commit 619d1d7ec7b02026f14bbf47460140665684966a Author: Dreaded_X Date: Sun Sep 14 04:01:11 2025 +0200 feat: Initial limited implementation This initial implementation only supports structs with named field and basic enum. 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+[profile.dev.package.similar] +opt-level = 3 diff --git a/lua_typed_macro/Cargo.toml b/lua_typed_macro/Cargo.toml new file mode 100644 index 0000000..7518917 --- /dev/null +++ b/lua_typed_macro/Cargo.toml @@ -0,0 +1,13 @@ +[package] +name = "lua_typed_macro" +version = "0.1.0" +edition = "2024" + +[lib] +proc-macro = true + +[dependencies] +proc-macro2 = "1.0.101" +quote = "1.0.40" +syn = "2.0.106" +convert_case = "0.8.0" diff --git a/lua_typed_macro/src/lib.rs b/lua_typed_macro/src/lib.rs new file mode 100644 index 0000000..e22d671 --- /dev/null +++ b/lua_typed_macro/src/lib.rs @@ -0,0 +1,255 @@ +#![feature(iterator_try_collect)] +use std::ops::Deref; + +use convert_case::{Case, Casing}; +use proc_macro2::TokenStream as TokenStream2; +use quote::{ToTokens, quote}; +use syn::{DeriveInput, LitStr, Token, parse_macro_input, spanned::Spanned}; + +struct StructField { + name: syn::Ident, + ty: syn::Type, + case: Option>, + default: bool, +} + +impl ToTokens for StructField { + fn to_tokens(&self, tokens: &mut TokenStream2) { + let mut name = self.name.to_string(); + + if let Some(case) = self.case { + name = name.to_case(case); + } + + let ty = &self.ty; + + let default = if self.default { "?" } else { "" }; + + let format = format!("---@field {} {{}}{}\n", name, default); + + tokens.extend(quote! { + format!(#format, <#ty as Typed>::type_name()) + }); + } +} + +struct Struct { + name: syn::Ident, + fields: Vec, +} + +impl ToTokens for Struct { + fn to_tokens(&self, tokens: &mut TokenStream2) { + let name = &self.name; + let fields = &self.fields; + + tokens.extend(quote! { + fn generate_header() -> Option { + Some(format!("---@class {}\n", <#name as Typed>::type_name())) + } + + fn generate_members() -> Option { + let mut output = String::new(); + + #( + output += &#fields; + )* + + Some(output) + } + }); + } +} + +struct BasicEnumVariant { + name: syn::Ident, + case: Option>, +} + +impl ToTokens for BasicEnumVariant { + fn to_tokens(&self, tokens: &mut TokenStream2) { + let mut name = self.name.to_string(); + + if let Some(case) = self.case { + name = name.to_case(case); + } + + let format = format!("---| \"{}\"\n", name); + + tokens.extend(quote! { + #format + }); + } +} + +struct BasicEnum { + name: syn::Ident, + variants: Vec, +} + +impl ToTokens for BasicEnum { + fn to_tokens(&self, tokens: &mut TokenStream2) { + let name = &self.name; + let variants = &self.variants; + + tokens.extend(quote! { + fn generate_header() -> Option { + Some(format!("---@alias {}\n", <#name as Typed>::type_name())) + } + + fn generate_members() -> Option { + let mut output = String::new(); + + #( + output += &#variants; + )* + + Some(output) + } + }); + } +} + +#[proc_macro_derive(Typed, attributes(serde))] +pub fn typed(input: proc_macro::TokenStream) -> proc_macro::TokenStream { + let ast = parse_macro_input!(input as DeriveInput); + + let name = &ast.ident; + + let mut case = None; + + for attr in &ast.attrs { + if attr.path().is_ident("serde") + && let Err(err) = attr.parse_nested_meta(|meta| { + if meta.path.is_ident("rename_all") { + let value = meta.value()?; + let case_name: LitStr = value.parse()?; + + case = Some(match case_name.value().deref() { + "lowercase" => Ok(convert_case::Case::Lower), + "UPPERCASE" => Ok(convert_case::Case::Upper), + "PascalCase" => Ok(convert_case::Case::Pascal), + "camelCase" => Ok(convert_case::Case::Camel), + "snake_case" => Ok(convert_case::Case::Snake), + "SCREAMING_SNAKE_CASE" => Ok(convert_case::Case::Constant), + "kebab-case" => Ok(convert_case::Case::Kebab), + "SCREAMING-KEBAB-CASE" => Ok(convert_case::Case::Cobol), + _ => Err(syn::Error::new( + case_name.span(), + "Typed does not support this type of rename", + )), + }?); + } + + Ok(()) + }) + { + return err.into_compile_error().into(); + } + } + + let type_name_fn = quote! { + fn type_name() -> ::std::string::String { + stringify!