/* @flow */

// These util functions are split into its own file because Rollup cannot drop
// makeMap() due to potential side effects, so these variables end up
// bloating the web builds.

import { makeMap, noop } from 'shared/util'

export const isReservedTag = makeMap(
  'template,script,style,element,content,slot,link,meta,svg,view,' +
  'a,div,img,image,text,span,input,switch,textarea,spinner,select,' +
  'slider,slider-neighbor,indicator,canvas,' +
  'list,cell,header,loading,loading-indicator,refresh,scrollable,scroller,' +
  'video,web,embed,tabbar,tabheader,datepicker,timepicker,marquee,countdown',
  true
)

// Elements that you can, intentionally, leave open (and which close themselves)
// more flexible than web
export const canBeLeftOpenTag = makeMap(
  'web,spinner,switch,video,textarea,canvas,' +
  'indicator,marquee,countdown',
  true
)

export const isRuntimeComponent = makeMap(
  'richtext,transition,transition-group',
  true
)

export const isUnaryTag = makeMap(
  'embed,img,image,input,link,meta',
  true
)

export function mustUseProp (): boolean {
  return false
}

export function getTagNamespace (): void { }

export function isUnknownElement (): boolean {
  return false
}

export function query (el: string | Element, document: Object) {
  // document is injected by weex factory wrapper
  const placeholder = document.createComment('root')
  placeholder.hasAttribute = placeholder.removeAttribute = noop // hack for patch
  document.documentElement.appendChild(placeholder)
  return placeholder
}