| //! HIR pretty-printing is layered on top of AST pretty-printing. A number of |
| //! the definitions in this file have equivalents in `rustc_ast_pretty`. |
| |
| // tidy-alphabetical-start |
| #![recursion_limit = "256"] |
| // tidy-alphabetical-end |
| |
| use std::cell::Cell; |
| use std::vec; |
| |
| use rustc_abi::ExternAbi; |
| use rustc_ast::util::parser::{self, ExprPrecedence, Fixity}; |
| use rustc_ast::{DUMMY_NODE_ID, DelimArgs}; |
| use rustc_ast_pretty::pp::Breaks::{Consistent, Inconsistent}; |
| use rustc_ast_pretty::pp::{self, BoxMarker, Breaks}; |
| use rustc_ast_pretty::pprust::state::MacHeader; |
| use rustc_ast_pretty::pprust::{Comments, PrintState}; |
| use rustc_hir::attrs::{AttributeKind, PrintAttribute}; |
| use rustc_hir::{ |
| BindingMode, ByRef, ConstArgKind, GenericArg, GenericBound, GenericParam, GenericParamKind, |
| HirId, ImplicitSelfKind, LifetimeParamKind, Node, PatKind, PreciseCapturingArg, RangeEnd, Term, |
| TyPatKind, |
| }; |
| use rustc_span::source_map::SourceMap; |
| use rustc_span::{FileName, Ident, Span, Symbol, kw, sym}; |
| use {rustc_ast as ast, rustc_hir as hir}; |
| |
| pub fn id_to_string(cx: &dyn rustc_hir::intravisit::HirTyCtxt<'_>, hir_id: HirId) -> String { |
| to_string(&cx, |s| s.print_node(cx.hir_node(hir_id))) |
| } |
| |
| pub enum AnnNode<'a> { |
| Name(&'a Symbol), |
| Block(&'a hir::Block<'a>), |
| Item(&'a hir::Item<'a>), |
| SubItem(HirId), |
| Expr(&'a hir::Expr<'a>), |
| Pat(&'a hir::Pat<'a>), |
| TyPat(&'a hir::TyPat<'a>), |
| Arm(&'a hir::Arm<'a>), |
| } |
| |
| pub enum Nested { |
| Item(hir::ItemId), |
| TraitItem(hir::TraitItemId), |
| ImplItem(hir::ImplItemId), |
| ForeignItem(hir::ForeignItemId), |
| Body(hir::BodyId), |
| BodyParamPat(hir::BodyId, usize), |
| } |
| |
| pub trait PpAnn { |
| fn nested(&self, _state: &mut State<'_>, _nested: Nested) {} |
| fn pre(&self, _state: &mut State<'_>, _node: AnnNode<'_>) {} |
| fn post(&self, _state: &mut State<'_>, _node: AnnNode<'_>) {} |
| } |
| |
| impl PpAnn for &dyn rustc_hir::intravisit::HirTyCtxt<'_> { |
| fn nested(&self, state: &mut State<'_>, nested: Nested) { |
| match nested { |
| Nested::Item(id) => state.print_item(self.hir_item(id)), |
| Nested::TraitItem(id) => state.print_trait_item(self.hir_trait_item(id)), |
| Nested::ImplItem(id) => state.print_impl_item(self.hir_impl_item(id)), |
| Nested::ForeignItem(id) => state.print_foreign_item(self.hir_foreign_item(id)), |
| Nested::Body(id) => state.print_expr(self.hir_body(id).value), |
| Nested::BodyParamPat(id, i) => state.print_pat(self.hir_body(id).params[i].pat), |
| } |
| } |
| } |
| |
| pub struct State<'a> { |
| pub s: pp::Printer, |
| comments: Option<Comments<'a>>, |
| attrs: &'a dyn Fn(HirId) -> &'a [hir::Attribute], |
| ann: &'a (dyn PpAnn + 'a), |
| } |
| |
| impl<'a> State<'a> { |
| fn attrs(&self, id: HirId) -> &'a [hir::Attribute] { |
| (self.attrs)(id) |
| } |
| |
| fn precedence(&self, expr: &hir::Expr<'_>) -> ExprPrecedence { |
| let has_attr = |id: HirId| !self.attrs(id).is_empty(); |
| expr.precedence(&has_attr) |
| } |
| |
| fn print_attrs(&mut self, attrs: &[hir::Attribute]) { |
| if attrs.is_empty() { |
| return; |
| } |
| |
| for attr in attrs { |
| self.print_attribute_as_style(attr, ast::AttrStyle::Outer); |
| } |
| self.hardbreak_if_not_bol(); |
| } |
| |
| /// Print a single attribute as if it has style `style`, disregarding the |
| /// actual style of the attribute. |
| fn print_attribute_as_style(&mut self, attr: &hir::Attribute, style: ast::AttrStyle) { |
| match &attr { |
| hir::Attribute::Unparsed(unparsed) => { |
| self.maybe_print_comment(unparsed.span.lo()); |
| match style { |
| ast::AttrStyle::Inner => self.word("#!["), |
| ast::AttrStyle::Outer => self.word("#["), |
| } |
| self.print_attr_item(&unparsed, unparsed.span); |
| self.word("]"); |
| self.hardbreak() |
| } |
| hir::Attribute::Parsed(AttributeKind::DocComment { kind, comment, .. }) => { |
| self.word(rustc_ast_pretty::pprust::state::doc_comment_to_string( |
| *kind, style, *comment, |
| )); |
| self.hardbreak() |
| } |
| hir::Attribute::Parsed(pa) => { |
| match style { |
| ast::AttrStyle::Inner => self.word("#![attr = "), |
| ast::AttrStyle::Outer => self.word("#[attr = "), |
| } |
| pa.print_attribute(self); |
| self.word("]"); |
| self.hardbreak() |
| } |
| } |
| } |
| |
| fn print_attr_item(&mut self, item: &hir::AttrItem, span: Span) { |
| let ib = self.ibox(0); |
| let path = ast::Path { |
| span, |
| segments: item |
| .path |
| .segments |
| .iter() |
| .map(|i| ast::PathSegment { ident: *i, args: None, id: DUMMY_NODE_ID }) |
| .collect(), |
| tokens: None, |
| }; |
| |
| match &item.args { |
| hir::AttrArgs::Delimited(DelimArgs { dspan: _, delim, tokens }) => self |
| .print_mac_common( |
| Some(MacHeader::Path(&path)), |
| false, |
| None, |
| *delim, |
| None, |
| &tokens, |
| true, |
| span, |
| ), |
| hir::AttrArgs::Empty => { |
| PrintState::print_path(self, &path, false, 0); |
| } |
| hir::AttrArgs::Eq { eq_span: _, expr } => { |
| PrintState::print_path(self, &path, false, 0); |
| self.space(); |
| self.word_space("="); |
| let token_str = self.meta_item_lit_to_string(expr); |
| self.word(token_str); |
| } |
| } |
| self.end(ib); |
| } |
| |
| fn print_node(&mut self, node: Node<'_>) { |
| match node { |
| Node::Param(a) => self.print_param(a), |
| Node::Item(a) => self.print_item(a), |
| Node::ForeignItem(a) => self.print_foreign_item(a), |
| Node::TraitItem(a) => self.print_trait_item(a), |
| Node::ImplItem(a) => self.print_impl_item(a), |
| Node::Variant(a) => self.print_variant(a), |
| Node::AnonConst(a) => self.print_anon_const(a), |
| Node::ConstBlock(a) => self.print_inline_const(a), |
| Node::ConstArg(a) => self.print_const_arg(a), |
| Node::Expr(a) => self.print_expr(a), |
| Node::ExprField(a) => self.print_expr_field(a), |
| Node::Stmt(a) => self.print_stmt(a), |
| Node::PathSegment(a) => self.print_path_segment(a), |
| Node::Ty(a) => self.print_type(a), |
| Node::AssocItemConstraint(a) => self.print_assoc_item_constraint(a), |
| Node::TraitRef(a) => self.print_trait_ref(a), |
| Node::OpaqueTy(_) => panic!("cannot print Node::OpaqueTy"), |
| Node::Pat(a) => self.print_pat(a), |
| Node::TyPat(a) => self.print_ty_pat(a), |
| Node::PatField(a) => self.print_patfield(a), |
| Node::PatExpr(a) => self.print_pat_expr(a), |
| Node::Arm(a) => self.print_arm(a), |
| Node::Infer(_) => self.word("_"), |
| Node::PreciseCapturingNonLifetimeArg(param) => self.print_ident(param.ident), |
| Node::Block(a) => { |
| // Containing cbox, will be closed by print-block at `}`. |
| let cb = self.cbox(INDENT_UNIT); |
| // Head-ibox, will be closed by print-block after `{`. |
| let ib = self.ibox(0); |
| self.print_block(a, cb, ib); |
| } |
| Node::Lifetime(a) => self.print_lifetime(a), |
| Node::GenericParam(_) => panic!("cannot print Node::GenericParam"), |
| Node::Field(_) => panic!("cannot print Node::Field"), |
| // These cases do not carry enough information in the |
| // `hir_map` to reconstruct their full structure for pretty |
| // printing. |
| Node::Ctor(..) => panic!("cannot print isolated Ctor"), |
| Node::LetStmt(a) => self.print_local_decl(a), |
| Node::Crate(..) => panic!("cannot print Crate"), |
| Node::WherePredicate(pred) => self.print_where_predicate(pred), |
| Node::Synthetic => unreachable!(), |
| Node::Err(_) => self.word("/*ERROR*/"), |
| } |
| } |
| |
| fn print_generic_arg(&mut self, generic_arg: &GenericArg<'_>, elide_lifetimes: bool) { |
| match generic_arg { |
| GenericArg::Lifetime(lt) if !elide_lifetimes => self.print_lifetime(lt), |
| GenericArg::Lifetime(_) => {} |
| GenericArg::Type(ty) => self.print_type(ty.as_unambig_ty()), |
| GenericArg::Const(ct) => self.print_const_arg(ct.as_unambig_ct()), |
| GenericArg::Infer(_inf) => self.word("_"), |
| } |
| } |
| } |
| |
| impl std::ops::Deref for State<'_> { |
| type Target = pp::Printer; |
| fn deref(&self) -> &Self::Target { |
| &self.s |
| } |
| } |
| |
| impl std::ops::DerefMut for State<'_> { |
| fn deref_mut(&mut self) -> &mut Self::Target { |
| &mut self.s |
| } |
| } |
| |
| impl<'a> PrintState<'a> for State<'a> { |
| fn comments(&self) -> Option<&Comments<'a>> { |
| self.comments.as_ref() |
| } |
| |
| fn comments_mut(&mut self) -> Option<&mut Comments<'a>> { |
| self.comments.as_mut() |
| } |
| |
| fn ann_post(&mut self, ident: Ident) { |
| self.ann.post(self, AnnNode::Name(&ident.name)); |
| } |
| |
| fn print_generic_args(&mut self, _: &ast::GenericArgs, _colons_before_params: bool) { |
| panic!("AST generic args printed by HIR pretty-printer"); |
| } |
| } |
| |
| const INDENT_UNIT: isize = 4; |
| |
| /// Requires you to pass an input filename and reader so that |
| /// it can scan the input text for comments to copy forward. |
| pub fn print_crate<'a>( |
| sm: &'a SourceMap, |
| krate: &hir::Mod<'_>, |
| filename: FileName, |
| input: String, |
| attrs: &'a dyn Fn(HirId) -> &'a [hir::Attribute], |
| ann: &'a dyn PpAnn, |
| ) -> String { |
| let mut s = State { |
| s: pp::Printer::new(), |
| comments: Some(Comments::new(sm, filename, input)), |
| attrs, |
| ann, |
| }; |
| |
| // Print all attributes, regardless of actual style, as inner attributes |
