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//! This crate adds support for deriving [`AssetCollection`]
//!
//! You do not have to use it directly. Just import [`AssetCollection`] from `bevy_asset_loader`
//! and use `#[derive(AssetCollection)]` to derive the trait.
#![forbid(unsafe_code)]
#![warn(unused_imports)]
extern crate proc_macro;
mod assets;
use proc_macro::TokenStream;
use std::option::Option::Some;
use std::result::Result::{Err, Ok};
use crate::assets::*;
use proc_macro2::Ident;
use quote::{quote, quote_spanned, ToTokens, TokenStreamExt};
use syn::punctuated::Punctuated;
#[cfg(any(feature = "2d", feature = "3d"))]
use syn::ExprPath;
use syn::{Data, Expr, ExprLit, Field, Fields, Index, Lit, LitStr, Meta, Token};
/// Derive macro for [`AssetCollection`]
///
/// The helper attribute ``asset`` can be used to define the path to the asset file
/// and other asset options.
#[proc_macro_derive(AssetCollection, attributes(asset))]
pub fn asset_collection_derive(input: TokenStream) -> TokenStream {
let ast = syn::parse(input).unwrap();
impl_asset_collection(ast)
.unwrap_or_else(to_compile_errors)
.into()
}
pub(crate) const ASSET_ATTRIBUTE: &str = "asset";
pub(crate) const PATH_ATTRIBUTE: &str = "path";
pub(crate) const KEY_ATTRIBUTE: &str = "key";
pub(crate) const OPTIONAL_ATTRIBUTE: &str = "optional";
pub(crate) struct TextureAtlasAttribute;
impl TextureAtlasAttribute {
pub const ATTRIBUTE_NAME_DEPRECATED: &'static str = "texture_atlas";
pub const ATTRIBUTE_NAME: &'static str = "texture_atlas_layout";
pub const TILE_SIZE_X: &'static str = "tile_size_x";
pub const TILE_SIZE_Y: &'static str = "tile_size_y";
pub const COLUMNS: &'static str = "columns";
pub const ROWS: &'static str = "rows";
#[allow(dead_code)]
pub const PADDING_X: &'static str = "padding_x";
#[allow(dead_code)]
pub const PADDING_Y: &'static str = "padding_y";
#[allow(dead_code)]
pub const OFFSET_X: &'static str = "offset_x";
#[allow(dead_code)]
pub const OFFSET_Y: &'static str = "offset_y";
}
pub(crate) struct ImageAttribute;
impl ImageAttribute {
pub const ATTRIBUTE_NAME: &'static str = "image";
#[allow(dead_code)]
pub const SAMPLER: &'static str = "sampler";
}
pub(crate) const COLLECTION_ATTRIBUTE: &str = "collection";
pub(crate) const PATHS_ATTRIBUTE: &str = "paths";
pub(crate) const TYPED_ATTRIBUTE: &str = "typed";
pub(crate) const MAPPED_ATTRIBUTE: &str = "mapped";
pub(crate) const STANDARD_MATERIAL_ATTRIBUTE: &str = "standard_material";
fn impl_asset_collection(
ast: syn::DeriveInput,
) -> Result<proc_macro2::TokenStream, Vec<syn::Error>> {
let name = &ast.ident;
let mut from_world_fields: Vec<Ident> = vec![];
let mut assets: Vec<AssetField> = vec![];
if let Data::Struct(ref data_struct) = ast.data {
if let Fields::Named(ref named_fields) = data_struct.fields {
let mut compile_errors = vec![];
for field in named_fields.named.iter() {
match parse_field(field) {
Ok(asset) => assets.push(asset),
Err(errors) => {
for error in errors {
match error {
ParseFieldError::NoAttributes => {
from_world_fields.push(field.clone().ident.unwrap());
}
ParseFieldError::KeyAttributeStandsAlone => {
compile_errors.push(syn::Error::new_spanned(
field.into_token_stream(),
"The 'key' attribute cannot be combined with any other asset defining attributes",
));
}
ParseFieldError::OnlyDynamicCanBeOptional => {
compile_errors.push(syn::Error::new_spanned(
field.into_token_stream(),
"Only a dynamic asset (with 'key' attribute) can be optional",
));
}
ParseFieldError::MissingAttributes(missing_attributes) => {
compile_errors.push(syn::Error::new_spanned(
field.into_token_stream(),
format!(
"Field is missing asset attributes: {}",
missing_attributes.join(", ")
),
));
}
ParseFieldError::WrongAttributeType(token_stream, expected) => {
compile_errors.push(syn::Error::new_spanned(
token_stream,
format!("Wrong attribute type. Expected '{expected}'"),
));
}
ParseFieldError::UnknownAttributeType(token_stream) => {
compile_errors.push(syn::Error::new_spanned(
token_stream,
"Unknown attribute type",
));
}
ParseFieldError::UnknownAttribute(token_stream) => {
compile_errors.push(syn::Error::new_spanned(
token_stream,
"Unknown attribute",
));
}
ParseFieldError::Missing2dFeature(token_stream) => {
