synonym 0.1.6

Customizable derive macro to create newtypes. It peeks into the underlying type to choose which traits should be implemented.
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//! # Overview
//!
//! The `synonym` library is a Rust crate designed to simplify the creation of newtypes. It provides a customizable `#[derive(Synonym)]` macro that automatically implements various traits based on the underlying type of your newtype. This saves you from the boilerplate code usually required when defining newtypes.
//!
//! # Usage
//!
//! To use `synonym`, add it to your Cargo.toml:
//!
//! ```toml
//! [dependencies]
//! synonym = "0.1.5"
//! ```
//!
//! ## Basic example
//!
//! Import the `Synonym` trait into your Rust file:
//!
//! ```rust
//! use synonym::Synonym;
//! ```
//!
//! Then, define your newtype and annotate it with `#[derive(Synonym)]:`
//! ```rust
//! #[derive(Synonym)]
//! pub struct MyInt(i32);
//! ```
//!
//! ## Customization with Attributes
//! You can customize which traits are implemented or skipped using the `#[synonym(skip(...))]` and `#[synonym(force(...))]` attributes:
//! ```rust
//! #[derive(Synonym)]
//! #[synonym(skip(Eq, PartialEq))]
//! pub struct MyString(String);
//! ```
//!
//! Supported `skip` and `force` values are listed in the *Trait implementation table* below.
//!
//! # Generated code
//! When you use `#[derive(Synonym)]`, the library generates implementations for various traits. Here's a simplified example for a newtype `MyInt(i32)`:
//! ```rust
//! impl Eq for MyInt {}
//! impl PartialEq for MyInt {
//!     fn eq(&self, other: &Self) -> bool {
//!         self.0 == other.0
//!     }
//! }
//! // ... and so on for other traits
//! ```
//!
//! # Trait implementation table
//!
//! Custom methods
//!
//! |                  | skip/force  | `Integer` [1] | `NonZero*` | `Float` | `String` | `Box<str>` | `&'static str` | `char` |
//! |------------------|-------------|---------------|------------|---------|----------|------------|----------------|--------|
//! | .as_str()        | String      |               |            |         |     v    |      v     |        v       |    v   |
//! | .value() [2]     | Value       |      v        |      v     |    v    |     v    |      v     |        v       |    v   |
//!
//!
//! Conversion
//!
//! |                  | skip/force  | `Integer` [1] | `NonZero*` | `Float` | `String` | `Box<str>` | `&'static str` | `char` |
//! |------------------|-------------|---------------|------------|---------|----------|------------|----------------|--------|
//! | AsRef<Inner>     | AsRef       |        v      |      v     |    v    |     v    |      v     |        v       |    v   |
//! | Borrow<str>      | String      |               |            |         |     v    |      v     |        v       |        |
//! | From<&'a str>    | String      |               |            |         |     v    |      v [4] |                |        |
//! | From<String>     | String      |               |            |         |          |      v     |                |        |
//! | Deref<Inner> [3] | Deref       |               |            |         |          |            |                |        |
//! | DerefMut     [3] | DerefMut    |               |            |         |          |            |                |        |
//! | From<Inner>      | From        |        v      |      v     |    v    |     v    |      v     |        v       |    v   |
//! | FromStr          | FromStr     |        v      |      v     |    v    |     v    |      v     |                |    v   |
//!
//! Fundamental traits
//!
//! |                  | skip/force  | `Integer` [1] | `NonZero*` | `Float` | `String` | `Box<str>` | `&'static str` | `char` |
//! |------------------|-------------|---------------|------------|---------|----------|------------|----------------|--------|
//! | Clone            | Clone       |        v      |      v     |    v    |     v    |      v     |        v       |    v   |
//! | Copy             | Copy        |        v      |      v     |    v    |                       |        v       |    v   |
//! | Debug            | Debug       |        v      |      v     |    v    |     v    |      v     |        v       |    v   |
//! | Default          | Default     |        v      |            |    v    |     v    |      v     |        v       |    v   |
//! | Display [5]      | Display     |        v      |      v     |    v    |     v    |      v     |        v       |    v   |
//! | Hash             | Hash        |        v      |      v     |         |     v    |      v     |        v       |    v   |
//!
//! Comparison
//!
//! |                  | skip/force  | `Integer` [1] | `NonZero*` | `Float` | `String` | `Box<str>` | `&'static str` | `char` |
//! |------------------|-------------|---------------|------------|---------|----------|------------|----------------|--------|
//! | PartialOrd       | PartialOrd  |       v       |      v     |    v    |     v    |      v     |        v       |    v   |
//! | Ord              | Ord         |       v       |      v     |         |     v    |      v     |        v       |    v   |
//! | PartialEq        | PartialEq   |       v       |      v     |    v    |     v    |      v     |        v       |    v   |
//! | Eq               | Eq          |       v       |      v     |         |     v    |      v     |        v       |    v   |
//!
//! Serde [6]
//!
//! |                  | skip/force  | `Integer` [1] | `NonZero*` | `Float` | `String` | `Box<str>` | `&'static str` | `char` |
//! |------------------|-------------|---------------|------------|---------|----------|------------|----------------|--------|
//! | Serialize        | Serialize   |       v       |      v     |    v    |     v    |      v     |                |    v   |
//! | Deserialize      | Deserialize |       v       |      v     |    v    |     v    |      v     |                |    v   |
//!
//! Maths [7]
//!
//! |                  | skip/force  | `Integer` [1] | `NonZero*` | `Float` | `String` | `Box<str>` | `&'static str` | `char` |
//! |------------------|-------------|---------------|------------|---------|----------|------------|----------------|--------|
//! | Add<Self>=Self   | Number      |       v       |            |    v    |                       |                |        |
//! | AddAssign<Self>  | Number      |       v       |            |    v    |                       |                |        |
//! | Sub<Self>=Self   | Number      |       v       |            |    v    |                       |                |        |
//! | SubAssign<Self>  | Number      |       v       |            |    v    |                       |                |        |
//! | Mul<Self>=Self   | Number      |       v       |            |    v    |                       |                |        |
//! | MulAssign<Self>  | Number      |       v       |            |    v    |                       |                |        |
//! | Div<Self>=Self   | Number      |       v       |            |    v    |                       |                |        |
//! | DivAssign<Self>  | Number      |       v       |            |    v    |                       |                |        |
//!
//!
//! [1] Integers are: `u8`, `u16`, `u32`, `u64`, `u128`, `usize`, `i8`, `i16`, `i32`, `i64`, `i128`, `isize`
//! [2] .value() returns `Inner` for `Copy` types and `&Inner` for non-`Copy` types
//! [3] `Deref` and `DerefMut` are never implemented unless they are forced with `#[synonym(force(Deref,DerefMut))]`
//! [4] In constrast to other strings, `FromStr` for `Box<str>` synonyms uses `Inner::From<&'str>` instead of `Inner::FromStr` since there is no `FromStr` implementation for `Box<str>`
//! [5] Display implementation can be configured, see below
//! [6] Only provided when feature `with_serde` is enabled
//! [7] This is subject to change
//!
//! # Fine-tuning
//!
//! ## Display
//! To specify how the Display trait should be implemented, you can use the `#[synonym(display = "...")]` attribute. Here are the available options:
//!
//! * `Opaque`: Formats the output as TypeName(Value).
//! * `Transparent`: Directly uses the inner type's Display implementation.
//! * `UpperCase`: Converts the inner value to uppercase before displaying.
//! * `LowerCase`: Converts the inner value to lowercase before displaying.
//! * `OpaqueUpperCase`: Formats the output as TypeName(VALUE) where VALUE is uppercase.
//! * `OpaqueLowerCase`: Formats the output as TypeName(value) where value is lowercase.
//! * `Custom string`: Allows for a custom format string
//!
//! ### Examples
//! ```rust
//! #[derive(Synonym)]
//! #[synonym(display = "UpperCase")]
//! struct CountryName(String);
//!
//! #[derive(Synonym)]
//! #[synonym(display = "::<> {} <>::")]
//! struct Turbo(String);
//! ```
//!
//! ## Serde Support
//!
//! To enable Serde support for serialization and deserialization, you'll need to enable the `with_serde` feature flag in your `Cargo.toml`:
//!
//! ```toml
//! [dependencies]
//! synonym = { version = "0.1.5", features = ["with_serde"] }
//! ```
//!
//! With this feature enabled, the `Serialize` and `Deserialize` traits will be automatically implemented for your type.
//!
//! ---
//! This documentation was generated with the assistance of ChatGPT-4 by OpenAI.

