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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /third_party/rust/serde_derive/src/internals/receiver.rs | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/serde_derive/src/internals/receiver.rs')
-rw-r--r-- | third_party/rust/serde_derive/src/internals/receiver.rs | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/third_party/rust/serde_derive/src/internals/receiver.rs b/third_party/rust/serde_derive/src/internals/receiver.rs new file mode 100644 index 0000000000..fa2a77d240 --- /dev/null +++ b/third_party/rust/serde_derive/src/internals/receiver.rs @@ -0,0 +1,292 @@ +use crate::internals::respan::respan; +use proc_macro2::Span; +use quote::ToTokens; +use std::mem; +use syn::punctuated::Punctuated; +use syn::{ + parse_quote, Data, DeriveInput, Expr, ExprPath, GenericArgument, GenericParam, Generics, Macro, + Path, PathArguments, QSelf, ReturnType, Token, Type, TypeParamBound, TypePath, WherePredicate, +}; + +pub fn replace_receiver(input: &mut DeriveInput) { + let self_ty = { + let ident = &input.ident; + let ty_generics = input.generics.split_for_impl().1; + parse_quote!(#ident #ty_generics) + }; + let mut visitor = ReplaceReceiver(&self_ty); + visitor.visit_generics_mut(&mut input.generics); + visitor.visit_data_mut(&mut input.data); +} + +struct ReplaceReceiver<'a>(&'a TypePath); + +impl ReplaceReceiver<'_> { + fn self_ty(&self, span: Span) -> TypePath { + let tokens = self.0.to_token_stream(); + let respanned = respan(tokens, span); + syn::parse2(respanned).unwrap() + } + + fn self_to_qself(&self, qself: &mut Option<QSelf>, path: &mut Path) { + if path.leading_colon.is_some() || path.segments[0].ident != "Self" { + return; + } + + if path.segments.len() == 1 { + self.self_to_expr_path(path); + return; + } + + let span = path.segments[0].ident.span(); + *qself = Some(QSelf { + lt_token: Token![<](span), + ty: Box::new(Type::Path(self.self_ty(span))), + position: 0, + as_token: None, + gt_token: Token![>](span), + }); + + path.leading_colon = Some(**path.segments.pairs().next().unwrap().punct().unwrap()); + + let segments = mem::replace(&mut path.segments, Punctuated::new()); + path.segments = segments.into_pairs().skip(1).collect(); + } + + fn self_to_expr_path(&self, path: &mut Path) { + let self_ty = self.self_ty(path.segments[0].ident.span()); + let variant = mem::replace(path, self_ty.path); + for segment in &mut path.segments { + if let PathArguments::AngleBracketed(bracketed) = &mut segment.arguments { + if bracketed.colon2_token.is_none() && !bracketed.args.is_empty() { + bracketed.colon2_token = Some(<Token![::]>::default()); + } + } + } + if variant.segments.len() > 1 { + path.segments.push_punct(<Token![::]>::default()); + path.segments.extend(variant.segments.into_pairs().skip(1)); + } + } +} + +impl ReplaceReceiver<'_> { + // `Self` -> `Receiver` + fn visit_type_mut(&mut self, ty: &mut Type) { + let span = if let Type::Path(node) = ty { + if node.qself.is_none() && node.path.is_ident("Self") { + node.path.segments[0].ident.span() + } else { + self.visit_type_path_mut(node); + return; + } + } else { + self.visit_type_mut_impl(ty); + return; + }; + *ty = self.self_ty(span).into(); + } + + // `Self::Assoc` -> `<Receiver>::Assoc` + fn visit_type_path_mut(&mut self, ty: &mut TypePath) { + if ty.qself.is_none() { + self.self_to_qself(&mut ty.qself, &mut ty.path); + } + self.visit_type_path_mut_impl(ty); + } + + // `Self::method` -> `<Receiver>::method` + fn visit_expr_path_mut(&mut self, expr: &mut ExprPath) { + if expr.qself.is_none() { + self.self_to_qself(&mut expr.qself, &mut expr.path); + } + self.visit_expr_path_mut_impl(expr); + } + + // Everything below is simply traversing the syntax tree. + + fn visit_type_mut_impl(&mut self, ty: &mut Type) { + match ty { + #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))] + Type::Array(ty) => { + self.visit_type_mut(&mut ty.elem); + self.visit_expr_mut(&mut ty.len); + } + Type::BareFn(ty) => { + for arg in &mut ty.inputs { + self.visit_type_mut(&mut arg.ty); + } + self.visit_return_type_mut(&mut ty.output); + } + Type::Group(ty) => self.visit_type_mut(&mut ty.elem), + Type::ImplTrait(ty) => { + for bound in &mut ty.bounds { + self.visit_type_param_bound_mut(bound); + } + } + Type::Macro(ty) => self.visit_macro_mut(&mut