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             .map(|clean::ItemLink { link, did, .. }| (link.clone(), from_item_id((*did).into())))
  34             .collect();
  35         let docs = item.attrs.collapsed_doc_value();
  36         let attrs = item
  37             .attrs
  38             .other_attrs
  39             .iter()
  40             .map(rustc_ast_pretty::pprust::attribute_to_string)
  41             .collect();
  42         let span = item.span(self.tcx);
  43         let clean::Item { name, attrs: _, kind: _, visibility, def_id, cfg: _ } = item;
  44         let inner = match *item.kind {
  45             clean::StrippedItem(_) => return None,
  46             _ => from_clean_item(item, self.tcx),
  47         };
  48         Some(Item {
  49             id: from_item_id(def_id),
  50             crate_id: def_id.krate().as_u32(),
  51             name: name.map(|sym| sym.to_string()),
  52             span: self.convert_span(span),
  53             visibility: self.convert_visibility(visibility),
  54             docs,
  55             attrs,
  56             deprecation: deprecation.map(from_deprecation),
  57             inner,
  58             links,
  59         })
  60     }
  61
  62     fn convert_span(&self, span: clean::Span) -> Option<Span> {
  63         match span.filename(self.sess()) {
  64             rustc_span::FileName::Real(name) => {
  65                 if let Some(local_path) = name.into_local_path() {
  66                     let hi = span.hi(self.sess());
  67                     let lo = span.lo(self.sess());
  68                     Some(Span {
  69                         filename: local_path,
  70                         begin: (lo.line, lo.col.to_usize()),
  71                         end: (hi.line, hi.col.to_usize()),
  72                     })
  73                 } else {
  74                     None
  75                 }
  76             }
  77             _ => None,
  78         }
  79     }
  80
  81     fn convert_visibility(&self, v: clean::Visibility) -> Visibility {
  82         use clean::Visibility::*;
  83         match v {
  84             Public => Visibility::Public,
  85             Inherited => Visibility::Default,
  86             Restricted(did) if did.index == CRATE_DEF_INDEX => Visibility::Crate,
  87             Restricted(did) => Visibility::Restricted {
  88                 parent: from_item_id(did.into()),
  89                 path: self.tcx.def_path(did).to_string_no_crate_verbose(),
  90             },
  91         }
  92     }
  93 }
  94
  95 crate trait FromWithTcx<T> {
  96     fn from_tcx(f: T, tcx: TyCtxt<'_>) -> Self;
  97 }
  98
  99 crate trait IntoWithTcx<T> {
 100     fn into_tcx(self, tcx: TyCtxt<'_>) -> T;
 101 }
 102
 103 impl<T, U> IntoWithTcx<U> for T
 104 where
 105     U: FromWithTcx<T>,
 106 {
 107     fn into_tcx(self, tcx: TyCtxt<'_>) -> U {
 108         U::from_tcx(self, tcx)
 109     }
 110 }
 111
 112 crate fn from_deprecation(deprecation: rustc_attr::Deprecation) -> Deprecation {
 113     #[rustfmt::skip]
 114     let rustc_attr::Deprecation { since, note, is_since_rustc_version: _, suggestion: _ } = deprecation;
 115     Deprecation { since: since.map(|s| s.to_string()), note: note.map(|s| s.to_string()) }
 116 }
 117
 118 impl FromWithTcx<clean::GenericArgs> for GenericArgs {
 119     fn from_tcx(args: clean::GenericArgs, tcx: TyCtxt<'_>) -> Self {
 120         use clean::GenericArgs::*;
 121         match args {
 122             AngleBracketed { args, bindings } => GenericArgs::AngleBracketed {
 123                 args: args.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 124                 bindings: bindings.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 125             },
 126             Parenthesized { inputs, output } => GenericArgs::Parenthesized {
 127                 inputs: inputs.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 128                 output: output.map(|a| (*a).into_tcx(tcx)),
