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::{self, 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 { term } => TypeBindingKind::Equality(term.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(ty, default) => {
 223             ItemEnum::AssocConst { type_: ty.into_tcx(tcx), default: default.map(|c| c.expr(tcx)) }
 224         }
 225         AssocTypeItem(g, t) => ItemEnum::AssocType {
 226             bounds: g.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 227             default: t.map(|x| x.into_tcx(tcx)),
 228         },
 229         // `convert_item` early returns `None` for striped items
 230         StrippedItem(_) => unreachable!(),
 231         KeywordItem(_) => {
 232             panic!("{:?} is not supported for JSON output", item)
 233         }
 234         ExternCrateItem { ref src } => ItemEnum::ExternCrate {
 235             name: name.as_ref().unwrap().to_string(),
 236             rename: src.map(|x| x.to_string()),
 237         },
 238     }
 239 }
 240
 241 impl FromWithTcx<clean::Struct> for Struct {
 242     fn from_tcx(struct_: clean::Struct, tcx: TyCtxt<'_>) -> Self {
 243         let clean::Struct { struct_type, generics, fields, fields_stripped } = struct_;
 244         Struct {
 245             struct_type: from_ctor_kind(struct_type),
 246             generics: generics.into_tcx(tcx),
 247             fields_stripped,
 248             fields: ids(fields),
 249             impls: Vec::new(), // Added in JsonRenderer::item
 250         }
 251     }
 252 }
 253
 254 impl FromWithTcx<clean::Union> for Union {
 255     fn from_tcx(struct_: clean::Union, tcx: TyCtxt<'_>) -> Self {
 256         let clean::Union { generics, fields, fields_stripped } = struct_;
 257         Union {
 258             generics: generics.into_tcx(tcx),
 259             fields_stripped,
 260             fields: ids(fields),
 261             impls: Vec::new(), // Added in JsonRenderer::item
 262         }
 263     }
 264 }
 265
 266 crate fn from_ctor_kind(struct_type: CtorKind) -> StructType {
 267     match struct_type {
 268         CtorKind::Fictive => StructType::Plain,
 269         CtorKind::Fn => StructType::Tuple,
 270         CtorKind::Const => StructType::Unit,
 271     }
 272 }
 273
 274 crate fn from_fn_header(header: &rustc_hir::FnHeader) -> HashSet<Qualifiers> {
 275     let mut v = HashSet::new();
 276
 277     if let rustc_hir::Unsafety::Unsafe = header.unsafety {
 278         v.insert(Qualifiers::Unsafe);
 279     }
 280
 281     if let rustc_hir::IsAsync::Async = header.asyncness {
 282         v.insert(Qualifiers::Async);
 283     }
 284
 285     if let rustc_hir::Constness::Const = header.constness {
 286         v.insert(Qualifiers::Const);
 287     }
 288
 289     v
 290 }
 291
 292 impl FromWithTcx<clean::Function> for Function {
 293     fn from_tcx(function: clean::Function, tcx: TyCtxt<'_>) -> Self {
 294         let clean::Function { decl, generics, header } = function;
 295         Function {
 296             decl: decl.into_tcx(tcx),
 297             generics: generics.into_tcx(tcx),
 298             header: from_fn_header(&header),
 299             abi: header.abi.to_string(),
 300         }
 301     }
 302 }
 303
 304 impl FromWithTcx<clean::Generics> for Generics {
 305     fn from_tcx(generics: clean::Generics, tcx: TyCtxt<'_>) -> Self {
 306         Generics {
 307             params: generics.params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 308             where_predicates: generics
 309                 .where_predicates
 310                 .into_iter()
 311                 .map(|x| x.into_tcx(tcx))
 312                 .collect(),
 313         }
 314     }
 315 }
 316
 317 impl FromWithTcx<clean::GenericParamDef> for GenericParamDef {
 318     fn from_tcx(generic_param: clean::GenericParamDef, tcx: TyCtxt<'_>) -> Self {
 319         GenericParamDef {
 320             name: generic_param.name.to_string(),
 321             kind: generic_param.kind.into_tcx(tcx),
 322         }
 323     }
 324 }
 325
 326 impl FromWithTcx<clean::GenericParamDefKind> for GenericParamDefKind {
 327     fn from_tcx(kind: clean::GenericParamDefKind, tcx: TyCtxt<'_>) -> Self {
 328         use clean::GenericParamDefKind::*;
 329         match kind {
 330             Lifetime { outlives } => GenericParamDefKind::Lifetime {
 331                 outlives: outlives.into_iter().map(|lt| lt.0.to_string()).collect(),
 332             },
 333             Type { did: _, bounds, default, synthetic: _ } => GenericParamDefKind::Type {
 334                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 335                 default: default.map(|x| (*x).into_tcx(tcx)),
 336             },
 337             Const { did: _, ty, default } => {
 338                 GenericParamDefKind::Const { ty: (*ty).into_tcx(tcx), default: default.map(|x| *x) }
 339             }
 340         }
 341     }
 342 }
 343
 344 impl FromWithTcx<clean::WherePredicate> for WherePredicate {
 345     fn from_tcx(predicate: clean::WherePredicate, tcx: TyCtxt<'_>) -> Self {
 346         use clean::WherePredicate::*;
 347         match predicate {
 348             BoundPredicate { ty, bounds, .. } => WherePredicate::BoundPredicate {
 349                 ty: ty.into_tcx(tcx),
 350                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 351                 // FIXME: add `bound_params` to rustdoc-json-params?
