| use crate::pp::Breaks::Inconsistent; |
| use crate::pprust::state::fixup::FixupContext; |
| use crate::pprust::state::{AnnNode, PrintState, State, INDENT_UNIT}; |
| |
| use ast::StaticItem; |
| use itertools::{Itertools, Position}; |
| use rustc_ast as ast; |
| use rustc_ast::ptr::P; |
| use rustc_ast::ModKind; |
| use rustc_span::symbol::Ident; |
| |
| fn visibility_qualified(vis: &ast::Visibility, s: &str) -> String { |
| format!("{}{}", State::to_string(|s| s.print_visibility(vis)), s) |
| } |
| |
| impl<'a> State<'a> { |
| fn print_foreign_mod(&mut self, nmod: &ast::ForeignMod, attrs: &[ast::Attribute]) { |
| self.print_inner_attributes(attrs); |
| for item in &nmod.items { |
| self.print_foreign_item(item); |
| } |
| } |
| |
| fn print_foreign_item(&mut self, item: &ast::ForeignItem) { |
| let ast::Item { id, span, ident, ref attrs, ref kind, ref vis, tokens: _ } = *item; |
| self.ann.pre(self, AnnNode::SubItem(id)); |
| self.hardbreak_if_not_bol(); |
| self.maybe_print_comment(span.lo()); |
| self.print_outer_attributes(attrs); |
| match kind { |
| ast::ForeignItemKind::Fn(box ast::Fn { defaultness, sig, generics, body }) => { |
| self.print_fn_full(sig, ident, generics, vis, *defaultness, body.as_deref(), attrs); |
| } |
| ast::ForeignItemKind::Static(box ast::StaticForeignItem { ty, mutability, expr }) => { |
| self.print_item_const( |
| ident, |
| Some(*mutability), |
| &ast::Generics::default(), |
| ty, |
| expr.as_deref(), |
| vis, |
| ast::Defaultness::Final, |
| ) |
| } |
| ast::ForeignItemKind::TyAlias(box ast::TyAlias { |
| defaultness, |
| generics, |
| where_clauses, |
| bounds, |
| ty, |
| }) => { |
| self.print_associated_type( |
| ident, |
| generics, |
| *where_clauses, |
| bounds, |
| ty.as_deref(), |
| vis, |
| *defaultness, |
| ); |
| } |
| ast::ForeignItemKind::MacCall(m) => { |
| self.print_mac(m); |
| if m.args.need_semicolon() { |
| self.word(";"); |
| } |
| } |
| } |
| self.ann.post(self, AnnNode::SubItem(id)) |
| } |
| |
| fn print_item_const( |
| &mut self, |
| ident: Ident, |
| mutbl: Option<ast::Mutability>, |
| generics: &ast::Generics, |
| ty: &ast::Ty, |
| body: Option<&ast::Expr>, |
| vis: &ast::Visibility, |
| defaultness: ast::Defaultness, |
| ) { |
| self.head(""); |
| self.print_visibility(vis); |
| self.print_defaultness(defaultness); |
| let leading = match mutbl { |
| None => "const", |
| Some(ast::Mutability::Not) => "static", |
| Some(ast::Mutability::Mut) => "static mut", |
| }; |
| self.word_space(leading); |
| self.print_ident(ident); |
| self.print_generic_params(&generics.params); |
| self.word_space(":"); |
| self.print_type(ty); |
| if body.is_some() { |
| self.space(); |
| } |
| self.end(); // end the head-ibox |
| if let Some(body) = body { |
| self.word_space("="); |
| self.print_expr(body, FixupContext::default()); |
| } |
| self.print_where_clause(&generics.where_clause); |
| self.word(";"); |
| self.end(); // end the outer cbox |
| } |
| |
| fn print_associated_type( |
| &mut self, |
| ident: Ident, |
| generics: &ast::Generics, |
| where_clauses: ast::TyAliasWhereClauses, |
| bounds: &ast::GenericBounds, |
| ty: Option<&ast::Ty>, |
| vis: &ast::Visibility, |
| defaultness: ast::Defaultness, |
| ) { |
| let (before_predicates, after_predicates) = |
| generics.where_clause.predicates.split_at(where_clauses.split); |
| self.head(""); |
| self.print_visibility(vis); |
| self.print_defaultness(defaultness); |
| self.word_space("type"); |
| self.print_ident(ident); |
