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Support trailing comma in arg_enum! fields

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This commit is contained in:
Eduardo Pinho 2017-12-07 00:53:55 +00:00
parent f38cb1dbb7
commit dde7fcf1ca
2 changed files with 38 additions and 1 deletions
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27
src/macros.rs
View file

@ -345,6 +345,14 @@ macro_rules! arg_enum {
}
});
};
($(#[$($m:meta),+])+ pub enum $e:ident { $($v:ident $(=$val:expr)*,)+ } ) => {
arg_enum!(@impls
($(#[$($m),+])+
pub enum $e {
$($v$(=$val)*),+
}) -> ($e, $($v),+)
);
};
($(#[$($m:meta),+])+ pub enum $e:ident { $($v:ident $(=$val:expr)*),+ } ) => {
arg_enum!(@impls
($(#[$($m),+])+
@ -353,7 +361,14 @@ macro_rules! arg_enum {
}) -> ($e, $($v),+)
);
};
($(#[$($m:meta),+])+ enum $e:ident { $($v:ident $(=$val:expr)*),+ } ) => {
($(#[$($m:meta),+])+ enum $e:ident { $($v:ident $(=$val:expr)*,)+ } ) => {
arg_enum!($(#[$($m:meta),+])+
enum $e:ident {
$($v:ident $(=$val:expr)*),+
}
);
};
($(#[$($m:meta),+])+ enum $e:ident { $($v:ident $(=$val:expr)*),+ } ) => {
arg_enum!(@impls
($(#[$($m),+])+
enum $e {
@ -361,6 +376,11 @@ macro_rules! arg_enum {
}) -> ($e, $($v),+)
);
};
(pub enum $e:ident { $($v:ident $(=$val:expr)*,)+ } ) => {
arg_enum!(pub enum $e:ident {
$($v:ident $(=$val:expr)*),+
});
};
(pub enum $e:ident { $($v:ident $(=$val:expr)*),+ } ) => {
arg_enum!(@impls
(pub enum $e {
@ -368,6 +388,11 @@ macro_rules! arg_enum {
}) -> ($e, $($v),+)
);
};
(enum $e:ident { $($v:ident $(=$val:expr)*,)+ } ) => {
arg_enum!(enum $e:ident {
$($v:ident $(=$val:expr)*),+
});
};
(enum $e:ident { $($v:ident $(=$val:expr)*),+ } ) => {
arg_enum!(@impls
(enum $e {

12
tests/macros.rs
View file

@ -159,3 +159,15 @@ fn arg_enum() {
}
assert_eq!("Alpha".parse::<Greek>(), Ok(Greek::Alpha));
}
#[test]
fn arg_enum_trailing_comma() {
arg_enum!{
#[derive(Debug, PartialEq, Copy, Clone)]
pub enum Greek {
Alpha,
Bravo,
}
}
assert_eq!("Alpha".parse::<Greek>(), Ok(Greek::Alpha));
}