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Fix(lua_macros): Rework to support new command focused layout 

The internal commands are wrapped by a lua api, which allows to write
the whole thing a little bit more language agnostic.
This commit is contained in:
Benedikt Peetz 2023-07-20 21:43:41 +02:00
parent 27e3ff228c
commit c243c90cab
Signed by: bpeetz
GPG Key ID: A5E94010C3A642AD
6 changed files with 261 additions and 141 deletions
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84
lua_macros/src/lib.rs
View File

@ -3,61 +3,67 @@ mod struct_to_ci_enum;
use mark_as_ci_command::generate_final_function;
use proc_macro::TokenStream;
use proc_macro2::TokenStream as TokenStream2;
use quote::quote;
use struct_to_ci_enum::{generate_command_enum, generate_generate_ci_function};
use syn::{self, ItemFn, Field, parse::Parser};
use proc_macro2::{Span, TokenStream as TokenStream2};
use quote::{format_ident, quote};
use struct_to_ci_enum::{generate_command_enum, generate_generate_ci_function, generate_help_function};
use syn::{self, parse_quote, parse_str, DeriveInput, FieldMutability, ItemFn, Token, Visibility};
#[proc_macro_attribute]
pub fn turn_struct_to_ci_commands(_attrs: TokenStream, input: TokenStream) -> TokenStream {
pub fn turn_struct_to_ci_command_enum(_attrs: TokenStream, input: TokenStream) -> TokenStream {
// Construct a representation of Rust code as a syntax tree
// that we can manipulate
let input = syn::parse(input)
.expect("This should always be valid rust code, as it's extracted from direct code");
let mut input: DeriveInput = syn::parse(input).expect("This should always be valid rust code, as it's extracted from direct code");
let mut named_fields = match &input.data {
syn::Data::Struct(input) => match &input.fields {
syn::Fields::Named(named_fields) => named_fields,
_ => unimplemented!("The macro only works for named fields (e.g.: `Name: Type`)"),
},
_ => unimplemented!("The macro only works for structs"),
}
.to_owned();
let attr_parsed = parse_quote! {
/// This is a help function
};
named_fields.named.push(syn::Field {
attrs: vec![attr_parsed],
// attrs: attr_parser
// .parse("#[doc = r\"This is a help function\"]".to_token_stream().into())
// .expect("See reason for other one"),
vis: Visibility::Inherited,
mutability: FieldMutability::None,
ident: Some(format_ident!("help")),
colon_token: Some(Token![:](Span::call_site())),
ty: parse_str("fn(Option<String>) -> String").expect("This is static and valid rust code"),
});
match &mut input.data {
syn::Data::Struct(input) => input.fields = syn::Fields::Named(named_fields.clone()),
_ => unreachable!("This was a DataStruct before"),
};
// Build the trait implementation
let generate_ci_function: TokenStream2 = generate_generate_ci_function(&input);
let command_enum = generate_command_enum(&input);
let command_enum = generate_command_enum(&named_fields);
let help_function = generate_help_function(&named_fields);
quote! {
#command_enum
#generate_ci_function
//#help_function
}
.into()
}
/// Generate a default lua function implementation.
// TODO: Is this needed?
#[proc_macro_attribute]
pub fn gen_lua_function(_attrs: TokenStream, input: TokenStream) -> TokenStream {
// Construct a representation of Rust code as a syntax tree
// that we can manipulate
let parser = Field::parse_named;
let input = parser.parse(input)
.expect("This is only defined for named fileds.");
quote! {
#input
}
.into()
}
/// Turn a function into a valid ci command function
#[proc_macro_attribute]
pub fn ci_command(_attrs: TokenStream, input: TokenStream) -> TokenStream {
// Construct a representation of Rust code as a syntax tree
// that we can manipulate
let mut input: ItemFn = syn::parse(input)
.expect("This should always be valid rust code, as it's extracted from direct code");
// Build the trait implementation
let output_function: TokenStream2 = generate_final_function(&mut input);
//panic!("{:#?}", output_function);
quote! {
#output_function
}
.into()
let mut input: ItemFn = syn::parse(input).expect("This should always be valid rust code, as it's extracted from direct code");
let output_function = generate_final_function(&mut input);
output_function.into()
}

