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 use std::fmt;
   9
  10 use rustc_ast::ast;
  11 use rustc_hir::{def::CtorKind, def_id::DefId};
  12 use rustc_middle::ty::TyCtxt;
  13 use rustc_span::def_id::CRATE_DEF_INDEX;
  14 use rustc_span::Pos;
  15
  16 use rustdoc_json_types::*;
  17
  18 use crate::clean::utils::print_const_expr;
  19 use crate::clean::{self, ItemId};
  20 use crate::formats::item_type::ItemType;
  21 use crate::json::JsonRenderer;
  22 use std::collections::HashSet;
  23
  24 impl JsonRenderer<'_> {
  25     pub(super) fn convert_item(&self, item: clean::Item) -> Option<Item> {
  26         let deprecation = item.deprecation(self.tcx);
  27         let links = self
  28             .cache
  29             .intra_doc_links
  30             .get(&item.def_id)
  31             .into_iter()
  32             .flatten()
  33             .filter_map(|clean::ItemLink { link, did, .. }| {
  34                 did.map(|did| (link.clone(), from_item_id(did.into())))
  35             })
  36             .collect();
  37         let docs = item.attrs.collapsed_doc_value();
  38         let attrs = item
  39             .attrs
  40             .other_attrs
  41             .iter()
  42             .map(rustc_ast_pretty::pprust::attribute_to_string)
  43             .collect();
  44         let span = item.span(self.tcx);
  45         let clean::Item { name, attrs: _, kind: _, visibility, def_id, cfg: _ } = item;
  46         let inner = match *item.kind {
  47             clean::StrippedItem(_) => return None,
  48             _ => from_clean_item(item, self.tcx),
  49         };
  50         Some(Item {
  51             id: from_item_id(def_id),
  52             crate_id: def_id.krate().as_u32(),
  53             name: name.map(|sym| sym.to_string()),
  54             span: self.convert_span(span),
  55             visibility: self.convert_visibility(visibility),
  56             docs,
  57             attrs,
  58             deprecation: deprecation.map(from_deprecation),
  59             inner,
  60             links,
  61         })
  62     }
  63
  64     fn convert_span(&self, span: clean::Span) -> Option<Span> {
  65         match span.filename(self.sess()) {
  66             rustc_span::FileName::Real(name) => {
  67                 if let Some(local_path) = name.into_local_path() {
  68                     let hi = span.hi(self.sess());
  69                     let lo = span.lo(self.sess());
  70                     Some(Span {
  71                         filename: local_path,
  72                         begin: (lo.line, lo.col.to_usize()),
  73                         end: (hi.line, hi.col.to_usize()),
  74                     })
  75                 } else {
  76                     None
  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_item_id(did.into()),
  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             Infer => GenericArg::Infer,
 144         }
 145     }
 146 }
 147
 148 impl FromWithTcx<clean::Constant> for Constant {
 149     fn from_tcx(constant: clean::Constant, tcx: TyCtxt<'_>) -> Self {
 150         let expr = constant.expr(tcx);
 151         let value = constant.value(tcx);
 152         let is_literal = constant.is_literal(tcx);
 153         Constant { type_: constant.type_.into_tcx(tcx), expr, value, is_literal }
 154     }
 155 }
 156
 157 impl FromWithTcx<clean::TypeBinding> for TypeBinding {
 158     fn from_tcx(binding: clean::TypeBinding, tcx: TyCtxt<'_>) -> Self {
 159         TypeBinding { name: binding.name.to_string(), binding: binding.kind.into_tcx(tcx) }
 160     }
 161 }
 162
 163 impl FromWithTcx<clean::TypeBindingKind> for TypeBindingKind {
 164     fn from_tcx(kind: clean::TypeBindingKind, tcx: TyCtxt<'_>) -> Self {
 165         use clean::TypeBindingKind::*;
 166         match kind {
 167             Equality { ty } => TypeBindingKind::Equality(ty.into_tcx(tcx)),
