| /* |
| * 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 _IGNITE_ODBC_SQL_SQL_LEXER |
| #define _IGNITE_ODBC_SQL_SQL_LEXER |
| |
| #include <stdint.h> |
| #include <string> |
| |
| #include <ignite/odbc/odbc_error.h> |
| #include <ignite/odbc/sql/sql_token.h> |
| |
| namespace ignite |
| { |
| namespace odbc |
| { |
| /** |
| * SQL lexer. |
| */ |
| class SqlLexer |
| { |
| public: |
| /** |
| * Constructor. |
| * |
| * @param sql SQL string. |
| */ |
| SqlLexer(const std::string& sql); |
| |
| /** |
| * Destructor. |
| */ |
| ~SqlLexer(); |
| |
| /** |
| * Move to the next token. |
| * |
| * @return @c true if next token was found and @c false otherwise. |
| */ |
| OdbcExpected<bool> Shift(); |
| |
| /** |
| * Check that the following token is the expected one. |
| * Shifts to next token if possible. |
| * |
| * @param typ Token type. |
| * @param expected Expected token. Should be lowercase. |
| * @return @c true if the next token is expected and @c false otherwise. |
| */ |
| bool ExpectNextToken(TokenType::Type typ, const char* expected); |
| |
| /** |
| * Check if the end of data reached. |
| * |
| * @return @c true if the end of data reached. |
| */ |
| bool IsEod() const; |
| |
| /** |
| * Get current token. |
| * |
| * @return Current token. |
| */ |
| const SqlToken& GetCurrentToken() const |
| { |
| return currentToken; |
| } |
| |
| private: |
| /** |
| * Set end of data state. |
| */ |
| void SetEod(); |
| |
| /** |
| * Have enough data. |
| * |
| * @param num Number of chars we need. |
| * @return @c true if we have and false otherwise. |
| */ |
| bool HaveData(int32_t num) const; |
| |
| /** |
| * Check if the char is delimiter. |
| * |
| * @param c Character |
| * @return True if the character is delimiter. |
| */ |
| static bool IsDelimiter(int c); |
| |
| /** SQL string. */ |
| const std::string& sql; |
| |
| /** Current lexer position in string. */ |
| int32_t pos; |
| |
| /** Current token. */ |
| SqlToken currentToken; |
| }; |
| } |
| } |
| |
| #endif //_IGNITE_ODBC_SQL_SQL_LEXER |