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::{Pos, Symbol};
  14 use rustc_target::spec::abi::Abi as RustcAbi;
  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
  23 impl JsonRenderer<'_> {
  24     pub(super) fn convert_item(&self, item: clean::Item) -> Option<Item> {
  25         let deprecation = item.deprecation(self.tcx);
  26         let links = self
  27             .cache
  28             .intra_doc_links
  29             .get(&item.item_id)
  30             .into_iter()
  31             .flatten()
  32             .map(|clean::ItemLink { link, did, .. }| {
  33                 (link.clone(), from_item_id((*did).into(), self.tcx))
  34             })
  35             .collect();
  36         let docs = item.attrs.collapsed_doc_value();
  37         let attrs = item
  38             .attrs
  39             .other_attrs
  40             .iter()
  41             .map(rustc_ast_pretty::pprust::attribute_to_string)
  42             .collect();
  43         let span = item.span(self.tcx);
  44         let clean::Item { name, attrs: _, kind: _, visibility, item_id, cfg: _ } = item;
  45         let inner = match *item.kind {
  46             clean::StrippedItem(_) | clean::KeywordItem(_) => return None,
  47             _ => from_clean_item(item, self.tcx),
  48         };
  49         Some(Item {
  50             id: from_item_id_with_name(item_id, self.tcx, name),
  51             crate_id: item_id.krate().as_u32(),
  52             name: name.map(|sym| sym.to_string()),
  53             span: self.convert_span(span),
  54             visibility: self.convert_visibility(visibility),
  55             docs,
  56             attrs,
  57             deprecation: deprecation.map(from_deprecation),
  58             inner,
  59             links,
  60         })
  61     }
  62
  63     fn convert_span(&self, span: clean::Span) -> Option<Span> {
  64         match span.filename(self.sess()) {
  65             rustc_span::FileName::Real(name) => {
  66                 if let Some(local_path) = name.into_local_path() {
  67                     let hi = span.hi(self.sess());
  68                     let lo = span.lo(self.sess());
  69                     Some(Span {
  70                         filename: local_path,
  71                         begin: (lo.line, lo.col.to_usize()),
  72                         end: (hi.line, hi.col.to_usize()),
  73                     })
  74                 } else {
  75                     None
  76                 }
  77             }
  78             _ => None,
  79         }
  80     }
  81
  82     fn convert_visibility(&self, v: clean::Visibility) -> Visibility {
  83         use clean::Visibility::*;
  84         match v {
  85             Public => Visibility::Public,
  86             Inherited => Visibility::Default,
  87             Restricted(did) if did.is_crate_root() => Visibility::Crate,
  88             Restricted(did) => Visibility::Restricted {
  89                 parent: from_item_id(did.into(), self.tcx),
  90                 path: self.tcx.def_path(did).to_string_no_crate_verbose(),
  91             },
  92         }
  93     }
  94 }
  95
  96 pub(crate) trait FromWithTcx<T> {
  97     fn from_tcx(f: T, tcx: TyCtxt<'_>) -> Self;
  98 }
  99
 100 pub(crate) trait IntoWithTcx<T> {
 101     fn into_tcx(self, tcx: TyCtxt<'_>) -> T;
 102 }
 103
 104 impl<T, U> IntoWithTcx<U> for T
 105 where
 106     U: FromWithTcx<T>,
 107 {
