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::KeywordItem => return None,
  47             clean::StrippedItem(ref inner) => {
  48                 match &**inner {
  49                     // We document stripped modules as with `Module::is_stripped` set to
  50                     // `true`, to prevent contained items from being orphaned for downstream users,
  51                     // as JSON does no inlining.
  52                     clean::ModuleItem(_)
  53                         if self.imported_items.contains(&item_id.expect_def_id()) =>
  54                     {
  55                         from_clean_item(item, self.tcx)
  56                     }
  57                     _ => return None,
  58                 }
  59             }
  60             _ => from_clean_item(item, self.tcx),
  61         };
  62         Some(Item {
  63             id: from_item_id_with_name(item_id, self.tcx, name),
  64             crate_id: item_id.krate().as_u32(),
  65             name: name.map(|sym| sym.to_string()),
  66             span: span.and_then(|span| self.convert_span(span)),
  67             visibility: self.convert_visibility(visibility),
  68             docs,
  69             attrs,
  70             deprecation: deprecation.map(from_deprecation),
  71             inner,
  72             links,
  73         })
  74     }
  75
  76     fn convert_span(&self, span: clean::Span) -> Option<Span> {
  77         match span.filename(self.sess()) {
  78             rustc_span::FileName::Real(name) => {
  79                 if let Some(local_path) = name.into_local_path() {
  80                     let hi = span.hi(self.sess());
  81                     let lo = span.lo(self.sess());
  82                     Some(Span {
  83                         filename: local_path,
  84                         begin: (lo.line, lo.col.to_usize()),
  85                         end: (hi.line, hi.col.to_usize()),
  86                     })
  87                 } else {
  88                     None
  89                 }
  90             }
  91             _ => None,
  92         }
  93     }
  94
  95     fn convert_visibility(&self, v: clean::Visibility) -> Visibility {
  96         use clean::Visibility::*;
  97         match v {
  98             Public => Visibility::Public,
  99             Inherited => Visibility::Default,
 100             Restricted(did) if did.is_crate_root() => Visibility::Crate,
 101             Restricted(did) => Visibility::Restricted {
 102                 parent: from_item_id(did.into(), self.tcx),
 103                 path: self.tcx.def_path(did).to_string_no_crate_verbose(),
 104             },
 105         }
 106     }
 107 }
 108
 109 pub(crate) trait FromWithTcx<T> {
 110     fn from_tcx(f: T, tcx: TyCtxt<'_>) -> Self;
 111 }
 112
 113 pub(crate) trait IntoWithTcx<T> {
 114     fn into_tcx(self, tcx: TyCtxt<'_>) -> T;
 115 }
 116
 117 impl<T, U> IntoWithTcx<U> for T
 118 where
 119     U: FromWithTcx<T>,
 120 {
 121     fn into_tcx(self, tcx: TyCtxt<'_>) -> U {
 122         U::from_tcx(self, tcx)
 123     }
 124 }
 125
 126 impl<I, T, U> FromWithTcx<I> for Vec<U>
 127 where
 128     I: IntoIterator<Item = T>,
 129     U: FromWithTcx<T>,
 130 {
 131     fn from_tcx(f: I, tcx: TyCtxt<'_>) -> Vec<U> {
 132         f.into_iter().map(|x| x.into_tcx(tcx)).collect()
 133     }
 134 }
 135
 136 pub(crate) fn from_deprecation(deprecation: rustc_attr::Deprecation) -> Deprecation {
 137     #[rustfmt::skip]
 138     let rustc_attr::Deprecation { since, note, is_since_rustc_version: _, suggestion: _ } = deprecation;
