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use std::convert::TryFrom as _;
extern crate proc_macro;
macro_rules! on_first_ok {
($e:expr) => {
if let Some(r) = $e {
return Ok(Some(r));
}
};
}
mod descriptors;
mod graphics_pipeline;
mod pass;
mod pipeline;
mod repr;
mod stage;
#[proc_macro_attribute]
pub fn descriptors(
attr: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
descriptors::descriptors(attr, item).into()
}
#[proc_macro_attribute]
pub fn shader_repr(
attr: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
repr::shader_repr(attr, item).into()
}
#[proc_macro_attribute]
pub fn pipeline(
attr: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
pipeline::pipeline(attr, item).into()
}
#[proc_macro_attribute]
pub fn pass(
attr: proc_macro::TokenStream,
item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
pass::pass(attr, item).into()
}
#[proc_macro]
pub fn graphics_pipeline_desc(item: proc_macro::TokenStream) -> proc_macro::TokenStream {
graphics_pipeline::graphics_pipeline_desc(item).into()
}
fn take_attributes<T>(
attrs: &mut Vec<syn::Attribute>,
mut f: impl FnMut(&syn::Attribute) -> syn::Result<Option<T>>,
) -> syn::Result<Vec<T>> {
let len = attrs.len();
let mut del = 0;
let mut result = Vec::with_capacity(len);
{
let v = &mut **attrs;
for i in 0..len {
if let Some(value) = f(&v[i])? {
result.push(value);
del += 1;
} else if del > 0 {
v.swap(i - del, i);
}
}
}
if del > 0 {
attrs.truncate(len - del);
}
Ok(result)
}
fn find_unique_attribute<T>(
attrs: &mut Vec<syn::Attribute>,
mut f: impl FnMut(&syn::Attribute) -> syn::Result<Option<T>>,
msg: impl std::fmt::Display,
) -> syn::Result<Option<T>> {
let mut found = None;
for (index, attr) in attrs.iter().enumerate() {
if let Some(v) = f(attr)? {
if found.is_none() {
found = Some((index, v));
} else {
return Err(syn::Error::new_spanned(attr, msg));
}
}
}
match found {
Some((i, v)) => {
attrs.remove(i);
Ok(Some(v))
}
None => Ok(None),
}
}
fn find_unique<I>(
iter: I,
spanned: &impl quote::ToTokens,
msg: impl std::fmt::Display,
) -> syn::Result<Option<I::Item>>
where
I: IntoIterator,
{
let mut iter = iter.into_iter();
match iter.next() {
None => Ok(None),
Some(item) => {
if iter.next().is_none() {
Ok(Some(item))
} else {
Err(syn::Error::new_spanned(spanned, msg))
}
}
}
}
fn get_unique<I>(
iter: I,
spanned: &impl quote::ToTokens,
msg: impl std::fmt::Display,
) -> syn::Result<I::Item>
where
I: IntoIterator,
{
let mut iter = iter.into_iter();
if let Some(item) = iter.next() {
if iter.next().is_none() {
return Ok(item);
}
}
Err(syn::Error::new_spanned(spanned, msg))
}
fn validate_member(member: &syn::Member, item_struct: &syn::ItemStruct) -> syn::Result<u32> {
match (member, &item_struct.fields) {
(syn::Member::Named(member_ident), syn::Fields::Named(fields)) => {
for (index, field) in fields.named.iter().enumerate() {
let field_ident = field.ident.as_ref().unwrap();
if *field_ident == *member_ident {
return u32::try_from(index)
.map_err(|_| syn::Error::new_spanned(member, "Too many fields"));
}
}
Err(syn::Error::new_spanned(
member,
"Member not found in structure",
))
}
(syn::Member::Unnamed(unnamed), syn::Fields::Unnamed(fields)) => {
let valid =
usize::try_from(unnamed.index).map_or(false, |index| index < fields.unnamed.len());
if !valid {
Err(syn::Error::new_spanned(
member,
"Member index is out of bounds",
))
} else {
Ok(unnamed.index)
}
}
(syn::Member::Named(named), syn::Fields::Unnamed(_)) => Err(syn::Error::new_spanned(
named,
"Expected unnamed member for tuple-struct",
)),
(syn::Member::Unnamed(unnamed), syn::Fields::Named(_)) => Err(syn::Error::new_spanned(
unnamed,
"Expected named member for struct",
)),
(member, syn::Fields::Unit) => Err(syn::Error::new_spanned(
member,
"Unexpected member reference for unit-struct",
)),
}
}