%ignore " "
COMMENT: "#" /[^\n]/*
%ignore COMMENT

SEMICOLON: ";"
END_LINE: "\n"
SEPARATOR: SEMICOLON | END_LINE

ZERO: "0"
POSITIVE_DIGIT: "1".."9"
DIGIT: ZERO | POSITIVE_DIGIT

UPPERCASE_LETTER: "A".."Z"
LOWERCASE_LETTER: "a".."z"
LETTER: UPPERCASE_LETTER | LOWERCASE_LETTER

POSITIVE_INTEGER: POSITIVE_DIGIT DIGIT*
NEGATIVE_INTEGER: "-" POSITIVE_INTEGER
INTEGER: ZERO | POSITIVE_INTEGER | NEGATIVE_INTEGER
DECIMAL: INTEGER "." ZERO* POSITIVE_DIGIT
NUMBER: INTEGER | DECIMAL

PLUS: "+"
MINUS: "-"
MULTIPLE: "*"
DIVIDE: "//"
DIV: "div"

sum_operator: PLUS | MINUS
multiple_operator: MULTIPLE | DIVIDE | DIV
operator: sum_operator | multiple_operator

LOWERCASE_NAME: LOWERCASE_LETTER (LOWERCASE_LETTER | "_")*

const_indent: LOWERCASE_NAME

const_multiplied: const_indent | NUMBER

const_multiple_expression: (const_multiplied multiple_operator)+ const_multiplied
                         | "(" const_multiple_expression ")" multiple_operator const_multiplied
                         | "(" const_multiple_expression ")" multiple_operator const_multiple_expression
                         | const_multiplied multiple_operator "(" const_multiple_expression ")"
                         | const_multiple_expression multiple_operator "(" const_multiple_expression ")"
                         | "(" const_multiple_expression ")" multiple_operator "(" const_multiple_expression ")"

const_addend: NUMBER | const_indent | const_multiple_expression

const_sum_expression: (const_addend sum_operator)+ const_addend
                    | "(" const_sum_expression ")" sum_operator const_addend
                    | "(" const_multiple_expression ")" sum_operator const_addend
                    | const_addend sum_operator "(" const_sum_expression ")"
                    | const_addend sum_operator "(" const_multiple_expression ")"

const_expression: const_multiple_expression
                | const_sum_expression
                | "(" const_expression ")" operator "(" const_expression ")"

const_value: NUMBER | const_indent | const_expression


start: const_value