mirror of
https://github.com/zed-industries/zed.git
synced 2024-09-19 10:29:35 +03:00
278 lines
12 KiB
Rust
278 lines
12 KiB
Rust
use proc_macro::TokenStream;
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use proc_macro2::Ident;
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use quote::{format_ident, quote};
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use std::mem;
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use syn::{
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parse_macro_input, parse_quote, spanned::Spanned as _, AttributeArgs, FnArg, ItemFn, Lit, Meta,
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NestedMeta, Type,
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};
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#[proc_macro_attribute]
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pub fn test(args: TokenStream, function: TokenStream) -> TokenStream {
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let mut namespace = format_ident!("gpui");
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let args = syn::parse_macro_input!(args as AttributeArgs);
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let mut max_retries = 0;
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let mut num_iterations = 1;
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let mut starting_seed = 0;
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let mut detect_nondeterminism = false;
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let mut on_failure_fn_name = quote!(None);
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for arg in args {
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match arg {
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NestedMeta::Meta(Meta::Path(name))
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if name.get_ident().map_or(false, |n| n == "self") =>
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{
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namespace = format_ident!("crate");
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}
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NestedMeta::Meta(Meta::NameValue(meta)) => {
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let key_name = meta.path.get_ident().map(|i| i.to_string());
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let result = (|| {
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match key_name.as_deref() {
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Some("detect_nondeterminism") => {
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detect_nondeterminism = parse_bool(&meta.lit)?
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}
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Some("retries") => max_retries = parse_int(&meta.lit)?,
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Some("iterations") => num_iterations = parse_int(&meta.lit)?,
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Some("seed") => starting_seed = parse_int(&meta.lit)?,
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Some("on_failure") => {
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if let Lit::Str(name) = meta.lit {
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let ident = Ident::new(&name.value(), name.span());
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on_failure_fn_name = quote!(Some(#ident));
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} else {
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return Err(TokenStream::from(
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syn::Error::new(
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meta.lit.span(),
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"on_failure argument must be a string",
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)
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.into_compile_error(),
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));
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}
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}
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_ => {
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return Err(TokenStream::from(
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syn::Error::new(meta.path.span(), "invalid argument")
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.into_compile_error(),
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))
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}
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}
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Ok(())
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})();
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if let Err(tokens) = result {
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return tokens;
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}
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}
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other => {
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return TokenStream::from(
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syn::Error::new_spanned(other, "invalid argument").into_compile_error(),
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)
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}
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}
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}
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let mut inner_fn = parse_macro_input!(function as ItemFn);
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if max_retries > 0 && num_iterations > 1 {
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return TokenStream::from(
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syn::Error::new_spanned(inner_fn, "retries and randomized iterations can't be mixed")
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.into_compile_error(),
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);
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}
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let inner_fn_attributes = mem::take(&mut inner_fn.attrs);
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let inner_fn_name = format_ident!("_{}", inner_fn.sig.ident);
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let outer_fn_name = mem::replace(&mut inner_fn.sig.ident, inner_fn_name.clone());
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let mut outer_fn: ItemFn = if inner_fn.sig.asyncness.is_some() {
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// Pass to the test function the number of app contexts that it needs,
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// based on its parameter list.
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let mut cx_vars = proc_macro2::TokenStream::new();
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let mut cx_teardowns = proc_macro2::TokenStream::new();
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let mut inner_fn_args = proc_macro2::TokenStream::new();
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for (ix, arg) in inner_fn.sig.inputs.iter().enumerate() {
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if let FnArg::Typed(arg) = arg {
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if let Type::Path(ty) = &*arg.ty {
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let last_segment = ty.path.segments.last();
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match last_segment.map(|s| s.ident.to_string()).as_deref() {
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Some("StdRng") => {
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inner_fn_args.extend(quote!(rand::SeedableRng::seed_from_u64(seed),));
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continue;
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}
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Some("Arc") => {
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if let syn::PathArguments::AngleBracketed(args) =
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&last_segment.unwrap().arguments
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{
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if let Some(syn::GenericArgument::Type(syn::Type::Path(ty))) =
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args.args.last()
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{
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let last_segment = ty.path.segments.last();
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if let Some("Deterministic") =
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last_segment.map(|s| s.ident.to_string()).as_deref()
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{
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inner_fn_args.extend(quote!(deterministic.clone(),));
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continue;
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}
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}
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}
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}
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_ => {}
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}
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} else if let Type::Reference(ty) = &*arg.ty {
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if let Type::Path(ty) = &*ty.elem {
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let last_segment = ty.path.segments.last();
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if let Some("TestAppContext") =
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last_segment.map(|s| s.ident.to_string()).as_deref()
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{
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let first_entity_id = ix * 100_000;
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let cx_varname = format_ident!("cx_{}", ix);
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cx_vars.extend(quote!(
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let mut #cx_varname = #namespace::TestAppContext::new(
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foreground_platform.clone(),
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cx.platform().clone(),
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deterministic.build_foreground(#ix),
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deterministic.build_background(),
