https://www.udemy.com/course/essentials-of-interpretation
https://github.com/DmitrySoshnikov/eva-source
sudo npm install -g syntax-cli
syntax-cli --grammar parser/eva-grammar.bnf --mode LALR1 --parse '42' --tokenize
syntax-cli --grammar parser/eva-grammar.bnf --mode LALR1 --output parser/evaParser.js