| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| **/ |
| |
| #ifndef QUICKSTEP_CLI_LINE_READER_HPP_ |
| #define QUICKSTEP_CLI_LINE_READER_HPP_ |
| |
| #include <string> |
| |
| #include "utility/Macros.hpp" |
| |
| namespace quickstep { |
| |
| /** \addtogroup CLI |
| * @{ |
| */ |
| |
| /** |
| * @brief An interface for reading user input from command lines. |
| **/ |
| class LineReader { |
| public: |
| /** |
| * @brief Constructor. |
| * |
| * @param default_prompt The default command prompt. |
| * @param continue_prompt The prompt given when a command extends over more |
| * than one line. |
| **/ |
| LineReader(const std::string &default_prompt, |
| const std::string &continue_prompt) |
| : default_prompt_(default_prompt), continue_prompt_(continue_prompt) { |
| } |
| |
| /** |
| * @brief Virtual destructor. |
| **/ |
| virtual ~LineReader() { |
| } |
| |
| /** |
| * @brief Obtain the next full SQL command from user input. |
| * |
| * @return The next user-inputted command. |
| **/ |
| std::string getNextCommand(); |
| |
| protected: |
| /** |
| * @brief Get the next newline-terminated line from input. |
| * |
| * @param continuing True if continuing a command from a previous line, false |
| * otherwise. |
| * @return The next line of input. |
| **/ |
| virtual std::string getLineInternal(const bool continuing) = 0; |
| |
| const std::string default_prompt_; |
| const std::string continue_prompt_; |
| std::string leftover_; |
| |
| private: |
| enum LineState { |
| kNormal, |
| kSingleQuote, |
| kSingleQuoteWithEscape, |
| kDoubleQuote, |
| kDoubleQuoteWithEscape, |
| kComment, |
| kCommand |
| }; |
| |
| bool getMoreInput(std::string *input_buffer, bool *continuing); |
| |
| DISALLOW_COPY_AND_ASSIGN(LineReader); |
| }; |
| |
| /** @} */ |
| |
| } // namespace quickstep |
| |
| #endif // QUICKSTEP_CLI_LINE_READER_HPP_ |