 108     fn into_tcx(self, tcx: TyCtxt<'_>) -> U {
 109         U::from_tcx(self, tcx)
 110     }
 111 }
 112
 113 pub(crate) fn from_deprecation(deprecation: rustc_attr::Deprecation) -> Deprecation {
 114     #[rustfmt::skip]
 115     let rustc_attr::Deprecation { since, note, is_since_rustc_version: _, suggestion: _ } = deprecation;
 116     Deprecation { since: since.map(|s| s.to_string()), note: note.map(|s| s.to_string()) }
 117 }
 118
 119 impl FromWithTcx<clean::GenericArgs> for GenericArgs {
 120     fn from_tcx(args: clean::GenericArgs, tcx: TyCtxt<'_>) -> Self {
 121         use clean::GenericArgs::*;
 122         match args {
 123             AngleBracketed { args, bindings } => GenericArgs::AngleBracketed {
 124                 args: args.into_vec().into_iter().map(|a| a.into_tcx(tcx)).collect(),
 125                 bindings: bindings.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 126             },
 127             Parenthesized { inputs, output } => GenericArgs::Parenthesized {
 128                 inputs: inputs.into_vec().into_iter().map(|a| a.into_tcx(tcx)).collect(),
 129                 output: output.map(|a| (*a).into_tcx(tcx)),
 130             },
 131         }
 132     }
 133 }
 134
 135 impl FromWithTcx<clean::GenericArg> for GenericArg {
 136     fn from_tcx(arg: clean::GenericArg, tcx: TyCtxt<'_>) -> Self {
 137         use clean::GenericArg::*;
 138         match arg {
 139             Lifetime(l) => GenericArg::Lifetime(l.0.to_string()),
 140             Type(t) => GenericArg::Type(t.into_tcx(tcx)),
 141             Const(box c) => GenericArg::Const(c.into_tcx(tcx)),
 142             Infer => GenericArg::Infer,
 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 {
 159             name: binding.assoc.name.to_string(),
 160             args: binding.assoc.args.into_tcx(tcx),
 161             binding: binding.kind.into_tcx(tcx),
 162         }
 163     }
 164 }
 165
 166 impl FromWithTcx<clean::TypeBindingKind> for TypeBindingKind {
 167     fn from_tcx(kind: clean::TypeBindingKind, tcx: TyCtxt<'_>) -> Self {
 168         use clean::TypeBindingKind::*;
 169         match kind {
 170             Equality { term } => TypeBindingKind::Equality(term.into_tcx(tcx)),
 171             Constraint { bounds } => {
 172                 TypeBindingKind::Constraint(bounds.into_iter().map(|a| a.into_tcx(tcx)).collect())
 173             }
 174         }
 175     }
 176 }
 177
 178 /// It generates an ID as follows:
 179 ///
 180 /// `CRATE_ID:ITEM_ID[:NAME_ID]` (if there is no name, NAME_ID is not generated).
 181 pub(crate) fn from_item_id(item_id: ItemId, tcx: TyCtxt<'_>) -> Id {
 182     from_item_id_with_name(item_id, tcx, None)
 183 }
 184
 185 // FIXME: this function (and appending the name at the end of the ID) should be removed when
 186 // reexports are not inlined anymore for json format. It should be done in #93518.
 187 pub(crate) fn from_item_id_with_name(item_id: ItemId, tcx: TyCtxt<'_>, name: Option<Symbol>) -> Id {
 188     struct DisplayDefId<'a>(DefId, TyCtxt<'a>, Option<Symbol>);
 189
 190     impl<'a> fmt::Display for DisplayDefId<'a> {
 191         fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 192             let name = match self.2 {
 193                 Some(name) => format!(":{}", name.as_u32()),
 194                 None => self
 195                     .1
 196                     .opt_item_name(self.0)
 197                     .map(|n| format!(":{}", n.as_u32()))
