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/* @flow */
import {
tip,
hasOwn,
isDef,
isUndef,
hyphenate,
formatComponentName
} from 'core/util/index'
export function extractPropsFromVNodeData (
data: VNodeData,
Ctor: Class<Component>,
tag?: string
): ?Object {
// we are only extracting raw values here.
// validation and default values are handled in the child
// component itself.
const propOptions = Ctor.options.props
if (isUndef(propOptions)) {
return
}
const res = {}
const { attrs, props } = data
if (isDef(attrs) || isDef(props)) {
for (const key in propOptions) {
const altKey = hyphenate(key)
if (process.env.NODE_ENV !== 'production') {
const keyInLowerCase = key.toLowerCase()
if (
key !== keyInLowerCase &&
attrs && hasOwn(attrs, keyInLowerCase)
) {
tip(
`Prop "${keyInLowerCase}" is passed to component ` +
`${formatComponentName(tag || Ctor)}, but the declared prop name is` +
` "${key}". ` +
`Note that HTML attributes are case-insensitive and camelCased ` +
`props need to use their kebab-case equivalents when using in-DOM ` +
`templates. You should probably use "${altKey}" instead of "${key}".`
)
}
}
checkProp(res, props, key, altKey, true) ||
checkProp(res, attrs, key, altKey, false)
}
}
return res
}
function checkProp (
res: Object,
hash: ?Object,
key: string,
altKey: string,
preserve: boolean
): boolean {
if (isDef(hash)) {
if (hasOwn(hash, key)) {
res[key] = hash[key]
if (!preserve) {
delete hash[key]
}
return true
} else if (hasOwn(hash, altKey)) {
res[key] = hash[altKey]
if (!preserve) {
delete hash[altKey]
}
return true
}
}
return false
}