extern crate proc_macro;

mod analyze;
mod attrs;
mod impls;
mod info;

use crate::proc_macro::TokenStream;
use crate::{analyze::analyze, impls::*};
use quote::quote;
use quote::TokenStreamExt;
use syn::{parse_macro_input, DeriveInput};

#[proc_macro_derive(Synonym, attributes(synonym))]
pub fn synonym_derive(input: TokenStream) -> TokenStream {
    let input: DeriveInput = parse_macro_input!(input as DeriveInput);
    let info = analyze(&input).expect("Synonym supports only tuple structs with single unnamed field. Enums, unions and generic type parameters are not supported");
    let mut expanded = quote! {};

    expanded.append_all(&[
        impl_eq(&info),
        impl_partial_eq(&info),
        impl_ord(&info),
        impl_partial_ord(&info),
        impl_clone(&info),
        impl_copy(&info),
        impl_hash(&info),
        impl_default(&info),
        impl_debug(&info),
        impl_as_ref(&info),
        impl_deref(&info),
        impl_deref_mut(&info),
        impl_from(&info),
        impl_from_str(&info),
        impl_display(&info),
        impl_string(&info),
        impl_number(&info),
        impl_serialize(&info),
        impl_deserialize(&info),
        impl_value(&info),
    ]);

    TokenStream::from(expanded)
}