| self.print_generic_params(&generics.params); |
| if !bounds.is_empty() { |
| self.word_nbsp(":"); |
| self.print_type_bounds(bounds); |
| } |
| self.print_where_clause_parts(where_clauses.before.has_where_token, before_predicates); |
| if let Some(ty) = ty { |
| self.space(); |
| self.word_space("="); |
| self.print_type(ty); |
| } |
| self.print_where_clause_parts(where_clauses.after.has_where_token, after_predicates); |
| self.word(";"); |
| self.end(); // end inner head-block |
| self.end(); // end outer head-block |
| } |
| |
| /// Pretty-prints an item. |
| pub(crate) fn print_item(&mut self, item: &ast::Item) { |
| self.hardbreak_if_not_bol(); |
| self.maybe_print_comment(item.span.lo()); |
| self.print_outer_attributes(&item.attrs); |
| self.ann.pre(self, AnnNode::Item(item)); |
| match &item.kind { |
| ast::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.space(); |
| self.word("as"); |
| self.space(); |
| } |
| self.print_ident(item.ident); |
| self.word(";"); |
| self.end(); // end inner head-block |
| self.end(); // end outer head-block |
| } |
| ast::ItemKind::Use(tree) => { |
| self.print_visibility(&item.vis); |
| self.word_nbsp("use"); |
| self.print_use_tree(tree); |
| self.word(";"); |
| } |
| ast::ItemKind::Static(box StaticItem { ty, mutability: mutbl, expr: body }) => { |
| self.print_item_const( |
| item.ident, |
| Some(*mutbl), |
| &ast::Generics::default(), |
| ty, |
| body.as_deref(), |
| &item.vis, |
| ast::Defaultness::Final, |
| ); |
| } |
| ast::ItemKind::Const(box ast::ConstItem { defaultness, generics, ty, expr }) => { |
| self.print_item_const( |
| item.ident, |
| None, |
| generics, |
| ty, |
| expr.as_deref(), |
| &item.vis, |
| *defaultness, |
| ); |
| } |
| ast::ItemKind::Fn(box ast::Fn { defaultness, sig, generics, body }) => { |
| self.print_fn_full( |
| sig, |
| item.ident, |
| generics, |
| &item.vis, |
| *defaultness, |
| body.as_deref(), |
| &item.attrs, |
| ); |
| } |
| ast::ItemKind::Mod(unsafety, mod_kind) => { |
| self.head(Self::to_string(|s| { |
| s.print_visibility(&item.vis); |
| s.print_unsafety(*unsafety); |
| s.word("mod"); |
| })); |
| self.print_ident(item.ident); |
| |
| match mod_kind { |
| ModKind::Loaded(items, ..) => { |
| self.nbsp(); |
| self.bopen(); |
| self.print_inner_attributes(&item.attrs); |
| for item in items { |
| self.print_item(item); |
| } |
| let empty = item.attrs.is_empty() && items.is_empty(); |
| self.bclose(item.span, empty); |
| } |
| ModKind::Unloaded => { |
| self.word(";"); |
| self.end(); // end inner head-block |
| self.end(); // end outer head-block |
| } |
| } |
| } |
| ast::ItemKind::ForeignMod(nmod) => { |
| self.head(Self::to_string(|s| { |
| s.print_unsafety(nmod.unsafety); |
| s.word("extern"); |
| })); |
| if let Some(abi) = nmod.abi { |
| self.print_token_literal(abi.as_token_lit(), abi.span); |
| self.nbsp(); |
| } |
| self.bopen(); |
| self.print_foreign_mod(nmod, &item.attrs); |
| let empty = item.attrs.is_empty() && nmod.items.is_empty(); |
| self.bclose(item.span, empty); |
| } |
| ast::ItemKind::GlobalAsm(asm) => { |
| // FIXME: Print `builtin # global_asm` once macro `global_asm` uses `builtin_syntax`. |
| self.head(visibility_qualified(&item.vis, "global_asm!")); |
| self.print_inline_asm(asm); |
| self.word(";"); |
| self.end(); |
| self.end(); |
| } |
| ast::ItemKind::TyAlias(box ast::TyAlias { |
| defaultness, |
| generics, |
| where_clauses, |
| bounds, |
| ty, |
| }) => { |
| self.print_associated_type( |
| item.ident, |