| // since this is the crate root with nothing above it to print outer |
| // attributes. |
| for attr in s.attrs(hir::CRATE_HIR_ID) { |
| s.print_attribute_as_style(attr, ast::AttrStyle::Inner); |
| } |
| |
| // When printing the AST, we sometimes need to inject `#[no_std]` here. |
| // Since you can't compile the HIR, it's not necessary. |
| |
| s.print_mod(krate); |
| s.print_remaining_comments(); |
| s.s.eof() |
| } |
| |
| fn to_string<F>(ann: &dyn PpAnn, f: F) -> String |
| where |
| F: FnOnce(&mut State<'_>), |
| { |
| let mut printer = State { s: pp::Printer::new(), comments: None, attrs: &|_| &[], ann }; |
| f(&mut printer); |
| printer.s.eof() |
| } |
| |
| pub fn attribute_to_string(ann: &dyn PpAnn, attr: &hir::Attribute) -> String { |
| to_string(ann, |s| s.print_attribute_as_style(attr, ast::AttrStyle::Outer)) |
| } |
| |
| pub fn ty_to_string(ann: &dyn PpAnn, ty: &hir::Ty<'_>) -> String { |
| to_string(ann, |s| s.print_type(ty)) |
| } |
| |
| pub fn qpath_to_string(ann: &dyn PpAnn, segment: &hir::QPath<'_>) -> String { |
| to_string(ann, |s| s.print_qpath(segment, false)) |
| } |
| |
| pub fn pat_to_string(ann: &dyn PpAnn, pat: &hir::Pat<'_>) -> String { |
| to_string(ann, |s| s.print_pat(pat)) |
| } |
| |
| pub fn expr_to_string(ann: &dyn PpAnn, pat: &hir::Expr<'_>) -> String { |
| to_string(ann, |s| s.print_expr(pat)) |
| } |
| |
| pub fn item_to_string(ann: &dyn PpAnn, pat: &hir::Item<'_>) -> String { |
| to_string(ann, |s| s.print_item(pat)) |
| } |
| |
| impl<'a> State<'a> { |
| fn bclose_maybe_open(&mut self, span: rustc_span::Span, cb: Option<BoxMarker>) { |
| self.maybe_print_comment(span.hi()); |
| self.break_offset_if_not_bol(1, -INDENT_UNIT); |
| self.word("}"); |
| if let Some(cb) = cb { |
| self.end(cb); |
| } |
| } |
| |
| fn bclose(&mut self, span: rustc_span::Span, cb: BoxMarker) { |
| self.bclose_maybe_open(span, Some(cb)) |
| } |
| |
| fn commasep_cmnt<T, F, G>(&mut self, b: Breaks, elts: &[T], mut op: F, mut get_span: G) |
| where |
| F: FnMut(&mut State<'_>, &T), |
| G: FnMut(&T) -> rustc_span::Span, |
| { |
| let rb = self.rbox(0, b); |
| let len = elts.len(); |
| let mut i = 0; |
| for elt in elts { |
| self.maybe_print_comment(get_span(elt).hi()); |
| op(self, elt); |
| i += 1; |
| if i < len { |
| self.word(","); |
| self.maybe_print_trailing_comment(get_span(elt), Some(get_span(&elts[i]).hi())); |
| self.space_if_not_bol(); |
| } |
| } |
| self.end(rb); |
| } |
| |
| fn commasep_exprs(&mut self, b: Breaks, exprs: &[hir::Expr<'_>]) { |
| self.commasep_cmnt(b, exprs, |s, e| s.print_expr(e), |e| e.span); |
| } |
| |
| fn print_mod(&mut self, _mod: &hir::Mod<'_>) { |
| for &item_id in _mod.item_ids { |
| self.ann.nested(self, Nested::Item(item_id)); |
| } |
| } |
| |
| fn print_opt_lifetime(&mut self, lifetime: &hir::Lifetime) { |
| if !lifetime.is_elided() { |
| self.print_lifetime(lifetime); |
| self.nbsp(); |
| } |
| } |
| |
| fn print_type(&mut self, ty: &hir::Ty<'_>) { |
| self.maybe_print_comment(ty.span.lo()); |
| let ib = self.ibox(0); |
| match ty.kind { |
| hir::TyKind::Slice(ty) => { |
| self.word("["); |
| self.print_type(ty); |
| self.word("]"); |
| } |
| hir::TyKind::Ptr(ref mt) => { |
| self.word("*"); |
| self.print_mt(mt, true); |
| } |
| hir::TyKind::Ref(lifetime, ref mt) => { |
| self.word("&"); |
| self.print_opt_lifetime(lifetime); |
| self.print_mt(mt, false); |
| } |
| hir::TyKind::Never => { |
| self.word("!"); |
| } |
| hir::TyKind::Tup(elts) => { |
| self.popen(); |
| self.commasep(Inconsistent, elts, |s, ty| s.print_type(ty)); |
| if elts.len() == 1 { |
| self.word(","); |
| } |
| self.pclose(); |
| } |
| hir::TyKind::FnPtr(f) => { |
| self.print_ty_fn(f.abi, f.safety, f.decl, None, f.generic_params, f.param_idents); |
| } |
| hir::TyKind::UnsafeBinder(unsafe_binder) => { |
| self.print_unsafe_binder(unsafe_binder); |
| } |
| hir::TyKind::OpaqueDef(..) => self.word("/*impl Trait*/"), |
| hir::TyKind::TraitAscription(bounds) => { |
| self.print_bounds("impl", bounds); |
| } |
| hir::TyKind::Path(ref qpath) => self.print_qpath(qpath, false), |
| hir::TyKind::TraitObject(bounds, lifetime) => { |
| let syntax = lifetime.tag(); |
| match syntax { |
| ast::TraitObjectSyntax::Dyn => self.word_nbsp("dyn"), |
| ast::TraitObjectSyntax::None => {} |
| } |
| let mut first = true; |
| for bound in bounds { |
| if first { |
| first = false; |
| } else { |
| self.nbsp(); |
| self.word_space("+"); |
| } |
| self.print_poly_trait_ref(bound); |
| } |
| if !lifetime.is_elided() { |
| self.nbsp(); |
| self.word_space("+"); |
| self.print_lifetime(lifetime.pointer()); |
| } |
| } |
| hir::TyKind::Array(ty, ref length) => { |
| self.word("["); |
| self.print_type(ty); |
| self.word("; "); |
| self.print_const_arg(length); |
| self.word("]"); |
| } |
| hir::TyKind::Typeof(ref e) => { |
| self.word("typeof("); |
| self.print_anon_const(e); |
| self.word(")"); |
| } |
| hir::TyKind::Err(_) => { |
| self.popen(); |
| self.word("/*ERROR*/"); |
| self.pclose(); |
| } |
| hir::TyKind::Infer(()) | hir::TyKind::InferDelegation(..) => { |
| self.word("_"); |
| } |
| hir::TyKind::Pat(ty, pat) => { |
| self.print_type(ty); |
| self.word(" is "); |
| self.print_ty_pat(pat); |
| } |
| } |
| self.end(ib) |
| } |
| |
| fn print_unsafe_binder(&mut self, unsafe_binder: &hir::UnsafeBinderTy<'_>) { |
| let ib = self.ibox(INDENT_UNIT); |
| self.word("unsafe"); |
| self.print_generic_params(unsafe_binder.generic_params); |
| self.nbsp(); |
| self.print_type(unsafe_binder.inner_ty); |
| self.end(ib); |
| } |
| |
| fn print_foreign_item(&mut self, item: &hir::ForeignItem<'_>) { |
| self.hardbreak_if_not_bol(); |
| self.maybe_print_comment(item.span.lo()); |
| self.print_attrs(self.attrs(item.hir_id())); |
| match item.kind { |
| hir::ForeignItemKind::Fn(sig, arg_idents, generics) => { |
| let (cb, ib) = self.head(""); |
| self.print_fn( |
| sig.header, |
| Some(item.ident.name), |
| generics, |
| sig.decl, |
| arg_idents, |
| None, |
| ); |
| self.end(ib); |
| self.word(";"); |
| self.end(cb) |
| } |
| hir::ForeignItemKind::Static(t, m, safety) => { |
| self.print_safety(safety); |
| let (cb, ib) = self.head("static"); |
| if m.is_mut() { |
| self.word_space("mut"); |
| } |
| self.print_ident(item.ident); |
| self.word_space(":"); |
| self.print_type(t); |
| self.word(";"); |
| self.end(ib); |
| self.end(cb) |
| } |
| hir::ForeignItemKind::Type => { |
| let (cb, ib) = self.head("type"); |
| self.print_ident(item.ident); |
| self.word(";"); |
| self.end(ib); |
| self.end(cb) |
| } |
| } |
| } |
| |
| fn print_associated_const( |
| &mut self, |
| ident: Ident, |
| generics: &hir::Generics<'_>, |
| ty: &hir::Ty<'_>, |
| default: Option<hir::BodyId>, |
| ) { |
| self.word_space("const"); |
| self.print_ident(ident); |
| self.print_generic_params(generics.params); |
| self.word_space(":"); |
| self.print_type(ty); |
| if let Some(expr) = default { |
| self.space(); |
| self.word_space("="); |
| self.ann.nested(self, Nested::Body(expr)); |
| } |
| self.print_where_clause(generics); |
| self.word(";") |
| } |
| |
| fn print_associated_type( |
| &mut self, |
| ident: Ident, |
| generics: &hir::Generics<'_>, |
| bounds: Option<hir::GenericBounds<'_>>, |
| ty: Option<&hir::Ty<'_>>, |
| ) { |
| self.word_space("type"); |
| self.print_ident(ident); |
| self.print_generic_params(generics.params); |
| if let Some(bounds) = bounds { |
| self.print_bounds(":", bounds); |
| } |
| self.print_where_clause(generics); |
| if let Some(ty) = ty { |
| self.space(); |
| self.word_space("="); |
| self.print_type(ty); |
| } |
| self.word(";") |
| } |
| |
| fn print_item(&mut self, item: &hir::Item<'_>) { |
| self.hardbreak_if_not_bol(); |
| self.maybe_print_comment(item.span.lo()); |
| let attrs = self.attrs(item.hir_id()); |
| self.print_attrs(attrs); |
| self.ann.pre(self, AnnNode::Item(item)); |
| match item.kind { |
| hir::ItemKind::ExternCrate(orig_name, ident) => { |
| let (cb, ib) = self.head("extern crate"); |
| if let Some(orig_name) = orig_name { |
| self.print_name(orig_name); |
| self.space(); |
| self.word("as"); |
| self.space(); |
| } |
| self.print_ident(ident); |
| self.word(";"); |
| self.end(ib); |
| self.end(cb); |
| } |
| hir::ItemKind::Use(path, kind) => { |
| let (cb, ib) = self.head("use"); |
| self.print_path(path, false); |
| |
| match kind { |
| hir::UseKind::Single(ident) => { |
| if path.segments.last().unwrap().ident != ident { |
| self.space(); |
| self.word_space("as"); |
| self.print_ident(ident); |
| } |
| self.word(";"); |
| } |
| hir::UseKind::Glob => self.word("::*;"), |
| hir::UseKind::ListStem => self.word("::{};"), |
| } |
| self.end(ib); |
| self.end(cb); |
| } |
| hir::ItemKind::Static(m, ident, ty, expr) => { |
| let (cb, ib) = self.head("static"); |
| if m.is_mut() { |
| self.word_space("mut"); |
| } |
| self.print_ident(ident); |
| self.word_space(":"); |
| self.print_type(ty); |
| self.space(); |
| self.end(ib); |
| |
| self.word_space("="); |
| self.ann.nested(self, Nested::Body(expr)); |
| self.word(";"); |
| self.end(cb); |
| } |
| hir::ItemKind::Const(ident, generics, ty, expr) => { |
| let (cb, ib) = self.head("const"); |
| self.print_ident(ident); |
| self.print_generic_params(generics.params); |
| self.word_space(":"); |
