/**
* Utility methods used by JSData.
*
* @example
* import {utils} from 'js-data'
* console.log(utils.isString('foo')) // true
*
* @namespace utils
* @type {Object}
*/
const DOMAIN = 'utils'
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
const PATH = /^(.+)\.(.+)$/
const ERRORS = {
'400' () { return `expected: ${arguments[0]}, found: ${arguments[2] ? arguments[1] : typeof arguments[1]}` },
'404' () { return `${arguments[0]} not found` }
}
const toInteger = function (value) {
if (!value) {
return 0
}
// Coerce to number
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 toStr = function (value) {
return objToString.call(value)
}
const isPlainObject = function (value) {
return (!!value && typeof value === 'object' && value.constructor === Object)
}
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 utils = {
/**
* Reference to the Promise constructor used by JSData. Defaults to
* `window.Promise` or `global.Promise`.
*
* @example <caption>Make JSData use a different `Promise` constructor</caption>
* import Promise from 'bluebird'
* import {utils} from 'js-data'
* utils.Promise = Promise
*
* @name utils.Promise
* @since 3.0.0
* @type {Function}
*/
Promise: Promise,
/**
* Shallow copy properties that meet the following criteria from `src` to
* `dest`:
*
* - own enumerable
* - not a function
* - does not start with "_"
*
* @name utils._
* @param {Object} dest Destination object.
* @param {Object} src Source object.
* @private
* @since 3.0.0
*/
_ (dest, src) {
utils.forOwn(src, function (value, key) {
if (key && utils.isUndefined(dest[key]) && !utils.isFunction(value) && key.indexOf('_') !== 0) {
dest[key] = value
}
})
},
/**
* TODO
*
* @name utils._forRelation
* @private
*/
_forRelation (opts, def, fn, ctx) {
const relationName = def.relation
let containedName = null
let index
opts || (opts = {})
opts.with || (opts.with = [])
if ((index = utils._getIndex(opts.with, relationName)) >= 0) {
containedName = relationName
} else if ((index = utils._getIndex(opts.with, def.localField)) >= 0) {
containedName = def.localField
}
if (opts.withAll) {
fn.call(ctx, def, {})
return
} else if (!containedName) {
return
}
let optsCopy = {}
utils.fillIn(optsCopy, def.getRelation())
utils.fillIn(optsCopy, opts)
optsCopy.with = opts.with.slice()
optsCopy._activeWith = optsCopy.with.splice(index, 1)[0]
optsCopy.with.forEach(function (relation, i) {
if (relation && relation.indexOf(containedName) === 0 && relation.length >= containedName.length && relation[containedName.length] === '.') {
optsCopy.with[i] = relation.substr(containedName.length + 1)
} else {
optsCopy.with[i] = ''
}
})
fn.call(ctx, def, optsCopy)
},
/**
* TODO
*
* @name utils._getIndex
* @private
*/
_getIndex (list, relation) {
let index = -1
list.forEach(function (_relation, i) {
if (_relation === relation) {
index = i
return false
} else if (utils.isObject(_relation)) {
if (_relation.relation === relation) {
index = i
return false
}
}
})
return index
},
/**
* Define hidden (non-enumerable), writable properties on `target` from the
* provided `props`.
*
* @name utils.addHiddenPropsToTarget
* @param {Object} target That to which `props` should be added.
* @param {Object} props Properties to be added to `target`.
*/
addHiddenPropsToTarget (target, props) {
const map = {}
utils.forOwn(props, function (value, key) {
map[key] = {
writable: true,
value
}
})
Object.defineProperties(target, map)
},
/**
* TODO
*
* @ignore
*/
areDifferent (a, b, opts) {
opts || (opts = {})
const diff = utils.diffObjects(a, b, opts)
const diffCount = Object.keys(diff.added).length +
Object.keys(diff.removed).length +
Object.keys(diff.changed).length
return diffCount > 0
},
/**
* TODO
*
* @ignore
*/
classCallCheck (instance, ctor) {
if (!(instance instanceof ctor)) {
throw utils.err(`${ctor.name}`)(500, 'Cannot call a class as a function')
}
},
/**
* Deep copy a value.
*
* @ignore
* @param {*} from Value to deep copy.
* @returns {*} Deep copy of `from`.
