| #![cfg_attr(bootstrap, feature(or_patterns))] |
| #![recursion_limit = "256"] |
| |
| use rustc_ast as ast; |
| use rustc_ast::util::parser::{self, AssocOp, Fixity}; |
| use rustc_ast_pretty::pp::Breaks::{Consistent, Inconsistent}; |
| use rustc_ast_pretty::pp::{self, Breaks}; |
| use rustc_ast_pretty::pprust::{Comments, PrintState}; |
| use rustc_hir as hir; |
| use rustc_hir::{GenericArg, GenericParam, GenericParamKind, Node}; |
| use rustc_hir::{GenericBound, PatKind, RangeEnd, TraitBoundModifier}; |
| use rustc_span::source_map::{SourceMap, Spanned}; |
| use rustc_span::symbol::{kw, Ident, IdentPrinter, Symbol}; |
| use rustc_span::{self, BytePos, FileName}; |
| use rustc_target::spec::abi::Abi; |
| |
| use std::borrow::Cow; |
| use std::cell::Cell; |
| use std::collections::BTreeMap; |
| use std::vec; |
| |
| pub fn id_to_string(map: &dyn rustc_hir::intravisit::Map<'_>, hir_id: hir::HirId) -> String { |
| to_string(&map, |s| s.print_node(map.find(hir_id).unwrap())) |
| } |
| |
| pub enum AnnNode<'a> { |
| Name(&'a Symbol), |
| Block(&'a hir::Block<'a>), |
| Item(&'a hir::Item<'a>), |
| SubItem(hir::HirId), |
| Expr(&'a hir::Expr<'a>), |
| Pat(&'a hir::Pat<'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<'_>) {} |
| } |
| |
| pub struct NoAnn; |
| impl PpAnn for NoAnn {} |
| pub const NO_ANN: &dyn PpAnn = &NoAnn; |
| |
| impl PpAnn for hir::Crate<'_> { |
| fn nested(&self, state: &mut State<'_>, nested: Nested) { |
| match nested { |
| Nested::Item(id) => state.print_item(self.item(id)), |
| Nested::TraitItem(id) => state.print_trait_item(self.trait_item(id)), |
| Nested::ImplItem(id) => state.print_impl_item(self.impl_item(id)), |
| Nested::ForeignItem(id) => state.print_foreign_item(self.foreign_item(id)), |
| Nested::Body(id) => state.print_expr(&self.body(id).value), |
| Nested::BodyParamPat(id, i) => state.print_pat(&self.body(id).params[i].pat), |
| } |
| } |
| } |
| |
| /// Identical to the `PpAnn` implementation for `hir::Crate`, |
| /// except it avoids creating a dependency on the whole crate. |
| impl PpAnn for &dyn rustc_hir::intravisit::Map<'_> { |
| fn nested(&self, state: &mut State<'_>, nested: Nested) { |
| match nested { |
| Nested::Item(id) => state.print_item(self.item(id)), |
| Nested::TraitItem(id) => state.print_trait_item(self.trait_item(id)), |
| Nested::ImplItem(id) => state.print_impl_item(self.impl_item(id)), |
| Nested::ForeignItem(id) => state.print_foreign_item(self.foreign_item(id)), |
| Nested::Body(id) => state.print_expr(&self.body(id).value), |
| Nested::BodyParamPat(id, i) => state.print_pat(&self.body(id).params[i].pat), |
| } |
| } |
| } |
| |
| pub struct State<'a> { |
| pub s: pp::Printer, |
| comments: Option<Comments<'a>>, |
| attrs: &'a BTreeMap<hir::HirId, &'a [ast::Attribute]>, |
| ann: &'a (dyn PpAnn + 'a), |
| } |
| |
| impl<'a> State<'a> { |
| pub 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::Expr(a) => self.print_expr(&a), |
| Node::Stmt(a) => self.print_stmt(&a), |
| Node::PathSegment(a) => self.print_path_segment(&a), |
| Node::Ty(a) => self.print_type(&a), |
| Node::TraitRef(a) => self.print_trait_ref(&a), |
| Node::Binding(a) | Node::Pat(a) => self.print_pat(&a), |
| Node::Arm(a) => self.print_arm(&a), |
| Node::Block(a) => { |
| // Containing cbox, will be closed by print-block at `}`. |
| self.cbox(INDENT_UNIT); |
| // Head-ibox, will be closed by print-block after `{`. |
| self.ibox(0); |
| self.print_block(&a) |
| } |
| Node::Lifetime(a) => self.print_lifetime(&a), |
| Node::Visibility(a) => self.print_visibility(&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::Local(a) => self.print_local_decl(&a), |
| Node::MacroDef(_) => panic!("cannot print MacroDef"), |
| Node::Crate(..) => panic!("cannot print Crate"), |
| } |
| } |
| } |
| |
| 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(&mut self) -> &mut Option<Comments<'a>> { |
| &mut self.comments |
| } |
| |
| fn print_ident(&mut self, ident: Ident) { |
| self.s.word(IdentPrinter::for_ast_ident(ident, ident.is_raw_guess()).to_string()); |
| 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"); |
| } |
| } |
| |
| pub const INDENT_UNIT: usize = 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::Crate<'_>, |
| filename: FileName, |
| input: String, |
| ann: &'a dyn PpAnn, |
| ) -> String { |
| let mut s = State::new_from_input(sm, filename, input, &krate.attrs, ann); |
| |
| // 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.item, s.attrs(hir::CRATE_HIR_ID)); |
| s.print_remaining_comments(); |
| s.s.eof() |
| } |
| |
| impl<'a> State<'a> { |
| pub fn new_from_input( |
| sm: &'a SourceMap, |
| filename: FileName, |
| input: String, |
| attrs: &'a BTreeMap<hir::HirId, &[ast::Attribute]>, |
| ann: &'a dyn PpAnn, |
| ) -> State<'a> { |
| State { |
| s: pp::mk_printer(), |
| comments: Some(Comments::new(sm, filename, input)), |
| attrs, |
| ann, |
| } |
| } |
| |
| fn attrs(&self, id: hir::HirId) -> &'a [ast::Attribute] { |
| self.attrs.get(&id).map_or(&[], |la| *la) |
| } |
| } |
| |
| pub fn to_string<F>(ann: &dyn PpAnn, f: F) -> String |
| where |
| F: FnOnce(&mut State<'_>), |
| { |
| let mut printer = |
| State { s: pp::mk_printer(), comments: None, attrs: &BTreeMap::default(), ann }; |
| f(&mut printer); |
| printer.s.eof() |
| } |
| |
| pub fn visibility_qualified<S: Into<Cow<'static, str>>>(vis: &hir::Visibility<'_>, w: S) -> String { |
| to_string(NO_ANN, |s| { |
| s.print_visibility(vis); |
| s.s.word(w) |
| }) |
| } |
| |
| pub fn generic_params_to_string(generic_params: &[GenericParam<'_>]) -> String { |
| to_string(NO_ANN, |s| s.print_generic_params(generic_params)) |
| } |
| |
| pub fn bounds_to_string<'b>(bounds: impl IntoIterator<Item = &'b hir::GenericBound<'b>>) -> String { |
| to_string(NO_ANN, |s| s.print_bounds("", bounds)) |
| } |
| |
| pub fn ty_to_string(ty: &hir::Ty<'_>) -> String { |
| to_string(NO_ANN, |s| s.print_type(ty)) |
| } |
| |
| pub fn path_segment_to_string(segment: &hir::PathSegment<'_>) -> String { |
| to_string(NO_ANN, |s| s.print_path_segment(segment)) |
| } |
| |
| pub fn path_to_string(segment: &hir::Path<'_>) -> String { |
| to_string(NO_ANN, |s| s.print_path(segment, false)) |
| } |
| |
| pub fn fn_to_string( |
| decl: &hir::FnDecl<'_>, |
| header: hir::FnHeader, |
| name: Option<Symbol>, |
| generics: &hir::Generics<'_>, |
| vis: &hir::Visibility<'_>, |
| arg_names: &[Ident], |
| body_id: Option<hir::BodyId>, |
| ) -> String { |
| to_string(NO_ANN, |s| s.print_fn(decl, header, name, generics, vis, arg_names, body_id)) |
| } |
| |
| pub fn enum_def_to_string( |
| enum_definition: &hir::EnumDef<'_>, |
| generics: &hir::Generics<'_>, |
| name: Symbol, |
| span: rustc_span::Span, |
| visibility: &hir::Visibility<'_>, |
| ) -> String { |
| to_string(NO_ANN, |s| s.print_enum_def(enum_definition, generics, name, span, visibility)) |
| } |
| |
| impl<'a> State<'a> { |
| pub fn cbox(&mut self, u: usize) { |
| self.s.cbox(u); |
| } |
| |
| pub fn nbsp(&mut self) { |
| self.s.word(" ") |
| } |
| |
| pub fn word_nbsp<S: Into<Cow<'static, str>>>(&mut self, w: S) { |
| self.s.word(w); |
| self.nbsp() |
| } |
| |
| pub fn head<S: Into<Cow<'static, str>>>(&mut self, w: S) { |
| let w = w.into(); |
| // outer-box is consistent |
| self.cbox(INDENT_UNIT); |
| // head-box is inconsistent |
| self.ibox(w.len() + 1); |
| // keyword that starts the head |
| if !w.is_empty() { |
| self.word_nbsp(w); |
| } |
| } |
| |
| pub fn bopen(&mut self) { |
| self.s.word("{"); |
| self.end(); // close the head-box |
| } |
| |
| pub fn bclose_maybe_open(&mut self, span: rustc_span::Span, close_box: bool) { |
| self.maybe_print_comment(span.hi()); |
| self.break_offset_if_not_bol(1, -(INDENT_UNIT as isize)); |
| self.s.word("}"); |
| if close_box { |
| self.end(); // close the outer-box |
| } |
| } |
| |
| pub fn bclose(&mut self, span: rustc_span::Span) { |
| self.bclose_maybe_open(span, true) |
| } |
| |
| pub fn space_if_not_bol(&mut self) { |
| if !self.s.is_beginning_of_line() { |
