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Add a match_ignore_ascii_case! macro that does not allocate.

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It should replace `match foo.to_ascii_lower().as_slice() { ...}`

@Manishearth I changed map.get to map.find in the lint to work around an ICE:

    task 'rustc' panicked at 'couldn't find node id 0 in the AST map'

Does this look OK?
This commit is contained in:
Simon Sapin 2014-12-21 11:17:53 +00:00
parent 540d218885
commit 2e35d4e987
6 changed files with 34 additions and 12 deletions
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25
components/plugins/lib.rs
View file

@ -65,11 +65,10 @@ macro_rules! define_css_keyword_enum {
impl $name {
pub fn parse(component_value: &::cssparser::ast::ComponentValue) -> Result<$name, ()> {
use std::ascii::AsciiExt;
match component_value {
&::cssparser::ast::Ident(ref value) => {
match value.to_ascii_lower().as_slice() {
$( concat!($css) => Ok($name::$variant), )+
match_ignore_ascii_case! { value:
$( $css => Ok($name::$variant) ),+
_ => Err(())
}
}
@ -96,3 +95,23 @@ macro_rules! define_css_keyword_enum {
}
}
}
#[macro_export]
macro_rules! match_ignore_ascii_case {
( $value: expr: $( $string: expr => $result: expr ),+ _ => $fallback: expr, ) => {
match_ignore_ascii_case! { $value:
$( $string => $result ),+
_ => $fallback
}
};
( $value: expr: $( $string: expr => $result: expr ),+ _ => $fallback: expr ) => {
{
use std::ascii::AsciiExt;
match $value.as_slice() {
$( s if s.eq_ignore_ascii_case($string) => $result, )+
_ => $fallback
}
}
};
}