*/
copy (from, to, stackFrom, stackTo, blacklist, plain) {
if (!to) {
to = from
if (from) {
if (utils.isArray(from)) {
to = utils.copy(from, [], stackFrom, stackTo, blacklist, plain)
} else if (utils.isDate(from)) {
to = new Date(from.getTime())
} else if (utils.isRegExp(from)) {
to = new RegExp(from.source, from.toString().match(/[^\/]*$/)[0])
to.lastIndex = from.lastIndex
} else if (utils.isObject(from)) {
if (plain) {
to = utils.copy(from, {}, stackFrom, stackTo, blacklist, plain)
} else {
to = utils.copy(from, Object.create(Object.getPrototypeOf(from)), stackFrom, stackTo, blacklist, plain)
}
}
}
} else {
if (from === to) {
throw utils.err(`${DOMAIN}.copy`)(500, 'Cannot copy! Source and destination are identical.')
}
stackFrom = stackFrom || []
stackTo = stackTo || []
if (utils.isObject(from)) {
let index = stackFrom.indexOf(from)
if (index !== -1) {
return stackTo[index]
}
stackFrom.push(from)
stackTo.push(to)
}
let result
if (utils.isArray(from)) {
let i
to.length = 0
for (i = 0; i < from.length; i++) {
result = utils.copy(from[i], null, stackFrom, stackTo, blacklist, plain)
if (utils.isObject(from[i])) {
stackFrom.push(from[i])
stackTo.push(result)
}
to.push(result)
}
} else {
if (utils.isArray(to)) {
to.length = 0
} else {
utils.forOwn(to, function (value, key) {
delete to[key]
})
}
for (var key in from) {
if (from.hasOwnProperty(key)) {
if (utils.isBlacklisted(key, blacklist)) {
continue
}
result = utils.copy(from[key], null, stackFrom, stackTo, blacklist, plain)
if (utils.isObject(from[key])) {
stackFrom.push(from[key])
stackTo.push(result)
}
to[key] = result
}
}
}
}
return to
},
/**
* Recursively shallow fill in own enumberable properties from `source` to `dest`.
*
* @ignore
* @param {Object} dest The destination object.
* @param {Object} source The source object.
*/
deepFillIn (dest, source) {
if (source) {
utils.forOwn(source, function (value, key) {
const existing = dest[key]
if (isPlainObject(value) && isPlainObject(existing)) {
utils.deepFillIn(existing, value)
} else if (!dest.hasOwnProperty(key) || dest[key] === undefined) {
dest[key] = value
}
})
}
return dest
},
/**
* Recursively shallow copy own enumberable properties from `source` to `dest`.
*
* @ignore
* @param {Object} dest The destination object.
* @param {Object} source The source object.
*/
deepMixIn (dest, source) {
if (source) {
utils.forOwn(source, function (value, key) {
const existing = dest[key]
if (isPlainObject(value) && isPlainObject(existing)) {
utils.deepMixIn(existing, value)
} else {
dest[key] = value
}
})
}
return dest
},
/**
* @param {Object} a Base object.
* @param {Object} b Comparison object.
* @returns {Object} Diff.
*/
diffObjects (a, b, opts) {
opts || (opts = {})
let equalsFn = opts.equalsFn
let bl = opts.ignore
const diff = {
added: {},
changed: {},
removed: {}
}
if (!utils.isFunction(equalsFn)) {
equalsFn = utils.strictEqual
}
utils.forOwn(b, function (oldValue, key) {
const newValue = a[key]
if (utils.isBlacklisted(key, bl) || equalsFn(newValue, oldValue)) {
return
}
if (utils.isUndefined(newValue)) {
diff.removed[key] = undefined
} else if (!equalsFn(newValue, oldValue)) {
diff.changed[key] = newValue
}
})
utils.forOwn(a, function (newValue, key) {
if (!utils.isUndefined(b[key]) || utils.isBlacklisted(key, bl)) {
return
}
diff.added[key] = newValue
})
return diff
},
/**
* TODO
*/
equal (a, b) {
return a == b // eslint-disable-line
},
/**
* TODO
*/
err (domain, target) {
return function (code) {
const prefix = `[${domain}:${target}] `
let message = ERRORS[code].apply(null, Array.prototype.slice.call(arguments, 1))
message = `${prefix}${message}\nhttp://www.js-data.io/v3.0/docs/errors#${code}`
return new Error(message)
}
},
/**
* 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.
