1 files changed, 96 insertions, 0 deletions
diff --git a/third_party/rust/serde_with/src/formats.rs b/third_party/rust/serde_with/src/formats.rs
new file mode 100644
index 0000000000..2d7aaa6965
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+++ b/third_party/rust/serde_with/src/formats.rs
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+//! Specify the format and how lenient the deserialization is
+
+use alloc::string::String;
+
+/// Specify how to serialize/deserialize a type
+///
+/// The format specifier allows to configure how a value is serialized/deserialized.
+/// For example, you can serialize a timestamp as an integer using the UNIX epoch, as a string containing an integer, or as a string using ISO 8601.
+/// This [`Format`] traits allows more flexibility in configuring the format without the need to create a new type for each case.
+pub trait Format {}
+
+macro_rules! impl_format {
+    ($(#[$attr:meta] $t:ty)*) => {
+        $(
+            #[$attr]
+            impl Format for $t {}
+        )*
+    };
+}
+macro_rules! create_format {
+    ($(#[$attr:meta] $t:ident)*) => {
+        $(
+            #[$attr]
+            #[derive(Copy, Clone, Debug, Default)]
+            pub struct $t;
+            impl_format!(#[$attr] $t);
+        )*
+    };
+}
+impl_format!(
+    /// Serialize into an i8
+    i8
+    /// Serialize into a u8
+    u8
+    /// Serialize into an i16
+    i16
+    /// Serialize into a u16
+    u16
+    /// Serialize into an i32
+    i32
+    /// Serialize into a u32
+    u32
+    /// Serialize into an i64
+    i64
+    /// Serialize into a u64
+    u64
+
+    /// Serialize into a f32
+    f32
+    /// Serialize into a f64
+    f64
+
+    /// Serialize into a bool
+    bool
+
+    /// Serialize into a String
+    String
+);
+serde::serde_if_integer128!(impl_format!(
+    /// Serialize into an i128
+    i128
+    /// Serialize into a u128
+    u128
+););
+
+create_format!(
+    /// Use uppercase characters
+    Uppercase
+    /// Use lowercase characters
+    Lowercase
+
+    /// Use in combination with [`OneOrMany`](crate::OneOrMany). Emit single element for lists of size 1.
+    PreferOne
+    /// Use in combination with [`OneOrMany`](crate::OneOrMany). Always emit the list form.
+    PreferMany
+
+    /// Emit padding during serialization.
+    Padded
+    /// Do not emit padding during serialization.
+    Unpadded
+);
+
+/// Specify how lenient the deserialization process should be
+///
+/// Formats which make use of this trait should specify how it affects the deserialization behavior.
+pub trait Strictness {}
+
+/// Use strict deserialization behavior, see [`Strictness`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct Strict;
+impl Strictness for Strict {}
+
+/// Use a flexible deserialization behavior, see [`Strictness`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct Flexible;
+impl Strictness for Flexible {}