56
lua_macros/src/mark_as_ci_command.rs
View File

@ -58,18 +58,13 @@ fn append_tx_send_code(input: &mut syn::ItemFn) -> &mut syn::ItemFn {
// There should only be two segments (the type is <String, rlua::Error>)
if filtered_paths.len() > 2 {
unreachable!(
"There should be no more than two filtered_output, but got: {:#?}",
filtered_paths
)
unreachable!("There should be no more than two filtered_output, but got: {:#?}", filtered_paths)
} else if filtered_paths.len() <= 0 {
unreachable!(
"There should be more than zero filtered_output, but got: {:#?}",
filtered_paths
)
unreachable!("There should be more than zero filtered_output, but got: {:#?}", filtered_paths)
}
if filtered_paths.len() == 2 {
// There is something else than rlua
// There is something else than mlua::Error
let gen_type = if let GenericArgument::Type(ret_type) =
filtered_paths
.first()
@ -97,36 +92,64 @@ fn append_tx_send_code(input: &mut syn::ItemFn) -> &mut syn::ItemFn {
}
_ => unimplemented!("Only for path types"),
};
let send_data = match return_type {
ReturnType::Default => {
quote! {
{
Event::CommandEvent(Command::#function_name_pascal)
Event::CommandEvent(Command::#function_name_pascal, None)
}
}
}
ReturnType::Type(_, _) => {
quote! {
{
Event::CommandEvent(Command::#function_name_pascal(input_str.clone()))
Event::CommandEvent(Command::#function_name_pascal(input.clone()), Some(callback_tx))
}
}
}
};
let output_return = match return_type {
ReturnType::Default => {
quote! {
{
return Ok(());
}
}
}
ReturnType::Type(_, _) => {
quote! {
{
if let Some(output) = callback_rx.recv().await {
callback_rx.close();
return Ok(output);
} else {
return Err(mlua::Error::ExternalError(Arc::new(Error::new(
ErrorKind::Other,
"Callback reciever dropped",
))));
}
}
}
}
};
quote! {
{
let (callback_tx, mut callback_rx) = tokio::sync::mpsc::channel::<String>(256);
let tx:
core::cell::Ref<
tokio::sync::mpsc::Sender<crate::app::events::event_types::Event>
> =
core::cell::Ref<tokio::sync::mpsc::Sender<crate::app::events::event_types::Event>> =
lua
.app_data_ref()
.expect("This exists, it was set before");
(*tx)
.send(#send_data)
.await
.try_send(#send_data)
.expect("This should work, as the reciever is not dropped");
#output_return
}
}
}
@ -134,6 +157,7 @@ fn append_tx_send_code(input: &mut syn::ItemFn) -> &mut syn::ItemFn {
let tx_send_block: Block =
syn::parse(tx_send.into()).expect("This is a static string, it will always parse");
let tx_send_expr_block = ExprBlock {
attrs: vec![],
label: None,

65
lua_macros/src/struct_to_ci_enum/generate_command_enum.rs Normal file
View File

@ -0,0 +1,65 @@
use convert_case::{Case, Casing};
use proc_macro2::TokenStream as TokenStream2;
use quote::{format_ident, quote};
use syn::Type;
pub fn generate_command_enum(input: &syn::FieldsNamed) -> TokenStream2 {
let input_tokens: TokenStream2 = input
.named
.iter()
.map(|field| -> TokenStream2 {
let field_ident = field
.ident
.as_ref()
.expect("These are only the named fields, thus they should all have a ident.");
let enum_variant_type = match &field.ty {
syn::Type::BareFn(function) => {
let return_path = &function.inputs;
let input_type: Option<Type> = if return_path.len() == 1 {
Some(
return_path
.last()
.expect("The last element exists")
.ty
.clone(),
)
} else if return_path.len() == 0 {
None
} else {
panic!("The Function can only take on argument, or none");
};
input_type
}
_ => unimplemented!("This is only implemented for bare function types"),
};
let enum_variant_name = format_ident!(
"{}",
field_ident
.to_string()
.from_case(Case::Snake)
.to_case(Case::Pascal)
);
if enum_variant_type.is_some() {
quote! {
#enum_variant_name (#enum_variant_type),
}
.into()
} else {
quote! {
#enum_variant_name,
}
}
})
.collect();
let gen = quote! {
#[derive(Debug)]
pub enum Command {
#input_tokens
}
};
gen.into()
}