*/
eventify (target, getter, setter) {
target = target || this
let _events = {}
if (!getter && !setter) {
getter = function () { return _events }
setter = function (value) { _events = value }
}
Object.defineProperties(target, {
emit: {
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)
}
}
},
off: {
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)
}
}
},
on: {
value (type, func, ctx) {
if (!getter.call(this)) {
setter.call(this, {})
}
const events = getter.call(this)
events[type] = events[type] || []
events[type].push({
c: ctx,
f: func
})
}
}
})
},
/**
* TODO
*
* @ignore
*/
extend (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) {
utils.classCallCheck(this, subClass)
superClass.apply(this, args)
}
}
// Setup inheritance of instance members
subClass.prototype = Object.create(superClass && superClass.prototype, {
constructor: {
configurable: true,
enumerable: false,
value: subClass,
writable: true
}
})
const obj = Object
// Setup inheritance of static members
if (obj.setPrototypeOf) {
obj.setPrototypeOf(subClass, superClass)
} else if (classProps.strictEs6Class) {
subClass.__proto__ = superClass // eslint-disable-line
} else {
utils.forOwn(superClass, function (value, key) {
subClass[key] = value
})
}
Object.defineProperty(subClass, '__super__', {
configurable: true,
value: superClass
})
utils.addHiddenPropsToTarget(subClass.prototype, props)
utils.fillIn(subClass, classProps)
return subClass
},
/**
* 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.
*/
fillIn (dest, src) {
utils.forOwn(src, function (value, key) {
if (!dest.hasOwnProperty(key) || dest[key] === undefined) {
dest[key] = value
}
})
return dest
},
/**
* Find the index of something according to the given checker function.
*
* @ignore
* @param {Array} array The array to search.
* @param {Function} fn Checker function.
* @param {number} Index if found or -1 if not found.
*/
findIndex (array, fn) {
let index = -1
if (!array) {
return index
}
array.forEach(function (record, i) {
if (fn(record)) {
index = i
return false
}
})
return index
},
/**
* TODO
*
* @ignore
*/
forEachRelation (mapper, opts, fn, ctx) {
const relationList = mapper.relationList || []
if (!relationList.length) {
return
}
relationList.forEach(function (def) {
utils._forRelation(opts, def, fn, ctx)
})
},
/**
* 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`.
*/
forOwn (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)
}
},
/**
* Proxy for `JSON.parse`.
*
* @ignore
* @param {string} json JSON to parse.
* @returns {Object} Parsed object.
*/
fromJson (json) {
return utils.isString(json) ? JSON.parse(json) : json
},
/**
* TODO
*
* @ignore
*/
'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) { // eslint-disable-line
return
}
}
return object[last]
},
/**
* TODO
*
* @ignore
*/
getSuper (instance, isCtor) {
const ctor = isCtor ? instance : instance.constructor
return (ctor.__super__ || Object.getPrototypeOf(ctor) || ctor.__proto__) // eslint-disable-line
},
/**
* Return the intersection of two arrays.
*
* @ignore
* @param {Array} array1 First array.
* @param {Array} array2 Second array.
* @returns {Array} Array of elements common to both arrays.
*/
intersection (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
},
/**
* TODO
*
* @ignore
*/
isArray: Array.isArray,
/**
* 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.
* @returns {boolean} Whether `prop` was matched.
