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Viewing file:     index.js (11.31 KB)      -rw-r--r--

// @flow
import type {
  Interpolation,
  SerializedStyles,
  RegisteredCache
} from '@emotion/utils'
import hashString from '@emotion/hash'
import unitless from '@emotion/unitless'
import memoize from '@emotion/memoize'

const ILLEGAL_ESCAPE_SEQUENCE_ERROR = `You have illegal escape sequence in your template literal, most likely inside content's property value.
Because you write your CSS inside a JavaScript string you actually have to do double escaping, so for example "content: '\\00d7';" should become "content: '\\\\00d7';".
You can read more about this here:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals#ES2018_revision_of_illegal_escape_sequences`

const UNDEFINED_AS_OBJECT_KEY_ERROR =
  "You have passed in falsy value as style object's key (can happen when in example you pass unexported component as computed key)."

let hyphenateRegex = /[A-Z]|^ms/g
let animationRegex = /_EMO_([^_]+?)_([^]*?)_EMO_/g

const isCustomProperty = (property: string) => property.charCodeAt(1) === 45
const isProcessableValue = value => value != null && typeof value !== 'boolean'

const processStyleName = /* #__PURE__ */ memoize(
  (styleName: string) =>
    isCustomProperty(styleName)
      ? styleName
      : styleName.replace(hyphenateRegex, '-$&').toLowerCase()
)

let processStyleValue = (
  key: string,
  value: string | number
): string | number => {
  switch (key) {
    case 'animation':
    case 'animationName': {
      if (typeof value === 'string') {
        return value.replace(animationRegex, (match, p1, p2) => {
          cursor = {
            name: p1,
            styles: p2,
            next: cursor
          }
          return p1
        })
      }
    }
  }

  if (
    unitless[key] !== 1 &&
    !isCustomProperty(key) &&
    typeof value === 'number' &&
    value !== 0
  ) {
    return value + 'px'
  }
  return value
}

if (process.env.NODE_ENV !== 'production') {
  let contentValuePattern = /(attr|counters?|url|(((repeating-)?(linear|radial))|conic)-gradient)\(|(no-)?(open|close)-quote/
  let contentValues = ['normal', 'none', 'initial', 'inherit', 'unset']

  let oldProcessStyleValue = processStyleValue

  let msPattern = /^-ms-/
  let hyphenPattern = /-(.)/g

  let hyphenatedCache = {}

  processStyleValue = (key: string, value: string) => {
    if (key === 'content') {
      if (
        typeof value !== 'string' ||
        (contentValues.indexOf(value) === -1 &&
          !contentValuePattern.test(value) &&
          (value.charAt(0) !== value.charAt(value.length - 1) ||
            (value.charAt(0) !== '"' && value.charAt(0) !== "'")))
      ) {
        throw new Error(
          `You seem to be using a value for 'content' without quotes, try replacing it with \`content: '"${value}"'\``
        )
      }
    }

    const processed = oldProcessStyleValue(key, value)

    if (
      processed !== '' &&
      !isCustomProperty(key) &&
      key.indexOf('-') !== -1 &&
      hyphenatedCache[key] === undefined
    ) {
      hyphenatedCache[key] = true
      console.error(
        `Using kebab-case for css properties in objects is not supported. Did you mean ${key
          .replace(msPattern, 'ms-')
          .replace(hyphenPattern, (str, char) => char.toUpperCase())}?`
      )
    }

    return processed
  }
}

function handleInterpolation(
  mergedProps: void | Object,
  registered: RegisteredCache | void,
  interpolation: Interpolation
): string | number {
  if (interpolation == null) {
    return ''
  }
  if (interpolation.__emotion_styles !== undefined) {
    if (
      process.env.NODE_ENV !== 'production' &&
      interpolation.toString() === 'NO_COMPONENT_SELECTOR'
    ) {
      throw new Error(
        'Component selectors can only be used in conjunction with @emotion/babel-plugin.'
      )
    }
    return interpolation
  }

  switch (typeof interpolation) {
    case 'boolean': {
      return ''
    }
    case 'object': {
      if (interpolation.anim === 1) {
        cursor = {
          name: interpolation.name,
          styles: interpolation.styles,
          next: cursor
        }

        return interpolation.name
      }
      if (interpolation.styles !== undefined) {
        let next = interpolation.next
        if (next !== undefined) {
          // not the most efficient thing ever but this is a pretty rare case
          // and there will be very few iterations of this generally
          while (next !== undefined) {
            cursor = {
              name: next.name,
              styles: next.styles,
              next: cursor
            }
            next = next.next
          }
        }
        let styles = `${interpolation.styles};`
        if (
          process.env.NODE_ENV !== 'production' &&
          interpolation.map !== undefined
        ) {
          styles += interpolation.map
        }

        return styles
      }

      return createStringFromObject(mergedProps, registered, interpolation)
    }
    case 'function': {
      if (mergedProps !== undefined) {
        let previousCursor = cursor
        let result = interpolation(mergedProps)
        cursor = previousCursor

        return handleInterpolation(mergedProps, registered, result)
      } else if (process.env.NODE_ENV !== 'production') {
        console.error(
          'Functions that are interpolated in css calls will be stringified.\n' +
            'If you want to have a css call based on props, create a function that returns a css call like this\n' +
            'let dynamicStyle = (props) => css`color: ${props.color}`\n' +
            'It can be called directly with props or interpolated in a styled call like this\n' +
            "let SomeComponent = styled('div')`${dynamicStyle}`"
        )
      }
      break
    }
    case 'string':
      if (process.env.NODE_ENV !== 'production') {
        const matched = []
        const replaced = interpolation.replace(
          animationRegex,
          (match, p1, p2) => {
            const fakeVarName = `animation${matched.length}`
            matched.push(
              `const ${fakeVarName} = keyframes\`${p2.replace(
                /^@keyframes animation-\w+/,
                ''
              )}\``
            )
            return `\${${fakeVarName}}`
          }
        )
        if (matched.length) {
          console.error(
            '`keyframes` output got interpolated into plain string, please wrap it with `css`.\n\n' +
              'Instead of doing this:\n\n' +
              [...matched, `\`${replaced}\``].join('\n') +
              '\n\nYou should wrap it with `css` like this:\n\n' +
              `css\`${replaced}\``
          )
        }
      }
      break
  }

