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|
#![deny(unused_must_use)]
use crate::diagnostics::diagnostic_builder::{DiagnosticDeriveBuilder, DiagnosticDeriveKind};
use crate::diagnostics::error::{span_err, DiagnosticDeriveError};
use crate::diagnostics::utils::{build_field_mapping, SetOnce};
use proc_macro2::TokenStream;
use quote::quote;
use syn::spanned::Spanned;
use synstructure::Structure;
/// The central struct for constructing the `into_diagnostic` method from an annotated struct.
pub(crate) struct SessionDiagnosticDerive<'a> {
structure: Structure<'a>,
sess: syn::Ident,
builder: DiagnosticDeriveBuilder,
}
impl<'a> SessionDiagnosticDerive<'a> {
pub(crate) fn new(diag: syn::Ident, sess: syn::Ident, structure: Structure<'a>) -> Self {
Self {
builder: DiagnosticDeriveBuilder {
diag,
fields: build_field_mapping(&structure),
kind: None,
code: None,
slug: None,
},
sess,
structure,
}
}
pub(crate) fn into_tokens(self) -> TokenStream {
let SessionDiagnosticDerive { mut structure, sess, mut builder } = self;
let ast = structure.ast();
let (implementation, param_ty) = {
if let syn::Data::Struct(..) = ast.data {
let preamble = builder.preamble(&structure);
let (attrs, args) = builder.body(&mut structure);
let span = ast.span().unwrap();
let diag = &builder.diag;
let init = match (builder.kind.value(), builder.slug.value()) {
(None, _) => {
span_err(span, "diagnostic kind not specified")
.help("use the `#[error(...)]` attribute to create an error")
.emit();
return DiagnosticDeriveError::ErrorHandled.to_compile_error();
}
(Some(kind), None) => {
span_err(span, "diagnostic slug not specified")
.help(&format!(
"specify the slug as the first argument to the attribute, such as \
`#[{}(typeck::example_error)]`",
kind.descr()
))
.emit();
return DiagnosticDeriveError::ErrorHandled.to_compile_error();
}
(Some(DiagnosticDeriveKind::Lint), _) => {
span_err(span, "only `#[error(..)]` and `#[warning(..)]` are supported")
.help("use the `#[error(...)]` attribute to create a error")
.emit();
return DiagnosticDeriveError::ErrorHandled.to_compile_error();
}
(Some(DiagnosticDeriveKind::Error), Some(slug)) => {
quote! {
let mut #diag = #sess.struct_err(rustc_errors::fluent::#slug);
}
}
(Some(DiagnosticDeriveKind::Warn), Some(slug)) => {
quote! {
let mut #diag = #sess.struct_warn(rustc_errors::fluent::#slug);
}
}
};
let implementation = quote! {
#init
#preamble
match self {
#attrs
}
match self {
#args
}
#diag
};
let param_ty = match builder.kind {
Some((DiagnosticDeriveKind::Error, _)) => {
quote! { rustc_errors::ErrorGuaranteed }
}
Some((DiagnosticDeriveKind::Lint | DiagnosticDeriveKind::Warn, _)) => {
quote! { () }
}
_ => unreachable!(),
};
(implementation, param_ty)
} else {
span_err(
ast.span().unwrap(),
"`#[derive(SessionDiagnostic)]` can only be used on structs",
)
.emit();
let implementation = DiagnosticDeriveError::ErrorHandled.to_compile_error();
let param_ty = quote! { rustc_errors::ErrorGuaranteed };
(implementation, param_ty)
}
};
structure.gen_impl(quote! {
gen impl<'__session_diagnostic_sess> rustc_session::SessionDiagnostic<'__session_diagnostic_sess, #param_ty>
for @Self
{
fn into_diagnostic(
self,
#sess: &'__session_diagnostic_sess rustc_session::parse::ParseSess
) -> rustc_errors::DiagnosticBuilder<'__session_diagnostic_sess, #param_ty> {
use rustc_errors::IntoDiagnosticArg;
#implementation
}
}
})
}
}
/// The central struct for constructing the `decorate_lint` method from an annotated struct.
pub(crate) struct LintDiagnosticDerive<'a> {
structure: Structure<'a>,
builder: DiagnosticDeriveBuilder,
}
impl<'a> LintDiagnosticDerive<'a> {
pub(crate) fn new(diag: syn::Ident, structure: Structure<'a>) -> Self {
Self {
builder: DiagnosticDeriveBuilder {
diag,
fields: build_field_mapping(&structure),
kind: None,
code: None,
slug: None,
},
structure,
}
}
pub(crate) fn into_tokens(self) -> TokenStream {
let LintDiagnosticDerive { mut structure, mut builder } = self;
let ast = structure.ast();
let implementation = {
if let syn::Data::Struct(..) = ast.data {
let preamble = builder.preamble(&structure);
let (attrs, args) = builder.body(&mut structure);
let diag = &builder.diag;
let span = ast.span().unwrap();
let init = match (builder.kind.value(), builder.slug.value()) {
(None, _) => {
span_err(span, "diagnostic kind not specified")
.help("use the `#[error(...)]` attribute to create an error")
.emit();
return DiagnosticDeriveError::ErrorHandled.to_compile_error();
}
(Some(kind), None) => {
span_err(span, "diagnostic slug not specified")
.help(&format!(
"specify the slug as the first argument to the attribute, such as \
`#[{}(typeck::example_error)]`",
kind.descr()
))
.emit();
return DiagnosticDeriveError::ErrorHandled.to_compile_error();
}
(Some(DiagnosticDeriveKind::Error | DiagnosticDeriveKind::Warn), _) => {
span_err(span, "only `#[lint(..)]` is supported")
.help("use the `#[lint(...)]` attribute to create a lint")
.emit();
return DiagnosticDeriveError::ErrorHandled.to_compile_error();
}
(Some(DiagnosticDeriveKind::Lint), Some(slug)) => {
quote! {
let mut #diag = #diag.build(rustc_errors::fluent::#slug);
}
}
};
let implementation = quote! {
#init
#preamble
match self {
#attrs
}
match self {
#args
}
#diag.emit();
};
implementation
} else {
span_err(
ast.span().unwrap(),
"`#[derive(LintDiagnostic)]` can only be used on structs",
)
.emit();
DiagnosticDeriveError::ErrorHandled.to_compile_error()
}
};
let diag = &builder.diag;
structure.gen_impl(quote! {
gen impl<'__a> rustc_errors::DecorateLint<'__a, ()> for @Self {
fn decorate_lint(self, #diag: rustc_errors::LintDiagnosticBuilder<'__a, ()>) {
use rustc_errors::IntoDiagnosticArg;
#implementation
}
}
})
}
}
|