 139     Deprecation { since: since.map(|s| s.to_string()), note: note.map(|s| s.to_string()) }
 140 }
 141
 142 impl FromWithTcx<clean::GenericArgs> for GenericArgs {
 143     fn from_tcx(args: clean::GenericArgs, tcx: TyCtxt<'_>) -> Self {
 144         use clean::GenericArgs::*;
 145         match args {
 146             AngleBracketed { args, bindings } => GenericArgs::AngleBracketed {
 147                 args: args.into_vec().into_tcx(tcx),
 148                 bindings: bindings.into_tcx(tcx),
 149             },
 150             Parenthesized { inputs, output } => GenericArgs::Parenthesized {
 151                 inputs: inputs.into_vec().into_tcx(tcx),
 152                 output: output.map(|a| (*a).into_tcx(tcx)),
 153             },
 154         }
 155     }
 156 }
 157
 158 impl FromWithTcx<clean::GenericArg> for GenericArg {
 159     fn from_tcx(arg: clean::GenericArg, tcx: TyCtxt<'_>) -> Self {
 160         use clean::GenericArg::*;
 161         match arg {
 162             Lifetime(l) => GenericArg::Lifetime(convert_lifetime(l)),
 163             Type(t) => GenericArg::Type(t.into_tcx(tcx)),
 164             Const(box c) => GenericArg::Const(c.into_tcx(tcx)),
 165             Infer => GenericArg::Infer,
 166         }
 167     }
 168 }
 169
 170 impl FromWithTcx<clean::Constant> for Constant {
 171     fn from_tcx(constant: clean::Constant, tcx: TyCtxt<'_>) -> Self {
 172         let expr = constant.expr(tcx);
 173         let value = constant.value(tcx);
 174         let is_literal = constant.is_literal(tcx);
 175         Constant { type_: constant.type_.into_tcx(tcx), expr, value, is_literal }
 176     }
 177 }
 178
 179 impl FromWithTcx<clean::TypeBinding> for TypeBinding {
 180     fn from_tcx(binding: clean::TypeBinding, tcx: TyCtxt<'_>) -> Self {
 181         TypeBinding {
 182             name: binding.assoc.name.to_string(),
 183             args: binding.assoc.args.into_tcx(tcx),
 184             binding: binding.kind.into_tcx(tcx),
 185         }
 186     }
 187 }
 188
 189 impl FromWithTcx<clean::TypeBindingKind> for TypeBindingKind {
 190     fn from_tcx(kind: clean::TypeBindingKind, tcx: TyCtxt<'_>) -> Self {
 191         use clean::TypeBindingKind::*;
 192         match kind {
 193             Equality { term } => TypeBindingKind::Equality(term.into_tcx(tcx)),
 194             Constraint { bounds } => TypeBindingKind::Constraint(bounds.into_tcx(tcx)),
 195         }
 196     }
 197 }
 198
 199 /// It generates an ID as follows:
 200 ///
 201 /// `CRATE_ID:ITEM_ID[:NAME_ID]` (if there is no name, NAME_ID is not generated).
 202 pub(crate) fn from_item_id(item_id: ItemId, tcx: TyCtxt<'_>) -> Id {
 203     from_item_id_with_name(item_id, tcx, None)
 204 }
 205
 206 // FIXME: this function (and appending the name at the end of the ID) should be removed when
 207 // reexports are not inlined anymore for json format. It should be done in #93518.
 208 pub(crate) fn from_item_id_with_name(item_id: ItemId, tcx: TyCtxt<'_>, name: Option<Symbol>) -> Id {
 209     struct DisplayDefId<'a>(DefId, TyCtxt<'a>, Option<Symbol>);
 210
 211     impl<'a> fmt::Display for DisplayDefId<'a> {
 212         fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 213             let name = match self.2 {
 214                 Some(name) => format!(":{}", name.as_u32()),
 215                 None => self
 216                     .1
 217                     .opt_item_name(self.0)
 218                     .map(|n| format!(":{}", n.as_u32()))
