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::TyCtxt;
  13 use rustc_span::def_id::CRATE_DEF_INDEX;
  14 use rustc_span::Pos;
  15
  16 use rustdoc_json_types::*;
  17
  18 use crate::clean::utils::print_const_expr;
  19 use crate::clean::{self, ItemId};
  20 use crate::formats::item_type::ItemType;
  21 use crate::json::JsonRenderer;
  22 use std::collections::HashSet;
  23
  24 impl JsonRenderer<'_> {
  25     pub(super) fn convert_item(&self, item: clean::Item) -> Option<Item> {
  26         let deprecation = item.deprecation(self.tcx);
  27         let links = self
  28             .cache
  29             .intra_doc_links
  30             .get(&item.def_id)
  31             .into_iter()
  32             .flatten()
  33             .map(|clean::ItemLink { link, did, .. }| (link.clone(), from_item_id((*did).into())))
  34             .collect();
  35         let docs = item.attrs.collapsed_doc_value();
  36         let attrs = item
  37             .attrs
  38             .other_attrs
  39             .iter()
  40             .map(rustc_ast_pretty::pprust::attribute_to_string)
  41             .collect();
  42         let span = item.span(self.tcx);
  43         let clean::Item { name, attrs: _, kind: _, visibility, def_id, cfg: _ } = item;
  44         let inner = match *item.kind {
  45             clean::StrippedItem(_) => return None,
  46             _ => from_clean_item(item, self.tcx),
  47         };
  48         Some(Item {
  49             id: from_item_id(def_id),
  50             crate_id: def_id.krate().as_u32(),
  51             name: name.map(|sym| sym.to_string()),
  52             span: self.convert_span(span),
  53             visibility: self.convert_visibility(visibility),
  54             docs,
  55             attrs,
  56             deprecation: deprecation.map(from_deprecation),
  57             inner,
  58             links,
  59         })
  60     }
  61
  62     fn convert_span(&self, span: clean::Span) -> Option<Span> {
  63         match span.filename(self.sess()) {
  64             rustc_span::FileName::Real(name) => {
  65                 if let Some(local_path) = name.into_local_path() {
  66                     let hi = span.hi(self.sess());
  67                     let lo = span.lo(self.sess());
  68                     Some(Span {
  69                         filename: local_path,
  70                         begin: (lo.line, lo.col.to_usize()),
  71                         end: (hi.line, hi.col.to_usize()),
  72                     })
  73                 } else {
  74                     None
  75                 }
  76             }
  77             _ => None,
  78         }
  79     }
  80
  81     fn convert_visibility(&self, v: clean::Visibility) -> Visibility {
  82         use clean::Visibility::*;
  83         match v {
  84             Public => Visibility::Public,
  85             Inherited => Visibility::Default,
  86             Restricted(did) if did.index == CRATE_DEF_INDEX => Visibility::Crate,
  87             Restricted(did) => Visibility::Restricted {
  88                 parent: from_item_id(did.into()),
  89                 path: self.tcx.def_path(did).to_string_no_crate_verbose(),
  90             },
  91         }
  92     }
  93 }
  94
  95 crate trait FromWithTcx<T> {
  96     fn from_tcx(f: T, tcx: TyCtxt<'_>) -> Self;
  97 }
  98
  99 crate trait IntoWithTcx<T> {
 100     fn into_tcx(self, tcx: TyCtxt<'_>) -> T;
 101 }
 102
 103 impl<T, U> IntoWithTcx<U> for T
 104 where
 105     U: FromWithTcx<T>,
 106 {
 107     fn into_tcx(self, tcx: TyCtxt<'_>) -> U {
 108         U::from_tcx(self, tcx)
 109     }
 110 }
 111
 112 crate fn from_deprecation(deprecation: rustc_attr::Deprecation) -> Deprecation {
 113     #[rustfmt::skip]
 114     let rustc_attr::Deprecation { since, note, is_since_rustc_version: _, suggestion: _ } = deprecation;
 115     Deprecation { since: since.map(|s| s.to_string()), note: note.map(|s| s.to_string()) }
 116 }
 117
 118 impl FromWithTcx<clean::GenericArgs> for GenericArgs {
 119     fn from_tcx(args: clean::GenericArgs, tcx: TyCtxt<'_>) -> Self {
 120         use clean::GenericArgs::*;
 121         match args {
 122             AngleBracketed { args, bindings } => GenericArgs::AngleBracketed {
