text: /*
  Language: Backus–Naur Form
  Website: https://en.wikipedia.org/wiki/Backus–Naur_form
  Author: Oleg Efimov <efimovov@gmail.com>
  */
  
  /** @type LanguageFn */
  function bnf(hljs) {
    return {
      name: 'Backus–Naur Form',
      contains: [
        // Attribute
        {
          className: 'attribute',
          begin: /</,
          end: />/
        },
        // Specific
        {
          begin: /::=/,
          end: /$/,
          contains: [
            {
              begin: /</,
              end: />/
            },
            // Common
            hljs.C_LINE_COMMENT_MODE,
            hljs.C_BLOCK_COMMENT_MODE,
            hljs.APOS_STRING_MODE,
            hljs.QUOTE_STRING_MODE
          ]
        }
      ]
    };
  }
  
  module.exports = bnf;
  