Use Cow<str> for EscapedDeserializer

Author: dralley

src/de/escape.rs

@@ -17,13 +17,13 @@ use std::borrow::Cow;
 #[derive(Clone, Debug)]
 pub struct EscapedDeserializer<'a> {
     /// Possible escaped value of text/CDATA or attribute value
-    escaped_value: Cow<'a, [u8]>,
+    escaped_value: Cow<'a, str>,
     /// If `true`, value requires unescaping before using
     escaped: bool,
 }
 
 impl<'a> EscapedDeserializer<'a> {
-    pub fn new(escaped_value: Cow<'a, [u8]>, escaped: bool) -> Self {
+    pub fn new(escaped_value: Cow<'a, str>, escaped: bool) -> Self {
         EscapedDeserializer {
             escaped_value,
             escaped,
@@ -37,7 +37,7 @@ macro_rules! deserialize_num {
         where
             V: Visitor<'de>,
         {
-            let value = String::from_utf8(self.escaped_value.as_ref().to_vec())?.parse()?; // TODO(dalley): this is temporary
+            let value = self.escaped_value.parse()?;
 
             visitor.$visit(value)
         }
@@ -59,15 +59,14 @@ impl<'de, 'a> serde::Deserializer<'de> for EscapedDeserializer<'a> {
         V: Visitor<'de>,
     {
         if self.escaped {
-            match unescape(std::str::from_utf8(self.escaped_value.as_ref())?)? {
-                // TODO(dalley): remove temporary from_utf8
+            match unescape(self.escaped_value.as_ref())? {
                 Cow::Borrowed(s) => visitor.visit_str(s),
                 Cow::Owned(s) => visitor.visit_string(s),
             }
         } else {
             match self.escaped_value {
-                Cow::Borrowed(s) => visitor.visit_str(std::str::from_utf8(s)?),
-                Cow::Owned(s) => visitor.visit_string(String::from_utf8(s)?),
+                Cow::Borrowed(s) => visitor.visit_str(s),
+                Cow::Owned(s) => visitor.visit_string(s),
             }
         }
     }
@@ -101,7 +100,7 @@ impl<'de, 'a> serde::Deserializer<'de> for EscapedDeserializer<'a> {
     where
         V: Visitor<'de>,
     {
-        deserialize_bool(self.escaped_value.as_ref(), visitor)
+        deserialize_bool(&self.escaped_value.as_bytes(), visitor)
     }
 
     fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Self::Error>
@@ -122,7 +121,7 @@ impl<'de, 'a> serde::Deserializer<'de> for EscapedDeserializer<'a> {
     where
         V: Visitor<'de>,
     {
-        if self.escaped_value.as_ref().is_empty() {
+        if self.escaped_value.is_empty() {
             visitor.visit_none()
         } else {
             visitor.visit_some(self)

src/de/map.rs

@@ -236,8 +236,11 @@ where
             // try getting map from attributes (key= "value")
             let (key, value) = a.into();
             self.source = ValueSource::Attribute(value.unwrap_or_default());
-            seed.deserialize(EscapedDeserializer::new(Cow::Borrowed(&slice[key]), false))
-                .map(Some)
+            seed.deserialize(EscapedDeserializer::new(
+                Cow::Borrowed(std::str::from_utf8(&slice[key])?),
+                false,
+            )) // TODO(dalley): this is temporary
+            .map(Some)
         } else {
             // try getting from events (<key>value</key>)
             match self.de.peek()? {
@@ -288,8 +291,8 @@ where
                         // }
                         seed.deserialize(self.unflatten_fields.remove(p).into_deserializer())
                     } else {
-                        let name = Cow::Borrowed(e.local_name().into_inner());
-                        seed.deserialize(EscapedDeserializer::new(name, false))
+                        let name = std::str::from_utf8(e.local_name().into_inner())?; // TODO(dalley): this is temporary
+                        seed.deserialize(EscapedDeserializer::new(Cow::Borrowed(name), false))
                     };
                     key.map(Some)
                 }

src/de/var.rs

@@ -34,11 +34,18 @@ where
         V: DeserializeSeed<'de>,
     {
         let de = match self.de.peek()? {
-            DeEvent::Text(t) => EscapedDeserializer::new(Cow::Borrowed(t), true),
+            DeEvent::Text(t) => {
+                EscapedDeserializer::new(Cow::Borrowed(std::str::from_utf8(t)?), true)
+            } // TODO(dalley): temporary
             // Escape sequences does not processed inside CDATA section
-            DeEvent::CData(t) => EscapedDeserializer::new(Cow::Borrowed(t), false),
+            DeEvent::CData(t) => {
+                EscapedDeserializer::new(Cow::Borrowed(std::str::from_utf8(t)?), false)
+            } // TODO(dalley): temporary
             DeEvent::Start(e) => {
-                EscapedDeserializer::new(Cow::Borrowed(e.name().into_inner()), false)
+                EscapedDeserializer::new(
+                    Cow::Borrowed(std::str::from_utf8(e.name().into_inner())?),
+                    false,
+                ) // TODO(dalley): temporary
             }
             _ => {
                 return Err(DeError::Unsupported(