| self.s.space(); |
| } |
| } |
| |
| pub fn break_offset_if_not_bol(&mut self, n: usize, off: isize) { |
| if !self.s.is_beginning_of_line() { |
| self.s.break_offset(n, off) |
| } else if off != 0 && self.s.last_token().is_hardbreak_tok() { |
| // We do something pretty sketchy here: tuck the nonzero |
| // offset-adjustment we were going to deposit along with the |
| // break into the previous hardbreak. |
| self.s.replace_last_token(pp::Printer::hardbreak_tok_offset(off)); |
| } |
| } |
| |
| // Synthesizes a comment that was not textually present in the original source |
| // file. |
| pub fn synth_comment(&mut self, text: String) { |
| self.s.word("/*"); |
| self.s.space(); |
| self.s.word(text); |
| self.s.space(); |
| self.s.word("*/") |
| } |
| |
| pub 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, |
| { |
| 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.s.word(","); |
| self.maybe_print_trailing_comment(get_span(elt), Some(get_span(&elts[i]).hi())); |
| self.space_if_not_bol(); |
| } |
| } |
| self.end(); |
| } |
| |
| pub fn commasep_exprs(&mut self, b: Breaks, exprs: &[hir::Expr<'_>]) { |
| self.commasep_cmnt(b, exprs, |s, e| s.print_expr(&e), |e| e.span) |
| } |
| |
| pub fn print_mod(&mut self, _mod: &hir::Mod<'_>, attrs: &[ast::Attribute]) { |
| self.print_inner_attributes(attrs); |
| for &item_id in _mod.item_ids { |
| self.ann.nested(self, Nested::Item(item_id)); |
| } |
| } |
| |
| pub fn print_opt_lifetime(&mut self, lifetime: &hir::Lifetime) { |
| if !lifetime.is_elided() { |
| self.print_lifetime(lifetime); |
| self.nbsp(); |
| } |
| } |
| |
| pub fn print_type(&mut self, ty: &hir::Ty<'_>) { |
| self.maybe_print_comment(ty.span.lo()); |
| self.ibox(0); |
| match ty.kind { |
| hir::TyKind::Slice(ref ty) => { |
| self.s.word("["); |
| self.print_type(&ty); |
| self.s.word("]"); |
| } |
| hir::TyKind::Ptr(ref mt) => { |
| self.s.word("*"); |
| self.print_mt(mt, true); |
| } |
| hir::TyKind::Rptr(ref lifetime, ref mt) => { |
| self.s.word("&"); |
| self.print_opt_lifetime(lifetime); |
| self.print_mt(mt, false); |
| } |
| hir::TyKind::Never => { |
| self.s.word("!"); |
| } |
| hir::TyKind::Tup(ref elts) => { |
| self.popen(); |
| self.commasep(Inconsistent, &elts[..], |s, ty| s.print_type(&ty)); |
| if elts.len() == 1 { |
| self.s.word(","); |
| } |
| self.pclose(); |
| } |
| hir::TyKind::BareFn(ref f) => { |
| self.print_ty_fn( |
| f.abi, |
| f.unsafety, |
| &f.decl, |
| None, |
| &f.generic_params, |
| f.param_names, |
| ); |
| } |
| hir::TyKind::OpaqueDef(..) => self.s.word("/*impl Trait*/"), |
| hir::TyKind::Path(ref qpath) => self.print_qpath(qpath, false), |
| hir::TyKind::TraitObject(bounds, ref lifetime, syntax) => { |
| if syntax == ast::TraitObjectSyntax::Dyn { |
| self.word_space("dyn"); |
| } |
| 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); |
| } |
| } |
| hir::TyKind::Array(ref ty, ref length) => { |
| self.s.word("["); |
| self.print_type(&ty); |
| self.s.word("; "); |
| self.print_anon_const(length); |
| self.s.word("]"); |
| } |
| hir::TyKind::Typeof(ref e) => { |
| self.s.word("typeof("); |
| self.print_anon_const(e); |
| self.s.word(")"); |
| } |
| hir::TyKind::Infer => { |
| self.s.word("_"); |
| } |
| hir::TyKind::Err => { |
| self.popen(); |
| self.s.word("/*ERROR*/"); |
| self.pclose(); |
| } |
| } |
| self.end() |
| } |
| |
| pub fn print_foreign_item(&mut self, item: &hir::ForeignItem<'_>) { |
| self.hardbreak_if_not_bol(); |
| self.maybe_print_comment(item.span.lo()); |
| self.print_outer_attributes(self.attrs(item.hir_id())); |
| match item.kind { |
| hir::ForeignItemKind::Fn(ref decl, ref arg_names, ref generics) => { |
| self.head(""); |
| self.print_fn( |
| decl, |
| hir::FnHeader { |
| unsafety: hir::Unsafety::Normal, |
| constness: hir::Constness::NotConst, |
| abi: Abi::Rust, |
| asyncness: hir::IsAsync::NotAsync, |
| }, |
| Some(item.ident.name), |
| generics, |
| &item.vis, |
| arg_names, |
| None, |
| ); |
| self.end(); // end head-ibox |
| self.s.word(";"); |
| self.end() // end the outer fn box |
| } |
| hir::ForeignItemKind::Static(ref t, m) => { |
| self.head(visibility_qualified(&item.vis, "static")); |
| if m == hir::Mutability::Mut { |
| self.word_space("mut"); |
| } |
| self.print_ident(item.ident); |
| self.word_space(":"); |
| self.print_type(&t); |
| self.s.word(";"); |
| self.end(); // end the head-ibox |
| self.end() // end the outer cbox |
| } |
| hir::ForeignItemKind::Type => { |
| self.head(visibility_qualified(&item.vis, "type")); |
| self.print_ident(item.ident); |
| self.s.word(";"); |
| self.end(); // end the head-ibox |
| self.end() // end the outer cbox |
| } |
| } |
| } |
| |
| fn print_associated_const( |
| &mut self, |
| ident: Ident, |
| ty: &hir::Ty<'_>, |
| default: Option<hir::BodyId>, |
| vis: &hir::Visibility<'_>, |
| ) { |
| self.s.word(visibility_qualified(vis, "")); |
| self.word_space("const"); |
| self.print_ident(ident); |
| self.word_space(":"); |
| self.print_type(ty); |
| if let Some(expr) = default { |
| self.s.space(); |
| self.word_space("="); |
| self.ann.nested(self, Nested::Body(expr)); |
| } |
| self.s.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.where_clause); |
| if let Some(ty) = ty { |
| self.s.space(); |
| self.word_space("="); |
| self.print_type(ty); |
| } |
| self.s.word(";") |
| } |
| |
| fn print_item_type( |
| &mut self, |
| item: &hir::Item<'_>, |
| generics: &hir::Generics<'_>, |
| inner: impl Fn(&mut Self), |
| ) { |
| self.head(visibility_qualified(&item.vis, "type")); |
| self.print_ident(item.ident); |
| self.print_generic_params(&generics.params); |
| self.end(); // end the inner ibox |
| |
| self.print_where_clause(&generics.where_clause); |
| self.s.space(); |
| inner(self); |
| self.s.word(";"); |
| self.end(); // end the outer ibox |
| } |
| |
| /// Pretty-print an item |
| pub 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_outer_attributes(attrs); |
| self.ann.pre(self, AnnNode::Item(item)); |
| match item.kind { |
| hir::ItemKind::ExternCrate(orig_name) => { |
| self.head(visibility_qualified(&item.vis, "extern crate")); |
| if let Some(orig_name) = orig_name { |
| self.print_name(orig_name); |
| self.s.space(); |
| self.s.word("as"); |
| self.s.space(); |
| } |
| self.print_ident(item.ident); |
| self.s.word(";"); |
| self.end(); // end inner head-block |
| self.end(); // end outer head-block |
| } |
| hir::ItemKind::Use(ref path, kind) => { |
| self.head(visibility_qualified(&item.vis, "use")); |
| self.print_path(path, false); |
| |
| match kind { |
| hir::UseKind::Single => { |
| if path.segments.last().unwrap().ident != item.ident { |
| self.s.space(); |
| self.word_space("as"); |
| self.print_ident(item.ident); |
| } |
| self.s.word(";"); |
| } |
| hir::UseKind::Glob => self.s.word("::*;"), |
| hir::UseKind::ListStem => self.s.word("::{};"), |
| } |
| self.end(); // end inner head-block |
| self.end(); // end outer head-block |
| } |
| hir::ItemKind::Static(ref ty, m, expr) => { |
| self.head(visibility_qualified(&item.vis, "static")); |
| if m == hir::Mutability::Mut { |
| self.word_space("mut"); |
| } |
| self.print_ident(item.ident); |
| self.word_space(":"); |
| self.print_type(&ty); |
| self.s.space(); |
| self.end(); // end the head-ibox |
| |
| self.word_space("="); |
| self.ann.nested(self, Nested::Body(expr)); |
| self.s.word(";"); |
| self.end(); // end the outer cbox |
| } |
| hir::ItemKind::Const(ref ty, expr) => { |
| self.head(visibility_qualified(&item.vis, "const")); |
| self.print_ident(item.ident); |
| self.word_space(":"); |
| self.print_type(&ty); |
| self.s.space(); |
| self.end(); // end the head-ibox |
| |
| self.word_space("="); |
| self.ann.nested(self, Nested::Body(expr)); |
| self.s.word(";"); |
| self.end(); // end the outer cbox |
| } |
| hir::ItemKind::Fn(ref sig, ref param_names, body) => { |
| self.head(""); |
| self.print_fn( |
| &sig.decl, |
| sig.header, |
| Some(item.ident.name), |
| param_names, |