 198                     .unwrap_or_default(),
 199             };
 200             write!(f, "{}:{}{}", self.0.krate.as_u32(), u32::from(self.0.index), name)
 201         }
 202     }
 203
 204     match item_id {
 205         ItemId::DefId(did) => Id(format!("{}", DisplayDefId(did, tcx, name))),
 206         ItemId::Blanket { for_, impl_id } => {
 207             Id(format!("b:{}-{}", DisplayDefId(impl_id, tcx, None), DisplayDefId(for_, tcx, name)))
 208         }
 209         ItemId::Auto { for_, trait_ } => {
 210             Id(format!("a:{}-{}", DisplayDefId(trait_, tcx, None), DisplayDefId(for_, tcx, name)))
 211         }
 212         ItemId::Primitive(ty, krate) => Id(format!("p:{}:{}", krate.as_u32(), ty.as_sym())),
 213     }
 214 }
 215
 216 fn from_clean_item(item: clean::Item, tcx: TyCtxt<'_>) -> ItemEnum {
 217     use clean::ItemKind::*;
 218     let name = item.name;
 219     let is_crate = item.is_crate();
 220     let header = item.fn_header(tcx);
 221
 222     match *item.kind {
 223         ModuleItem(m) => ItemEnum::Module(Module { is_crate, items: ids(m.items, tcx) }),
 224         ImportItem(i) => ItemEnum::Import(i.into_tcx(tcx)),
 225         StructItem(s) => ItemEnum::Struct(s.into_tcx(tcx)),
 226         UnionItem(u) => ItemEnum::Union(u.into_tcx(tcx)),
 227         StructFieldItem(f) => ItemEnum::StructField(f.into_tcx(tcx)),
 228         EnumItem(e) => ItemEnum::Enum(e.into_tcx(tcx)),
 229         VariantItem(v) => ItemEnum::Variant(v.into_tcx(tcx)),
 230         FunctionItem(f) => ItemEnum::Function(from_function(f, header.unwrap(), tcx)),
 231         ForeignFunctionItem(f) => ItemEnum::Function(from_function(f, header.unwrap(), tcx)),
 232         TraitItem(t) => ItemEnum::Trait(t.into_tcx(tcx)),
 233         TraitAliasItem(t) => ItemEnum::TraitAlias(t.into_tcx(tcx)),
 234         MethodItem(m, _) => ItemEnum::Method(from_function_method(m, true, header.unwrap(), tcx)),
 235         TyMethodItem(m) => ItemEnum::Method(from_function_method(m, false, header.unwrap(), tcx)),
 236         ImplItem(i) => ItemEnum::Impl(i.into_tcx(tcx)),
 237         StaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 238         ForeignStaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 239         ForeignTypeItem => ItemEnum::ForeignType,
 240         TypedefItem(t) => ItemEnum::Typedef(t.into_tcx(tcx)),
 241         OpaqueTyItem(t) => ItemEnum::OpaqueTy(t.into_tcx(tcx)),
 242         ConstantItem(c) => ItemEnum::Constant(c.into_tcx(tcx)),
 243         MacroItem(m) => ItemEnum::Macro(m.source),
 244         ProcMacroItem(m) => ItemEnum::ProcMacro(m.into_tcx(tcx)),
 245         PrimitiveItem(p) => ItemEnum::PrimitiveType(p.as_sym().to_string()),
 246         TyAssocConstItem(ty) => ItemEnum::AssocConst { type_: ty.into_tcx(tcx), default: None },
 247         AssocConstItem(ty, default) => {
 248             ItemEnum::AssocConst { type_: ty.into_tcx(tcx), default: Some(default.expr(tcx)) }
 249         }
 250         TyAssocTypeItem(g, b) => ItemEnum::AssocType {
 251             generics: (*g).into_tcx(tcx),
 252             bounds: b.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 253             default: None,
 254         },
 255         // FIXME: do not map to Typedef but to a custom variant
 256         AssocTypeItem(t, _) => ItemEnum::Typedef(t.into_tcx(tcx)),
 257         // `convert_item` early returns `None` for striped items and keywords.