 123                 args: args.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 124                 bindings: bindings.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 125             },
 126             Parenthesized { inputs, output } => GenericArgs::Parenthesized {
 127                 inputs: inputs.into_iter().map(|a| a.into_tcx(tcx)).collect(),
 128                 output: output.map(|a| (*a).into_tcx(tcx)),
 129             },
 130         }
 131     }
 132 }
 133
 134 impl FromWithTcx<clean::GenericArg> for GenericArg {
 135     fn from_tcx(arg: clean::GenericArg, tcx: TyCtxt<'_>) -> Self {
 136         use clean::GenericArg::*;
 137         match arg {
 138             Lifetime(l) => GenericArg::Lifetime(l.0.to_string()),
 139             Type(t) => GenericArg::Type(t.into_tcx(tcx)),
 140             Const(box c) => GenericArg::Const(c.into_tcx(tcx)),
 141             Infer => GenericArg::Infer,
 142         }
 143     }
 144 }
 145
 146 impl FromWithTcx<clean::Constant> for Constant {
 147     fn from_tcx(constant: clean::Constant, tcx: TyCtxt<'_>) -> Self {
 148         let expr = constant.expr(tcx);
 149         let value = constant.value(tcx);
 150         let is_literal = constant.is_literal(tcx);
 151         Constant { type_: constant.type_.into_tcx(tcx), expr, value, is_literal }
 152     }
 153 }
 154
 155 impl FromWithTcx<clean::TypeBinding> for TypeBinding {
 156     fn from_tcx(binding: clean::TypeBinding, tcx: TyCtxt<'_>) -> Self {
 157         TypeBinding { name: binding.name.to_string(), binding: binding.kind.into_tcx(tcx) }
 158     }
 159 }
 160
 161 impl FromWithTcx<clean::TypeBindingKind> for TypeBindingKind {
 162     fn from_tcx(kind: clean::TypeBindingKind, tcx: TyCtxt<'_>) -> Self {
 163         use clean::TypeBindingKind::*;
 164         match kind {
 165             Equality { ty } => TypeBindingKind::Equality(ty.into_tcx(tcx)),
 166             Constraint { bounds } => {
 167                 TypeBindingKind::Constraint(bounds.into_iter().map(|a| a.into_tcx(tcx)).collect())
 168             }
 169         }
 170     }
 171 }
 172
 173 crate fn from_item_id(did: ItemId) -> Id {
 174     struct DisplayDefId(DefId);
 175
 176     impl fmt::Display for DisplayDefId {
 177         fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 178             write!(f, "{}:{}", self.0.krate.as_u32(), u32::from(self.0.index))
 179         }
 180     }
 181
 182     match did {
 183         ItemId::DefId(did) => Id(format!("{}", DisplayDefId(did))),
 184         ItemId::Blanket { for_, impl_id } => {
 185             Id(format!("b:{}-{}", DisplayDefId(impl_id), DisplayDefId(for_)))
 186         }
 187         ItemId::Auto { for_, trait_ } => {
 188             Id(format!("a:{}-{}", DisplayDefId(trait_), DisplayDefId(for_)))
 189         }
 190         ItemId::Primitive(ty, krate) => Id(format!("p:{}:{}", krate.as_u32(), ty.as_sym())),
 191     }
 192 }
 193
 194 fn from_clean_item(item: clean::Item, tcx: TyCtxt<'_>) -> ItemEnum {
 195     use clean::ItemKind::*;
 196     let name = item.name;
 197     let is_crate = item.is_crate();
 198     match *item.kind {
 199         ModuleItem(m) => ItemEnum::Module(Module { is_crate, items: ids(m.items) }),
 200         ImportItem(i) => ItemEnum::Import(i.into_tcx(tcx)),
 201         StructItem(s) => ItemEnum::Struct(s.into_tcx(tcx)),
 202         UnionItem(u) => ItemEnum::Union(u.into_tcx(tcx)),
 203         StructFieldItem(f) => ItemEnum::StructField(f.into_tcx(tcx)),
 204         EnumItem(e) => ItemEnum::Enum(e.into_tcx(tcx)),
 205         VariantItem(v) => ItemEnum::Variant(v.into_tcx(tcx)),
 206         FunctionItem(f) => ItemEnum::Function(f.into_tcx(tcx)),
 207         ForeignFunctionItem(f) => ItemEnum::Function(f.into_tcx(tcx)),
 208         TraitItem(t) => ItemEnum::Trait(t.into_tcx(tcx)),
 209         TraitAliasItem(t) => ItemEnum::TraitAlias(t.into_tcx(tcx)),
 210         MethodItem(m, _) => ItemEnum::Method(from_function_method(m, true, tcx)),
 211         TyMethodItem(m) => ItemEnum::Method(from_function_method(m, false, tcx)),
 212         ImplItem(i) => ItemEnum::Impl(i.into_tcx(tcx)),
