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typed.js
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typed.js
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import * as Immutable from 'immutable'
if (typeof(Symbol) === 'undefined') {
var Symbol = hint => `@@${hint}`
Symbol.for = Symbol
}
function Construct() {}
export const construct = value => {
Construct.prototype = value.constructor.prototype
return new Construct()
}
const $type = Symbol.for("typed/type")
const $store = Symbol.for("typed/store")
const $empty = Symbol.for("typed/empty")
const $maybe = Symbol.for("typed/type/maybe")
const $default = Symbol.for("typed/type/default")
const $label = Symbol.for("typed/type/label")
const $init = Symbol.for("transducer/init")
const $result = Symbol.for("transducer/result")
const $step = Symbol.for("transducer/step")
const $read = Symbol.for("typed/type/read")
const $parse = Symbol.for("typed/type/parse")
const $typeName = Symbol("typed/type/name")
const $typeSignature = Symbol("typed/type/signature")
export const Typed = function(label, parse, defaultValue) {
class ValueType extends Type {
constructor(defaultValue) {
super()
this[$default] = defaultValue
}
}
const prototype = ValueType.prototype
prototype[$default] = defaultValue
prototype[$parse] = parse
prototype[$label] = label
const TypedValue = function(defaultValue) {
return defaultValue === void(0) ? prototype :
new ValueType(defaultValue)
}
TypedValue.prototype = prototype
return TypedValue
}
Typed.label = $label
Typed.defaultValue = $default
Typed.read = $read
Typed.typeName = $typeName
Typed.typeSignature = $typeSignature
Typed.type = $type
Typed.store = $store
Typed.init = $init
Typed.result = $result
Typed.step = $step
Typed.DELETE = "delete"
Typed.empty = $empty
const typeName = type => type[$typeName]()
const typeSignature = type => type[$typeSignature]()
export class Type {
constructor() {}
[Typed.read](value=this[$default]) {
return this[$parse](value)
}
[Typed.parse](value) {
throw TypeError(`Type implementation must implement "[read.symbol]" method`)
}
[Typed.typeName]() {
const label = this[$label]
const defaultValue = this[$default]
return defaultValue === void(0) ? label : `${label}(${JSON.stringify(defaultValue)})`
}
}
const ObjectPrototype = Object.prototype
// Returns `true` if given `x` is a JS array.
const isArray = Array.isArray ||
(x => ObjectPrototype.toString.call(x) === '[object Array]')
// Returns `true` if given `x` is a regular expression.
const isRegExp = x =>
ObjectPrototype.toString.call(x) === '[object RegExp]'
export const typeOf = (x, type=typeof(x)) =>
x === void(0) ? x :
x === null ? x :
x[$read] ? x :
(x.prototype && x.prototype[$read]) ? x.prototype :
type === "number" ? new Typed.Number(x) :
type === "string" ? new Typed.String(x) :
type === "boolean" ? new Typed.Boolean(x) :
type === "symbol" ? new Typed.Symbol(x) :
isArray(x) ? Typed.Array(x) :
isRegExp(x) ? new Typed.RegExp(x) :
x === String ? Typed.String.prototype :
x === Number ? Typed.Number.prototype :
x === Boolean ? Typed.Boolean.prototype :
x === RegExp ? Typed.RegExp.prototype :
x === Array ? Typed.Array.prototype :
x === Symbol ? Typed.Symbol.prototype :
x === Date ? Typed.Date.prototype :
// support Immutable objects
typeof x.toJS === 'function' ? new Typed.ImmutableClass(x.constructor)(x) :
// support Immutable classes -- all Immutable classes have `isX` static
// methods, e.g. List.isList, Map.isMap, Set.isSet; using this to
// approximate that
typeof x[`is${x.name}`] === 'function' ? Typed.ImmutableClass(x).prototype :
Any;
export const Any = Typed("Any", value => value)()
Typed.Any = Any
Typed.Number = Typed("Number", value =>
typeof(value) === "number" ? value :
TypeError(`"${value}" is not a number`))
Typed.String = Typed("String", value =>
typeof(value) === "string" ? value :
TypeError(`"${value}" is not a string`))
Typed.Symbol = Typed("Symbol", value =>
typeof(value) === "symbol" ? value :
TypeError(`"${value}" is not a symbol`))
Typed.Array = Typed("Array", value =>
isArray(value) ? value :
TypeError(`"${value}" is not an array`))
Typed.RegExp = Typed("RegExp", value =>
value instanceof RegExp ? value :
TypeError(`"${value}" is not a regexp`))
Typed.Boolean = Typed("Boolean", value =>
value === true ? true :
value === false ? false :
TypeError(`"${value}" is not a boolean`))
Typed.Date = Typed("Date", value => {
var d = new Date(value)
if (isNaN(d.valueOf())) {
return new TypeError(`"${value}" is not a valid date.`)
}
return d
})
Typed.ImmutableClass = cls => Typed(`Immutable.${cls.name}`, value => {
if (value instanceof cls) {
return value
}
else if (typeof value === 'undefined' || value === null) {
return new TypeError(`Expected ${cls.name}; got nothing.`)
}
else {
try { return new cls(value); }
catch (ex) { return ex; }
}
})
class MaybeType extends Type {
constructor(type) {
super()
this[$type] = type
}
[Typed.typeName]() {
return `Maybe(${this[$type][$typeName]()})`
}
[Typed.read](value) {
const result = value == null ? null : this[$type][$read](value)
return !(result instanceof TypeError) ? result :
TypeError(`"${value}" is not nully nor it is of ${this[$type][$typeName]()} type`)
}
}
export const Maybe = Type => {
const type = typeOf(Type)
if (type === Any) {
throw TypeError(`${Type} is not a valid type`)
}
return type[$maybe] || (type[$maybe] = new MaybeType(type))
}
Maybe.Type = MaybeType
class UnionType extends Type {
constructor(variants) {
super()
this[$type] = variants
}
[Typed.typeName]() {
return `Union(${this[$type].map(typeName).join(', ')})`
}
[Typed.read](value) {
const variants = this[$type]
const count = variants.length
let index = 0
while (index < count) {
const variant = variants[index]
if (value instanceof variant.constructor) {
return value
}
index = index + 1
}
index = 0
while (index < count) {
const result = variants[index][$read](value)
if (!(result instanceof TypeError)) {
return result
}
index = index + 1
}
return TypeError(`"${value}" does not satisfy ${this[$typeName]()} type`)
}
}
// Returns `xs` excluding any values that are included in `ys`.
const subtract = (xs, ys) =>
xs.filter(x => ys.indexOf(x) < 0)
// Returns array including all values from `xs` and all values from
// `ys` that aren't already included in `xs`. It will also attempt
// to return either `xs` or `ys` if one of them is a superset of other.
// return `xs` or `ys` if
const union = (xs, ys) => {
// xs can be superset only if it contains more items then
// ys. If that's a case find items in ys that arent included
// in xs. If such items do not exist return back `xs` otherwise
// return concatination of xs with those items.
// those items
if (xs.length > ys.length) {
const diff = subtract(ys, xs)
return diff.length === 0 ? xs : xs.concat(diff)
}
// if number of items in xs is not greater than number of items in ys
// then either xs is either subset or equal of `ys`. There for we find
// ys that are not included in `xs` if such items aren't found ys is
// either superset or equal so just return ys otherwise return concatination
// of those items with `ys`.