code: function getUri() {
    const startPos = pos;
    const type = NodeType.UriType;
    const token = tokens[startPos];
    const line = token.ln;
    const column = token.col;
    let content = [];
    let end;
  
    const uriType = tokens[startPos].uriType;
  
    // Skip `url` and `(`.
    pos += 2;
  
    if (uriType === 1) content = content.concat(getUri1());
    else if (uriType === 2) content = content.concat(getUri2());
    else end = getLastPosition(content, line, column, 4);
  
    if (!end) end = getLastPosition(content, line, column, 1);
  
    // Skip `)`.
    pos++;
  
    return newNode(type, content, line, column, end);
  }
docs: Get specific type of URI node
  @return {Node} Specific type of URI node