 213         StaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 214         ForeignStaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 215         ForeignTypeItem => ItemEnum::ForeignType,
 216         TypedefItem(t, _) => ItemEnum::Typedef(t.into_tcx(tcx)),
 217         OpaqueTyItem(t) => ItemEnum::OpaqueTy(t.into_tcx(tcx)),
 218         ConstantItem(c) => ItemEnum::Constant(c.into_tcx(tcx)),
 219         MacroItem(m) => ItemEnum::Macro(m.source),
 220         ProcMacroItem(m) => ItemEnum::ProcMacro(m.into_tcx(tcx)),
 221         AssocConstItem(t, s) => ItemEnum::AssocConst { type_: t.into_tcx(tcx), default: s },
 222         AssocTypeItem(g, t) => ItemEnum::AssocType {
 223             bounds: g.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 224             default: t.map(|x| x.into_tcx(tcx)),
 225         },
 226         // `convert_item` early returns `None` for striped items
 227         StrippedItem(_) => unreachable!(),
 228         PrimitiveItem(_) | KeywordItem(_) => {
 229             panic!("{:?} is not supported for JSON output", item)
 230         }
 231         ExternCrateItem { ref src } => ItemEnum::ExternCrate {
 232             name: name.as_ref().unwrap().to_string(),
 233             rename: src.map(|x| x.to_string()),
 234         },
 235     }
 236 }
 237
 238 impl FromWithTcx<clean::Struct> for Struct {
 239     fn from_tcx(struct_: clean::Struct, tcx: TyCtxt<'_>) -> Self {
 240         let clean::Struct { struct_type, generics, fields, fields_stripped } = struct_;
 241         Struct {
 242             struct_type: from_ctor_kind(struct_type),
 243             generics: generics.into_tcx(tcx),
 244             fields_stripped,
 245             fields: ids(fields),
 246             impls: Vec::new(), // Added in JsonRenderer::item
 247         }
 248     }
 249 }
 250
 251 impl FromWithTcx<clean::Union> for Union {
 252     fn from_tcx(struct_: clean::Union, tcx: TyCtxt<'_>) -> Self {
 253         let clean::Union { generics, fields, fields_stripped } = struct_;
 254         Union {
 255             generics: generics.into_tcx(tcx),
 256             fields_stripped,
 257             fields: ids(fields),
 258             impls: Vec::new(), // Added in JsonRenderer::item
 259         }
 260     }
 261 }
 262
 263 crate fn from_ctor_kind(struct_type: CtorKind) -> StructType {
 264     match struct_type {
 265         CtorKind::Fictive => StructType::Plain,
 266         CtorKind::Fn => StructType::Tuple,
 267         CtorKind::Const => StructType::Unit,
 268     }
 269 }
 270
 271 crate fn from_fn_header(header: &rustc_hir::FnHeader) -> HashSet<Qualifiers> {
 272     let mut v = HashSet::new();
 273
 274     if let rustc_hir::Unsafety::Unsafe = header.unsafety {
 275         v.insert(Qualifiers::Unsafe);
 276     }
 277
 278     if let rustc_hir::IsAsync::Async = header.asyncness {
 279         v.insert(Qualifiers::Async);
 280     }
 281
 282     if let rustc_hir::Constness::Const = header.constness {
 283         v.insert(Qualifiers::Const);
 284     }
 285
 286     v
 287 }
 288
 289 impl FromWithTcx<clean::Function> for Function {
 290     fn from_tcx(function: clean::Function, tcx: TyCtxt<'_>) -> Self {
 291         let clean::Function { decl, generics, header } = function;
 292         Function {
 293             decl: decl.into_tcx(tcx),
 294             generics: generics.into_tcx(tcx),
 295             header: from_fn_header(&header),
 296             abi: header.abi.to_string(),
 297         }
 298     }
 299 }
 300
 301 impl FromWithTcx<clean::Generics> for Generics {
 302     fn from_tcx(generics: clean::Generics, tcx: TyCtxt<'_>) -> Self {
 303         Generics {
 304             params: generics.params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 305             where_predicates: generics
 306                 .where_predicates
 307                 .into_iter()
 308                 .map(|x| x.into_tcx(tcx))
 309                 .collect(),
 310         }
 311     }
 312 }
 313
 314 impl FromWithTcx<clean::GenericParamDef> for GenericParamDef {
 315     fn from_tcx(generic_param: clean::GenericParamDef, tcx: TyCtxt<'_>) -> Self {
 316         GenericParamDef {
 317             name: generic_param.name.to_string(),
 318             kind: generic_param.kind.into_tcx(tcx),
 319         }
 320     }