 219                     .unwrap_or_default(),
 220             };
 221             write!(f, "{}:{}{}", self.0.krate.as_u32(), u32::from(self.0.index), name)
 222         }
 223     }
 224
 225     match item_id {
 226         ItemId::DefId(did) => Id(format!("{}", DisplayDefId(did, tcx, name))),
 227         ItemId::Blanket { for_, impl_id } => {
 228             Id(format!("b:{}-{}", DisplayDefId(impl_id, tcx, None), DisplayDefId(for_, tcx, name)))
 229         }
 230         ItemId::Auto { for_, trait_ } => {
 231             Id(format!("a:{}-{}", DisplayDefId(trait_, tcx, None), DisplayDefId(for_, tcx, name)))
 232         }
 233         ItemId::Primitive(ty, krate) => Id(format!("p:{}:{}", krate.as_u32(), ty.as_sym())),
 234     }
 235 }
 236
 237 fn from_clean_item(item: clean::Item, tcx: TyCtxt<'_>) -> ItemEnum {
 238     use clean::ItemKind::*;
 239     let name = item.name;
 240     let is_crate = item.is_crate();
 241     let header = item.fn_header(tcx);
 242
 243     match *item.kind {
 244         ModuleItem(m) => {
 245             ItemEnum::Module(Module { is_crate, items: ids(m.items, tcx), is_stripped: false })
 246         }
 247         ImportItem(i) => ItemEnum::Import(i.into_tcx(tcx)),
 248         StructItem(s) => ItemEnum::Struct(s.into_tcx(tcx)),
 249         UnionItem(u) => ItemEnum::Union(u.into_tcx(tcx)),
 250         StructFieldItem(f) => ItemEnum::StructField(f.into_tcx(tcx)),
 251         EnumItem(e) => ItemEnum::Enum(e.into_tcx(tcx)),
 252         VariantItem(v) => ItemEnum::Variant(v.into_tcx(tcx)),
 253         FunctionItem(f) => ItemEnum::Function(from_function(f, header.unwrap(), tcx)),
 254         ForeignFunctionItem(f) => ItemEnum::Function(from_function(f, header.unwrap(), tcx)),
 255         TraitItem(t) => ItemEnum::Trait((*t).into_tcx(tcx)),
 256         TraitAliasItem(t) => ItemEnum::TraitAlias(t.into_tcx(tcx)),
 257         MethodItem(m, _) => ItemEnum::Method(from_function_method(m, true, header.unwrap(), tcx)),
 258         TyMethodItem(m) => ItemEnum::Method(from_function_method(m, false, header.unwrap(), tcx)),
 259         ImplItem(i) => ItemEnum::Impl((*i).into_tcx(tcx)),
 260         StaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 261         ForeignStaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 262         ForeignTypeItem => ItemEnum::ForeignType,
 263         TypedefItem(t) => ItemEnum::Typedef(t.into_tcx(tcx)),
 264         OpaqueTyItem(t) => ItemEnum::OpaqueTy(t.into_tcx(tcx)),
 265         ConstantItem(c) => ItemEnum::Constant(c.into_tcx(tcx)),
 266         MacroItem(m) => ItemEnum::Macro(m.source),
 267         ProcMacroItem(m) => ItemEnum::ProcMacro(m.into_tcx(tcx)),
 268         PrimitiveItem(p) => ItemEnum::PrimitiveType(p.as_sym().to_string()),
 269         TyAssocConstItem(ty) => ItemEnum::AssocConst { type_: ty.into_tcx(tcx), default: None },
 270         AssocConstItem(ty, default) => {
 271             ItemEnum::AssocConst { type_: ty.into_tcx(tcx), default: Some(default.expr(tcx)) }
 272         }
 273         TyAssocTypeItem(g, b) => ItemEnum::AssocType {
 274             generics: (*g).into_tcx(tcx),
 275             bounds: b.into_tcx(tcx),
 276             default: None,
 277         },
 278         AssocTypeItem(t, b) => ItemEnum::AssocType {
 279             generics: t.generics.into_tcx(tcx),
 280             bounds: b.into_tcx(tcx),
 281             default: Some(t.item_type.unwrap_or(t.type_).into_tcx(tcx)),
 282         },
 283         // `convert_item` early returns `None` for stripped items and keywords.