| self.print_type(ty); |
| self.space(); |
| self.end(ib); |
| |
| self.word_space("="); |
| self.ann.nested(self, Nested::Body(expr)); |
| self.print_where_clause(generics); |
| self.word(";"); |
| self.end(cb); |
| } |
| hir::ItemKind::Fn { ident, sig, generics, body, .. } => { |
| let (cb, ib) = self.head(""); |
| self.print_fn(sig.header, Some(ident.name), generics, sig.decl, &[], Some(body)); |
| self.word(" "); |
| self.end(ib); |
| self.end(cb); |
| self.ann.nested(self, Nested::Body(body)); |
| } |
| hir::ItemKind::Macro(ident, macro_def, _) => { |
| self.print_mac_def(macro_def, &ident, item.span, |_| {}); |
| } |
| hir::ItemKind::Mod(ident, mod_) => { |
| let (cb, ib) = self.head("mod"); |
| self.print_ident(ident); |
| self.nbsp(); |
| self.bopen(ib); |
| self.print_mod(mod_); |
| self.bclose(item.span, cb); |
| } |
| hir::ItemKind::ForeignMod { abi, items } => { |
| let (cb, ib) = self.head("extern"); |
| self.word_nbsp(abi.to_string()); |
| self.bopen(ib); |
| for &foreign_item in items { |
| self.ann.nested(self, Nested::ForeignItem(foreign_item)); |
| } |
| self.bclose(item.span, cb); |
| } |
| hir::ItemKind::GlobalAsm { asm, .. } => { |
| let (cb, ib) = self.head("global_asm!"); |
| self.print_inline_asm(asm); |
| self.word(";"); |
| self.end(cb); |
| self.end(ib); |
| } |
| hir::ItemKind::TyAlias(ident, generics, ty) => { |
| let (cb, ib) = self.head("type"); |
| self.print_ident(ident); |
| self.print_generic_params(generics.params); |
| self.end(ib); |
| |
| self.print_where_clause(generics); |
| self.space(); |
| self.word_space("="); |
| self.print_type(ty); |
| self.word(";"); |
| self.end(cb); |
| } |
| hir::ItemKind::Enum(ident, generics, ref enum_def) => { |
| self.print_enum_def(ident.name, generics, enum_def, item.span); |
| } |
| hir::ItemKind::Struct(ident, generics, ref struct_def) => { |
| let (cb, ib) = self.head("struct"); |
| self.print_struct(ident.name, generics, struct_def, item.span, true, cb, ib); |
| } |
| hir::ItemKind::Union(ident, generics, ref struct_def) => { |
| let (cb, ib) = self.head("union"); |
| self.print_struct(ident.name, generics, struct_def, item.span, true, cb, ib); |
| } |
| hir::ItemKind::Impl(hir::Impl { generics, of_trait, self_ty, items }) => { |
| let (cb, ib) = self.head(""); |
| |
| let impl_generics = |this: &mut Self| { |
| this.word_nbsp("impl"); |
| if !generics.params.is_empty() { |
| this.print_generic_params(generics.params); |
| this.space(); |
| } |
| }; |
| |
| match of_trait { |
| None => impl_generics(self), |
| Some(&hir::TraitImplHeader { |
| constness, |
| safety, |
| polarity, |
| defaultness, |
| defaultness_span: _, |
| ref trait_ref, |
| }) => { |
| self.print_defaultness(defaultness); |
| self.print_safety(safety); |
| |
| impl_generics(self); |
| |
| if let hir::Constness::Const = constness { |
| self.word_nbsp("const"); |
| } |
| |
| if let hir::ImplPolarity::Negative(_) = polarity { |
| self.word("!"); |
| } |
| |
| self.print_trait_ref(trait_ref); |
| self.space(); |
| self.word_space("for"); |
| } |
| } |
| |
| self.print_type(self_ty); |
| self.print_where_clause(generics); |
| |
| self.space(); |
| self.bopen(ib); |
| for &impl_item in items { |
| self.ann.nested(self, Nested::ImplItem(impl_item)); |
| } |
| self.bclose(item.span, cb); |
| } |
| hir::ItemKind::Trait( |
| constness, |
| is_auto, |
| safety, |
| ident, |
| generics, |
| bounds, |
| trait_items, |
| ) => { |
| let (cb, ib) = self.head(""); |
| self.print_constness(constness); |
| self.print_is_auto(is_auto); |
| self.print_safety(safety); |
| self.word_nbsp("trait"); |
| self.print_ident(ident); |
| self.print_generic_params(generics.params); |
| self.print_bounds(":", bounds); |
| self.print_where_clause(generics); |
| self.word(" "); |
| self.bopen(ib); |
| for &trait_item in trait_items { |
| self.ann.nested(self, Nested::TraitItem(trait_item)); |
| } |
| self.bclose(item.span, cb); |
| } |
| hir::ItemKind::TraitAlias(ident, generics, bounds) => { |
| let (cb, ib) = self.head("trait"); |
| self.print_ident(ident); |
| self.print_generic_params(generics.params); |
| self.nbsp(); |
| self.print_bounds("=", bounds); |
| self.print_where_clause(generics); |
| self.word(";"); |
| self.end(ib); |
| self.end(cb); |
| } |
| } |
| self.ann.post(self, AnnNode::Item(item)) |
| } |
| |
| fn print_trait_ref(&mut self, t: &hir::TraitRef<'_>) { |
| self.print_path(t.path, false); |
| } |
| |
| fn print_formal_generic_params(&mut self, generic_params: &[hir::GenericParam<'_>]) { |
| if !generic_params.is_empty() { |
| self.word("for"); |
| self.print_generic_params(generic_params); |
| self.nbsp(); |
| } |
| } |
| |
| fn print_poly_trait_ref(&mut self, t: &hir::PolyTraitRef<'_>) { |
| let hir::TraitBoundModifiers { constness, polarity } = t.modifiers; |
| match constness { |
| hir::BoundConstness::Never => {} |
| hir::BoundConstness::Always(_) => self.word("const"), |
| hir::BoundConstness::Maybe(_) => self.word("[const]"), |
| } |
| match polarity { |
| hir::BoundPolarity::Positive => {} |
| hir::BoundPolarity::Negative(_) => self.word("!"), |
| hir::BoundPolarity::Maybe(_) => self.word("?"), |
| } |
| self.print_formal_generic_params(t.bound_generic_params); |
| self.print_trait_ref(&t.trait_ref); |
| } |
| |
| fn print_enum_def( |
| &mut self, |
| name: Symbol, |
| generics: &hir::Generics<'_>, |
| enum_def: &hir::EnumDef<'_>, |
| span: rustc_span::Span, |
| ) { |
| let (cb, ib) = self.head("enum"); |
| self.print_name(name); |
| self.print_generic_params(generics.params); |
| self.print_where_clause(generics); |
| self.space(); |
| self.print_variants(enum_def.variants, span, cb, ib); |
| } |
| |
| fn print_variants( |
| &mut self, |
| variants: &[hir::Variant<'_>], |
| span: rustc_span::Span, |
| cb: BoxMarker, |
| ib: BoxMarker, |
| ) { |
| self.bopen(ib); |
| for v in variants { |
| self.space_if_not_bol(); |
| self.maybe_print_comment(v.span.lo()); |
| self.print_attrs(self.attrs(v.hir_id)); |
| let ib = self.ibox(INDENT_UNIT); |
| self.print_variant(v); |
| self.word(","); |
| self.end(ib); |
| self.maybe_print_trailing_comment(v.span, None); |
| } |
| self.bclose(span, cb) |
| } |
| |
| fn print_defaultness(&mut self, defaultness: hir::Defaultness) { |
| match defaultness { |
| hir::Defaultness::Default { .. } => self.word_nbsp("default"), |
| hir::Defaultness::Final => (), |
| } |
| } |
| |
| fn print_struct( |
| &mut self, |
| name: Symbol, |
| generics: &hir::Generics<'_>, |
| struct_def: &hir::VariantData<'_>, |
| span: rustc_span::Span, |
| print_finalizer: bool, |
| cb: BoxMarker, |
| ib: BoxMarker, |
| ) { |
| self.print_name(name); |
| self.print_generic_params(generics.params); |
| match struct_def { |
| hir::VariantData::Tuple(..) | hir::VariantData::Unit(..) => { |
| if let hir::VariantData::Tuple(..) = struct_def { |
| self.popen(); |
| self.commasep(Inconsistent, struct_def.fields(), |s, field| { |
| s.maybe_print_comment(field.span.lo()); |
| s.print_attrs(s.attrs(field.hir_id)); |
| s.print_type(field.ty); |
| }); |
| self.pclose(); |
| } |
| self.print_where_clause(generics); |
| if print_finalizer { |
| self.word(";"); |
| } |
| self.end(ib); |
| self.end(cb); |
| } |
| hir::VariantData::Struct { .. } => { |
| self.print_where_clause(generics); |
| self.nbsp(); |
| self.bopen(ib); |
| self.hardbreak_if_not_bol(); |
| |
| for field in struct_def.fields() { |
| self.hardbreak_if_not_bol(); |
| self.maybe_print_comment(field.span.lo()); |
| self.print_attrs(self.attrs(field.hir_id)); |
| self.print_ident(field.ident); |
| self.word_nbsp(":"); |
| self.print_type(field.ty); |
| self.word(","); |
| } |
| |
| self.bclose(span, cb) |
| } |
| } |
| } |
| |
| pub fn print_variant(&mut self, v: &hir::Variant<'_>) { |
| let (cb, ib) = self.head(""); |
| let generics = hir::Generics::empty(); |
| self.print_struct(v.ident.name, generics, &v.data, v.span, false, cb, ib); |
| if let Some(ref d) = v.disr_expr { |
| self.space(); |
| self.word_space("="); |
| self.print_anon_const(d); |
| } |
| } |
| |
| fn print_method_sig( |
| &mut self, |
| ident: Ident, |
| m: &hir::FnSig<'_>, |
| generics: &hir::Generics<'_>, |
| arg_idents: &[Option<Ident>], |
| body_id: Option<hir::BodyId>, |
| ) { |
| self.print_fn(m.header, Some(ident.name), generics, m.decl, arg_idents, body_id); |
| } |
| |
| fn print_trait_item(&mut self, ti: &hir::TraitItem<'_>) { |
| self.ann.pre(self, AnnNode::SubItem(ti.hir_id())); |
| self.hardbreak_if_not_bol(); |
| self.maybe_print_comment(ti.span.lo()); |
| self.print_attrs(self.attrs(ti.hir_id())); |
| match ti.kind { |
| hir::TraitItemKind::Const(ty, default) => { |
| self.print_associated_const(ti.ident, ti.generics, ty, default); |
| } |
| hir::TraitItemKind::Fn(ref sig, hir::TraitFn::Required(arg_idents)) => { |
| self.print_method_sig(ti.ident, sig, ti.generics, arg_idents, None); |
| self.word(";"); |
| } |
| hir::TraitItemKind::Fn(ref sig, hir::TraitFn::Provided(body)) => { |
| let (cb, ib) = self.head(""); |
| self.print_method_sig(ti.ident, sig, ti.generics, &[], Some(body)); |
| self.nbsp(); |
| self.end(ib); |
| self.end(cb); |
| self.ann.nested(self, Nested::Body(body)); |
| } |
| hir::TraitItemKind::Type(bounds, default) => { |