 168             Constraint { bounds } => {
 169                 TypeBindingKind::Constraint(bounds.into_iter().map(|a| a.into_tcx(tcx)).collect())
 170             }
 171         }
 172     }
 173 }
 174
 175 crate fn from_item_id(did: ItemId) -> Id {
 176     struct DisplayDefId(DefId);
 177
 178     impl fmt::Display for DisplayDefId {
 179         fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 180             write!(f, "{}:{}", self.0.krate.as_u32(), u32::from(self.0.index))
 181         }
 182     }
 183
 184     match did {
 185         ItemId::DefId(did) => Id(format!("{}", DisplayDefId(did))),
 186         ItemId::Blanket { for_, impl_id } => {
 187             Id(format!("b:{}-{}", DisplayDefId(impl_id), DisplayDefId(for_)))
 188         }
 189         ItemId::Auto { for_, trait_ } => {
 190             Id(format!("a:{}-{}", DisplayDefId(trait_), DisplayDefId(for_)))
 191         }
 192         ItemId::Primitive(ty, krate) => Id(format!("p:{}:{}", krate.as_u32(), ty.as_sym())),
 193     }
 194 }
 195
 196 fn from_clean_item(item: clean::Item, tcx: TyCtxt<'_>) -> ItemEnum {
 197     use clean::ItemKind::*;
 198     let name = item.name;
 199     let is_crate = item.is_crate();
 200     match *item.kind {
 201         ModuleItem(m) => ItemEnum::Module(Module { is_crate, items: ids(m.items) }),
 202         ImportItem(i) => ItemEnum::Import(i.into_tcx(tcx)),
 203         StructItem(s) => ItemEnum::Struct(s.into_tcx(tcx)),
 204         UnionItem(u) => ItemEnum::Union(u.into_tcx(tcx)),
 205         StructFieldItem(f) => ItemEnum::StructField(f.into_tcx(tcx)),
 206         EnumItem(e) => ItemEnum::Enum(e.into_tcx(tcx)),
 207         VariantItem(v) => ItemEnum::Variant(v.into_tcx(tcx)),
 208         FunctionItem(f) => ItemEnum::Function(f.into_tcx(tcx)),
 209         ForeignFunctionItem(f) => ItemEnum::Function(f.into_tcx(tcx)),
 210         TraitItem(t) => ItemEnum::Trait(t.into_tcx(tcx)),
 211         TraitAliasItem(t) => ItemEnum::TraitAlias(t.into_tcx(tcx)),
 212         MethodItem(m, _) => ItemEnum::Method(from_function_method(m, true, tcx)),
 213         TyMethodItem(m) => ItemEnum::Method(from_function_method(m, false, tcx)),
 214         ImplItem(i) => ItemEnum::Impl(i.into_tcx(tcx)),
 215         StaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 216         ForeignStaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 217         ForeignTypeItem => ItemEnum::ForeignType,
 218         TypedefItem(t, _) => ItemEnum::Typedef(t.into_tcx(tcx)),
 219         OpaqueTyItem(t) => ItemEnum::OpaqueTy(t.into_tcx(tcx)),
 220         ConstantItem(c) => ItemEnum::Constant(c.into_tcx(tcx)),
 221         MacroItem(m) => ItemEnum::Macro(m.source),
 222         ProcMacroItem(m) => ItemEnum::ProcMacro(m.into_tcx(tcx)),
 223         AssocConstItem(t, s) => ItemEnum::AssocConst { type_: t.into_tcx(tcx), default: s },
 224         AssocTypeItem(g, t) => ItemEnum::AssocType {
 225             bounds: g.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 226             default: t.map(|x| x.into_tcx(tcx)),
 227         },
 228         // `convert_item` early returns `None` for striped items
 229         StrippedItem(_) => unreachable!(),
 230         PrimitiveItem(_) | KeywordItem(_) => {
 231             panic!("{:?} is not supported for JSON output", item)
 232         }
 233         ExternCrateItem { ref src } => ItemEnum::ExternCrate {
 234             name: name.as_ref().unwrap().to_string(),
 235             rename: src.map(|x| x.to_string()),
 236         },
 237     }
 238 }
 239
 240 impl FromWithTcx<clean::Struct> for Struct {
 241     fn from_tcx(struct_: clean::Struct, tcx: TyCtxt<'_>) -> Self {
 242         let clean::Struct { struct_type, generics, fields, fields_stripped } = struct_;
 243         Struct {
 244             struct_type: from_ctor_kind(struct_type),
 245             generics: generics.into_tcx(tcx),
