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 use rustc_target::spec::abi::Abi as RustcAbi;
  16
  17 use rustdoc_json_types::*;
  18
  19 use crate::clean::utils::print_const_expr;
  20 use crate::clean::{self, ItemId};
  21 use crate::formats::item_type::ItemType;
  22 use crate::json::JsonRenderer;
  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 {
 158             name: binding.assoc.name.to_string(),
 159             args: binding.assoc.args.into_tcx(tcx),
 160             binding: binding.kind.into_tcx(tcx),
 161         }
 162     }
 163 }
 164
 165 impl FromWithTcx<clean::TypeBindingKind> for TypeBindingKind {
 166     fn from_tcx(kind: clean::TypeBindingKind, tcx: TyCtxt<'_>) -> Self {
 167         use clean::TypeBindingKind::*;
 168         match kind {
 169             Equality { term } => TypeBindingKind::Equality(term.into_tcx(tcx)),
 170             Constraint { bounds } => {
 171                 TypeBindingKind::Constraint(bounds.into_iter().map(|a| a.into_tcx(tcx)).collect())
 172             }
 173         }
 174     }
 175 }
 176
 177 crate fn from_item_id(did: ItemId) -> Id {
 178     struct DisplayDefId(DefId);
 179
 180     impl fmt::Display for DisplayDefId {
 181         fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 182             write!(f, "{}:{}", self.0.krate.as_u32(), u32::from(self.0.index))
 183         }
 184     }
 185
 186     match did {
 187         ItemId::DefId(did) => Id(format!("{}", DisplayDefId(did))),
 188         ItemId::Blanket { for_, impl_id } => {
 189             Id(format!("b:{}-{}", DisplayDefId(impl_id), DisplayDefId(for_)))
 190         }
 191         ItemId::Auto { for_, trait_ } => {
 192             Id(format!("a:{}-{}", DisplayDefId(trait_), DisplayDefId(for_)))
 193         }
 194         ItemId::Primitive(ty, krate) => Id(format!("p:{}:{}", krate.as_u32(), ty.as_sym())),
 195     }
 196 }
 197
 198 fn from_clean_item(item: clean::Item, tcx: TyCtxt<'_>) -> ItemEnum {
 199     use clean::ItemKind::*;
 200     let name = item.name;
 201     let is_crate = item.is_crate();
 202     match *item.kind {
 203         ModuleItem(m) => ItemEnum::Module(Module { is_crate, items: ids(m.items) }),
 204         ImportItem(i) => ItemEnum::Import(i.into_tcx(tcx)),
 205         StructItem(s) => ItemEnum::Struct(s.into_tcx(tcx)),
 206         UnionItem(u) => ItemEnum::Union(u.into_tcx(tcx)),
 207         StructFieldItem(f) => ItemEnum::StructField(f.into_tcx(tcx)),
 208         EnumItem(e) => ItemEnum::Enum(e.into_tcx(tcx)),
 209         VariantItem(v) => ItemEnum::Variant(v.into_tcx(tcx)),
 210         FunctionItem(f) => ItemEnum::Function(f.into_tcx(tcx)),
 211         ForeignFunctionItem(f) => ItemEnum::Function(f.into_tcx(tcx)),
 212         TraitItem(t) => ItemEnum::Trait(t.into_tcx(tcx)),
 213         TraitAliasItem(t) => ItemEnum::TraitAlias(t.into_tcx(tcx)),
 214         MethodItem(m, _) => ItemEnum::Method(from_function_method(m, true, tcx)),
 215         TyMethodItem(m) => ItemEnum::Method(from_function_method(m, false, tcx)),
 216         ImplItem(i) => ItemEnum::Impl(i.into_tcx(tcx)),
 217         StaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 218         ForeignStaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 219         ForeignTypeItem => ItemEnum::ForeignType,
 220         TypedefItem(t, _) => ItemEnum::Typedef(t.into_tcx(tcx)),
 221         OpaqueTyItem(t) => ItemEnum::OpaqueTy(t.into_tcx(tcx)),
 222         ConstantItem(c) => ItemEnum::Constant(c.into_tcx(tcx)),
 223         MacroItem(m) => ItemEnum::Macro(m.source),
 224         ProcMacroItem(m) => ItemEnum::ProcMacro(m.into_tcx(tcx)),
 225         PrimitiveItem(p) => ItemEnum::PrimitiveType(p.as_sym().to_string()),
 226         AssocConstItem(ty, default) => {
 227             ItemEnum::AssocConst { type_: ty.into_tcx(tcx), default: default.map(|c| c.expr(tcx)) }
 228         }
 229         AssocTypeItem(g, b, t) => ItemEnum::AssocType {
 230             generics: (*g).into_tcx(tcx),
 231             bounds: b.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 232             default: t.map(|x| x.into_tcx(tcx)),
 233         },
 234         // `convert_item` early returns `None` for striped items
 235         StrippedItem(_) => unreachable!(),
 236         KeywordItem(_) => {