ty.mac), + Type::Paren(ty) => self.visit_type_mut(&mut ty.elem), + Type::Path(ty) => { + if let Some(qself) = &mut ty.qself { + self.visit_type_mut(&mut qself.ty); + } + self.visit_path_mut(&mut ty.path); + } + Type::Ptr(ty) => self.visit_type_mut(&mut ty.elem), + Type::Reference(ty) => self.visit_type_mut(&mut ty.elem), + Type::Slice(ty) => self.visit_type_mut(&mut ty.elem), + Type::TraitObject(ty) => { + for bound in &mut ty.bounds { + self.visit_type_param_bound_mut(bound); + } + } + Type::Tuple(ty) => { + for elem in &mut ty.elems { + self.visit_type_mut(elem); + } + } + + Type::Infer(_) | Type::Never(_) | Type::Verbatim(_) => {} + + _ => {} + } + } + + fn visit_type_path_mut_impl(&mut self, ty: &mut TypePath) { + if let Some(qself) = &mut ty.qself { + self.visit_type_mut(&mut qself.ty); + } + self.visit_path_mut(&mut ty.path); + } + + fn visit_expr_path_mut_impl(&mut self, expr: &mut ExprPath) { + if let Some(qself) = &mut expr.qself { + self.visit_type_mut(&mut qself.ty); + } + self.visit_path_mut(&mut expr.path); + } + + fn visit_path_mut(&mut self, path: &mut Path) { + for segment in &mut path.segments { + self.visit_path_arguments_mut(&mut segment.arguments); + } + } + + fn visit_path_arguments_mut(&mut self, arguments: &mut PathArguments) { + match arguments { + PathArguments::None => {} + PathArguments::AngleBracketed(arguments) => { + for arg in &mut arguments.args { + match arg { + #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))] + GenericArgument::Type(arg) => self.visit_type_mut(arg), + GenericArgument::AssocType(arg) => self.visit_type_mut(&mut arg.ty), + GenericArgument::Lifetime(_) + | GenericArgument::Const(_) + | GenericArgument::AssocConst(_) + | GenericArgument::Constraint(_) => {} + _ => {} + } + } + } + PathArguments::Parenthesized(arguments) => { + for argument in &mut arguments.inputs { + self.visit_type_mut(argument); + } + self.visit_return_type_mut(&mut arguments.output); + } + } + } + + fn visit_return_type_mut(&mut self, return_type: &mut ReturnType) { + match return_type { + ReturnType::Default => {} + ReturnType::Type(_, output) => self.visit_type_mut(output), + } + } + + fn visit_type_param_bound_mut(&mut self, bound: &mut TypeParamBound) { + match bound { + #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))] + TypeParamBound::Trait(bound) => self.visit_path_mut(&mut bound.path), + TypeParamBound::Lifetime(_) | TypeParamBound::Verbatim(_) => {} + _ => {} + } + } + + fn visit_generics_mut(&mut self, generics: &mut Generics) { + for param in &mut generics.params { + match param { + GenericParam::Type(param) => { + for bound in &mut param.bounds { + self.visit_type_param_bound_mut(bound); + } + } + GenericParam::Lifetime(_) | GenericParam::Const(_) => {} + } + } + if let Some(where_clause) = &mut generics.where_clause { + for predicate in &mut where_clause.predicates { + match predicate { + #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))] + WherePredicate::Type(predicate) => { + self.visit_type_mut(&mut predicate.bounded_ty); + for bound in &mut predicate.bounds { + self.visit_type_param_bound_mut(bound); + } + } + WherePredicate::Lifetime(_) => {} + _ => {} + } + } + } + } + + fn visit_data_mut(&mut self, data: &mut Data) { + match data { + Data::Struct(data) => { + for field in &mut data.fields { + self.visit_type_mut(&mut field.ty); + } + } + Data::Enum(data) => { + for variant in &mut data.variants { + for field in &mut variant.fields { + self.visit_type_mut(&mut field.ty); + } + } + } + Data::Union(_) => {} + } + } + + fn visit_expr_mut(&mut self, expr: &mut Expr) { + match expr { + Expr::Binary(expr) => { + self.visit_expr_mut(&mut expr.left); + self.visit_expr_mut(&mut expr.right); + } + Expr::Call(expr) => { + self.visit_expr_mut(&mut expr.func); + for arg in &mut expr.args { + self.visit_expr_mut(arg); + } + } + Expr::Cast(expr) => { + self.visit_expr_mut(&mut expr.expr); + self.visit_type_mut(&mut expr.ty); + } + Expr::Field(expr) => self.visit_expr_mut(&mut expr.base), + Expr::Index(expr) => { + self.visit_expr_mut(&mut expr.expr); + self.visit_expr_mut(&mut expr.index); + } + Expr::Paren(expr) => self.visit_expr_mut(&mut expr.expr), + Expr::Path(expr) => self.visit_expr_path_mut(expr), + Expr::Unary(expr) => self.visit_expr_mut(&mut expr.expr), + _ => {} + } + } + + fn visit_macro_mut(&mut self, _mac: &mut Macro) {} +} |