 129             },
 130         }
 131     }
 132 }
 133
 134 impl FromWithTcx<clean::GenericArg> for GenericArg {
 135     fn from_tcx(arg: clean::GenericArg, tcx: TyCtxt<'_>) -> Self {
 136         use clean::GenericArg::*;
 137         match arg {
 138             Lifetime(l) => GenericArg::Lifetime(l.0.to_string()),
 139             Type(t) => GenericArg::Type(t.into_tcx(tcx)),
 140             Const(box c) => GenericArg::Const(c.into_tcx(tcx)),
 141             Infer => GenericArg::Infer,
 142         }
 143     }
 144 }
 145
 146 impl FromWithTcx<clean::Constant> for Constant {
 147     fn from_tcx(constant: clean::Constant, tcx: TyCtxt<'_>) -> Self {
 148         let expr = constant.expr(tcx);
 149         let value = constant.value(tcx);
 150         let is_literal = constant.is_literal(tcx);
 151         Constant { type_: constant.type_.into_tcx(tcx), expr, value, is_literal }
 152     }
 153 }
 154
 155 impl FromWithTcx<clean::TypeBinding> for TypeBinding {
 156     fn from_tcx(binding: clean::TypeBinding, tcx: TyCtxt<'_>) -> Self {
 157         TypeBinding { name: binding.name.to_string(), binding: binding.kind.into_tcx(tcx) }
 158     }
 159 }
 160
 161 impl FromWithTcx<clean::TypeBindingKind> for TypeBindingKind {
 162     fn from_tcx(kind: clean::TypeBindingKind, tcx: TyCtxt<'_>) -> Self {
 163         use clean::TypeBindingKind::*;
 164         match kind {
 165             Equality { ty } => TypeBindingKind::Equality(ty.into_tcx(tcx)),
 166             Constraint { bounds } => {
 167                 TypeBindingKind::Constraint(bounds.into_iter().map(|a| a.into_tcx(tcx)).collect())
 168             }
 169         }
 170     }
 171 }
 172
 173 crate fn from_item_id(did: ItemId) -> Id {
 174     struct DisplayDefId(DefId);
 175
 176     impl fmt::Display for DisplayDefId {
 177         fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 178             write!(f, "{}:{}", self.0.krate.as_u32(), u32::from(self.0.index))
 179         }
 180     }
 181
 182     match did {
 183         ItemId::DefId(did) => Id(format!("{}", DisplayDefId(did))),
 184         ItemId::Blanket { for_, impl_id } => {
 185             Id(format!("b:{}-{}", DisplayDefId(impl_id), DisplayDefId(for_)))
 186         }
 187         ItemId::Auto { for_, trait_ } => {
 188             Id(format!("a:{}-{}", DisplayDefId(trait_), DisplayDefId(for_)))
 189         }
 190         ItemId::Primitive(ty, krate) => Id(format!("p:{}:{}", krate.as_u32(), ty.as_sym())),
 191     }
 192 }
 193
 194 fn from_clean_item(item: clean::Item, tcx: TyCtxt<'_>) -> ItemEnum {
 195     use clean::ItemKind::*;
 196     let name = item.name;
 197     let is_crate = item.is_crate();
 198     match *item.kind {
 199         ModuleItem(m) => ItemEnum::Module(Module { is_crate, items: ids(m.items) }),
 200         ImportItem(i) => ItemEnum::Import(i.into_tcx(tcx)),
 201         StructItem(s) => ItemEnum::Struct(s.into_tcx(tcx)),
 202         UnionItem(u) => ItemEnum::Union(u.into_tcx(tcx)),
 203         StructFieldItem(f) => ItemEnum::StructField(f.into_tcx(tcx)),
 204         EnumItem(e) => ItemEnum::Enum(e.into_tcx(tcx)),
 205         VariantItem(v) => ItemEnum::Variant(v.into_tcx(tcx)),
 206         FunctionItem(f) => ItemEnum::Function(f.into_tcx(tcx)),
 207         ForeignFunctionItem(f) => ItemEnum::Function(f.into_tcx(tcx)),
 208         TraitItem(t) => ItemEnum::Trait(t.into_tcx(tcx)),
 209         TraitAliasItem(t) => ItemEnum::TraitAlias(t.into_tcx(tcx)),
 210         MethodItem(m, _) => ItemEnum::Method(from_function_method(m, true, tcx)),
 211         TyMethodItem(m) => ItemEnum::Method(from_function_method(m, false, tcx)),
 212         ImplItem(i) => ItemEnum::Impl(i.into_tcx(tcx)),
 213         StaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 214         ForeignStaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 215         ForeignTypeItem => ItemEnum::ForeignType,
