Macro query

macro_rules! query {
    ($col:tt == $val:expr) => { ... };
    ($col:tt != $val:expr) => { ... };
    ($col:tt > $val:expr) => { ... };
    ($col:tt < $val:expr) => { ... };
    ($col:tt >= $val:expr) => { ... };
    ($col:tt <= $val:expr) => { ... };
    ($left:tt & $right:tt) => { ... };
    ($left:tt | $right:tt) => { ... };
    ( ( $($inner:tt)+ ) ) => { ... };
}

Macro to allow writing queries with a natural syntax. Example: let expr = q!(“name” == “Org X”) | q!(“category” != “Finance”) & q!(“property” > 5);