| self.print_associated_type(ti.ident, ti.generics, Some(bounds), default); |
| } |
| } |
| self.ann.post(self, AnnNode::SubItem(ti.hir_id())) |
| } |
| |
| fn print_impl_item(&mut self, ii: &hir::ImplItem<'_>) { |
| self.ann.pre(self, AnnNode::SubItem(ii.hir_id())); |
| self.hardbreak_if_not_bol(); |
| self.maybe_print_comment(ii.span.lo()); |
| self.print_attrs(self.attrs(ii.hir_id())); |
| |
| match ii.kind { |
| hir::ImplItemKind::Const(ty, expr) => { |
| self.print_associated_const(ii.ident, ii.generics, ty, Some(expr)); |
| } |
| hir::ImplItemKind::Fn(ref sig, body) => { |
| let (cb, ib) = self.head(""); |
| self.print_method_sig(ii.ident, sig, ii.generics, &[], Some(body)); |
| self.nbsp(); |
| self.end(ib); |
| self.end(cb); |
| self.ann.nested(self, Nested::Body(body)); |
| } |
| hir::ImplItemKind::Type(ty) => { |
| self.print_associated_type(ii.ident, ii.generics, None, Some(ty)); |
| } |
| } |
| self.ann.post(self, AnnNode::SubItem(ii.hir_id())) |
| } |
| |
| fn print_local( |
| &mut self, |
| super_: bool, |
| init: Option<&hir::Expr<'_>>, |
| els: Option<&hir::Block<'_>>, |
| decl: impl Fn(&mut Self), |
| ) { |
| self.space_if_not_bol(); |
| let ibm1 = self.ibox(INDENT_UNIT); |
| if super_ { |
| self.word_nbsp("super"); |
| } |
| self.word_nbsp("let"); |
| |
| let ibm2 = self.ibox(INDENT_UNIT); |
| decl(self); |
| self.end(ibm2); |
| |
| if let Some(init) = init { |
| self.nbsp(); |
| self.word_space("="); |
| self.print_expr(init); |
| } |
| |
| if let Some(els) = els { |
| self.nbsp(); |
| self.word_space("else"); |
| // containing cbox, will be closed by print-block at `}` |
| let cb = self.cbox(0); |
| // head-box, will be closed by print-block after `{` |
| let ib = self.ibox(0); |
| self.print_block(els, cb, ib); |
| } |
| |
| self.end(ibm1) |
| } |
| |
| fn print_stmt(&mut self, st: &hir::Stmt<'_>) { |
| self.maybe_print_comment(st.span.lo()); |
| match st.kind { |
| hir::StmtKind::Let(loc) => { |
| self.print_local(loc.super_.is_some(), loc.init, loc.els, |this| { |
| this.print_local_decl(loc) |
| }); |
| } |
| hir::StmtKind::Item(item) => self.ann.nested(self, Nested::Item(item)), |
| hir::StmtKind::Expr(expr) => { |
| self.space_if_not_bol(); |
| self.print_expr(expr); |
| } |
| hir::StmtKind::Semi(expr) => { |
| self.space_if_not_bol(); |
| self.print_expr(expr); |
| self.word(";"); |
| } |
| } |
| if stmt_ends_with_semi(&st.kind) { |
| self.word(";"); |
| } |
| self.maybe_print_trailing_comment(st.span, None) |
| } |
| |
| fn print_block(&mut self, blk: &hir::Block<'_>, cb: BoxMarker, ib: BoxMarker) { |
| self.print_block_maybe_unclosed(blk, Some(cb), ib) |
| } |
| |
| fn print_block_unclosed(&mut self, blk: &hir::Block<'_>, ib: BoxMarker) { |
| self.print_block_maybe_unclosed(blk, None, ib) |
| } |
| |
| fn print_block_maybe_unclosed( |
| &mut self, |
| blk: &hir::Block<'_>, |
| cb: Option<BoxMarker>, |
| ib: BoxMarker, |
| ) { |
| match blk.rules { |
| hir::BlockCheckMode::UnsafeBlock(..) => self.word_space("unsafe"), |
| hir::BlockCheckMode::DefaultBlock => (), |
| } |
| self.maybe_print_comment(blk.span.lo()); |
| self.ann.pre(self, AnnNode::Block(blk)); |
| self.bopen(ib); |
| |
| for st in blk.stmts { |
| self.print_stmt(st); |
| } |
| if let Some(expr) = blk.expr { |
| self.space_if_not_bol(); |
| self.print_expr(expr); |
| self.maybe_print_trailing_comment(expr.span, Some(blk.span.hi())); |
| } |
| self.bclose_maybe_open(blk.span, cb); |
| self.ann.post(self, AnnNode::Block(blk)) |
| } |
| |
| fn print_else(&mut self, els: Option<&hir::Expr<'_>>) { |
| if let Some(els_inner) = els { |
| match els_inner.kind { |
| // Another `else if` block. |
| hir::ExprKind::If(i, hir::Expr { kind: hir::ExprKind::Block(t, None), .. }, e) => { |
| let cb = self.cbox(0); |
| let ib = self.ibox(0); |
| self.word(" else if "); |
| self.print_expr_as_cond(i); |
| self.space(); |
| self.print_block(t, cb, ib); |
| self.print_else(e); |
| } |
| // Final `else` block. |
| hir::ExprKind::Block(b, None) => { |
| let cb = self.cbox(0); |
| let ib = self.ibox(0); |
| self.word(" else "); |
| self.print_block(b, cb, ib); |
| } |
| // Constraints would be great here! |
| _ => { |
| panic!("print_if saw if with weird alternative"); |
| } |
| } |
| } |
| } |
| |
| fn print_if( |
| &mut self, |
| test: &hir::Expr<'_>, |
| blk: &hir::Expr<'_>, |
| elseopt: Option<&hir::Expr<'_>>, |
| ) { |
| match blk.kind { |
| hir::ExprKind::Block(blk, None) => { |
| let cb = self.cbox(0); |
| let ib = self.ibox(0); |
| self.word_nbsp("if"); |
| self.print_expr_as_cond(test); |
| self.space(); |
| self.print_block(blk, cb, ib); |
| self.print_else(elseopt) |
| } |
| _ => panic!("non-block then expr"), |
| } |
| } |
| |
| fn print_anon_const(&mut self, constant: &hir::AnonConst) { |
| self.ann.nested(self, Nested::Body(constant.body)) |
| } |
| |
| fn print_const_arg(&mut self, const_arg: &hir::ConstArg<'_>) { |
| match &const_arg.kind { |
| ConstArgKind::Path(qpath) => self.print_qpath(qpath, true), |
| ConstArgKind::Anon(anon) => self.print_anon_const(anon), |
| ConstArgKind::Infer(..) => self.word("_"), |
| } |
| } |
| |
| fn print_call_post(&mut self, args: &[hir::Expr<'_>]) { |
| self.popen(); |
| self.commasep_exprs(Inconsistent, args); |
| self.pclose() |
| } |
| |
| /// Prints an expr using syntax that's acceptable in a condition position, such as the `cond` in |
| /// `if cond { ... }`. |
| fn print_expr_as_cond(&mut self, expr: &hir::Expr<'_>) { |
| self.print_expr_cond_paren(expr, Self::cond_needs_par(expr)) |
| } |
| |
| /// Prints `expr` or `(expr)` when `needs_par` holds. |
| fn print_expr_cond_paren(&mut self, expr: &hir::Expr<'_>, needs_par: bool) { |
| if needs_par { |
| self.popen(); |
| } |
| if let hir::ExprKind::DropTemps(actual_expr) = expr.kind { |
| self.print_expr(actual_expr); |
| } else { |
| self.print_expr(expr); |
| } |
| if needs_par { |
| self.pclose(); |
| } |
| } |
| |
| /// Print a `let pat = expr` expression. |
| fn print_let(&mut self, pat: &hir::Pat<'_>, ty: Option<&hir::Ty<'_>>, init: &hir::Expr<'_>) { |
| self.word_space("let"); |
| self.print_pat(pat); |
| if let Some(ty) = ty { |
| self.word_space(":"); |
| self.print_type(ty); |
| } |
| self.space(); |
| self.word_space("="); |
| let npals = || parser::needs_par_as_let_scrutinee(self.precedence(init)); |
| self.print_expr_cond_paren(init, Self::cond_needs_par(init) || npals()) |
| } |
| |
| // Does `expr` need parentheses when printed in a condition position? |
| // |
| // These cases need parens due to the parse error observed in #26461: `if return {}` |
| // parses as the erroneous construct `if (return {})`, not `if (return) {}`. |
| fn cond_needs_par(expr: &hir::Expr<'_>) -> bool { |
| match expr.kind { |
| hir::ExprKind::Break(..) | hir::ExprKind::Closure { .. } | hir::ExprKind::Ret(..) => { |
| true |
| } |
| _ => contains_exterior_struct_lit(expr), |
| } |
| } |
| |
| fn print_expr_vec(&mut self, exprs: &[hir::Expr<'_>]) { |
| let ib = self.ibox(INDENT_UNIT); |
| self.word("["); |
| self.commasep_exprs(Inconsistent, exprs); |
| self.word("]"); |
| self.end(ib) |
| } |
| |
| fn print_inline_const(&mut self, constant: &hir::ConstBlock) { |
| let ib = self.ibox(INDENT_UNIT); |
| self.word_space("const"); |
| self.ann.nested(self, Nested::Body(constant.body)); |
| self.end(ib) |
| } |
| |
| fn print_expr_repeat(&mut self, element: &hir::Expr<'_>, count: &hir::ConstArg<'_>) { |
| let ib = self.ibox(INDENT_UNIT); |
| self.word("["); |
| self.print_expr(element); |
| self.word_space(";"); |
| self.print_const_arg(count); |
| self.word("]"); |
| self.end(ib) |
| } |
| |
| fn print_expr_struct( |
| &mut self, |
| qpath: &hir::QPath<'_>, |
| fields: &[hir::ExprField<'_>], |
| wth: hir::StructTailExpr<'_>, |
| ) { |
| self.print_qpath(qpath, true); |
| self.nbsp(); |
| self.word_space("{"); |
| self.commasep_cmnt(Consistent, fields, |s, field| s.print_expr_field(field), |f| f.span); |
| match wth { |
| hir::StructTailExpr::Base(expr) => { |
| let ib = self.ibox(INDENT_UNIT); |
| if !fields.is_empty() { |
| self.word(","); |
| self.space(); |
| } |
| self.word(".."); |
| self.print_expr(expr); |
| self.end(ib); |
| } |
| hir::StructTailExpr::DefaultFields(_) => { |
| let ib = self.ibox(INDENT_UNIT); |
| if !fields.is_empty() { |
| self.word(","); |
| self.space(); |
| } |
| self.word(".."); |
| self.end(ib); |
| } |
| hir::StructTailExpr::None => {} |
| } |
| self.space(); |
| self.word("}"); |
| } |
| |
| fn print_expr_field(&mut self, field: &hir::ExprField<'_>) { |
| let cb = self.cbox(INDENT_UNIT); |
| self.print_attrs(self.attrs(field.hir_id)); |
| if !field.is_shorthand { |
| self.print_ident(field.ident); |
| self.word_space(":"); |
| } |
| self.print_expr(field.expr); |
| self.end(cb) |
| } |
| |
| fn print_expr_tup(&mut self, exprs: &[hir::Expr<'_>]) { |
| self.popen(); |
| self.commasep_exprs(Inconsistent, exprs); |
| if exprs.len() == 1 { |
| self.word(","); |
| } |
| self.pclose() |
| } |
| |
| fn print_expr_call(&mut self, func: &hir::Expr<'_>, args: &[hir::Expr<'_>]) { |
| let needs_paren = match func.kind { |
| hir::ExprKind::Field(..) => true, |
| _ => self.precedence(func) < ExprPrecedence::Unambiguous, |
| }; |
| |
| self.print_expr_cond_paren(func, needs_paren); |
