A rust math evaluation library, with a stateful context.

As the time of writing this, I am currently working on a "typing math calculator" where instead of using a select set of buttons to get a specific result, you can type your whole math expression and get the result of it.

The issue is, I need a math parser for both of these use cases

• Evaluating the math expressions from user input
• Generate an AST to do syntax highlighting, which is one of the features of my calculator

I already checked existing solutions:

• kalk: Written in rust, but I did not want to wrap my head around yet another library
• libqalculate: Have fun getting that to work with rust, since it's a C++ library (I already tried cxx-rs)
• Other existing rust libraries, but they are all unmaintained, or don't have the feature set I want.

Nothing

• Simple math evaluation using PEMDAS (or however you name them)
• Built-in functions (square-root, cube-root, trig, gcd, etc...)
• Summation and Product notations
• Bit-wise operations
• Variable and function declaration
• Array-wise operations
• Complex numbers
• Calculation of derivatives and integrals
• Support UTF-8/Unicode symbols
• Unit conversions