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