 258         StrippedItem(_) | KeywordItem(_) => unreachable!(),
 259         ExternCrateItem { ref src } => ItemEnum::ExternCrate {
 260             name: name.as_ref().unwrap().to_string(),
 261             rename: src.map(|x| x.to_string()),
 262         },
 263     }
 264 }
 265
 266 impl FromWithTcx<clean::Struct> for Struct {
 267     fn from_tcx(struct_: clean::Struct, tcx: TyCtxt<'_>) -> Self {
 268         let fields_stripped = struct_.has_stripped_entries();
 269         let clean::Struct { struct_type, generics, fields } = struct_;
 270         Struct {
 271             struct_type: from_ctor_kind(struct_type),
 272             generics: generics.into_tcx(tcx),
 273             fields_stripped,
 274             fields: ids(fields, tcx),
 275             impls: Vec::new(), // Added in JsonRenderer::item
 276         }
 277     }
 278 }
 279
 280 impl FromWithTcx<clean::Union> for Union {
 281     fn from_tcx(union_: clean::Union, tcx: TyCtxt<'_>) -> Self {
 282         let fields_stripped = union_.has_stripped_entries();
 283         let clean::Union { generics, fields } = union_;
 284         Union {
 285             generics: generics.into_tcx(tcx),
 286             fields_stripped,
 287             fields: ids(fields, tcx),
 288             impls: Vec::new(), // Added in JsonRenderer::item
 289         }
 290     }
 291 }
 292
 293 pub(crate) fn from_ctor_kind(struct_type: CtorKind) -> StructType {
 294     match struct_type {
 295         CtorKind::Fictive => StructType::Plain,
 296         CtorKind::Fn => StructType::Tuple,
 297         CtorKind::Const => StructType::Unit,
 298     }
 299 }
 300
 301 pub(crate) fn from_fn_header(header: &rustc_hir::FnHeader) -> Header {
 302     Header {
 303         async_: header.is_async(),
 304         const_: header.is_const(),
 305         unsafe_: header.is_unsafe(),
 306         abi: convert_abi(header.abi),
 307     }
 308 }
 309
 310 fn convert_abi(a: RustcAbi) -> Abi {
 311     match a {
 312         RustcAbi::Rust => Abi::Rust,
 313         RustcAbi::C { unwind } => Abi::C { unwind },
 314         RustcAbi::Cdecl { unwind } => Abi::Cdecl { unwind },
 315         RustcAbi::Stdcall { unwind } => Abi::Stdcall { unwind },
 316         RustcAbi::Fastcall { unwind } => Abi::Fastcall { unwind },
 317         RustcAbi::Aapcs { unwind } => Abi::Aapcs { unwind },
 318         RustcAbi::Win64 { unwind } => Abi::Win64 { unwind },
 319         RustcAbi::SysV64 { unwind } => Abi::SysV64 { unwind },
 320         RustcAbi::System { unwind } => Abi::System { unwind },
 321         _ => Abi::Other(a.to_string()),
 322     }
 323 }
 324
 325 impl FromWithTcx<clean::Generics> for Generics {
 326     fn from_tcx(generics: clean::Generics, tcx: TyCtxt<'_>) -> Self {
 327         Generics {
 328             params: generics.params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 329             where_predicates: generics
 330                 .where_predicates
 331                 .into_iter()
 332                 .map(|x| x.into_tcx(tcx))
 333                 .collect(),
 334         }
 335     }
 336 }
 337
 338 impl FromWithTcx<clean::GenericParamDef> for GenericParamDef {
 339     fn from_tcx(generic_param: clean::GenericParamDef, tcx: TyCtxt<'_>) -> Self {
 340         GenericParamDef {
 341             name: generic_param.name.to_string(),
 342             kind: generic_param.kind.into_tcx(tcx),
 343         }
 344     }
 345 }
 346
 347 impl FromWithTcx<clean::GenericParamDefKind> for GenericParamDefKind {
 348     fn from_tcx(kind: clean::GenericParamDefKind, tcx: TyCtxt<'_>) -> Self {
 349         use clean::GenericParamDefKind::*;
 350         match kind {
 351             Lifetime { outlives } => GenericParamDefKind::Lifetime {
 352                 outlives: outlives.into_iter().map(|lt| lt.0.to_string()).collect(),
 353             },
 354             Type { did: _, bounds, default, synthetic } => GenericParamDefKind::Type {
 355                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 356                 default: default.map(|x| (*x).into_tcx(tcx)),
 357                 synthetic,
 358             },
 359             Const { did: _, ty, default } => GenericParamDefKind::Const {
 360                 type_: (*ty).into_tcx(tcx),
 361                 default: default.map(|x| *x),
 362             },
 363         }
 364     }
