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muc/user: Simplify Status with a new macro.

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This commit is contained in:
Emmanuel Gil Peyrot 2017-11-24 05:44:58 +00:00
commit 75625c497c
2 changed files with 59 additions and 91 deletions
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38
src/macros.rs
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@ -139,6 +139,44 @@ macro_rules! generate_element_enum {
);
}
macro_rules! generate_attribute_enum {
($(#[$meta:meta])* $elem:ident, $name:tt, $ns:expr, $attr:tt, {$($(#[$enum_meta:meta])* $enum:ident => $enum_name:tt),+,}) => (
generate_attribute_enum!($(#[$meta])* $elem, $name, $ns, $attr, {$($(#[$enum_meta])* $enum => $enum_name),+});
);
($(#[$meta:meta])* $elem:ident, $name:tt, $ns:expr, $attr:tt, {$($(#[$enum_meta:meta])* $enum:ident => $enum_name:tt),+}) => (
$(#[$meta])*
#[derive(Debug, Clone, PartialEq)]
pub enum $elem {
$(
$(#[$enum_meta])*
$enum
),+
}
impl TryFrom<Element> for $elem {
type Err = Error;
fn try_from(elem: Element) -> Result<$elem, Error> {
check_ns_only!(elem, $name, $ns);
check_no_children!(elem, $name);
check_no_unknown_attributes!(elem, $name, [$attr]);
Ok(match get_attr!(elem, $attr, required) {
$($enum_name => $elem::$enum,)+
_ => return Err(Error::ParseError(concat!("Invalid ", $name, " ", $attr, " value."))),
})
}
}
impl From<$elem> for Element {
fn from(elem: $elem) -> Element {
Element::builder($name)
.ns($ns)
.attr($attr, match elem {
$($elem::$enum => $enum_name,)+
})
.build()
}
}
);
}
macro_rules! check_self {
($elem:ident, $name:tt, $ns:expr) => (
check_self!($elem, $name, $ns, $name);