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#![macro_use]
/// Macro for deriving `Serialize` and `Deserialize` for string enums with an
/// `UNKNOWN(String)` variant.
///
/// Enum should have `#[derive(EnumString, EnumVariantNames, IntoStaticStr)]` included.
///
/// Also implements `AsRef<str>`, `Display`, and `From<&str>`.
macro_rules! serde_strum_unknown {
($name:ident) => {
impl AsRef<str> for $name {
fn as_ref(&self) -> &str {
match self {
Self::UNKNOWN(string) => &*string,
known => known.into(),
}
}
}
impl std::fmt::Display for $name {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
self.as_ref().fmt(f)
}
}
impl serde::ser::Serialize for $name {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::ser::Serializer,
{
serializer.serialize_str(self.as_ref())
}
}
impl From<&str> for $name {
fn from(item: &str) -> Self {
item.parse().unwrap()
}
}
impl<'de> serde::de::Deserialize<'de> for $name {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::de::Deserializer<'de>,
{
#[cfg(not(feature = "deny-unknown-enum-variants-strings"))]
{
<&str>::deserialize(deserializer).map(Into::into)
}
#[cfg(feature = "deny-unknown-enum-variants-strings")]
{
<&str>::deserialize(deserializer)
.map(Into::into)
.and_then(|item| match item {
Self::UNKNOWN(unknown) => {
if unknown.is_empty() {
// https://github.com/RiotGames/developer-relations/issues/898
Ok(Self::UNKNOWN(unknown))
} else {
Err(serde::de::Error::unknown_variant(
&*unknown,
<Self as strum::VariantNames>::VARIANTS,
))
}
}
other => Ok(other),
})
}
}
}
impl_edeserialize!($name);
};
}
macro_rules! arr {
(
$( #[$attr:meta] )*
$v:vis $id:ident $name:ident: [$ty:ty; _] = $value:expr
) => {
$( #[$attr] )*
$v $id $name: [$ty; $value.len()] = $value;
}
}
/// Macro for newtype "enums" with integer values.
///
/// For serde, use the following:
/// ```ignore
/// #[derive(Serialize, Deserialize)]
/// #[serde(from = "$repr", into = "$repr")]
/// ```
macro_rules! newtype_enum {
{
$( #[$attr:meta] )*
$v:vis newtype_enum $name:ident($repr:ty) {
$(
$( #[$var_attr:meta] )*
$var_name:ident = $var_val:expr,
)*
}
} => {
$( #[$attr] )*
#[derive(Copy, Clone)]
#[derive(Hash, PartialEq, Eq, PartialOrd, Ord)]
#[repr(transparent)]
$v struct $name($v $repr);
impl $name {
$(
$( #[$var_attr] )*
$v const $var_name: Self = Self($var_val);
)*
}
impl $name {
arr!{
#[doc = "Array containing all known variants."]
pub const ALL_KNOWN: [Self; _] = [
$( Self::$var_name, )*
]
}
#[doc = "If this is one of the known variants."]
$v const fn is_known(self) -> bool {
match self {
$(
Self::$var_name => true,
)*
_ => false,
}
}
}
impl std::convert::From<$name> for $repr {
fn from(value: $name ) -> Self {
value.0
}
}
impl serde::ser::Serialize for $name {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::ser::Serializer,
{
<$repr>::serialize(&self.0, serializer)
}
}
impl std::convert::From<$repr> for $name {
fn from(value: $repr ) -> Self {
Self(value)
}
}
impl<'de> serde::de::Deserialize<'de> for $name {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::de::Deserializer<'de>
{
#[cfg(not(feature = "deny-unknown-enum-variants-integers"))]
{
<$repr>::deserialize(deserializer).map(Into::into)
}
#[cfg(feature = "deny-unknown-enum-variants-integers")]
{
<$repr>::deserialize(deserializer).map(Into::into)
.and_then(|item: Self| {
// Exception for id zero: https://github.com/RiotGames/developer-relations/issues/898
if 0 != item.0 && !item.is_known() {
Err(serde::de::Error::custom(format!(
"Unknown integer enum variant: {} (\"deny-unknown-enum-variants-integers\" feature is enabled).\nExpected one of the following: {:?}",
item, Self::ALL_KNOWN
)))
}
else {
Ok(item)
}
})
}
}
}
impl_edeserialize!($name);
impl std::fmt::Display for $name {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
self.0.fmt(f)
}
}
impl std::fmt::Debug for $name {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}({}{})", stringify!($name), self.0, if self.is_known() { "" } else { "?" })
}
}
}
}
macro_rules! impl_edeserialize {
($($t:ty),* $(,)?) => {
$(
#[cfg(feature = "eserde")]
impl<'de> eserde::EDeserialize<'de> for $t {
fn deserialize_for_errors<D>(deserializer: D) -> Result<(), ()>
where
D: serde::Deserializer<'de>
{
<Self as serde::de::Deserialize<'de>>::deserialize(deserializer).map(|_| ()).map_err(|e| {
eserde::reporter::ErrorReporter::report(e);
})
}
}
)*
};
}