class Calcula::Expr
All valid tree expression must be childrens of this class and should be placed under the module `Calcula::Exprs`
@see Calcula::Exprs
@abstract @author Paul T.
Public Instance Methods
Returns the child nodes as a list. Child nodes must be transversible (hence also expressions).
@return [Array<Calcula::Expr>] A list of transversible child nodes
# File lib/Expr.rb, line 37 def children [] end
Converts the expression to a string. If the form is `:src`, then the resulting string should resemble as much as its source code as possible. If the form is `:tree`, the result string should resemble in a Lisp like form. If the form is `:ruby`, the result should be Ruby code that does the same thing. Otherwise, `nil` should be returned.
@param form [Optional, Symbol] The type of format being converted into @return [String, nil] A string that resembles the specify form
# File lib/Expr.rb, line 20 def to_s(form: :src) case form when :src then "" when :tree then "()" when :ruby then "" else nil end end