 216         TypedefItem(t, _) => ItemEnum::Typedef(t.into_tcx(tcx)),
 217         OpaqueTyItem(t) => ItemEnum::OpaqueTy(t.into_tcx(tcx)),
 218         ConstantItem(c) => ItemEnum::Constant(c.into_tcx(tcx)),
 219         MacroItem(m) => ItemEnum::Macro(m.source),
 220         ProcMacroItem(m) => ItemEnum::ProcMacro(m.into_tcx(tcx)),
 221         PrimitiveItem(p) => ItemEnum::PrimitiveType(p.as_sym().to_string()),
 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         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 { outlives } => GenericParamDefKind::Lifetime {
 329                 outlives: outlives.into_iter().map(|lt| lt.0.to_string()).collect(),
 330             },
 331             Type { did: _, bounds, default, synthetic: _ } => GenericParamDefKind::Type {
 332                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 333                 default: default.map(|x| x.into_tcx(tcx)),
 334             },
 335             Const { did: _, ty, default } => {
 336                 GenericParamDefKind::Const { ty: ty.into_tcx(tcx), default }
 337             }
 338         }
 339     }
 340 }
 341
 342 impl FromWithTcx<clean::WherePredicate> for WherePredicate {
 343     fn from_tcx(predicate: clean::WherePredicate, tcx: TyCtxt<'_>) -> Self {
 344         use clean::WherePredicate::*;
 345         match predicate {
 346             BoundPredicate { ty, bounds, .. } => WherePredicate::BoundPredicate {
 347                 ty: ty.into_tcx(tcx),
 348                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 349                 // FIXME: add `bound_params` to rustdoc-json-params?
 350             },
 351             RegionPredicate { lifetime, bounds } => WherePredicate::RegionPredicate {
 352                 lifetime: lifetime.0.to_string(),
 353                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 354             },
 355             EqPredicate { lhs, rhs } => {
 356                 WherePredicate::EqPredicate { lhs: lhs.into_tcx(tcx), rhs: rhs.into_tcx(tcx) }
 357             }
 358         }
 359     }
 360 }
 361
 362 impl FromWithTcx<clean::GenericBound> for GenericBound {
 363     fn from_tcx(bound: clean::GenericBound, tcx: TyCtxt<'_>) -> Self {
 364         use clean::GenericBound::*;
 365         match bound {
 366             TraitBound(clean::PolyTrait { trait_, generic_params }, modifier) => {
 367                 // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 368                 let trait_ =
 369                     clean::ResolvedPath { did: trait_.def_id(), path: trait_ }.into_tcx(tcx);
 370                 GenericBound::TraitBound {
 371                     trait_,
 372                     generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 373                     modifier: from_trait_bound_modifier(modifier),
 374                 }
 375             }
 376             Outlives(lifetime) => GenericBound::Outlives(lifetime.0.to_string()),
 377         }
 378     }
 379 }
 380
 381 crate fn from_trait_bound_modifier(modifier: rustc_hir::TraitBoundModifier) -> TraitBoundModifier {
 382     use rustc_hir::TraitBoundModifier::*;
 383     match modifier {
 384         None => TraitBoundModifier::None,
 385         Maybe => TraitBoundModifier::Maybe,
 386         MaybeConst => TraitBoundModifier::MaybeConst,
 387     }
 388 }
 389
 390 impl FromWithTcx<clean::Type> for Type {
 391     fn from_tcx(ty: clean::Type, tcx: TyCtxt<'_>) -> Self {
 392         use clean::Type::*;
 393         match ty {
 394             ResolvedPath { path, did } => Type::ResolvedPath {
 395                 name: path.whole_name(),
 396                 id: from_item_id(did.into()),
 397                 args: path.segments.last().map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 398                 param_names: Vec::new(),
 399             },
 400             DynTrait(mut bounds, lt) => {
 401                 let first_trait = bounds.remove(0).trait_;
 402
 403                 Type::ResolvedPath {