*/
isBlacklisted (prop, bl) {
if (!bl || !bl.length) {
return false
}
let matches
for (var i = 0; i < bl.length; i++) {
if ((toStr(bl[i]) === REGEXP_TAG && bl[i].test(prop)) || bl[i] === prop) {
matches = prop
return matches
}
}
return !!matches
},
/**
* TODO
*
* @ignore
*/
isBoolean (value) {
return toStr(value) === BOOL_TAG
},
/**
* TODO
*
* @ignore
*/
isBrowser: false,
/**
* TODO
*
* @ignore
*/
isDate (value) {
return (value && typeof value === 'object' && toStr(value) === DATE_TAG)
},
/**
* TODO
*
* @ignore
*/
isFunction (value) {
return typeof value === 'function' || (value && toStr(value) === FUNC_TAG)
},
/**
* TODO
*
* @ignore
*/
isInteger (value) {
return toStr(value) === NUMBER_TAG && value == toInteger(value) // eslint-disable-line
},
/**
* TODO
*
* @ignore
*/
isNull (value) {
return value === null
},
/**
* TODO
*
* @ignore
*/
isNumber (value) {
const type = typeof value
return type === 'number' || (value && type === 'object' && toStr(value) === NUMBER_TAG)
},
/**
* TODO
*
* @ignore
*/
isObject (value) {
return toStr(value) === OBJECT_TAG
},
/**
* TODO
*
* @ignore
*/
isRegExp (value) {
return toStr(value) === REGEXP_TAG
},
/**
* TODO
*
* @ignore
*/
isSorN (value) {
return utils.isString(value) || utils.isNumber(value)
},
/**
* TODO
*
* @ignore
*/
isString (value) {
return typeof value === 'string' || (value && typeof value === 'object' && toStr(value) === STRING_TAG)
},
/**
* TODO
*
* @ignore
*/
isUndefined (value) {
return value === undefined
},
/**
* TODO
*
* @ignore
*/
logify (target) {
utils.addHiddenPropsToTarget(target, {
dbg (...args) {
this.log('debug', ...args)
},
log (level, ...args) {
if (level && !args.length) {
args.push(level)
level = 'debug'
}
if (level === 'debug' && !this.debug) {
return
}
const prefix = `${level.toUpperCase()}: (${this.name || this.constructor.name})`
if (console[level]) {
console[level](prefix, ...args)
} else {
console.log(prefix, ...args)
}
}
})
},
/**
* TODO
*
* @ignore
*/
noDupeAdd (array, record, fn) {
if (!array) {
return
}
const index = this.findIndex(array, fn)
if (index < 0) {
array.push(record)
}
},
/**
* TODO
*
* @ignore
*/
omit (props, keys) {
// Remove relations
const _props = {}
utils.forOwn(props, function (value, key) {
if (keys.indexOf(key) === -1) {
_props[key] = value
}
})
return _props
},
/**
* TODO
*
* @ignore
*/
plainCopy (from) {
return utils.copy(from, undefined, undefined, undefined, undefined, true)
},
/**
* Proxy for `Promise.reject`.
*
* @ignore
* @param {*} [value] Value with which to reject the Promise.
* @returns {Promise} Promise reject with `value`.
*/
reject (value) {
return utils.Promise.reject(value)
},
/**
* TODO
*
* @ignore
*/
remove (array, fn) {
if (!array || !array.length) {
return
}
const index = this.findIndex(array, fn)
if (index >= 0) {
array.splice(index, 1)
}
},
/**
* Proxy for `Promise.resolve`.
*
* @ignore
* @param {*} [value] Value with which to resolve the Promise.
* @returns {Promise} Promise resolved with `value`.
*/
resolve (value) {
return utils.Promise.resolve(value)
},
/**
* 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.
*/
set: function (object, path, value) {
if (utils.isObject(path)) {
utils.forOwn(path, function (value, _path) {
utils.set(object, _path, value)
})
} else {
const parts = PATH.exec(path)
if (parts) {
mkdirP(object, parts[1])[parts[2]] = value
} else {
object[path] = value
}
}
},
/**
* TODO
*
* @ignore
*/
strictEqual (a, b) {
let _equal = a === b
if (!_equal) {
if (utils.isObject(a) && utils.isObject(b)) {
utils.forOwn(a, function (value, key) {
_equal = _equal && utils.strictEqual(value, b[key])
})
utils.forOwn(b, function (value, key) {
_equal = _equal && utils.strictEqual(value, a[key])
})
} else if (utils.isArray(a) && utils.isArray(b)) {
a.forEach(function (value, i) {
_equal = _equal && utils.strictEqual(value, b[i])
})
}
}
return _equal
},
/**
* Proxy for `JSON.stringify`.
*
* @ignore
* @param {*} value Value to serialize to JSON.
* @returns {string} JSON string.
*/
toJson: JSON.stringify,
/**
* Unset the value at the provided key or path.
*
* @ignore
* @param {Object} object The object from which to delete the property.
* @param {string} path The key or path to the property.
*/
unset (object, path) {
const parts = path.split('.')
const last = parts.pop()
while (path = parts.shift()) { // eslint-disable-line
object = object[path]
if (object == null) { // eslint-disable-line
return
}
}
object[last] = undefined
}
}
// Attempt to detect whether we are in the browser.
try {
utils.isBrowser = !!window
} catch (e) {
utils.isBrowser = false
}
export default utils
js-data