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ImHex/plugins/builtin/include/math_evaluator.hpp

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#pragma once
#include <hex.hpp>
#include <string>
#include <vector>
#include <queue>
#include <unordered_map>
#include <functional>
#include <optional>
namespace hex {
enum class TokenType {
Number,
Variable,
Function,
Operator,
Bracket
};
enum class Operator : u16 {
Invalid = 0x000,
Assign = 0x010,
Or = 0x020,
Xor = 0x030,
And = 0x040,
BitwiseOr = 0x050,
BitwiseXor = 0x060,
BitwiseAnd = 0x070,
Equals = 0x080,
NotEquals = 0x081,
GreaterThan = 0x090,
LessThan = 0x091,
GreaterThanOrEquals = 0x092,
LessThanOrEquals = 0x093,
ShiftLeft = 0x0A0,
ShiftRight = 0x0A1,
Addition = 0x0B0,
Subtraction = 0x0B1,
Multiplication = 0x0C0,
Division = 0x0C1,
Modulus = 0x0C2,
Exponentiation = 0x1D0,
Combine = 0x0E0,
BitwiseNot = 0x0F0,
Not = 0x0F1
};
enum class BracketType : std::uint8_t {
Left,
Right
};
struct Token {
TokenType type;
long double number;
Operator op;
BracketType bracketType;
std::string name;
std::vector<long double> arguments;
};
class MathEvaluator {
public:
MathEvaluator() = default;
std::optional<long double> evaluate(std::string input);
void registerStandardVariables();
void registerStandardFunctions();
void setVariable(std::string name, long double value);
void setFunction(std::string name, std::function<std::optional<long double>(std::vector<long double>)> function, size_t minNumArgs, size_t maxNumArgs);
std::unordered_map<std::string, long double>& getVariables() { return this->m_variables; }
private:
std::queue<Token> parseInput(const char *input);
std::queue<Token> toPostfix(std::queue<Token> inputQueue);
std::optional<long double> evaluate(std::queue<Token> postfixTokens);
std::unordered_map<std::string, long double> m_variables;
std::unordered_map<std::string, std::function<std::optional<long double>(std::vector<long double>)>> m_functions;
};
}