Math lexer/parser/evaluator

A highly customizable and easy to use math expression lexer/parser/evaluator

Features

• Comprehensible error system with originating token
• Customizable math context
  • Custom token types
  • Custom constants
  • Custom functions
  • Custom operators
• Token constructors and validators aware of surrounding tokens in lexer
• Parser to Reverse Polish Notation
• Parser to compute tree
• Simple to use recursively-based evaluator

Getting started

Add this package to your Dart/Flutter project via

dart pub add math_parser

or

flutter pub add math_parser

Usage

You can find samples in the example page.

To compute an expression, simply put it in the "compute" function:

final result = compute('2 + 2');
print(result); // 4

Additional information

If I was able to write this package myself it is thanks to Thorsten Ball's "Writing an interpreter in Go". I recommend this book for any projects like this.