 365 }
 366
 367 impl FromWithTcx<clean::WherePredicate> for WherePredicate {
 368     fn from_tcx(predicate: clean::WherePredicate, tcx: TyCtxt<'_>) -> Self {
 369         use clean::WherePredicate::*;
 370         match predicate {
 371             BoundPredicate { ty, bounds, bound_params } => WherePredicate::BoundPredicate {
 372                 type_: ty.into_tcx(tcx),
 373                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 374                 generic_params: bound_params
 375                     .into_iter()
 376                     .map(|x| GenericParamDef {
 377                         name: x.0.to_string(),
 378                         kind: GenericParamDefKind::Lifetime { outlives: vec![] },
 379                     })
 380                     .collect(),
 381             },
 382             RegionPredicate { lifetime, bounds } => WherePredicate::RegionPredicate {
 383                 lifetime: lifetime.0.to_string(),
 384                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 385             },
 386             EqPredicate { lhs, rhs } => {
 387                 WherePredicate::EqPredicate { lhs: lhs.into_tcx(tcx), rhs: rhs.into_tcx(tcx) }
 388             }
 389         }
 390     }
 391 }
 392
 393 impl FromWithTcx<clean::GenericBound> for GenericBound {
 394     fn from_tcx(bound: clean::GenericBound, tcx: TyCtxt<'_>) -> Self {
 395         use clean::GenericBound::*;
 396         match bound {
 397             TraitBound(clean::PolyTrait { trait_, generic_params }, modifier) => {
 398                 // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 399                 let trait_ = clean::Type::Path { path: trait_ }.into_tcx(tcx);
 400                 GenericBound::TraitBound {
 401                     trait_,
 402                     generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 403                     modifier: from_trait_bound_modifier(modifier),
 404                 }
 405             }
 406             Outlives(lifetime) => GenericBound::Outlives(lifetime.0.to_string()),
 407         }
 408     }
 409 }
 410
 411 pub(crate) fn from_trait_bound_modifier(
 412     modifier: rustc_hir::TraitBoundModifier,
 413 ) -> TraitBoundModifier {
 414     use rustc_hir::TraitBoundModifier::*;
 415     match modifier {
 416         None => TraitBoundModifier::None,
 417         Maybe => TraitBoundModifier::Maybe,
 418         MaybeConst => TraitBoundModifier::MaybeConst,
 419     }
 420 }
 421
 422 impl FromWithTcx<clean::Type> for Type {
 423     fn from_tcx(ty: clean::Type, tcx: TyCtxt<'_>) -> Self {
 424         use clean::Type::{
 425             Array, BareFunction, BorrowedRef, DynTrait, Generic, ImplTrait, Infer, Primitive,
 426             QPath, RawPointer, Slice, Tuple,
 427         };
 428
 429         match ty {
 430             clean::Type::Path { path } => Type::ResolvedPath {
 431                 name: path.whole_name(),
 432                 id: from_item_id(path.def_id().into(), tcx),
 433                 args: path.segments.last().map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 434                 param_names: Vec::new(),
 435             },
 436             DynTrait(mut bounds, lt) => {
 437                 let first_trait = bounds.remove(0).trait_;
 438
 439                 Type::ResolvedPath {
 440                     name: first_trait.whole_name(),
 441                     id: from_item_id(first_trait.def_id().into(), tcx),
 442                     args: first_trait
 443                         .segments
 444                         .last()
 445                         .map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 446                     param_names: bounds
 447                         .into_iter()
 448                         .map(|t| {
 449                             clean::GenericBound::TraitBound(t, rustc_hir::TraitBoundModifier::None)
 450                         })
 451                         .chain(lt.map(clean::GenericBound::Outlives))
 452                         .map(|bound| bound.into_tcx(tcx))
 453                         .collect(),
 454                 }
 455             }
 456             Generic(s) => Type::Generic(s.to_string()),
 457             Primitive(p) => Type::Primitive(p.as_sym().to_string()),
 458             BareFunction(f) => Type::FunctionPointer(Box::new((*f).into_tcx(tcx))),