 237             panic!("{:?} is not supported for JSON output", item)
 238         }
 239         ExternCrateItem { ref src } => ItemEnum::ExternCrate {
 240             name: name.as_ref().unwrap().to_string(),
 241             rename: src.map(|x| x.to_string()),
 242         },
 243     }
 244 }
 245
 246 impl FromWithTcx<clean::Struct> for Struct {
 247     fn from_tcx(struct_: clean::Struct, tcx: TyCtxt<'_>) -> Self {
 248         let clean::Struct { struct_type, generics, fields, fields_stripped } = struct_;
 249         Struct {
 250             struct_type: from_ctor_kind(struct_type),
 251             generics: generics.into_tcx(tcx),
 252             fields_stripped,
 253             fields: ids(fields),
 254             impls: Vec::new(), // Added in JsonRenderer::item
 255         }
 256     }
 257 }
 258
 259 impl FromWithTcx<clean::Union> for Union {
 260     fn from_tcx(struct_: clean::Union, tcx: TyCtxt<'_>) -> Self {
 261         let clean::Union { generics, fields, fields_stripped } = struct_;
 262         Union {
 263             generics: generics.into_tcx(tcx),
 264             fields_stripped,
 265             fields: ids(fields),
 266             impls: Vec::new(), // Added in JsonRenderer::item
 267         }
 268     }
 269 }
 270
 271 crate fn from_ctor_kind(struct_type: CtorKind) -> StructType {
 272     match struct_type {
 273         CtorKind::Fictive => StructType::Plain,
 274         CtorKind::Fn => StructType::Tuple,
 275         CtorKind::Const => StructType::Unit,
 276     }
 277 }
 278
 279 crate fn from_fn_header(header: &rustc_hir::FnHeader) -> Header {
 280     Header {
 281         async_: header.is_async(),
 282         const_: header.is_const(),
 283         unsafe_: header.is_unsafe(),
 284         abi: convert_abi(header.abi),
 285     }
 286 }
 287
 288 fn convert_abi(a: RustcAbi) -> Abi {
 289     match a {
 290         RustcAbi::Rust => Abi::Rust,
 291         RustcAbi::C { unwind } => Abi::C { unwind },
 292         RustcAbi::Cdecl { unwind } => Abi::Cdecl { unwind },
 293         RustcAbi::Stdcall { unwind } => Abi::Stdcall { unwind },
 294         RustcAbi::Fastcall { unwind } => Abi::Fastcall { unwind },
 295         RustcAbi::Aapcs { unwind } => Abi::Aapcs { unwind },
 296         RustcAbi::Win64 { unwind } => Abi::Win64 { unwind },
 297         RustcAbi::SysV64 { unwind } => Abi::SysV64 { unwind },
 298         RustcAbi::System { unwind } => Abi::System { unwind },
 299         _ => Abi::Other(a.to_string()),
 300     }
 301 }
 302
 303 impl FromWithTcx<clean::Function> for Function {
 304     fn from_tcx(function: clean::Function, tcx: TyCtxt<'_>) -> Self {
 305         let clean::Function { decl, generics, header } = function;
 306         Function {
 307             decl: decl.into_tcx(tcx),
 308             generics: generics.into_tcx(tcx),
 309             header: from_fn_header(&header),
 310         }
 311     }
 312 }
 313
 314 impl FromWithTcx<clean::Generics> for Generics {
 315     fn from_tcx(generics: clean::Generics, tcx: TyCtxt<'_>) -> Self {
 316         Generics {
 317             params: generics.params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 318             where_predicates: generics
 319                 .where_predicates
 320                 .into_iter()
 321                 .map(|x| x.into_tcx(tcx))
 322                 .collect(),
 323         }
 324     }
 325 }
 326
 327 impl FromWithTcx<clean::GenericParamDef> for GenericParamDef {
 328     fn from_tcx(generic_param: clean::GenericParamDef, tcx: TyCtxt<'_>) -> Self {
 329         GenericParamDef {
 330             name: generic_param.name.to_string(),
 331             kind: generic_param.kind.into_tcx(tcx),
 332         }
 333     }
 334 }
 335
 336 impl FromWithTcx<clean::GenericParamDefKind> for GenericParamDefKind {
 337     fn from_tcx(kind: clean::GenericParamDefKind, tcx: TyCtxt<'_>) -> Self {
 338         use clean::GenericParamDefKind::*;
 339         match kind {
 340             Lifetime { outlives } => GenericParamDefKind::Lifetime {
 341                 outlives: outlives.into_iter().map(|lt| lt.0.to_string()).collect(),
 342             },
 343             Type { did: _, bounds, default, synthetic: _ } => GenericParamDefKind::Type {
 344                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 345                 default: default.map(|x| (*x).into_tcx(tcx)),