 246             fields_stripped,
 247             fields: ids(fields),
 248             impls: Vec::new(), // Added in JsonRenderer::item
 249         }
 250     }
 251 }
 252
 253 impl FromWithTcx<clean::Union> for Union {
 254     fn from_tcx(struct_: clean::Union, tcx: TyCtxt<'_>) -> Self {
 255         let clean::Union { generics, fields, fields_stripped } = struct_;
 256         Union {
 257             generics: generics.into_tcx(tcx),
 258             fields_stripped,
 259             fields: ids(fields),
 260             impls: Vec::new(), // Added in JsonRenderer::item
 261         }
 262     }
 263 }
 264
 265 crate fn from_ctor_kind(struct_type: CtorKind) -> StructType {
 266     match struct_type {
 267         CtorKind::Fictive => StructType::Plain,
 268         CtorKind::Fn => StructType::Tuple,
 269         CtorKind::Const => StructType::Unit,
 270     }
 271 }
 272
 273 crate fn from_fn_header(header: &rustc_hir::FnHeader) -> HashSet<Qualifiers> {
 274     let mut v = HashSet::new();
 275
 276     if let rustc_hir::Unsafety::Unsafe = header.unsafety {
 277         v.insert(Qualifiers::Unsafe);
 278     }
 279
 280     if let rustc_hir::IsAsync::Async = header.asyncness {
 281         v.insert(Qualifiers::Async);
 282     }
 283
 284     if let rustc_hir::Constness::Const = header.constness {
 285         v.insert(Qualifiers::Const);
 286     }
 287
 288     v
 289 }
 290
 291 impl FromWithTcx<clean::Function> for Function {
 292     fn from_tcx(function: clean::Function, tcx: TyCtxt<'_>) -> Self {
 293         let clean::Function { decl, generics, header } = function;
 294         Function {
 295             decl: decl.into_tcx(tcx),
 296             generics: generics.into_tcx(tcx),
 297             header: from_fn_header(&header),
 298             abi: header.abi.to_string(),
 299         }
 300     }
 301 }
 302
 303 impl FromWithTcx<clean::Generics> for Generics {
 304     fn from_tcx(generics: clean::Generics, tcx: TyCtxt<'_>) -> Self {
 305         Generics {
 306             params: generics.params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 307             where_predicates: generics
 308                 .where_predicates
 309                 .into_iter()
 310                 .map(|x| x.into_tcx(tcx))
 311                 .collect(),
 312         }
 313     }
 314 }
 315
 316 impl FromWithTcx<clean::GenericParamDef> for GenericParamDef {
 317     fn from_tcx(generic_param: clean::GenericParamDef, tcx: TyCtxt<'_>) -> Self {
 318         GenericParamDef {
 319             name: generic_param.name.to_string(),
 320             kind: generic_param.kind.into_tcx(tcx),
 321         }
 322     }
 323 }
 324
 325 impl FromWithTcx<clean::GenericParamDefKind> for GenericParamDefKind {
 326     fn from_tcx(kind: clean::GenericParamDefKind, tcx: TyCtxt<'_>) -> Self {
 327         use clean::GenericParamDefKind::*;
 328         match kind {
 329             Lifetime => GenericParamDefKind::Lifetime,
 330             Type { did: _, bounds, default, synthetic: _ } => GenericParamDefKind::Type {
 331                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 332                 default: default.map(|x| x.into_tcx(tcx)),
 333             },
 334             Const { did: _, ty, default } => {
 335                 GenericParamDefKind::Const { ty: ty.into_tcx(tcx), default }
 336             }
 337         }
 338     }
 339 }
 340
 341 impl FromWithTcx<clean::WherePredicate> for WherePredicate {
 342     fn from_tcx(predicate: clean::WherePredicate, tcx: TyCtxt<'_>) -> Self {
 343         use clean::WherePredicate::*;
 344         match predicate {
 345             BoundPredicate { ty, bounds, .. } => WherePredicate::BoundPredicate {
 346                 ty: ty.into_tcx(tcx),
 347                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 348                 // FIXME: add `bound_params` to rustdoc-json-params?