 459             Tuple(t) => Type::Tuple(t.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 460             Slice(t) => Type::Slice(Box::new((*t).into_tcx(tcx))),
 461             Array(t, s) => Type::Array { type_: Box::new((*t).into_tcx(tcx)), len: s },
 462             ImplTrait(g) => Type::ImplTrait(g.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 463             Infer => Type::Infer,
 464             RawPointer(mutability, type_) => Type::RawPointer {
 465                 mutable: mutability == ast::Mutability::Mut,
 466                 type_: Box::new((*type_).into_tcx(tcx)),
 467             },
 468             BorrowedRef { lifetime, mutability, type_ } => Type::BorrowedRef {
 469                 lifetime: lifetime.map(|l| l.0.to_string()),
 470                 mutable: mutability == ast::Mutability::Mut,
 471                 type_: Box::new((*type_).into_tcx(tcx)),
 472             },
 473             QPath { assoc, self_type, trait_, .. } => {
 474                 // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 475                 let trait_ = clean::Type::Path { path: trait_ }.into_tcx(tcx);
 476                 Type::QualifiedPath {
 477                     name: assoc.name.to_string(),
 478                     args: Box::new(assoc.args.clone().into_tcx(tcx)),
 479                     self_type: Box::new((*self_type).into_tcx(tcx)),
 480                     trait_: Box::new(trait_),
 481                 }
 482             }
 483         }
 484     }
 485 }
 486
 487 impl FromWithTcx<clean::Term> for Term {
 488     fn from_tcx(term: clean::Term, tcx: TyCtxt<'_>) -> Term {
 489         match term {
 490             clean::Term::Type(ty) => Term::Type(FromWithTcx::from_tcx(ty, tcx)),
 491             clean::Term::Constant(c) => Term::Constant(FromWithTcx::from_tcx(c, tcx)),
 492         }
 493     }
 494 }
 495
 496 impl FromWithTcx<clean::BareFunctionDecl> for FunctionPointer {
 497     fn from_tcx(bare_decl: clean::BareFunctionDecl, tcx: TyCtxt<'_>) -> Self {
 498         let clean::BareFunctionDecl { unsafety, generic_params, decl, abi } = bare_decl;
 499         FunctionPointer {
 500             header: Header {
 501                 unsafe_: matches!(unsafety, rustc_hir::Unsafety::Unsafe),
 502                 const_: false,
 503                 async_: false,
 504                 abi: convert_abi(abi),
 505             },
 506             generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 507             decl: decl.into_tcx(tcx),
 508         }
 509     }
 510 }
 511
 512 impl FromWithTcx<clean::FnDecl> for FnDecl {
 513     fn from_tcx(decl: clean::FnDecl, tcx: TyCtxt<'_>) -> Self {
 514         let clean::FnDecl { inputs, output, c_variadic } = decl;
 515         FnDecl {
 516             inputs: inputs
 517                 .values
 518                 .into_iter()
 519                 .map(|arg| (arg.name.to_string(), arg.type_.into_tcx(tcx)))
 520                 .collect(),
 521             output: match output {
 522                 clean::FnRetTy::Return(t) => Some(t.into_tcx(tcx)),
 523                 clean::FnRetTy::DefaultReturn => None,
 524             },
 525             c_variadic,
 526         }
 527     }
 528 }
 529
 530 impl FromWithTcx<clean::Trait> for Trait {
 531     fn from_tcx(trait_: clean::Trait, tcx: TyCtxt<'_>) -> Self {
 532         let clean::Trait { unsafety, items, generics, bounds, is_auto } = trait_;
 533         Trait {
 534             is_auto,
 535             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 536             items: ids(items, tcx),
 537             generics: generics.into_tcx(tcx),
 538             bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 539             implementations: Vec::new(), // Added in JsonRenderer::item
 540         }
 541     }
 542 }
 543
 544 impl FromWithTcx<clean::Impl> for Impl {
 545     fn from_tcx(impl_: clean::Impl, tcx: TyCtxt<'_>) -> Self {
 546         let provided_trait_methods = impl_.provided_trait_methods(tcx);
 547         let clean::Impl { unsafety, generics, trait_, for_, items, polarity, kind } = impl_;
 548         // FIXME: should `trait_` be a clean::Path equivalent in JSON?
 549         let trait_ = trait_.map(|path| clean::Type::Path { path }.into_tcx(tcx));
 550         // FIXME: use something like ImplKind in JSON?