 346             },
 347             Const { did: _, ty, default } => {
 348                 GenericParamDefKind::Const { ty: (*ty).into_tcx(tcx), default: default.map(|x| *x) }
 349             }
 350         }
 351     }
 352 }
 353
 354 impl FromWithTcx<clean::WherePredicate> for WherePredicate {
 355     fn from_tcx(predicate: clean::WherePredicate, tcx: TyCtxt<'_>) -> Self {
 356         use clean::WherePredicate::*;
 357         match predicate {
 358             BoundPredicate { ty, bounds, .. } => WherePredicate::BoundPredicate {
 359                 ty: ty.into_tcx(tcx),
 360                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 361                 // FIXME: add `bound_params` to rustdoc-json-params?
 362             },
 363             RegionPredicate { lifetime, bounds } => WherePredicate::RegionPredicate {
 364                 lifetime: lifetime.0.to_string(),
 365                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 366             },
 367             EqPredicate { lhs, rhs } => {
 368                 WherePredicate::EqPredicate { lhs: lhs.into_tcx(tcx), rhs: rhs.into_tcx(tcx) }
 369             }
 370         }
 371     }
 372 }
 373
 374 impl FromWithTcx<clean::GenericBound> for GenericBound {
 375     fn from_tcx(bound: clean::GenericBound, tcx: TyCtxt<'_>) -> Self {
 376         use clean::GenericBound::*;
 377         match bound {
 378             TraitBound(clean::PolyTrait { trait_, generic_params }, modifier) => {
 379                 // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 380                 let trait_ = clean::Type::Path { path: trait_ }.into_tcx(tcx);
 381                 GenericBound::TraitBound {
 382                     trait_,
 383                     generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 384                     modifier: from_trait_bound_modifier(modifier),
 385                 }
 386             }
 387             Outlives(lifetime) => GenericBound::Outlives(lifetime.0.to_string()),
 388         }
 389     }
 390 }
 391
 392 crate fn from_trait_bound_modifier(modifier: rustc_hir::TraitBoundModifier) -> TraitBoundModifier {
 393     use rustc_hir::TraitBoundModifier::*;
 394     match modifier {
 395         None => TraitBoundModifier::None,
 396         Maybe => TraitBoundModifier::Maybe,
 397         MaybeConst => TraitBoundModifier::MaybeConst,
 398     }
 399 }
 400
 401 impl FromWithTcx<clean::Type> for Type {
 402     fn from_tcx(ty: clean::Type, tcx: TyCtxt<'_>) -> Self {
 403         use clean::Type::{
 404             Array, BareFunction, BorrowedRef, DynTrait, Generic, ImplTrait, Infer, Primitive,
 405             QPath, RawPointer, Slice, Tuple,
 406         };
 407
 408         match ty {
 409             clean::Type::Path { path } => Type::ResolvedPath {
 410                 name: path.whole_name(),
 411                 id: from_item_id(path.def_id().into()),
 412                 args: path.segments.last().map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 413                 param_names: Vec::new(),
 414             },
 415             DynTrait(mut bounds, lt) => {
 416                 let first_trait = bounds.remove(0).trait_;
 417
 418                 Type::ResolvedPath {
 419                     name: first_trait.whole_name(),
 420                     id: from_item_id(first_trait.def_id().into()),
 421                     args: first_trait
 422                         .segments
 423                         .last()
 424                         .map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 425                     param_names: bounds
 426                         .into_iter()
 427                         .map(|t| {
 428                             clean::GenericBound::TraitBound(t, rustc_hir::TraitBoundModifier::None)
 429                         })
 430                         .chain(lt.map(clean::GenericBound::Outlives))
 431                         .map(|bound| bound.into_tcx(tcx))
 432                         .collect(),
 433                 }
 434             }
 435             Generic(s) => Type::Generic(s.to_string()),
 436             Primitive(p) => Type::Primitive(p.as_sym().to_string()),
 437             BareFunction(f) => Type::FunctionPointer(Box::new((*f).into_tcx(tcx))),