| self.print_call_post(args) |
| } |
| |
| fn print_expr_method_call( |
| &mut self, |
| segment: &hir::PathSegment<'_>, |
| receiver: &hir::Expr<'_>, |
| args: &[hir::Expr<'_>], |
| ) { |
| let base_args = args; |
| self.print_expr_cond_paren( |
| receiver, |
| self.precedence(receiver) < ExprPrecedence::Unambiguous, |
| ); |
| self.word("."); |
| self.print_ident(segment.ident); |
| |
| let generic_args = segment.args(); |
| if !generic_args.args.is_empty() || !generic_args.constraints.is_empty() { |
| self.print_generic_args(generic_args, true); |
| } |
| |
| self.print_call_post(base_args) |
| } |
| |
| fn print_expr_binary(&mut self, op: hir::BinOpKind, lhs: &hir::Expr<'_>, rhs: &hir::Expr<'_>) { |
| let binop_prec = op.precedence(); |
| let left_prec = self.precedence(lhs); |
| let right_prec = self.precedence(rhs); |
| |
| let (mut left_needs_paren, right_needs_paren) = match op.fixity() { |
| Fixity::Left => (left_prec < binop_prec, right_prec <= binop_prec), |
| Fixity::Right => (left_prec <= binop_prec, right_prec < binop_prec), |
| Fixity::None => (left_prec <= binop_prec, right_prec <= binop_prec), |
| }; |
| |
| match (&lhs.kind, op) { |
| // These cases need parens: `x as i32 < y` has the parser thinking that `i32 < y` is |
| // the beginning of a path type. It starts trying to parse `x as (i32 < y ...` instead |
| // of `(x as i32) < ...`. We need to convince it _not_ to do that. |
| (&hir::ExprKind::Cast { .. }, hir::BinOpKind::Lt | hir::BinOpKind::Shl) => { |
| left_needs_paren = true; |
| } |
| (&hir::ExprKind::Let { .. }, _) if !parser::needs_par_as_let_scrutinee(binop_prec) => { |
| left_needs_paren = true; |
| } |
| _ => {} |
| } |
| |
| self.print_expr_cond_paren(lhs, left_needs_paren); |
| self.space(); |
| self.word_space(op.as_str()); |
| self.print_expr_cond_paren(rhs, right_needs_paren); |
| } |
| |
| fn print_expr_unary(&mut self, op: hir::UnOp, expr: &hir::Expr<'_>) { |
| self.word(op.as_str()); |
| self.print_expr_cond_paren(expr, self.precedence(expr) < ExprPrecedence::Prefix); |
| } |
| |
| fn print_expr_addr_of( |
| &mut self, |
| kind: hir::BorrowKind, |
| mutability: hir::Mutability, |
| expr: &hir::Expr<'_>, |
| ) { |
| self.word("&"); |
| match kind { |
| hir::BorrowKind::Ref => self.print_mutability(mutability, false), |
| hir::BorrowKind::Raw => { |
| self.word_nbsp("raw"); |
| self.print_mutability(mutability, true); |
| } |
| hir::BorrowKind::Pin => { |
| self.word_nbsp("pin"); |
| self.print_mutability(mutability, true); |
| } |
| } |
| self.print_expr_cond_paren(expr, self.precedence(expr) < ExprPrecedence::Prefix); |
| } |
| |
| fn print_literal(&mut self, lit: &hir::Lit) { |
| self.maybe_print_comment(lit.span.lo()); |
| self.word(lit.node.to_string()) |
| } |
| |
| fn print_inline_asm(&mut self, asm: &hir::InlineAsm<'_>) { |
| enum AsmArg<'a> { |
| Template(String), |
| Operand(&'a hir::InlineAsmOperand<'a>), |
| Options(ast::InlineAsmOptions), |
| } |
| |
| let mut args = vec![AsmArg::Template(ast::InlineAsmTemplatePiece::to_string(asm.template))]; |
| args.extend(asm.operands.iter().map(|(o, _)| AsmArg::Operand(o))); |
| if !asm.options.is_empty() { |
| args.push(AsmArg::Options(asm.options)); |
| } |
| |
| self.popen(); |
| self.commasep(Consistent, &args, |s, arg| match *arg { |
| AsmArg::Template(ref template) => s.print_string(template, ast::StrStyle::Cooked), |
| AsmArg::Operand(op) => match *op { |
| hir::InlineAsmOperand::In { reg, expr } => { |
| s.word("in"); |
| s.popen(); |
| s.word(format!("{reg}")); |
| s.pclose(); |
| s.space(); |
| s.print_expr(expr); |
| } |
| hir::InlineAsmOperand::Out { reg, late, ref expr } => { |
| s.word(if late { "lateout" } else { "out" }); |
| s.popen(); |
| s.word(format!("{reg}")); |
| s.pclose(); |
| s.space(); |
| match expr { |
| Some(expr) => s.print_expr(expr), |
| None => s.word("_"), |
| } |
| } |
| hir::InlineAsmOperand::InOut { reg, late, expr } => { |
| s.word(if late { "inlateout" } else { "inout" }); |
| s.popen(); |
| s.word(format!("{reg}")); |
| s.pclose(); |
| s.space(); |
| s.print_expr(expr); |
| } |
| hir::InlineAsmOperand::SplitInOut { reg, late, in_expr, ref out_expr } => { |
| s.word(if late { "inlateout" } else { "inout" }); |
| s.popen(); |
| s.word(format!("{reg}")); |
| s.pclose(); |
| s.space(); |
| s.print_expr(in_expr); |
| s.space(); |
| s.word_space("=>"); |
| match out_expr { |
| Some(out_expr) => s.print_expr(out_expr), |
| None => s.word("_"), |
| } |
| } |
| hir::InlineAsmOperand::Const { ref anon_const } => { |
| s.word("const"); |
| s.space(); |
| // Not using `print_inline_const` to avoid additional `const { ... }` |
| s.ann.nested(s, Nested::Body(anon_const.body)) |
| } |
| hir::InlineAsmOperand::SymFn { ref expr } => { |
| s.word("sym_fn"); |
| s.space(); |
| s.print_expr(expr); |
| } |
| hir::InlineAsmOperand::SymStatic { ref path, def_id: _ } => { |
| s.word("sym_static"); |
| s.space(); |
| s.print_qpath(path, true); |
| } |
| hir::InlineAsmOperand::Label { block } => { |
| let (cb, ib) = s.head("label"); |
| s.print_block(block, cb, ib); |
| } |
| }, |
| AsmArg::Options(opts) => { |
| s.word("options"); |
| s.popen(); |
| s.commasep(Inconsistent, &opts.human_readable_names(), |s, &opt| { |
| s.word(opt); |
| }); |
| s.pclose(); |
| } |
| }); |
| self.pclose(); |
| } |
| |
| fn print_expr(&mut self, expr: &hir::Expr<'_>) { |
| self.maybe_print_comment(expr.span.lo()); |
| self.print_attrs(self.attrs(expr.hir_id)); |
| let ib = self.ibox(INDENT_UNIT); |
| self.ann.pre(self, AnnNode::Expr(expr)); |
| match expr.kind { |
| hir::ExprKind::Array(exprs) => { |
| self.print_expr_vec(exprs); |
| } |
| hir::ExprKind::ConstBlock(ref anon_const) => { |
| self.print_inline_const(anon_const); |
| } |
| hir::ExprKind::Repeat(element, ref count) => { |
| self.print_expr_repeat(element, count); |
| } |
| hir::ExprKind::Struct(qpath, fields, wth) => { |
| self.print_expr_struct(qpath, fields, wth); |
| } |
| hir::ExprKind::Tup(exprs) => { |
| self.print_expr_tup(exprs); |
| } |
| hir::ExprKind::Call(func, args) => { |
| self.print_expr_call(func, args); |
| } |
| hir::ExprKind::MethodCall(segment, receiver, args, _) => { |
| self.print_expr_method_call(segment, receiver, args); |
| } |
| hir::ExprKind::Use(expr, _) => { |
| self.print_expr(expr); |
| self.word(".use"); |
| } |
| hir::ExprKind::Binary(op, lhs, rhs) => { |
| self.print_expr_binary(op.node, lhs, rhs); |
| } |
| hir::ExprKind::Unary(op, expr) => { |
| self.print_expr_unary(op, expr); |
| } |
| hir::ExprKind::AddrOf(k, m, expr) => { |
| self.print_expr_addr_of(k, m, expr); |
| } |
| hir::ExprKind::Lit(lit) => { |
| self.print_literal(&lit); |
| } |
| hir::ExprKind::Cast(expr, ty) => { |
| self.print_expr_cond_paren(expr, self.precedence(expr) < ExprPrecedence::Cast); |
| self.space(); |
| self.word_space("as"); |
| self.print_type(ty); |
| } |
| hir::ExprKind::Type(expr, ty) => { |
| self.word("type_ascribe!("); |
| let ib = self.ibox(0); |
| self.print_expr(expr); |
| |
| self.word(","); |
| self.space_if_not_bol(); |
| self.print_type(ty); |
| |
| self.end(ib); |
| self.word(")"); |
| } |
| hir::ExprKind::DropTemps(init) => { |
| // Print `{`: |
| let cb = self.cbox(0); |
| let ib = self.ibox(0); |
| self.bopen(ib); |
| |
| // Print `let _t = $init;`: |
| let temp = Ident::with_dummy_span(sym::_t); |
| self.print_local(false, Some(init), None, |this| this.print_ident(temp)); |
| self.word(";"); |
| |
| // Print `_t`: |
| self.space_if_not_bol(); |
| self.print_ident(temp); |
| |
| // Print `}`: |
| self.bclose_maybe_open(expr.span, Some(cb)); |
| } |
| hir::ExprKind::Let(&hir::LetExpr { pat, ty, init, .. }) => { |
| self.print_let(pat, ty, init); |
| } |
| hir::ExprKind::If(test, blk, elseopt) => { |
| self.print_if(test, blk, elseopt); |
| } |
| hir::ExprKind::Loop(blk, opt_label, _, _) => { |
| let cb = self.cbox(0); |
| let ib = self.ibox(0); |
| if let Some(label) = opt_label { |
| self.print_ident(label.ident); |
| self.word_space(":"); |
| } |
| self.word_nbsp("loop"); |
| self.print_block(blk, cb, ib); |
| } |
| hir::ExprKind::Match(expr, arms, _) => { |
| let cb = self.cbox(0); |
| let ib = self.ibox(0); |
| self.word_nbsp("match"); |
| self.print_expr_as_cond(expr); |
| self.space(); |
| self.bopen(ib); |
| for arm in arms { |
| self.print_arm(arm); |
| } |
| self.bclose(expr.span, cb); |
| } |
| hir::ExprKind::Closure(&hir::Closure { |
| binder, |
| constness, |
| capture_clause, |
| bound_generic_params, |
| fn_decl, |
| body, |
| fn_decl_span: _, |
| fn_arg_span: _, |
| kind: _, |
| def_id: _, |
| }) => { |
| self.print_closure_binder(binder, bound_generic_params); |
| self.print_constness(constness); |
| self.print_capture_clause(capture_clause); |
| |
| self.print_closure_params(fn_decl, body); |
| self.space(); |
| |
| // This is a bare expression. |
| self.ann.nested(self, Nested::Body(body)); |
| } |
| hir::ExprKind::Block(blk, opt_label) => { |
| if let Some(label) = opt_label { |
| self.print_ident(label.ident); |
| self.word_space(":"); |
| } |
| // containing cbox, will be closed by print-block at `}` |
| let cb = self.cbox(0); |
| // head-box, will be closed by print-block after `{` |
| let ib = self.ibox(0); |
| self.print_block(blk, cb, ib); |
