arithmetic_operate.h
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/*
* Copyright 2002-2014 the original author or authors.
*
* Licensed 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
*
* CC/LICENSE
*
* 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 _ARITHMETIC_OPERATE_H_
#define _ARITHMETIC_OPERATE_H_
#include <vector>
#include <map>
#include <string>
#include "common.h"
/**
* @brief 表达式计算
*
*/
class ArithmeticOperate {
private:
typedef std::vector<std::pair<int32_t, double> > token_seq_t;
public:
/**
* @brief 构造函数
*
* @see
* @note
* @author chenyuzhen
* @date 2011/08/24 17:34:22
**/
ArithmeticOperate();
/**
* @brief 析构函数
*
* @see
* @note
* @author chenyuzhen
* @date 2011/08/24 17:34:25
**/
~ArithmeticOperate();
/**
* @brief 表达式计算
*
* @param [in/out] str : const char*
* @param [in/out] num : int32_t&
* @return bool
* @retval
* @see
* @note
* @author chenyuzhen
* @date 2011/08/24 17:34:29
**/
bool calculate(const char* str, int32_t& num);//表达式计算
private:
/**
* @brief 将表达式转化为token列表
*
* @param [in/out] input : const std::string&
* @param [in/out] tokens : token_seq_t&
* @return bool
* @retval
* @see
* @note
* @author chenyuzhen
* @date 2011/08/24 17:33:32
**/
bool tokenize(const std::string& input, token_seq_t& tokens);
/**
* @brief 按照token进行计算
*
* @param [in/out] tokens : token_seq_t&
* @param [in/out] val : double&
* @return bool
* @retval
* @see
* @note
* @author chenyuzhen
* @date 2011/08/24 17:33:44
**/
bool calculate_tokens(token_seq_t& tokens, double& val);
private:
std::map<std::string, int32_t> _operator_map; ///<计算符号列表
};
#endif