 284         KeywordItem => unreachable!(),
 285         StrippedItem(inner) => {
 286             match *inner {
 287                 ModuleItem(m) => ItemEnum::Module(Module {
 288                     is_crate,
 289                     items: ids(m.items, tcx),
 290                     is_stripped: true,
 291                 }),
 292                 // `convert_item` early returns `None` for stripped items we're not including
 293                 _ => unreachable!(),
 294             }
 295         }
 296         ExternCrateItem { ref src } => ItemEnum::ExternCrate {
 297             name: name.as_ref().unwrap().to_string(),
 298             rename: src.map(|x| x.to_string()),
 299         },
 300     }
 301 }
 302
 303 impl FromWithTcx<clean::Struct> for Struct {
 304     fn from_tcx(struct_: clean::Struct, tcx: TyCtxt<'_>) -> Self {
 305         let fields_stripped = struct_.has_stripped_entries();
 306         let clean::Struct { struct_type, generics, fields } = struct_;
 307         Struct {
 308             struct_type: from_ctor_kind(struct_type),
 309             generics: generics.into_tcx(tcx),
 310             fields_stripped,
 311             fields: ids(fields, tcx),
 312             impls: Vec::new(), // Added in JsonRenderer::item
 313         }
 314     }
 315 }
 316
 317 impl FromWithTcx<clean::Union> for Union {
 318     fn from_tcx(union_: clean::Union, tcx: TyCtxt<'_>) -> Self {
 319         let fields_stripped = union_.has_stripped_entries();
 320         let clean::Union { generics, fields } = union_;
 321         Union {
 322             generics: generics.into_tcx(tcx),
 323             fields_stripped,
 324             fields: ids(fields, tcx),
 325             impls: Vec::new(), // Added in JsonRenderer::item
 326         }
 327     }
 328 }
 329
 330 pub(crate) fn from_ctor_kind(struct_type: CtorKind) -> StructType {
 331     match struct_type {
 332         CtorKind::Fictive => StructType::Plain,
 333         CtorKind::Fn => StructType::Tuple,
 334         CtorKind::Const => StructType::Unit,
 335     }
 336 }
 337
 338 pub(crate) fn from_fn_header(header: &rustc_hir::FnHeader) -> Header {
 339     Header {
 340         async_: header.is_async(),
 341         const_: header.is_const(),
 342         unsafe_: header.is_unsafe(),
 343         abi: convert_abi(header.abi),
 344     }
 345 }
 346
 347 fn convert_abi(a: RustcAbi) -> Abi {
 348     match a {
 349         RustcAbi::Rust => Abi::Rust,
 350         RustcAbi::C { unwind } => Abi::C { unwind },
 351         RustcAbi::Cdecl { unwind } => Abi::Cdecl { unwind },
 352         RustcAbi::Stdcall { unwind } => Abi::Stdcall { unwind },
 353         RustcAbi::Fastcall { unwind } => Abi::Fastcall { unwind },
 354         RustcAbi::Aapcs { unwind } => Abi::Aapcs { unwind },
 355         RustcAbi::Win64 { unwind } => Abi::Win64 { unwind },
 356         RustcAbi::SysV64 { unwind } => Abi::SysV64 { unwind },
 357         RustcAbi::System { unwind } => Abi::System { unwind },
 358         _ => Abi::Other(a.to_string()),
 359     }
 360 }
 361
 362 fn convert_lifetime(l: clean::Lifetime) -> String {
 363     l.0.to_string()
 364 }
 365
 366 impl FromWithTcx<clean::Generics> for Generics {
 367     fn from_tcx(generics: clean::Generics, tcx: TyCtxt<'_>) -> Self {
 368         Generics {
 369             params: generics.params.into_tcx(tcx),
 370             where_predicates: generics.where_predicates.into_tcx(tcx),
 371         }
 372     }
 373 }
 374
 375 impl FromWithTcx<clean::GenericParamDef> for GenericParamDef {
 376     fn from_tcx(generic_param: clean::GenericParamDef, tcx: TyCtxt<'_>) -> Self {
 377         GenericParamDef {
 378             name: generic_param.name.to_string(),
 379             kind: generic_param.kind.into_tcx(tcx),
 380         }
 381     }
 382 }
 383
 384 impl FromWithTcx<clean::GenericParamDefKind> for GenericParamDefKind {
 385     fn from_tcx(kind: clean::GenericParamDefKind, tcx: TyCtxt<'_>) -> Self {
 386         use clean::GenericParamDefKind::*;
 387         match kind {
 388             Lifetime { outlives } => GenericParamDefKind::Lifetime {
 389                 outlives: outlives.into_iter().map(convert_lifetime).collect(),
