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/*
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 1993-2023 Gothel Software e.K.
*
* 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 RPN_CALC_HPP
#define RPN_CALC_HPP
#include <cstdio>
#include <cmath>
#include <cstdint>
#include <cstdlib>
#include <string>
#include <vector>
#include <map>
#include <ostream>
namespace rpn_calc {
enum class RPNStatus : unsigned int {
No_Error,
/*-----------------------*/
Too_Complex,
Unresolved_Variables,
Division_by_zero,
Overflow,
Undefined,
RPN_Underflow,
/*-----------------------*/
};
std::string to_string(RPNStatus status) noexcept;
enum class rpn_token_t : unsigned int {
UREAL, VARIABLE,
SUB, ADD,
MUL, DIV, MOD,
ABS, SIN, COS, TAN, ARCSIN, ARCCOS, ARCTAN,
POW, LOG, LOG10, EXP,
SQRT, NEG
};
std::string to_string(const rpn_token_t ts) noexcept;
struct rpn_token {
/** Terminal Symbol (TOKEN) */
rpn_token_t ts;
/** Real value */
double value;
/** Variable identifier */
std::string id;
};
typedef std::vector<rpn_token> rpn_stack_t;
std::string to_string(const rpn_token& v) noexcept;
std::string to_string(const rpn_stack_t& rpn_expr) noexcept;
// Reduce the given source RPN into destination res RPN
RPNStatus reduce(rpn_stack_t& res, const rpn_stack_t& source) noexcept;
typedef std::map<std::string, double> variable_set;
std::string to_string(const variable_set& variables) noexcept;
struct rpn_expression_t {
rpn_stack_t expr;
void clear() noexcept { expr.clear(); }
void push_back(rpn_token_t ts) {
expr.push_back( { ts, 0.0, "" } );
}
void push_back(double value) {
expr.push_back( { rpn_token_t::UREAL, value, "" } );
}
void push_back(const std::string& variable_name) {
expr.push_back( { rpn_token_t::VARIABLE, 0.0, variable_name } );
}
void push_back(std::string&& variable_name) {
expr.push_back( { rpn_token_t::VARIABLE, 0.0, std::move(variable_name) } );
}
// Reduce this RPN in place
RPNStatus reduce() noexcept {
rpn_stack_t dest;
RPNStatus s = rpn_calc::reduce(dest, expr);
if( RPNStatus::No_Error == s ) {
expr = dest;
}
return s;
}
// Checks whether all variables in RPN are resolved with given variables.
bool resolved(const variable_set& variables) const noexcept;
// Evaluate the given RPN and variables.
RPNStatus eval(double& result, const variable_set& variables) const noexcept;
std::string toString() const noexcept { return to_string(expr); }
};
} // namespace rpn_calc
namespace std {
ostream& operator<<(ostream& os, const rpn_calc::rpn_token_t rpn);
ostream& operator<<(ostream& os, const rpn_calc::rpn_token& rpn);
}
#endif /* RPN_CALC_HPP */
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