120 lines
3.4 KiB
Rust
120 lines
3.4 KiB
Rust
use proc_macro::TokenStream;
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use proc_macro2::{Ident, Span};
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use quote::quote;
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use syn::{parse_macro_input, AttributeArgs, Error, ItemFn};
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#[cfg(feature = "macros")]
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use {
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crate::chunk::Chunk, proc_macro::TokenTree, proc_macro2::TokenStream as TokenStream2,
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proc_macro_error::proc_macro_error,
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};
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#[proc_macro_attribute]
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pub fn lua_module(attr: TokenStream, item: TokenStream) -> TokenStream {
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let args = parse_macro_input!(attr as AttributeArgs);
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let func = parse_macro_input!(item as ItemFn);
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if !args.is_empty() {
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let err = Error::new(Span::call_site(), "the macro does not support arguments")
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.to_compile_error();
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return err.into();
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}
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let func_name = func.sig.ident.clone();
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let ext_entrypoint_name = Ident::new(&format!("luaopen_{}", func_name), Span::call_site());
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let wrapped = quote! {
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::mlua::require_module_feature!();
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#func
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#[no_mangle]
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unsafe extern "C" fn #ext_entrypoint_name(state: *mut ::mlua::lua_State) -> ::std::os::raw::c_int {
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::mlua::Lua::init_from_ptr(state)
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.entrypoint1(#func_name)
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.expect("cannot initialize module")
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}
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};
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wrapped.into()
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}
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#[cfg(feature = "macros")]
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fn to_ident(tt: &TokenTree) -> TokenStream2 {
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let s: TokenStream = tt.clone().into();
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s.into()
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}
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#[cfg(feature = "macros")]
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#[proc_macro]
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#[proc_macro_error]
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pub fn chunk(input: TokenStream) -> TokenStream {
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let chunk = Chunk::new(input);
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let source = chunk.source();
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let caps_len = chunk.captures().len();
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let caps = chunk.captures().iter().map(|cap| {
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let cap_name = cap.as_rust().to_string();
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let cap = to_ident(cap.as_rust());
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quote! { env.raw_set(#cap_name, #cap)?; }
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});
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let wrapped_code = quote! {{
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use ::mlua::{AsChunk, ChunkMode, Lua, Result, Value};
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use ::std::marker::PhantomData;
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use ::std::sync::Mutex;
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fn annotate<'a, F: FnOnce(&'a Lua) -> Result<Value<'a>>>(f: F) -> F { f }
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struct InnerChunk<'a, F: FnOnce(&'a Lua) -> Result<Value<'a>>>(Mutex<Option<F>>, PhantomData<&'a ()>);
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impl<'lua, F> AsChunk<'lua> for InnerChunk<'lua, F>
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where
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F: FnOnce(&'lua Lua) -> Result<Value<'lua>>,
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{
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fn source(&self) -> &[u8] {
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(#source).as_bytes()
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}
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fn env(&self, lua: &'lua Lua) -> Result<Option<Value<'lua>>> {
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if #caps_len > 0 {
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if let Ok(mut make_env) = self.0.lock() {
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if let Some(make_env) = make_env.take() {
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return make_env(lua).map(Some);
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}
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}
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}
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Ok(None)
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}
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fn mode(&self) -> Option<ChunkMode> {
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Some(ChunkMode::Text)
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}
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}
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let make_env = annotate(move |lua: &Lua| -> Result<Value> {
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let globals = lua.globals();
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let env = lua.create_table()?;
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let meta = lua.create_table()?;
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meta.raw_set("__index", globals.clone())?;
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meta.raw_set("__newindex", globals)?;
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// Add captured variables
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#(#caps)*
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env.set_metatable(Some(meta));
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Ok(Value::Table(env))
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});
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&InnerChunk(Mutex::new(Some(make_env)), PhantomData)
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}};
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wrapped_code.into()
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}
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#[cfg(feature = "macros")]
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mod chunk;
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#[cfg(feature = "macros")]
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mod token;
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