 390             },
 391             Type { did: _, bounds, default, synthetic } => GenericParamDefKind::Type {
 392                 bounds: bounds.into_tcx(tcx),
 393                 default: default.map(|x| (*x).into_tcx(tcx)),
 394                 synthetic,
 395             },
 396             Const { did: _, ty, default } => GenericParamDefKind::Const {
 397                 type_: (*ty).into_tcx(tcx),
 398                 default: default.map(|x| *x),
 399             },
 400         }
 401     }
 402 }
 403
 404 impl FromWithTcx<clean::WherePredicate> for WherePredicate {
 405     fn from_tcx(predicate: clean::WherePredicate, tcx: TyCtxt<'_>) -> Self {
 406         use clean::WherePredicate::*;
 407         match predicate {
 408             BoundPredicate { ty, bounds, bound_params } => WherePredicate::BoundPredicate {
 409                 type_: ty.into_tcx(tcx),
 410                 bounds: bounds.into_tcx(tcx),
 411                 generic_params: bound_params
 412                     .into_iter()
 413                     .map(|x| GenericParamDef {
 414                         name: x.0.to_string(),
 415                         kind: GenericParamDefKind::Lifetime { outlives: vec![] },
 416                     })
 417                     .collect(),
 418             },
 419             RegionPredicate { lifetime, bounds } => WherePredicate::RegionPredicate {
 420                 lifetime: convert_lifetime(lifetime),
 421                 bounds: bounds.into_tcx(tcx),
 422             },
 423             EqPredicate { lhs, rhs } => {
 424                 WherePredicate::EqPredicate { lhs: lhs.into_tcx(tcx), rhs: rhs.into_tcx(tcx) }
 425             }
 426         }
 427     }
 428 }
 429
 430 impl FromWithTcx<clean::GenericBound> for GenericBound {
 431     fn from_tcx(bound: clean::GenericBound, tcx: TyCtxt<'_>) -> Self {
 432         use clean::GenericBound::*;
 433         match bound {
 434             TraitBound(clean::PolyTrait { trait_, generic_params }, modifier) => {
 435                 GenericBound::TraitBound {
 436                     trait_: trait_.into_tcx(tcx),
 437                     generic_params: generic_params.into_tcx(tcx),
 438                     modifier: from_trait_bound_modifier(modifier),
 439                 }
 440             }
 441             Outlives(lifetime) => GenericBound::Outlives(convert_lifetime(lifetime)),
 442         }
 443     }
 444 }
 445
 446 pub(crate) fn from_trait_bound_modifier(
 447     modifier: rustc_hir::TraitBoundModifier,
 448 ) -> TraitBoundModifier {
 449     use rustc_hir::TraitBoundModifier::*;
 450     match modifier {
 451         None => TraitBoundModifier::None,
 452         Maybe => TraitBoundModifier::Maybe,
 453         MaybeConst => TraitBoundModifier::MaybeConst,
 454     }
 455 }
 456
 457 impl FromWithTcx<clean::Type> for Type {
 458     fn from_tcx(ty: clean::Type, tcx: TyCtxt<'_>) -> Self {
 459         use clean::Type::{
 460             Array, BareFunction, BorrowedRef, Generic, ImplTrait, Infer, Primitive, QPath,
 461             RawPointer, Slice, Tuple,
 462         };
 463
 464         match ty {
 465             clean::Type::Path { path } => Type::ResolvedPath(path.into_tcx(tcx)),
 466             clean::Type::DynTrait(bounds, lt) => Type::DynTrait(DynTrait {
 467                 lifetime: lt.map(convert_lifetime),
 468                 traits: bounds.into_tcx(tcx),
 469             }),
 470             Generic(s) => Type::Generic(s.to_string()),
 471             Primitive(p) => Type::Primitive(p.as_sym().to_string()),
 472             BareFunction(f) => Type::FunctionPointer(Box::new((*f).into_tcx(tcx))),
 473             Tuple(t) => Type::Tuple(t.into_tcx(tcx)),
 474             Slice(t) => Type::Slice(Box::new((*t).into_tcx(tcx))),
 475             Array(t, s) => Type::Array { type_: Box::new((*t).into_tcx(tcx)), len: s },
 476             ImplTrait(g) => Type::ImplTrait(g.into_tcx(tcx)),
 477             Infer => Type::Infer,
 478             RawPointer(mutability, type_) => Type::RawPointer {
 479                 mutable: mutability == ast::Mutability::Mut,
