Function sortClasses

src/sorting.ts:11–93

(
  classStr: string,
  {
    env,
    ignoreFirst = false,
    ignoreLast = false,
    removeDuplicates = true,
    collapseWhitespace = { start: true, end: true },
  }: SortOptions & {
    env: TransformerEnv
  },
)

}

export function sortClasses(
  classStr: string,
  {
    env,
    ignoreFirst = false,
    ignoreLast = false,
    removeDuplicates = true,
    collapseWhitespace = { start: true, end: true },
  }: SortOptions & {
    env: TransformerEnv
  },
): string {
  if (typeof classStr !== 'string' || classStr === '') {
    return classStr
  }

  // Ignore class attributes containing `{{`, to match Prettier behaviour:
  // https://github.com/prettier/prettier/blob/8a88cdce6d4605f206305ebb9204a0cabf96a070/src/language-html/embed/class-names.js#L9
  if (classStr.includes('{{')) {
    return classStr
  }

  if (env.options.tailwindPreserveWhitespace) {
    collapseWhitespace = false
  }

  if (env.options.tailwindPreserveDuplicates) {
    removeDuplicates = false
  }

  // This class list is purely whitespace
  // Collapse it to a single space if the option is enabled
  if (collapseWhitespace && /^[\t\r\f\n ]+$/.test(classStr)) {
    return ' '
  }

  let result = ''
  let parts = classStr.split(/([\t\r\f\n ]+)/)
  let classes = parts.filter((_, i) => i % 2 === 0)
  let whitespace = parts.filter((_, i) => i % 2 !== 0)

  if (classes[classes.length - 1] === '') {
    classes.pop()
  }

  if (collapseWhitespace) {
    whitespace = whitespace.map(() => ' ')
  }

  let prefix = ''
  if (ignoreFirst) {
    prefix = `${classes.shift() ?? ''}${whitespace.shift() ?? ''}`
  }

  let suffix = ''
  if (ignoreLast) {
    suffix = `${whitespace.pop() ?? ''}${classes.pop() ?? ''}`
  }