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