137
lua_macros/src/struct_to_ci_enum.rs → lua_macros/src/struct_to_ci_enum/generate_generate_ci_function.rs
View File

@ -1,63 +1,13 @@
use convert_case::{Case, Casing};
use proc_macro2::TokenStream as TokenStream2;
use quote::{format_ident, quote};
use syn::{self, ReturnType};
use syn::{parse_quote, ReturnType, Type};
pub fn generate_generate_ci_function(input: &syn::DeriveInput) -> TokenStream2 {
let mut functions_to_generate: Vec<TokenStream2> = vec![];
let input_tokens: TokenStream2 = match &input.data {
syn::Data::Struct(input) => match &input.fields {
syn::Fields::Named(named_fields) => named_fields
.named
.iter()
.map(|field| -> TokenStream2 {
if field.attrs.iter().any(|attribute| {
attribute.path()
== &syn::parse_str::<syn::Path>("gen_default_lua_function")
.expect("This is valid rust code")
}) {
let function_name = field
.ident
.as_ref()
.expect("These are only the named field, thus they all should have a name.");
functions_to_generate.push(quote! {
#[ci_command]
async fn #function_name(lua: &mlua::Lua, input_str: String) -> Result<(), mlua::Error> {
Ok(())
}
});
generate_ci_part(field)
} else {
generate_ci_part(field)
}
})
.collect(),
_ => unimplemented!("Only implemented for named fileds"),
},
_ => unimplemented!("Only implemented for structs"),
};
let functions_to_generate: TokenStream2 = functions_to_generate.into_iter().collect();
let gen = quote! {
pub fn generate_ci_functions(
lua: &mut mlua::Lua,
tx: tokio::sync::mpsc::Sender<crate::app::events::event_types::Event>)
{
lua.set_app_data(tx);
let globals = lua.globals();
#input_tokens
}
#functions_to_generate
};
gen.into()
}
fn generate_ci_part(field: &syn::Field) -> TokenStream2 {
fn generate_ci_function_exposure(field: &syn::Field) -> TokenStream2 {
let field_ident = field
.ident
.as_ref()
.expect("These are only the named field, thus they all should have a name.");
let function_name_ident = format_ident!("fun_{}", field_ident);
let function_name = format!("{}", field_ident);
quote! {
@ -79,62 +29,77 @@ fn generate_ci_part(field: &syn::Field) -> TokenStream2 {
.into()
}
pub fn generate_command_enum(input: &syn::DeriveInput) -> TokenStream2 {
let input_tokens: TokenStream2 = match &input.data {
pub fn generate_generate_ci_function(input: &syn::DeriveInput) -> TokenStream2 {
let mut functions_to_generate: Vec<TokenStream2> = vec![];
let functions_to_export_in_lua: TokenStream2 = match &input.data {
syn::Data::Struct(input) => match &input.fields {
syn::Fields::Named(named_fields) => named_fields
.named
.iter()
.map(|field| -> TokenStream2 {
let field_ident = field
.ident
.as_ref()
.expect("These are only the named field, thus they all should have a name.");
let enum_variant_type = match &field.ty {
syn::Type::BareFn(function) => {
let return_path: &ReturnType = &function.output;
match return_path {
ReturnType::Default => None,
ReturnType::Type(_, return_type) => Some(match *(return_type.to_owned()) {
syn::Type::Path(path_type) => path_type
.path
.get_ident()
.expect("A path should either be complete, or only conain one segment")
.to_owned(),
_ => unimplemented!("This is only implemented for path types"),
}),
let input_type = match &field.ty {
syn::Type::BareFn(bare_fn) => {
if bare_fn.inputs.len() == 1 {
bare_fn.inputs.last().expect("The last element exists").ty.clone()
} else if bare_fn.inputs.len() == 0 {
let input_type: Type = parse_quote! {()};
input_type
} else {
panic!("The Function can only take on argument, or none");
}
}
_ => unimplemented!("This is only implemented for bare function types"),
};
let return_type = match &field.ty {
syn::Type::BareFn(function) => {
let return_path: &ReturnType = &function.output;
match return_path {
ReturnType::Default => None,
ReturnType::Type(_, return_type) => Some(return_type.to_owned()) }
}
_ => unimplemented!("This is only implemented for bare function types"),
};
let enum_variant_name = format_ident!(
"{}",
field_ident.to_string().from_case(Case::Snake).to_case(Case::Pascal)
);
if enum_variant_type.is_some() {
quote! {
#enum_variant_name (#enum_variant_type),
let function_name = field
.ident
.as_ref()
.expect("These are only the named field, thus they all should have a name.");
if let Some(ret_type) = return_type {
functions_to_generate.push(quote! {
#[ci_command]
async fn #function_name(lua: &mlua::Lua, input: #input_type) -> Result<#ret_type, mlua::Error> {
}
.into()
});
} else {
quote! {
#enum_variant_name,
functions_to_generate.push(quote! {
#[ci_command]
async fn #function_name(lua: &mlua::Lua, input: #input_type) -> Result<(), mlua::Error> {
}
});
}
generate_ci_function_exposure(field)
})
.collect(),
_ => unimplemented!("Only implemented for named fileds"),
},
_ => unimplemented!("Only implemented for structs"),
};
let functions_to_generate: TokenStream2 = functions_to_generate.into_iter().collect();
let gen = quote! {
#[derive(Debug)]
pub enum Command {
#input_tokens
pub fn generate_ci_functions(
lua: &mut mlua::Lua,
tx: tokio::sync::mpsc::Sender<crate::app::events::event_types::Event>
)
{
lua.set_app_data(tx);
let globals = lua.globals();
#functions_to_export_in_lua
}
#functions_to_generate
};
gen.into()
}

