Function nestedAtQuery

src/compiler/style/css-parser/parse-css.ts:331–347

(name: 'media' | 'container' | 'supports')

   * Parse nested @ rule that contains declarations instead of rules
   */
  const nestedAtQuery = (name: 'media' | 'container' | 'supports') => {
    const pos = position();
    const regex = new RegExp('^@' + name + ' *([^{]+)');
    const m = match(regex);

    if (!m) return null;
    const media = trim(m[1]);

    const decls = declarations();
    if (!decls) return null;

    return pos({
      type: name === 'media' ? CssNodeType.Media : name === 'container' ? CssNodeType.Container : CssNodeType.Supports,
      media: media,
      declarations: decls,
    });
  };

  /**
   * Try to parse a nested at-rule (one that contains declarations, not rules)