module Dentaku
class Dentaku::BinaryOperation
class Dentaku::Calculator
class Dentaku::DependencyResolver
class Dentaku::Evaluator
class Dentaku::Expression
class Dentaku::Rules
class Dentaku::Token
class Dentaku::TokenMatcher
class Dentaku::TokenScanner
class Dentaku::Tokenizer
class Dentaku::UnboundVariableError
class ExternalFunction
dentaku
1.2.2
# subtract
def subtract; [:numeric, left - right]; end