Rename `HexVisitor` to `FromStrVisitor`

The visitor works with all types that implement `FromStr`. Whether or
not that ends up being hex encoding depends on the implementation
of `FromStr`.

src/key.rs

@@ -228,7 +228,7 @@ impl ::serde::Serialize for SecretKey {
 impl<'de> ::serde::Deserialize<'de> for SecretKey {
     fn deserialize<D: ::serde::Deserializer<'de>>(d: D) -> Result<Self, D::Error> {
         if d.is_human_readable() {
-            d.deserialize_str(super::serde_util::HexVisitor::new(
+            d.deserialize_str(super::serde_util::FromStrVisitor::new(
                 "a hex string representing 32 byte SecretKey"
             ))
         } else {
@@ -442,7 +442,7 @@ impl ::serde::Serialize for PublicKey {
 impl<'de> ::serde::Deserialize<'de> for PublicKey {
     fn deserialize<D: ::serde::Deserializer<'de>>(d: D) -> Result<PublicKey, D::Error> {
         if d.is_human_readable() {
-            d.deserialize_str(super::serde_util::HexVisitor::new(
+            d.deserialize_str(super::serde_util::FromStrVisitor::new(
                 "an ASCII hex string representing a public key"
             ))
         } else {

src/lib.rs

@@ -444,7 +444,7 @@ impl ::serde::Serialize for Signature {
 impl<'de> ::serde::Deserialize<'de> for Signature {
     fn deserialize<D: ::serde::Deserializer<'de>>(d: D) -> Result<Self, D::Error> {
         if d.is_human_readable() {
-            d.deserialize_str(serde_util::HexVisitor::new(
+            d.deserialize_str(serde_util::FromStrVisitor::new(
                 "a hex string representing a DER encoded Signature"
             ))
         } else {

src/schnorrsig.rs

@@ -34,7 +34,7 @@ impl ::serde::Serialize for Signature {
 impl<'de> ::serde::Deserialize<'de> for Signature {
     fn deserialize<D: ::serde::Deserializer<'de>>(d: D) -> Result<Self, D::Error> {
         if d.is_human_readable() {
-            d.deserialize_str(super::serde_util::HexVisitor::new(
+            d.deserialize_str(super::serde_util::FromStrVisitor::new(
                 "a hex string representing 64 byte schnorr signature"
             ))
         } else {
@@ -417,7 +417,7 @@ impl ::serde::Serialize for PublicKey {
 impl<'de> ::serde::Deserialize<'de> for PublicKey {
     fn deserialize<D: ::serde::Deserializer<'de>>(d: D) -> Result<Self, D::Error> {
         if d.is_human_readable() {
-            d.deserialize_str(super::serde_util::HexVisitor::new(
+            d.deserialize_str(super::serde_util::FromStrVisitor::new(
                 "a hex string representing 32 byte schnorr public key"
             ))
         } else {

src/serde_util.rs

@@ -3,21 +3,22 @@ use core::marker::PhantomData;
 use core::str::{self, FromStr};
 use serde::de;
 
-pub struct HexVisitor<T> {
+/// A serde visitor that works for `T`s implementing `FromStr`.
+pub struct FromStrVisitor<T> {
     expectation: &'static str,
     _pd: PhantomData<T>,
 }
 
-impl<T> HexVisitor<T> {
+impl<T> FromStrVisitor<T> {
     pub fn new(expectation: &'static str) -> Self {
-        HexVisitor {
+        FromStrVisitor {
             expectation,
             _pd: PhantomData,
         }
     }
 }
 
-impl<'de, T> de::Visitor<'de> for HexVisitor<T>
+impl<'de, T> de::Visitor<'de> for FromStrVisitor<T>
 where
     T: FromStr,
     <T as FromStr>::Err: fmt::Display,