1 files changed, 93 insertions, 0 deletions
diff --git a/vendor/bitflags/src/external/serde.rs b/vendor/bitflags/src/external/serde.rs
new file mode 100644
index 0000000..be4f2ed
--- /dev/null
+++ b/vendor/bitflags/src/external/serde.rs
@@ -0,0 +1,93 @@
+//! Specialized serialization for flags types using `serde`.
+
+use crate::{
+    parser::{self, ParseHex, WriteHex},
+    Flags,
+};
+use core::{fmt, str};
+use serde::{
+    de::{Error, Visitor},
+    Deserialize, Deserializer, Serialize, Serializer,
+};
+
+/**
+Serialize a set of flags as a human-readable string or their underlying bits.
+
+Any unknown bits will be retained.
+*/
+pub fn serialize<B: Flags, S: Serializer>(flags: &B, serializer: S) -> Result<S::Ok, S::Error>
+where
+    B::Bits: WriteHex + Serialize,
+{
+    // Serialize human-readable flags as a string like `"A | B"`
+    if serializer.is_human_readable() {
+        serializer.collect_str(&parser::AsDisplay(flags))
+    }
+    // Serialize non-human-readable flags directly as the underlying bits
+    else {
+        flags.bits().serialize(serializer)
+    }
+}
+
+/**
+Deserialize a set of flags from a human-readable string or their underlying bits.
+
+Any unknown bits will be retained.
+*/
+pub fn deserialize<'de, B: Flags, D: Deserializer<'de>>(deserializer: D) -> Result<B, D::Error>
+where
+    B::Bits: ParseHex + Deserialize<'de>,
+{
+    if deserializer.is_human_readable() {
+        // Deserialize human-readable flags by parsing them from strings like `"A | B"`
+        struct FlagsVisitor<B>(core::marker::PhantomData<B>);
+
+        impl<'de, B: Flags> Visitor<'de> for FlagsVisitor<B>
+        where
+            B::Bits: ParseHex,
+        {
+            type Value = B;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a string value of `|` separated flags")
+            }
+
+            fn visit_str<E: Error>(self, flags: &str) -> Result<Self::Value, E> {
+                parser::from_str(flags).map_err(|e| E::custom(e))
+            }
+        }
+
+        deserializer.deserialize_str(FlagsVisitor(Default::default()))
+    } else {
+        // Deserialize non-human-readable flags directly from the underlying bits
+        let bits = B::Bits::deserialize(deserializer)?;
+
+        Ok(B::from_bits_retain(bits))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use serde_test::{assert_tokens, Configure, Token::*};
+    bitflags! {
+        #[derive(serde_derive::Serialize, serde_derive::Deserialize, Debug, PartialEq, Eq)]
+        #[serde(transparent)]
+        struct SerdeFlags: u32 {
+            const A = 1;
+            const B = 2;
+            const C = 4;
+            const D = 8;
+        }
+    }
+
+    #[test]
+    fn test_serde_bitflags_default() {
+        assert_tokens(&SerdeFlags::empty().readable(), &[Str("")]);
+
+        assert_tokens(&SerdeFlags::empty().compact(), &[U32(0)]);
+
+        assert_tokens(&(SerdeFlags::A | SerdeFlags::B).readable(), &[Str("A | B")]);
+
+        assert_tokens(&(SerdeFlags::A | SerdeFlags::B).compact(), &[U32(1 | 2)]);
+    }
+}