| } |
| hir::ExprKind::Assign(lhs, rhs, _) => { |
| self.print_expr_cond_paren(lhs, self.precedence(lhs) <= ExprPrecedence::Assign); |
| self.space(); |
| self.word_space("="); |
| self.print_expr_cond_paren(rhs, self.precedence(rhs) < ExprPrecedence::Assign); |
| } |
| hir::ExprKind::AssignOp(op, lhs, rhs) => { |
| self.print_expr_cond_paren(lhs, self.precedence(lhs) <= ExprPrecedence::Assign); |
| self.space(); |
| self.word_space(op.node.as_str()); |
| self.print_expr_cond_paren(rhs, self.precedence(rhs) < ExprPrecedence::Assign); |
| } |
| hir::ExprKind::Field(expr, ident) => { |
| self.print_expr_cond_paren( |
| expr, |
| self.precedence(expr) < ExprPrecedence::Unambiguous, |
| ); |
| self.word("."); |
| self.print_ident(ident); |
| } |
| hir::ExprKind::Index(expr, index, _) => { |
| self.print_expr_cond_paren( |
| expr, |
| self.precedence(expr) < ExprPrecedence::Unambiguous, |
| ); |
| self.word("["); |
| self.print_expr(index); |
| self.word("]"); |
| } |
| hir::ExprKind::Path(ref qpath) => self.print_qpath(qpath, true), |
| hir::ExprKind::Break(destination, opt_expr) => { |
| self.word("break"); |
| if let Some(label) = destination.label { |
| self.space(); |
| self.print_ident(label.ident); |
| } |
| if let Some(expr) = opt_expr { |
| self.space(); |
| self.print_expr_cond_paren(expr, self.precedence(expr) < ExprPrecedence::Jump); |
| } |
| } |
| hir::ExprKind::Continue(destination) => { |
| self.word("continue"); |
| if let Some(label) = destination.label { |
| self.space(); |
| self.print_ident(label.ident); |
| } |
| } |
| hir::ExprKind::Ret(result) => { |
| self.word("return"); |
| if let Some(expr) = result { |
| self.word(" "); |
| self.print_expr_cond_paren(expr, self.precedence(expr) < ExprPrecedence::Jump); |
| } |
| } |
| hir::ExprKind::Become(result) => { |
| self.word("become"); |
| self.word(" "); |
| self.print_expr_cond_paren(result, self.precedence(result) < ExprPrecedence::Jump); |
| } |
| hir::ExprKind::InlineAsm(asm) => { |
| self.word("asm!"); |
| self.print_inline_asm(asm); |
| } |
| hir::ExprKind::OffsetOf(container, fields) => { |
| self.word("offset_of!("); |
| self.print_type(container); |
| self.word(","); |
| self.space(); |
| |
| if let Some((&first, rest)) = fields.split_first() { |
| self.print_ident(first); |
| |
| for &field in rest { |
| self.word("."); |
| self.print_ident(field); |
| } |
| } |
| |
| self.word(")"); |
| } |
| hir::ExprKind::UnsafeBinderCast(kind, expr, ty) => { |
| match kind { |
| ast::UnsafeBinderCastKind::Wrap => self.word("wrap_binder!("), |
| ast::UnsafeBinderCastKind::Unwrap => self.word("unwrap_binder!("), |
| } |
| self.print_expr(expr); |
| if let Some(ty) = ty { |
| self.word(","); |
| self.space(); |
| self.print_type(ty); |
| } |
| self.word(")"); |
| } |
| hir::ExprKind::Yield(expr, _) => { |
| self.word_space("yield"); |
| self.print_expr_cond_paren(expr, self.precedence(expr) < ExprPrecedence::Jump); |
| } |
| hir::ExprKind::Err(_) => { |
| self.popen(); |
| self.word("/*ERROR*/"); |
| self.pclose(); |
| } |
| } |
| self.ann.post(self, AnnNode::Expr(expr)); |
| self.end(ib) |
| } |
| |
| fn print_local_decl(&mut self, loc: &hir::LetStmt<'_>) { |
| self.print_pat(loc.pat); |
| if let Some(ty) = loc.ty { |
| self.word_space(":"); |
| self.print_type(ty); |
| } |
| } |
| |
| fn print_name(&mut self, name: Symbol) { |
| self.print_ident(Ident::with_dummy_span(name)) |
| } |
| |
| fn print_path<R>(&mut self, path: &hir::Path<'_, R>, colons_before_params: bool) { |
| self.maybe_print_comment(path.span.lo()); |
| |
| for (i, segment) in path.segments.iter().enumerate() { |
| if i > 0 { |
| self.word("::") |
| } |
| if segment.ident.name != kw::PathRoot { |
| self.print_ident(segment.ident); |
| self.print_generic_args(segment.args(), colons_before_params); |
| } |
| } |
| } |
| |
| fn print_path_segment(&mut self, segment: &hir::PathSegment<'_>) { |
| if segment.ident.name != kw::PathRoot { |
| self.print_ident(segment.ident); |
| self.print_generic_args(segment.args(), false); |
| } |
| } |
| |
| fn print_qpath(&mut self, qpath: &hir::QPath<'_>, colons_before_params: bool) { |
| match *qpath { |
| hir::QPath::Resolved(None, path) => self.print_path(path, colons_before_params), |
| hir::QPath::Resolved(Some(qself), path) => { |
| self.word("<"); |
| self.print_type(qself); |
| self.space(); |
| self.word_space("as"); |
| |
| for (i, segment) in path.segments[..path.segments.len() - 1].iter().enumerate() { |
| if i > 0 { |
| self.word("::") |
| } |
| if segment.ident.name != kw::PathRoot { |
| self.print_ident(segment.ident); |
| self.print_generic_args(segment.args(), colons_before_params); |
| } |
| } |
| |
| self.word(">"); |
| self.word("::"); |
| let item_segment = path.segments.last().unwrap(); |
| self.print_ident(item_segment.ident); |
| self.print_generic_args(item_segment.args(), colons_before_params) |
| } |
| hir::QPath::TypeRelative(qself, item_segment) => { |
| // If we've got a compound-qualified-path, let's push an additional pair of angle |
| // brackets, so that we pretty-print `<<A::B>::C>` as `<A::B>::C`, instead of just |
| // `A::B::C` (since the latter could be ambiguous to the user) |
| if let hir::TyKind::Path(hir::QPath::Resolved(None, _)) = qself.kind { |
| self.print_type(qself); |
| } else { |
| self.word("<"); |
| self.print_type(qself); |
| self.word(">"); |
| } |
| |
| self.word("::"); |
| self.print_ident(item_segment.ident); |
| self.print_generic_args(item_segment.args(), colons_before_params) |
| } |
| hir::QPath::LangItem(lang_item, span) => { |
| self.word("#[lang = \""); |
| self.print_ident(Ident::new(lang_item.name(), span)); |
| self.word("\"]"); |
| } |
| } |
| } |
| |
| fn print_generic_args( |
| &mut self, |
| generic_args: &hir::GenericArgs<'_>, |
| colons_before_params: bool, |
| ) { |
| match generic_args.parenthesized { |
| hir::GenericArgsParentheses::No => { |
| let start = if colons_before_params { "::<" } else { "<" }; |
| let empty = Cell::new(true); |
| let start_or_comma = |this: &mut Self| { |
| if empty.get() { |
| empty.set(false); |
| this.word(start) |
| } else { |
| this.word_space(",") |
| } |
| }; |
| |
| let mut nonelided_generic_args: bool = false; |
| let elide_lifetimes = generic_args.args.iter().all(|arg| match arg { |
| GenericArg::Lifetime(lt) if lt.is_elided() => true, |
| GenericArg::Lifetime(_) => { |
| nonelided_generic_args = true; |
| false |
| } |
| _ => { |
| nonelided_generic_args = true; |
| true |
| } |
| }); |
| |
| if nonelided_generic_args { |
| start_or_comma(self); |
| self.commasep(Inconsistent, generic_args.args, |s, generic_arg| { |
| s.print_generic_arg(generic_arg, elide_lifetimes) |
| }); |
| } |
| |
| for constraint in generic_args.constraints { |
| start_or_comma(self); |
| self.print_assoc_item_constraint(constraint); |
| } |
| |
| if !empty.get() { |
| self.word(">") |
| } |
| } |
| hir::GenericArgsParentheses::ParenSugar => { |
| let (inputs, output) = generic_args.paren_sugar_inputs_output().unwrap(); |
| |
| self.word("("); |
| self.commasep(Inconsistent, inputs, |s, ty| s.print_type(ty)); |
| self.word(")"); |
| |
| self.space_if_not_bol(); |
| self.word_space("->"); |
| self.print_type(output); |
| } |
| hir::GenericArgsParentheses::ReturnTypeNotation => { |
| self.word("(..)"); |
| } |
| } |
| } |
| |
| fn print_assoc_item_constraint(&mut self, constraint: &hir::AssocItemConstraint<'_>) { |
| self.print_ident(constraint.ident); |
| self.print_generic_args(constraint.gen_args, false); |
| self.space(); |
| match constraint.kind { |
| hir::AssocItemConstraintKind::Equality { ref term } => { |
| self.word_space("="); |
| match term { |
| Term::Ty(ty) => self.print_type(ty), |
| Term::Const(c) => self.print_const_arg(c), |
| } |
| } |
| hir::AssocItemConstraintKind::Bound { bounds } => { |
| self.print_bounds(":", bounds); |
| } |
| } |
| } |
| |
| fn print_pat_expr(&mut self, expr: &hir::PatExpr<'_>) { |
| match &expr.kind { |
| hir::PatExprKind::Lit { lit, negated } => { |
| if *negated { |
| self.word("-"); |
| } |
| self.print_literal(lit); |
| } |
| hir::PatExprKind::ConstBlock(c) => self.print_inline_const(c), |
| hir::PatExprKind::Path(qpath) => self.print_qpath(qpath, true), |
| } |
| } |
| |
| fn print_ty_pat(&mut self, pat: &hir::TyPat<'_>) { |
| self.maybe_print_comment(pat.span.lo()); |
| self.ann.pre(self, AnnNode::TyPat(pat)); |
| // Pat isn't normalized, but the beauty of it |
| // is that it doesn't matter |
| match pat.kind { |
| TyPatKind::Range(begin, end) => { |
| self.print_const_arg(begin); |
| self.word("..="); |
| self.print_const_arg(end); |
| } |
| TyPatKind::Or(patterns) => { |
| self.popen(); |
| let mut first = true; |
| for pat in patterns { |
| if first { |
| first = false; |
| } else { |
| self.word(" | "); |
| } |
| self.print_ty_pat(pat); |
| } |
| self.pclose(); |
| } |
| TyPatKind::Err(_) => { |
| self.popen(); |
| self.word("/*ERROR*/"); |
| self.pclose(); |
| } |
| } |
| self.ann.post(self, AnnNode::TyPat(pat)) |
| } |
| |
| fn print_pat(&mut self, pat: &hir::Pat<'_>) { |
| self.maybe_print_comment(pat.span.lo()); |
| self.ann.pre(self, AnnNode::Pat(pat)); |
| // Pat isn't normalized, but the beauty of it is that it doesn't matter. |
