Function parseSelectors

packages/core/src/stringify.ts:147–187

(selector: string)

 * parseSelectors('&:is(:disabled, [disabled], [data-disabled]), .another') // [':is(:disabled, [disabled], [data-disabled])', '.another']
 */
export function parseSelectors(selector: string): string[] {
  const result = [] as string[]
  let parenCount = 0
  let currentSelector = ''
  let inEscape = false

  for (let i = 0; i < selector.length; i++) {
    const char = selector[i]

    if (char === '\\' && !inEscape) {
      inEscape = true
      currentSelector += char
      continue
    }

    if (inEscape) {
      inEscape = false
      currentSelector += char
      continue
    }

    if (char === '(') {
      parenCount++
    } else if (char === ')') {
      parenCount--
    }

    if (char === ',' && parenCount === 0) {
      result.push(currentSelector.trim())
      currentSelector = ''
    } else {
      currentSelector += char
    }
  }

  if (currentSelector) {
    result.push(currentSelector.trim())
  }

  return result
}

const parentSelectorRegex = /&/g
const descendantSelectorRegex = /[ +>|~]/g