E is a expression
    ES consists of at least zero expressions splited by at least one Space or Line Feed
    V and V_ are expressions that consist of any char expected # or $ or " or ' or ( or ) or Space or Line Feed
    $V is a expression that is constant
    #V is a expression that is V (NOTICE: Not V's value)
    V(ES) is a expression that receives one value as V's value and returns (ES)'s value:
        V belongs the global space in default
        V and V_ in V(ES) belong the local space
    (ES) is a expression that is calculated in the following way:
        ()'s value is $nil
        (E)'s value is E's value
        (ES E)'s value is the value returned after passing E's value to (ES)'s value ((ES) will be calculated ahead of E)
    $(ES) is a expression that is a tuple:
        $(ES)'s value consists the value of each expression in ES (Exressions in ES will calculated from left to right one by one)
        
    #(ES) is a expression that calculated in the following way:
        #(ES)'s value is (ES) (NOTICE: Not (ES)'s value)