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: match name {
  70                         rustc_span::RealFileName::Named(path) => path,
  71                         rustc_span::RealFileName::Devirtualized { local_path, virtual_name: _ } => {
  72                             local_path
  73                         }
  74                     },
  75                     begin: (lo.line, lo.col.to_usize()),
  76                     end: (hi.line, hi.col.to_usize()),
  77                 })
  78             }
  79             _ => None,
  80         }
  81     }
  82
  83     fn convert_visibility(&self, v: clean::Visibility) -> Visibility {
  84         use clean::Visibility::*;
  85         match v {
  86             Public => Visibility::Public,
  87             Inherited => Visibility::Default,
  88             Restricted(did) if did.index == CRATE_DEF_INDEX => Visibility::Crate,
  89             Restricted(did) => Visibility::Restricted {
  90                 parent: from_def_id(did),
  91                 path: self.tcx.def_path(did).to_string_no_crate_verbose(),
  92             },
  93         }
  94     }
  95 }
  96
  97 crate trait FromWithTcx<T> {
  98     fn from_tcx(f: T, tcx: TyCtxt<'_>) -> Self;
  99 }
 100
 101 crate trait IntoWithTcx<T> {
 102     fn into_tcx(self, tcx: TyCtxt<'_>) -> T;
 103 }
 104
 105 impl<T, U> IntoWithTcx<U> for T
 106 where
 107     U: FromWithTcx<T>,
 108 {
 109     fn into_tcx(self, tcx: TyCtxt<'_>) -> U {
 110         U::from_tcx(self, tcx)
 111     }
 112 }
 113
 114 crate fn from_deprecation(deprecation: rustc_attr::Deprecation) -> Deprecation {
 115     #[rustfmt::skip]
 116     let rustc_attr::Deprecation { since, note, is_since_rustc_version: _, suggestion: _ } = deprecation;
 117     Deprecation { since: since.map(|s| s.to_string()), note: note.map(|s| s.to_string()) }
 118 }
 119
 120 impl FromWithTcx<clean::GenericArgs> for GenericArgs {
 121     fn from_tcx(args: clean::GenericArgs, tcx: TyCtxt<'_>) -> Self {
 122         use clean::GenericArgs::*;
 123         match args {
 124             AngleBracketed { args, bindings } => GenericArgs::AngleBracketed {
 125                 args: args.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 126                 bindings: bindings.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 127             },
 128             Parenthesized { inputs, output } => GenericArgs::Parenthesized {
 129                 inputs: inputs.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 130                 output: output.map(|a| a.into_tcx(tcx)),
 131             },
 132         }
 133     }
 134 }
 135
 136 impl FromWithTcx<clean::GenericArg> for GenericArg {
 137     fn from_tcx(arg: clean::GenericArg, tcx: TyCtxt<'_>) -> Self {
 138         use clean::GenericArg::*;
 139         match arg {
 140             Lifetime(l) => GenericArg::Lifetime(l.0.to_string()),
 141             Type(t) => GenericArg::Type(t.into_tcx(tcx)),
 142             Const(c) => GenericArg::Const(c.into_tcx(tcx)),
 143         }
 144     }
 145 }
 146
 147 impl FromWithTcx<clean::Constant> for Constant {
 148     fn from_tcx(constant: clean::Constant, tcx: TyCtxt<'_>) -> Self {
 149         let expr = constant.expr(tcx);
 150         let value = constant.value(tcx);
 151         let is_literal = constant.is_literal(tcx);
 152         Constant { type_: constant.type_.into_tcx(tcx), expr, value, is_literal }
 153     }
 154 }
 155
 156 impl FromWithTcx<clean::TypeBinding> for TypeBinding {
 157     fn from_tcx(binding: clean::TypeBinding, tcx: TyCtxt<'_>) -> Self {
 158         TypeBinding { name: binding.name.to_string(), binding: binding.kind.into_tcx(tcx) }
 159     }
 160 }
 161
 162 impl FromWithTcx<clean::TypeBindingKind> for TypeBindingKind {
 163     fn from_tcx(kind: clean::TypeBindingKind, tcx: TyCtxt<'_>) -> Self {
 164         use clean::TypeBindingKind::*;
 165         match kind {
 166             Equality { ty } => TypeBindingKind::Equality(ty.into_tcx(tcx)),