| &item.vis, |
| &[], |
| Some(body), |
| ); |
| self.s.word(" "); |
| self.end(); // need to close a box |
| self.end(); // need to close a box |
| self.ann.nested(self, Nested::Body(body)); |
| } |
| hir::ItemKind::Mod(ref _mod) => { |
| self.head(visibility_qualified(&item.vis, "mod")); |
| self.print_ident(item.ident); |
| self.nbsp(); |
| self.bopen(); |
| self.print_mod(_mod, attrs); |
| self.bclose(item.span); |
| } |
| hir::ItemKind::ForeignMod { abi, items } => { |
| self.head("extern"); |
| self.word_nbsp(abi.to_string()); |
| self.bopen(); |
| self.print_inner_attributes(self.attrs(item.hir_id())); |
| for item in items { |
| self.ann.nested(self, Nested::ForeignItem(item.id)); |
| } |
| self.bclose(item.span); |
| } |
| hir::ItemKind::GlobalAsm(ref ga) => { |
| self.head(visibility_qualified(&item.vis, "global asm")); |
| self.s.word(ga.asm.to_string()); |
| self.end() |
| } |
| hir::ItemKind::TyAlias(ref ty, ref generics) => { |
| self.print_item_type(item, &generics, |state| { |
| state.word_space("="); |
| state.print_type(&ty); |
| }); |
| } |
| hir::ItemKind::OpaqueTy(ref opaque_ty) => { |
| self.print_item_type(item, &opaque_ty.generics, |state| { |
| let mut real_bounds = Vec::with_capacity(opaque_ty.bounds.len()); |
| for b in opaque_ty.bounds.iter() { |
| if let GenericBound::Trait(ref ptr, hir::TraitBoundModifier::Maybe) = *b { |
| state.s.space(); |
| state.word_space("for ?"); |
| state.print_trait_ref(&ptr.trait_ref); |
| } else { |
| real_bounds.push(b); |
| } |
| } |
| state.print_bounds("= impl", real_bounds); |
| }); |
| } |
| hir::ItemKind::Enum(ref enum_definition, ref params) => { |
| self.print_enum_def(enum_definition, params, item.ident.name, item.span, &item.vis); |
| } |
| hir::ItemKind::Struct(ref struct_def, ref generics) => { |
| self.head(visibility_qualified(&item.vis, "struct")); |
| self.print_struct(struct_def, generics, item.ident.name, item.span, true); |
| } |
| hir::ItemKind::Union(ref struct_def, ref generics) => { |
| self.head(visibility_qualified(&item.vis, "union")); |
| self.print_struct(struct_def, generics, item.ident.name, item.span, true); |
| } |
| hir::ItemKind::Impl(hir::Impl { |
| unsafety, |
| polarity, |
| defaultness, |
| constness, |
| defaultness_span: _, |
| ref generics, |
| ref of_trait, |
| ref self_ty, |
| items, |
| }) => { |
| self.head(""); |
| self.print_visibility(&item.vis); |
| self.print_defaultness(defaultness); |
| self.print_unsafety(unsafety); |
| self.word_nbsp("impl"); |
| |
| if !generics.params.is_empty() { |
| self.print_generic_params(&generics.params); |
| self.s.space(); |
| } |
| |
| if constness == hir::Constness::Const { |
| self.word_nbsp("const"); |
| } |
| |
| if let hir::ImplPolarity::Negative(_) = polarity { |
| self.s.word("!"); |
| } |
| |
| if let Some(ref t) = of_trait { |
| self.print_trait_ref(t); |
| self.s.space(); |
| self.word_space("for"); |
| } |
| |
| self.print_type(&self_ty); |
| self.print_where_clause(&generics.where_clause); |
| |
| self.s.space(); |
| self.bopen(); |
| self.print_inner_attributes(attrs); |
| for impl_item in items { |
| self.ann.nested(self, Nested::ImplItem(impl_item.id)); |
| } |
| self.bclose(item.span); |
| } |
| hir::ItemKind::Trait(is_auto, unsafety, ref generics, ref bounds, trait_items) => { |
| self.head(""); |
| self.print_visibility(&item.vis); |
| self.print_is_auto(is_auto); |
| self.print_unsafety(unsafety); |
| self.word_nbsp("trait"); |
| self.print_ident(item.ident); |
| self.print_generic_params(&generics.params); |
| let mut real_bounds = Vec::with_capacity(bounds.len()); |
| for b in bounds.iter() { |
| if let GenericBound::Trait(ref ptr, hir::TraitBoundModifier::Maybe) = *b { |
| self.s.space(); |
| self.word_space("for ?"); |
| self.print_trait_ref(&ptr.trait_ref); |
| } else { |
| real_bounds.push(b); |
| } |
| } |
| self.print_bounds(":", real_bounds); |
| self.print_where_clause(&generics.where_clause); |
| self.s.word(" "); |
| self.bopen(); |
| for trait_item in trait_items { |
| self.ann.nested(self, Nested::TraitItem(trait_item.id)); |
| } |
| self.bclose(item.span); |
| } |
| hir::ItemKind::TraitAlias(ref generics, ref bounds) => { |
| self.head(""); |
| self.print_visibility(&item.vis); |
| self.word_nbsp("trait"); |
| self.print_ident(item.ident); |
| self.print_generic_params(&generics.params); |
| let mut real_bounds = Vec::with_capacity(bounds.len()); |
| // FIXME(durka) this seems to be some quite outdated syntax |
| for b in bounds.iter() { |
| if let GenericBound::Trait(ref ptr, hir::TraitBoundModifier::Maybe) = *b { |
| self.s.space(); |
| self.word_space("for ?"); |
| self.print_trait_ref(&ptr.trait_ref); |
| } else { |
| real_bounds.push(b); |
| } |
| } |
| self.nbsp(); |
| self.print_bounds("=", real_bounds); |
| self.print_where_clause(&generics.where_clause); |
| self.s.word(";"); |
| } |
| } |
| self.ann.post(self, AnnNode::Item(item)) |
| } |
| |
| pub 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.s.word("for"); |
| self.print_generic_params(generic_params); |
| self.nbsp(); |
| } |
| } |
| |
| fn print_poly_trait_ref(&mut self, t: &hir::PolyTraitRef<'_>) { |
| self.print_formal_generic_params(&t.bound_generic_params); |
| self.print_trait_ref(&t.trait_ref) |
| } |
| |
| pub fn print_enum_def( |
| &mut self, |
| enum_definition: &hir::EnumDef<'_>, |
| generics: &hir::Generics<'_>, |
| name: Symbol, |
| span: rustc_span::Span, |
| visibility: &hir::Visibility<'_>, |
| ) { |
| self.head(visibility_qualified(visibility, "enum")); |
| self.print_name(name); |
| self.print_generic_params(&generics.params); |
| self.print_where_clause(&generics.where_clause); |
| self.s.space(); |
| self.print_variants(&enum_definition.variants, span) |
| } |
| |
| pub fn print_variants(&mut self, variants: &[hir::Variant<'_>], span: rustc_span::Span) { |
| self.bopen(); |
| for v in variants { |
| self.space_if_not_bol(); |
| self.maybe_print_comment(v.span.lo()); |
| self.print_outer_attributes(self.attrs(v.id)); |
| self.ibox(INDENT_UNIT); |
| self.print_variant(v); |
| self.s.word(","); |
| self.end(); |
| self.maybe_print_trailing_comment(v.span, None); |
| } |
| self.bclose(span) |
| } |
| |
| pub fn print_visibility(&mut self, vis: &hir::Visibility<'_>) { |
| match vis.node { |
| hir::VisibilityKind::Public => self.word_nbsp("pub"), |
| hir::VisibilityKind::Crate(ast::CrateSugar::JustCrate) => self.word_nbsp("crate"), |
| hir::VisibilityKind::Crate(ast::CrateSugar::PubCrate) => self.word_nbsp("pub(crate)"), |
| hir::VisibilityKind::Restricted { ref path, .. } => { |
| self.s.word("pub("); |
| if path.segments.len() == 1 && path.segments[0].ident.name == kw::Super { |
| // Special case: `super` can print like `pub(super)`. |
| self.s.word("super"); |
| } else { |
| // Everything else requires `in` at present. |
| self.word_nbsp("in"); |
| self.print_path(path, false); |
| } |
| self.word_nbsp(")"); |
| } |
| hir::VisibilityKind::Inherited => (), |
| } |
| } |
| |
| pub fn print_defaultness(&mut self, defaultness: hir::Defaultness) { |
| match defaultness { |
| hir::Defaultness::Default { .. } => self.word_nbsp("default"), |
| hir::Defaultness::Final => (), |
| } |
| } |
| |
| pub fn print_struct( |
| &mut self, |
| struct_def: &hir::VariantData<'_>, |
| generics: &hir::Generics<'_>, |
| name: Symbol, |
| span: rustc_span::Span, |
| print_finalizer: bool, |
| ) { |
| 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_outer_attributes(s.attrs(field.hir_id)); |
| s.print_visibility(&field.vis); |
| s.print_type(&field.ty) |
| }); |
| self.pclose(); |
| } |
| self.print_where_clause(&generics.where_clause); |
| if print_finalizer { |
| self.s.word(";"); |
| } |
| self.end(); |
| self.end() // close the outer-box |
| } |
| hir::VariantData::Struct(..) => { |
| self.print_where_clause(&generics.where_clause); |
| self.nbsp(); |
| self.bopen(); |
| 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_outer_attributes(self.attrs(field.hir_id)); |
