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Copy pathentity_metadata.rs
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Copy pathentity_metadata.rs
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335 lines (273 loc) · 8.78 KB
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use proc_macro::TokenStream;
use proc_macro2::Ident;
use proc_macro2::Span;
use quote::quote;
use std::collections::HashMap;
use syn::braced;
use syn::parenthesized;
use syn::parse::{Parse, ParseBuffer};
use syn::Error;
use syn::Lit;
use syn::Token;
#[derive(Clone)]
struct EntityMetadata {
ident: Ident,
variants: HashMap<Ident, Variant>,
}
impl Parse for EntityMetadata {
fn parse(input: &ParseBuffer) -> Result<Self, Error> {
let ident = input.parse()?;
input.parse::<Token![,]>()?;
let mut variants = HashMap::new();
while let Ok(variant) = input.parse::<Variant>() {
variants.insert(variant.ident.clone(), variant);
input.parse::<Token![,]>()?;
}
Ok(Self { ident, variants })
}
}
#[derive(Clone)]
struct Variant {
ident: Ident,
extends: Option<Ident>,
entries: Vec<Entry>,
}
impl Parse for Variant {
fn parse(input: &ParseBuffer) -> Result<Self, Error> {
let ident = input.parse()?;
let extends = if input.parse::<Token![:]>().is_ok() {
let ident = input.parse()?;
Some(ident)
} else {
None
};
let content;
braced!(content in input);
let mut entries = vec![];
while let Ok(entry) = content.parse::<Entry>() {
entries.push(entry);
}
Ok(Self {
ident,
extends,
entries,
})
}
}
#[derive(Clone)]
struct Entry {
ty: EntryType,
name: Ident,
index: u8,
default: Option<Lit>,
}
impl Parse for Entry {
fn parse(input: &ParseBuffer) -> Result<Self, Error> {
let name = input.parse()?;
let _ = input.parse::<Token![:]>()?;
let ty = input.parse()?;
let paren;
parenthesized!(paren in input);
let default = match paren.parse() {
Ok(val) => Some(val),
Err(_) => None,
};
let _ = input.parse::<Token![=]>()?;
let index = match input.parse::<Lit>()? {
Lit::Int(val) => val.base10_parse()?,
_ => panic!("Index not a `u8`"),
};
let _ = input.parse::<Token![,]>()?;
Ok(Self {
ty,
name,
index,
default,
})
}
}
#[derive(PartialEq, Debug, Display, EnumString, Copy, Clone)]
enum EntryType {
Byte,
VarInt,
Float,
String,
Slot,
Boolean,
OptUuid,
Position,
}
impl Parse for EntryType {
fn parse(input: &ParseBuffer) -> Result<Self, Error> {
let ty = input.parse::<proc_macro2::Ident>()?;
Ok(EntryType::from_rust_type(&ty.to_string()))
}
}
impl EntryType {
fn rust_type(self) -> &'static str {
match self {
EntryType::Byte => "u8",
EntryType::VarInt => "i32",
EntryType::Float => "f32",
EntryType::String => "String",
EntryType::Slot => "Slot",
EntryType::Boolean => "bool",
EntryType::OptUuid => "OptUuid",
EntryType::Position => "BlockPosition",
}
}
fn from_rust_type(ty: &str) -> Self {
match ty {
"u8" => EntryType::Byte,
"VarInt" => EntryType::VarInt,
"f32" => EntryType::Float,
"String" => EntryType::String,
"bool" => EntryType::Boolean,
"Slot" => EntryType::Slot,
"OptUuid" => EntryType::OptUuid,
"BlockPosition" => EntryType::Position,
_ => panic!("Invalid entry type {}", ty),
}
}
}
#[allow(clippy::cognitive_complexity)] // FIXME: clean this function up
pub fn entity_metadata(input: TokenStream) -> TokenStream {
let input: EntityMetadata = syn::parse_macro_input!(input);
let mut structs = vec![];
let mut enum_variants = vec![];
let mut to_raw_metadata_arms = vec![];
let mut to_full_raw_metadata_arms = vec![];