 167             Constraint { bounds } => {
 168                 TypeBindingKind::Constraint(bounds.into_iter().map(|a| a.into_tcx(tcx)).collect())
 169             }
 170         }
 171     }
 172 }
 173
 174 crate fn from_def_id(did: DefId) -> Id {
 175     Id(format!("{}:{}", did.krate.as_u32(), u32::from(did.index)))
 176 }
 177
 178 fn from_clean_item(item: clean::Item, tcx: TyCtxt<'_>) -> ItemEnum {
 179     use clean::ItemKind::*;
 180     let name = item.name;
 181     let is_crate = item.is_crate();
 182     match *item.kind {
 183         ModuleItem(m) => ItemEnum::Module(Module { is_crate, items: ids(m.items) }),
 184         ImportItem(i) => ItemEnum::Import(i.into_tcx(tcx)),
 185         StructItem(s) => ItemEnum::Struct(s.into_tcx(tcx)),
 186         UnionItem(u) => ItemEnum::Union(u.into_tcx(tcx)),
 187         StructFieldItem(f) => ItemEnum::StructField(f.into_tcx(tcx)),
 188         EnumItem(e) => ItemEnum::Enum(e.into_tcx(tcx)),
 189         VariantItem(v) => ItemEnum::Variant(v.into_tcx(tcx)),
 190         FunctionItem(f) => ItemEnum::Function(f.into_tcx(tcx)),
 191         ForeignFunctionItem(f) => ItemEnum::Function(f.into_tcx(tcx)),
 192         TraitItem(t) => ItemEnum::Trait(t.into_tcx(tcx)),
 193         TraitAliasItem(t) => ItemEnum::TraitAlias(t.into_tcx(tcx)),
 194         MethodItem(m, _) => ItemEnum::Method(from_function_method(m, true, tcx)),
 195         TyMethodItem(m) => ItemEnum::Method(from_function_method(m, false, tcx)),
 196         ImplItem(i) => ItemEnum::Impl(i.into_tcx(tcx)),
 197         StaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 198         ForeignStaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 199         ForeignTypeItem => ItemEnum::ForeignType,
 200         TypedefItem(t, _) => ItemEnum::Typedef(t.into_tcx(tcx)),
 201         OpaqueTyItem(t) => ItemEnum::OpaqueTy(t.into_tcx(tcx)),
 202         ConstantItem(c) => ItemEnum::Constant(c.into_tcx(tcx)),
 203         MacroItem(m) => ItemEnum::Macro(m.source),
 204         ProcMacroItem(m) => ItemEnum::ProcMacro(m.into_tcx(tcx)),
 205         AssocConstItem(t, s) => ItemEnum::AssocConst { type_: t.into_tcx(tcx), default: s },
 206         AssocTypeItem(g, t) => ItemEnum::AssocType {
 207             bounds: g.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 208             default: t.map(|x| x.into_tcx(tcx)),
 209         },
 210         // `convert_item` early returns `None` for striped items
 211         StrippedItem(_) => unreachable!(),
 212         PrimitiveItem(_) | KeywordItem(_) => {
 213             panic!("{:?} is not supported for JSON output", item)
 214         }
 215         ExternCrateItem { ref src } => ItemEnum::ExternCrate {
 216             name: name.as_ref().unwrap().to_string(),
 217             rename: src.map(|x| x.to_string()),
 218         },
 219     }
 220 }
 221
 222 impl FromWithTcx<clean::Struct> for Struct {
 223     fn from_tcx(struct_: clean::Struct, tcx: TyCtxt<'_>) -> Self {
 224         let clean::Struct { struct_type, generics, fields, fields_stripped } = struct_;
 225         Struct {
 226             struct_type: from_ctor_kind(struct_type),
 227             generics: generics.into_tcx(tcx),
 228             fields_stripped,
 229             fields: ids(fields),
 230             impls: Vec::new(), // Added in JsonRenderer::item
 231         }
 232     }
 233 }
 234
 235 impl FromWithTcx<clean::Union> for Union {
 236     fn from_tcx(struct_: clean::Union, tcx: TyCtxt<'_>) -> Self {
 237         let clean::Union { generics, fields, fields_stripped } = struct_;
 238         Union {
 239             generics: generics.into_tcx(tcx),
 240             fields_stripped,
 241             fields: ids(fields),
 242             impls: Vec::new(), // Added in JsonRenderer::item
 243         }
 244     }
 245 }
 246
 247 crate fn from_ctor_kind(struct_type: CtorKind) -> StructType {
 248     match struct_type {
 249         CtorKind::Fictive => StructType::Plain,