| self.print_visibility(&field.vis); |
| self.print_ident(field.ident); |
| self.word_nbsp(":"); |
| self.print_type(&field.ty); |
| self.s.word(","); |
| } |
| |
| self.bclose(span) |
| } |
| } |
| } |
| |
| pub fn print_variant(&mut self, v: &hir::Variant<'_>) { |
| self.head(""); |
| let generics = hir::Generics::empty(); |
| self.print_struct(&v.data, &generics, v.ident.name, v.span, false); |
| if let Some(ref d) = v.disr_expr { |
| self.s.space(); |
| self.word_space("="); |
| self.print_anon_const(d); |
| } |
| } |
| pub fn print_method_sig( |
| &mut self, |
| ident: Ident, |
| m: &hir::FnSig<'_>, |
| generics: &hir::Generics<'_>, |
| vis: &hir::Visibility<'_>, |
| arg_names: &[Ident], |
| body_id: Option<hir::BodyId>, |
| ) { |
| self.print_fn(&m.decl, m.header, Some(ident.name), generics, vis, arg_names, body_id) |
| } |
| |
| pub 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_outer_attributes(self.attrs(ti.hir_id())); |
| match ti.kind { |
| hir::TraitItemKind::Const(ref ty, default) => { |
| let vis = |
| Spanned { span: rustc_span::DUMMY_SP, node: hir::VisibilityKind::Inherited }; |
| self.print_associated_const(ti.ident, &ty, default, &vis); |
| } |
| hir::TraitItemKind::Fn(ref sig, hir::TraitFn::Required(ref arg_names)) => { |
| let vis = |
| Spanned { span: rustc_span::DUMMY_SP, node: hir::VisibilityKind::Inherited }; |
| self.print_method_sig(ti.ident, sig, &ti.generics, &vis, arg_names, None); |
| self.s.word(";"); |
| } |
| hir::TraitItemKind::Fn(ref sig, hir::TraitFn::Provided(body)) => { |
| let vis = |
| Spanned { span: rustc_span::DUMMY_SP, node: hir::VisibilityKind::Inherited }; |
| self.head(""); |
| self.print_method_sig(ti.ident, sig, &ti.generics, &vis, &[], Some(body)); |
| self.nbsp(); |
| self.end(); // need to close a box |
| self.end(); // need to close a box |
| self.ann.nested(self, Nested::Body(body)); |
| } |
| hir::TraitItemKind::Type(ref bounds, ref default) => { |
| self.print_associated_type( |
| ti.ident, |
| &ti.generics, |
| Some(bounds), |
| default.as_ref().map(|ty| &**ty), |
| ); |
| } |
| } |
| self.ann.post(self, AnnNode::SubItem(ti.hir_id())) |
| } |
| |
| pub 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_outer_attributes(self.attrs(ii.hir_id())); |
| self.print_defaultness(ii.defaultness); |
| |
| match ii.kind { |
| hir::ImplItemKind::Const(ref ty, expr) => { |
| self.print_associated_const(ii.ident, &ty, Some(expr), &ii.vis); |
| } |
| hir::ImplItemKind::Fn(ref sig, body) => { |
| self.head(""); |
| self.print_method_sig(ii.ident, sig, &ii.generics, &ii.vis, &[], Some(body)); |
| self.nbsp(); |
| self.end(); // need to close a box |
| self.end(); // need to close a box |
| self.ann.nested(self, Nested::Body(body)); |
| } |
| hir::ImplItemKind::TyAlias(ref ty) => { |
| self.print_associated_type(ii.ident, &ii.generics, None, Some(ty)); |
| } |
| } |
| self.ann.post(self, AnnNode::SubItem(ii.hir_id())) |
| } |
| |
| pub fn print_local(&mut self, init: Option<&hir::Expr<'_>>, decl: impl Fn(&mut Self)) { |
| self.space_if_not_bol(); |
| self.ibox(INDENT_UNIT); |
| self.word_nbsp("let"); |
| |
| self.ibox(INDENT_UNIT); |
| decl(self); |
| self.end(); |
| |
| if let Some(ref init) = init { |
| self.nbsp(); |
| self.word_space("="); |
| self.print_expr(&init); |
| } |
| self.end() |
| } |
| |
| pub fn print_stmt(&mut self, st: &hir::Stmt<'_>) { |
| self.maybe_print_comment(st.span.lo()); |
| match st.kind { |
| hir::StmtKind::Local(ref loc) => { |
| self.print_local(loc.init.as_deref(), |this| this.print_local_decl(&loc)); |
| } |
| hir::StmtKind::Item(item) => self.ann.nested(self, Nested::Item(item)), |
| hir::StmtKind::Expr(ref expr) => { |
| self.space_if_not_bol(); |
| self.print_expr(&expr); |
| } |
| hir::StmtKind::Semi(ref expr) => { |
| self.space_if_not_bol(); |
| self.print_expr(&expr); |
| self.s.word(";"); |
| } |
| } |
| if stmt_ends_with_semi(&st.kind) { |
| self.s.word(";"); |
| } |
| self.maybe_print_trailing_comment(st.span, None) |
| } |
| |
| pub fn print_block(&mut self, blk: &hir::Block<'_>) { |
| self.print_block_with_attrs(blk, &[]) |
| } |
| |
| pub fn print_block_unclosed(&mut self, blk: &hir::Block<'_>) { |
| self.print_block_maybe_unclosed(blk, &[], false) |
| } |
| |
| pub fn print_block_with_attrs(&mut self, blk: &hir::Block<'_>, attrs: &[ast::Attribute]) { |
| self.print_block_maybe_unclosed(blk, attrs, true) |
| } |
| |
| pub fn print_block_maybe_unclosed( |
| &mut self, |
| blk: &hir::Block<'_>, |
| attrs: &[ast::Attribute], |
| close_box: bool, |
| ) { |
| match blk.rules { |
| hir::BlockCheckMode::UnsafeBlock(..) => self.word_space("unsafe"), |
| hir::BlockCheckMode::PushUnsafeBlock(..) => self.word_space("push_unsafe"), |
| hir::BlockCheckMode::PopUnsafeBlock(..) => self.word_space("pop_unsafe"), |
| hir::BlockCheckMode::DefaultBlock => (), |
| } |
| self.maybe_print_comment(blk.span.lo()); |
| self.ann.pre(self, AnnNode::Block(blk)); |
| self.bopen(); |
| |
| self.print_inner_attributes(attrs); |
| |
| for st in blk.stmts { |
| self.print_stmt(st); |
| } |
| if let Some(ref 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, close_box); |
| self.ann.post(self, AnnNode::Block(blk)) |
| } |
| |
| fn print_else(&mut self, els: Option<&hir::Expr<'_>>) { |
| match els { |
| Some(else_) => { |
| match else_.kind { |
| // "another else-if" |
| hir::ExprKind::If(ref i, ref then, ref e) => { |
| self.cbox(INDENT_UNIT - 1); |
| self.ibox(0); |
| self.s.word(" else if "); |
| self.print_expr_as_cond(&i); |
| self.s.space(); |
| self.print_expr(&then); |
| self.print_else(e.as_ref().map(|e| &**e)) |
| } |
| // "final else" |
| hir::ExprKind::Block(ref b, _) => { |
| self.cbox(INDENT_UNIT - 1); |
| self.ibox(0); |
| self.s.word(" else "); |
| self.print_block(&b) |
| } |
| hir::ExprKind::Match(ref expr, arms, _) => { |
| // else if let desugared to match |
| assert!(arms.len() == 2, "if let desugars to match with two arms"); |
| |
| self.s.word(" else "); |
| self.s.word("{"); |
| |
| self.cbox(INDENT_UNIT); |
| self.ibox(INDENT_UNIT); |
| self.word_nbsp("match"); |
| self.print_expr_as_cond(&expr); |
| self.s.space(); |
| self.bopen(); |
| for arm in arms { |
| self.print_arm(arm); |
| } |
| self.bclose(expr.span); |
| |
| self.s.word("}"); |
| } |
| // BLEAH, constraints would be great here |
| _ => { |
| panic!("print_if saw if with weird alternative"); |
| } |
| } |
| } |
| _ => {} |
| } |
| } |
| |
| pub fn print_if( |
| &mut self, |
| test: &hir::Expr<'_>, |
| blk: &hir::Expr<'_>, |
| elseopt: Option<&hir::Expr<'_>>, |
| ) { |
| self.head("if"); |
| self.print_expr_as_cond(test); |
| self.s.space(); |
| self.print_expr(blk); |
| self.print_else(elseopt) |
| } |
| |
| pub fn print_anon_const(&mut self, constant: &hir::AnonConst) { |
| self.ann.nested(self, Nested::Body(constant.body)) |
| } |
| |
| fn print_call_post(&mut self, args: &[hir::Expr<'_>]) { |
| self.popen(); |
| self.commasep_exprs(Inconsistent, args); |
| self.pclose() |
| } |
| |
| pub fn print_expr_maybe_paren(&mut self, expr: &hir::Expr<'_>, prec: i8) { |
| let needs_par = expr.precedence().order() < prec; |
| if needs_par { |
| self.popen(); |
| } |
| self.print_expr(expr); |
| if needs_par { |
| self.pclose(); |
| } |
| } |
| |
| /// Print an expr using syntax that's acceptable in a condition position, such as the `cond` in |
| /// `if cond { ... }`. |
| pub fn print_expr_as_cond(&mut self, expr: &hir::Expr<'_>) { |
| let needs_par = match expr.kind { |
| // These cases need parens due to the parse error observed in #26461: `if return {}` |
| // parses as the erroneous construct `if (return {})`, not `if (return) {}`. |
| hir::ExprKind::Closure(..) | hir::ExprKind::Ret(..) | hir::ExprKind::Break(..) => true, |
| |
| _ => contains_exterior_struct_lit(expr), |
| }; |
| |
| if needs_par { |
| self.popen(); |
| } |
| self.print_expr(expr); |
| if needs_par { |
| self.pclose(); |
| } |
| } |
| |
| fn print_expr_vec(&mut self, exprs: &[hir::Expr<'_>]) { |
| self.ibox(INDENT_UNIT); |
