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Filename : flexFlow.js

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import { regExpToken, SPACE } from '../tokenTypes'

const FLEX_WRAP = regExpToken(/(nowrap|wrap|wrap-reverse)/)
const FLEX_DIRECTION = regExpToken(/(row|row-reverse|column|column-reverse)/)

const defaultFlexWrap = 'nowrap'
const defaultFlexDirection = 'row'

export default tokenStream => {
  let flexWrap
  let flexDirection

  let partsParsed = 0
  while (partsParsed < 2 && tokenStream.hasTokens()) {
    if (partsParsed !== 0) tokenStream.expect(SPACE)

    if (flexWrap === undefined && tokenStream.matches(FLEX_WRAP)) {
      flexWrap = tokenStream.lastValue
    } else if (
      flexDirection === undefined &&
      tokenStream.matches(FLEX_DIRECTION)
    ) {
      flexDirection = tokenStream.lastValue
    } else {
      tokenStream.throw()
    }

    partsParsed += 1
  }

  tokenStream.expectEmpty()

  if (flexWrap === undefined) flexWrap = defaultFlexWrap
  if (flexDirection === undefined) flexDirection = defaultFlexDirection

  return { flexWrap, flexDirection }
}