src/librustdoc/json/conversions.rs

   1 //! These from impls are used to create the JSON types which get serialized. They're very close to
   2 //! the `clean` types but with some fields removed or stringified to simplify the output and not
   3 //! expose unstable compiler internals.
   4
   5 #![allow(rustc::default_hash_types)]
   6
   7 use std::convert::From;
   8
   9 use rustc_ast::ast;
  10 use rustc_hir::def::CtorKind;
  11 use rustc_middle::ty::TyCtxt;
  12 use rustc_span::def_id::{DefId, CRATE_DEF_INDEX};
  13 use rustc_span::Pos;
  14
  15 use rustdoc_json_types::*;
  16
  17 use crate::clean;
  18 use crate::clean::utils::print_const_expr;
  19 use crate::formats::item_type::ItemType;
  20 use crate::json::JsonRenderer;
  21 use std::collections::HashSet;
  22
  23 impl JsonRenderer<'_> {
  24     pub(super) fn convert_item(&self, item: clean::Item) -> Option<Item> {
  25         let deprecation = item.deprecation(self.tcx);
  26         let links = self
  27             .cache
  28             .intra_doc_links
  29             .get(&item.def_id)
  30             .into_iter()
  31             .flatten()
  32             .filter_map(|clean::ItemLink { link, did, .. }| {
  33                 did.map(|did| (link.clone(), from_def_id(did)))
  34             })
  35             .collect();
  36         let docs = item.attrs.collapsed_doc_value();
  37         let attrs = item
  38             .attrs
  39             .other_attrs
  40             .iter()
  41             .map(rustc_ast_pretty::pprust::attribute_to_string)
  42             .collect();
  43         let span = item.span(self.tcx);
  44         let clean::Item { name, attrs: _, kind: _, visibility, def_id, cfg: _ } = item;
  45         let inner = match *item.kind {
  46             clean::StrippedItem(_) => return None,
  47             _ => from_clean_item(item, self.tcx),
  48         };
  49         Some(Item {
  50             id: from_def_id(def_id),
  51             crate_id: def_id.krate.as_u32(),
  52             name: name.map(|sym| sym.to_string()),
  53             span: self.convert_span(span),
  54             visibility: self.convert_visibility(visibility),
  55             docs,
  56             attrs,
  57             deprecation: deprecation.map(from_deprecation),
  58             inner,
  59             links,
  60         })
  61     }
  62
  63     fn convert_span(&self, span: clean::Span) -> Option<Span> {
  64         match span.filename(self.sess()) {
  65             rustc_span::FileName::Real(name) => {
  66                 let hi = span.hi(self.sess());
  67                 let lo = span.lo(self.sess());
  68                 Some(Span {
  69                     filename: name.into_local_path(),
  70                     begin: (lo.line, lo.col.to_usize()),
  71                     end: (hi.line, hi.col.to_usize()),
  72                 })
  73             }
  74             _ => None,
  75         }
  76     }
  77
  78     fn convert_visibility(&self, v: clean::Visibility) -> Visibility {
  79         use clean::Visibility::*;
  80         match v {
  81             Public => Visibility::Public,
  82             Inherited => Visibility::Default,
  83             Restricted(did) if did.index == CRATE_DEF_INDEX => Visibility::Crate,
  84             Restricted(did) => Visibility::Restricted {
  85                 parent: from_def_id(did),
  86                 path: self.tcx.def_path(did).to_string_no_crate_verbose(),
  87             },
  88         }
  89     }
  90 }
  91
  92 crate trait FromWithTcx<T> {
  93     fn from_tcx(f: T, tcx: TyCtxt<'_>) -> Self;
  94 }
  95
  96 crate trait IntoWithTcx<T> {
  97     fn into_tcx(self, tcx: TyCtxt<'_>) -> T;
  98 }
  99
 100 impl<T, U> IntoWithTcx<U> for T