 480                 type_: Box::new((*type_).into_tcx(tcx)),
 481             },
 482             BorrowedRef { lifetime, mutability, type_ } => Type::BorrowedRef {
 483                 lifetime: lifetime.map(convert_lifetime),
 484                 mutable: mutability == ast::Mutability::Mut,
 485                 type_: Box::new((*type_).into_tcx(tcx)),
 486             },
 487             QPath(box clean::QPathData { assoc, self_type, trait_, .. }) => Type::QualifiedPath {
 488                 name: assoc.name.to_string(),
 489                 args: Box::new(assoc.args.into_tcx(tcx)),
 490                 self_type: Box::new(self_type.into_tcx(tcx)),
 491                 trait_: trait_.into_tcx(tcx),
 492             },
 493         }
 494     }
 495 }
 496
 497 impl FromWithTcx<clean::Path> for Path {
 498     fn from_tcx(path: clean::Path, tcx: TyCtxt<'_>) -> Path {
 499         Path {
 500             name: path.whole_name(),
 501             id: from_item_id(path.def_id().into(), tcx),
 502             args: path.segments.last().map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 503         }
 504     }
 505 }
 506
 507 impl FromWithTcx<clean::Term> for Term {
 508     fn from_tcx(term: clean::Term, tcx: TyCtxt<'_>) -> Term {
 509         match term {
 510             clean::Term::Type(ty) => Term::Type(FromWithTcx::from_tcx(ty, tcx)),
 511             clean::Term::Constant(c) => Term::Constant(FromWithTcx::from_tcx(c, tcx)),
 512         }
 513     }
 514 }
 515
 516 impl FromWithTcx<clean::BareFunctionDecl> for FunctionPointer {
 517     fn from_tcx(bare_decl: clean::BareFunctionDecl, tcx: TyCtxt<'_>) -> Self {
 518         let clean::BareFunctionDecl { unsafety, generic_params, decl, abi } = bare_decl;
 519         FunctionPointer {
 520             header: Header {
 521                 unsafe_: matches!(unsafety, rustc_hir::Unsafety::Unsafe),
 522                 const_: false,
 523                 async_: false,
 524                 abi: convert_abi(abi),
 525             },
 526             generic_params: generic_params.into_tcx(tcx),
 527             decl: decl.into_tcx(tcx),
 528         }
 529     }
 530 }
 531
 532 impl FromWithTcx<clean::FnDecl> for FnDecl {
 533     fn from_tcx(decl: clean::FnDecl, tcx: TyCtxt<'_>) -> Self {
 534         let clean::FnDecl { inputs, output, c_variadic } = decl;
 535         FnDecl {
 536             inputs: inputs
 537                 .values
 538                 .into_iter()
 539                 .map(|arg| (arg.name.to_string(), arg.type_.into_tcx(tcx)))
 540                 .collect(),
 541             output: match output {
 542                 clean::FnRetTy::Return(t) => Some(t.into_tcx(tcx)),
 543                 clean::FnRetTy::DefaultReturn => None,
 544             },
 545             c_variadic,
 546         }
 547     }
 548 }
 549
 550 impl FromWithTcx<clean::Trait> for Trait {
 551     fn from_tcx(trait_: clean::Trait, tcx: TyCtxt<'_>) -> Self {
 552         let is_auto = trait_.is_auto(tcx);
 553         let is_unsafe = trait_.unsafety(tcx) == rustc_hir::Unsafety::Unsafe;
 554         let clean::Trait { items, generics, bounds, .. } = trait_;
 555         Trait {
 556             is_auto,
 557             is_unsafe,
 558             items: ids(items, tcx),
 559             generics: generics.into_tcx(tcx),
 560             bounds: bounds.into_tcx(tcx),
 561             implementations: Vec::new(), // Added in JsonRenderer::item
 562         }
 563     }
 564 }
 565
 566 impl FromWithTcx<clean::PolyTrait> for PolyTrait {
 567     fn from_tcx(
 568         clean::PolyTrait { trait_, generic_params }: clean::PolyTrait,
 569         tcx: TyCtxt<'_>,
 570     ) -> Self {
 571         PolyTrait { trait_: trait_.into_tcx(tcx), generic_params: generic_params.into_tcx(tcx) }
 572     }
 573 }
 574
 575 impl FromWithTcx<clean::Impl> for Impl {
 576     fn from_tcx(impl_: clean::Impl, tcx: TyCtxt<'_>) -> Self {
 577         let provided_trait_methods = impl_.provided_trait_methods(tcx);
 578         let clean::Impl { unsafety, generics, trait_, for_, items, polarity, kind } = impl_;
 579         // FIXME: use something like ImplKind in JSON?