 349             },
 350             RegionPredicate { lifetime, bounds } => WherePredicate::RegionPredicate {
 351                 lifetime: lifetime.0.to_string(),
 352                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 353             },
 354             EqPredicate { lhs, rhs } => {
 355                 WherePredicate::EqPredicate { lhs: lhs.into_tcx(tcx), rhs: rhs.into_tcx(tcx) }
 356             }
 357         }
 358     }
 359 }
 360
 361 impl FromWithTcx<clean::GenericBound> for GenericBound {
 362     fn from_tcx(bound: clean::GenericBound, tcx: TyCtxt<'_>) -> Self {
 363         use clean::GenericBound::*;
 364         match bound {
 365             TraitBound(clean::PolyTrait { trait_, generic_params }, modifier) => {
 366                 GenericBound::TraitBound {
 367                     trait_: trait_.into_tcx(tcx),
 368                     generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 369                     modifier: from_trait_bound_modifier(modifier),
 370                 }
 371             }
 372             Outlives(lifetime) => GenericBound::Outlives(lifetime.0.to_string()),
 373         }
 374     }
 375 }
 376
 377 crate fn from_trait_bound_modifier(modifier: rustc_hir::TraitBoundModifier) -> TraitBoundModifier {
 378     use rustc_hir::TraitBoundModifier::*;
 379     match modifier {
 380         None => TraitBoundModifier::None,
 381         Maybe => TraitBoundModifier::Maybe,
 382         MaybeConst => TraitBoundModifier::MaybeConst,
 383     }
 384 }
 385
 386 impl FromWithTcx<clean::Type> for Type {
 387     fn from_tcx(ty: clean::Type, tcx: TyCtxt<'_>) -> Self {
 388         use clean::Type::*;
 389         match ty {
 390             ResolvedPath { path, did, is_generic: _ } => Type::ResolvedPath {
 391                 name: path.whole_name(),
 392                 id: from_item_id(did.into()),
 393                 args: path.segments.last().map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 394                 param_names: Vec::new(),
 395             },
 396             DynTrait(mut bounds, lt) => {
 397                 let (path, id) = match bounds.remove(0).trait_ {
 398                     ResolvedPath { path, did, .. } => (path, did),
 399                     _ => unreachable!(),
 400                 };
 401
 402                 Type::ResolvedPath {
 403                     name: path.whole_name(),
 404                     id: from_item_id(id.into()),
 405                     args: path
 406                         .segments
 407                         .last()
 408                         .map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 409                     param_names: bounds
 410                         .into_iter()
 411                         .map(|t| {
 412                             clean::GenericBound::TraitBound(t, rustc_hir::TraitBoundModifier::None)
 413                         })
 414                         .chain(lt.into_iter().map(|lt| clean::GenericBound::Outlives(lt)))
 415                         .map(|bound| bound.into_tcx(tcx))
 416                         .collect(),
 417                 }
 418             }
 419             Generic(s) => Type::Generic(s.to_string()),
 420             Primitive(p) => Type::Primitive(p.as_sym().to_string()),
 421             BareFunction(f) => Type::FunctionPointer(Box::new((*f).into_tcx(tcx))),
 422             Tuple(t) => Type::Tuple(t.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 423             Slice(t) => Type::Slice(Box::new((*t).into_tcx(tcx))),
 424             Array(t, s) => Type::Array { type_: Box::new((*t).into_tcx(tcx)), len: s },
 425             ImplTrait(g) => Type::ImplTrait(g.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 426             Never => Type::Never,
 427             Infer => Type::Infer,
 428             RawPointer(mutability, type_) => Type::RawPointer {
 429                 mutable: mutability == ast::Mutability::Mut,
 430                 type_: Box::new((*type_).into_tcx(tcx)),
 431             },
 432             BorrowedRef { lifetime, mutability, type_ } => Type::BorrowedRef {
 433                 lifetime: lifetime.map(|l| l.0.to_string()),
 434                 mutable: mutability == ast::Mutability::Mut,
 435                 type_: Box::new((*type_).into_tcx(tcx)),
 436             },
 437             QPath { name, self_type, trait_, .. } => Type::QualifiedPath {
 438                 name: name.to_string(),
 439                 self_type: Box::new((*self_type).into_tcx(tcx)),
 440                 trait_: Box::new((*trait_).into_tcx(tcx)),
 441             },
 442         }
 443     }
 444 }
 445
