add support for unnamed structs to azalea-buf-macros

azalea-buf/azalea-buf-macros/src/read.rs

@@ -1,62 +1,6 @@
 use quote::{ToTokens, quote};
 use syn::{Data, Field, FieldsNamed, Ident, punctuated::Punctuated, token::Comma};
 
-fn read_named_fields(
-    named: &Punctuated<Field, Comma>,
-) -> (Vec<proc_macro2::TokenStream>, Vec<&Option<Ident>>) {
-    let read_fields = named
-        .iter()
-        .map(|f| {
-            let field_name = &f.ident;
-            let field_type = &f.ty;
-
-            let is_variable_length = f.attrs.iter().any(|a| a.path().is_ident("var"));
-            let limit = f
-                .attrs
-                .iter()
-                .find(|a| a.path().is_ident("limit"))
-                .map(|a| {
-                    a.parse_args::<syn::LitInt>()
-                        .unwrap()
-                        .base10_parse::<usize>()
-                        .unwrap()
-                });
-
-            if is_variable_length && limit.is_some() {
-                panic!("Fields cannot have both var and limit attributes");
-            }
-
-            // do a different buf.write_* for each field depending on the type
-            // if it's a string, use buf.write_string
-            match field_type {
-                syn::Type::Path(_) | syn::Type::Array(_) => {
-                    if is_variable_length {
-                        quote! {
-                            let #field_name = azalea_buf::AzaleaReadVar::azalea_read_var(buf)?;
-                        }
-                    } else if let Some(limit) = limit {
-                        quote! {
-                            let #field_name = azalea_buf::AzaleaReadLimited::azalea_read_limited(buf, #limit)?;
-                        }
-                    } else {
-                        quote! {
-                            let #field_name = azalea_buf::AzaleaRead::azalea_read(buf)?;
-                        }
-                    }
-                }
-                _ => panic!(
-                    "Error reading field {}: {}",
-                    field_name.clone().unwrap(),
-                    field_type.to_token_stream()
-                ),
-            }
-        })
-        .collect::<Vec<_>>();
-    let read_field_names = named.iter().map(|f| &f.ident).collect::<Vec<_>>();
-
-    (read_fields, read_field_names)
-}
-
 pub fn create_impl_azalearead(ident: &Ident, data: &Data) -> proc_macro2::TokenStream {
     match data {
         syn::Data::Struct(syn::DataStruct { fields, .. }) => match fields {
@@ -83,8 +27,18 @@ pub fn create_impl_azalearead(ident: &Ident, data: &Data) -> proc_macro2::TokenS
                 }
                 }
             }
-            _ => {
-                panic!("#[derive(AzBuf)] can only be used on structs with named fields")
+            syn::Fields::Unnamed(fields) => {
+                let read_fields = read_unnamed_fields(&fields.unnamed);
+
+                quote! {
+                impl azalea_buf::AzaleaRead for #ident {
+                    fn azalea_read(buf: &mut std::io::Cursor<&[u8]>) -> Result<Self, azalea_buf::BufReadError> {
+                        Ok(Self(
+                            #(#read_fields),*
+                        ))
+                    }
+                }
+                }
             }
         },
         syn::Data::Enum(syn::DataEnum { variants, .. }) => {
@@ -202,3 +156,82 @@ pub fn create_impl_azalearead(ident: &Ident, data: &Data) -> proc_macro2::TokenS
         _ => panic!("#[derive(AzBuf)] can only be used on structs"),
     }
 }
+
+fn read_named_fields(
+    named: &Punctuated<Field, Comma>,
+) -> (Vec<proc_macro2::TokenStream>, Vec<&Option<Ident>>) {
+    let read_fields = named
+        .iter()
+        .map(|f| {
+            let field_name = &f.ident;
+
+            let reader_call = get_reader_call(f);
+            quote! { let #field_name = #reader_call; }
+        })
+        .collect::<Vec<_>>();
+    let read_field_names = named.iter().map(|f| &f.ident).collect::<Vec<_>>();
+
+    (read_fields, read_field_names)
+}
+
+fn read_unnamed_fields(unnamed: &Punctuated<Field, Comma>) -> Vec<proc_macro2::TokenStream> {
+    let read_fields = unnamed
+        .iter()
+        .map(|f| {
+            let reader_call = get_reader_call(f);
+            quote! { #reader_call }
+        })
+        .collect::<Vec<_>>();
+
+    read_fields
+}
+
+fn get_reader_call(f: &Field) -> proc_macro2::TokenStream {
+    let is_variable_length = f
+        .attrs
+        .iter()
+        .any(|a: &syn::Attribute| a.path().is_ident("var"));
+    let limit = f
+        .attrs
+        .iter()
+        .find(|a| a.path().is_ident("limit"))
+        .map(|a| {
+            a.parse_args::<syn::LitInt>()
+                .unwrap()
+                .base10_parse::<usize>()
+                .unwrap()
+        });
+
+    if is_variable_length && limit.is_some() {
+        panic!("Fields cannot have both var and limit attributes");
+    }
+
+    let field_type = &f.ty;
+
+    // do a different buf.write_* for each field depending on the type
+    // if it's a string, use buf.write_string
+    let reader_call = match field_type {
+        syn::Type::Path(_) | syn::Type::Array(_) => {
+            if is_variable_length {
+                quote! {
+                    azalea_buf::AzaleaReadVar::azalea_read_var(buf)?
+                }
+            } else if let Some(limit) = limit {
+                quote! {
+                    azalea_buf::AzaleaReadLimited::azalea_read_limited(buf, #limit)?
+                }
+            } else {
+                quote! {
+                    azalea_buf::AzaleaRead::azalea_read(buf)?
+                }
+            }
+        }
+        _ => panic!(
+            "Error reading field {:?}: {}",
+            f.ident.clone(),
+            field_type.to_token_stream()
+        ),
+    };
+
+    reader_call
+}

azalea-buf/azalea-buf-macros/src/write.rs

@@ -2,41 +2,6 @@ use proc_macro2::Span;
 use quote::{ToTokens, quote};
 use syn::{Data, Field, FieldsNamed, Ident, punctuated::Punctuated, token::Comma};
 
