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import type { cheerio } from '../deps.ts'import type {  Section,  Qualifier,  AttributeQualifier,  Capture,} from '../parser/mod.ts'
import invariant from './invariant.ts'import { msg } from './check.ts'
/** Generator standard css selector according to temme sections. */export function makeNormalCssSelector(sections: Section[]) {  const result: string[] = []  for (const section of sections) {    result.push(section.combinator)    result.push(section.element)    for (const qualifier of section.qualifiers) {      if (qualifier.type === 'id-qualifier') {        result.push(`#${qualifier.id}`)      } else if (qualifier.type === 'class-qualifier') {        result.push(`.${qualifier.className}`)      } else if (qualifier.type === 'attribute-qualifier') {        const { attribute, operator, value } = qualifier        if (operator == null && value == null) {          // existence          result.push(`[${attribute}]`)        } else if (isCapture(value)) {          // Here we does not handle captures, but simply check if the operator is `=`          invariant(operator === '=', msg.valueCaptureWithOtherOperator())        } else {          // Normal css attribute qualifier          result.push(`[${attribute}${operator}"${value}"]`)        }      } else {        // pseudo-qualifier        const { name, content } = qualifier        if (content) {          result.push(`:${name}(${content})`)        } else {          result.push(`:${name}`)        }      }    }  }  return result.join('').trim()}
export function isEmptyObject(x: any) {  return (    x !== null &&    typeof x === 'object' &&    Object.getPrototypeOf(x) === Object.prototype &&    Object.keys(x).length === 0  )}
export function isCheerioStatic(  arg: cheerio.CheerioAPI | cheerio.Element,): arg is cheerio.CheerioAPI {  return typeof (<cheerio.CheerioAPI>arg).root === 'function'}
export function isAttributeQualifier(  qualifier: Qualifier,): qualifier is AttributeQualifier {  return qualifier.type === 'attribute-qualifier'}
export function isCapture(x: any): x is Capture {  return (    x != null &&    typeof x === 'object' &&    typeof x.name === 'string' &&    Array.isArray(x.filterList)  )}
export function last<T>(arr: T[]): T {  return arr[arr.length - 1]}