 446 impl FromWithTcx<clean::BareFunctionDecl> for FunctionPointer {
 447     fn from_tcx(bare_decl: clean::BareFunctionDecl, tcx: TyCtxt<'_>) -> Self {
 448         let clean::BareFunctionDecl { unsafety, generic_params, decl, abi } = bare_decl;
 449         FunctionPointer {
 450             header: if let rustc_hir::Unsafety::Unsafe = unsafety {
 451                 let mut hs = HashSet::new();
 452                 hs.insert(Qualifiers::Unsafe);
 453                 hs
 454             } else {
 455                 HashSet::new()
 456             },
 457             generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 458             decl: decl.into_tcx(tcx),
 459             abi: abi.to_string(),
 460         }
 461     }
 462 }
 463
 464 impl FromWithTcx<clean::FnDecl> for FnDecl {
 465     fn from_tcx(decl: clean::FnDecl, tcx: TyCtxt<'_>) -> Self {
 466         let clean::FnDecl { inputs, output, c_variadic } = decl;
 467         FnDecl {
 468             inputs: inputs
 469                 .values
 470                 .into_iter()
 471                 .map(|arg| (arg.name.to_string(), arg.type_.into_tcx(tcx)))
 472                 .collect(),
 473             output: match output {
 474                 clean::FnRetTy::Return(t) => Some(t.into_tcx(tcx)),
 475                 clean::FnRetTy::DefaultReturn => None,
 476             },
 477             c_variadic,
 478         }
 479     }
 480 }
 481
 482 impl FromWithTcx<clean::Trait> for Trait {
 483     fn from_tcx(trait_: clean::Trait, tcx: TyCtxt<'_>) -> Self {
 484         let clean::Trait { unsafety, items, generics, bounds, is_auto } = trait_;
 485         Trait {
 486             is_auto,
 487             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 488             items: ids(items),
 489             generics: generics.into_tcx(tcx),
 490             bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 491             implementors: Vec::new(), // Added in JsonRenderer::item
 492         }
 493     }
 494 }
 495
 496 impl FromWithTcx<clean::Impl> for Impl {
 497     fn from_tcx(impl_: clean::Impl, tcx: TyCtxt<'_>) -> Self {
 498         let provided_trait_methods = impl_.provided_trait_methods(tcx);
 499         let clean::Impl {
 500             unsafety,
 501             generics,
 502             trait_,
 503             for_,
 504             items,
 505             negative_polarity,
 506             synthetic,
 507             blanket_impl,
 508             span: _span,
 509         } = impl_;
 510         Impl {
 511             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 512             generics: generics.into_tcx(tcx),
 513             provided_trait_methods: provided_trait_methods
 514                 .into_iter()
 515                 .map(|x| x.to_string())
 516                 .collect(),
 517             trait_: trait_.map(|x| x.into_tcx(tcx)),
 518             for_: for_.into_tcx(tcx),
 519             items: ids(items),
 520             negative: negative_polarity,
 521             synthetic,
 522             blanket_impl: blanket_impl.map(|x| (*x).into_tcx(tcx)),
 523         }
 524     }
 525 }
 526
 527 crate fn from_function_method(
 528     function: clean::Function,
 529     has_body: bool,
 530     tcx: TyCtxt<'_>,
 531 ) -> Method {
 532     let clean::Function { header, decl, generics } = function;
 533     Method {
 534         decl: decl.into_tcx(tcx),
 535         generics: generics.into_tcx(tcx),
 536         header: from_fn_header(&header),
 537         abi: header.abi.to_string(),
 538         has_body,
 539     }
 540 }
 541
 542 impl FromWithTcx<clean::Enum> for Enum {
 543     fn from_tcx(enum_: clean::Enum, tcx: TyCtxt<'_>) -> Self {
 544         let clean::Enum { variants, generics, variants_stripped } = enum_;
 545         Enum {
 546             generics: generics.into_tcx(tcx),
 547             variants_stripped,
 548             variants: ids(variants),
 549             impls: Vec::new(), // Added in JsonRenderer::item
 550         }
 551     }
 552 }
 553
 554 impl FromWithTcx<clean::VariantStruct> for Struct {
 555     fn from_tcx(struct_: clean::VariantStruct, _tcx: TyCtxt<'_>) -> Self {
 556         let clean::VariantStruct { struct_type, fields, fields_stripped } = struct_;
 557         Struct {
 558             struct_type: from_ctor_kind(struct_type),
 559             generics: Default::default(),
 560             fields_stripped,
 561             fields: ids(fields),
 562             impls: Vec::new(),
 563         }
 564     }
 565 }
 566
 567 impl FromWithTcx<clean::Variant> for Variant {
 568     fn from_tcx(variant: clean::Variant, tcx: TyCtxt<'_>) -> Self {