 101 where
 102     U: FromWithTcx<T>,
 103 {
 104     fn into_tcx(self, tcx: TyCtxt<'_>) -> U {
 105         U::from_tcx(self, tcx)
 106     }
 107 }
 108
 109 crate fn from_deprecation(deprecation: rustc_attr::Deprecation) -> Deprecation {
 110     #[rustfmt::skip]
 111     let rustc_attr::Deprecation { since, note, is_since_rustc_version: _, suggestion: _ } = deprecation;
 112     Deprecation { since: since.map(|s| s.to_string()), note: note.map(|s| s.to_string()) }
 113 }
 114
 115 impl FromWithTcx<clean::GenericArgs> for GenericArgs {
 116     fn from_tcx(args: clean::GenericArgs, tcx: TyCtxt<'_>) -> Self {
 117         use clean::GenericArgs::*;
 118         match args {
 119             AngleBracketed { args, bindings } => GenericArgs::AngleBracketed {
 120                 args: args.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 121                 bindings: bindings.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 122             },
 123             Parenthesized { inputs, output } => GenericArgs::Parenthesized {
 124                 inputs: inputs.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 125                 output: output.map(|a| a.into_tcx(tcx)),
 126             },
 127         }
 128     }
 129 }
 130
 131 impl FromWithTcx<clean::GenericArg> for GenericArg {
 132     fn from_tcx(arg: clean::GenericArg, tcx: TyCtxt<'_>) -> Self {
 133         use clean::GenericArg::*;
 134         match arg {
 135             Lifetime(l) => GenericArg::Lifetime(l.0.to_string()),
 136             Type(t) => GenericArg::Type(t.into_tcx(tcx)),
 137             Const(c) => GenericArg::Const(c.into_tcx(tcx)),
 138         }
 139     }
 140 }
 141
 142 impl FromWithTcx<clean::Constant> for Constant {
 143     fn from_tcx(constant: clean::Constant, tcx: TyCtxt<'_>) -> Self {
 144         let expr = constant.expr(tcx);
 145         let value = constant.value(tcx);
 146         let is_literal = constant.is_literal(tcx);
 147         Constant { type_: constant.type_.into_tcx(tcx), expr, value, is_literal }
 148     }
 149 }
 150
 151 impl FromWithTcx<clean::TypeBinding> for TypeBinding {
 152     fn from_tcx(binding: clean::TypeBinding, tcx: TyCtxt<'_>) -> Self {
 153         TypeBinding { name: binding.name.to_string(), binding: binding.kind.into_tcx(tcx) }
 154     }
 155 }
 156
 157 impl FromWithTcx<clean::TypeBindingKind> for TypeBindingKind {
 158     fn from_tcx(kind: clean::TypeBindingKind, tcx: TyCtxt<'_>) -> Self {
 159         use clean::TypeBindingKind::*;
 160         match kind {
 161             Equality { ty } => TypeBindingKind::Equality(ty.into_tcx(tcx)),
 162             Constraint { bounds } => {
 163                 TypeBindingKind::Constraint(bounds.into_iter().map(|a| a.into_tcx(tcx)).collect())
 164             }
 165         }
 166     }
 167 }
 168
 169 crate fn from_def_id(did: DefId) -> Id {
 170     Id(format!("{}:{}", did.krate.as_u32(), u32::from(did.index)))
 171 }
 172
 173 fn from_clean_item(item: clean::Item, tcx: TyCtxt<'_>) -> ItemEnum {
 174     use clean::ItemKind::*;
 175     let name = item.name;
 176     let is_crate = item.is_crate();
 177     match *item.kind {
 178         ModuleItem(m) => ItemEnum::Module(Module { is_crate, items: ids(m.items) }),
 179         ImportItem(i) => ItemEnum::Import(i.into_tcx(tcx)),
 180         StructItem(s) => ItemEnum::Struct(s.into_tcx(tcx)),
 181         UnionItem(u) => ItemEnum::Union(u.into_tcx(tcx)),
 182         StructFieldItem(f) => ItemEnum::StructField(f.into_tcx(tcx)),
 183         EnumItem(e) => ItemEnum::Enum(e.into_tcx(tcx)),
 184         VariantItem(v) => ItemEnum::Variant(v.into_tcx(tcx)),
 185         FunctionItem(f) => ItemEnum::Function(f.into_tcx(tcx)),
 186         ForeignFunctionItem(f) => ItemEnum::Function(f.into_tcx(tcx)),