  // finalize string values (regular strings and functions interpolated into css calls)
  if (registered == null) {
    return interpolation
  }
  const cached = registered[interpolation]
  return cached !== undefined ? cached : interpolation
}

function createStringFromObject(
  mergedProps: void | Object,
  registered: RegisteredCache | void,
  obj: { [key: string]: Interpolation }
): string {
  let string = ''

  if (Array.isArray(obj)) {
    for (let i = 0; i < obj.length; i++) {
      string += `${handleInterpolation(mergedProps, registered, obj[i])};`
    }
  } else {
    for (let key in obj) {
      let value = obj[key]
      if (typeof value !== 'object') {
        if (registered != null && registered[value] !== undefined) {
          string += `${key}{${registered[value]}}`
        } else if (isProcessableValue(value)) {
          string += `${processStyleName(key)}:${processStyleValue(key, value)};`
        }
      } else {
        if (
          key === 'NO_COMPONENT_SELECTOR' &&
          process.env.NODE_ENV !== 'production'
        ) {
          throw new Error(
            'Component selectors can only be used in conjunction with @emotion/babel-plugin.'
          )
        }
        if (
          Array.isArray(value) &&
          typeof value[0] === 'string' &&
          (registered == null || registered[value[0]] === undefined)
        ) {
          for (let i = 0; i < value.length; i++) {
            if (isProcessableValue(value[i])) {
              string += `${processStyleName(key)}:${processStyleValue(
                key,
                value[i]
              )};`
            }
          }
        } else {
          const interpolated = handleInterpolation(
            mergedProps,
            registered,
            value
          )
          switch (key) {
            case 'animation':
            case 'animationName': {
              string += `${processStyleName(key)}:${interpolated};`
              break
            }
            default: {
              if (
                process.env.NODE_ENV !== 'production' &&
                key === 'undefined'
              ) {
                console.error(UNDEFINED_AS_OBJECT_KEY_ERROR)
              }
              string += `${key}{${interpolated}}`
            }
          }
        }
      }
    }
  }

  return string
}

let labelPattern = /label:\s*([^\s;\n{]+)\s*(;|$)/g

let sourceMapPattern
if (process.env.NODE_ENV !== 'production') {
  sourceMapPattern = /\/\*#\ssourceMappingURL=data:application\/json;\S+\s+\*\//g
}

// this is the cursor for keyframes
// keyframes are stored on the SerializedStyles object as a linked list
let cursor

export const serializeStyles = function(
  args: Array<Interpolation>,
  registered: RegisteredCache | void,
  mergedProps: void | Object
): SerializedStyles {
  if (
    args.length === 1 &&
    typeof args[0] === 'object' &&
    args[0] !== null &&
    args[0].styles !== undefined
  ) {
    return args[0]
  }
  let stringMode = true
  let styles = ''

  cursor = undefined
  let strings = args[0]
  if (strings == null || strings.raw === undefined) {
    stringMode = false
    styles += handleInterpolation(mergedProps, registered, strings)
  } else {
    if (process.env.NODE_ENV !== 'production' && strings[0] === undefined) {
      console.error(ILLEGAL_ESCAPE_SEQUENCE_ERROR)
    }
    styles += strings[0]
  }
  // we start at 1 since we've already handled the first arg
  for (let i = 1; i < args.length; i++) {
    styles += handleInterpolation(mergedProps, registered, args[i])
    if (stringMode) {
      if (process.env.NODE_ENV !== 'production' && strings[i] === undefined) {
        console.error(ILLEGAL_ESCAPE_SEQUENCE_ERROR)
      }
      styles += strings[i]
    }
  }
  let sourceMap

  if (process.env.NODE_ENV !== 'production') {
    styles = styles.replace(sourceMapPattern, match => {
      sourceMap = match
      return ''
    })
  }

  // using a global regex with .exec is stateful so lastIndex has to be reset each time
  labelPattern.lastIndex = 0
  let identifierName = ''

  let match
  // https://esbench.com/bench/5b809c2cf2949800a0f61fb5
  while ((match = labelPattern.exec(styles)) !== null) {
    identifierName +=
      '-' +
      // $FlowFixMe we know it's not null
      match[1]
  }

  let name = hashString(styles) + identifierName

  if (process.env.NODE_ENV !== 'production') {
    // $FlowFixMe SerializedStyles type doesn't have toString property (and we don't want to add it)
    return {
      name,
      styles,
      map: sourceMap,
      next: cursor,
      toString() {
        return "You have tried to stringify object returned from `css` function. It isn't supposed to be used directly (e.g. as value of the `className` prop), but rather handed to emotion so it can handle it (e.g. as value of `css` prop)."
      }
    }
  }
  return {
    name,
    styles,
    next: cursor
  }
}