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script: Move extended_filtering to the style crate.
We'll need to call it from the style crate in later patches, when matching :lang() against element snapshots.
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4 changed files with 69 additions and 64 deletions
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@ -113,63 +113,6 @@ pub fn is_token(s: &[u8]) -> bool {
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})
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}
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/// Returns whether the language is matched, as defined by
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/// [RFC 4647](https://tools.ietf.org/html/rfc4647#section-3.3.2).
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pub fn extended_filtering(tag: &str, range: &str) -> bool {
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let lang_ranges: Vec<&str> = range.split(',').collect();
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lang_ranges.iter().any(|&lang_range| {
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// step 1
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let range_subtags: Vec<&str> = lang_range.split('\x2d').collect();
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let tag_subtags: Vec<&str> = tag.split('\x2d').collect();
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let mut range_iter = range_subtags.iter();
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let mut tag_iter = tag_subtags.iter();
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// step 2
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// Note: [Level-4 spec](https://drafts.csswg.org/selectors/#lang-pseudo) check for wild card
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if let (Some(range_subtag), Some(tag_subtag)) = (range_iter.next(), tag_iter.next()) {
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if !(range_subtag.eq_ignore_ascii_case(tag_subtag) || range_subtag.eq_ignore_ascii_case("*")) {
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return false;
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}
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}
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let mut current_tag_subtag = tag_iter.next();
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// step 3
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for range_subtag in range_iter {
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// step 3a
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if range_subtag.eq_ignore_ascii_case("*") {
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continue;
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}
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match current_tag_subtag.clone() {
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Some(tag_subtag) => {
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// step 3c
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if range_subtag.eq_ignore_ascii_case(tag_subtag) {
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current_tag_subtag = tag_iter.next();
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continue;
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} else {
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// step 3d
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if tag_subtag.len() == 1 {
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return false;
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} else {
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// else step 3e - continue with loop
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current_tag_subtag = tag_iter.next();
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if current_tag_subtag.is_none() {
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return false;
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}
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}
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}
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},
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// step 3b
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None => { return false; }
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}
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}
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// step 4
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true
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})
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}
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/// A DOMString.
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///
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