 352             },
 353             RegionPredicate { lifetime, bounds } => WherePredicate::RegionPredicate {
 354                 lifetime: lifetime.0.to_string(),
 355                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 356             },
 357             EqPredicate { lhs, rhs } => {
 358                 WherePredicate::EqPredicate { lhs: lhs.into_tcx(tcx), rhs: rhs.into_tcx(tcx) }
 359             }
 360         }
 361     }
 362 }
 363
 364 impl FromWithTcx<clean::GenericBound> for GenericBound {
 365     fn from_tcx(bound: clean::GenericBound, tcx: TyCtxt<'_>) -> Self {
 366         use clean::GenericBound::*;
 367         match bound {
 368             TraitBound(clean::PolyTrait { trait_, generic_params }, modifier) => {
 369                 // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 370                 let trait_ = clean::Type::Path { path: trait_ }.into_tcx(tcx);
 371                 GenericBound::TraitBound {
 372                     trait_,
 373                     generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 374                     modifier: from_trait_bound_modifier(modifier),
 375                 }
 376             }
 377             Outlives(lifetime) => GenericBound::Outlives(lifetime.0.to_string()),
 378         }
 379     }
 380 }
 381
 382 crate fn from_trait_bound_modifier(modifier: rustc_hir::TraitBoundModifier) -> TraitBoundModifier {
 383     use rustc_hir::TraitBoundModifier::*;
 384     match modifier {
 385         None => TraitBoundModifier::None,
 386         Maybe => TraitBoundModifier::Maybe,
 387         MaybeConst => TraitBoundModifier::MaybeConst,
 388     }
 389 }
 390
 391 impl FromWithTcx<clean::Type> for Type {
 392     fn from_tcx(ty: clean::Type, tcx: TyCtxt<'_>) -> Self {
 393         use clean::Type::{
 394             Array, BareFunction, BorrowedRef, DynTrait, Generic, ImplTrait, Infer, Primitive,
 395             QPath, RawPointer, Slice, Tuple,
 396         };
 397
 398         match ty {
 399             clean::Type::Path { path } => Type::ResolvedPath {
 400                 name: path.whole_name(),
 401                 id: from_item_id(path.def_id().into()),
 402                 args: path.segments.last().map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 403                 param_names: Vec::new(),
 404             },
 405             DynTrait(mut bounds, lt) => {
 406                 let first_trait = bounds.remove(0).trait_;
 407
 408                 Type::ResolvedPath {
 409                     name: first_trait.whole_name(),
 410                     id: from_item_id(first_trait.def_id().into()),
 411                     args: first_trait
 412                         .segments
 413                         .last()
 414                         .map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 415                     param_names: bounds
 416                         .into_iter()
 417                         .map(|t| {
 418                             clean::GenericBound::TraitBound(t, rustc_hir::TraitBoundModifier::None)
 419                         })
 420                         .chain(lt.map(clean::GenericBound::Outlives))
 421                         .map(|bound| bound.into_tcx(tcx))
 422                         .collect(),
 423                 }
 424             }
 425             Generic(s) => Type::Generic(s.to_string()),
 426             Primitive(p) => Type::Primitive(p.as_sym().to_string()),
 427             BareFunction(f) => Type::FunctionPointer(Box::new((*f).into_tcx(tcx))),
 428             Tuple(t) => Type::Tuple(t.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 429             Slice(t) => Type::Slice(Box::new((*t).into_tcx(tcx))),
 430             Array(t, s) => Type::Array { type_: Box::new((*t).into_tcx(tcx)), len: s },
 431             ImplTrait(g) => Type::ImplTrait(g.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 432             Infer => Type::Infer,