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cx.font_cache().clone(),
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cx.leak_detector(),
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#first_entity_id,
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stringify!(#outer_fn_name).to_string(),
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);
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));
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cx_teardowns.extend(quote!(
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#cx_varname.update(|cx| cx.remove_all_windows());
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deterministic.run_until_parked();
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#cx_varname.update(|cx| cx.clear_globals());
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));
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inner_fn_args.extend(quote!(&mut #cx_varname,));
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continue;
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}
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}
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}
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}
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return TokenStream::from(
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syn::Error::new_spanned(arg, "invalid argument").into_compile_error(),
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);
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}
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parse_quote! {
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#[test]
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fn #outer_fn_name() {
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#inner_fn
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#namespace::test::run_test(
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#num_iterations as u64,
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#starting_seed as u64,
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#max_retries,
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#detect_nondeterminism,
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&mut |cx, foreground_platform, deterministic, seed| {
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#cx_vars
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cx.foreground().run(#inner_fn_name(#inner_fn_args));
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#cx_teardowns
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},
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#on_failure_fn_name,
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stringify!(#outer_fn_name).to_string(),
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);
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}
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}
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} else {
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// Pass to the test function the number of app contexts that it needs,
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// based on its parameter list.
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let mut cx_vars = proc_macro2::TokenStream::new();
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let mut cx_teardowns = proc_macro2::TokenStream::new();
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let mut inner_fn_args = proc_macro2::TokenStream::new();
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for (ix, arg) in inner_fn.sig.inputs.iter().enumerate() {
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if let FnArg::Typed(arg) = arg {
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if let Type::Path(ty) = &*arg.ty {
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let last_segment = ty.path.segments.last();
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if let Some("StdRng") = last_segment.map(|s| s.ident.to_string()).as_deref() {
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inner_fn_args.extend(quote!(rand::SeedableRng::seed_from_u64(seed),));
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continue;
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}
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} else if let Type::Reference(ty) = &*arg.ty {
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if let Type::Path(ty) = &*ty.elem {
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let last_segment = ty.path.segments.last();
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match last_segment.map(|s| s.ident.to_string()).as_deref() {
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Some("AppContext") => {
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inner_fn_args.extend(quote!(cx,));
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continue;
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}
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Some("TestAppContext") => {
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let first_entity_id = ix * 100_000;
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let cx_varname = format_ident!("cx_{}", ix);
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cx_vars.extend(quote!(
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let mut #cx_varname = #namespace::TestAppContext::new(
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foreground_platform.clone(),
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cx.platform().clone(),
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deterministic.build_foreground(#ix),
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deterministic.build_background(),
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cx.font_cache().clone(),
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cx.leak_detector(),
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#first_entity_id,
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stringify!(#outer_fn_name).to_string(),
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);
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));
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cx_teardowns.extend(quote!(
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#cx_varname.update(|cx| cx.remove_all_windows());
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deterministic.run_until_parked();
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#cx_varname.update(|cx| cx.clear_globals());
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));
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inner_fn_args.extend(quote!(&mut #cx_varname,));
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continue;
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}
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_ => {}
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}
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}
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}
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}
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return TokenStream::from(
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syn::Error::new_spanned(arg, "invalid argument").into_compile_error(),
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);
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}
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parse_quote! {
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#[test]
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fn #outer_fn_name() {
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#inner_fn
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#namespace::test::run_test(
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#num_iterations as u64,
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#starting_seed as u64,
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#max_retries,
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#detect_nondeterminism,
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&mut |cx, foreground_platform, deterministic, seed| {
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#cx_vars
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#inner_fn_name(#inner_fn_args);
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#cx_teardowns
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},
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#on_failure_fn_name,
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stringify!(#outer_fn_name).to_string(),
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);
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}
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}
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};
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outer_fn.attrs.extend(inner_fn_attributes);
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TokenStream::from(quote!(#outer_fn))
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}
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fn parse_int(literal: &Lit) -> Result<usize, TokenStream> {
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let result = if let Lit::Int(int) = &literal {
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int.base10_parse()
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} else {
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Err(syn::Error::new(literal.span(), "must be an integer"))
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};
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result.map_err(|err| TokenStream::from(err.into_compile_error()))
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}
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fn parse_bool(literal: &Lit) -> Result<bool, TokenStream> {
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let result = if let Lit::Bool(result) = &literal {
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Ok(result.value)
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} else {
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Err(syn::Error::new(literal.span(), "must be a boolean"))
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};
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result.map_err(|err| TokenStream::from(err.into_compile_error()))
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}
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