Macro dot_generator::attr

macro_rules! attr {
    ($ik:ident $k:expr,$iv:ident $v:expr) => { ... };
    ($ik:ident $k:expr,$v:expr) => { ... };
    ($k:expr, $iv:ident $v:expr) => { ... };
    ($k:expr,$v:expr) => { ... };
}

represents an attribute in dot lang.

Example:

    fn attr_test() {
        use dot_generator::*;
        use dot_structures::*;

        assert_eq!(attr!("a","1"), Attribute(id!("a"), id!("1")));
        assert_eq!(attr!(html "a","1"), Attribute(id!(html "a"), id!("1")))
    }