 580         let (synthetic, blanket_impl) = match kind {
 581             clean::ImplKind::Normal | clean::ImplKind::FakeVaradic => (false, None),
 582             clean::ImplKind::Auto => (true, None),
 583             clean::ImplKind::Blanket(ty) => (false, Some(*ty)),
 584         };
 585         let negative_polarity = match polarity {
 586             ty::ImplPolarity::Positive | ty::ImplPolarity::Reservation => false,
 587             ty::ImplPolarity::Negative => true,
 588         };
 589         Impl {
 590             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 591             generics: generics.into_tcx(tcx),
 592             provided_trait_methods: provided_trait_methods
 593                 .into_iter()
 594                 .map(|x| x.to_string())
 595                 .collect(),
 596             trait_: trait_.map(|path| path.into_tcx(tcx)),
 597             for_: for_.into_tcx(tcx),
 598             items: ids(items, tcx),
 599             negative: negative_polarity,
 600             synthetic,
 601             blanket_impl: blanket_impl.map(|x| x.into_tcx(tcx)),
 602         }
 603     }
 604 }
 605
 606 pub(crate) fn from_function(
 607     function: Box<clean::Function>,
 608     header: rustc_hir::FnHeader,
 609     tcx: TyCtxt<'_>,
 610 ) -> Function {
 611     let clean::Function { decl, generics } = *function;
 612     Function {
 613         decl: decl.into_tcx(tcx),
 614         generics: generics.into_tcx(tcx),
 615         header: from_fn_header(&header),
 616     }
 617 }
 618
 619 pub(crate) fn from_function_method(
 620     function: Box<clean::Function>,
 621     has_body: bool,
 622     header: rustc_hir::FnHeader,
 623     tcx: TyCtxt<'_>,
 624 ) -> Method {
 625     let clean::Function { decl, generics } = *function;
 626     Method {
 627         decl: decl.into_tcx(tcx),
 628         generics: generics.into_tcx(tcx),
 629         header: from_fn_header(&header),
 630         has_body,
 631     }
 632 }
 633
 634 impl FromWithTcx<clean::Enum> for Enum {
 635     fn from_tcx(enum_: clean::Enum, tcx: TyCtxt<'_>) -> Self {
 636         let variants_stripped = enum_.has_stripped_entries();
 637         let clean::Enum { variants, generics } = enum_;
 638         Enum {
 639             generics: generics.into_tcx(tcx),
 640             variants_stripped,
 641             variants: ids(variants, tcx),
 642             impls: Vec::new(), // Added in JsonRenderer::item
 643         }
 644     }
 645 }
 646
 647 impl FromWithTcx<clean::VariantStruct> for Struct {
 648     fn from_tcx(struct_: clean::VariantStruct, tcx: TyCtxt<'_>) -> Self {
 649         let fields_stripped = struct_.has_stripped_entries();
 650         let clean::VariantStruct { struct_type, fields } = struct_;
 651         Struct {
 652             struct_type: from_ctor_kind(struct_type),
 653             generics: Generics { params: vec![], where_predicates: vec![] },
 654             fields_stripped,
 655             fields: ids(fields, tcx),
 656             impls: Vec::new(),
 657         }
 658     }
 659 }
 660
 661 impl FromWithTcx<clean::Variant> for Variant {
 662     fn from_tcx(variant: clean::Variant, tcx: TyCtxt<'_>) -> Self {
 663         use clean::Variant::*;
 664         match variant {
 665             CLike => Variant::Plain,
 666             Tuple(fields) => Variant::Tuple(
 667                 fields
 668                     .into_iter()
 669                     .filter_map(|f| match *f.kind {
 670                         clean::StructFieldItem(ty) => Some(ty.into_tcx(tcx)),
 671                         clean::StrippedItem(_) => None,
 672                         _ => unreachable!(),
 673                     })
 674                     .collect(),
 675             ),
 676             Struct(s) => Variant::Struct(ids(s.fields, tcx)),
 677         }
 678     }
 679 }
 680
 681 impl FromWithTcx<clean::Import> for Import {
 682     fn from_tcx(import: clean::Import, tcx: TyCtxt<'_>) -> Self {
 683         use clean::ImportKind::*;
 684         let (name, glob) = match import.kind {
