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// Copyright (C) 2018 Intel Corporation
//
// SPDX-License-Identifier: Apache-2.0
//
#pragma once
#include <set>
#include <map>
#include <vector>
#include <functional>
#include <string>
#include <utility>
/*
* Simple integer arithmetics to be used for the work sizes calculation
* Supported ops: +,-,*,/,%,(,)
* * no unary -,+
* Variables defined as single chars and should not include one of the ops, whitespaces or 0-9
*/
class SimpleMathExpression {
public:
SimpleMathExpression() :m_parsed(false) {}
void SetVariables(const std::map<char, int>& vars);
bool SetExpression(const std::string& expression);
bool IsParsed()const { return m_parsed; }
int Evaluate()const; // undefined behavior if not parsed properly
private:
std::map<char, int> m_variables;
std::string m_expression;
bool m_parsed;
bool Parse();
struct Token {
enum TokenType {
Value,
Operator,
} type;
int value;
char op;
explicit Token(TokenType t = Value, int v = 0, char o = 0) :type(t), value(v), op(o) {}
};
std::vector<Token> m_parsedTokens;
static const std::set<char> whitespaces;
using Operator = std::pair<int, std::function<int(int, int)>>; // priority, function
static const std::map<char, Operator> operators;
};
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