| self.s.word("["); |
| self.commasep_exprs(Inconsistent, exprs); |
| self.s.word("]"); |
| self.end() |
| } |
| |
| fn print_expr_anon_const(&mut self, anon_const: &hir::AnonConst) { |
| self.ibox(INDENT_UNIT); |
| self.s.word_space("const"); |
| self.print_anon_const(anon_const); |
| self.end() |
| } |
| |
| fn print_expr_repeat(&mut self, element: &hir::Expr<'_>, count: &hir::AnonConst) { |
| self.ibox(INDENT_UNIT); |
| self.s.word("["); |
| self.print_expr(element); |
| self.word_space(";"); |
| self.print_anon_const(count); |
| self.s.word("]"); |
| self.end() |
| } |
| |
| fn print_expr_struct( |
| &mut self, |
| qpath: &hir::QPath<'_>, |
| fields: &[hir::ExprField<'_>], |
| wth: &Option<&hir::Expr<'_>>, |
| ) { |
| self.print_qpath(qpath, true); |
| self.s.word("{"); |
| self.commasep_cmnt( |
| Consistent, |
| fields, |
| |s, field| { |
| s.ibox(INDENT_UNIT); |
| if !field.is_shorthand { |
| s.print_ident(field.ident); |
| s.word_space(":"); |
| } |
| s.print_expr(&field.expr); |
| s.end() |
| }, |
| |f| f.span, |
| ); |
| match *wth { |
| Some(ref expr) => { |
| self.ibox(INDENT_UNIT); |
| if !fields.is_empty() { |
| self.s.word(","); |
| self.s.space(); |
| } |
| self.s.word(".."); |
| self.print_expr(&expr); |
| self.end(); |
| } |
| _ => { |
| if !fields.is_empty() { |
| self.s.word(",") |
| } |
| } |
| } |
| self.s.word("}"); |
| } |
| |
| fn print_expr_tup(&mut self, exprs: &[hir::Expr<'_>]) { |
| self.popen(); |
| self.commasep_exprs(Inconsistent, exprs); |
| if exprs.len() == 1 { |
| self.s.word(","); |
| } |
| self.pclose() |
| } |
| |
| fn print_expr_call(&mut self, func: &hir::Expr<'_>, args: &[hir::Expr<'_>]) { |
| let prec = match func.kind { |
| hir::ExprKind::Field(..) => parser::PREC_FORCE_PAREN, |
| _ => parser::PREC_POSTFIX, |
| }; |
| |
| self.print_expr_maybe_paren(func, prec); |
| self.print_call_post(args) |
| } |
| |
| fn print_expr_method_call(&mut self, segment: &hir::PathSegment<'_>, args: &[hir::Expr<'_>]) { |
| let base_args = &args[1..]; |
| self.print_expr_maybe_paren(&args[0], parser::PREC_POSTFIX); |
| self.s.word("."); |
| self.print_ident(segment.ident); |
| |
| let generic_args = segment.args(); |
| if !generic_args.args.is_empty() || !generic_args.bindings.is_empty() { |
| self.print_generic_args(generic_args, segment.infer_args, true); |
| } |
| |
| self.print_call_post(base_args) |
| } |
| |
| fn print_expr_binary(&mut self, op: hir::BinOp, lhs: &hir::Expr<'_>, rhs: &hir::Expr<'_>) { |
| let assoc_op = bin_op_to_assoc_op(op.node); |
| let prec = assoc_op.precedence() as i8; |
| let fixity = assoc_op.fixity(); |
| |
| let (left_prec, right_prec) = match fixity { |
| Fixity::Left => (prec, prec + 1), |
| Fixity::Right => (prec + 1, prec), |
| Fixity::None => (prec + 1, prec + 1), |
| }; |
| |
| let left_prec = match (&lhs.kind, op.node) { |
| // 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) => { |
| parser::PREC_FORCE_PAREN |
| } |
| _ => left_prec, |
| }; |
| |
| self.print_expr_maybe_paren(lhs, left_prec); |
| self.s.space(); |
| self.word_space(op.node.as_str()); |
| self.print_expr_maybe_paren(rhs, right_prec) |
| } |
| |
| fn print_expr_unary(&mut self, op: hir::UnOp, expr: &hir::Expr<'_>) { |
| self.s.word(op.as_str()); |
| self.print_expr_maybe_paren(expr, parser::PREC_PREFIX) |
| } |
| |
| fn print_expr_addr_of( |
| &mut self, |
| kind: hir::BorrowKind, |
| mutability: hir::Mutability, |
| expr: &hir::Expr<'_>, |
| ) { |
| self.s.word("&"); |
| match kind { |
| hir::BorrowKind::Ref => self.print_mutability(mutability, false), |
| hir::BorrowKind::Raw => { |
| self.word_nbsp("raw"); |
| self.print_mutability(mutability, true); |
| } |
| } |
| self.print_expr_maybe_paren(expr, parser::PREC_PREFIX) |
| } |
| |
| fn print_literal(&mut self, lit: &hir::Lit) { |
| self.maybe_print_comment(lit.span.lo()); |
| self.word(lit.node.to_lit_token().to_string()) |
| } |
| |
| pub fn print_expr(&mut self, expr: &hir::Expr<'_>) { |
| self.maybe_print_comment(expr.span.lo()); |
| self.print_outer_attributes(self.attrs(expr.hir_id)); |
| self.ibox(INDENT_UNIT); |
| self.ann.pre(self, AnnNode::Expr(expr)); |
| match expr.kind { |
| hir::ExprKind::Box(ref expr) => { |
| self.word_space("box"); |
| self.print_expr_maybe_paren(expr, parser::PREC_PREFIX); |
| } |
| hir::ExprKind::Array(ref exprs) => { |
| self.print_expr_vec(exprs); |
| } |
| hir::ExprKind::ConstBlock(ref anon_const) => { |
| self.print_expr_anon_const(anon_const); |
| } |
| hir::ExprKind::Repeat(ref element, ref count) => { |
| self.print_expr_repeat(&element, count); |
| } |
| hir::ExprKind::Struct(ref qpath, fields, ref wth) => { |
| self.print_expr_struct(qpath, fields, wth); |
| } |
| hir::ExprKind::Tup(ref exprs) => { |
| self.print_expr_tup(exprs); |
| } |
| hir::ExprKind::Call(ref func, ref args) => { |
| self.print_expr_call(&func, args); |
| } |
| hir::ExprKind::MethodCall(ref segment, _, ref args, _) => { |
| self.print_expr_method_call(segment, args); |
| } |
| hir::ExprKind::Binary(op, ref lhs, ref rhs) => { |
| self.print_expr_binary(op, &lhs, &rhs); |
| } |
| hir::ExprKind::Unary(op, ref expr) => { |
| self.print_expr_unary(op, &expr); |
| } |
| hir::ExprKind::AddrOf(k, m, ref expr) => { |
| self.print_expr_addr_of(k, m, &expr); |
| } |
| hir::ExprKind::Lit(ref lit) => { |
| self.print_literal(&lit); |
| } |
| hir::ExprKind::Cast(ref expr, ref ty) => { |
| let prec = AssocOp::As.precedence() as i8; |
| self.print_expr_maybe_paren(&expr, prec); |
| self.s.space(); |
| self.word_space("as"); |
| self.print_type(&ty); |
| } |
| hir::ExprKind::Type(ref expr, ref ty) => { |
| let prec = AssocOp::Colon.precedence() as i8; |
| self.print_expr_maybe_paren(&expr, prec); |
| self.word_space(":"); |
| self.print_type(&ty); |
| } |
| hir::ExprKind::DropTemps(ref init) => { |
| // Print `{`: |
| self.cbox(INDENT_UNIT); |
| self.ibox(0); |
| self.bopen(); |
| |
| // Print `let _t = $init;`: |
| let temp = Ident::from_str("_t"); |
| self.print_local(Some(init), |this| this.print_ident(temp)); |
| self.s.word(";"); |
| |
| // Print `_t`: |
| self.space_if_not_bol(); |
| self.print_ident(temp); |
| |
| // Print `}`: |
| self.bclose_maybe_open(expr.span, true); |
| } |
| hir::ExprKind::If(ref test, ref blk, ref elseopt) => { |
| self.print_if(&test, &blk, elseopt.as_ref().map(|e| &**e)); |
| } |
| hir::ExprKind::Loop(ref blk, opt_label, _, _) => { |
| if let Some(label) = opt_label { |
| self.print_ident(label.ident); |
| self.word_space(":"); |
| } |
| self.head("loop"); |
| self.s.space(); |
| self.print_block(&blk); |
| } |
| hir::ExprKind::Match(ref expr, arms, _) => { |
| self.cbox(INDENT_UNIT); |
| self.ibox(INDENT_UNIT); |
| self.word_nbsp("match"); |
| self.print_expr_as_cond(&expr); |
| self.s.space(); |
| self.bopen(); |
| for arm in arms { |
| self.print_arm(arm); |
| } |
| self.bclose(expr.span); |
| } |
| hir::ExprKind::Closure(capture_clause, ref decl, body, _fn_decl_span, _gen) => { |
| self.print_capture_clause(capture_clause); |
| |
| self.print_closure_params(&decl, body); |
| self.s.space(); |
| |
| // This is a bare expression. |
| self.ann.nested(self, Nested::Body(body)); |
| self.end(); // need to close a box |
| |
| // A box will be closed by `print_expr`, but we didn't want an overall |
| // wrapper so we closed the corresponding opening. so create an |
| // empty box to satisfy the close. |
| self.ibox(0); |
| } |
| hir::ExprKind::Block(ref 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 `}` |
| self.cbox(INDENT_UNIT); |
| // head-box, will be closed by print-block after `{` |
| self.ibox(0); |
| self.print_block(&blk); |
| } |
| hir::ExprKind::Assign(ref lhs, ref rhs, _) => { |
| let prec = AssocOp::Assign.precedence() as i8; |
| self.print_expr_maybe_paren(&lhs, prec + 1); |
| self.s.space(); |
| self.word_space("="); |
| self.print_expr_maybe_paren(&rhs, prec); |
| } |
| hir::ExprKind::AssignOp(op, ref lhs, ref rhs) => { |
| let prec = AssocOp::Assign.precedence() as i8; |