 187         TraitItem(t) => ItemEnum::Trait(t.into_tcx(tcx)),
 188         TraitAliasItem(t) => ItemEnum::TraitAlias(t.into_tcx(tcx)),
 189         MethodItem(m, _) => ItemEnum::Method(from_function_method(m, true, tcx)),
 190         TyMethodItem(m) => ItemEnum::Method(from_function_method(m, false, tcx)),
 191         ImplItem(i) => ItemEnum::Impl(i.into_tcx(tcx)),
 192         StaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 193         ForeignStaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 194         ForeignTypeItem => ItemEnum::ForeignType,
 195         TypedefItem(t, _) => ItemEnum::Typedef(t.into_tcx(tcx)),
 196         OpaqueTyItem(t) => ItemEnum::OpaqueTy(t.into_tcx(tcx)),
 197         ConstantItem(c) => ItemEnum::Constant(c.into_tcx(tcx)),
 198         MacroItem(m) => ItemEnum::Macro(m.source),
 199         ProcMacroItem(m) => ItemEnum::ProcMacro(m.into_tcx(tcx)),
 200         AssocConstItem(t, s) => ItemEnum::AssocConst { type_: t.into_tcx(tcx), default: s },
 201         AssocTypeItem(g, t) => ItemEnum::AssocType {
 202             bounds: g.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 203             default: t.map(|x| x.into_tcx(tcx)),
 204         },
 205         // `convert_item` early returns `None` for striped items
 206         StrippedItem(_) => unreachable!(),
 207         PrimitiveItem(_) | KeywordItem(_) => {
 208             panic!("{:?} is not supported for JSON output", item)
 209         }
 210         ExternCrateItem { ref src } => ItemEnum::ExternCrate {
 211             name: name.as_ref().unwrap().to_string(),
 212             rename: src.map(|x| x.to_string()),
 213         },
 214     }
 215 }
 216
 217 impl FromWithTcx<clean::Struct> for Struct {
 218     fn from_tcx(struct_: clean::Struct, tcx: TyCtxt<'_>) -> Self {
 219         let clean::Struct { struct_type, generics, fields, fields_stripped } = struct_;
 220         Struct {
 221             struct_type: from_ctor_kind(struct_type),
 222             generics: generics.into_tcx(tcx),
 223             fields_stripped,
 224             fields: ids(fields),
 225             impls: Vec::new(), // Added in JsonRenderer::item
 226         }
 227     }
 228 }
 229
 230 impl FromWithTcx<clean::Union> for Union {
 231     fn from_tcx(struct_: clean::Union, tcx: TyCtxt<'_>) -> Self {
 232         let clean::Union { generics, fields, fields_stripped } = struct_;
 233         Union {
 234             generics: generics.into_tcx(tcx),
 235             fields_stripped,
 236             fields: ids(fields),
 237             impls: Vec::new(), // Added in JsonRenderer::item
 238         }
 239     }
 240 }
 241
 242 crate fn from_ctor_kind(struct_type: CtorKind) -> StructType {
 243     match struct_type {
 244         CtorKind::Fictive => StructType::Plain,
 245         CtorKind::Fn => StructType::Tuple,
 246         CtorKind::Const => StructType::Unit,
 247     }
 248 }
 249
 250 crate fn from_fn_header(header: &rustc_hir::FnHeader) -> HashSet<Qualifiers> {
 251     let mut v = HashSet::new();
 252
 253     if let rustc_hir::Unsafety::Unsafe = header.unsafety {
 254         v.insert(Qualifiers::Unsafe);
 255     }
 256
 257     if let rustc_hir::IsAsync::Async = header.asyncness {
 258         v.insert(Qualifiers::Async);
 259     }
 260
 261     if let rustc_hir::Constness::Const = header.constness {
 262         v.insert(Qualifiers::Const);
 263     }
 264
 265     v
 266 }
 267
 268 impl FromWithTcx<clean::Function> for Function {
 269     fn from_tcx(function: clean::Function, tcx: TyCtxt<'_>) -> Self {
 270         let clean::Function { decl, generics, header } = function;
 271         Function {
 272             decl: decl.into_tcx(tcx),
 273             generics: generics.into_tcx(tcx),