compile_errors.push(syn::Error::new_spanned(
token_stream,
"This attribute requires the '2d' feature",
));
}
ParseFieldError::Missing3dFeature(token_stream) => {
compile_errors.push(syn::Error::new_spanned(
token_stream,
"This attribute requires the '3d' feature",
));
}
ParseFieldError::Missing2dOr3dFeature(token_stream) => {
compile_errors.push(syn::Error::new_spanned(
token_stream,
"This attribute requires the '3d' or '2d' feature",
));
}
ParseFieldError::PathAndPathsAreExclusive => {
compile_errors.push(syn::Error::new_spanned(
field.into_token_stream(),
"Either specify 'path' OR 'paths'",
));
}
}
}
}
}
}
if !compile_errors.is_empty() {
return Err(compile_errors);
}
} else {
return Err(vec![syn::Error::new_spanned(
data_struct.fields.clone().into_token_stream(),
"only named fields are supported to derive AssetCollection",
)]);
}
} else {
return Err(vec![syn::Error::new_spanned(
&ast.into_token_stream(),
"AssetCollection can only be derived for a struct",
)]);
}
let asset_loading = assets.iter().fold(quote!(), |token_stream, asset| {
asset.attach_token_stream_for_loading(token_stream)
});
let load_function = quote! {
fn load(world: &mut ::bevy::ecs::world::World) -> Vec<::bevy::prelude::UntypedHandle> {
let cell = world.cell();
let asset_server = cell.get_resource::<::bevy::prelude::AssetServer>().expect("Cannot get AssetServer");
let asset_keys = cell.get_resource::<bevy_asset_loader::prelude::DynamicAssets>().expect("Cannot get bevy_asset_loader::prelude::DynamicAssets");
let mut handles = vec![];
#asset_loading
handles
}
};
let prepare_from_world = from_world_fields.iter().fold(
quote!(),
|es, ident| quote_spanned! {ident.span() => #es ::bevy::ecs::world::FromWorld::from_world(world),},
);
let mut asset_creation = assets.iter().fold(quote!(), |token_stream, asset| {
asset.attach_token_stream_for_creation(token_stream, name.to_string())
});
let mut index = 0;
asset_creation.append_all(from_world_fields.iter().fold(quote!(), |es, ident| {
let index_ident = Index::from(index);
let tokens = quote! (#es #ident : from_world_fields.#index_ident,);
index += 1;
tokens
}));
let create_function = quote! {
fn create(world: &mut ::bevy::ecs::world::World) -> Self {
let from_world_fields = (#prepare_from_world);
world.resource_scope(
|world, asset_keys: ::bevy::prelude::Mut<::bevy_asset_loader::dynamic_asset::DynamicAssets>| {
#name {
#asset_creation
}
},
)
}
};
let impl_asset_collection = quote! {
#[automatically_derived]
#[allow(unused_variables)]
impl AssetCollection for #name {
#create_function
#load_function
}
};
Ok(impl_asset_collection)
}
#[derive(Debug)]
enum ParseFieldError {
NoAttributes,
KeyAttributeStandsAlone,
OnlyDynamicCanBeOptional,
PathAndPathsAreExclusive,
WrongAttributeType(proc_macro2::TokenStream, &'static str),
UnknownAttributeType(proc_macro2::TokenStream),
UnknownAttribute(proc_macro2::TokenStream),
MissingAttributes(Vec<String>),
#[allow(dead_code)]
Missing2dFeature(proc_macro2::TokenStream),
#[allow(dead_code)]
Missing3dFeature(proc_macro2::TokenStream),
#[allow(dead_code)]
Missing2dOr3dFeature(proc_macro2::TokenStream),
}
fn parse_field(field: &Field) -> Result<AssetField, Vec<ParseFieldError>> {
let mut builder = AssetBuilder::default();
let mut errors = vec![];
for attr in field
.attrs
.iter()
.filter(|attribute| attribute.path().is_ident(ASSET_ATTRIBUTE))
{
let asset_meta_list = attr.parse_args_with(Punctuated::<Meta, Token![,]>::parse_terminated);
builder.field_ident = Some(field.clone().ident.unwrap());
for attribute in asset_meta_list.unwrap() {
match attribute {
Meta::List(meta_list)
if meta_list
.path
.is_ident(TextureAtlasAttribute::ATTRIBUTE_NAME)
|| meta_list
.path
.is_ident(TextureAtlasAttribute::ATTRIBUTE_NAME_DEPRECATED) =>
{
#[cfg(not(feature = "2d"))]
errors.push(ParseFieldError::Missing2dFeature(
meta_list.into_token_stream(),
));
#[cfg(feature = "2d")]
{
let texture_atlas_meta_list = meta_list
.parse_args_with(Punctuated::<Meta, Token![,]>::parse_terminated);
for attribute in texture_atlas_meta_list.unwrap() {
match attribute {
Meta::NameValue(named_value) => {
let path = named_value.path.get_ident().unwrap().clone();
if path == TextureAtlasAttribute::TILE_SIZE_X {
if let Expr::Lit(ExprLit {
lit: Lit::Float(width),
..