 551         let (synthetic, blanket_impl) = match kind {
 552             clean::ImplKind::Normal | clean::ImplKind::TupleVaradic => (false, None),
 553             clean::ImplKind::Auto => (true, None),
 554             clean::ImplKind::Blanket(ty) => (false, Some(*ty)),
 555         };
 556         let negative_polarity = match polarity {
 557             ty::ImplPolarity::Positive | ty::ImplPolarity::Reservation => false,
 558             ty::ImplPolarity::Negative => true,
 559         };
 560         Impl {
 561             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 562             generics: generics.into_tcx(tcx),
 563             provided_trait_methods: provided_trait_methods
 564                 .into_iter()
 565                 .map(|x| x.to_string())
 566                 .collect(),
 567             trait_,
 568             for_: for_.into_tcx(tcx),
 569             items: ids(items, tcx),
 570             negative: negative_polarity,
 571             synthetic,
 572             blanket_impl: blanket_impl.map(|x| x.into_tcx(tcx)),
 573         }
 574     }
 575 }
 576
 577 pub(crate) fn from_function(
 578     function: clean::Function,
 579     header: rustc_hir::FnHeader,
 580     tcx: TyCtxt<'_>,
 581 ) -> Function {
 582     let clean::Function { decl, generics } = function;
 583     Function {
 584         decl: decl.into_tcx(tcx),
 585         generics: generics.into_tcx(tcx),
 586         header: from_fn_header(&header),
 587     }
 588 }
 589
 590 pub(crate) fn from_function_method(
 591     function: clean::Function,
 592     has_body: bool,
 593     header: rustc_hir::FnHeader,
 594     tcx: TyCtxt<'_>,
 595 ) -> Method {
 596     let clean::Function { decl, generics } = function;
 597     Method {
 598         decl: decl.into_tcx(tcx),
 599         generics: generics.into_tcx(tcx),
 600         header: from_fn_header(&header),
 601         has_body,
 602     }
 603 }
 604
 605 impl FromWithTcx<clean::Enum> for Enum {
 606     fn from_tcx(enum_: clean::Enum, tcx: TyCtxt<'_>) -> Self {
 607         let variants_stripped = enum_.has_stripped_entries();
 608         let clean::Enum { variants, generics } = enum_;
 609         Enum {
 610             generics: generics.into_tcx(tcx),
 611             variants_stripped,
 612             variants: ids(variants, tcx),
 613             impls: Vec::new(), // Added in JsonRenderer::item
 614         }
 615     }
 616 }
 617
 618 impl FromWithTcx<clean::VariantStruct> for Struct {
 619     fn from_tcx(struct_: clean::VariantStruct, tcx: TyCtxt<'_>) -> Self {
 620         let fields_stripped = struct_.has_stripped_entries();
 621         let clean::VariantStruct { struct_type, fields } = struct_;
 622         Struct {
 623             struct_type: from_ctor_kind(struct_type),
 624             generics: Default::default(),
 625             fields_stripped,
 626             fields: ids(fields, tcx),
 627             impls: Vec::new(),
 628         }
 629     }
 630 }
 631
 632 impl FromWithTcx<clean::Variant> for Variant {
 633     fn from_tcx(variant: clean::Variant, tcx: TyCtxt<'_>) -> Self {
 634         use clean::Variant::*;
 635         match variant {
 636             CLike => Variant::Plain,
 637             Tuple(fields) => Variant::Tuple(
 638                 fields
 639                     .into_iter()
 640                     .map(|f| {
 641                         if let clean::StructFieldItem(ty) = *f.kind {
 642                             ty.into_tcx(tcx)
 643                         } else {
 644                             unreachable!()
 645                         }
 646                     })
 647                     .collect(),
 648             ),
 649             Struct(s) => Variant::Struct(ids(s.fields, tcx)),
 650         }
 651     }
 652 }
 653
 654 impl FromWithTcx<clean::Import> for Import {
 655     fn from_tcx(import: clean::Import, tcx: TyCtxt<'_>) -> Self {
 656         use clean::ImportKind::*;
 657         match import.kind {
 658             Simple(s) => Import {
 659                 source: import.source.path.whole_name(),
 660                 name: s.to_string(),
