grammar_definition = """

start: expr

expr: term | expr OR term

term: factor | term AND factor

factor: compare_expr

?quoted_string : DOUBLE_QUOTED_STRING | SINGLE_QUOTED_STRING

compare_expr: (NAME | array | quoted_string) COMPARE_OP (NAME | array | quoted_string)

VALUE: NUMBER | CNAME | SINGLE_QUOTED_STRING | DOUBLE_QUOTED_STRING

COMPARE_OP: "!=" | ">=" | "<=" | ">" | "<" | "=" | "in"

OR: "or"

AND: "and"

NAME: CNAME [DOT CNAME]+ | CNAME | NUMBER

array: "[" [VALUE ("," VALUE)*] "]"

DOT: "."

AMPERSAND: "&"

CNAME: ("_"|LETTER|"&"|"?") ("_"|LETTER|DIGIT|"&"|"?")*

DOUBLE_QUOTED_STRING : /"[^"]*"/

SINGLE_QUOTED_STRING : /'[^']*'/

%import common.NUMBER

%import common.LETTER

%import common.DIGIT

%import common.NEWLINE

%ignore NEWLINE

_WHITESPACE: /[ \t]+/

%ignore _WHITESPACE

"""