FishCalc

This small calculator (<1MB) comes with a custom interpreter that :

• highlight functions, keywords, constants and parenthesis while typing
• allow to use variables
• loaded scripts
• handle conversions (for now, rad and deg)
• handle logic tests
• give the user helpful error messages

The scanner and parser are fully elaborated on the online book Crafting Interpreters by Bob Nystrom, but made easier (classes and scopes are not really required for a calculator)

The UI is built with PyQt5.

Requirements

PyQt5 >= 5.13.0

Usage

Simply type in an expression for it to evaluate. You can also :

• load a script in any text format. Newline ends the statements.
• mute the result of an expression with ;
• use the built in constants (c, kb, h, pi...)
• use the built in functions (cos, log, sqrt...)
• use ans which is the last calculation result
• represent numbers as 1e-3 or 10^3
• convert an angle to degrees or radians : cos(pi) -> deg

TODO

• more conversion options (physical units...)
• save history and improve loaded scripts usage