code: function initAppMediaQueryToken(ctx, buffer, separator) {
      let currToken = buffer.trim();
      let {tokens} = ctx;
      if (currToken) {
          if (initAppMediaTargetInfo(ctx, currToken)) {
              return true;
          }
  
          tokens.push(buffer);
          tokens.push(separator);
  
          return '';
      }
  
      buffer += separator;
      if (buffer.trim()) {
          tokens.push(buffer);
          return '';
      }
      return buffer;
  }
docs: Initialize the app media query tokens.
  Return the new cache token string or true, if return true, meaning that
  it should stop parse tokens.
  
  @param {Object} ctx the parse context
  @param {string} buffer the current collect token string
  @param {string} separator the current separator that is encountered
  @return {boolean|string}