wrap LanguageTags type in new AnyOrSome type to support wildcards (#2480)

actix-http/src/header/mod.rs

@@ -55,7 +55,7 @@ pub trait Header: IntoHeaderValue {
     fn name() -> HeaderName;
 
     /// Parse a header
-    fn parse<T: HttpMessage>(msg: &T) -> Result<Self, ParseError>;
+    fn parse<M: HttpMessage>(msg: &M) -> Result<Self, ParseError>;
 }
 
 /// Convert `http::HeaderMap` to our `HeaderMap`.

actix-http/src/header/shared/quality_item.rs

@@ -1,8 +1,7 @@
 use std::{
     cmp,
     convert::{TryFrom, TryInto},
-    fmt,
-    str::{self, FromStr},
+    fmt, str,
 };
 
 use derive_more::{Display, Error};
@@ -83,16 +82,17 @@ impl TryFrom<f32> for Quality {
 /// in [RFC 7231 §5.3.1](https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.1).
 #[derive(Clone, PartialEq, Debug)]
 pub struct QualityItem<T> {
-    /// The actual contents of the field.
+    /// The wrapped contents of the field.
     pub item: T,
+
     /// The quality (client or server preference) for the value.
     pub quality: Quality,
 }
 
 impl<T> QualityItem<T> {
-    /// Creates a new `QualityItem` from an item and a quality.
-    /// The item can be of any type.
-    /// The quality should be a value in the range [0, 1].
+    /// Constructs a new `QualityItem` from an item and a quality value.
+    ///
+    /// The item can be of any type. The quality should be a value in the range [0, 1].
     pub fn new(item: T, quality: Quality) -> QualityItem<T> {
         QualityItem { item, quality }
     }
@@ -116,7 +116,7 @@ impl<T: fmt::Display> fmt::Display for QualityItem<T> {
     }
 }
 
-impl<T: FromStr> FromStr for QualityItem<T> {
+impl<T: str::FromStr> str::FromStr for QualityItem<T> {
     type Err = ParseError;
 
     fn from_str(qitem_str: &str) -> Result<Self, Self::Err> {
@@ -128,6 +128,7 @@ impl<T: FromStr> FromStr for QualityItem<T> {
         let mut raw_item = qitem_str;
         let mut quality = 1f32;
 
+        // TODO: MSRV(1.52): use rsplit_once
         let parts: Vec<_> = qitem_str.rsplitn(2, ';').map(str::trim).collect();
 
         if parts.len() == 2 {

actix-http/src/header/utils.rs

@@ -12,7 +12,8 @@ where
     I: Iterator<Item = &'a HeaderValue> + 'a,
     T: FromStr,
 {
-    let mut result = Vec::new();
+    let size_guess = all.size_hint().1.unwrap_or(2);
+    let mut result = Vec::with_capacity(size_guess);
 
     for h in all {
         let s = h.to_str().map_err(|_| ParseError::Header)?;
@@ -26,6 +27,7 @@ where
                 .filter_map(|x| x.trim().parse().ok()),
         )
     }
+
     Ok(result)
 }
 
@@ -34,10 +36,12 @@ where
 pub fn from_one_raw_str<T: FromStr>(val: Option<&HeaderValue>) -> Result<T, ParseError> {
     if let Some(line) = val {
         let line = line.to_str().map_err(|_| ParseError::Header)?;
+
         if !line.is_empty() {
             return T::from_str(line).or(Err(ParseError::Header));
         }
     }
+
     Err(ParseError::Header)
 }
 
@@ -48,13 +52,16 @@ where
     T: fmt::Display,
 {
     let mut iter = parts.iter();
+
     if let Some(part) = iter.next() {
         fmt::Display::fmt(part, f)?;
     }
+
     for part in iter {
         f.write_str(", ")?;
         fmt::Display::fmt(part, f)?;
     }
+
     Ok(())
 }
 
@@ -65,3 +72,25 @@ pub fn http_percent_encode(f: &mut fmt::Formatter<'_>, bytes: &[u8]) -> fmt::Res
     let encoded = percent_encoding::percent_encode(bytes, HTTP_VALUE);
     fmt::Display::fmt(&encoded, f)
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn comma_delimited_parsing() {
+        let headers = vec![];
+        let res: Vec<usize> = from_comma_delimited(headers.iter()).unwrap();
+        assert_eq!(res, vec![0; 0]);
+
+        let headers = vec![
+            HeaderValue::from_static(""),
+            HeaderValue::from_static(","),
+            HeaderValue::from_static("  "),
+            HeaderValue::from_static("1    ,"),
+            HeaderValue::from_static(""),
+        ];
+        let res: Vec<usize> = from_comma_delimited(headers.iter()).unwrap();
+        assert_eq!(res, vec![1]);
+    }
+}