}) = &named_value.value
{
builder.tile_size_x =
Some(width.base10_parse::<f32>().unwrap());
} else {
errors.push(ParseFieldError::WrongAttributeType(
named_value.into_token_stream(),
"float",
));
}
} else if path == TextureAtlasAttribute::TILE_SIZE_Y {
if let Expr::Lit(ExprLit {
lit: Lit::Float(height),
..
}) = &named_value.value
{
builder.tile_size_y =
Some(height.base10_parse::<f32>().unwrap());
} else {
errors.push(ParseFieldError::WrongAttributeType(
named_value.into_token_stream(),
"float",
));
}
} else if path == TextureAtlasAttribute::COLUMNS {
if let Expr::Lit(ExprLit {
lit: Lit::Int(columns),
..
}) = &named_value.value
{
builder.columns =
Some(columns.base10_parse::<usize>().unwrap());
} else {
errors.push(ParseFieldError::WrongAttributeType(
named_value.into_token_stream(),
"integer",
));
}
} else if path == TextureAtlasAttribute::ROWS {
if let Expr::Lit(ExprLit {
lit: Lit::Int(rows),
..
}) = &named_value.value
{
builder.rows =
Some(rows.base10_parse::<usize>().unwrap());
} else {
errors.push(ParseFieldError::WrongAttributeType(
named_value.into_token_stream(),
"integer",
));
}
} else if path == TextureAtlasAttribute::PADDING_X {
if let Expr::Lit(ExprLit {
lit: Lit::Float(padding_x),
..
}) = &named_value.value
{
builder.padding_x =
Some(padding_x.base10_parse::<f32>().unwrap());
} else {
errors.push(ParseFieldError::WrongAttributeType(
named_value.into_token_stream(),
"float",
));
}
} else if path == TextureAtlasAttribute::PADDING_Y {
if let Expr::Lit(ExprLit {
lit: Lit::Float(padding_y),
..
}) = &named_value.value
{
builder.padding_y =
Some(padding_y.base10_parse::<f32>().unwrap());
} else {
errors.push(ParseFieldError::WrongAttributeType(
named_value.into_token_stream(),
"float",
));
}
} else if path == TextureAtlasAttribute::OFFSET_X {
if let Expr::Lit(ExprLit {
lit: Lit::Float(offset_x),
..
}) = &named_value.value
{
builder.offset_x =
Some(offset_x.base10_parse::<f32>().unwrap());
} else {
errors.push(ParseFieldError::WrongAttributeType(
named_value.into_token_stream(),
"float",
));
}
} else if path == TextureAtlasAttribute::OFFSET_Y {
if let Expr::Lit(ExprLit {
lit: Lit::Float(offset_y),
..