| self.print_expr_maybe_paren(&lhs, prec + 1); |
| self.s.space(); |
| self.s.word(op.node.as_str()); |
| self.word_space("="); |
| self.print_expr_maybe_paren(&rhs, prec); |
| } |
| hir::ExprKind::Field(ref expr, ident) => { |
| self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX); |
| self.s.word("."); |
| self.print_ident(ident); |
| } |
| hir::ExprKind::Index(ref expr, ref index) => { |
| self.print_expr_maybe_paren(&expr, parser::PREC_POSTFIX); |
| self.s.word("["); |
| self.print_expr(&index); |
| self.s.word("]"); |
| } |
| hir::ExprKind::Path(ref qpath) => self.print_qpath(qpath, true), |
| hir::ExprKind::Break(destination, ref opt_expr) => { |
| self.s.word("break"); |
| self.s.space(); |
| if let Some(label) = destination.label { |
| self.print_ident(label.ident); |
| self.s.space(); |
| } |
| if let Some(ref expr) = *opt_expr { |
| self.print_expr_maybe_paren(expr, parser::PREC_JUMP); |
| self.s.space(); |
| } |
| } |
| hir::ExprKind::Continue(destination) => { |
| self.s.word("continue"); |
| self.s.space(); |
| if let Some(label) = destination.label { |
| self.print_ident(label.ident); |
| self.s.space() |
| } |
| } |
| hir::ExprKind::Ret(ref result) => { |
| self.s.word("return"); |
| if let Some(ref expr) = *result { |
| self.s.word(" "); |
| self.print_expr_maybe_paren(&expr, parser::PREC_JUMP); |
| } |
| } |
| hir::ExprKind::InlineAsm(ref a) => { |
| enum AsmArg<'a> { |
| Template(String), |
| Operand(&'a hir::InlineAsmOperand<'a>), |
| Options(ast::InlineAsmOptions), |
| } |
| |
| let mut args = vec![]; |
| args.push(AsmArg::Template(ast::InlineAsmTemplatePiece::to_string(&a.template))); |
| args.extend(a.operands.iter().map(|(o, _)| AsmArg::Operand(o))); |
| if !a.options.is_empty() { |
| args.push(AsmArg::Options(a.options)); |
| } |
| |
| self.word("asm!"); |
| self.popen(); |
| self.commasep(Consistent, &args, |s, arg| match arg { |
| AsmArg::Template(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, 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, 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 { anon_const } => { |
| s.word("const"); |
| s.space(); |
| s.print_anon_const(anon_const); |
| } |
| hir::InlineAsmOperand::Sym { expr } => { |
| s.word("sym"); |
| s.space(); |
| s.print_expr(expr); |
| } |
| }, |
| AsmArg::Options(opts) => { |
| s.word("options"); |
| s.popen(); |
| let mut options = vec![]; |
| if opts.contains(ast::InlineAsmOptions::PURE) { |
| options.push("pure"); |
| } |
| if opts.contains(ast::InlineAsmOptions::NOMEM) { |
| options.push("nomem"); |
| } |
| if opts.contains(ast::InlineAsmOptions::READONLY) { |
| options.push("readonly"); |
| } |
| if opts.contains(ast::InlineAsmOptions::PRESERVES_FLAGS) { |
| options.push("preserves_flags"); |
| } |
| if opts.contains(ast::InlineAsmOptions::NORETURN) { |
| options.push("noreturn"); |
| } |
| if opts.contains(ast::InlineAsmOptions::NOSTACK) { |
| options.push("nostack"); |
| } |
| if opts.contains(ast::InlineAsmOptions::ATT_SYNTAX) { |
| options.push("att_syntax"); |
| } |
| s.commasep(Inconsistent, &options, |s, &opt| { |
| s.word(opt); |
| }); |
| s.pclose(); |
| } |
| }); |
| self.pclose(); |
| } |
| hir::ExprKind::LlvmInlineAsm(ref a) => { |
| let i = &a.inner; |
| self.s.word("llvm_asm!"); |
| self.popen(); |
| self.print_symbol(i.asm, i.asm_str_style); |
| self.word_space(":"); |
| |
| let mut out_idx = 0; |
| self.commasep(Inconsistent, &i.outputs, |s, out| { |
| let constraint = out.constraint.as_str(); |
| let mut ch = constraint.chars(); |
| match ch.next() { |
| Some('=') if out.is_rw => { |
| s.print_string(&format!("+{}", ch.as_str()), ast::StrStyle::Cooked) |
| } |
| _ => s.print_string(&constraint, ast::StrStyle::Cooked), |
| } |
| s.popen(); |
| s.print_expr(&a.outputs_exprs[out_idx]); |
| s.pclose(); |
| out_idx += 1; |
| }); |
| self.s.space(); |
| self.word_space(":"); |
| |
| let mut in_idx = 0; |
| self.commasep(Inconsistent, &i.inputs, |s, &co| { |
| s.print_symbol(co, ast::StrStyle::Cooked); |
| s.popen(); |
| s.print_expr(&a.inputs_exprs[in_idx]); |
| s.pclose(); |
| in_idx += 1; |
| }); |
| self.s.space(); |
| self.word_space(":"); |
| |
| self.commasep(Inconsistent, &i.clobbers, |s, &co| { |
| s.print_symbol(co, ast::StrStyle::Cooked); |
| }); |
| |
| let mut options = vec![]; |
| if i.volatile { |
| options.push("volatile"); |
| } |
| if i.alignstack { |
| options.push("alignstack"); |
| } |
| if i.dialect == ast::LlvmAsmDialect::Intel { |
| options.push("intel"); |
| } |
| |
| if !options.is_empty() { |
| self.s.space(); |
| self.word_space(":"); |
| self.commasep(Inconsistent, &options, |s, &co| { |
| s.print_string(co, ast::StrStyle::Cooked); |
| }); |
| } |
| |
| self.pclose(); |
| } |
| hir::ExprKind::Yield(ref expr, _) => { |
| self.word_space("yield"); |
| self.print_expr_maybe_paren(&expr, parser::PREC_JUMP); |
| } |
| hir::ExprKind::Err => { |
| self.popen(); |
| self.s.word("/*ERROR*/"); |
| self.pclose(); |
| } |
| } |
| self.ann.post(self, AnnNode::Expr(expr)); |
| self.end() |
| } |
| |
| pub fn print_local_decl(&mut self, loc: &hir::Local<'_>) { |
| self.print_pat(&loc.pat); |
| if let Some(ref ty) = loc.ty { |
| self.word_space(":"); |
| self.print_type(&ty); |
| } |
| } |
| |
| pub fn print_name(&mut self, name: Symbol) { |
| self.print_ident(Ident::with_dummy_span(name)) |
| } |
| |
| pub fn print_path(&mut self, path: &hir::Path<'_>, colons_before_params: bool) { |
| self.maybe_print_comment(path.span.lo()); |
| |
| for (i, segment) in path.segments.iter().enumerate() { |
| if i > 0 { |
| self.s.word("::") |
| } |
| if segment.ident.name != kw::PathRoot { |
| self.print_ident(segment.ident); |
| self.print_generic_args(segment.args(), segment.infer_args, colons_before_params); |
| } |
| } |
| } |
| |
| pub 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(), segment.infer_args, false); |
| } |
| } |
| |
| pub fn print_qpath(&mut self, qpath: &hir::QPath<'_>, colons_before_params: bool) { |
| match *qpath { |
| hir::QPath::Resolved(None, ref path) => self.print_path(path, colons_before_params), |
| hir::QPath::Resolved(Some(ref qself), ref path) => { |
| self.s.word("<"); |
| self.print_type(qself); |
| self.s.space(); |
| self.word_space("as"); |
| |
| for (i, segment) in path.segments[..path.segments.len() - 1].iter().enumerate() { |
| if i > 0 { |
| self.s.word("::") |
| } |
| if segment.ident.name != kw::PathRoot { |
| self.print_ident(segment.ident); |
| self.print_generic_args( |
| segment.args(), |
| segment.infer_args, |
| colons_before_params, |
| ); |
| } |
| } |
| |
| self.s.word(">"); |
| self.s.word("::"); |
| let item_segment = path.segments.last().unwrap(); |
| self.print_ident(item_segment.ident); |
| self.print_generic_args( |
| item_segment.args(), |
| item_segment.infer_args, |
| colons_before_params, |
| ) |
| } |
| hir::QPath::TypeRelative(ref qself, ref 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.s.word("<"); |
| self.print_type(qself); |
| self.s.word(">"); |
| } |
| |
| self.s.word("::"); |
| self.print_ident(item_segment.ident); |
| self.print_generic_args( |
| item_segment.args(), |
| item_segment.infer_args, |
| colons_before_params, |
| ) |
| } |
| hir::QPath::LangItem(lang_item, span) => { |
| self.s.word("#[lang = \""); |
| self.print_ident(Ident::new(lang_item.name(), span)); |
| self.s.word("\"]"); |
| } |
| } |
| } |
| |
| fn print_generic_args( |
| &mut self, |
| generic_args: &hir::GenericArgs<'_>, |
| infer_args: bool, |
| colons_before_params: bool, |
| ) { |
| if generic_args.parenthesized { |
| self.s.word("("); |
| self.commasep(Inconsistent, generic_args.inputs(), |s, ty| s.print_type(&ty)); |
| self.s.word(")"); |
| |
| self.space_if_not_bol(); |
| self.word_space("->"); |
| self.print_type(generic_args.bindings[0].ty()); |
| } else { |
| 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.s.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) => lt.is_elided(), |
| _ => { |
| nonelided_generic_args = true; |
| true |
| } |
| }); |
