Derive Macro SerdeYojsonEnum

#[derive(SerdeYojsonEnum)]

SerdeYojsonEnum Derive Macro

This module provides a custom derive macro SerdeYojsonEnum that generates implementations for serde::Serialize and serde::Deserialize for enums.

The macro is designed to serialize and deserialize enums in a format compatible with the OCaml yojson format. Each enum variant is serialized as a tuple where the first element is a string representing the variant name converted to snake_case with the first letter capitalized (UpperCamelCase to Snake_case), and the following elements are the variant’s fields.

Supported Enum Variants

• Unit variants: These are serialized as a single-element tuple, with just the variant name in Snake_case (capitalized first letter).
• Struct-like variants: These are serialized as a two-element tuple, with the variant name in Snake_case and a JSON object representing the named fields.
• Tuple-like variants with a single tuple element: These are serialized as a tuple with the variant name in Snake_case followed by the serialized fields of the contained tuple. The macro can handle single tuple elements of arbitrary length.

Example

#[derive(SerdeYojsonEnum)]
enum ExampleEnum {
    UnitVariant,
    NamedFieldsVariant { field1: String, field2: i32 },
    TupleVariant((String, i32, bool)),
}