 274             header: from_fn_header(&header),
 275             abi: header.abi.to_string(),
 276         }
 277     }
 278 }
 279
 280 impl FromWithTcx<clean::Generics> for Generics {
 281     fn from_tcx(generics: clean::Generics, tcx: TyCtxt<'_>) -> Self {
 282         Generics {
 283             params: generics.params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 284             where_predicates: generics
 285                 .where_predicates
 286                 .into_iter()
 287                 .map(|x| x.into_tcx(tcx))
 288                 .collect(),
 289         }
 290     }
 291 }
 292
 293 impl FromWithTcx<clean::GenericParamDef> for GenericParamDef {
 294     fn from_tcx(generic_param: clean::GenericParamDef, tcx: TyCtxt<'_>) -> Self {
 295         GenericParamDef {
 296             name: generic_param.name.to_string(),
 297             kind: generic_param.kind.into_tcx(tcx),
 298         }
 299     }
 300 }
 301
 302 impl FromWithTcx<clean::GenericParamDefKind> for GenericParamDefKind {
 303     fn from_tcx(kind: clean::GenericParamDefKind, tcx: TyCtxt<'_>) -> Self {
 304         use clean::GenericParamDefKind::*;
 305         match kind {
 306             Lifetime => GenericParamDefKind::Lifetime,
 307             Type { did: _, bounds, default, synthetic: _ } => GenericParamDefKind::Type {
 308                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 309                 default: default.map(|x| x.into_tcx(tcx)),
 310             },
 311             Const { did: _, ty } => GenericParamDefKind::Const(ty.into_tcx(tcx)),
 312         }
 313     }
 314 }
 315
 316 impl FromWithTcx<clean::WherePredicate> for WherePredicate {
 317     fn from_tcx(predicate: clean::WherePredicate, tcx: TyCtxt<'_>) -> Self {
 318         use clean::WherePredicate::*;
 319         match predicate {
 320             BoundPredicate { ty, bounds } => WherePredicate::BoundPredicate {
 321                 ty: ty.into_tcx(tcx),
 322                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 323             },
 324             RegionPredicate { lifetime, bounds } => WherePredicate::RegionPredicate {
 325                 lifetime: lifetime.0.to_string(),
 326                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 327             },
 328             EqPredicate { lhs, rhs } => {
 329                 WherePredicate::EqPredicate { lhs: lhs.into_tcx(tcx), rhs: rhs.into_tcx(tcx) }
 330             }
 331         }
 332     }
 333 }
 334
 335 impl FromWithTcx<clean::GenericBound> for GenericBound {
 336     fn from_tcx(bound: clean::GenericBound, tcx: TyCtxt<'_>) -> Self {
 337         use clean::GenericBound::*;
 338         match bound {
 339             TraitBound(clean::PolyTrait { trait_, generic_params }, modifier) => {
 340                 GenericBound::TraitBound {
 341                     trait_: trait_.into_tcx(tcx),
 342                     generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 343                     modifier: from_trait_bound_modifier(modifier),
 344                 }
 345             }
 346             Outlives(lifetime) => GenericBound::Outlives(lifetime.0.to_string()),
 347         }
 348     }
 349 }
 350
 351 crate fn from_trait_bound_modifier(modifier: rustc_hir::TraitBoundModifier) -> TraitBoundModifier {
 352     use rustc_hir::TraitBoundModifier::*;
 353     match modifier {
 354         None => TraitBoundModifier::None,
 355         Maybe => TraitBoundModifier::Maybe,
 356         MaybeConst => TraitBoundModifier::MaybeConst,
 357     }
 358 }
 359
 360 impl FromWithTcx<clean::Type> for Type {
 361     fn from_tcx(ty: clean::Type, tcx: TyCtxt<'_>) -> Self {
 362         use clean::Type::*;
 363         match ty {
