import { Semicolon, LeftCurlyBracket } from '../../tokenizer/index.js';

export const name = 'AtrulePrelude';
export const walkContext = 'atrulePrelude';
export const structure = {
  children: [[]],
};

export function parse(name) {
  let children = null;

  if (name !== null) {
    name = name.toLowerCase();
  }

  this.skipSC();

  if (
    hasOwnProperty.call(this.atrule, name) &&
    typeof this.atrule[name].prelude === 'function'
  ) {
    // custom consumer
    children = this.atrule[name].prelude.call(this);
  } else {
    // default consumer
    children = this.readSequence(this.scope.AtrulePrelude);
  }

  this.skipSC();

  if (
    this.eof !== true &&
    this.tokenType !== LeftCurlyBracket &&
    this.tokenType !== Semicolon
  ) {
    this.error('Semicolon or block is expected');
  }

  return {
    type: 'AtrulePrelude',
    loc: this.getLocationFromList(children),
    children,
  };
}

export function generate(node) {
  this.children(node);
}