| generics, |
| *where_clauses, |
| bounds, |
| ty.as_deref(), |
| &item.vis, |
| *defaultness, |
| ); |
| } |
| ast::ItemKind::Enum(enum_definition, params) => { |
| self.print_enum_def(enum_definition, params, item.ident, item.span, &item.vis); |
| } |
| ast::ItemKind::Struct(struct_def, generics) => { |
| self.head(visibility_qualified(&item.vis, "struct")); |
| self.print_struct(struct_def, generics, item.ident, item.span, true); |
| } |
| ast::ItemKind::Union(struct_def, generics) => { |
| self.head(visibility_qualified(&item.vis, "union")); |
| self.print_struct(struct_def, generics, item.ident, item.span, true); |
| } |
| ast::ItemKind::Impl(box ast::Impl { |
| unsafety, |
| polarity, |
| defaultness, |
| constness, |
| generics, |
| of_trait, |
| self_ty, |
| items, |
| }) => { |
| self.head(""); |
| self.print_visibility(&item.vis); |
| self.print_defaultness(*defaultness); |
| self.print_unsafety(*unsafety); |
| self.word("impl"); |
| |
| if generics.params.is_empty() { |
| self.nbsp(); |
| } else { |
| self.print_generic_params(&generics.params); |
| self.space(); |
| } |
| |
| self.print_constness(*constness); |
| |
| if let ast::ImplPolarity::Negative(_) = polarity { |
| self.word("!"); |
| } |
| |
| if let Some(t) = of_trait { |
| self.print_trait_ref(t); |
| self.space(); |
| self.word_space("for"); |
| } |
| |
| self.print_type(self_ty); |
| self.print_where_clause(&generics.where_clause); |
| |
| self.space(); |
| self.bopen(); |
| self.print_inner_attributes(&item.attrs); |
| for impl_item in items { |
| self.print_assoc_item(impl_item); |
| } |
| let empty = item.attrs.is_empty() && items.is_empty(); |
| self.bclose(item.span, empty); |
| } |
| ast::ItemKind::Trait(box ast::Trait { |
| is_auto, |
| unsafety, |
| generics, |
| bounds, |
| items, |
| .. |
| }) => { |
| self.head(""); |
| self.print_visibility(&item.vis); |
| self.print_unsafety(*unsafety); |
| self.print_is_auto(*is_auto); |
| self.word_nbsp("trait"); |
| self.print_ident(item.ident); |
| self.print_generic_params(&generics.params); |
| if !bounds.is_empty() { |
| self.word_nbsp(":"); |
| self.print_type_bounds(bounds); |
| } |
| self.print_where_clause(&generics.where_clause); |
| self.word(" "); |
| self.bopen(); |
| self.print_inner_attributes(&item.attrs); |
| for trait_item in items { |
| self.print_assoc_item(trait_item); |
| } |
| let empty = item.attrs.is_empty() && items.is_empty(); |
| self.bclose(item.span, empty); |
| } |
| ast::ItemKind::TraitAlias(generics, bounds) => { |
| self.head(visibility_qualified(&item.vis, "trait")); |
| self.print_ident(item.ident); |
| self.print_generic_params(&generics.params); |
| self.nbsp(); |
| if !bounds.is_empty() { |
| self.word_nbsp("="); |
| self.print_type_bounds(bounds); |
| } |
| self.print_where_clause(&generics.where_clause); |
| self.word(";"); |
| self.end(); // end inner head-block |
| self.end(); // end outer head-block |
| } |
| ast::ItemKind::MacCall(mac) => { |
| self.print_mac(mac); |
| if mac.args.need_semicolon() { |
| self.word(";"); |
| } |
| } |
| ast::ItemKind::MacroDef(macro_def) => { |
| self.print_mac_def(macro_def, &item.ident, item.span, |state| { |
| state.print_visibility(&item.vis) |
| }); |
| } |
| ast::ItemKind::Delegation(deleg) => self.print_delegation( |
| &item.attrs, |
| &item.vis, |
| &deleg.qself, |
| &deleg.path, |
| None, |
| &deleg.body, |
| ), |
| ast::ItemKind::DelegationMac(deleg) => self.print_delegation( |
| &item.attrs, |
| &item.vis, |
| &deleg.qself, |