(#name).to_string() + } + }; + + let test: TokenStream2 = match ast.data { + syn::Data::Struct(data_struct) => { + if data_struct.fields.iter().any(|field| field.ident.is_none()) { + return syn::Error::new( + data_struct.fields.span(), + "Tuple structs are not supported by Typed", + ) + .to_compile_error() + .into(); + } + + let mut fields = Vec::new(); + for field in data_struct.fields { + let mut default = false; + for attr in &field.attrs { + if attr.path().is_ident("serde") + && let Err(err) = attr.parse_nested_meta(|meta| { + if meta.path.is_ident("default") { + default = true; + if meta.input.peek(Token![=]) { + meta.input.parse::()?; + meta.input.parse::()?; + } + } + + Ok(()) + }) + { + return err.into_compile_error().into(); + } + } + + fields.push(StructField { + name: field.ident.expect("We already checked that ident is some"), + ty: field.ty, + case, + default, + }); + } + + Struct { + name: name.to_owned(), + fields, + } + .into_token_stream() + } + syn::Data::Enum(data_enum) => { + let errors: TokenStream2 = data_enum + .variants + .iter() + .filter(|variant| !variant.fields.is_empty()) + .map(|variant| { + syn::Error::new( + variant.fields.span(), + "Only basic enums are supported by Typed", + ) + .into_compile_error() + }) + .collect(); + + if !errors.is_empty() { + return errors.into(); + } + + BasicEnum { + name: name.to_owned(), + variants: data_enum + .variants + .into_iter() + .map(|variant| BasicEnumVariant { + name: variant.ident, + case, + }) + .collect(), + } + .into_token_stream() + } + syn::Data::Union(data_union) => { + return syn::Error::new( + data_union.union_token.span, + "Unions are not supported by Typed", + ) + .into_compile_error() + .into(); + } + }; + + quote! { + impl ::lua_typed::Typed for #name { + #type_name_fn + + #test + } + } + .into() +} + +#[cfg(test)] +mod test {} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..41ead88 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,69 @@ +pub use lua_typed_macro::Typed; +use std::collections::HashMap; + +pub trait Typed { + fn type_name() -> String; + + fn generate_header() -> Option { + None + } + + fn generate_members() -> Option { + None + } + + fn generate_full() -> Option { + let mut output = String::new(); + + let Some(header) = &Self::generate_header() else { + return None; + }; + + output += header; + if let Some(members) = &Self::generate_members() { + output += members; + } + + Some(output) + } +} + +impl Typed for bool { + fn type_name() -> String { + "boolean".into() + } +} + +impl Typed for u8 { + fn type_name() -> String { + "integer".into() + } +} + +impl Typed for String { + fn type_name() -> String { + "string".into() + } +} + +impl Typed for Option { + fn type_name() -> String { + format!("{}?", ::type_name()) + } +} + +impl Typed for Vec { + fn type_name() -> String { + format!("{}[]", ::type_name()) + } +} + +impl Typed for HashMap { + fn type_name() -> String { + format!( + "table<{}, {}>", + ::type_name(), + ::type_name() + ) + } +} diff --git a/tests/notification.rs b/tests/notification.rs new file mode 100644 index 0000000..99f73ff --- /dev/null +++ b/tests/notification.rs @@ -0,0 +1,66 @@ +use lua_typed::Typed; + +#[derive(Typed)] +#[repr(u8)] +#[serde(rename_all = "snake_case")] +pub enum Priority { + Min = 1, + Low, + Default, + High, + Max, +} + +#[test] +fn priority() { + insta::assert_snapshot!