aksr/lib.rs
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//! # aksr
//!
//! `aksr` is a Rust derive macro designed to simplify struct management by automatically generating getter and setter methods for both named and tuple structs.
//!
//!
//! ## Example: Named Struct
//!
//! This example demonstrates the use of `aksr` with a named struct, `Rect`. The `attrs` field is set with an alias, a custom setter prefix, and the ability to increment values, while disabling the generation of a getter method for `attrs`.
//!
//! ```rust
//! use aksr::Builder;
//!
//! #[derive(Builder, Debug, Default)]
//! struct Rect {
//! x: f32,
//! y: f32,
//! w: f32,
//! h: f32,
//! #[args(
//! alias = "attributes",
//! setter_prefix = "set",
//! inc = true,
//! getter = false
//! )]
//! attrs: Vec<String>,
//! }
//!
//! let rect = Rect::default()
//! .with_x(0.0)
//! .with_y(0.0)
//! .with_w(10.0)
//! .with_h(5.0)
//! .set_attributes(&["A", "X", "Z"])
//! .set_attributes_inc(&["O"])
//! .set_attributes_inc(&["P"]);
//!
//! println!("rect: {:?}", rect);
//! println!("x: {}", rect.x());
//! println!("y: {}", rect.y());
//! println!("w: {}", rect.w());
//! println!("h: {}", rect.h());
//! println!("attrs: {:?}", rect.attrs);
//! // println!("attrs: {:?}", rect.attrs()); // Method `attrs` is not generated
//! ```
//!
//! ## Example: Tuple Struct
//!
//! Here, `aksr` is used with a tuple struct, `Color`. The example demonstrates customizing getter and setter prefixes, defining an alias for a specific field, and configuring one field to be incrementable.
//!
//! ```rust
//! use aksr::Builder;
//!
//! #[derive(Builder, Default, Debug)]
//! struct Color<'a>(
//! u8,
//! u8,
//! u8,
//! #[args(alias = "alpha")] f32,
//! #[args(inc = true, getter_prefix = "get", setter_prefix = "set")] Vec<&'a str>,
//! );
//!
//! let color = Color::default()
//! .with_0(255)
//! .with_1(255)
//! .with_2(0)
//! .with_alpha(0.8)
//! .set_4(&["A", "B", "C"])
//! .set_4_inc(&["D", "E"]);
//!
//! println!(
//! "RGBA: ({}, {}, {}, {}, {:?})",
//! color.nth_0(),
//! color.nth_1(),
//! color.nth_2(),
//! color.alpha(),
//! color.get_4(),
//! );
//! ```
//!
use proc_macro::TokenStream;
use proc_macro2::{Ident, Span};
use quote::quote;
use syn::{
parse_macro_input, Data, DataStruct, DeriveInput, Field, GenericArgument, Index, PathArguments,
Type,
};
mod misc;
use misc::{Fns, Rules, Tys};
const ARGS: &str = "args";
const ALIAS: &str = "alias";
const GETTER: &str = "getter";
const SETTER: &str = "setter";
const SETTER_PREFIX: &str = "setter_prefix";
const GETTER_PREFIX: &str = "getter_prefix";
const INC_FOR_VEC: &str = "inc";
const SETTER_PREFIX_DEFAULT: &str = "with";
const GETTER_PREFIX_DEFAULT: &str = "nth";
const PRIMITIVE_TYPES: &[&str] = &[
"i8", "i16", "i32", "i64", "i128", "isize", "u8", "u16", "u32", "u64", "u128", "usize", "bool",
"char", "unit", "f32", "f64",
];
#[proc_macro_derive(Builder, attributes(args))]
pub fn derive(x: TokenStream) -> TokenStream {
let st = parse_macro_input!(x as DeriveInput);
let expanded = build_expanded(st);
TokenStream::from(expanded)
}
fn build_expanded(st: DeriveInput) -> proc_macro2::TokenStream {
// generate code
let code = match &st.data {
Data::Struct(data) => generate_from_struct(data),
Data::Enum(_) | Data::Union(_) => panic!("Builder(aksr) can only be derived for struct"),
};
// attrs
let (struct_name, (impl_generics, ty_generics, where_clause)) =
(&st.ident, &st.generics.split_for_impl());
// token stream
quote! {
impl #impl_generics #struct_name #ty_generics #where_clause {
#code
}
}
}
fn generate_from_struct(data_struct: &DataStruct) -> proc_macro2::TokenStream {
// code container
let mut codes = quote! {};
// traverse
for (idx, field) in data_struct.fields.iter().enumerate() {
// build rules from field
let rules = Rules::from(field);
// generate code based on field
match &field.ty {
Type::Path(type_path) => {
if let Some(last_segment) = type_path.path.segments.last() {
match last_segment.ident.to_string().as_str() {
"String" => {
generate(
field,
&rules,
idx,
None,
&mut codes,
Fns::Setter(Tys::String),
);
generate(
field,
&rules,
idx,
None,
&mut codes,
Fns::Getter(Tys::String),
);
}
"Vec" => {
// Vec<T> -> &[T]
if let PathArguments::AngleBracketed(args) = &last_segment.arguments {
if let Some(arg) = args.args.first() {
if let GenericArgument::Type(ty) = arg {
if let Type::Path(type_path) = &ty {
if let Some(last_segment) =
type_path.path.segments.last()
{
let ident = &last_segment.ident;