| &deleg.prefix, |
| Some(&deleg.suffixes), |
| &deleg.body, |
| ), |
| } |
| self.ann.post(self, AnnNode::Item(item)) |
| } |
| |
| fn print_enum_def( |
| &mut self, |
| enum_definition: &ast::EnumDef, |
| generics: &ast::Generics, |
| ident: Ident, |
| span: rustc_span::Span, |
| visibility: &ast::Visibility, |
| ) { |
| self.head(visibility_qualified(visibility, "enum")); |
| self.print_ident(ident); |
| self.print_generic_params(&generics.params); |
| self.print_where_clause(&generics.where_clause); |
| self.space(); |
| self.print_variants(&enum_definition.variants, span) |
| } |
| |
| fn print_variants(&mut self, variants: &[ast::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(&v.attrs); |
| self.ibox(0); |
| self.print_variant(v); |
| self.word(","); |
| self.end(); |
| self.maybe_print_trailing_comment(v.span, None); |
| } |
| let empty = variants.is_empty(); |
| self.bclose(span, empty) |
| } |
| |
| pub(crate) fn print_visibility(&mut self, vis: &ast::Visibility) { |
| match &vis.kind { |
| ast::VisibilityKind::Public => self.word_nbsp("pub"), |
| ast::VisibilityKind::Restricted { path, shorthand, .. } => { |
| let path = Self::to_string(|s| s.print_path(path, false, 0)); |
| if *shorthand && (path == "crate" || path == "self" || path == "super") { |
| self.word_nbsp(format!("pub({path})")) |
| } else { |
| self.word_nbsp(format!("pub(in {path})")) |
| } |
| } |
| ast::VisibilityKind::Inherited => {} |
| } |
| } |
| |
| fn print_defaultness(&mut self, defaultness: ast::Defaultness) { |
| if let ast::Defaultness::Default(_) = defaultness { |
| self.word_nbsp("default"); |
| } |
| } |
| |
| pub(crate) fn print_record_struct_body( |
| &mut self, |
| fields: &[ast::FieldDef], |
| span: rustc_span::Span, |
| ) { |
| self.nbsp(); |
| self.bopen(); |
| |
| let empty = fields.is_empty(); |
| if !empty { |
| self.hardbreak_if_not_bol(); |
| |
| for field in fields { |
| self.hardbreak_if_not_bol(); |
| self.maybe_print_comment(field.span.lo()); |
| self.print_outer_attributes(&field.attrs); |
| self.print_visibility(&field.vis); |
| self.print_ident(field.ident.unwrap()); |
| self.word_nbsp(":"); |
| self.print_type(&field.ty); |
| self.word(","); |
| } |
| } |
| |
| self.bclose(span, empty); |
| } |
| |
| fn print_struct( |
| &mut self, |
| struct_def: &ast::VariantData, |
| generics: &ast::Generics, |
| ident: Ident, |
| span: rustc_span::Span, |
| print_finalizer: bool, |
| ) { |
| self.print_ident(ident); |
| self.print_generic_params(&generics.params); |
| match &struct_def { |
| ast::VariantData::Tuple(..) | ast::VariantData::Unit(..) => { |
| if let ast::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(&field.attrs); |
| s.print_visibility(&field.vis); |
| s.print_type(&field.ty) |
| }); |
| self.pclose(); |
| } |
| self.print_where_clause(&generics.where_clause); |
| if print_finalizer { |
| self.word(";"); |
| } |
| self.end(); |
| self.end(); // Close the outer-box. |
| } |
| ast::VariantData::Struct { fields, .. } => { |
| self.print_where_clause(&generics.where_clause); |
| self.print_record_struct_body(fields, span); |
| } |
| } |
| } |
| |
| pub(crate) fn print_variant(&mut self, v: &ast::Variant) { |
| self.head(""); |
| self.print_visibility(&v.vis); |
| let generics = ast::Generics::default(); |
| self.print_struct(&v.data, &generics, v.ident, v.span, false); |
| if let Some(d) = &v.disr_expr { |
| self.space(); |
| self.word_space("="); |
| self.print_expr(&d.value, FixupContext::default()) |