(::generate_full().unwrap(), @r#" + ---@alias Priority + ---| "min" + ---| "low" + ---| "default" + ---| "high" + ---| "max" + "#); +} + +#[derive(Typed)] +pub struct Action { + // #[serde(flatten)] + // pub action: ActionType, + pub label: String, + pub clear: Option, +} + +// #[test] +// fn action() { +// insta::assert_snapshot!(::generate_full().unwrap(), @r#" +// ---@class Action +// ---@field action "broadcast" +// ---@field extras table? +// ---@field label string? +// ---@clear clear bool? +// "#); +// } + +#[derive(Typed)] +pub struct Notification { + pub title: String, + pub message: Option, + #[serde(default)] + pub tags: Vec, + pub priority: Option, + #[serde(default)] + pub actions: Vec, +} + +#[test] +fn notification() { + insta::assert_snapshot!(::generate_full().unwrap(), @r" + ---@class Notification + ---@field title string + ---@field message string? + ---@field tags string[]? + ---@field priority Priority? + ---@field actions Action[]? + "); +} diff --git a/tests/ui.rs b/tests/ui.rs new file mode 100644 index 0000000..870c2f9 --- /dev/null +++ b/tests/ui.rs @@ -0,0 +1,5 @@ +#[test] +fn ui() { + let t = trybuild::TestCases::new(); + t.compile_fail("tests/ui/*.rs"); +} diff --git a/tests/ui/complex_struct.rs b/tests/ui/complex_struct.rs new file mode 100644 index 0000000..5ac6fd6 --- /dev/null +++ b/tests/ui/complex_struct.rs @@ -0,0 +1,11 @@ +use lua_typed::Typed; + +#[derive(Typed)] +enum Test { + A, + B(String), + C(u8), + D { test: f32 }, +} + +fn main() {} diff --git a/tests/ui/complex_struct.stderr b/tests/ui/complex_struct.stderr new file mode 100644 index 0000000..d7b8c7a --- /dev/null +++ b/tests/ui/complex_struct.stderr @@ -0,0 +1,17 @@ +error: Only basic enums are supported by Typed + --> tests/ui/complex_struct.rs:6:6 + | +6 | B(String), + | ^^^^^^^^ + +error: Only basic enums are supported by Typed + --> tests/ui/complex_struct.rs:7:6 + | +7 | C(u8), + | ^^^^ + +error: Only basic enums are supported by Typed + --> tests/ui/complex_struct.rs:8:7 + | +8 | D { test: f32 }, + | ^^^^^^^^^^^^^ diff --git a/tests/ui/invalid_rename.rs b/tests/ui/invalid_rename.rs new file mode 100644 index 0000000..bb4c1be --- /dev/null +++ b/tests/ui/invalid_rename.rs @@ -0,0 +1,9 @@ +use lua_typed::Typed; + +#[derive(Typed)] +#[serde(rename_all = "invalid/case")] +enum Test { + HelloWorld, +} + +fn main() {} diff --git a/tests/ui/invalid_rename.stderr b/tests/ui/invalid_rename.stderr new file mode 100644 index 0000000..203c5ec --- /dev/null +++ b/tests/ui/invalid_rename.stderr @@ -0,0 +1,5 @@ +error: Typed does not support this type of rename + --> tests/ui/invalid_rename.rs:4:22 + | +4 | #[serde(rename_all = "invalid/case")] + | ^^^^^^^^^^^^^^ diff --git a/tests/ui/tuple_struct.rs b/tests/ui/tuple_struct.rs new file mode 100644 index 0000000..194da52 --- /dev/null +++ b/tests/ui/tuple_struct.rs @@ -0,0 +1,6 @@ +use lua_typed::Typed; + +#[derive(Typed)] +pub struct Test(u8); + +fn main() {} diff --git a/tests/ui/tuple_struct.stderr b/tests/ui/tuple_struct.stderr new file mode 100644 index 0000000..6e2f336 --- /dev/null +++ b/tests/ui/tuple_struct.stderr @@ -0,0 +1,5 @@ +error: Tuple structs are not supported by Typed + --> tests/ui/tuple_struct.rs:4:16 + | +4 | pub struct Test(u8); + | ^^^^ diff --git a/tests/ui/union.rs b/tests/ui/union.rs new file mode 100644 index 0000000..e9690ec --- /dev/null +++ b/tests/ui/union.rs @@ -0,0 +1,9 @@ +use lua_typed::Typed; + +#[derive(Typed)] +union MyUnion { + f1: u32, + f2: f32, +} + +fn main() {} diff --git a/tests/ui/union.stderr b/tests/ui/union.stderr new file mode 100644 index 0000000..55654a8 --- /dev/null +++ b/tests/ui/union.stderr @@ -0,0 +1,5 @@ +error: Unions are not supported by Typed + --> tests/ui/union.rs:4:1 + | +4 | union MyUnion { + | ^^^^^