 438             Tuple(t) => Type::Tuple(t.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 439             Slice(t) => Type::Slice(Box::new((*t).into_tcx(tcx))),
 440             Array(t, s) => Type::Array { type_: Box::new((*t).into_tcx(tcx)), len: s },
 441             ImplTrait(g) => Type::ImplTrait(g.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 442             Infer => Type::Infer,
 443             RawPointer(mutability, type_) => Type::RawPointer {
 444                 mutable: mutability == ast::Mutability::Mut,
 445                 type_: Box::new((*type_).into_tcx(tcx)),
 446             },
 447             BorrowedRef { lifetime, mutability, type_ } => Type::BorrowedRef {
 448                 lifetime: lifetime.map(|l| l.0.to_string()),
 449                 mutable: mutability == ast::Mutability::Mut,
 450                 type_: Box::new((*type_).into_tcx(tcx)),
 451             },
 452             QPath { assoc, self_type, trait_, .. } => {
 453                 // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 454                 let trait_ = clean::Type::Path { path: trait_ }.into_tcx(tcx);
 455                 Type::QualifiedPath {
 456                     name: assoc.name.to_string(),
 457                     args: Box::new(assoc.args.clone().into_tcx(tcx)),
 458                     self_type: Box::new((*self_type).into_tcx(tcx)),
 459                     trait_: Box::new(trait_),
 460                 }
 461             }
 462         }
 463     }
 464 }
 465
 466 impl FromWithTcx<clean::Term> for Term {
 467     fn from_tcx(term: clean::Term, tcx: TyCtxt<'_>) -> Term {
 468         match term {
 469             clean::Term::Type(ty) => Term::Type(FromWithTcx::from_tcx(ty, tcx)),
 470             clean::Term::Constant(c) => Term::Constant(FromWithTcx::from_tcx(c, tcx)),
 471         }
 472     }
 473 }
 474
 475 impl FromWithTcx<clean::BareFunctionDecl> for FunctionPointer {
 476     fn from_tcx(bare_decl: clean::BareFunctionDecl, tcx: TyCtxt<'_>) -> Self {
 477         let clean::BareFunctionDecl { unsafety, generic_params, decl, abi } = bare_decl;
 478         FunctionPointer {
 479             header: Header {
 480                 unsafe_: matches!(unsafety, rustc_hir::Unsafety::Unsafe),
 481                 const_: false,
 482                 async_: false,
 483                 abi: convert_abi(abi),
 484             },
 485             generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 486             decl: decl.into_tcx(tcx),
 487         }
 488     }
 489 }
 490
 491 impl FromWithTcx<clean::FnDecl> for FnDecl {
 492     fn from_tcx(decl: clean::FnDecl, tcx: TyCtxt<'_>) -> Self {
 493         let clean::FnDecl { inputs, output, c_variadic } = decl;
 494         FnDecl {
 495             inputs: inputs
 496                 .values
 497                 .into_iter()
 498                 .map(|arg| (arg.name.to_string(), arg.type_.into_tcx(tcx)))
 499                 .collect(),
 500             output: match output {
 501                 clean::FnRetTy::Return(t) => Some(t.into_tcx(tcx)),
 502                 clean::FnRetTy::DefaultReturn => None,
 503             },
 504             c_variadic,
 505         }
 506     }
 507 }
 508
 509 impl FromWithTcx<clean::Trait> for Trait {
 510     fn from_tcx(trait_: clean::Trait, tcx: TyCtxt<'_>) -> Self {
 511         let clean::Trait { unsafety, items, generics, bounds, is_auto } = trait_;
 512         Trait {
 513             is_auto,
 514             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 515             items: ids(items),
 516             generics: generics.into_tcx(tcx),
 517             bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 518             implementors: Vec::new(), // Added in JsonRenderer::item
 519         }
 520     }
 521 }
 522
 523 impl FromWithTcx<clean::Impl> for Impl {
 524     fn from_tcx(impl_: clean::Impl, tcx: TyCtxt<'_>) -> Self {
 525         let provided_trait_methods = impl_.provided_trait_methods(tcx);
 526         let clean::Impl { unsafety, generics, trait_, for_, items, polarity, kind } = impl_;
 527         // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 528         let trait_ = trait_.map(|path| clean::Type::Path { path }.into_tcx(tcx));
 529         // FIXME: use something like ImplKind in JSON?