53
lua_macros/src/struct_to_ci_enum/generate_help_function.rs Normal file
View File

@ -0,0 +1,53 @@
use proc_macro2::TokenStream as TokenStream2;
use quote::{quote, ToTokens};
pub fn generate_help_function(input: &syn::FieldsNamed) -> TokenStream2 {
let input: Vec<_> = input.named.iter().collect();
let combined_help_text: TokenStream2 = input
.iter()
.map(|field| {
let attrs_with_doc: Vec<TokenStream2> = field
.attrs
.iter()
.filter_map(|attr| {
if attr.path().is_ident("doc") {
let help_text = attr
.meta
.require_name_value()
.expect("This is a named value type, because all doc comments work this way")
.value
.clone();
Some(help_text.into_token_stream().into())
} else {
return None;
}
})
.collect();
if attrs_with_doc.len() == 0 {
// TODO there should be a better panic function, than the generic one
panic!(
"The command named: `{}`, does not provide a help message",
field.ident.as_ref().expect("These are all named")
);
} else {
let help_text_for_one_command_combined: TokenStream2 = attrs_with_doc.into_iter().collect();
return help_text_for_one_command_combined;
}
})
.collect();
quote! {
#[ci_command]
async fn help(
lua: &mlua::Lua,
input_str: Option<String>
) -> Result<String, mlua::Error> {
// TODO add a way to filter the help based on the input
let output = "These functions exist:\n";
output.push_str(#combined_help_text);
Ok(output)
}
}
}

7
lua_macros/src/struct_to_ci_enum/mod.rs Normal file
View File

@ -0,0 +1,7 @@
pub mod generate_command_enum;
pub mod generate_generate_ci_function;
pub mod generate_help_function;
pub use generate_command_enum::*;
pub use generate_generate_ci_function::*;
pub use generate_help_function::*;