 250         CtorKind::Fn => StructType::Tuple,
 251         CtorKind::Const => StructType::Unit,
 252     }
 253 }
 254
 255 crate fn from_fn_header(header: &rustc_hir::FnHeader) -> HashSet<Qualifiers> {
 256     let mut v = HashSet::new();
 257
 258     if let rustc_hir::Unsafety::Unsafe = header.unsafety {
 259         v.insert(Qualifiers::Unsafe);
 260     }
 261
 262     if let rustc_hir::IsAsync::Async = header.asyncness {
 263         v.insert(Qualifiers::Async);
 264     }
 265
 266     if let rustc_hir::Constness::Const = header.constness {
 267         v.insert(Qualifiers::Const);
 268     }
 269
 270     v
 271 }
 272
 273 impl FromWithTcx<clean::Function> for Function {
 274     fn from_tcx(function: clean::Function, tcx: TyCtxt<'_>) -> Self {
 275         let clean::Function { decl, generics, header } = function;
 276         Function {
 277             decl: decl.into_tcx(tcx),
 278             generics: generics.into_tcx(tcx),
 279             header: from_fn_header(&header),
 280             abi: header.abi.to_string(),
 281         }
 282     }
 283 }
 284
 285 impl FromWithTcx<clean::Generics> for Generics {
 286     fn from_tcx(generics: clean::Generics, tcx: TyCtxt<'_>) -> Self {
 287         Generics {
 288             params: generics.params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 289             where_predicates: generics
 290                 .where_predicates
 291                 .into_iter()
 292                 .map(|x| x.into_tcx(tcx))
 293                 .collect(),
 294         }
 295     }
 296 }
 297
 298 impl FromWithTcx<clean::GenericParamDef> for GenericParamDef {
 299     fn from_tcx(generic_param: clean::GenericParamDef, tcx: TyCtxt<'_>) -> Self {
 300         GenericParamDef {
 301             name: generic_param.name.to_string(),
 302             kind: generic_param.kind.into_tcx(tcx),
 303         }
 304     }
 305 }
 306
 307 impl FromWithTcx<clean::GenericParamDefKind> for GenericParamDefKind {
 308     fn from_tcx(kind: clean::GenericParamDefKind, tcx: TyCtxt<'_>) -> Self {
 309         use clean::GenericParamDefKind::*;
 310         match kind {
 311             Lifetime => GenericParamDefKind::Lifetime,
 312             Type { did: _, bounds, default, synthetic: _ } => GenericParamDefKind::Type {
 313                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 314                 default: default.map(|x| x.into_tcx(tcx)),
 315             },
 316             Const { did: _, ty } => GenericParamDefKind::Const(ty.into_tcx(tcx)),
 317         }
 318     }
 319 }
 320
 321 impl FromWithTcx<clean::WherePredicate> for WherePredicate {
 322     fn from_tcx(predicate: clean::WherePredicate, tcx: TyCtxt<'_>) -> Self {
 323         use clean::WherePredicate::*;
 324         match predicate {
 325             BoundPredicate { ty, bounds } => WherePredicate::BoundPredicate {
 326                 ty: ty.into_tcx(tcx),
 327                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 328             },
 329             RegionPredicate { lifetime, bounds } => WherePredicate::RegionPredicate {
 330                 lifetime: lifetime.0.to_string(),
 331                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 332             },
 333             EqPredicate { lhs, rhs } => {
 334                 WherePredicate::EqPredicate { lhs: lhs.into_tcx(tcx), rhs: rhs.into_tcx(tcx) }
 335             }
 336         }
 337     }
 338 }
 339
 340 impl FromWithTcx<clean::GenericBound> for GenericBound {
 341     fn from_tcx(bound: clean::GenericBound, tcx: TyCtxt<'_>) -> Self {
 342         use clean::GenericBound::*;
 343         match bound {
 344             TraitBound(clean::PolyTrait { trait_, generic_params }, modifier) => {
 345                 GenericBound::TraitBound {
 346                     trait_: trait_.into_tcx(tcx),
 347                     generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 348                     modifier: from_trait_bound_modifier(modifier),