 530         let (synthetic, blanket_impl) = match kind {
 531             clean::ImplKind::Normal => (false, None),
 532             clean::ImplKind::Auto => (true, None),
 533             clean::ImplKind::Blanket(ty) => (false, Some(*ty)),
 534         };
 535         let negative_polarity = match polarity {
 536             ty::ImplPolarity::Positive | ty::ImplPolarity::Reservation => false,
 537             ty::ImplPolarity::Negative => true,
 538         };
 539         Impl {
 540             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 541             generics: generics.into_tcx(tcx),
 542             provided_trait_methods: provided_trait_methods
 543                 .into_iter()
 544                 .map(|x| x.to_string())
 545                 .collect(),
 546             trait_,
 547             for_: for_.into_tcx(tcx),
 548             items: ids(items),
 549             negative: negative_polarity,
 550             synthetic,
 551             blanket_impl: blanket_impl.map(|x| x.into_tcx(tcx)),
 552         }
 553     }
 554 }
 555
 556 crate fn from_function_method(
 557     function: clean::Function,
 558     has_body: bool,
 559     tcx: TyCtxt<'_>,
 560 ) -> Method {
 561     let clean::Function { header, decl, generics } = function;
 562     Method {
 563         decl: decl.into_tcx(tcx),
 564         generics: generics.into_tcx(tcx),
 565         header: from_fn_header(&header),
 566         has_body,
 567     }
 568 }
 569
 570 impl FromWithTcx<clean::Enum> for Enum {
 571     fn from_tcx(enum_: clean::Enum, tcx: TyCtxt<'_>) -> Self {
 572         let clean::Enum { variants, generics, variants_stripped } = enum_;
 573         Enum {
 574             generics: generics.into_tcx(tcx),
 575             variants_stripped,
 576             variants: ids(variants),
 577             impls: Vec::new(), // Added in JsonRenderer::item
 578         }
 579     }
 580 }
 581
 582 impl FromWithTcx<clean::VariantStruct> for Struct {
 583     fn from_tcx(struct_: clean::VariantStruct, _tcx: TyCtxt<'_>) -> Self {
 584         let clean::VariantStruct { struct_type, fields, fields_stripped } = struct_;
 585         Struct {
 586             struct_type: from_ctor_kind(struct_type),
 587             generics: Default::default(),
 588             fields_stripped,
 589             fields: ids(fields),
 590             impls: Vec::new(),
 591         }
 592     }
 593 }
 594
 595 impl FromWithTcx<clean::Variant> for Variant {
 596     fn from_tcx(variant: clean::Variant, tcx: TyCtxt<'_>) -> Self {
 597         use clean::Variant::*;
 598         match variant {
 599             CLike => Variant::Plain,
 600             Tuple(fields) => Variant::Tuple(
 601                 fields
 602                     .into_iter()
 603                     .map(|f| {
 604                         if let clean::StructFieldItem(ty) = *f.kind {
 605                             ty.into_tcx(tcx)
 606                         } else {
 607                             unreachable!()
 608                         }
 609                     })
 610                     .collect(),
 611             ),
 612             Struct(s) => Variant::Struct(ids(s.fields)),
 613         }
 614     }
 615 }
 616
 617 impl FromWithTcx<clean::Import> for Import {
 618     fn from_tcx(import: clean::Import, _tcx: TyCtxt<'_>) -> Self {
 619         use clean::ImportKind::*;
 620         match import.kind {
 621             Simple(s) => Import {
 622                 source: import.source.path.whole_name(),
 623                 name: s.to_string(),
 624                 id: import.source.did.map(ItemId::from).map(from_item_id),
 625                 glob: false,
 626             },
 627             Glob => Import {
 628                 source: import.source.path.whole_name(),
