WIP: procmacro for automatic packet generation

Cargo.toml

@@ -1,21 +1,6 @@
-[package]
-name = "minecraft-protocol"
-version = "0.1.0"
-authors = ["vagola <vladislavs.golubs@yandex.ru>"]
-edition = "2018"
-description = "Library for decoding and encoding Minecraft packets"
-license = "MIT"
-homepage = "https://github.com/eihwaz/minecraft-protocol"
-repository = "https://github.com/eihwaz/minecraft-protocol"
-keywords = ["minecraft", "protocol", "packet", "io"]
-readme = "README.md"
+[workspace]
 
-[dependencies]
-byteorder = "1"
-serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
-uuid = { version = "0.7", features = ["v4", "serde"] }
-mc-varint = { git = "https://github.com/luojia65/mc-varint" }
-num-traits = "0.2"
-num-derive = "0.2"
-named-binary-tag = "0.2"
+members = [
+    "protocol",
+    "protocol-derive",
+]

protocol-derive/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "minecraft-protocol-derive"
+version = "0.0.0"
+authors = ["vagola <vladislavs.golubs@yandex.ru>"]
+edition = "2018"
+description = "Derive macro for Minecraft packet read and write"
+publish = false
+
+[lib]
+proc-macro = true
+
+[dependencies]
+syn = "1.0"
+quote = "1.0"

protocol-derive/src/lib.rs

@@ -0,0 +1,28 @@
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+use quote::quote;
+use syn::{parse_macro_input, DeriveInput};
+
+#[proc_macro_derive(MinecraftPacket)]
+pub fn derive_packet(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as DeriveInput);
+
+    let name = input.ident;
+
+    let output = quote! {
+        impl minecraft_protocol::Packet for #name {
+            type Output = Self;
+
+            fn encode<W: Write>(&self, writer: &mut W) -> Result<(), EncodeError> {
+
+            }
+
+            fn decode<R: Read>(reader: &mut R) -> Result<Self::Output, DecodeError> {
+
+            }
+        }
+    };
+
+    TokenStream::from(output)
+}

protocol/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "minecraft-protocol"
+version = "0.1.0"
+authors = ["vagola <vladislavs.golubs@yandex.ru>"]
+edition = "2018"
+description = "Library for decoding and encoding Minecraft packets"
+license = "MIT"
+homepage = "https://github.com/eihwaz/minecraft-protocol"
+repository = "https://github.com/eihwaz/minecraft-protocol"
+keywords = ["minecraft", "protocol", "packet", "io"]
+readme = "README.md"
+
+[dependencies]
+minecraft-protocol-derive = { path = "../protocol-derive" }
+byteorder = "1"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+uuid = { version = "0.7", features = ["v4", "serde"] }
+mc-varint = { git = "https://github.com/luojia65/mc-varint" }
+num-traits = "0.2"
+num-derive = "0.2"
+named-binary-tag = "0.2"

protocol/src/login.rs

@@ -106,6 +106,7 @@ impl LoginClientBoundPacket {
     }
 }
 
+#[derive(minecraft_protocol_derive::MinecraftPacket)]
 pub struct LoginStart {
     pub name: String,
 }
@@ -118,20 +119,6 @@ impl LoginStart {
     }
 }
 
-impl Packet for LoginStart {
-    type Output = Self;
-
-    fn encode<W: Write>(&self, writer: &mut W) -> Result<(), EncodeError> {
-        writer.write_string(&self.name, LOGIN_MAX_LENGTH)
-    }
-
-    fn decode<R: Read>(reader: &mut R) -> Result<Self::Output, DecodeError> {
-        let name = reader.read_string(LOGIN_MAX_LENGTH)?;
-
-        Ok(LoginStart { name })
-    }
-}
-
 pub struct EncryptionResponse {
     pub shared_secret: Vec<u8>,
     pub verify_token: Vec<u8>,