schema_types.rs

macro_rules! code_value {
    (
        $NAME:ident {
            $(
                $( $IN:pat )|+ => $VARIANT:ident => $OUT:expr
            ),*
        }
    ) => (
        #[derive(Clone, Copy, Debug)]
        pub enum $NAME {
            $($VARIANT,)*
        }

        impl CodeValue for $NAME {
        	fn value(&self) -> &str {
        		match *self {
        		    $(
        		        $NAME::$VARIANT => $OUT,
        		    )*
        		}
        	}

        	fn from(value: &str) -> Option<$NAME> {
        		match value {
        		    $(
        		        $(
        		            $IN
        		        )|+ => Some($NAME::$VARIANT),
        		    )*
        		}
        	}
        }
    );

	(
        $NAME:ident {
            $(
                $( $IN:pat )|+ => $VARIANT:ident => $OUT:expr
            ),*
        }: $DEFAULT:ident
    ) => (
        #[derive(Clone, Copy, Debug)]
        pub enum $NAME {
            $($VARIANT,)*
        }

        impl CodeValue for $NAME {
        	fn value(&self) -> &str {
        		match *self {
        		    $(
        		        $NAME::$VARIANT => $OUT,
        		    )*
        		}
        	}

        	fn from(value: &str) -> Option<$NAME> {
        		match value {
        		    $(
        		        $(
        		            $IN
        		        )|+ => Some($NAME::$VARIANT),
        		    )*
        		}
        	}
        }

		impl Default for $NAME {
			fn default() -> $NAME { $NAME::$DEFAULT }
		}
    );

	(
        $NAME:ident {
            $(
                $VARIANT:ident <=> $VAL:expr
            ),*
        }
    ) => (
        #[derive(Clone, Copy, Debug)]
        pub enum $NAME {
            $($VARIANT,)*
        }

        impl CodeValue for $NAME {
        	fn value(&self) -> &str {
        		match *self {
        		    $(
        		        $NAME::$VARIANT => $VAL,
        		    )*
        		}
        	}

        	fn from(value: &str) -> Option<$NAME> {
        		match value {
        		    $(
        		        $VAL => Some($NAME::$VARIANT)
        		    ),*,
					_ => None
        		}
        	}
        }
    );
}