 685             Simple(s) => (s.to_string(), false),
 686             Glob => (
 687                 import.source.path.last_opt().unwrap_or_else(|| Symbol::intern("*")).to_string(),
 688                 true,
 689             ),
 690         };
 691         Import {
 692             source: import.source.path.whole_name(),
 693             name,
 694             id: import.source.did.map(ItemId::from).map(|i| from_item_id(i, tcx)),
 695             glob,
 696         }
 697     }
 698 }
 699
 700 impl FromWithTcx<clean::ProcMacro> for ProcMacro {
 701     fn from_tcx(mac: clean::ProcMacro, _tcx: TyCtxt<'_>) -> Self {
 702         ProcMacro {
 703             kind: from_macro_kind(mac.kind),
 704             helpers: mac.helpers.iter().map(|x| x.to_string()).collect(),
 705         }
 706     }
 707 }
 708
 709 pub(crate) fn from_macro_kind(kind: rustc_span::hygiene::MacroKind) -> MacroKind {
 710     use rustc_span::hygiene::MacroKind::*;
 711     match kind {
 712         Bang => MacroKind::Bang,
 713         Attr => MacroKind::Attr,
 714         Derive => MacroKind::Derive,
 715     }
 716 }
 717
 718 impl FromWithTcx<Box<clean::Typedef>> for Typedef {
 719     fn from_tcx(typedef: Box<clean::Typedef>, tcx: TyCtxt<'_>) -> Self {
 720         let clean::Typedef { type_, generics, item_type: _ } = *typedef;
 721         Typedef { type_: type_.into_tcx(tcx), generics: generics.into_tcx(tcx) }
 722     }
 723 }
 724
 725 impl FromWithTcx<clean::OpaqueTy> for OpaqueTy {
 726     fn from_tcx(opaque: clean::OpaqueTy, tcx: TyCtxt<'_>) -> Self {
 727         OpaqueTy { bounds: opaque.bounds.into_tcx(tcx), generics: opaque.generics.into_tcx(tcx) }
 728     }
 729 }
 730
 731 impl FromWithTcx<clean::Static> for Static {
 732     fn from_tcx(stat: clean::Static, tcx: TyCtxt<'_>) -> Self {
 733         Static {
 734             type_: stat.type_.into_tcx(tcx),
 735             mutable: stat.mutability == ast::Mutability::Mut,
 736             expr: stat.expr.map(|e| print_const_expr(tcx, e)).unwrap_or_default(),
 737         }
 738     }
 739 }
 740
 741 impl FromWithTcx<clean::TraitAlias> for TraitAlias {
 742     fn from_tcx(alias: clean::TraitAlias, tcx: TyCtxt<'_>) -> Self {
 743         TraitAlias { generics: alias.generics.into_tcx(tcx), params: alias.bounds.into_tcx(tcx) }
 744     }
 745 }
 746
 747 impl FromWithTcx<ItemType> for ItemKind {
 748     fn from_tcx(kind: ItemType, _tcx: TyCtxt<'_>) -> Self {
 749         use ItemType::*;
 750         match kind {
 751             Module => ItemKind::Module,
 752             ExternCrate => ItemKind::ExternCrate,
 753             Import => ItemKind::Import,
 754             Struct => ItemKind::Struct,
 755             Union => ItemKind::Union,
 756             Enum => ItemKind::Enum,
 757             Function => ItemKind::Function,
 758             Typedef => ItemKind::Typedef,
 759             OpaqueTy => ItemKind::OpaqueTy,
 760             Static => ItemKind::Static,
 761             Constant => ItemKind::Constant,
 762             Trait => ItemKind::Trait,
 763             Impl => ItemKind::Impl,
 764             TyMethod | Method => ItemKind::Method,
 765             StructField => ItemKind::StructField,
 766             Variant => ItemKind::Variant,
 767             Macro => ItemKind::Macro,
 768             Primitive => ItemKind::Primitive,
 769             AssocConst => ItemKind::AssocConst,
 770             AssocType => ItemKind::AssocType,
 771             ForeignType => ItemKind::ForeignType,
 772             Keyword => ItemKind::Keyword,
 773             TraitAlias => ItemKind::TraitAlias,
 774             ProcAttribute => ItemKind::ProcAttribute,
 775             ProcDerive => ItemKind::ProcDerive,
 776         }
 777     }
 778 }
 779
 780 fn ids(items: impl IntoIterator<Item = clean::Item>, tcx: TyCtxt<'_>) -> Vec<Id> {
 781     items
 782         .into_iter()
 783         .filter(|x| !x.is_stripped() && !x.is_keyword())
 784         .map(|i| from_item_id_with_name(i.item_id, tcx, i.name))
 785         .collect()
 786 }