1 files changed, 0 insertions, 57 deletions
diff --git a/components/script/dom/bindings/str.rs b/components/script/dom/bindings/str.rs
index 6cb17fae4e3..4e579044491 100644
--- a/components/script/dom/bindings/str.rs
+++ b/components/script/dom/bindings/str.rs
@@ -113,63 +113,6 @@ pub fn is_token(s: &[u8]) -> bool {
     })
 }
 
-/// Returns whether the language is matched, as defined by
-/// [RFC 4647](https://tools.ietf.org/html/rfc4647#section-3.3.2).
-pub fn extended_filtering(tag: &str, range: &str) -> bool {
-    let lang_ranges: Vec<&str> = range.split(',').collect();
-
-    lang_ranges.iter().any(|&lang_range| {
-        // step 1
-        let range_subtags: Vec<&str> = lang_range.split('\x2d').collect();
-        let tag_subtags: Vec<&str> = tag.split('\x2d').collect();
-
-        let mut range_iter = range_subtags.iter();
-        let mut tag_iter = tag_subtags.iter();
-
-        // step 2
-        // Note: [Level-4 spec](https://drafts.csswg.org/selectors/#lang-pseudo) check for wild card
-        if let (Some(range_subtag), Some(tag_subtag)) = (range_iter.next(), tag_iter.next()) {
-            if !(range_subtag.eq_ignore_ascii_case(tag_subtag) || range_subtag.eq_ignore_ascii_case("*")) {
-                return false;
-            }
-        }
-
-        let mut current_tag_subtag = tag_iter.next();
-
-        // step 3
-        for range_subtag in range_iter {
-            // step 3a
-            if range_subtag.eq_ignore_ascii_case("*") {
-                continue;
-            }
-            match current_tag_subtag.clone() {
-                Some(tag_subtag) => {
-                    // step 3c
-                    if range_subtag.eq_ignore_ascii_case(tag_subtag) {
-                        current_tag_subtag = tag_iter.next();
-                        continue;
-                    } else {
-                        // step 3d
-                        if tag_subtag.len() == 1 {
-                            return false;
-                        } else {
-                            // else step 3e - continue with loop
-                            current_tag_subtag = tag_iter.next();
-                            if current_tag_subtag.is_none() {
-                                return false;
-                            }
-                        }
-                    }
-                },
-                // step 3b
-                None => { return false; }
-            }
-        }
-        // step 4
-        true
-    })
-}
-
 
 /// A DOMString.
 ///