 364             ResolvedPath { path, param_names, did, is_generic: _ } => Type::ResolvedPath {
 365                 name: path.whole_name(),
 366                 id: from_def_id(did),
 367                 args: path.segments.last().map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 368                 param_names: param_names
 369                     .map(|v| v.into_iter().map(|x| x.into_tcx(tcx)).collect())
 370                     .unwrap_or_default(),
 371             },
 372             Generic(s) => Type::Generic(s.to_string()),
 373             Primitive(p) => Type::Primitive(p.as_str().to_string()),
 374             BareFunction(f) => Type::FunctionPointer(Box::new((*f).into_tcx(tcx))),
 375             Tuple(t) => Type::Tuple(t.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 376             Slice(t) => Type::Slice(Box::new((*t).into_tcx(tcx))),
 377             Array(t, s) => Type::Array { type_: Box::new((*t).into_tcx(tcx)), len: s },
 378             ImplTrait(g) => Type::ImplTrait(g.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 379             Never => Type::Never,
 380             Infer => Type::Infer,
 381             RawPointer(mutability, type_) => Type::RawPointer {
 382                 mutable: mutability == ast::Mutability::Mut,
 383                 type_: Box::new((*type_).into_tcx(tcx)),
 384             },
 385             BorrowedRef { lifetime, mutability, type_ } => Type::BorrowedRef {
 386                 lifetime: lifetime.map(|l| l.0.to_string()),
 387                 mutable: mutability == ast::Mutability::Mut,
 388                 type_: Box::new((*type_).into_tcx(tcx)),
 389             },
 390             QPath { name, self_type, trait_ } => Type::QualifiedPath {
 391                 name: name.to_string(),
 392                 self_type: Box::new((*self_type).into_tcx(tcx)),
 393                 trait_: Box::new((*trait_).into_tcx(tcx)),
 394             },
 395         }
 396     }
 397 }
 398
 399 impl FromWithTcx<clean::BareFunctionDecl> for FunctionPointer {
 400     fn from_tcx(bare_decl: clean::BareFunctionDecl, tcx: TyCtxt<'_>) -> Self {
 401         let clean::BareFunctionDecl { unsafety, generic_params, decl, abi } = bare_decl;
 402         FunctionPointer {
 403             header: if let rustc_hir::Unsafety::Unsafe = unsafety {
 404                 let mut hs = HashSet::new();
 405                 hs.insert(Qualifiers::Unsafe);
 406                 hs
 407             } else {
 408                 HashSet::new()
 409             },
 410             generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 411             decl: decl.into_tcx(tcx),
 412             abi: abi.to_string(),
 413         }
 414     }
 415 }
 416
 417 impl FromWithTcx<clean::FnDecl> for FnDecl {
 418     fn from_tcx(decl: clean::FnDecl, tcx: TyCtxt<'_>) -> Self {
 419         let clean::FnDecl { inputs, output, c_variadic } = decl;
 420         FnDecl {
 421             inputs: inputs
 422                 .values
 423                 .into_iter()
 424                 .map(|arg| (arg.name.to_string(), arg.type_.into_tcx(tcx)))
 425                 .collect(),
 426             output: match output {
 427                 clean::FnRetTy::Return(t) => Some(t.into_tcx(tcx)),
 428                 clean::FnRetTy::DefaultReturn => None,
 429             },
 430             c_variadic,
 431         }
 432     }
 433 }
 434
 435 impl FromWithTcx<clean::Trait> for Trait {
 436     fn from_tcx(trait_: clean::Trait, tcx: TyCtxt<'_>) -> Self {
 437         let clean::Trait { unsafety, items, generics, bounds, is_auto } = trait_;
 438         Trait {
 439             is_auto,
 440             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 441             items: ids(items),
