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#![recursion_limit = "128"] extern crate proc_macro; use proc_macro::TokenStream; extern crate heck; extern crate syn; #[macro_use] extern crate quote; mod util; mod tuple; mod record; mod map; mod ex_struct; mod unit_enum; mod untagged_enum; /// Implementation of the `NifStruct` macro that lets the user annotate a struct that will /// be translated directly from an Elixir struct to a Rust struct. For example, the following /// struct, annotated as such: /// /// ```text /// #[derive(Debug, NifStruct)] /// #[module = "AddStruct"] /// struct AddStruct { /// lhs: i32, /// rhs: i32, /// } /// ``` /// /// This would be translated by Rustler into: /// /// ```text /// defmodule AddStruct do /// defstruct lhs: 0, rhs: 0 /// end /// ``` #[proc_macro_derive(NifStruct, attributes(module))] pub fn nif_struct(input: TokenStream) -> TokenStream { let s = input.to_string(); let ast = syn::parse_macro_input(&s).unwrap(); let gen = ex_struct::transcoder_decorator(&ast); gen.unwrap().parse().unwrap() } /// Implementation of a macro that lets the user annotate a struct with `NifMap` so that the /// struct can be encoded or decoded from an Elixir map. For example, the following struct /// annotated as such: /// /// ```text /// #[derive(NifMap)] /// struct AddMap { /// lhs: i32, /// rhs: i32, /// } /// ``` /// /// Given the values 33 and 21 for this struct, this would result, when encoded, in an elixir /// map with two elements like: /// /// ```text /// %{lhs: 33, rhs: 21} /// ``` #[proc_macro_derive(NifMap)] pub fn nif_map(input: TokenStream) -> TokenStream { let s = input.to_string(); let ast = syn::parse_macro_input(&s).unwrap(); let gen = map::transcoder_decorator(&ast); gen.unwrap().parse().unwrap() } /// Implementation of a macro that lets the user annotate a struct with `NifTuple` so that the /// struct can be encoded or decoded from an Elixir map. For example, the following struct /// annotated as such: /// /// ```text /// #[derive(NifTuple)] /// struct AddTuple { /// lhs: i32, /// rhs: i32, /// } /// ``` /// /// Given the values 33 and 21 for this struct, this would result, when encoded, in an elixir /// tuple with two elements like: /// /// ```text /// {33, 21} /// ``` /// /// The size of the tuple will depend on the number of elements in the struct. #[proc_macro_derive(NifTuple)] pub fn nif_tuple(input: TokenStream) -> TokenStream { let s = input.to_string(); let ast = syn::parse_macro_input(&s).unwrap(); let gen = tuple::transcoder_decorator(&ast); gen.unwrap().parse().unwrap() } /// Implementation of the `NifRecord` macro that lets the user annotate a struct that will /// be translated directly from an Elixir struct to a Rust struct. For example, the following /// struct, annotated as such: /// /// ```text /// #[derive(Debug, NifRecord)] /// #[tag = "record"] /// struct AddRecord { /// lhs: i32, /// rhs: i32, /// } /// ``` /// /// This would be translated by Rustler into: /// /// ```text /// defmodule AddRecord do /// import Record /// defrecord :record, [lhs: 1, rhs: 2] /// end /// ``` #[proc_macro_derive(NifRecord, attributes(tag))] pub fn nif_record(input: TokenStream) -> TokenStream { let s = input.to_string(); let ast = syn::parse_macro_input(&s).unwrap(); let gen = record::transcoder_decorator(&ast); gen.unwrap().parse().unwrap() } /// Implementation of the `NifUnitEnum` macro that lets the user annotate an enum with a unit type /// that will generate elixir atoms when encoded /// /// ```text /// #[derive(NifUnitEnum)] /// enum UnitEnum { /// FooBar, /// Baz, /// } /// ``` /// /// An example usage in elixir would look like the following. /// /// ```text /// test "unit enum transcoder" do /// assert :foo_bar == RustlerTest.unit_enum_echo(:foo_bar) /// assert :baz == RustlerTest.unit_enum_echo(:baz) /// assert :invalid_variant == RustlerTest.unit_enum_echo(:somethingelse) /// end /// ``` /// /// Note that the `:invalid_variant` atom is returned if the user tries to encode something /// that isn't in the Rust enum. #[proc_macro_derive(NifUnitEnum)] pub fn nif_unit_enum(input: TokenStream) -> TokenStream { let s = input.to_string(); let ast = syn::parse_macro_input(&s).unwrap(); let gen = unit_enum::transcoder_decorator(&ast); gen.unwrap().parse().unwrap() } /// Implementation of the `NifUntaggedEnum` macro that lets the user annotate an enum that will /// generate elixir values when decoded. This can be used for rust enums that contain data and /// will generate a value based on the kind of data encoded. For example from the test code: /// /// ```text /// #[derive(NifUntaggedEnum)] /// enum UntaggedEnum { /// Foo(u32), /// Bar(String), /// Baz(AddStruct), /// } /// /// pub fn untagged_enum_echo<'a>(env: Env<'a>, args: &[Term<'a>]) -> NifResult<Term<'a>> { /// let untagged_enum: UntaggedEnum = args[0].decode()?; /// Ok(untagged_enum.encode(env)) /// } /// ``` /// /// This can be used from elixir in the following manner. /// /// ```text /// test "untagged enum transcoder" do /// assert 123 == RustlerTest.untagged_enum_echo(123) /// assert "Hello" == RustlerTest.untagged_enum_echo("Hello") /// assert %AddStruct{lhs: 45, rhs: 123} = RustlerTest.untagged_enum_echo(%AddStruct{lhs: 45, rhs: 123}) /// assert :invalid_variant == RustlerTest.untagged_enum_echo([1,2,3,4]) /// end /// ``` /// /// Note that the type of elixir return is dependent on the data in the enum and the actual enum /// type is lost in the translation because Elixir has no such concept. #[proc_macro_derive(NifUntaggedEnum)] pub fn nif_untagged_enum(input: TokenStream) -> TokenStream { let s = input.to_string(); let ast = syn::parse_macro_input(&s).unwrap(); let gen = untagged_enum::transcoder_decorator(&ast); gen.unwrap().parse().unwrap() }