input: complete_expression
        | scalefactor complete_expression
        | LIT1
        ;

complete_expression: product_of_units
        | product_of_units division unit_expression
        ;

product_of_units: unit_expression
        | product_of_units product unit_expression
        ;

unit_expression: term
        | function_application
        | OPEN_P complete_expression CLOSE_P
        ;

function_application: STRING OPEN_P  function_operand CLOSE_P ;
function_operand: complete_expression
        | scalefactor complete_expression ;

scalefactor: LIT10 power numeric_power
        | LIT10
        | LIT1
        | VOUFLOAT
        ;

division: DIVISION;

term: unit
        | unit power numeric_power
        ;

unit: STRING
        | QUOTED_STRING
        | STRING QUOTED_STRING
        | PERCENT
        ;

power: STARSTAR;

numeric_power: integer
        | parenthesized_number
        ;

parenthesized_number: OPEN_P integer CLOSE_P
        | OPEN_P FLOAT CLOSE_P
        | OPEN_P integer division UNSIGNED_INTEGER CLOSE_P
        ;

integer: SIGNED_INTEGER | UNSIGNED_INTEGER;

product: DOT;
