumerable: !!enumerable,
value (type, func, ctx) {
if (!getter.call(this)) {
setter.call(this, {})
}
const events = getter.call(this)
events[type] = events[type] || []
events[type].push({
f: func,
c: ctx
})
}
},
off: {
enumerable: !!enumerable,
value (type, func) {
const events = getter.call(this)
const listeners = events[type]
if (!listeners) {
setter.call(this, {})
} else if (func) {
for (let i = 0; i < listeners.length; i++) {
if (listeners[i].f === func) {
listeners.splice(i, 1)
break
}
}
} else {
listeners.splice(0, listeners.length)
}
}
},
emit: {
enumerable: !!enumerable,
value (...args) {
const events = getter.call(this) || {}
const type = args.shift()
let listeners = events[type] || []
let i
for (i = 0; i < listeners.length; i++) {
listeners[i].f.apply(listeners[i].c, args)
}
listeners = events.all || []
args.unshift(type)
for (i = 0; i < listeners.length; i++) {
listeners[i].f.apply(listeners[i].c, args)
}
}
}
})
}
export const classCallCheck = function (instance, Constructor) {
if (!(instance instanceof Constructor)) {
throw new TypeError('Cannot call a class as a function')
}
}
export const possibleConstructorReturn = function (self, call) {
if (!self) {
throw new ReferenceError('this hasn\'t been initialised - super() hasn\'t been called')
}
return call && (typeof call === 'object' || typeof call === 'function') ? call : self
}
export const addHiddenPropsToTarget = function (target, props) {
forOwn(props, function (value, key) {
props[key] = {
writable: true,
value
}
})
Object.defineProperties(target, props)
}
export const extend = function (props, classProps) {
const SuperClass = this
let SubClass
props || (props = {})
classProps || (classProps = {})
if (props.hasOwnProperty('constructor')) {
SubClass = props.constructor
delete props.constructor
} else {
SubClass = function (...args) {
classCallCheck(this, SubClass)
const _this = possibleConstructorReturn(this, (SubClass.__super__ || Object.getPrototypeOf(SubClass)).apply(this, args))
return _this
}
}
SubClass.prototype = Object.create(SuperClass && SuperClass.prototype, {
constructor: {
value: SubClass,
enumerable: false,
writable: true,
configurable: true
}
})
if (Object.setPrototypeOf) {
Object.setPrototypeOf(SubClass, SuperClass)
} else if (classProps.strictEs6Class) {
SubClass.__proto__ = SuperClass // eslint-disable-line
} else {
forOwn(SuperClass, function (value, key) {
SubClass[key] = value
})
}
Object.defineProperty(SubClass, '__super__', {
configurable: true,
value: SuperClass
})
addHiddenPropsToTarget(SubClass.prototype, props)
fillIn(SubClass, classProps)
return SubClass
}
export const getSuper = function (instance) {
const Ctor = instance.constructor
return (Ctor.__super__ || Object.getPrototypeOf(Ctor) || Ctor.__proto__) // eslint-disable-line
}