 404                     name: first_trait.whole_name(),
 405                     id: from_item_id(first_trait.def_id().into()),
 406                     args: first_trait
 407                         .segments
 408                         .last()
 409                         .map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 410                     param_names: bounds
 411                         .into_iter()
 412                         .map(|t| {
 413                             clean::GenericBound::TraitBound(t, rustc_hir::TraitBoundModifier::None)
 414                         })
 415                         .chain(lt.into_iter().map(|lt| clean::GenericBound::Outlives(lt)))
 416                         .map(|bound| bound.into_tcx(tcx))
 417                         .collect(),
 418                 }
 419             }
 420             Generic(s) => Type::Generic(s.to_string()),
 421             Primitive(p) => Type::Primitive(p.as_sym().to_string()),
 422             BareFunction(f) => Type::FunctionPointer(Box::new((*f).into_tcx(tcx))),
 423             Tuple(t) => Type::Tuple(t.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 424             Slice(t) => Type::Slice(Box::new((*t).into_tcx(tcx))),
 425             Array(t, s) => Type::Array { type_: Box::new((*t).into_tcx(tcx)), len: s },
 426             ImplTrait(g) => Type::ImplTrait(g.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 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_, .. } => {
 438                 // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 439                 let trait_ = ResolvedPath { did: trait_.def_id(), path: trait_ }.into_tcx(tcx);
 440                 Type::QualifiedPath {
 441                     name: name.to_string(),
 442                     self_type: Box::new((*self_type).into_tcx(tcx)),
 443                     trait_: Box::new(trait_),
 444                 }
 445             }
 446         }
 447     }
 448 }
 449
 450 impl FromWithTcx<clean::BareFunctionDecl> for FunctionPointer {
 451     fn from_tcx(bare_decl: clean::BareFunctionDecl, tcx: TyCtxt<'_>) -> Self {
 452         let clean::BareFunctionDecl { unsafety, generic_params, decl, abi } = bare_decl;
 453         FunctionPointer {
 454             header: if let rustc_hir::Unsafety::Unsafe = unsafety {
 455                 let mut hs = HashSet::new();
 456                 hs.insert(Qualifiers::Unsafe);
 457                 hs
 458             } else {
 459                 HashSet::new()
 460             },
 461             generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 462             decl: decl.into_tcx(tcx),
 463             abi: abi.to_string(),
 464         }
 465     }
 466 }
 467
 468 impl FromWithTcx<clean::FnDecl> for FnDecl {
 469     fn from_tcx(decl: clean::FnDecl, tcx: TyCtxt<'_>) -> Self {
 470         let clean::FnDecl { inputs, output, c_variadic } = decl;
 471         FnDecl {
 472             inputs: inputs
 473                 .values
 474                 .into_iter()
 475                 .map(|arg| (arg.name.to_string(), arg.type_.into_tcx(tcx)))
 476                 .collect(),
 477             output: match output {
 478                 clean::FnRetTy::Return(t) => Some(t.into_tcx(tcx)),
 479                 clean::FnRetTy::DefaultReturn => None,
 480             },
 481             c_variadic,
 482         }
 483     }
 484 }
 485
 486 impl FromWithTcx<clean::Trait> for Trait {
 487     fn from_tcx(trait_: clean::Trait, tcx: TyCtxt<'_>) -> Self {
 488         let clean::Trait { unsafety, items, generics, bounds, is_auto } = trait_;
 489         Trait {
 490             is_auto,
 491             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 492             items: ids(items),
 493             generics: generics.into_tcx(tcx),
 494             bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 495             implementors: Vec::new(), // Added in JsonRenderer::item
 496         }