// Vec<String> -> &[&str]
if ident == "String" {
generate(
field,
&rules,
idx,
None,
&mut codes,
Fns::Setter(Tys::VecString),
);
// increment ver
generate(
field,
&rules,
idx,
None,
&mut codes,
Fns::Setter(Tys::VecStringInc),
);
} else {
// setters
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Setter(Tys::Vec),
);
// setters inc
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Setter(Tys::VecInc),
);
}
// getters: Vec<T> -> &[T]
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Getter(Tys::Vec),
);
}
} else {
// Vec<T> -> &[T]
// setters
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Setter(Tys::Vec),
);
// setters inc
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Setter(Tys::VecInc),
);
// getters: Vec<T> -> &[T]
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Getter(Tys::Vec),
);
}
}
}
}
}
"Option" => {
// Option<T>
// - T => String => &str
// - T => Vec<U> => &[U]
// - U => String => &str
if let PathArguments::AngleBracketed(args) = &last_segment.arguments {
if let Some(arg) = &args.args.first() {
if let GenericArgument::Type(ty) = arg {
if let Type::Path(type_path) = &ty {
if let Some(last_segment) =
type_path.path.segments.last()
{
let ident = &last_segment.ident;
// T => Vec<U> => &[U]
if ident == "Vec" {
if let PathArguments::AngleBracketed(args) =
&last_segment.arguments
{
// U
if let Some(arg) = args.args.first() {
if let GenericArgument::Type(
Type::Path(type_path),
) = arg
{
if let Some(last_segment) =
type_path.path.segments.last()
{
// U => String => &str
// Option<Vec<String>> -> Option<&[&str]>
if last_segment.ident
== "String"
{
generate(
field,
&rules,
idx,
None,
&mut codes,
Fns::Setter(Tys::OptionVecString),
);
} else {
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Setter(
Tys::OptionVec,
),
);
}
}
} else {
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Setter(Tys::OptionVec),
);
}
// getters: Option<Vec<T>> -> Option<&[T]>
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Getter(Tys::OptionVec),
);
}
}
} else if ident == "String" {
// T => String => &str
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Setter(Tys::OptionString),
);
// getters: Option<String> -> Option<&str>
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Getter(Tys::OptionString),
);
} else {
// T => T
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Setter(Tys::Option),
);
if PRIMITIVE_TYPES
.contains(&ident.to_string().as_str())
{
// getters: Option<T> -> Option<T>
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Getter(Tys::Option),
);
} else {
// getters: Option<T> -> Option<&T>
// Option<Box<T>>, Option<Option<T>>
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Getter(Tys::OptionAsRef),
);
}
}
}
} else {
// others: Option<(u8, i8)>, Option<&'a str>,
if let PathArguments::AngleBracketed(args) =
&last_segment.arguments
{
if let Some(arg) = args.args.first() {
// setters
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Setter(Tys::Option),
);
// getters
if let GenericArgument::Type(ty) = arg {
match ty {
Type::Reference(_) => {
// getters: Option<T> -> Option<T>
// Option<&'a str>
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Getter(Tys::Option),
);
}
_ => {
// getters: Option<T> -> Option<&T>
// Option<(u8, i8)>
generate(
field,
&rules,
idx,
Some(arg),
&mut codes,
Fns::Getter(Tys::OptionAsRef),
);
}
}
}
}
}
}
}
}
}
}
xxx => {
generate(
field,
&rules,
idx,
None,
&mut codes,
Fns::Setter(Tys::Basic),
);
if PRIMITIVE_TYPES.contains(&xxx) {
generate(
field,
&rules,
idx,
None,
&mut codes,
Fns::Getter(Tys::Basic),
);
} else {
generate(
field,
&rules,
idx,
None,
&mut codes,
Fns::Getter(Tys::Ref),
);
}
}
}
}
}
ty => {
// setter
generate(
field,
&rules,
idx,
None,
&mut codes,
Fns::Setter(Tys::Basic),
);
// getter
match ty {
Type::Reference(_) => {
// &'a T or &'a mut T
generate(
field,
&rules,
idx,
None,
&mut codes,
Fns::Getter(Tys::Basic),
);
}
Type::Array(_) | Type::Tuple(_) => {
// array [T; n] and tuple (A, B, C, String)
generate(field, &rules, idx, None, &mut codes, Fns::Getter(Tys::Ref));
}
_ => {
// TODO: others
generate(field, &rules, idx, None, &mut codes, Fns::Getter(Tys::Ref));
}
}
}
}
}
// token stream
quote! {
#codes
}
}
fn generate(
field: &Field,
rules: &Rules,
idx: usize,
arg: Option<&GenericArgument>,
codes: &mut proc_macro2::TokenStream,
fn_type: Fns,
) {
// setter_name & getter_name
let (setter_name, getter_name) = rules.generate_setter_getter_names(field, idx); // (move inside????)
