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refactor: separate macro impl and interface #1

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Merged
merged 1 commit into from
Feb 13, 2024
Merged

refactor: separate macro impl and interface #1

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136 changes: 3 additions & 133 deletions crates/bevy_interleave_macros/src/lib.rs
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Original file line number Diff line number Diff line change
@@ -1,18 +1,14 @@
extern crate proc_macro;

use proc_macro::TokenStream;
use quote::quote;
use syn::{
Data,
DeriveInput,
Error,
Fields,
FieldsNamed,
Ident,
Result,
parse_macro_input,
};

mod planar;
use planar::generate_planar_struct;


#[proc_macro_derive(Planar)]
pub fn planar_macro_derive(input: TokenStream) -> TokenStream {
Expand All @@ -25,129 +21,3 @@ pub fn planar_macro_derive(input: TokenStream) -> TokenStream {

TokenStream::from(output)
}

fn generate_planar_struct(input: &DeriveInput) -> Result<quote::__private::TokenStream> {
let name = &input.ident;
let planar_name = Ident::new(&format!("Planar{}", name), name.span());

let fields_struct = if let Data::Struct(ref data_struct) = input.data {
match data_struct.fields {
Fields::Named(ref fields) => fields,
_ => return Err(Error::new_spanned(input, "Unsupported struct type")),
}
} else {
return Err(Error::new_spanned(input, "Planar macro only supports structs"));
};

let field_names = fields_struct.named.iter().map(|f| f.ident.as_ref().unwrap());
let field_types = fields_struct.named.iter().map(|_| quote! { Vec<i32> });

let conversion_methods = generate_conversion_methods(name, fields_struct);
let get_set_methods = generate_accessor_setter_methods(name, fields_struct);
let len_method = generate_len_method(fields_struct);

let expanded = quote! {
pub struct #planar_name {
#(pub #field_names: #field_types,)*
}

impl Planar<#name> for #planar_name {
#conversion_methods
#get_set_methods
#len_method
}
};

Ok(expanded)
}


fn generate_len_method(fields_named: &FieldsNamed) -> quote::__private::TokenStream {
if let Some(first_field) = fields_named.named.first() {
let first_field_name = first_field.ident.as_ref().unwrap();
quote! {
fn is_empty(&self) -> bool {
self.#first_field_name.is_empty()
}

fn len(&self) -> usize {
self.#first_field_name.len()
}
}
} else {
quote! {
fn is_empty(&self) -> bool {
true
}

fn len(&self) -> usize {
0
}
}
}
}


fn generate_accessor_setter_methods(struct_name: &Ident, fields_named: &FieldsNamed) -> quote::__private::TokenStream {
let packed_assignments = fields_named.named.iter().map(|field| {
let name = field.ident.as_ref().unwrap();
quote! { #name: self.#name[index].clone() }
});

let set_assignments = fields_named.named.iter().map(|field| {
let name = field.ident.as_ref().unwrap();
quote! { self.#name[index] = value.#name.clone(); }
});

quote! {
fn get(&self, index: usize) -> #struct_name {
#struct_name {
#(#packed_assignments),*
}
}

fn set(&mut self, index: usize, value: #struct_name) {
#(#set_assignments);*
}
}
}


fn generate_conversion_methods(struct_name: &Ident, fields_named: &FieldsNamed) -> quote::__private::TokenStream {
let (
from_interleaved_fields,
to_interleaved_fields_templates
): (Vec<_>, Vec<_>) = fields_named.named.iter().map(|field| {
let name = field.ident.as_ref().unwrap();

let from_interleaved_field = quote! {
#name: packed.iter().map(|x| x.#name.clone()).collect()
};
let to_interleaved_field_template = quote! {
#name: self.#name[index].clone()
};