 629                 name: import.source.path.last().to_string(),
 630                 id: import.source.did.map(ItemId::from).map(from_item_id),
 631                 glob: true,
 632             },
 633         }
 634     }
 635 }
 636
 637 impl FromWithTcx<clean::ProcMacro> for ProcMacro {
 638     fn from_tcx(mac: clean::ProcMacro, _tcx: TyCtxt<'_>) -> Self {
 639         ProcMacro {
 640             kind: from_macro_kind(mac.kind),
 641             helpers: mac.helpers.iter().map(|x| x.to_string()).collect(),
 642         }
 643     }
 644 }
 645
 646 crate fn from_macro_kind(kind: rustc_span::hygiene::MacroKind) -> MacroKind {
 647     use rustc_span::hygiene::MacroKind::*;
 648     match kind {
 649         Bang => MacroKind::Bang,
 650         Attr => MacroKind::Attr,
 651         Derive => MacroKind::Derive,
 652     }
 653 }
 654
 655 impl FromWithTcx<clean::Typedef> for Typedef {
 656     fn from_tcx(typedef: clean::Typedef, tcx: TyCtxt<'_>) -> Self {
 657         let clean::Typedef { type_, generics, item_type: _ } = typedef;
 658         Typedef { type_: type_.into_tcx(tcx), generics: generics.into_tcx(tcx) }
 659     }
 660 }
 661
 662 impl FromWithTcx<clean::OpaqueTy> for OpaqueTy {
 663     fn from_tcx(opaque: clean::OpaqueTy, tcx: TyCtxt<'_>) -> Self {
 664         OpaqueTy {
 665             bounds: opaque.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 666             generics: opaque.generics.into_tcx(tcx),
 667         }
 668     }
 669 }
 670
 671 impl FromWithTcx<clean::Static> for Static {
 672     fn from_tcx(stat: clean::Static, tcx: TyCtxt<'_>) -> Self {
 673         Static {
 674             type_: stat.type_.into_tcx(tcx),
 675             mutable: stat.mutability == ast::Mutability::Mut,
 676             expr: stat.expr.map(|e| print_const_expr(tcx, e)).unwrap_or_default(),
 677         }
 678     }
 679 }
 680
 681 impl FromWithTcx<clean::TraitAlias> for TraitAlias {
 682     fn from_tcx(alias: clean::TraitAlias, tcx: TyCtxt<'_>) -> Self {
 683         TraitAlias {
 684             generics: alias.generics.into_tcx(tcx),
 685             params: alias.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 686         }
 687     }
 688 }
 689
 690 impl FromWithTcx<ItemType> for ItemKind {
 691     fn from_tcx(kind: ItemType, _tcx: TyCtxt<'_>) -> Self {
 692         use ItemType::*;
 693         match kind {
 694             Module => ItemKind::Module,
 695             ExternCrate => ItemKind::ExternCrate,
 696             Import => ItemKind::Import,
 697             Struct => ItemKind::Struct,
 698             Union => ItemKind::Union,
 699             Enum => ItemKind::Enum,
 700             Function => ItemKind::Function,
 701             Typedef => ItemKind::Typedef,
 702             OpaqueTy => ItemKind::OpaqueTy,
 703             Static => ItemKind::Static,
 704             Constant => ItemKind::Constant,
 705             Trait => ItemKind::Trait,
 706             Impl => ItemKind::Impl,
 707             TyMethod | Method => ItemKind::Method,
 708             StructField => ItemKind::StructField,
 709             Variant => ItemKind::Variant,
 710             Macro => ItemKind::Macro,
 711             Primitive => ItemKind::Primitive,
 712             AssocConst => ItemKind::AssocConst,
 713             AssocType => ItemKind::AssocType,
 714             ForeignType => ItemKind::ForeignType,
 715             Keyword => ItemKind::Keyword,
 716             TraitAlias => ItemKind::TraitAlias,
 717             ProcAttribute => ItemKind::ProcAttribute,
 718             ProcDerive => ItemKind::ProcDerive,
 719             Generic => unreachable!(),
 720         }
 721     }
 722 }
 723
 724 fn ids(items: impl IntoIterator<Item = clean::Item>) -> Vec<Id> {
 725     items.into_iter().filter(|x| !x.is_stripped()).map(|i| from_item_id(i.def_id)).collect()
 726 }