| match pat.kind { |
| // Printing `_` isn't ideal for a missing pattern, but it's easy and good enough. |
| // E.g. `fn(u32)` gets printed as `fn(_: u32)`. |
| PatKind::Missing => self.word("_"), |
| PatKind::Wild => self.word("_"), |
| PatKind::Never => self.word("!"), |
| PatKind::Binding(BindingMode(by_ref, mutbl), _, ident, sub) => { |
| if mutbl.is_mut() { |
| self.word_nbsp("mut"); |
| } |
| if let ByRef::Yes(rmutbl) = by_ref { |
| self.word_nbsp("ref"); |
| if rmutbl.is_mut() { |
| self.word_nbsp("mut"); |
| } |
| } |
| self.print_ident(ident); |
| if let Some(p) = sub { |
| self.word("@"); |
| self.print_pat(p); |
| } |
| } |
| PatKind::TupleStruct(ref qpath, elts, ddpos) => { |
| self.print_qpath(qpath, true); |
| self.popen(); |
| if let Some(ddpos) = ddpos.as_opt_usize() { |
| self.commasep(Inconsistent, &elts[..ddpos], |s, p| s.print_pat(p)); |
| if ddpos != 0 { |
| self.word_space(","); |
| } |
| self.word(".."); |
| if ddpos != elts.len() { |
| self.word(","); |
| self.commasep(Inconsistent, &elts[ddpos..], |s, p| s.print_pat(p)); |
| } |
| } else { |
| self.commasep(Inconsistent, elts, |s, p| s.print_pat(p)); |
| } |
| self.pclose(); |
| } |
| PatKind::Struct(ref qpath, fields, etc) => { |
| self.print_qpath(qpath, true); |
| self.nbsp(); |
| self.word("{"); |
| let empty = fields.is_empty() && etc.is_none(); |
| if !empty { |
| self.space(); |
| } |
| self.commasep_cmnt(Consistent, fields, |s, f| s.print_patfield(f), |f| f.pat.span); |
| if etc.is_some() { |
| if !fields.is_empty() { |
| self.word_space(","); |
| } |
| self.word(".."); |
| } |
| if !empty { |
| self.space(); |
| } |
| self.word("}"); |
| } |
| PatKind::Or(pats) => { |
| self.strsep("|", true, Inconsistent, pats, |s, p| s.print_pat(p)); |
| } |
| PatKind::Tuple(elts, ddpos) => { |
| self.popen(); |
| if let Some(ddpos) = ddpos.as_opt_usize() { |
| self.commasep(Inconsistent, &elts[..ddpos], |s, p| s.print_pat(p)); |
| if ddpos != 0 { |
| self.word_space(","); |
| } |
| self.word(".."); |
| if ddpos != elts.len() { |
| self.word(","); |
| self.commasep(Inconsistent, &elts[ddpos..], |s, p| s.print_pat(p)); |
| } |
| } else { |
| self.commasep(Inconsistent, elts, |s, p| s.print_pat(p)); |
| if elts.len() == 1 { |
| self.word(","); |
| } |
| } |
| self.pclose(); |
| } |
| PatKind::Box(inner) => { |
| let is_range_inner = matches!(inner.kind, PatKind::Range(..)); |
| self.word("box "); |
| if is_range_inner { |
| self.popen(); |
| } |
| self.print_pat(inner); |
| if is_range_inner { |
| self.pclose(); |
| } |
| } |
| PatKind::Deref(inner) => { |
| self.word("deref!"); |
| self.popen(); |
| self.print_pat(inner); |
| self.pclose(); |
| } |
| PatKind::Ref(inner, mutbl) => { |
| let is_range_inner = matches!(inner.kind, PatKind::Range(..)); |
| self.word("&"); |
| self.word(mutbl.prefix_str()); |
| if is_range_inner { |
| self.popen(); |
| } |
| self.print_pat(inner); |
| if is_range_inner { |
| self.pclose(); |
| } |
| } |
| PatKind::Expr(e) => self.print_pat_expr(e), |
| PatKind::Range(begin, end, end_kind) => { |
| if let Some(expr) = begin { |
| self.print_pat_expr(expr); |
| } |
| match end_kind { |
| RangeEnd::Included => self.word("..."), |
| RangeEnd::Excluded => self.word(".."), |
| } |
| if let Some(expr) = end { |
| self.print_pat_expr(expr); |
| } |
| } |
| PatKind::Slice(before, slice, after) => { |
| self.word("["); |
| self.commasep(Inconsistent, before, |s, p| s.print_pat(p)); |
| if let Some(p) = slice { |
| if !before.is_empty() { |
| self.word_space(","); |
| } |
| if let PatKind::Wild = p.kind { |
| // Print nothing. |
| } else { |
| self.print_pat(p); |
| } |
| self.word(".."); |
| if !after.is_empty() { |
| self.word_space(","); |
| } |
| } |
| self.commasep(Inconsistent, after, |s, p| s.print_pat(p)); |
| self.word("]"); |
| } |
| PatKind::Guard(inner, cond) => { |
| self.print_pat(inner); |
| self.space(); |
| self.word_space("if"); |
| self.print_expr(cond); |
| } |
| PatKind::Err(_) => { |
| self.popen(); |
| self.word("/*ERROR*/"); |
| self.pclose(); |
| } |
| } |
| self.ann.post(self, AnnNode::Pat(pat)) |
| } |
| |
| fn print_patfield(&mut self, field: &hir::PatField<'_>) { |
| if self.attrs(field.hir_id).is_empty() { |
| self.space(); |
| } |
| let cb = self.cbox(INDENT_UNIT); |
| self.print_attrs(self.attrs(field.hir_id)); |
| if !field.is_shorthand { |
| self.print_ident(field.ident); |
| self.word_nbsp(":"); |
| } |
| self.print_pat(field.pat); |
| self.end(cb); |
| } |
| |
| fn print_param(&mut self, arg: &hir::Param<'_>) { |
| self.print_attrs(self.attrs(arg.hir_id)); |
| self.print_pat(arg.pat); |
| } |
| |
| fn print_implicit_self(&mut self, implicit_self_kind: &hir::ImplicitSelfKind) { |
| match implicit_self_kind { |
| ImplicitSelfKind::Imm => { |
| self.word("self"); |
| } |
| ImplicitSelfKind::Mut => { |
| self.print_mutability(hir::Mutability::Mut, false); |
| self.word("self"); |
| } |
| ImplicitSelfKind::RefImm => { |
| self.word("&"); |
| self.word("self"); |
| } |
| ImplicitSelfKind::RefMut => { |
| self.word("&"); |
| self.print_mutability(hir::Mutability::Mut, false); |
| self.word("self"); |
| } |
| ImplicitSelfKind::None => unreachable!(), |
| } |
| } |
| |
| fn print_arm(&mut self, arm: &hir::Arm<'_>) { |
| // I have no idea why this check is necessary, but here it |
| // is :( |
| if self.attrs(arm.hir_id).is_empty() { |
| self.space(); |
| } |
| let cb = self.cbox(INDENT_UNIT); |
| self.ann.pre(self, AnnNode::Arm(arm)); |
| let ib = self.ibox(0); |
| self.print_attrs(self.attrs(arm.hir_id)); |
| self.print_pat(arm.pat); |
| self.space(); |
| if let Some(ref g) = arm.guard { |
| self.word_space("if"); |
| self.print_expr(g); |
| self.space(); |
| } |
| self.word_space("=>"); |
| |
| match arm.body.kind { |
| hir::ExprKind::Block(blk, opt_label) => { |
| if let Some(label) = opt_label { |
| self.print_ident(label.ident); |
| self.word_space(":"); |
| } |
| self.print_block_unclosed(blk, ib); |
| |
| // If it is a user-provided unsafe block, print a comma after it |
| if let hir::BlockCheckMode::UnsafeBlock(hir::UnsafeSource::UserProvided) = blk.rules |
| { |
| self.word(","); |
| } |
| } |
| _ => { |
| self.end(ib); |
| self.print_expr(arm.body); |
| self.word(","); |
| } |
| } |
| self.ann.post(self, AnnNode::Arm(arm)); |
| self.end(cb) |
| } |
| |
| fn print_fn( |
| &mut self, |
| header: hir::FnHeader, |
| name: Option<Symbol>, |
| generics: &hir::Generics<'_>, |
| decl: &hir::FnDecl<'_>, |
| arg_idents: &[Option<Ident>], |
| body_id: Option<hir::BodyId>, |
| ) { |
| self.print_fn_header_info(header); |
| |
| if let Some(name) = name { |
| self.nbsp(); |
| self.print_name(name); |
| } |
| self.print_generic_params(generics.params); |
| |
| self.popen(); |
| // Make sure we aren't supplied *both* `arg_idents` and `body_id`. |
| assert!(arg_idents.is_empty() || body_id.is_none()); |
| let mut i = 0; |
| let mut print_arg = |s: &mut Self, ty: Option<&hir::Ty<'_>>| { |
| if i == 0 && decl.implicit_self.has_implicit_self() { |
| s.print_implicit_self(&decl.implicit_self); |
| } else { |
| if let Some(arg_ident) = arg_idents.get(i) { |
| if let Some(arg_ident) = arg_ident { |
| s.word(arg_ident.to_string()); |
| s.word(":"); |
| s.space(); |
| } |
| } else if let Some(body_id) = body_id { |
| s.ann.nested(s, Nested::BodyParamPat(body_id, i)); |
| s.word(":"); |
| s.space(); |
| } |
| if let Some(ty) = ty { |
| s.print_type(ty); |
| } |
| } |
| i += 1; |
| }; |
| self.commasep(Inconsistent, decl.inputs, |s, ty| { |
| let ib = s.ibox(INDENT_UNIT); |
| print_arg(s, Some(ty)); |
| s.end(ib); |
| }); |
| if decl.c_variadic { |
| if !decl.inputs.is_empty() { |
| self.word(", "); |
| } |
| print_arg(self, None); |
| self.word("..."); |
| } |
| self.pclose(); |
| |
| self.print_fn_output(decl); |
| self.print_where_clause(generics) |
| } |
| |
| fn print_closure_params(&mut self, decl: &hir::FnDecl<'_>, body_id: hir::BodyId) { |
| self.word("|"); |
| let mut i = 0; |
| self.commasep(Inconsistent, decl.inputs, |s, ty| { |
| let ib = s.ibox(INDENT_UNIT); |
| |
| s.ann.nested(s, Nested::BodyParamPat(body_id, i)); |
| i += 1; |
| |
| if let hir::TyKind::Infer(()) = ty.kind { |
| // Print nothing. |
| } else { |
| s.word(":"); |
| s.space(); |
| s.print_type(ty); |
| } |
| s.end(ib); |
| }); |
| self.word("|"); |
| |
| match decl.output { |
| hir::FnRetTy::Return(ty) => { |
| self.space_if_not_bol(); |
| self.word_space("->"); |
| self.print_type(ty); |
| self.maybe_print_comment(ty.span.lo()); |
| } |
| hir::FnRetTy::DefaultReturn(..) => {} |
| } |
| } |
| |
| fn print_capture_clause(&mut self, capture_clause: hir::CaptureBy) { |
| match capture_clause { |
| hir::CaptureBy::Value { .. } => self.word_space("move"), |
| hir::CaptureBy::Use { .. } => self.word_space("use"), |
| hir::CaptureBy::Ref => {} |
| } |
| } |
| |
| fn print_closure_binder( |
| &mut self, |
| binder: hir::ClosureBinder, |
| generic_params: &[GenericParam<'_>], |
| ) { |
| let generic_params = generic_params |
| .iter() |
| .filter(|p| { |
| matches!( |
| p, |
| GenericParam { |
| kind: GenericParamKind::Lifetime { kind: LifetimeParamKind::Explicit }, |
| .. |
| } |
| ) |
| }) |
| .collect::<Vec<_>>(); |
| |
| match binder { |