(from_interleaved_field, to_interleaved_field_template)
}).unzip();

let to_interleaved_method = quote! {
fn to_interleaved(&self) -> Vec<#struct_name> {
(0..self.len())
.map(|index| #struct_name {
#(#to_interleaved_fields_templates),*
})
.collect()
}
};

let conversion_methods = quote! {
fn from_interleaved(packed: Vec<#struct_name>) -> Self {
Self {
#(#from_interleaved_fields),*
}
}
#to_interleaved_method
};

conversion_methods
}
140 changes: 140 additions & 0 deletions crates/bevy_interleave_macros/src/planar.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,140 @@
extern crate proc_macro;

use quote::quote;
use syn::{
Data,
DeriveInput,
Error,
Fields,
FieldsNamed,
Ident,
Result,
};


pub fn generate_planar_struct(input: &DeriveInput) -> Result<quote::__private::TokenStream> {
let name = &input.ident;
let planar_name = Ident::new(&format!("Planar{}", name), name.span());

let fields_struct = if let Data::Struct(ref data_struct) = input.data {
match data_struct.fields {
Fields::Named(ref fields) => fields,
_ => return Err(Error::new_spanned(input, "Unsupported struct type")),
}
} else {
return Err(Error::new_spanned(input, "Planar macro only supports structs"));
};

let field_names = fields_struct.named.iter().map(|f| f.ident.as_ref().unwrap());
let field_types = fields_struct.named.iter().map(|_| quote! { Vec<i32> });

let conversion_methods = generate_conversion_methods(name, fields_struct);
let get_set_methods = generate_accessor_setter_methods(name, fields_struct);
let len_method = generate_len_method(fields_struct);

let expanded = quote! {
pub struct #planar_name {
#(pub #field_names: #field_types,)*
}

impl Planar<#name> for #planar_name {
#conversion_methods
#get_set_methods
#len_method
}
};

Ok(expanded)
}


pub fn generate_len_method(fields_named: &FieldsNamed) -> quote::__private::TokenStream {
if let Some(first_field) = fields_named.named.first() {
let first_field_name = first_field.ident.as_ref().unwrap();
quote! {
fn is_empty(&self) -> bool {
self.#first_field_name.is_empty()
}

fn len(&self) -> usize {
self.#first_field_name.len()
}
}
} else {
quote! {
fn is_empty(&self) -> bool {
true
}

fn len(&self) -> usize {
0
}
}
}
}


pub fn generate_accessor_setter_methods(struct_name: &Ident, fields_named: &FieldsNamed) -> quote::__private::TokenStream {
let packed_assignments = fields_named.named.iter().map(|field| {
let name = field.ident.as_ref().unwrap();
quote! { #name: self.#name[index].clone() }
});

let set_assignments = fields_named.named.iter().map(|field| {
let name = field.ident.as_ref().unwrap();
quote! { self.#name[index] = value.#name.clone(); }
});

quote! {
fn get(&self, index: usize) -> #struct_name {
#struct_name {
#(#packed_assignments),*
}
}

fn set(&mut self, index: usize, value: #struct_name) {
#(#set_assignments);*
}
}
}


pub fn generate_conversion_methods(struct_name: &Ident, fields_named: &FieldsNamed) -> quote::__private::TokenStream {
let (
from_interleaved_fields,
to_interleaved_fields_templates
): (Vec<_>, Vec<_>) = fields_named.named.iter().map(|field| {
let name = field.ident.as_ref().unwrap();

let from_interleaved_field = quote! {
#name: packed.iter().map(|x| x.#name.clone()).collect()
};
let to_interleaved_field_template = quote! {
#name: self.#name[index].clone()
};

(from_interleaved_field, to_interleaved_field_template)
}).unzip();

let to_interleaved_method = quote! {
fn to_interleaved(&self) -> Vec<#struct_name> {
(0..self.len())
.map(|index| #struct_name {
#(#to_interleaved_fields_templates),*
})
.collect()
}
};

let conversion_methods = quote! {
fn from_interleaved(packed: Vec<#struct_name>) -> Self {
Self {
#(#from_interleaved_fields),*
}
}
#to_interleaved_method
};

conversion_methods
}