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