| |
| if nonelided_generic_args { |
| start_or_comma(self); |
| self.commasep( |
| Inconsistent, |
| &generic_args.args, |
| |s, generic_arg| match generic_arg { |
| GenericArg::Lifetime(lt) if !elide_lifetimes => s.print_lifetime(lt), |
| GenericArg::Lifetime(_) => {} |
| GenericArg::Type(ty) => s.print_type(ty), |
| GenericArg::Const(ct) => s.print_anon_const(&ct.value), |
| }, |
| ); |
| } |
| |
| // FIXME(eddyb): this would leak into error messages (e.g., |
| // "non-exhaustive patterns: `Some::<..>(_)` not covered"). |
| if infer_args && false { |
| start_or_comma(self); |
| self.s.word(".."); |
| } |
| |
| for binding in generic_args.bindings.iter() { |
| start_or_comma(self); |
| self.print_ident(binding.ident); |
| self.print_generic_args(binding.gen_args, false, false); |
| self.s.space(); |
| match generic_args.bindings[0].kind { |
| hir::TypeBindingKind::Equality { ref ty } => { |
| self.word_space("="); |
| self.print_type(ty); |
| } |
| hir::TypeBindingKind::Constraint { bounds } => { |
| self.print_bounds(":", bounds); |
| } |
| } |
| } |
| |
| if !empty.get() { |
| self.s.word(">") |
| } |
| } |
| } |
| |
| pub 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 { |
| PatKind::Wild => self.s.word("_"), |
| PatKind::Binding(binding_mode, _, ident, ref sub) => { |
| match binding_mode { |
| hir::BindingAnnotation::Ref => { |
| self.word_nbsp("ref"); |
| self.print_mutability(hir::Mutability::Not, false); |
| } |
| hir::BindingAnnotation::RefMut => { |
| self.word_nbsp("ref"); |
| self.print_mutability(hir::Mutability::Mut, false); |
| } |
| hir::BindingAnnotation::Unannotated => {} |
| hir::BindingAnnotation::Mutable => { |
| self.word_nbsp("mut"); |
| } |
| } |
| self.print_ident(ident); |
| if let Some(ref p) = *sub { |
| self.s.word("@"); |
| self.print_pat(&p); |
| } |
| } |
| PatKind::TupleStruct(ref qpath, ref elts, ddpos) => { |
| self.print_qpath(qpath, true); |
| self.popen(); |
| if let Some(ddpos) = ddpos { |
| self.commasep(Inconsistent, &elts[..ddpos], |s, p| s.print_pat(&p)); |
| if ddpos != 0 { |
| self.word_space(","); |
| } |
| self.s.word(".."); |
| if ddpos != elts.len() { |
| self.s.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::Path(ref qpath) => { |
| self.print_qpath(qpath, true); |
| } |
| PatKind::Struct(ref qpath, ref fields, etc) => { |
| self.print_qpath(qpath, true); |
| self.nbsp(); |
| self.word_space("{"); |
| self.commasep_cmnt( |
| Consistent, |
| &fields[..], |
| |s, f| { |
| s.cbox(INDENT_UNIT); |
| if !f.is_shorthand { |
| s.print_ident(f.ident); |
| s.word_nbsp(":"); |
| } |
| s.print_pat(&f.pat); |
| s.end() |
| }, |
| |f| f.pat.span, |
| ); |
| if etc { |
| if !fields.is_empty() { |
| self.word_space(","); |
| } |
| self.s.word(".."); |
| } |
| self.s.space(); |
| self.s.word("}"); |
| } |
| PatKind::Or(ref pats) => { |
| self.strsep("|", true, Inconsistent, &pats[..], |s, p| s.print_pat(&p)); |
| } |
| PatKind::Tuple(ref elts, ddpos) => { |
| self.popen(); |
| if let Some(ddpos) = ddpos { |
| self.commasep(Inconsistent, &elts[..ddpos], |s, p| s.print_pat(&p)); |
| if ddpos != 0 { |
| self.word_space(","); |
| } |
| self.s.word(".."); |
| if ddpos != elts.len() { |
| self.s.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.s.word(","); |
| } |
| } |
| self.pclose(); |
| } |
| PatKind::Box(ref inner) => { |
| let is_range_inner = matches!(inner.kind, PatKind::Range(..)); |
| self.s.word("box "); |
| if is_range_inner { |
| self.popen(); |
| } |
| self.print_pat(&inner); |
| if is_range_inner { |
| self.pclose(); |
| } |
| } |
| PatKind::Ref(ref inner, mutbl) => { |
| let is_range_inner = matches!(inner.kind, PatKind::Range(..)); |
| self.s.word("&"); |
| self.s.word(mutbl.prefix_str()); |
| if is_range_inner { |
| self.popen(); |
| } |
| self.print_pat(&inner); |
| if is_range_inner { |
| self.pclose(); |
| } |
| } |
| PatKind::Lit(ref e) => self.print_expr(&e), |
| PatKind::Range(ref begin, ref end, ref end_kind) => { |
| if let Some(expr) = begin { |
| self.print_expr(expr); |
| self.s.space(); |
| } |
| match *end_kind { |
| RangeEnd::Included => self.s.word("..."), |
| RangeEnd::Excluded => self.s.word(".."), |
| } |
| if let Some(expr) = end { |
| self.print_expr(expr); |
| } |
| } |
| PatKind::Slice(ref before, ref slice, ref after) => { |
| self.s.word("["); |
| self.commasep(Inconsistent, &before[..], |s, p| s.print_pat(&p)); |
| if let Some(ref p) = *slice { |
| if !before.is_empty() { |
| self.word_space(","); |
| } |
| if let PatKind::Wild = p.kind { |
| // Print nothing. |
| } else { |
| self.print_pat(&p); |
| } |
| self.s.word(".."); |
| if !after.is_empty() { |
| self.word_space(","); |
| } |
| } |
| self.commasep(Inconsistent, &after[..], |s, p| s.print_pat(&p)); |
| self.s.word("]"); |
| } |
| } |
| self.ann.post(self, AnnNode::Pat(pat)) |
| } |
| |
| pub fn print_param(&mut self, arg: &hir::Param<'_>) { |
| self.print_outer_attributes(self.attrs(arg.hir_id)); |
| self.print_pat(&arg.pat); |
| } |
| |
| pub 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.s.space(); |
| } |
| self.cbox(INDENT_UNIT); |
| self.ann.pre(self, AnnNode::Arm(arm)); |
| self.ibox(0); |
| self.print_outer_attributes(&self.attrs(arm.hir_id)); |
| self.print_pat(&arm.pat); |
| self.s.space(); |
| if let Some(ref g) = arm.guard { |
| match g { |
| hir::Guard::If(e) => { |
| self.word_space("if"); |
| self.print_expr(&e); |
| self.s.space(); |
| } |
| hir::Guard::IfLet(pat, e) => { |
| self.word_nbsp("if"); |
| self.word_nbsp("let"); |
| self.print_pat(&pat); |
| self.s.space(); |
| self.word_space("="); |
| self.print_expr(&e); |
| self.s.space(); |
| } |
| } |
| } |
| self.word_space("=>"); |
| |
| match arm.body.kind { |
| hir::ExprKind::Block(ref blk, opt_label) => { |
| if let Some(label) = opt_label { |
| self.print_ident(label.ident); |
| self.word_space(":"); |
| } |
| // the block will close the pattern's ibox |
| self.print_block_unclosed(&blk); |
| |
| // If it is a user-provided unsafe block, print a comma after it |
| if let hir::BlockCheckMode::UnsafeBlock(hir::UnsafeSource::UserProvided) = blk.rules |
| { |
| self.s.word(","); |
| } |
| } |
| _ => { |
| self.end(); // close the ibox for the pattern |
| self.print_expr(&arm.body); |
| self.s.word(","); |
| } |
| } |
| self.ann.post(self, AnnNode::Arm(arm)); |
| self.end() // close enclosing cbox |
| } |
| |
| pub fn print_fn( |
| &mut self, |
| decl: &hir::FnDecl<'_>, |
| header: hir::FnHeader, |
| name: Option<Symbol>, |
| generics: &hir::Generics<'_>, |
| vis: &hir::Visibility<'_>, |
| arg_names: &[Ident], |
| body_id: Option<hir::BodyId>, |
| ) { |
| self.print_fn_header_info(header, vis); |
| |
| if let Some(name) = name { |
| self.nbsp(); |
| self.print_name(name); |
| } |
| self.print_generic_params(&generics.params); |
| |
| self.popen(); |
| let mut i = 0; |
| // Make sure we aren't supplied *both* `arg_names` and `body_id`. |
| assert!(arg_names.is_empty() || body_id.is_none()); |
| self.commasep(Inconsistent, &decl.inputs, |s, ty| { |
| s.ibox(INDENT_UNIT); |
| if let Some(arg_name) = arg_names.get(i) { |
| s.s.word(arg_name.to_string()); |
| s.s.word(":"); |
| s.s.space(); |
| } else if let Some(body_id) = body_id { |
| s.ann.nested(s, Nested::BodyParamPat(body_id, i)); |
| s.s.word(":"); |
| s.s.space(); |
| } |
| i += 1; |
| s.print_type(ty); |
| s.end() |
| }); |
| if decl.c_variadic { |
| self.s.word(", ..."); |
| } |
| self.pclose(); |
| |
| self.print_fn_output(decl); |
| self.print_where_clause(&generics.where_clause) |
| } |
| |
| fn print_closure_params(&mut self, decl: &hir::FnDecl<'_>, body_id: hir::BodyId) { |
| self.s.word("|"); |
| let mut i = 0; |
| self.commasep(Inconsistent, &decl.inputs, |s, ty| { |
| 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.s.word(":"); |
| s.s.space(); |
| s.print_type(ty); |
| } |
| s.end(); |
| }); |
| self.s.word("|"); |
| |
| if let hir::FnRetTy::DefaultReturn(..) = decl.output { |
| return; |
| } |
| |
| self.space_if_not_bol(); |