 497     }
 498 }
 499
 500 impl FromWithTcx<clean::Impl> for Impl {
 501     fn from_tcx(impl_: clean::Impl, tcx: TyCtxt<'_>) -> Self {
 502         let provided_trait_methods = impl_.provided_trait_methods(tcx);
 503         let clean::Impl {
 504             unsafety,
 505             generics,
 506             trait_,
 507             for_,
 508             items,
 509             negative_polarity,
 510             synthetic,
 511             blanket_impl,
 512             span: _span,
 513         } = impl_;
 514         // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 515         let trait_ = trait_.map(|path| {
 516             let did = path.def_id();
 517             clean::ResolvedPath { path, did }.into_tcx(tcx)
 518         });
 519         Impl {
 520             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 521             generics: generics.into_tcx(tcx),
 522             provided_trait_methods: provided_trait_methods
 523                 .into_iter()
 524                 .map(|x| x.to_string())
 525                 .collect(),
 526             trait_,
 527             for_: for_.into_tcx(tcx),
 528             items: ids(items),
 529             negative: negative_polarity,
 530             synthetic,
 531             blanket_impl: blanket_impl.map(|x| (*x).into_tcx(tcx)),
 532         }
 533     }
 534 }
 535
 536 crate fn from_function_method(
 537     function: clean::Function,
 538     has_body: bool,
 539     tcx: TyCtxt<'_>,
 540 ) -> Method {
 541     let clean::Function { header, decl, generics } = function;
 542     Method {
 543         decl: decl.into_tcx(tcx),
 544         generics: generics.into_tcx(tcx),
 545         header: from_fn_header(&header),
 546         abi: header.abi.to_string(),
 547         has_body,
 548     }
 549 }
 550
 551 impl FromWithTcx<clean::Enum> for Enum {
 552     fn from_tcx(enum_: clean::Enum, tcx: TyCtxt<'_>) -> Self {
 553         let clean::Enum { variants, generics, variants_stripped } = enum_;
 554         Enum {
 555             generics: generics.into_tcx(tcx),
 556             variants_stripped,
 557             variants: ids(variants),
 558             impls: Vec::new(), // Added in JsonRenderer::item
 559         }
 560     }
 561 }
 562
 563 impl FromWithTcx<clean::VariantStruct> for Struct {
 564     fn from_tcx(struct_: clean::VariantStruct, _tcx: TyCtxt<'_>) -> Self {
 565         let clean::VariantStruct { struct_type, fields, fields_stripped } = struct_;
 566         Struct {
 567             struct_type: from_ctor_kind(struct_type),
 568             generics: Default::default(),
 569             fields_stripped,
 570             fields: ids(fields),
 571             impls: Vec::new(),
 572         }
 573     }
 574 }
 575
 576 impl FromWithTcx<clean::Variant> for Variant {
 577     fn from_tcx(variant: clean::Variant, tcx: TyCtxt<'_>) -> Self {
 578         use clean::Variant::*;
 579         match variant {
 580             CLike => Variant::Plain,
 581             Tuple(fields) => Variant::Tuple(
 582                 fields
 583                     .into_iter()
 584                     .map(|f| {
 585                         if let clean::StructFieldItem(ty) = *f.kind {
 586                             ty.into_tcx(tcx)
 587                         } else {
 588                             unreachable!()
 589                         }
 590                     })
 591                     .collect(),
 592             ),
 593             Struct(s) => Variant::Struct(ids(s.fields)),
 594         }
 595     }
 596 }
 597
 598 impl FromWithTcx<clean::Import> for Import {
 599     fn from_tcx(import: clean::Import, _tcx: TyCtxt<'_>) -> Self {
 600         use clean::ImportKind::*;
 601         match import.kind {
 602             Simple(s) => Import {
 603                 source: import.source.path.whole_name(),
 604                 name: s.to_string(),
 605                 id: import.source.did.map(ItemId::from).map(from_item_id),