 433             RawPointer(mutability, type_) => Type::RawPointer {
 434                 mutable: mutability == ast::Mutability::Mut,
 435                 type_: Box::new((*type_).into_tcx(tcx)),
 436             },
 437             BorrowedRef { lifetime, mutability, type_ } => Type::BorrowedRef {
 438                 lifetime: lifetime.map(|l| l.0.to_string()),
 439                 mutable: mutability == ast::Mutability::Mut,
 440                 type_: Box::new((*type_).into_tcx(tcx)),
 441             },
 442             QPath { name, self_type, trait_, .. } => {
 443                 // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 444                 let trait_ = clean::Type::Path { path: trait_ }.into_tcx(tcx);
 445                 Type::QualifiedPath {
 446                     name: name.to_string(),
 447                     self_type: Box::new((*self_type).into_tcx(tcx)),
 448                     trait_: Box::new(trait_),
 449                 }
 450             }
 451         }
 452     }
 453 }
 454
 455 impl FromWithTcx<clean::Term> for Term {
 456     fn from_tcx(term: clean::Term, tcx: TyCtxt<'_>) -> Term {
 457         match term {
 458             clean::Term::Type(ty) => Term::Type(FromWithTcx::from_tcx(ty, tcx)),
 459             clean::Term::Constant(c) => Term::Constant(FromWithTcx::from_tcx(c, tcx)),
 460         }
 461     }
 462 }
 463
 464 impl FromWithTcx<clean::BareFunctionDecl> for FunctionPointer {
 465     fn from_tcx(bare_decl: clean::BareFunctionDecl, tcx: TyCtxt<'_>) -> Self {
 466         let clean::BareFunctionDecl { unsafety, generic_params, decl, abi } = bare_decl;
 467         FunctionPointer {
 468             header: if let rustc_hir::Unsafety::Unsafe = unsafety {
 469                 let mut hs = HashSet::new();
 470                 hs.insert(Qualifiers::Unsafe);
 471                 hs
 472             } else {
 473                 HashSet::new()
 474             },
 475             generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 476             decl: decl.into_tcx(tcx),
 477             abi: abi.to_string(),
 478         }
 479     }
 480 }
 481
 482 impl FromWithTcx<clean::FnDecl> for FnDecl {
 483     fn from_tcx(decl: clean::FnDecl, tcx: TyCtxt<'_>) -> Self {
 484         let clean::FnDecl { inputs, output, c_variadic } = decl;
 485         FnDecl {
 486             inputs: inputs
 487                 .values
 488                 .into_iter()
 489                 .map(|arg| (arg.name.to_string(), arg.type_.into_tcx(tcx)))
 490                 .collect(),
 491             output: match output {
 492                 clean::FnRetTy::Return(t) => Some(t.into_tcx(tcx)),
 493                 clean::FnRetTy::DefaultReturn => None,
 494             },
 495             c_variadic,
 496         }
 497     }
 498 }
 499
 500 impl FromWithTcx<clean::Trait> for Trait {
 501     fn from_tcx(trait_: clean::Trait, tcx: TyCtxt<'_>) -> Self {
 502         let clean::Trait { unsafety, items, generics, bounds, is_auto } = trait_;
 503         Trait {
 504             is_auto,
 505             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 506             items: ids(items),
 507             generics: generics.into_tcx(tcx),
 508             bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 509             implementors: Vec::new(), // Added in JsonRenderer::item
 510         }
 511     }
 512 }
 513
 514 impl FromWithTcx<clean::Impl> for Impl {
 515     fn from_tcx(impl_: clean::Impl, tcx: TyCtxt<'_>) -> Self {
 516         let provided_trait_methods = impl_.provided_trait_methods(tcx);
 517         let clean::Impl { unsafety, generics, trait_, for_, items, polarity, kind } = impl_;
 518         // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 519         let trait_ = trait_.map(|path| clean::Type::Path { path }.into_tcx(tcx));
 520         // FIXME: use something like ImplKind in JSON?
