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Allow deriving Parse for keywords.

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Emilio Cobos Álvarez 2017-11-12 05:43:53 +01:00
parent da3dd05ff9
commit 7036cb0077
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5 changed files with 126 additions and 38 deletions
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37
components/style_derive/to_css.rs
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@ -16,7 +16,7 @@ pub fn derive(input: DeriveInput) -> Tokens {
let input_attrs = cg::parse_input_attrs::<CssInputAttrs>(&input);
let style = synstructure::BindStyle::Ref.into();
let match_body = synstructure::each_variant(&input, &style, |bindings, variant| {
let mut identifier = to_css_identifier(variant.ident.as_ref());
let mut identifier = cg::to_css_identifier(variant.ident.as_ref());
let variant_attrs = cg::parse_variant_attrs::<CssVariantAttrs>(variant);
let separator = if variant_attrs.comma { ", " } else { " " };
@ -118,38 +118,3 @@ struct CssVariantAttrs {
comma: bool,
dimension: bool,
}
/// Transforms "FooBar" to "foo-bar".
///
/// If the first Camel segment is "Moz" or "Webkit", the result string
/// is prepended with "-".
fn to_css_identifier(mut camel_case: &str) -> String {
camel_case = camel_case.trim_right_matches('_');
let mut first = true;
let mut result = String::with_capacity(camel_case.len());
while let Some(segment) = split_camel_segment(&mut camel_case) {
if first {
match segment {
"Moz" | "Webkit" => first = false,
_ => {},
}
}
if !first {
result.push_str("-");
}
first = false;
result.push_str(&segment.to_lowercase());
}
result
}
/// Given "FooBar", returns "Foo" and sets `camel_case` to "Bar".
fn split_camel_segment<'input>(camel_case: &mut &'input str) -> Option<&'input str> {
let index = camel_case.chars().next()?.len_utf8();
let end_position = camel_case[index..]
.find(char::is_uppercase)
.map_or(camel_case.len(), |pos| index + pos);
let result = &camel_case[..end_position];
*camel_case = &camel_case[end_position..];
Some(result)
}