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|
use proc_macro::TokenStream;
use quote::quote;
use syn::{
Attribute, Ident, LitStr, Token, braced,
parse::{Parse, ParseStream, Result},
parse_macro_input,
punctuated::Punctuated,
};
struct Registry {
name: Ident,
items: Vec<RegistryItem>,
attrs: Vec<Attribute>,
}
struct RegistryItem {
attrs: Vec<Attribute>,
name: Ident,
id: String,
}
impl Parse for RegistryItem {
// Air => "minecraft:air"
fn parse(input: ParseStream) -> Result<Self> {
// parse annotations like #[default]
let attrs = input.call(Attribute::parse_outer).unwrap_or_default();
let name = input.parse()?;
input.parse::<Token![=>]>()?;
let id = input.parse::<LitStr>()?.value();
Ok(RegistryItem { attrs, name, id })
}
}
impl Parse for Registry {
fn parse(input: ParseStream) -> Result<Self> {
// enum BlockKind {
// Air => "minecraft:air",
// Stone => "minecraft:stone"
// }
// this also includes docs
let attrs = input.call(Attribute::parse_outer).unwrap_or_default();
input.parse::<Token![enum]>()?;
let name = input.parse()?;
let content;
braced!(content in input);
let items: Punctuated<RegistryItem, _> =
content.parse_terminated(RegistryItem::parse, Token![,])?;
Ok(Registry {
name,
items: items.into_iter().collect(),
attrs,
})
}
}
#[proc_macro]
pub fn registry(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as Registry);
let name = input.name;
let mut generated = quote! {};
// enum BlockKind {
// Air = 0,
// Stone,
// }
let mut enum_items = quote! {};
for (i, item) in input.items.iter().enumerate() {
let attrs = &item.attrs;
let name = &item.name;
let protocol_id = i as u32;
enum_items.extend(quote! {
#(#attrs)*
#name = #protocol_id,
});
}
let attributes = input.attrs;
generated.extend(quote! {
#(#attributes)*
#[derive(azalea_buf::AzBuf, Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
#[repr(u32)]
pub enum #name {
#enum_items
}
});
let max_id = input.items.len() as u32 - 1;
let doc_0 = format!("Transmutes a u32 to a {name}.");
let doc_1 = format!("The `id` should be at most {max_id}.");
generated.extend(quote! {
impl #name {
#[doc = #doc_0]
///
/// # Safety
#[doc = #doc_1]
#[inline]
pub unsafe fn from_u32_unchecked(id: u32) -> Self {
std::mem::transmute::<u32, #name>(id)
}
#[inline]
pub const fn is_valid_id(id: u32) -> bool {
id <= #max_id
}
}
impl crate::Registry for #name {
fn from_u32(value: u32) -> Option<Self> {
if Self::is_valid_id(value) {
Some(unsafe { Self::from_u32_unchecked(value) })
} else {
None
}
}
fn to_u32(&self) -> u32 {
*self as u32
}
}
});
let doc_0 = format!("Safely transmutes a u32 to a {name}.");
generated.extend(quote! {
impl TryFrom<u32> for #name {
type Error = ();
#[doc = #doc_0]
fn try_from(id: u32) -> Result<Self, Self::Error> {
if let Some(value) = crate::Registry::from_u32(id) {
Ok(value)
} else {
Err(())
}
}
}
});
// Display that uses registry ids
let mut to_str_items = quote! {};
let mut from_str_items = quote! {};
for item in &input.items {
let name = &item.name;
let id = &item.id;
to_str_items.extend(quote! {
Self::#name => concat!("minecraft:", #id),
});
from_str_items.extend(quote! {
#id => Ok(Self::#name),
});
}
generated.extend(quote! {
impl #name {
/// Convert the value to a stringified identifier, formatted like
/// `"minecraft:air"`.
pub fn to_str(&self) -> &'static str {
match self {
#to_str_items
}
}
}
impl std::fmt::Display for #name {
/// Convert the value to a stringified identifier, formatted like
/// `"minecraft:air"`.
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.to_str())
}
}
impl<'a> TryFrom<&'a crate::Identifier> for #name {
type Error = ();
fn try_from(ident: &'a crate::Identifier) -> Result<Self, Self::Error> {
if ident.namespace() != "minecraft" { return Err(()) }
match ident.path() {
#from_str_items
_ => return Err(()),
}
}
}
impl<'a> From<#name> for crate::Identifier {
fn from(value: #name) -> Self {
Self::new(value.to_str())
}
}
/// Parse the value from a stringified identifier, formatted like
/// either `"air"` or `"minecraft:air"`.
impl std::str::FromStr for #name {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
Self::try_from(&crate::Identifier::new(s))
}
}
#[cfg(feature = "serde")]
impl serde::Serialize for #name {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
serializer.serialize_str(&self.to_string())
}
}
#[cfg(feature = "serde")]
impl<'de> serde::Deserialize<'de> for #name {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
let s = String::deserialize(deserializer)?;
s.parse().map_err(|_| serde::de::Error::custom(
format!("{s:?} is not a valid {name}", s = s, name = stringify!(#name))
))
}
}
impl simdnbt::FromNbtTag for #name {
fn from_nbt_tag(tag: simdnbt::borrow::NbtTag) -> Option<Self> {
let v = tag.string()?;
std::str::FromStr::from_str(&v.to_str()).ok()
}
}
impl simdnbt::ToNbtTag for #name {
fn to_nbt_tag(self) -> simdnbt::owned::NbtTag {
simdnbt::owned::NbtTag::String(self.to_string().into())
}
}
});
generated.into()
}
|