let enum_ident = input.ident.clone();
for variant in input.variants.values() {
let entries = get_metadata_entries(&input, variant.clone());
let variant_ident = &variant.ident;
let mut struct_fields = vec![];
let mut struct_impl = vec![];
let mut to_raw_metadata = vec![];
let mut to_full_raw_metadata = vec![];
let mut new_fn_parameters = vec![];
let mut new_fn_contents = vec![];
let mut default_entries = vec![];
for entry in entries {
let entry_ident = entry.name;
let ty_enum = entry.ty;
let ty = ty_enum.rust_type();
let ty_ident = Ident::new(ty, Span::call_site());
let is_dirty_name = format!("__is_dirty_{}", entry_ident);
let is_dirty_ident = Ident::new(&is_dirty_name, Span::call_site());
struct_fields.push(quote! {
#entry_ident: #ty_ident,
#is_dirty_ident: bool,
});
let set_fn_ident = Ident::new(&format!("set_{}", entry_ident), Span::call_site());
let get_fn_ident = entry_ident.clone();
struct_impl.push(quote! {
pub fn #set_fn_ident(&mut self, val: #ty_ident) {
self.#entry_ident = val;
self.#is_dirty_ident = true;
}
pub fn #get_fn_ident(&self) -> #ty_ident {
self.#entry_ident.clone()
}
});
let pass_reference = ty_enum == EntryType::Slot;
let index = entry.index;
let set_expr = if pass_reference {
quote! { meta.set(#index, self.#entry_ident.clone()); }
} else {
quote! { meta.set(#index, self.#entry_ident); }
};
to_raw_metadata.push(quote! {
if self.#is_dirty_ident {
#set_expr
self.#is_dirty_ident = false;
}
});
to_full_raw_metadata.push(quote! {
#set_expr
});
new_fn_parameters.push(quote! {
#entry_ident: #ty_ident
});
new_fn_contents.push(quote! {
#entry_ident,
#is_dirty_ident: true,
});
to_raw_metadata_arms.push(quote! {
#enum_ident::#variant_ident(meta) => meta.to_raw_metadata(),
});
to_full_raw_metadata_arms.push(quote! {
#enum_ident::#variant_ident(meta) => meta.to_full_raw_metadata(),
});
default_entries.push(match entry.default {
Some(default) => quote! { #entry_ident: #default, #is_dirty_ident: false, },
None => quote! { #entry_ident: Default::default(), #is_dirty_ident: false, },
});
}
struct_impl.push(quote! {
pub fn new(#(#new_fn_parameters),*) -> Self {
Self {
#(#new_fn_contents)*
}
}
fn to_raw_metadata(&mut self) -> EntityMetadata {
let mut meta = EntityMetadata::new();
#(#to_raw_metadata)*
meta
}
fn to_full_raw_metadata(&self) -> EntityMetadata {
let mut meta = EntityMetadata::new();
#(#to_full_raw_metadata)*
meta
}
});
structs.push(quote! {
#[derive(Clone, Debug)]
pub struct #variant_ident {
#(#struct_fields)*
}
impl #variant_ident {
#(#struct_impl)*
}
impl Default for #variant_ident {
fn default() -> Self {
Self {
#(#default_entries)*
}
}
}
});
enum_variants.push(quote! {
#variant_ident(#variant_ident),
})
}
let result = quote! {
#[derive(Clone, Debug)]
pub enum #enum_ident {
#(#enum_variants)*
}
impl #enum_ident {
pub fn to_raw_metadata(&mut self) -> EntityMetadata {
match self {
#(#to_raw_metadata_arms)*
}
}
pub fn to_full_raw_metadata(&self) -> EntityMetadata {
match self {
#(#to_full_raw_metadata_arms)*
}
}
}
#(#structs)*
};
result.into()
}
fn get_metadata_entries(metadata: &EntityMetadata, variant: Variant) -> Vec<Entry> {
let mut entries = vec![];
if let Some(inherits_from) = variant.extends.as_ref() {
let inherits_from = &metadata.variants[inherits_from];
entries.extend(get_metadata_entries(metadata, inherits_from.clone()).into_iter());
}
entries.extend(variant.entries.into_iter());
entries
}
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