 661                 id: import.source.did.map(ItemId::from).map(|i| from_item_id(i, tcx)),
 662                 glob: false,
 663             },
 664             Glob => Import {
 665                 source: import.source.path.whole_name(),
 666                 name: import.source.path.last().to_string(),
 667                 id: import.source.did.map(ItemId::from).map(|i| from_item_id(i, tcx)),
 668                 glob: true,
 669             },
 670         }
 671     }
 672 }
 673
 674 impl FromWithTcx<clean::ProcMacro> for ProcMacro {
 675     fn from_tcx(mac: clean::ProcMacro, _tcx: TyCtxt<'_>) -> Self {
 676         ProcMacro {
 677             kind: from_macro_kind(mac.kind),
 678             helpers: mac.helpers.iter().map(|x| x.to_string()).collect(),
 679         }
 680     }
 681 }
 682
 683 pub(crate) fn from_macro_kind(kind: rustc_span::hygiene::MacroKind) -> MacroKind {
 684     use rustc_span::hygiene::MacroKind::*;
 685     match kind {
 686         Bang => MacroKind::Bang,
 687         Attr => MacroKind::Attr,
 688         Derive => MacroKind::Derive,
 689     }
 690 }
 691
 692 impl FromWithTcx<clean::Typedef> for Typedef {
 693     fn from_tcx(typedef: clean::Typedef, tcx: TyCtxt<'_>) -> Self {
 694         let clean::Typedef { type_, generics, item_type: _ } = typedef;
 695         Typedef { type_: type_.into_tcx(tcx), generics: generics.into_tcx(tcx) }
 696     }
 697 }
 698
 699 impl FromWithTcx<clean::OpaqueTy> for OpaqueTy {
 700     fn from_tcx(opaque: clean::OpaqueTy, tcx: TyCtxt<'_>) -> Self {
 701         OpaqueTy {
 702             bounds: opaque.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 703             generics: opaque.generics.into_tcx(tcx),
 704         }
 705     }
 706 }
 707
 708 impl FromWithTcx<clean::Static> for Static {
 709     fn from_tcx(stat: clean::Static, tcx: TyCtxt<'_>) -> Self {
 710         Static {
 711             type_: stat.type_.into_tcx(tcx),
 712             mutable: stat.mutability == ast::Mutability::Mut,
 713             expr: stat.expr.map(|e| print_const_expr(tcx, e)).unwrap_or_default(),
 714         }
 715     }
 716 }
 717
 718 impl FromWithTcx<clean::TraitAlias> for TraitAlias {
 719     fn from_tcx(alias: clean::TraitAlias, tcx: TyCtxt<'_>) -> Self {
 720         TraitAlias {
 721             generics: alias.generics.into_tcx(tcx),
 722             params: alias.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 723         }
 724     }
 725 }
 726
 727 impl FromWithTcx<ItemType> for ItemKind {
 728     fn from_tcx(kind: ItemType, _tcx: TyCtxt<'_>) -> Self {
 729         use ItemType::*;
 730         match kind {
 731             Module => ItemKind::Module,
 732             ExternCrate => ItemKind::ExternCrate,
 733             Import => ItemKind::Import,
 734             Struct => ItemKind::Struct,
 735             Union => ItemKind::Union,
 736             Enum => ItemKind::Enum,
 737             Function => ItemKind::Function,
 738             Typedef => ItemKind::Typedef,
 739             OpaqueTy => ItemKind::OpaqueTy,
 740             Static => ItemKind::Static,
 741             Constant => ItemKind::Constant,
 742             Trait => ItemKind::Trait,
 743             Impl => ItemKind::Impl,
 744             TyMethod | Method => ItemKind::Method,
 745             StructField => ItemKind::StructField,
 746             Variant => ItemKind::Variant,
 747             Macro => ItemKind::Macro,
 748             Primitive => ItemKind::Primitive,
 749             AssocConst => ItemKind::AssocConst,
 750             AssocType => ItemKind::AssocType,
 751             ForeignType => ItemKind::ForeignType,
 752             Keyword => ItemKind::Keyword,
 753             TraitAlias => ItemKind::TraitAlias,
 754             ProcAttribute => ItemKind::ProcAttribute,
 755             ProcDerive => ItemKind::ProcDerive,
 756             Generic => unreachable!(),
 757         }
 758     }
 759 }
 760
 761 fn ids(items: impl IntoIterator<Item = clean::Item>, tcx: TyCtxt<'_>) -> Vec<Id> {
 762     items
 763         .into_iter()
 764         .filter(|x| !x.is_stripped() && !x.is_keyword())
 765         .map(|i| from_item_id_with_name(i.item_id, tcx, i.name))
 766         .collect()
 767 }