 442             generics: generics.into_tcx(tcx),
 443             bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 444             implementors: Vec::new(), // Added in JsonRenderer::item
 445         }
 446     }
 447 }
 448
 449 impl FromWithTcx<clean::Impl> for Impl {
 450     fn from_tcx(impl_: clean::Impl, tcx: TyCtxt<'_>) -> Self {
 451         let provided_trait_methods = impl_.provided_trait_methods(tcx);
 452         let clean::Impl {
 453             unsafety,
 454             generics,
 455             trait_,
 456             for_,
 457             items,
 458             negative_polarity,
 459             synthetic,
 460             blanket_impl,
 461             span: _span,
 462         } = impl_;
 463         Impl {
 464             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 465             generics: generics.into_tcx(tcx),
 466             provided_trait_methods: provided_trait_methods
 467                 .into_iter()
 468                 .map(|x| x.to_string())
 469                 .collect(),
 470             trait_: trait_.map(|x| x.into_tcx(tcx)),
 471             for_: for_.into_tcx(tcx),
 472             items: ids(items),
 473             negative: negative_polarity,
 474             synthetic,
 475             blanket_impl: blanket_impl.map(|x| x.into_tcx(tcx)),
 476         }
 477     }
 478 }
 479
 480 crate fn from_function_method(
 481     function: clean::Function,
 482     has_body: bool,
 483     tcx: TyCtxt<'_>,
 484 ) -> Method {
 485     let clean::Function { header, decl, generics } = function;
 486     Method {
 487         decl: decl.into_tcx(tcx),
 488         generics: generics.into_tcx(tcx),
 489         header: from_fn_header(&header),
 490         abi: header.abi.to_string(),
 491         has_body,
 492     }
 493 }
 494
 495 impl FromWithTcx<clean::Enum> for Enum {
 496     fn from_tcx(enum_: clean::Enum, tcx: TyCtxt<'_>) -> Self {
 497         let clean::Enum { variants, generics, variants_stripped } = enum_;
 498         Enum {
 499             generics: generics.into_tcx(tcx),
 500             variants_stripped,
 501             variants: ids(variants),
 502             impls: Vec::new(), // Added in JsonRenderer::item
 503         }
 504     }
 505 }
 506
 507 impl FromWithTcx<clean::VariantStruct> for Struct {
 508     fn from_tcx(struct_: clean::VariantStruct, _tcx: TyCtxt<'_>) -> Self {
 509         let clean::VariantStruct { struct_type, fields, fields_stripped } = struct_;
 510         Struct {
 511             struct_type: from_ctor_kind(struct_type),
 512             generics: Default::default(),
 513             fields_stripped,
 514             fields: ids(fields),
 515             impls: Vec::new(),
 516         }
 517     }
 518 }
 519
 520 impl FromWithTcx<clean::Variant> for Variant {
 521     fn from_tcx(variant: clean::Variant, tcx: TyCtxt<'_>) -> Self {
 522         use clean::Variant::*;
 523         match variant {
 524             CLike => Variant::Plain,
 525             Tuple(t) => Variant::Tuple(t.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 526             Struct(s) => Variant::Struct(ids(s.fields)),
 527         }
 528     }
 529 }
 530
 531 impl FromWithTcx<clean::Import> for Import {
 532     fn from_tcx(import: clean::Import, _tcx: TyCtxt<'_>) -> Self {
 533         use clean::ImportKind::*;
 534         match import.kind {
 535             Simple(s) => Import {
 536                 source: import.source.path.whole_name(),
 537                 name: s.to_string(),
 538                 id: import.source.did.map(from_def_id),
 539                 glob: false,
 540             },
 541             Glob => Import {
 542                 source: import.source.path.whole_name(),
