xso: Fix all clippy warnings

xso/src/lib.rs

@@ -276,9 +276,8 @@ pub fn transform<T: FromXml, F: IntoXml>(from: F) -> Result<T, self::error::Erro
     };
     for event in iter {
         let event = event?;
-        match sink.feed(event)? {
+        if let Some(v) = sink.feed(event)? {
-            Some(v) => return Ok(v),
+            return Ok(v);
-            None => (),
         }
     }
     Err(self::error::Error::XmlError(
@@ -312,9 +311,8 @@ pub fn try_from_element<T: FromXml>(
     iter.next().expect("first event from minidom::Element")?;
     for event in iter {
         let event = event?;
-        match sink.feed(event)? {
+        if let Some(v) = sink.feed(event)? {
-            Some(v) => return Ok(v),
+            return Ok(v);
-            None => (),
         }
     }
     // unreachable! instead of error here, because minidom::Element always
@@ -368,9 +366,8 @@ pub fn from_bytes<T: FromXml>(mut buf: &[u8]) -> Result<T, self::error::Error> {
         Err(self::error::FromEventsError::Invalid(e)) => return Err(e),
     };
     for ev in reader {
-        match builder.feed(map_nonio_error(ev)?)? {
+        if let Some(v) = builder.feed(map_nonio_error(ev)?)? {
-            Some(v) => return Ok(v),
+            return Ok(v);
-            None => (),
         }
     }
     Err(self::error::Error::XmlError(

xso/src/minidom_compat.rs

@@ -96,7 +96,7 @@ impl IntoEventsInner {
                     remaining: el.take_nodes().into_iter(),
                     nested: None,
                 };
-                return Ok(Some(event));
+                Ok(Some(event))
             }
             IntoEventsInner::Nodes {
                 ref mut nested,
@@ -213,7 +213,7 @@ impl FromXml for Element {
         let mut builder = Element::builder(qname.1, qname.0);
         for ((namespace, name), value) in attrs.into_iter() {
             if namespace.is_none() {
-                builder = builder.attr(name, String::from(value));
+                builder = builder.attr(name, value);
             } else {
                 let (is_new, prefix) = prefixes.declare_with_auto_prefix(namespace.clone());
                 let name = prefix.with_suffix(&name);
@@ -225,7 +225,7 @@ impl FromXml for Element {
                         )
                         .unwrap();
                 }
-                builder = builder.attr(name, String::from(value));
+                builder = builder.attr(name, value);
             }
         }
 

xso/src/text.rs

@@ -151,7 +151,7 @@ pub struct EmptyAsNone;
 
 impl TextCodec<Option<String>> for EmptyAsNone {
     fn decode(s: String) -> Result<Option<String>, Error> {
-        if s.len() == 0 {
+        if s.is_empty() {
             Ok(None)
         } else {
             Ok(Some(s))
@@ -160,7 +160,7 @@ impl TextCodec<Option<String>> for EmptyAsNone {
 
     fn encode(value: Option<String>) -> Result<Option<String>, Error> {
         Ok(match value {
-            Some(v) if v.len() > 0 => Some(v),
+            Some(v) if !v.is_empty() => Some(v),
             Some(_) | None => None,
         })
     }
@@ -210,9 +210,9 @@ pub struct Base64<Filter: TextFilter = NoFilter>(PhantomData<Filter>);
 impl<Filter: TextFilter> TextCodec<Vec<u8>> for Base64<Filter> {
     fn decode(s: String) -> Result<Vec<u8>, Error> {
         let value = Filter::preprocess(s);
-        Ok(StandardBase64Engine
+        StandardBase64Engine
-            .decode(value.as_str().as_bytes())
+            .decode(value.as_bytes())
-            .map_err(Error::text_parse_error)?)
+            .map_err(Error::text_parse_error)
     }
 
     fn encode(value: Vec<u8>) -> Result<Option<String>, Error> {
@@ -224,7 +224,7 @@ impl<Filter: TextFilter> TextCodec<Vec<u8>> for Base64<Filter> {
 #[cfg_attr(docsrs, doc(cfg(feature = "base64")))]
 impl<Filter: TextFilter> TextCodec<Option<Vec<u8>>> for Base64<Filter> {
     fn decode(s: String) -> Result<Option<Vec<u8>>, Error> {
-        if s.len() == 0 {
+        if s.is_empty() {
             return Ok(None);
         }
         Ok(Some(Self::decode(s)?))