 349                 }
 350             }
 351             Outlives(lifetime) => GenericBound::Outlives(lifetime.0.to_string()),
 352         }
 353     }
 354 }
 355
 356 crate fn from_trait_bound_modifier(modifier: rustc_hir::TraitBoundModifier) -> TraitBoundModifier {
 357     use rustc_hir::TraitBoundModifier::*;
 358     match modifier {
 359         None => TraitBoundModifier::None,
 360         Maybe => TraitBoundModifier::Maybe,
 361         MaybeConst => TraitBoundModifier::MaybeConst,
 362     }
 363 }
 364
 365 impl FromWithTcx<clean::Type> for Type {
 366     fn from_tcx(ty: clean::Type, tcx: TyCtxt<'_>) -> Self {
 367         use clean::Type::*;
 368         match ty {
 369             ResolvedPath { path, param_names, did, is_generic: _ } => Type::ResolvedPath {
 370                 name: path.whole_name(),
 371                 id: from_def_id(did),
 372                 args: path.segments.last().map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 373                 param_names: param_names
 374                     .map(|v| v.into_iter().map(|x| x.into_tcx(tcx)).collect())
 375                     .unwrap_or_default(),
 376             },
 377             Generic(s) => Type::Generic(s.to_string()),
 378             Primitive(p) => Type::Primitive(p.as_str().to_string()),
 379             BareFunction(f) => Type::FunctionPointer(Box::new((*f).into_tcx(tcx))),
 380             Tuple(t) => Type::Tuple(t.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 381             Slice(t) => Type::Slice(Box::new((*t).into_tcx(tcx))),
 382             Array(t, s) => Type::Array { type_: Box::new((*t).into_tcx(tcx)), len: s },
 383             ImplTrait(g) => Type::ImplTrait(g.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 384             Never => Type::Never,
 385             Infer => Type::Infer,
 386             RawPointer(mutability, type_) => Type::RawPointer {
 387                 mutable: mutability == ast::Mutability::Mut,
 388                 type_: Box::new((*type_).into_tcx(tcx)),
 389             },
 390             BorrowedRef { lifetime, mutability, type_ } => Type::BorrowedRef {
 391                 lifetime: lifetime.map(|l| l.0.to_string()),
 392                 mutable: mutability == ast::Mutability::Mut,
 393                 type_: Box::new((*type_).into_tcx(tcx)),
 394             },
 395             QPath { name, self_type, trait_ } => Type::QualifiedPath {
 396                 name: name.to_string(),
 397                 self_type: Box::new((*self_type).into_tcx(tcx)),
 398                 trait_: Box::new((*trait_).into_tcx(tcx)),
 399             },
 400         }
 401     }
 402 }
 403
 404 impl FromWithTcx<clean::BareFunctionDecl> for FunctionPointer {
 405     fn from_tcx(bare_decl: clean::BareFunctionDecl, tcx: TyCtxt<'_>) -> Self {
 406         let clean::BareFunctionDecl { unsafety, generic_params, decl, abi } = bare_decl;
 407         FunctionPointer {
 408             header: if let rustc_hir::Unsafety::Unsafe = unsafety {
 409                 let mut hs = HashSet::new();
 410                 hs.insert(Qualifiers::Unsafe);
 411                 hs
 412             } else {
 413                 HashSet::new()
 414             },
 415             generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 416             decl: decl.into_tcx(tcx),
 417             abi: abi.to_string(),
 418         }
 419     }
 420 }
 421
 422 impl FromWithTcx<clean::FnDecl> for FnDecl {
 423     fn from_tcx(decl: clean::FnDecl, tcx: TyCtxt<'_>) -> Self {
 424         let clean::FnDecl { inputs, output, c_variadic } = decl;
 425         FnDecl {
 426             inputs: inputs
 427                 .values
 428                 .into_iter()
 429                 .map(|arg| (arg.name.to_string(), arg.type_.into_tcx(tcx)))
 430                 .collect(),
 431             output: match output {
 432                 clean::FnRetTy::Return(t) => Some(t.into_tcx(tcx)),