 521         let (synthetic, blanket_impl) = match kind {
 522             clean::ImplKind::Normal => (false, None),
 523             clean::ImplKind::Auto => (true, None),
 524             clean::ImplKind::Blanket(ty) => (false, Some(*ty)),
 525         };
 526         let negative_polarity = match polarity {
 527             ty::ImplPolarity::Positive | ty::ImplPolarity::Reservation => false,
 528             ty::ImplPolarity::Negative => true,
 529         };
 530         Impl {
 531             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 532             generics: generics.into_tcx(tcx),
 533             provided_trait_methods: provided_trait_methods
 534                 .into_iter()
 535                 .map(|x| x.to_string())
 536                 .collect(),
 537             trait_,
 538             for_: for_.into_tcx(tcx),
 539             items: ids(items),
 540             negative: negative_polarity,
 541             synthetic,
 542             blanket_impl: blanket_impl.map(|x| x.into_tcx(tcx)),
 543         }
 544     }
 545 }
 546
 547 crate fn from_function_method(
 548     function: clean::Function,
 549     has_body: bool,
 550     tcx: TyCtxt<'_>,
 551 ) -> Method {
 552     let clean::Function { header, decl, generics } = function;
 553     Method {
 554         decl: decl.into_tcx(tcx),
 555         generics: generics.into_tcx(tcx),
 556         header: from_fn_header(&header),
 557         abi: header.abi.to_string(),
 558         has_body,
 559     }
 560 }
 561
 562 impl FromWithTcx<clean::Enum> for Enum {
 563     fn from_tcx(enum_: clean::Enum, tcx: TyCtxt<'_>) -> Self {
 564         let clean::Enum { variants, generics, variants_stripped } = enum_;
 565         Enum {
 566             generics: generics.into_tcx(tcx),
 567             variants_stripped,
 568             variants: ids(variants),
 569             impls: Vec::new(), // Added in JsonRenderer::item
 570         }
 571     }
 572 }
 573
 574 impl FromWithTcx<clean::VariantStruct> for Struct {
 575     fn from_tcx(struct_: clean::VariantStruct, _tcx: TyCtxt<'_>) -> Self {
 576         let clean::VariantStruct { struct_type, fields, fields_stripped } = struct_;
 577         Struct {
 578             struct_type: from_ctor_kind(struct_type),
 579             generics: Default::default(),
 580             fields_stripped,
 581             fields: ids(fields),
 582             impls: Vec::new(),
 583         }
 584     }
 585 }
 586
 587 impl FromWithTcx<clean::Variant> for Variant {
 588     fn from_tcx(variant: clean::Variant, tcx: TyCtxt<'_>) -> Self {
 589         use clean::Variant::*;
 590         match variant {
 591             CLike => Variant::Plain,
 592             Tuple(fields) => Variant::Tuple(
 593                 fields
 594                     .into_iter()
 595                     .map(|f| {
 596                         if let clean::StructFieldItem(ty) = *f.kind {
 597                             ty.into_tcx(tcx)
 598                         } else {
 599                             unreachable!()
 600                         }
 601                     })
 602                     .collect(),
 603             ),
 604             Struct(s) => Variant::Struct(ids(s.fields)),
 605         }
 606     }
 607 }
 608
 609 impl FromWithTcx<clean::Import> for Import {
 610     fn from_tcx(import: clean::Import, _tcx: TyCtxt<'_>) -> Self {
 611         use clean::ImportKind::*;
 612         match import.kind {
 613             Simple(s) => Import {
 614                 source: import.source.path.whole_name(),
 615                 name: s.to_string(),
 616                 id: import.source.did.map(ItemId::from).map(from_item_id),
 617                 glob: false,
 618             },
 619             Glob => Import {
 620                 source: import.source.path.whole_name(),
