Rubyで80行くらいのインタプリタ(コンパイラ?)作った - Qiita

class Interpreter def calc(code) create_tokens(code) exec(stmt) end private def create_tokens(code) @tokens = [] while !code.empty? arr = [ [/^[0-9]+(\.[0-9]+)?/, "num"], [/^[\+\-\*\/]/, "bin"], [/^[()]/, "bra"], [/^\;/, "semicolon"], ] token = arr.map { |(regex, type)| val = code[regex] { type: type, val: val } if !val.nil? }.compact.first if token.nil? code.slice!(0) else @tokens << token code.s