 543                 name: import.source.path.last_name().to_string(),
 544                 id: import.source.did.map(from_def_id),
 545                 glob: true,
 546             },
 547         }
 548     }
 549 }
 550
 551 impl FromWithTcx<clean::ProcMacro> for ProcMacro {
 552     fn from_tcx(mac: clean::ProcMacro, _tcx: TyCtxt<'_>) -> Self {
 553         ProcMacro {
 554             kind: from_macro_kind(mac.kind),
 555             helpers: mac.helpers.iter().map(|x| x.to_string()).collect(),
 556         }
 557     }
 558 }
 559
 560 crate fn from_macro_kind(kind: rustc_span::hygiene::MacroKind) -> MacroKind {
 561     use rustc_span::hygiene::MacroKind::*;
 562     match kind {
 563         Bang => MacroKind::Bang,
 564         Attr => MacroKind::Attr,
 565         Derive => MacroKind::Derive,
 566     }
 567 }
 568
 569 impl FromWithTcx<clean::Typedef> for Typedef {
 570     fn from_tcx(typedef: clean::Typedef, tcx: TyCtxt<'_>) -> Self {
 571         let clean::Typedef { type_, generics, item_type: _ } = typedef;
 572         Typedef { type_: type_.into_tcx(tcx), generics: generics.into_tcx(tcx) }
 573     }
 574 }
 575
 576 impl FromWithTcx<clean::OpaqueTy> for OpaqueTy {
 577     fn from_tcx(opaque: clean::OpaqueTy, tcx: TyCtxt<'_>) -> Self {
 578         OpaqueTy {
 579             bounds: opaque.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 580             generics: opaque.generics.into_tcx(tcx),
 581         }
 582     }
 583 }
 584
 585 impl FromWithTcx<clean::Static> for Static {
 586     fn from_tcx(stat: clean::Static, tcx: TyCtxt<'_>) -> Self {
 587         Static {
 588             type_: stat.type_.into_tcx(tcx),
 589             mutable: stat.mutability == ast::Mutability::Mut,
 590             expr: stat.expr.map(|e| print_const_expr(tcx, e)).unwrap_or_default(),
 591         }
 592     }
 593 }
 594
 595 impl FromWithTcx<clean::TraitAlias> for TraitAlias {
 596     fn from_tcx(alias: clean::TraitAlias, tcx: TyCtxt<'_>) -> Self {
 597         TraitAlias {
 598             generics: alias.generics.into_tcx(tcx),
 599             params: alias.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 600         }
 601     }
 602 }
 603
 604 impl FromWithTcx<ItemType> for ItemKind {
 605     fn from_tcx(kind: ItemType, _tcx: TyCtxt<'_>) -> Self {
 606         use ItemType::*;
 607         match kind {
 608             Module => ItemKind::Module,
 609             ExternCrate => ItemKind::ExternCrate,
 610             Import => ItemKind::Import,
 611             Struct => ItemKind::Struct,
 612             Union => ItemKind::Union,
 613             Enum => ItemKind::Enum,
 614             Function => ItemKind::Function,
 615             Typedef => ItemKind::Typedef,
 616             OpaqueTy => ItemKind::OpaqueTy,
 617             Static => ItemKind::Static,
 618             Constant => ItemKind::Constant,
 619             Trait => ItemKind::Trait,
 620             Impl => ItemKind::Impl,
 621             TyMethod | Method => ItemKind::Method,
 622             StructField => ItemKind::StructField,
 623             Variant => ItemKind::Variant,
 624             Macro => ItemKind::Macro,
 625             Primitive => ItemKind::Primitive,
 626             AssocConst => ItemKind::AssocConst,
 627             AssocType => ItemKind::AssocType,
 628             ForeignType => ItemKind::ForeignType,
 629             Keyword => ItemKind::Keyword,
 630             TraitAlias => ItemKind::TraitAlias,
 631             ProcAttribute => ItemKind::ProcAttribute,
 632             ProcDerive => ItemKind::ProcDerive,
 633         }
 634     }
 635 }
 636
 637 fn ids(items: impl IntoIterator<Item = clean::Item>) -> Vec<Id> {
 638     items.into_iter().filter(|x| !x.is_stripped()).map(|i| from_def_id(i.def_id)).collect()
 639 }