// attrs
let field_type = &field.ty;
let field_name = field.ident.as_ref();
let field_index = Index::from(idx);
let field_access = field_name.map_or_else(|| quote! { #field_index }, |name| quote! { #name });
// token stream
let code = match fn_type {
Fns::Setter(ty) => {
if !rules.gen_setter {
return;
}
match ty {
Tys::Basic => {
quote! {
pub fn #setter_name(mut self, x: #field_type) -> Self {
self.#field_access = x;
self
}
}
}
Tys::String => {
quote! {
pub fn #setter_name(mut self, x: &str) -> Self {
self.#field_access = x.to_string();
self
}
}
}
Tys::Vec => {
let arg = arg.expect("Vec setter requires a generic argument");
quote! {
pub fn #setter_name(mut self, x: &[#arg]) -> Self {
self.#field_access = x.to_vec();
self
}
}
}
Tys::VecInc if rules.inc_for_vec => {
let arg = arg.expect("VecInc setter requires a generic argument");
let setter_name = Ident::new(
&format!("{}_{}", setter_name, INC_FOR_VEC),
Span::call_site(),
);
quote! {
pub fn #setter_name(mut self, x: &[#arg]) -> Self {
if self.#field_access.is_empty() {
self.#field_access = Vec::from(x);
} else {
self.#field_access.extend_from_slice(x);
}
self
}
}
}
Tys::VecString => {
quote! {
pub fn #setter_name(mut self, x: &[&str]) -> Self {
self.#field_access = x.iter().map(|s| s.to_string()).collect();
self
}
}
}
Tys::VecStringInc if rules.inc_for_vec => {
let setter_name = Ident::new(
&format!("{}_{}", setter_name, INC_FOR_VEC),
Span::call_site(),
);
quote! {
pub fn #setter_name(mut self, x: &[&str]) -> Self {
if self.#field_access.is_empty() {
self.#field_access = x.iter().map(|s| s.to_string()).collect();
} else {
let mut x = x.iter().map(|s| s.to_string()).collect::<Vec<_>>();
self.#field_access.append(&mut x);
}
self
}
}
}
Tys::Option => {
quote! {
pub fn #setter_name(mut self, x: #arg) -> Self {
self.#field_access = Some(x);
self
}
}
}
Tys::OptionVec => {
let arg = arg.expect("OptionVec setter requires a generic argument");
quote! {
pub fn #setter_name(mut self, x: &[#arg]) -> Self {
self.#field_access = Some(x.to_vec());
self
}
}
}
Tys::OptionVecString => {
quote! {
pub fn #setter_name(mut self, x: &[&str]) -> Self {
self.#field_access = Some(x.iter().map(|s| s.to_string()).collect());
self
}
}
}
Tys::OptionString => {
quote! {
pub fn #setter_name(mut self, x: &str) -> Self {
self.#field_access = Some(x.to_string());
self
}
}
}
_ => quote! {},
}
}
Fns::Getter(ty) => {
if !rules.gen_getter {
return;
}
match ty {
Tys::Basic => {
quote! {
pub fn #getter_name(&self) -> #field_type {
self.#field_access
}
}
}
Tys::Ref => {
quote! {
pub fn #getter_name(&self) -> &#field_type {
&self.#field_access
}
}
}
Tys::String => {
quote! {
pub fn #getter_name(&self) -> &str {
&self.#field_access
}
}
}
Tys::Vec => {
let arg = arg.expect("Vec getter requires a generic argument");
quote! {
pub fn #getter_name(&self) -> &[#arg] {
&self.#field_access
}
}
}
Tys::Option => {
let arg = arg.expect("Option getter requires a generic argument");
quote! {
pub fn #getter_name(&self) -> Option<#arg> {
self.#field_access
}
}
}
Tys::OptionAsRef => {
let arg = arg.expect("OptionAsRef getter requires a generic argument");
quote! {
pub fn #getter_name(&self) -> Option<&#arg> {
self.#field_access.as_ref()
}
}
}
Tys::OptionString => {
quote! {
pub fn #getter_name(&self) -> Option<&str> {
self.#field_access.as_deref()
}
}
}
Tys::OptionVec => {
let arg = arg.expect("OptionVec getter requires a generic argument");
quote! {
pub fn #getter_name(&self) -> Option<&[#arg]> {
self.#field_access.as_deref()
}
}
}
_ => quote! {},
}
}
};
// append
codes.extend(code);
}