| self.word_space("->"); |
| match decl.output { |
| hir::FnRetTy::Return(ref ty) => { |
| self.print_type(&ty); |
| self.maybe_print_comment(ty.span.lo()) |
| } |
| hir::FnRetTy::DefaultReturn(..) => unreachable!(), |
| } |
| } |
| |
| pub fn print_capture_clause(&mut self, capture_clause: hir::CaptureBy) { |
| match capture_clause { |
| hir::CaptureBy::Value => self.word_space("move"), |
| hir::CaptureBy::Ref => {} |
| } |
| } |
| |
| pub 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.s.word(prefix); |
| } |
| if !(first && prefix.is_empty()) { |
| self.nbsp(); |
| } |
| if first { |
| first = false; |
| } else { |
| self.word_space("+"); |
| } |
| |
| match bound { |
| GenericBound::Trait(tref, modifier) => { |
| if modifier == &TraitBoundModifier::Maybe { |
| self.s.word("?"); |
| } |
| self.print_poly_trait_ref(tref); |
| } |
| GenericBound::LangItemTrait(lang_item, span, ..) => { |
| self.s.word("#[lang = \""); |
| self.print_ident(Ident::new(lang_item.name(), *span)); |
| self.s.word("\"]"); |
| } |
| GenericBound::Outlives(lt) => { |
| self.print_lifetime(lt); |
| } |
| } |
| } |
| } |
| |
| pub fn print_generic_params(&mut self, generic_params: &[GenericParam<'_>]) { |
| if !generic_params.is_empty() { |
| self.s.word("<"); |
| |
| self.commasep(Inconsistent, generic_params, |s, param| s.print_generic_param(param)); |
| |
| self.s.word(">"); |
| } |
| } |
| |
| pub 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 { .. } => { |
| let mut sep = ":"; |
| for bound in param.bounds { |
| match bound { |
| GenericBound::Outlives(ref lt) => { |
| self.s.word(sep); |
| self.print_lifetime(lt); |
| sep = "+"; |
| } |
| _ => panic!(), |
| } |
| } |
| } |
| GenericParamKind::Type { ref default, .. } => { |
| self.print_bounds(":", param.bounds); |
| if let Some(default) = default { |
| self.s.space(); |
| self.word_space("="); |
| self.print_type(&default) |
| } |
| } |
| GenericParamKind::Const { ref ty, ref default } => { |
| self.word_space(":"); |
| self.print_type(ty); |
| if let Some(ref default) = default { |
| self.s.space(); |
| self.word_space("="); |
| self.print_anon_const(&default) |
| } |
| } |
| } |
| } |
| |
| pub fn print_lifetime(&mut self, lifetime: &hir::Lifetime) { |
| self.print_ident(lifetime.name.ident()) |
| } |
| |
| pub fn print_where_clause(&mut self, where_clause: &hir::WhereClause<'_>) { |
| if where_clause.predicates.is_empty() { |
| return; |
| } |
| |
| self.s.space(); |
| self.word_space("where"); |
| |
| for (i, predicate) in where_clause.predicates.iter().enumerate() { |
| if i != 0 { |
| self.word_space(","); |
| } |
| |
| match predicate { |
| hir::WherePredicate::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::WherePredicate::RegionPredicate(hir::WhereRegionPredicate { |
| lifetime, |
| bounds, |
| .. |
| }) => { |
| self.print_lifetime(lifetime); |
| self.s.word(":"); |
| |
| for (i, bound) in bounds.iter().enumerate() { |
| match bound { |
| GenericBound::Outlives(lt) => { |
| self.print_lifetime(lt); |
| } |
| _ => panic!(), |
| } |
| |
| if i != 0 { |
| self.s.word(":"); |
| } |
| } |
| } |
| hir::WherePredicate::EqPredicate(hir::WhereEqPredicate { |
| lhs_ty, rhs_ty, .. |
| }) => { |
| self.print_type(lhs_ty); |
| self.s.space(); |
| self.word_space("="); |
| self.print_type(rhs_ty); |
| } |
| } |
| } |
| } |
| |
| pub 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") |
| } |
| } |
| } |
| } |
| |
| pub fn print_mt(&mut self, mt: &hir::MutTy<'_>, print_const: bool) { |
| self.print_mutability(mt.mutbl, print_const); |
| self.print_type(&mt.ty) |
| } |
| |
| pub fn print_fn_output(&mut self, decl: &hir::FnDecl<'_>) { |
| if let hir::FnRetTy::DefaultReturn(..) = decl.output { |
| return; |
| } |
| |
| self.space_if_not_bol(); |
| self.ibox(INDENT_UNIT); |
| self.word_space("->"); |
| match decl.output { |
| hir::FnRetTy::DefaultReturn(..) => unreachable!(), |
| hir::FnRetTy::Return(ref ty) => self.print_type(&ty), |
| } |
| self.end(); |
| |
| if let hir::FnRetTy::Return(ref output) = decl.output { |
| self.maybe_print_comment(output.span.lo()) |
| } |
| } |
| |
| pub fn print_ty_fn( |
| &mut self, |
| abi: Abi, |
| unsafety: hir::Unsafety, |
| decl: &hir::FnDecl<'_>, |
| name: Option<Symbol>, |
| generic_params: &[hir::GenericParam<'_>], |
| arg_names: &[Ident], |
| ) { |
| self.ibox(INDENT_UNIT); |
| if !generic_params.is_empty() { |
| self.s.word("for"); |
| self.print_generic_params(generic_params); |
| } |
| let generics = hir::Generics { |
| params: &[], |
| where_clause: hir::WhereClause { predicates: &[], span: rustc_span::DUMMY_SP }, |
| span: rustc_span::DUMMY_SP, |
| }; |
| self.print_fn( |
| decl, |
| hir::FnHeader { |
| unsafety, |
| abi, |
| constness: hir::Constness::NotConst, |
| asyncness: hir::IsAsync::NotAsync, |
| }, |
| name, |
| &generics, |
| &Spanned { span: rustc_span::DUMMY_SP, node: hir::VisibilityKind::Inherited }, |
| arg_names, |
| None, |
| ); |
| self.end(); |
| } |
| |
| pub fn maybe_print_trailing_comment( |
| &mut self, |
| span: rustc_span::Span, |
| next_pos: Option<BytePos>, |
| ) { |
| if let Some(cmnts) = self.comments() { |
| if let Some(cmnt) = cmnts.trailing_comment(span, next_pos) { |
| self.print_comment(&cmnt); |
| } |
| } |
| } |
| |
| pub fn print_remaining_comments(&mut self) { |
| // If there aren't any remaining comments, then we need to manually |
| // make sure there is a line break at the end. |
| if self.next_comment().is_none() { |
| self.s.hardbreak(); |
| } |
| while let Some(ref cmnt) = self.next_comment() { |
| self.print_comment(cmnt) |
| } |
| } |
| |
| pub fn print_fn_header_info(&mut self, header: hir::FnHeader, vis: &hir::Visibility<'_>) { |
| self.s.word(visibility_qualified(vis, "")); |
| |
| match header.constness { |
| hir::Constness::NotConst => {} |
| hir::Constness::Const => self.word_nbsp("const"), |
| } |
| |
| match header.asyncness { |
| hir::IsAsync::NotAsync => {} |
| hir::IsAsync::Async => self.word_nbsp("async"), |
| } |
| |
| self.print_unsafety(header.unsafety); |
| |
| if header.abi != Abi::Rust { |
| self.word_nbsp("extern"); |
| self.word_nbsp(header.abi.to_string()); |
| } |
| |
| self.s.word("fn") |
| } |
| |
| pub fn print_unsafety(&mut self, s: hir::Unsafety) { |
| match s { |
| hir::Unsafety::Normal => {} |
| hir::Unsafety::Unsafe => self.word_nbsp("unsafe"), |
| } |
| } |
| |
| pub 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::Local(_) => true, |
| hir::StmtKind::Item(_) => false, |
| hir::StmtKind::Expr(ref e) => expr_requires_semi_to_be_stmt(&e), |
| hir::StmtKind::Semi(..) => false, |
| } |
| } |
| |
| fn bin_op_to_assoc_op(op: hir::BinOpKind) -> AssocOp { |
| use crate::hir::BinOpKind::*; |
| match op { |
| Add => AssocOp::Add, |
| Sub => AssocOp::Subtract, |
| Mul => AssocOp::Multiply, |
| Div => AssocOp::Divide, |
| Rem => AssocOp::Modulus, |
| |
| And => AssocOp::LAnd, |
| Or => AssocOp::LOr, |
| |
| BitXor => AssocOp::BitXor, |
| BitAnd => AssocOp::BitAnd, |
| BitOr => AssocOp::BitOr, |
| Shl => AssocOp::ShiftLeft, |
| Shr => AssocOp::ShiftRight, |
| |
| Eq => AssocOp::Equal, |
| Lt => AssocOp::Less, |
| Le => AssocOp::LessEqual, |
| Ne => AssocOp::NotEqual, |
| Ge => AssocOp::GreaterEqual, |
| Gt => AssocOp::Greater, |
| } |
| } |
| |
| /// 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(ref lhs, ref rhs, _) |
| | hir::ExprKind::AssignOp(_, ref lhs, ref rhs) |
| | hir::ExprKind::Binary(_, ref lhs, ref rhs) => { |
| // `X { y: 1 } + X { y: 2 }` |
| contains_exterior_struct_lit(&lhs) || contains_exterior_struct_lit(&rhs) |
| } |
| hir::ExprKind::Unary(_, ref x) |
| | hir::ExprKind::Cast(ref x, _) |
| | hir::ExprKind::Type(ref x, _) |
| | hir::ExprKind::Field(ref x, _) |
| | hir::ExprKind::Index(ref x, _) => { |
| // `&X { y: 1 }, X { y: 1 }.y` |
| contains_exterior_struct_lit(&x) |
| } |
| |
| hir::ExprKind::MethodCall(.., ref exprs, _) => { |
| // `X { y: 1 }.bar(...)` |
| contains_exterior_struct_lit(&exprs[0]) |
| } |
| |
| _ => false, |
| } |
| } |