 569         use clean::Variant::*;
 570         match variant {
 571             CLike => Variant::Plain,
 572             Tuple(t) => Variant::Tuple(t.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 573             Struct(s) => Variant::Struct(ids(s.fields)),
 574         }
 575     }
 576 }
 577
 578 impl FromWithTcx<clean::Import> for Import {
 579     fn from_tcx(import: clean::Import, _tcx: TyCtxt<'_>) -> Self {
 580         use clean::ImportKind::*;
 581         match import.kind {
 582             Simple(s) => Import {
 583                 source: import.source.path.whole_name(),
 584                 name: s.to_string(),
 585                 id: import.source.did.map(ItemId::from).map(from_item_id),
 586                 glob: false,
 587             },
 588             Glob => Import {
 589                 source: import.source.path.whole_name(),
 590                 name: import.source.path.last_name().to_string(),
 591                 id: import.source.did.map(ItemId::from).map(from_item_id),
 592                 glob: true,
 593             },
 594         }
 595     }
 596 }
 597
 598 impl FromWithTcx<clean::ProcMacro> for ProcMacro {
 599     fn from_tcx(mac: clean::ProcMacro, _tcx: TyCtxt<'_>) -> Self {
 600         ProcMacro {
 601             kind: from_macro_kind(mac.kind),
 602             helpers: mac.helpers.iter().map(|x| x.to_string()).collect(),
 603         }
 604     }
 605 }
 606
 607 crate fn from_macro_kind(kind: rustc_span::hygiene::MacroKind) -> MacroKind {
 608     use rustc_span::hygiene::MacroKind::*;
 609     match kind {
 610         Bang => MacroKind::Bang,
 611         Attr => MacroKind::Attr,
 612         Derive => MacroKind::Derive,
 613     }
 614 }
 615
 616 impl FromWithTcx<clean::Typedef> for Typedef {
 617     fn from_tcx(typedef: clean::Typedef, tcx: TyCtxt<'_>) -> Self {
 618         let clean::Typedef { type_, generics, item_type: _ } = typedef;
 619         Typedef { type_: type_.into_tcx(tcx), generics: generics.into_tcx(tcx) }
 620     }
 621 }
 622
 623 impl FromWithTcx<clean::OpaqueTy> for OpaqueTy {
 624     fn from_tcx(opaque: clean::OpaqueTy, tcx: TyCtxt<'_>) -> Self {
 625         OpaqueTy {
 626             bounds: opaque.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 627             generics: opaque.generics.into_tcx(tcx),
 628         }
 629     }
 630 }
 631
 632 impl FromWithTcx<clean::Static> for Static {
 633     fn from_tcx(stat: clean::Static, tcx: TyCtxt<'_>) -> Self {
 634         Static {
 635             type_: stat.type_.into_tcx(tcx),
 636             mutable: stat.mutability == ast::Mutability::Mut,
 637             expr: stat.expr.map(|e| print_const_expr(tcx, e)).unwrap_or_default(),
 638         }
 639     }
 640 }
 641
 642 impl FromWithTcx<clean::TraitAlias> for TraitAlias {
 643     fn from_tcx(alias: clean::TraitAlias, tcx: TyCtxt<'_>) -> Self {
 644         TraitAlias {
 645             generics: alias.generics.into_tcx(tcx),
 646             params: alias.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 647         }
 648     }
 649 }
 650
 651 impl FromWithTcx<ItemType> for ItemKind {
 652     fn from_tcx(kind: ItemType, _tcx: TyCtxt<'_>) -> Self {
 653         use ItemType::*;
 654         match kind {
 655             Module => ItemKind::Module,
 656             ExternCrate => ItemKind::ExternCrate,
 657             Import => ItemKind::Import,
 658             Struct => ItemKind::Struct,
 659             Union => ItemKind::Union,
 660             Enum => ItemKind::Enum,
 661             Function => ItemKind::Function,
 662             Typedef => ItemKind::Typedef,
 663             OpaqueTy => ItemKind::OpaqueTy,
 664             Static => ItemKind::Static,
 665             Constant => ItemKind::Constant,
 666             Trait => ItemKind::Trait,
 667             Impl => ItemKind::Impl,
 668             TyMethod | Method => ItemKind::Method,
 669             StructField => ItemKind::StructField,
 670             Variant => ItemKind::Variant,
 671             Macro => ItemKind::Macro,
 672             Primitive => ItemKind::Primitive,
 673             AssocConst => ItemKind::AssocConst,
 674             AssocType => ItemKind::AssocType,
 675             ForeignType => ItemKind::ForeignType,
 676             Keyword => ItemKind::Keyword,
 677             TraitAlias => ItemKind::TraitAlias,
 678             ProcAttribute => ItemKind::ProcAttribute,
 679             ProcDerive => ItemKind::ProcDerive,
 680         }
 681     }
 682 }
 683
 684 fn ids(items: impl IntoIterator<Item = clean::Item>) -> Vec<Id> {
 685     items.into_iter().filter(|x| !x.is_stripped()).map(|i| from_item_id(i.def_id)).collect()
 686 }