327 lines
9.0 KiB
TypeScript
327 lines
9.0 KiB
TypeScript
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import { immutable, unwrap } from '@vue/observer'
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import {
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EMPTY_OBJ,
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camelize,
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hyphenate,
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capitalize,
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isString,
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isFunction,
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isArray,
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isObject
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} from '@vue/shared'
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import { warn } from './warning'
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import { Data, ComponentHandle } from './component'
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export type ComponentPropsOptions<P = Data> = {
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[K in keyof P]: PropValidator<P[K]>
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}
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export type Prop<T> = { (): T } | { new (...args: any[]): T & object }
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export type PropType<T> = Prop<T> | Prop<T>[]
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export type PropValidator<T> = PropOptions<T> | PropType<T>
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export interface PropOptions<T = any> {
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type?: PropType<T> | true | null
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required?: boolean
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default?: T | null | undefined | (() => T | null | undefined)
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validator?(value: T): boolean
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}
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const enum BooleanFlags {
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shouldCast = '1',
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shouldCastTrue = '2'
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}
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type NormalizedProp = PropOptions & {
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[BooleanFlags.shouldCast]?: boolean
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[BooleanFlags.shouldCastTrue]?: boolean
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}
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type NormalizedPropsOptions = Record<string, NormalizedProp>
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const isReservedKey = (key: string): boolean => key[0] === '_' || key[0] === '$'
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export function initializeProps(
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instance: ComponentHandle,
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options: NormalizedPropsOptions | undefined,
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data: Data | null
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) {
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const { 0: props, 1: attrs } = resolveProps(data, options)
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instance.$props = __DEV__ ? immutable(props) : props
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instance.$attrs = options
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? __DEV__
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? immutable(attrs)
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: attrs
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: instance.$props
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}
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// resolve raw VNode data.
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// - filter out reserved keys (key, ref, slots)
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// - extract class and style into $attrs (to be merged onto child
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// component root)
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// - for the rest:
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// - if has declared props: put declared ones in `props`, the rest in `attrs`
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// - else: everything goes in `props`.
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const EMPTY_PROPS = [EMPTY_OBJ, EMPTY_OBJ] as [Data, Data]
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export function resolveProps(
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rawData: any,
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_options: ComponentPropsOptions | void
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): [Data, Data] {
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const hasDeclaredProps = _options != null
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const options = normalizePropsOptions(_options) as NormalizedPropsOptions
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if (!rawData && !hasDeclaredProps) {
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return EMPTY_PROPS
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}
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const props: any = {}
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let attrs: any = void 0
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if (rawData != null) {
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for (const key in rawData) {
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// key, ref, slots are reserved
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if (key === 'key' || key === 'ref' || key === 'slots') {
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continue
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}
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// any non-declared data are put into a separate `attrs` object
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// for spreading
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if (hasDeclaredProps && !options.hasOwnProperty(key)) {
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;(attrs || (attrs = {}))[key] = rawData[key]
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} else {
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props[key] = rawData[key]
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}
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}
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}
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// set default values, cast booleans & run validators
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if (hasDeclaredProps) {
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for (const key in options) {
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let opt = options[key]
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if (opt == null) continue
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const isAbsent = !props.hasOwnProperty(key)
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const hasDefault = opt.hasOwnProperty('default')
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const currentValue = props[key]
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// default values
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if (hasDefault && currentValue === undefined) {
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const defaultValue = opt.default
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props[key] = isFunction(defaultValue) ? defaultValue() : defaultValue
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}
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// boolean casting
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if (opt[BooleanFlags.shouldCast]) {
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if (isAbsent && !hasDefault) {
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props[key] = false
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} else if (
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opt[BooleanFlags.shouldCastTrue] &&
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(currentValue === '' || currentValue === hyphenate(key))
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) {
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props[key] = true
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}
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}
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// runtime validation
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if (__DEV__ && rawData) {
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validateProp(key, unwrap(rawData[key]), opt, isAbsent)
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}
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}
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} else {
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// if component has no declared props, $attrs === $props
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attrs = props
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}
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return [props, attrs]
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}
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const normalizationMap = new WeakMap()
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function normalizePropsOptions(
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raw: ComponentPropsOptions | void
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): NormalizedPropsOptions | void {
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if (!raw) {
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return
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}
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if (normalizationMap.has(raw)) {
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return normalizationMap.get(raw)
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}
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const normalized: NormalizedPropsOptions = {}
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normalizationMap.set(raw, normalized)
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if (isArray(raw)) {
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for (let i = 0; i < raw.length; i++) {
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if (__DEV__ && !isString(raw[i])) {
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warn(`props must be strings when using array syntax.`, raw[i])
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}
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const normalizedKey = camelize(raw[i])
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if (!isReservedKey(normalizedKey)) {
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normalized[normalizedKey] = EMPTY_OBJ
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} else if (__DEV__) {
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warn(`Invalid prop name: "${normalizedKey}" is a reserved property.`)
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}
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}
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} else {
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if (__DEV__ && !isObject(raw)) {
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warn(`invalid props options`, raw)
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}
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for (const key in raw) {
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const normalizedKey = camelize(key)
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if (!isReservedKey(normalizedKey)) {
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const opt = raw[key]
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const prop = (normalized[normalizedKey] =
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isArray(opt) || isFunction(opt) ? { type: opt } : opt)
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if (prop) {
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const booleanIndex = getTypeIndex(Boolean, prop.type)
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const stringIndex = getTypeIndex(String, prop.type)
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;(prop as NormalizedProp)[BooleanFlags.shouldCast] = booleanIndex > -1
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;(prop as NormalizedProp)[BooleanFlags.shouldCastTrue] =
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booleanIndex < stringIndex
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}
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} else if (__DEV__) {
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warn(`Invalid prop name: "${normalizedKey}" is a reserved property.`)
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}
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}
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}
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return normalized
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}
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// use function string name to check type constructors
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// so that it works across vms / iframes.