 433                 clean::FnRetTy::DefaultReturn => None,
 434             },
 435             c_variadic,
 436         }
 437     }
 438 }
 439
 440 impl FromWithTcx<clean::Trait> for Trait {
 441     fn from_tcx(trait_: clean::Trait, tcx: TyCtxt<'_>) -> Self {
 442         let clean::Trait { unsafety, items, generics, bounds, is_auto } = trait_;
 443         Trait {
 444             is_auto,
 445             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 446             items: ids(items),
 447             generics: generics.into_tcx(tcx),
 448             bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 449             implementors: Vec::new(), // Added in JsonRenderer::item
 450         }
 451     }
 452 }
 453
 454 impl FromWithTcx<clean::Impl> for Impl {
 455     fn from_tcx(impl_: clean::Impl, tcx: TyCtxt<'_>) -> Self {
 456         let clean::Impl {
 457             unsafety,
 458             generics,
 459             provided_trait_methods,
 460             trait_,
 461             for_,
 462             items,
 463             negative_polarity,
 464             synthetic,
 465             blanket_impl,
 466             span: _span,
 467         } = impl_;
 468         Impl {
 469             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 470             generics: generics.into_tcx(tcx),
 471             provided_trait_methods: provided_trait_methods
 472                 .into_iter()
 473                 .map(|x| x.to_string())
 474                 .collect(),
 475             trait_: trait_.map(|x| x.into_tcx(tcx)),
 476             for_: for_.into_tcx(tcx),
 477             items: ids(items),
 478             negative: negative_polarity,
 479             synthetic,
 480             blanket_impl: blanket_impl.map(|x| x.into_tcx(tcx)),
 481         }
 482     }
 483 }
 484
 485 crate fn from_function_method(
 486     function: clean::Function,
 487     has_body: bool,
 488     tcx: TyCtxt<'_>,
 489 ) -> Method {
 490     let clean::Function { header, decl, generics } = function;
 491     Method {
 492         decl: decl.into_tcx(tcx),
 493         generics: generics.into_tcx(tcx),
 494         header: from_fn_header(&header),
 495         abi: header.abi.to_string(),
 496         has_body,
 497     }
 498 }
 499
 500 impl FromWithTcx<clean::Enum> for Enum {
 501     fn from_tcx(enum_: clean::Enum, tcx: TyCtxt<'_>) -> Self {
 502         let clean::Enum { variants, generics, variants_stripped } = enum_;
 503         Enum {
 504             generics: generics.into_tcx(tcx),
 505             variants_stripped,
 506             variants: ids(variants),
 507             impls: Vec::new(), // Added in JsonRenderer::item
 508         }
 509     }
 510 }
 511
 512 impl FromWithTcx<clean::VariantStruct> for Struct {
 513     fn from_tcx(struct_: clean::VariantStruct, _tcx: TyCtxt<'_>) -> Self {
 514         let clean::VariantStruct { struct_type, fields, fields_stripped } = struct_;
 515         Struct {
 516             struct_type: from_ctor_kind(struct_type),
 517             generics: Default::default(),
 518             fields_stripped,
 519             fields: ids(fields),
 520             impls: Vec::new(),
 521         }
 522     }
 523 }
 524
 525 impl FromWithTcx<clean::Variant> for Variant {
 526     fn from_tcx(variant: clean::Variant, tcx: TyCtxt<'_>) -> Self {
 527         use clean::Variant::*;
 528         match variant {
 529             CLike => Variant::Plain,
 530             Tuple(t) => Variant::Tuple(t.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 531             Struct(s) => Variant::Struct(ids(s.fields)),
 532         }
 533     }
 534 }
 535
 536 impl FromWithTcx<clean::Import> for Import {
 537     fn from_tcx(import: clean::Import, _tcx: TyCtxt<'_>) -> Self {
 538         use clean::ImportKind::*;
 539         match import.kind {
 540             Simple(s) => Import {
 541                 source: import.source.path.whole_name(),
 542                 name: s.to_string(),
