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Viewing file:     stylis-plugins.js (5.28 KB)      -rw-r--r--

import {
  compile,
  alloc,
  dealloc,
  next,
  delimit,
  token,
  char,
  from,
  identifier,
  peek,
  position
} from 'stylis'

const last = arr => (arr.length ? arr[arr.length - 1] : null)

const toRules = (parsed, points) => {
  // pretend we've started with a comma
  let index = -1
  let character = 44

  do {
    switch (token(character)) {
      case 0:
        // &\f
        if (character === 38 && peek() === 12) {
          // this is not 100% correct, we don't account for literal sequences here - like for example quoted strings
          // stylis inserts \f after & to know when & where it should replace this sequence with the context selector
          // and when it should just concatenate the outer and inner selectors
          // it's very unlikely for this sequence to actually appear in a different context, so we just leverage this fact here
          points[index] = 1
        }
        parsed[index] += identifier(position - 1)
        break
      case 2:
        parsed[index] += delimit(character)
        break
      case 4:
        // comma
        if (character === 44) {
          // colon
          parsed[++index] = peek() === 58 ? '&\f' : ''
          points[index] = parsed[index].length
          break
        }
      // fallthrough
      default:
        parsed[index] += from(character)
    }
  } while ((character = next()))

  return parsed
}

const getRules = (value, points) => dealloc(toRules(alloc(value), points))

// WeakSet would be more appropriate, but only WeakMap is supported in IE11
const fixedElements = /* #__PURE__ */ new WeakMap()

export let compat = element => {
  if (
    element.type !== 'rule' ||
    !element.parent ||
    // .length indicates if this rule contains pseudo or not
    !element.length
  ) {
    return
  }

  let { value, parent } = element
  let isImplicitRule =
    element.column === parent.column && element.line === parent.line

  while (parent.type !== 'rule') {
    parent = parent.parent
    if (!parent) return
  }

  // short-circuit for the simplest case
  if (
    element.props.length === 1 &&
    value.charCodeAt(0) !== 58 /* colon */ &&
    !fixedElements.get(parent)
  ) {
    return
  }

  // if this is an implicitly inserted rule (the one eagerly inserted at the each new nested level)
  // then the props has already been manipulated beforehand as they that array is shared between it and its "rule parent"
  if (isImplicitRule) {
    return
  }

  fixedElements.set(element, true)

  const points = []
  const rules = getRules(value, points)
  const parentRules = parent.props

  for (let i = 0, k = 0; i < rules.length; i++) {
    for (let j = 0; j < parentRules.length; j++, k++) {
      element.props[k] = points[i]
        ? rules[i].replace(/&\f/g, parentRules[j])
        : `${parentRules[j]} ${rules[i]}`
    }
  }
}

export let removeLabel = element => {
  if (element.type === 'decl') {
    var value = element.value
    if (
      // charcode for l
      value.charCodeAt(0) === 108 &&
      // charcode for b
      value.charCodeAt(2) === 98
    ) {
      // this ignores label
      element.return = ''
      element.value = ''
    }
  }
}

const ignoreFlag =
  'emotion-disable-server-rendering-unsafe-selector-warning-please-do-not-use-this-the-warning-exists-for-a-reason'

const isIgnoringComment = element =>
  !!element &&
  element.type === 'comm' &&
  element.children.indexOf(ignoreFlag) > -1

export let createUnsafeSelectorsAlarm = cache => (element, index, children) => {
  if (element.type !== 'rule') return

  const unsafePseudoClasses = element.value.match(
    /(:first|:nth|:nth-last)-child/g
  )

  if (unsafePseudoClasses && cache.compat !== true) {
    const prevElement = index > 0 ? children[index - 1] : null
    if (prevElement && isIgnoringComment(last(prevElement.children))) {
      return
    }
    unsafePseudoClasses.forEach(unsafePseudoClass => {
      console.error(
        `The pseudo class "${unsafePseudoClass}" is potentially unsafe when doing server-side rendering. Try changing it to "${
          unsafePseudoClass.split('-child')[0]
        }-of-type".`
      )
    })
  }
}

let isImportRule = element =>
  element.type.charCodeAt(1) === 105 && element.type.charCodeAt(0) === 64

const isPrependedWithRegularRules = (index, children) => {
  for (let i = index - 1; i >= 0; i--) {
    if (!isImportRule(children[i])) {
      return true
    }
  }
  return false
}

// use this to remove incorrect elements from further processing
// so they don't get handed to the `sheet` (or anything else)
// as that could potentially lead to additional logs which in turn could be overhelming to the user
const nullifyElement = element => {
  element.type = ''
  element.value = ''
  element.return = ''
  element.children = ''
  element.props = ''
}

export let incorrectImportAlarm = (element, index, children) => {
  if (!isImportRule(element)) {
    return
  }

  if (element.parent) {
    console.error(
      "`@import` rules can't be nested inside other rules. Please move it to the top level and put it before regular rules. Keep in mind that they can only be used within global styles."
    )
    nullifyElement(element)
  } else if (isPrependedWithRegularRules(index, children)) {
    console.error(
      "`@import` rules can't be after other rules. Please put your `@import` rules before your other rules."
    )
    nullifyElement(element)
  }
}