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function getType(ctor: Prop<any>): string {
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const match = ctor && ctor.toString().match(/^\s*function (\w+)/)
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return match ? match[1] : ''
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}
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function isSameType(a: Prop<any>, b: Prop<any>): boolean {
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return getType(a) === getType(b)
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}
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function getTypeIndex(
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type: Prop<any>,
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expectedTypes: PropType<any> | void | null | true
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): number {
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if (isArray(expectedTypes)) {
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for (let i = 0, len = expectedTypes.length; i < len; i++) {
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if (isSameType(expectedTypes[i], type)) {
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return i
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}
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}
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} else if (isObject(expectedTypes)) {
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return isSameType(expectedTypes, type) ? 0 : -1
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}
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return -1
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}
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type AssertionResult = {
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valid: boolean
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expectedType: string
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}
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function validateProp(
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name: string,
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value: any,
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prop: PropOptions<any>,
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isAbsent: boolean
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) {
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const { type, required, validator } = prop
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// required!
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if (required && isAbsent) {
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warn('Missing required prop: "' + name + '"')
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return
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}
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// missing but optional
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if (value == null && !prop.required) {
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return
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}
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// type check
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if (type != null && type !== true) {
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let isValid = false
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const types = isArray(type) ? type : [type]
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const expectedTypes = []
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// value is valid as long as one of the specified types match
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for (let i = 0; i < types.length && !isValid; i++) {
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const { valid, expectedType } = assertType(value, types[i])
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expectedTypes.push(expectedType || '')
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isValid = valid
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}
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if (!isValid) {
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warn(getInvalidTypeMessage(name, value, expectedTypes))
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return
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}
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}
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// custom validator
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if (validator && !validator(value)) {
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warn('Invalid prop: custom validator check failed for prop "' + name + '".')
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}
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}
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const simpleCheckRE = /^(String|Number|Boolean|Function|Symbol)$/
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function assertType(value: any, type: Prop<any>): AssertionResult {
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let valid
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const expectedType = getType(type)
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if (simpleCheckRE.test(expectedType)) {
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const t = typeof value
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valid = t === expectedType.toLowerCase()
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// for primitive wrapper objects
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if (!valid && t === 'object') {
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valid = value instanceof type
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}
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} else if (expectedType === 'Object') {
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valid = toRawType(value) === 'Object'
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} else if (expectedType === 'Array') {
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valid = isArray(value)
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} else {
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valid = value instanceof type
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}
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return {
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valid,
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expectedType
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}
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}
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function getInvalidTypeMessage(
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name: string,
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value: any,
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expectedTypes: string[]
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): string {
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let message =
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`Invalid prop: type check failed for prop "${name}".` +
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` Expected ${expectedTypes.map(capitalize).join(', ')}`
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const expectedType = expectedTypes[0]
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const receivedType = toRawType(value)
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const expectedValue = styleValue(value, expectedType)
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const receivedValue = styleValue(value, receivedType)
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// check if we need to specify expected value
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if (
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expectedTypes.length === 1 &&
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isExplicable(expectedType) &&
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!isBoolean(expectedType, receivedType)
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) {
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message += ` with value ${expectedValue}`
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}
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message += `, got ${receivedType} `
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// check if we need to specify received value
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if (isExplicable(receivedType)) {
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message += `with value ${receivedValue}.`
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}
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return message
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}
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function styleValue(value: any, type: string): string {
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if (type === 'String') {
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return `"${value}"`
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} else if (type === 'Number') {
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return `${Number(value)}`
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} else {
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return `${value}`
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}
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}
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function toRawType(value: any): string {
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return Object.prototype.toString.call(value).slice(8, -1)
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}
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function isExplicable(type: string): boolean {
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const explicitTypes = ['string', 'number', 'boolean']
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return explicitTypes.some(elem => type.toLowerCase() === elem)
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}
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function isBoolean(...args: string[]): boolean {
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return args.some(elem => elem.toLowerCase() === 'boolean')
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}
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