| } |
| } |
| |
| fn print_assoc_item(&mut self, item: &ast::AssocItem) { |
| let ast::Item { id, span, ident, ref attrs, ref kind, ref vis, tokens: _ } = *item; |
| self.ann.pre(self, AnnNode::SubItem(id)); |
| self.hardbreak_if_not_bol(); |
| self.maybe_print_comment(span.lo()); |
| self.print_outer_attributes(attrs); |
| match kind { |
| ast::AssocItemKind::Fn(box ast::Fn { defaultness, sig, generics, body }) => { |
| self.print_fn_full(sig, ident, generics, vis, *defaultness, body.as_deref(), attrs); |
| } |
| ast::AssocItemKind::Const(box ast::ConstItem { defaultness, generics, ty, expr }) => { |
| self.print_item_const( |
| ident, |
| None, |
| generics, |
| ty, |
| expr.as_deref(), |
| vis, |
| *defaultness, |
| ); |
| } |
| ast::AssocItemKind::Type(box ast::TyAlias { |
| defaultness, |
| generics, |
| where_clauses, |
| bounds, |
| ty, |
| }) => { |
| self.print_associated_type( |
| ident, |
| generics, |
| *where_clauses, |
| bounds, |
| ty.as_deref(), |
| vis, |
| *defaultness, |
| ); |
| } |
| ast::AssocItemKind::MacCall(m) => { |
| self.print_mac(m); |
| if m.args.need_semicolon() { |
| self.word(";"); |
| } |
| } |
| ast::AssocItemKind::Delegation(deleg) => self.print_delegation( |
| &item.attrs, |
| vis, |
| &deleg.qself, |
| &deleg.path, |
| None, |
| &deleg.body, |
| ), |
| ast::AssocItemKind::DelegationMac(deleg) => self.print_delegation( |
| &item.attrs, |
| vis, |
| &deleg.qself, |
| &deleg.prefix, |
| Some(&deleg.suffixes), |
| &deleg.body, |
| ), |
| } |
| self.ann.post(self, AnnNode::SubItem(id)) |
| } |
| |
| pub(crate) fn print_delegation( |
| &mut self, |
| attrs: &[ast::Attribute], |
| vis: &ast::Visibility, |
| qself: &Option<P<ast::QSelf>>, |
| path: &ast::Path, |
| suffixes: Option<&[(Ident, Option<Ident>)]>, |
| body: &Option<P<ast::Block>>, |
| ) { |
| if body.is_some() { |
| self.head(""); |
| } |
| self.print_visibility(vis); |
| self.word_nbsp("reuse"); |
| |
| if let Some(qself) = qself { |
| self.print_qpath(path, qself, false); |
| } else { |
| self.print_path(path, false, 0); |
| } |
| if let Some(suffixes) = suffixes { |
| self.word("::"); |
| self.word("{"); |
| for (i, (ident, rename)) in suffixes.iter().enumerate() { |
| self.print_ident(*ident); |
| if let Some(rename) = rename { |
| self.nbsp(); |
| self.word_nbsp("as"); |
| self.print_ident(*rename); |
| } |
| if i != suffixes.len() - 1 { |
| self.word_space(","); |
| } |
| } |
| self.word("}"); |
| } |
| if let Some(body) = body { |
| self.nbsp(); |
| self.print_block_with_attrs(body, attrs); |
| } else { |
| self.word(";"); |
| } |
| } |
| |
| fn print_fn_full( |
| &mut self, |
| sig: &ast::FnSig, |
| name: Ident, |
| generics: &ast::Generics, |
| vis: &ast::Visibility, |
| defaultness: ast::Defaultness, |
| body: Option<&ast::Block>, |
| attrs: &[ast::Attribute], |
| ) { |
| if body.is_some() { |
| self.head(""); |
| } |
| self.print_visibility(vis); |
| self.print_defaultness(defaultness); |
| self.print_fn(&sig.decl, sig.header, Some(name), generics); |
| if let Some(body) = body { |
| self.nbsp(); |
| self.print_block_with_attrs(body, attrs); |
| } else { |
| self.word(";"); |
| } |
| } |
| |
| pub(crate) fn print_fn( |
| &mut self, |
| decl: &ast::FnDecl, |
| header: ast::FnHeader, |
| name: Option<Ident>, |
| generics: &ast::Generics, |
| ) { |
| self.print_fn_header_info(header); |
| if let Some(name) = name { |
| self.nbsp(); |
| self.print_ident(name); |
| } |
| self.print_generic_params(&generics.params); |