| hir::ClosureBinder::Default => {} |
| // We need to distinguish `|...| {}` from `for<> |...| {}` as `for<>` adds additional |
| // restrictions. |
| hir::ClosureBinder::For { .. } if generic_params.is_empty() => self.word("for<>"), |
| hir::ClosureBinder::For { .. } => { |
| self.word("for"); |
| self.word("<"); |
| |
| self.commasep(Inconsistent, &generic_params, |s, param| { |
| s.print_generic_param(param) |
| }); |
| |
| self.word(">"); |
| self.nbsp(); |
| } |
| } |
| } |
| |
| fn print_bounds<'b>( |
| &mut self, |
| prefix: &'static str, |
| bounds: impl IntoIterator<Item = &'b hir::GenericBound<'b>>, |
| ) { |
| let mut first = true; |
| for bound in bounds { |
| if first { |
| self.word(prefix); |
| } |
| if !(first && prefix.is_empty()) { |
| self.nbsp(); |
| } |
| if first { |
| first = false; |
| } else { |
| self.word_space("+"); |
| } |
| |
| match bound { |
| GenericBound::Trait(tref) => { |
| self.print_poly_trait_ref(tref); |
| } |
| GenericBound::Outlives(lt) => { |
| self.print_lifetime(lt); |
| } |
| GenericBound::Use(args, _) => { |
| self.word("use <"); |
| |
| self.commasep(Inconsistent, *args, |s, arg| { |
| s.print_precise_capturing_arg(*arg) |
| }); |
| |
| self.word(">"); |
| } |
| } |
| } |
| } |
| |
| fn print_precise_capturing_arg(&mut self, arg: PreciseCapturingArg<'_>) { |
| match arg { |
| PreciseCapturingArg::Lifetime(lt) => self.print_lifetime(lt), |
| PreciseCapturingArg::Param(arg) => self.print_ident(arg.ident), |
| } |
| } |
| |
| fn print_generic_params(&mut self, generic_params: &[GenericParam<'_>]) { |
| let is_lifetime_elided = |generic_param: &GenericParam<'_>| { |
| matches!( |
| generic_param.kind, |
| GenericParamKind::Lifetime { kind: LifetimeParamKind::Elided(_) } |
| ) |
| }; |
| |
| // We don't want to show elided lifetimes as they are compiler-inserted and not |
| // expressible in surface level Rust. |
| if !generic_params.is_empty() && !generic_params.iter().all(is_lifetime_elided) { |
| self.word("<"); |
| |
| self.commasep( |
| Inconsistent, |
| generic_params.iter().filter(|gp| !is_lifetime_elided(gp)), |
| |s, param| s.print_generic_param(param), |
| ); |
| |
| self.word(">"); |
| } |
| } |
| |
| fn print_generic_param(&mut self, param: &GenericParam<'_>) { |
| if let GenericParamKind::Const { .. } = param.kind { |
| self.word_space("const"); |
| } |
| |
| self.print_ident(param.name.ident()); |
| |
| match param.kind { |
| GenericParamKind::Lifetime { .. } => {} |
| GenericParamKind::Type { default, .. } => { |
| if let Some(default) = default { |
| self.space(); |
| self.word_space("="); |
| self.print_type(default); |
| } |
| } |
| GenericParamKind::Const { ty, ref default } => { |
| self.word_space(":"); |
| self.print_type(ty); |
| if let Some(default) = default { |
| self.space(); |
| self.word_space("="); |
| self.print_const_arg(default); |
| } |
| } |
| } |
| } |
| |
| fn print_lifetime(&mut self, lifetime: &hir::Lifetime) { |
| self.print_ident(lifetime.ident) |
| } |
| |
| fn print_where_clause(&mut self, generics: &hir::Generics<'_>) { |
| if generics.predicates.is_empty() { |
| return; |
| } |
| |
| self.space(); |
| self.word_space("where"); |
| |
| for (i, predicate) in generics.predicates.iter().enumerate() { |
| if i != 0 { |
| self.word_space(","); |
| } |
| self.print_where_predicate(predicate); |
| } |
| } |
| |
| fn print_where_predicate(&mut self, predicate: &hir::WherePredicate<'_>) { |
| self.print_attrs(self.attrs(predicate.hir_id)); |
| match *predicate.kind { |
| hir::WherePredicateKind::BoundPredicate(hir::WhereBoundPredicate { |
| bound_generic_params, |
| bounded_ty, |
| bounds, |
| .. |
| }) => { |
| self.print_formal_generic_params(bound_generic_params); |
| self.print_type(bounded_ty); |
| self.print_bounds(":", bounds); |
| } |
| hir::WherePredicateKind::RegionPredicate(hir::WhereRegionPredicate { |
| lifetime, |
| bounds, |
| .. |
| }) => { |
| self.print_lifetime(lifetime); |
| self.word(":"); |
| |
| for (i, bound) in bounds.iter().enumerate() { |
| match bound { |
| GenericBound::Outlives(lt) => { |
| self.print_lifetime(lt); |
| } |
| _ => panic!("unexpected bound on lifetime param: {bound:?}"), |
| } |
| |
| if i != 0 { |
| self.word(":"); |
| } |
| } |
| } |
| hir::WherePredicateKind::EqPredicate(hir::WhereEqPredicate { |
| lhs_ty, rhs_ty, .. |
| }) => { |
| self.print_type(lhs_ty); |
| self.space(); |
| self.word_space("="); |
| self.print_type(rhs_ty); |
| } |
| } |
| } |
| |
| fn print_mutability(&mut self, mutbl: hir::Mutability, print_const: bool) { |
| match mutbl { |
| hir::Mutability::Mut => self.word_nbsp("mut"), |
| hir::Mutability::Not => { |
| if print_const { |
| self.word_nbsp("const") |
| } |
| } |
| } |
| } |
| |
| fn print_mt(&mut self, mt: &hir::MutTy<'_>, print_const: bool) { |
| self.print_mutability(mt.mutbl, print_const); |
| self.print_type(mt.ty); |
| } |
| |
| fn print_fn_output(&mut self, decl: &hir::FnDecl<'_>) { |
| match decl.output { |
| hir::FnRetTy::Return(ty) => { |
| self.space_if_not_bol(); |
| let ib = self.ibox(INDENT_UNIT); |
| self.word_space("->"); |
| self.print_type(ty); |
| self.end(ib); |
| |
| if let hir::FnRetTy::Return(output) = decl.output { |
| self.maybe_print_comment(output.span.lo()); |
| } |
| } |
| hir::FnRetTy::DefaultReturn(..) => {} |
| } |
| } |
| |
| fn print_ty_fn( |
| &mut self, |
| abi: ExternAbi, |
| safety: hir::Safety, |
| decl: &hir::FnDecl<'_>, |
| name: Option<Symbol>, |
| generic_params: &[hir::GenericParam<'_>], |
| arg_idents: &[Option<Ident>], |
| ) { |
| let ib = self.ibox(INDENT_UNIT); |
| self.print_formal_generic_params(generic_params); |
| let generics = hir::Generics::empty(); |
| self.print_fn( |
| hir::FnHeader { |
| safety: safety.into(), |
| abi, |
| constness: hir::Constness::NotConst, |
| asyncness: hir::IsAsync::NotAsync, |
| }, |
| name, |
| generics, |
| decl, |
| arg_idents, |
| None, |
| ); |
| self.end(ib); |
| } |
| |
| fn print_fn_header_info(&mut self, header: hir::FnHeader) { |
| self.print_constness(header.constness); |
| |
| let safety = match header.safety { |
| hir::HeaderSafety::SafeTargetFeatures => { |
| self.word_nbsp("#[target_feature]"); |
| hir::Safety::Safe |
| } |
| hir::HeaderSafety::Normal(safety) => safety, |
| }; |
| |
| match header.asyncness { |
| hir::IsAsync::NotAsync => {} |
| hir::IsAsync::Async(_) => self.word_nbsp("async"), |
| } |
| |
| self.print_safety(safety); |
| |
| if header.abi != ExternAbi::Rust { |
| self.word_nbsp("extern"); |
| self.word_nbsp(header.abi.to_string()); |
| } |
| |
| self.word("fn") |
| } |
| |
| fn print_constness(&mut self, s: hir::Constness) { |
| match s { |
| hir::Constness::NotConst => {} |
| hir::Constness::Const => self.word_nbsp("const"), |
| } |
| } |
| |
| fn print_safety(&mut self, s: hir::Safety) { |
| match s { |
| hir::Safety::Safe => {} |
| hir::Safety::Unsafe => self.word_nbsp("unsafe"), |
| } |
| } |
| |
| fn print_is_auto(&mut self, s: hir::IsAuto) { |
| match s { |
| hir::IsAuto::Yes => self.word_nbsp("auto"), |
| hir::IsAuto::No => {} |
| } |
| } |
| } |
| |
| /// Does this expression require a semicolon to be treated |
| /// as a statement? The negation of this: 'can this expression |
| /// be used as a statement without a semicolon' -- is used |
| /// as an early-bail-out in the parser so that, for instance, |
| /// if true {...} else {...} |
| /// |x| 5 |
| /// isn't parsed as (if true {...} else {...} | x) | 5 |
| // |
| // Duplicated from `parse::classify`, but adapted for the HIR. |
| fn expr_requires_semi_to_be_stmt(e: &hir::Expr<'_>) -> bool { |
| !matches!( |
| e.kind, |
| hir::ExprKind::If(..) |
| | hir::ExprKind::Match(..) |
| | hir::ExprKind::Block(..) |
| | hir::ExprKind::Loop(..) |
| ) |
| } |
| |
| /// This statement requires a semicolon after it. |
| /// note that in one case (stmt_semi), we've already |
| /// seen the semicolon, and thus don't need another. |
| fn stmt_ends_with_semi(stmt: &hir::StmtKind<'_>) -> bool { |
| match *stmt { |
| hir::StmtKind::Let(_) => true, |
| hir::StmtKind::Item(_) => false, |
| hir::StmtKind::Expr(e) => expr_requires_semi_to_be_stmt(e), |
| hir::StmtKind::Semi(..) => false, |
| } |
| } |
| |
| /// Expressions that syntactically contain an "exterior" struct literal, i.e., not surrounded by any |
| /// parens or other delimiters, e.g., `X { y: 1 }`, `X { y: 1 }.method()`, `foo == X { y: 1 }` and |
| /// `X { y: 1 } == foo` all do, but `(X { y: 1 }) == foo` does not. |
| fn contains_exterior_struct_lit(value: &hir::Expr<'_>) -> bool { |
| match value.kind { |
| hir::ExprKind::Struct(..) => true, |
| |
| hir::ExprKind::Assign(lhs, rhs, _) |
| | hir::ExprKind::AssignOp(_, lhs, rhs) |
| | hir::ExprKind::Binary(_, lhs, rhs) => { |
| // `X { y: 1 } + X { y: 2 }` |
| contains_exterior_struct_lit(lhs) || contains_exterior_struct_lit(rhs) |
| } |
| hir::ExprKind::Unary(_, x) |
| | hir::ExprKind::Cast(x, _) |
| | hir::ExprKind::Type(x, _) |
| | hir::ExprKind::Field(x, _) |
| | hir::ExprKind::Index(x, _, _) => { |
| // `&X { y: 1 }, X { y: 1 }.y` |
| contains_exterior_struct_lit(x) |
| } |
| |
| hir::ExprKind::MethodCall(_, receiver, ..) => { |
| // `X { y: 1 }.bar(...)` |
| contains_exterior_struct_lit(receiver) |
| } |
| |
| _ => false, |
| } |
| } |
