WHITESPACE = _{ " " | "\t" | "\n" | "\r" }

filters = { filter ~ ("," ~ filters)? }
filter = { filter_name ~ ("(" ~ options ~ ")")? }
filter_name = @{ ASCII_ALPHA ~ (ASCII_ALPHANUMERIC | "_")* }

options = { option ~ ("," ~ options)? }
option = { (option_name ~ "=")? ~ option_value }
option_name = @{ ASCII_ALPHA ~ (ASCII_ALPHANUMERIC | "_")* }

option_value = { 
    JSON_NUMBER |
    JSON_STRING |
    JSON_BOOLEAN
}

JSON_NUMBER = @{ 
    ("-")? ~ 
    ("0" | ASCII_NONZERO_DIGIT ~ ASCII_DIGIT*) ~ 
    ("." ~ ASCII_DIGIT*)? ~ 
    (("e" | "E") ~ ("+" | "-")? ~ ASCII_DIGIT+)? 
}

JSON_STRING = ${ 
    "\"" ~ 
    (("\\" ~ ANY) | (!("\"" | "\\") ~ ANY))* ~ 
    "\"" 
}

JSON_BOOLEAN = ${ "true" | "false" }