| self.print_fn_params_and_ret(decl, false); |
| self.print_where_clause(&generics.where_clause) |
| } |
| |
| pub(crate) fn print_fn_params_and_ret(&mut self, decl: &ast::FnDecl, is_closure: bool) { |
| let (open, close) = if is_closure { ("|", "|") } else { ("(", ")") }; |
| self.word(open); |
| self.commasep(Inconsistent, &decl.inputs, |s, param| s.print_param(param, is_closure)); |
| self.word(close); |
| self.print_fn_ret_ty(&decl.output) |
| } |
| |
| fn print_where_clause(&mut self, where_clause: &ast::WhereClause) { |
| self.print_where_clause_parts(where_clause.has_where_token, &where_clause.predicates); |
| } |
| |
| fn print_where_clause_parts( |
| &mut self, |
| has_where_token: bool, |
| predicates: &[ast::WherePredicate], |
| ) { |
| if predicates.is_empty() && !has_where_token { |
| return; |
| } |
| |
| self.space(); |
| self.word_space("where"); |
| |
| for (i, predicate) in predicates.iter().enumerate() { |
| if i != 0 { |
| self.word_space(","); |
| } |
| |
| self.print_where_predicate(predicate); |
| } |
| } |
| |
| pub fn print_where_predicate(&mut self, predicate: &ast::WherePredicate) { |
| match predicate { |
| ast::WherePredicate::BoundPredicate(where_bound_predicate) => { |
| self.print_where_bound_predicate(where_bound_predicate); |
| } |
| ast::WherePredicate::RegionPredicate(ast::WhereRegionPredicate { |
| lifetime, |
| bounds, |
| .. |
| }) => { |
| self.print_lifetime(*lifetime); |
| self.word(":"); |
| if !bounds.is_empty() { |
| self.nbsp(); |
| self.print_lifetime_bounds(bounds); |
| } |
| } |
| ast::WherePredicate::EqPredicate(ast::WhereEqPredicate { lhs_ty, rhs_ty, .. }) => { |
| self.print_type(lhs_ty); |
| self.space(); |
| self.word_space("="); |
| self.print_type(rhs_ty); |
| } |
| } |
| } |
| |
| pub(crate) fn print_where_bound_predicate( |
| &mut self, |
| where_bound_predicate: &ast::WhereBoundPredicate, |
| ) { |
| self.print_formal_generic_params(&where_bound_predicate.bound_generic_params); |
| self.print_type(&where_bound_predicate.bounded_ty); |
| self.word(":"); |
| if !where_bound_predicate.bounds.is_empty() { |
| self.nbsp(); |
| self.print_type_bounds(&where_bound_predicate.bounds); |
| } |
| } |
| |
| fn print_use_tree(&mut self, tree: &ast::UseTree) { |
| match &tree.kind { |
| ast::UseTreeKind::Simple(rename) => { |
| self.print_path(&tree.prefix, false, 0); |
| if let &Some(rename) = rename { |
| self.nbsp(); |
| self.word_nbsp("as"); |
| self.print_ident(rename); |
| } |
| } |
| ast::UseTreeKind::Glob => { |
| if !tree.prefix.segments.is_empty() { |
| self.print_path(&tree.prefix, false, 0); |
| self.word("::"); |
| } |
| self.word("*"); |
| } |
| ast::UseTreeKind::Nested { items, .. } => { |
| if !tree.prefix.segments.is_empty() { |
| self.print_path(&tree.prefix, false, 0); |
| self.word("::"); |
| } |
| if items.is_empty() { |
| self.word("{}"); |
| } else if items.len() == 1 { |
| self.print_use_tree(&items[0].0); |
| } else { |
| self.cbox(INDENT_UNIT); |
| self.word("{"); |
| self.zerobreak(); |
| self.ibox(0); |
| for (pos, use_tree) in items.iter().with_position() { |
| let is_last = matches!(pos, Position::Last | Position::Only); |
| self.print_use_tree(&use_tree.0); |
| if !is_last { |
| self.word(","); |
| if let ast::UseTreeKind::Nested { .. } = use_tree.0.kind { |
| self.hardbreak(); |
| } else { |
| self.space(); |
| } |
| } |
| } |
| self.end(); |
| self.trailing_comma(); |
| self.offset(-INDENT_UNIT); |
| self.word("}"); |
| self.end(); |
| } |
| } |
| } |
| } |
| } |
