Welcome to the Saturn Eval!

Saturn Eval is a simple calculator. It supports common operations like addition, subtraction, multiplication, whole, modulo and common division and exponentiation. Also, it supports functions like sin(pi) and pow(3, 2).

How to compile

chmod +x compile.sh
./compile.sh REPL.cpp

warning: requires C++20. (use 11 version of g++ or 13 of clang).

Usage

1. include eval.hpp
2. Create an environment:

map<string, Eval::Function *> functions;
map<string, double> variables;
// ...

3. Create an instance of the interpreter:

auto interpreter = new Eval::Interpreter(variables, functions);

4. Usage: interpreter.eval(expression).

Catch errors

Eval::Interpreter::eval throws Eval::Error. He has five types (type specified in Eval::Error::type):

• UnexpectedToken: unexpected token, he specified in field token.
• IsNotAFunction: trying to call function, whose name not know to the interpreter (her name specified in field token).
• IsNotDefined: trying to get value of variable, whose name not know to the interpreter (her name specified in field token).
• TooManyArgs: trying to call function, with extra arguments (func name specified in field token).
• TooFewArgs: trying to call function without required amount of arguments (func name specified in field token).

Also Eval::Error contains index on which the error occured.