 606                 glob: false,
 607             },
 608             Glob => Import {
 609                 source: import.source.path.whole_name(),
 610                 name: import.source.path.last_name().to_string(),
 611                 id: import.source.did.map(ItemId::from).map(from_item_id),
 612                 glob: true,
 613             },
 614         }
 615     }
 616 }
 617
 618 impl FromWithTcx<clean::ProcMacro> for ProcMacro {
 619     fn from_tcx(mac: clean::ProcMacro, _tcx: TyCtxt<'_>) -> Self {
 620         ProcMacro {
 621             kind: from_macro_kind(mac.kind),
 622             helpers: mac.helpers.iter().map(|x| x.to_string()).collect(),
 623         }
 624     }
 625 }
 626
 627 crate fn from_macro_kind(kind: rustc_span::hygiene::MacroKind) -> MacroKind {
 628     use rustc_span::hygiene::MacroKind::*;
 629     match kind {
 630         Bang => MacroKind::Bang,
 631         Attr => MacroKind::Attr,
 632         Derive => MacroKind::Derive,
 633     }
 634 }
 635
 636 impl FromWithTcx<clean::Typedef> for Typedef {
 637     fn from_tcx(typedef: clean::Typedef, tcx: TyCtxt<'_>) -> Self {
 638         let clean::Typedef { type_, generics, item_type: _ } = typedef;
 639         Typedef { type_: type_.into_tcx(tcx), generics: generics.into_tcx(tcx) }
 640     }
 641 }
 642
 643 impl FromWithTcx<clean::OpaqueTy> for OpaqueTy {
 644     fn from_tcx(opaque: clean::OpaqueTy, tcx: TyCtxt<'_>) -> Self {
 645         OpaqueTy {
 646             bounds: opaque.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 647             generics: opaque.generics.into_tcx(tcx),
 648         }
 649     }
 650 }
 651
 652 impl FromWithTcx<clean::Static> for Static {
 653     fn from_tcx(stat: clean::Static, tcx: TyCtxt<'_>) -> Self {
 654         Static {
 655             type_: stat.type_.into_tcx(tcx),
 656             mutable: stat.mutability == ast::Mutability::Mut,
 657             expr: stat.expr.map(|e| print_const_expr(tcx, e)).unwrap_or_default(),
 658         }
 659     }
 660 }
 661
 662 impl FromWithTcx<clean::TraitAlias> for TraitAlias {
 663     fn from_tcx(alias: clean::TraitAlias, tcx: TyCtxt<'_>) -> Self {
 664         TraitAlias {
 665             generics: alias.generics.into_tcx(tcx),
 666             params: alias.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 667         }
 668     }
 669 }
 670
 671 impl FromWithTcx<ItemType> for ItemKind {
 672     fn from_tcx(kind: ItemType, _tcx: TyCtxt<'_>) -> Self {
 673         use ItemType::*;
 674         match kind {
 675             Module => ItemKind::Module,
 676             ExternCrate => ItemKind::ExternCrate,
 677             Import => ItemKind::Import,
 678             Struct => ItemKind::Struct,
 679             Union => ItemKind::Union,
 680             Enum => ItemKind::Enum,
 681             Function => ItemKind::Function,
 682             Typedef => ItemKind::Typedef,
 683             OpaqueTy => ItemKind::OpaqueTy,
 684             Static => ItemKind::Static,
 685             Constant => ItemKind::Constant,
 686             Trait => ItemKind::Trait,
 687             Impl => ItemKind::Impl,
 688             TyMethod | Method => ItemKind::Method,
 689             StructField => ItemKind::StructField,
 690             Variant => ItemKind::Variant,
 691             Macro => ItemKind::Macro,
 692             Primitive => ItemKind::Primitive,
 693             AssocConst => ItemKind::AssocConst,
 694             AssocType => ItemKind::AssocType,
 695             ForeignType => ItemKind::ForeignType,
 696             Keyword => ItemKind::Keyword,
 697             TraitAlias => ItemKind::TraitAlias,
 698             ProcAttribute => ItemKind::ProcAttribute,
 699             ProcDerive => ItemKind::ProcDerive,
 700         }
 701     }
 702 }
 703
 704 fn ids(items: impl IntoIterator<Item = clean::Item>) -> Vec<Id> {
 705     items.into_iter().filter(|x| !x.is_stripped()).map(|i| from_item_id(i.def_id)).collect()
 706 }