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extern crate proc_macro;
#[macro_use]
extern crate strum_macros;
mod entity_metadata;
use heck::SnakeCase;
use lazy_static::lazy_static;
use proc_macro::TokenStream;
use quote::quote;
use std::collections::HashMap;
use syn::export::Span;
use syn::Data;
use syn::Ident;
use syn::Type;
use syn::{parse_macro_input, DeriveInput};
#[proc_macro_derive(AsAny)]
pub fn derive_as_any(_item: TokenStream) -> TokenStream {
let parsed: DeriveInput = parse_macro_input!(_item as DeriveInput);
let name = &parsed.ident;
let result = quote! {
impl AsAny for #name {
fn as_any(&self) -> &Any {
self
}
}
};
result.into()
}
#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
enum PacketParameterType {
Varint,
Varlong,
String,
U64,
U32,
U16,
U8,
I64,
I32,
I16,
I8,
Position,
Boolean,
F32,
F64,
Uuid,
Nbt,
Slot,
EntityMetadata,
}
lazy_static! {
static ref PARAMETER_MAPPINGS: HashMap<&'static str, PacketParameterType> = {
let mut m = HashMap::new();
m.insert("VarInt", PacketParameterType::Varint);
m.insert("VarLong", PacketParameterType::Varlong);
m.insert("String", PacketParameterType::String);
m.insert("u64", PacketParameterType::U64);
m.insert("u32", PacketParameterType::U32);
m.insert("u16", PacketParameterType::U16);
m.insert("u8", PacketParameterType::U8);
m.insert("i64", PacketParameterType::I64);
m.insert("i32", PacketParameterType::I32);
m.insert("i16", PacketParameterType::I16);
m.insert("i8", PacketParameterType::I8);
m.insert("BlockPosition", PacketParameterType::Position);
m.insert("bool", PacketParameterType::Boolean);
m.insert("f32", PacketParameterType::F32);
m.insert("f64", PacketParameterType::F64);
m.insert("Uuid", PacketParameterType::Uuid);
m.insert("NbtTag", PacketParameterType::Nbt);
m.insert("Slot", PacketParameterType::Slot);
m.insert("EntityMetadata", PacketParameterType::EntityMetadata);
m
};
static ref FUNCTION_MAPPINGS: HashMap<PacketParameterType, &'static str> = {
let mut m = HashMap::new();
m.insert("var_int", PacketParameterType::Varint);
m.insert("var_long", PacketParameterType::Varlong);
m.insert("string", PacketParameterType::String);
m.insert("u64", PacketParameterType::U64);
m.insert("u32", PacketParameterType::U32);
m.insert("u16", PacketParameterType::U16);
m.insert("u8", PacketParameterType::U8);
m.insert("i64", PacketParameterType::I64);
m.insert("i32", PacketParameterType::I32);
m.insert("i16", PacketParameterType::I16);
m.insert("i8", PacketParameterType::I8);
m.insert("position", PacketParameterType::Position);
m.insert("bool", PacketParameterType::Boolean);
m.insert("f32", PacketParameterType::F32);
m.insert("f64", PacketParameterType::F64);
m.insert("uuid", PacketParameterType::Uuid);
m.insert("nbt", PacketParameterType::Nbt);
m.insert("slot", PacketParameterType::Slot);
m.insert("metadata", PacketParameterType::EntityMetadata);
// I wrote them in the wrong order, so I'm just going to reverse
// the map.
let mut reversed = HashMap::new();
for (key, value) in m {
reversed.insert(value, key);
}
reversed
};
}
#[proc_macro_derive(Packet)]
pub fn derive_packet(_item: TokenStream) -> TokenStream {
let item: DeriveInput = parse_macro_input!(_item as DeriveInput);
let ident = item.ident.clone();
let fields = match &item.data {
Data::Struct(st) => &st.fields,
_ => panic!("Not a struct"),
};
let mut write_code = vec![];
let mut read_code = vec![];
for field in fields {
let field_name = field.ident.as_ref().unwrap();
let ty = match &field.ty {
Type::Path(path) => &path.path.segments,
_ => panic!("Not a path field"),
};
if ty.len() != 1 {
panic!("Must not use paths");
}
let ty_ident = &ty.first().unwrap().ident;
let parameter_type = PARAMETER_MAPPINGS
.get(ty_ident.to_string().as_str())
.unwrap_or_else(|| {
panic!(
"Couldn't find packet parameter type corresponding to {}",
ty_ident
)
});
let function_ident = Ident::new(
FUNCTION_MAPPINGS.get(parameter_type).unwrap(),
Span::call_site(),
);
let write_fn_ident = Ident::new(&format!("push_{}", function_ident), Span::call_site());
let read_fn_ident = Ident::new(&format!("try_get_{}", function_ident), Span::call_site());
let use_ref = {
vec![
PacketParameterType::Position,
PacketParameterType::String,
PacketParameterType::Uuid,
PacketParameterType::Nbt,
PacketParameterType::EntityMetadata,
]
.contains(parameter_type)
};
let write;
if use_ref {
write = quote! {
buf.#write_fn_ident(&self.#field_name);
};
} else {
write = quote! {
buf.#write_fn_ident(self.#field_name);
}
}
let read;
read = quote! {
self.#field_name = buf.#read_fn_ident()?;
};
write_code.push(write);
read_code.push(read);
}
let r = quote! {
impl Packet for #ident {
fn read_from(&mut self, mut buf: &mut Cursor<&[u8]>) -> anyhow::Result<()> {
#(#read_code)*
Ok(())
}
fn write_to(&self, buf: &mut BytesMut) {
#(#write_code)*
}
fn ty(&self) -> PacketType {
PacketType::#ident
}
fn ty_sized() -> PacketType where Self: Sized {
PacketType::#ident
}
fn box_clone(&self) -> Box<dyn Packet> {
Box::new((*self).clone())
}
}
};
r.into()
}
#[proc_macro_derive(FromSnakeCase)]
pub fn derive_from_snake_case(input: TokenStream) -> TokenStream {
let input: syn::DeriveInput = syn::parse(input).unwrap();
let name = &input.ident;
let mut match_arms = vec![];
match &input.data {
syn::Data::Enum(en) => {
for variant in &en.variants {
let snake_case = variant.ident.to_string().to_snake_case();
let ident = &variant.ident;
match_arms.push(quote! {
#snake_case => Some(#name::#ident)
});
}
}
_ => panic!("Can only derive `FromSnakeCase` on enums"),
}
let result = quote! {
impl FromSnakeCase for #name {
fn from_snake_case(val: &str) -> Option<Self> {
match val {
#(#match_arms ,)*
_ => None,
}
}
}
};
result.into()
}
#[proc_macro_derive(ToSnakeCase)]
pub fn derive_to_snake_case(input: TokenStream) -> TokenStream {
let input: syn::DeriveInput = syn::parse(input).unwrap();
let name = &input.ident;
let mut match_arms = vec![];
match &input.data {
syn::Data::Enum(en) => {
for variant in &en.variants {
let snake_case = variant.ident.to_string().to_snake_case();
let ident = &variant.ident;
match_arms.push(quote! {
#name::#ident => #snake_case.to_string()
});
}
}
_ => panic!("Can only derive `ToSnakeCase` on enums"),
}
let result = quote! {
impl ToSnakeCase for #name {
fn to_snake_case(&self) -> String {
match self {
#(#match_arms),*
}
}
}
};
result.into()
}
#[proc_macro]
pub fn entity_metadata(input: TokenStream) -> TokenStream {
entity_metadata::entity_metadata(input)
}