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Add a generate_attribute! macro, and use it for the common case.

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This commit is contained in:
Emmanuel Gil Peyrot 2017-06-14 00:50:57 +01:00
commit 0f297d2d2d
10 changed files with 158 additions and 499 deletions
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60
src/lib.rs
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@ -49,6 +49,66 @@ macro_rules! get_attr {
);
}
macro_rules! generate_attribute {
($elem:ident, $name:tt, {$($a:ident => $b:tt),+,}) => (
generate_attribute!($elem, $name, {$($a => $b),+});
);
($elem:ident, $name:tt, {$($a:ident => $b:tt),+,}, Default = $default:ident) => (
generate_attribute!($elem, $name, {$($a => $b),+}, Default = $default);
);
($elem:ident, $name:tt, {$($a:ident => $b:tt),+}) => (
#[derive(Debug, Clone, PartialEq)]
pub enum $elem {
$($a),+
}
impl FromStr for $elem {
type Err = Error;
fn from_str(s: &str) -> Result<$elem, Error> {
Ok(match s {
$($b => $elem::$a),+,
_ => return Err(Error::ParseError(concat!("Unknown value for '", $name, "' attribute."))),
})
}
}
impl IntoAttributeValue for $elem {
fn into_attribute_value(self) -> Option<String> {
Some(String::from(match self {
$($elem::$a => $b),+
}))
}
}
);
($elem:ident, $name:tt, {$($a:ident => $b:tt),+}, Default = $default:ident) => (
#[derive(Debug, Clone, PartialEq)]
pub enum $elem {
$($a),+
}
impl FromStr for $elem {
type Err = Error;
fn from_str(s: &str) -> Result<$elem, Error> {
Ok(match s {
$($b => $elem::$a),+,
_ => return Err(Error::ParseError(concat!("Unknown value for '", $name, "' attribute."))),
})
}
}
impl IntoAttributeValue for $elem {
#[allow(unreachable_patterns)]
fn into_attribute_value(self) -> Option<String> {
Some(String::from(match self {
$elem::$default => return None,
$($elem::$a => $b),+
}))
}
}
impl Default for $elem {
fn default() -> $elem {
$elem::$default
}
}
);
}
/// Error type returned by every parser on failure.
pub mod error;
/// XML namespace definitions used through XMPP.