directive.js
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/* @flow */
import { warn, isPlainObject, looseEqual } from './util'
export function bind (el: any, binding: Object, vnode: any): void {
if (!assert(el, vnode)) { return }
t(el, binding, vnode)
}
export function update (el: any, binding: Object, vnode: any, oldVNode: any): void {
if (!assert(el, vnode)) { return }
const i18n: any = vnode.context.$i18n
if (localeEqual(el, vnode) &&
(looseEqual(binding.value, binding.oldValue) &&
looseEqual(el._localeMessage, i18n.getLocaleMessage(i18n.locale)))) { return }
t(el, binding, vnode)
}
export function unbind (el: any, binding: Object, vnode: any, oldVNode: any): void {
const vm: any = vnode.context
if (!vm) {
warn('Vue instance does not exists in VNode context')
return
}
const i18n: any = vnode.context.$i18n || {}
if (!binding.modifiers.preserve && !i18n.preserveDirectiveContent) {
el.textContent = ''
}
el._vt = undefined
delete el['_vt']
el._locale = undefined
delete el['_locale']
el._localeMessage = undefined
delete el['_localeMessage']
}
function assert (el: any, vnode: any): boolean {
const vm: any = vnode.context
if (!vm) {
warn('Vue instance does not exists in VNode context')
return false
}
if (!vm.$i18n) {
warn('VueI18n instance does not exists in Vue instance')
return false
}
return true
}
function localeEqual (el: any, vnode: any): boolean {
const vm: any = vnode.context
return el._locale === vm.$i18n.locale
}
function t (el: any, binding: Object, vnode: any): void {
const value: any = binding.value
const { path, locale, args, choice } = parseValue(value)
if (!path && !locale && !args) {
warn('value type not supported')
return
}
if (!path) {
warn('`path` is required in v-t directive')
return
}
const vm: any = vnode.context
if (choice) {
el._vt = el.textContent = vm.$i18n.tc(path, choice, ...makeParams(locale, args))
} else {
el._vt = el.textContent = vm.$i18n.t(path, ...makeParams(locale, args))
}
el._locale = vm.$i18n.locale
el._localeMessage = vm.$i18n.getLocaleMessage(vm.$i18n.locale)
}
function parseValue (value: any): Object {
let path: ?string
let locale: ?Locale
let args: any
let choice: ?number
if (typeof value === 'string') {
path = value
} else if (isPlainObject(value)) {
path = value.path
locale = value.locale
args = value.args
choice = value.choice
}
return { path, locale, args, choice }
}
function makeParams (locale: Locale, args: any): Array<any> {
const params: Array<any> = []
locale && params.push(locale)
if (args && (Array.isArray(args) || isPlainObject(args))) {
params.push(args)
}
return params
}