 621                 name: import.source.path.last().to_string(),
 622                 id: import.source.did.map(ItemId::from).map(from_item_id),
 623                 glob: true,
 624             },
 625         }
 626     }
 627 }
 628
 629 impl FromWithTcx<clean::ProcMacro> for ProcMacro {
 630     fn from_tcx(mac: clean::ProcMacro, _tcx: TyCtxt<'_>) -> Self {
 631         ProcMacro {
 632             kind: from_macro_kind(mac.kind),
 633             helpers: mac.helpers.iter().map(|x| x.to_string()).collect(),
 634         }
 635     }
 636 }
 637
 638 crate fn from_macro_kind(kind: rustc_span::hygiene::MacroKind) -> MacroKind {
 639     use rustc_span::hygiene::MacroKind::*;
 640     match kind {
 641         Bang => MacroKind::Bang,
 642         Attr => MacroKind::Attr,
 643         Derive => MacroKind::Derive,
 644     }
 645 }
 646
 647 impl FromWithTcx<clean::Typedef> for Typedef {
 648     fn from_tcx(typedef: clean::Typedef, tcx: TyCtxt<'_>) -> Self {
 649         let clean::Typedef { type_, generics, item_type: _ } = typedef;
 650         Typedef { type_: type_.into_tcx(tcx), generics: generics.into_tcx(tcx) }
 651     }
 652 }
 653
 654 impl FromWithTcx<clean::OpaqueTy> for OpaqueTy {
 655     fn from_tcx(opaque: clean::OpaqueTy, tcx: TyCtxt<'_>) -> Self {
 656         OpaqueTy {
 657             bounds: opaque.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 658             generics: opaque.generics.into_tcx(tcx),
 659         }
 660     }
 661 }
 662
 663 impl FromWithTcx<clean::Static> for Static {
 664     fn from_tcx(stat: clean::Static, tcx: TyCtxt<'_>) -> Self {
 665         Static {
 666             type_: stat.type_.into_tcx(tcx),
 667             mutable: stat.mutability == ast::Mutability::Mut,
 668             expr: stat.expr.map(|e| print_const_expr(tcx, e)).unwrap_or_default(),
 669         }
 670     }
 671 }
 672
 673 impl FromWithTcx<clean::TraitAlias> for TraitAlias {
 674     fn from_tcx(alias: clean::TraitAlias, tcx: TyCtxt<'_>) -> Self {
 675         TraitAlias {
 676             generics: alias.generics.into_tcx(tcx),
 677             params: alias.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 678         }
 679     }
 680 }
 681
 682 impl FromWithTcx<ItemType> for ItemKind {
 683     fn from_tcx(kind: ItemType, _tcx: TyCtxt<'_>) -> Self {
 684         use ItemType::*;
 685         match kind {
 686             Module => ItemKind::Module,
 687             ExternCrate => ItemKind::ExternCrate,
 688             Import => ItemKind::Import,
 689             Struct => ItemKind::Struct,
 690             Union => ItemKind::Union,
 691             Enum => ItemKind::Enum,
 692             Function => ItemKind::Function,
 693             Typedef => ItemKind::Typedef,
 694             OpaqueTy => ItemKind::OpaqueTy,
 695             Static => ItemKind::Static,
 696             Constant => ItemKind::Constant,
 697             Trait => ItemKind::Trait,
 698             Impl => ItemKind::Impl,
 699             TyMethod | Method => ItemKind::Method,
 700             StructField => ItemKind::StructField,
 701             Variant => ItemKind::Variant,
 702             Macro => ItemKind::Macro,
 703             Primitive => ItemKind::Primitive,
 704             AssocConst => ItemKind::AssocConst,
 705             AssocType => ItemKind::AssocType,
 706             ForeignType => ItemKind::ForeignType,
 707             Keyword => ItemKind::Keyword,
 708             TraitAlias => ItemKind::TraitAlias,
 709             ProcAttribute => ItemKind::ProcAttribute,
 710             ProcDerive => ItemKind::ProcDerive,
 711             Generic => unreachable!(),
 712         }
 713     }
 714 }
 715
 716 fn ids(items: impl IntoIterator<Item = clean::Item>) -> Vec<Id> {
 717     items.into_iter().filter(|x| !x.is_stripped()).map(|i| from_item_id(i.def_id)).collect()
 718 }