-fn write_named_fields(
-    named: &Punctuated<Field, Comma>,
-    ident_name: Option<&Ident>,
-) -> proc_macro2::TokenStream {
-    let write_fields = named.iter().map(|f| {
-        let field_name = &f.ident;
-        let field_type = &f.ty;
-        let ident_dot_field = match ident_name {
-            Some(ident) => quote! { &#ident.#field_name },
-            None => quote! { #field_name },
-        };
-        // do a different buf.write_* for each field depending on the type
-        // if it's a string, use buf.write_string
-        match field_type {
-            syn::Type::Path(_) | syn::Type::Array(_) => {
-                if f.attrs.iter().any(|attr| attr.path().is_ident("var")) {
-                    quote! {
-                        azalea_buf::AzaleaWriteVar::azalea_write_var(#ident_dot_field, buf)?;
-                    }
-                } else {
-                    quote! {
-                        azalea_buf::AzaleaWrite::azalea_write(#ident_dot_field, buf)?;
-                    }
-                }
-            }
-            _ => panic!(
-                "Error writing field {}: {}",
-                field_name.clone().unwrap(),
-                field_type.to_token_stream()
-            ),
-        }
-    });
-    quote! { #(#write_fields)* }
-}
-
 pub fn create_impl_azaleawrite(ident: &Ident, data: &Data) -> proc_macro2::TokenStream {
     match data {
         syn::Data::Struct(syn::DataStruct { fields, .. }) => match fields {
@@ -62,8 +27,17 @@ pub fn create_impl_azaleawrite(ident: &Ident, data: &Data) -> proc_macro2::Token
                     }
                 }
             }
-            _ => {
-                panic!("#[derive(AzBuf)] can only be used on structs with named fields")
+            syn::Fields::Unnamed(fields) => {
+                let write_fields = write_unnamed_fields(&fields.unnamed);
+
+                quote! {
+                    impl azalea_buf::AzaleaWrite for #ident {
+                        fn azalea_write(&self, buf: &mut impl std::io::Write) -> Result<(), std::io::Error> {
+                            #write_fields
+                            Ok(())
+                        }
+                    }
+                }
             }
         },
         syn::Data::Enum(syn::DataEnum { variants, .. }) => {
@@ -200,3 +174,56 @@ pub fn create_impl_azaleawrite(ident: &Ident, data: &Data) -> proc_macro2::Token
         _ => panic!("#[derive(AzBuf)] can only be used on structs"),
     }
 }
+
+fn write_named_fields(
+    named: &Punctuated<Field, Comma>,
+    ident_name: Option<&Ident>,
+) -> proc_macro2::TokenStream {
+    let write_fields = named.iter().map(|f| {
+        let field_name = &f.ident;
+        let ident_dot_field = match ident_name {
+            Some(ident) => quote! { &#ident.#field_name },
+            None => quote! { #field_name },
+        };
+
+        make_write_call(f, ident_dot_field)
+    });
+    quote! { #(#write_fields)* }
+}
+
+fn write_unnamed_fields(named: &Punctuated<Field, Comma>) -> proc_macro2::TokenStream {
+    let write_fields = named.iter().enumerate().map(|(i, f)| {
+        let i_literal = syn::Index::from(i);
+        let ident_dot_field = quote! { &self.#i_literal };
+
+        make_write_call(f, ident_dot_field)
+    });
+    quote! { #(#write_fields)* }
+}
+
+fn make_write_call(
+    f: &Field,
+    ident_dot_field: proc_macro2::TokenStream,
+) -> proc_macro2::TokenStream {
+    let field_type = &f.ty;
+    // do a different buf.write_* for each field depending on the type
+    // if it's a string, use buf.write_string
+    match field_type {
+        syn::Type::Path(_) | syn::Type::Array(_) => {
+            if f.attrs.iter().any(|attr| attr.path().is_ident("var")) {
+                quote! {
+                    azalea_buf::AzaleaWriteVar::azalea_write_var(#ident_dot_field, buf)?;
+                }
+            } else {
+                quote! {
+                    azalea_buf::AzaleaWrite::azalea_write(#ident_dot_field, buf)?;
+                }
+            }
+        }
+        _ => panic!(
+            "Error writing field {:?}: {}",
+            f.ident,
+            field_type.to_token_stream()
+        ),
+    }
+}

azalea-protocol/src/packets/game/s_container_click.rs

@@ -1,7 +1,7 @@
 use std::collections::HashMap;
 
 use azalea_buf::AzBuf;
-use azalea_inventory::{operations::ClickType, ItemStack};
+use azalea_inventory::{ItemStack, operations::ClickType};
 use azalea_protocol_macros::ServerboundGamePacket;
 
 #[derive(Clone, Debug, AzBuf, ServerboundGamePacket)]