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/* Copyright (c) 2012 Massachusetts Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef __LIBUTIL_CALCULATOR_H__
#define __LIBUTIL_CALCULATOR_H__
#include <sstream>
#include "model/Model.h"
#include "String.h"
#include "Map.h"
#include "Assert.h"
namespace LibUtil
{
using std::istringstream;
using std::ostringstream;
/*
* program:
* END // END is end-of-input
* expr_list END
*
* expr_list:
* expression SEP expr_list // SEP is semicolon
* expression
* print expression
* print STRING
* print STRING expression
* print STRING expression SEP expr_list
*
*
* expression:
* expression + term
* expression - term
* term
*
* term:
* term / primary
* term * primary
* primary
*
* primary:
* NUMBER
* NAME
* NAME = expression
* NAME string expression // NAME is print
* - primary
* ( expression )
*
* string:
*
**/
class Calculator
{
protected:
enum Token
{
NAME, NAME2, NUMBER, STRING, END,
PLUS = '+', MINUS = '-', MUL = '*', DIV = '/',
SEP = ';', ASSIGN = '=', LP = '(', RP = ')'
};
public:
Calculator();
virtual ~Calculator();
public:
void reset();
void evaluateString(const String& str_,
const std::map<String, String> &config,
DSENT::Model *ms_model,
std::map<std::string, double> &outputs);
protected:
Token getToken(istringstream& ist_);
double prim(istringstream& ist_, bool is_get_,
const std::map<String, String> &config,
DSENT::Model *ms_model);
double term(istringstream& ist_, bool is_get_,
const std::map<String, String> &config,
DSENT::Model *ms_model);
double expr(istringstream& ist_, bool is_get_,
const std::map<String, String> &config,
DSENT::Model *ms_model);
virtual double getEnvVar(
const String& var_name_,
const std::map<String, String> &config,
DSENT::Model *ms_model) const;
protected:
String m_reserved_chars_;
Map<double> m_var_;
Token m_curr_token_;
double m_value_number_;
String m_value_string_;
};
} // namespace LibUtil
#endif // __LIBUTIL_CALCULATOR_H__
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