 543                 id: import.source.did.map(from_def_id),
 544                 glob: false,
 545             },
 546             Glob => Import {
 547                 source: import.source.path.whole_name(),
 548                 name: import.source.path.last_name().to_string(),
 549                 id: import.source.did.map(from_def_id),
 550                 glob: true,
 551             },
 552         }
 553     }
 554 }
 555
 556 impl FromWithTcx<clean::ProcMacro> for ProcMacro {
 557     fn from_tcx(mac: clean::ProcMacro, _tcx: TyCtxt<'_>) -> Self {
 558         ProcMacro {
 559             kind: from_macro_kind(mac.kind),
 560             helpers: mac.helpers.iter().map(|x| x.to_string()).collect(),
 561         }
 562     }
 563 }
 564
 565 crate fn from_macro_kind(kind: rustc_span::hygiene::MacroKind) -> MacroKind {
 566     use rustc_span::hygiene::MacroKind::*;
 567     match kind {
 568         Bang => MacroKind::Bang,
 569         Attr => MacroKind::Attr,
 570         Derive => MacroKind::Derive,
 571     }
 572 }
 573
 574 impl FromWithTcx<clean::Typedef> for Typedef {
 575     fn from_tcx(typedef: clean::Typedef, tcx: TyCtxt<'_>) -> Self {
 576         let clean::Typedef { type_, generics, item_type: _ } = typedef;
 577         Typedef { type_: type_.into_tcx(tcx), generics: generics.into_tcx(tcx) }
 578     }
 579 }
 580
 581 impl FromWithTcx<clean::OpaqueTy> for OpaqueTy {
 582     fn from_tcx(opaque: clean::OpaqueTy, tcx: TyCtxt<'_>) -> Self {
 583         OpaqueTy {
 584             bounds: opaque.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 585             generics: opaque.generics.into_tcx(tcx),
 586         }
 587     }
 588 }
 589
 590 impl FromWithTcx<clean::Static> for Static {
 591     fn from_tcx(stat: clean::Static, tcx: TyCtxt<'_>) -> Self {
 592         Static {
 593             type_: stat.type_.into_tcx(tcx),
 594             mutable: stat.mutability == ast::Mutability::Mut,
 595             expr: stat.expr.map(|e| print_const_expr(tcx, e)).unwrap_or_default(),
 596         }
 597     }
 598 }
 599
 600 impl FromWithTcx<clean::TraitAlias> for TraitAlias {
 601     fn from_tcx(alias: clean::TraitAlias, tcx: TyCtxt<'_>) -> Self {
 602         TraitAlias {
 603             generics: alias.generics.into_tcx(tcx),
 604             params: alias.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 605         }
 606     }
 607 }
 608
 609 impl FromWithTcx<ItemType> for ItemKind {
 610     fn from_tcx(kind: ItemType, _tcx: TyCtxt<'_>) -> Self {
 611         use ItemType::*;
 612         match kind {
 613             Module => ItemKind::Module,
 614             ExternCrate => ItemKind::ExternCrate,
 615             Import => ItemKind::Import,
 616             Struct => ItemKind::Struct,
 617             Union => ItemKind::Union,
 618             Enum => ItemKind::Enum,
 619             Function => ItemKind::Function,
 620             Typedef => ItemKind::Typedef,
 621             OpaqueTy => ItemKind::OpaqueTy,
 622             Static => ItemKind::Static,
 623             Constant => ItemKind::Constant,
 624             Trait => ItemKind::Trait,
 625             Impl => ItemKind::Impl,
 626             TyMethod | Method => ItemKind::Method,
 627             StructField => ItemKind::StructField,
 628             Variant => ItemKind::Variant,
 629             Macro => ItemKind::Macro,
 630             Primitive => ItemKind::Primitive,
 631             AssocConst => ItemKind::AssocConst,
 632             AssocType => ItemKind::AssocType,
 633             ForeignType => ItemKind::ForeignType,
 634             Keyword => ItemKind::Keyword,
 635             TraitAlias => ItemKind::TraitAlias,
 636             ProcAttribute => ItemKind::ProcAttribute,
 637             ProcDerive => ItemKind::ProcDerive,
 638         }
 639     }
 640 }
 641
 642 fn ids(items: impl IntoIterator<Item = clean::Item>) -> Vec<Id> {
 643     items.into_iter().filter(|x| !x.is_stripped()).map(|i| from_def_id(i.def_id)).collect()
 644 }