}) = &named_value.value
{
builder.offset_y =
Some(offset_y.base10_parse::<f32>().unwrap());
} else {
errors.push(ParseFieldError::WrongAttributeType(
named_value.into_token_stream(),
"float",
));
}
} else {
errors.push(ParseFieldError::UnknownAttribute(
named_value.into_token_stream(),
));
}
}
_ => {
errors.push(ParseFieldError::UnknownAttributeType(
attribute.into_token_stream(),
));
}
}
}
}
}
Meta::List(meta_list) if meta_list.path.is_ident(COLLECTION_ATTRIBUTE) => {
let collection_meta_list =
meta_list.parse_args_with(Punctuated::<Meta, Token![,]>::parse_terminated);
builder.is_collection = true;
for attribute in collection_meta_list.unwrap() {
match attribute {
Meta::Path(meta_path) => {
let path = meta_path.get_ident().unwrap().clone();
if path == TYPED_ATTRIBUTE {
builder.is_typed = true;
} else if path == MAPPED_ATTRIBUTE {
builder.is_mapped = true;
} else {
errors.push(ParseFieldError::UnknownAttribute(
meta_path.into_token_stream(),
));
}
}
_ => {
errors.push(ParseFieldError::UnknownAttributeType(
attribute.into_token_stream(),
));
}
}
}
}
Meta::List(meta_list) if meta_list.path.is_ident(PATHS_ATTRIBUTE) => {
let paths_meta_list = meta_list
.parse_args_with(Punctuated::<LitStr, Token![,]>::parse_terminated);
let mut paths = vec![];
for path in paths_meta_list.unwrap() {
paths.push(path.value());
}
builder.asset_paths = Some(paths);
}
Meta::List(meta_list)
if meta_list.path.is_ident(ImageAttribute::ATTRIBUTE_NAME) =>
{
#[cfg(all(not(feature = "2d"), not(feature = "3d")))]
errors.push(ParseFieldError::Missing2dOr3dFeature(
meta_list.into_token_stream(),
));
#[cfg(any(feature = "2d", feature = "3d"))]
{
let image_meta_list = meta_list
.parse_args_with(Punctuated::<Meta, Token![,]>::parse_terminated);
for attribute in image_meta_list.unwrap() {
match attribute {
Meta::NameValue(named_value) => {
let path = named_value.path.get_ident().unwrap().clone();
if path == ImageAttribute::SAMPLER {
if let Expr::Path(ExprPath { path, .. }) =
&named_value.value
{
let sampler_result = SamplerType::try_from(
path.get_ident().unwrap().to_string(),
);
if let Ok(sampler) = sampler_result {
builder.sampler = Some(sampler);
} else {
errors.push(ParseFieldError::UnknownAttribute(
named_value.value.into_token_stream(),
));
}
} else {
errors.push(ParseFieldError::WrongAttributeType(
named_value.into_token_stream(),
"path",
));
}
}
}
_ => {
errors.push(ParseFieldError::UnknownAttributeType(
attribute.into_token_stream(),
));
}
}
}
}
}
Meta::List(meta_list) => errors.push(ParseFieldError::UnknownAttribute(
meta_list.into_token_stream(),
)),
Meta::NameValue(named_value) if named_value.path.is_ident(PATH_ATTRIBUTE) => {
if let Expr::Lit(ExprLit {
lit: Lit::Str(path),
..
}) = &named_value.value
{
builder.asset_path = Some(path.value());
} else {
errors.push(ParseFieldError::WrongAttributeType(
named_value.into_token_stream(),
"str",
));
}
}
Meta::NameValue(named_value) if named_value.path.is_ident(KEY_ATTRIBUTE) => {
if let Expr::Lit(ExprLit {
lit: Lit::Str(key), ..
}) = &named_value.value
{
builder.key = Some(key.value());
} else {
errors.push(ParseFieldError::WrongAttributeType(
named_value.into_token_stream(),
"str",
));
}
}
Meta::NameValue(named_value) => errors.push(ParseFieldError::UnknownAttribute(
named_value.into_token_stream(),
)),
Meta::Path(meta_path) if meta_path.is_ident(STANDARD_MATERIAL_ATTRIBUTE) => {
#[cfg(not(feature = "3d"))]
errors.push(ParseFieldError::Missing3dFeature(
meta_path.into_token_stream(),
));
#[cfg(feature = "3d")]
{
builder.is_standard_material = true;
}
}
Meta::Path(meta_path) if meta_path.is_ident(OPTIONAL_ATTRIBUTE) => {
builder.is_optional = true;
}
Meta::Path(meta_path) if meta_path.is_ident(COLLECTION_ATTRIBUTE) => {
builder.is_collection = true;
}
Meta::Path(meta_path) if meta_path.is_ident(TYPED_ATTRIBUTE) => {
builder.is_typed = true;
}
Meta::Path(meta_path) => errors.push(ParseFieldError::UnknownAttribute(
meta_path.into_token_stream(),
)),
}
}
}
if !errors.is_empty() {
return Err(errors);
}
builder.build()
}
fn to_compile_errors(errors: Vec<syn::Error>) -> proc_macro2::TokenStream {
let compile_errors = errors.iter().map(syn::Error::to_compile_error);
quote!(#(#compile_errors)*)
}