| /** |
| * 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_PARSER_PARSE_EXPRESSION_HPP_ |
| #define QUICKSTEP_PARSER_PARSE_EXPRESSION_HPP_ |
| |
| #include <string> |
| |
| #include "parser/ParseTreeNode.hpp" |
| #include "utility/Macros.hpp" |
| |
| namespace quickstep { |
| |
| /** \addtogroup Parser |
| * @{ |
| */ |
| |
| /** |
| * @brief The parsed representation of an expression. |
| **/ |
| class ParseExpression : public ParseTreeNode { |
| public: |
| enum ExpressionType { |
| kAttribute, |
| kBinaryExpression, |
| kExtract, |
| kFunctionCall, |
| kScalarLiteral, |
| kSearchedCaseExpression, |
| kSimpleCaseExpression, |
| kSubqueryExpression, |
| kSubstring, |
| kUnaryExpression, |
| }; |
| |
| /** |
| * @brief Virtual destructor. |
| **/ |
| ~ParseExpression() override { |
| } |
| |
| /** |
| * @return The expression type. |
| */ |
| virtual ExpressionType getExpressionType() const = 0; |
| |
| /** |
| * @brief Get a human-readable representation of this expression. |
| * |
| * @return The human-readable form of this expression. |
| **/ |
| virtual std::string generateName() const = 0; |
| |
| protected: |
| ParseExpression(const int line_number, const int column_number) |
| : ParseTreeNode(line_number, column_number) { |
| } |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(ParseExpression); |
| }; |
| |
| |
| } // namespace quickstep |
| |
| #endif /* QUICKSTEP_PARSER_PARSE_EXPRESSION_HPP_ */ |