 321 }
 322
 323 impl FromWithTcx<clean::GenericParamDefKind> for GenericParamDefKind {
 324     fn from_tcx(kind: clean::GenericParamDefKind, tcx: TyCtxt<'_>) -> Self {
 325         use clean::GenericParamDefKind::*;
 326         match kind {
 327             Lifetime { outlives } => GenericParamDefKind::Lifetime {
 328                 outlives: outlives.into_iter().map(|lt| lt.0.to_string()).collect(),
 329             },
 330             Type { did: _, bounds, default, synthetic: _ } => GenericParamDefKind::Type {
 331                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 332                 default: default.map(|x| x.into_tcx(tcx)),
 333             },
 334             Const { did: _, ty, default } => {
 335                 GenericParamDefKind::Const { ty: ty.into_tcx(tcx), default }
 336             }
 337         }
 338     }
 339 }
 340
 341 impl FromWithTcx<clean::WherePredicate> for WherePredicate {
 342     fn from_tcx(predicate: clean::WherePredicate, tcx: TyCtxt<'_>) -> Self {
 343         use clean::WherePredicate::*;
 344         match predicate {
 345             BoundPredicate { ty, bounds, .. } => WherePredicate::BoundPredicate {
 346                 ty: ty.into_tcx(tcx),
 347                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 348                 // FIXME: add `bound_params` to rustdoc-json-params?
 349             },
 350             RegionPredicate { lifetime, bounds } => WherePredicate::RegionPredicate {
 351                 lifetime: lifetime.0.to_string(),
 352                 bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 353             },
 354             EqPredicate { lhs, rhs } => {
 355                 WherePredicate::EqPredicate { lhs: lhs.into_tcx(tcx), rhs: rhs.into_tcx(tcx) }
 356             }
 357         }
 358     }
 359 }
 360
 361 impl FromWithTcx<clean::GenericBound> for GenericBound {
 362     fn from_tcx(bound: clean::GenericBound, tcx: TyCtxt<'_>) -> Self {
 363         use clean::GenericBound::*;
 364         match bound {
 365             TraitBound(clean::PolyTrait { trait_, generic_params }, modifier) => {
 366                 GenericBound::TraitBound {
 367                     trait_: trait_.into_tcx(tcx),
 368                     generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 369                     modifier: from_trait_bound_modifier(modifier),
 370                 }
 371             }
 372             Outlives(lifetime) => GenericBound::Outlives(lifetime.0.to_string()),
 373         }
 374     }
 375 }
 376
 377 crate fn from_trait_bound_modifier(modifier: rustc_hir::TraitBoundModifier) -> TraitBoundModifier {
 378     use rustc_hir::TraitBoundModifier::*;
 379     match modifier {
 380         None => TraitBoundModifier::None,
 381         Maybe => TraitBoundModifier::Maybe,
 382         MaybeConst => TraitBoundModifier::MaybeConst,
 383     }
 384 }
 385
 386 impl FromWithTcx<clean::Type> for Type {
 387     fn from_tcx(ty: clean::Type, tcx: TyCtxt<'_>) -> Self {
 388         use clean::Type::*;
 389         match ty {
 390             ResolvedPath { path, did, is_generic: _ } => Type::ResolvedPath {
 391                 name: path.whole_name(),
 392                 id: from_item_id(did.into()),
 393                 args: path.segments.last().map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 394                 param_names: Vec::new(),
 395             },
 396             DynTrait(mut bounds, lt) => {
 397                 let (path, id) = match bounds.remove(0).trait_ {
 398                     ResolvedPath { path, did, .. } => (path, did),
 399                     _ => unreachable!(),
 400                 };
 401
 402                 Type::ResolvedPath {
 403                     name: path.whole_name(),
 404                     id: from_item_id(id.into()),
 405                     args: path
 406                         .segments
 407                         .last()
 408                         .map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 409                     param_names: bounds
 410                         .into_iter()
 411                         .map(|t| {
 412                             clean::GenericBound::TraitBound(t, rustc_hir::TraitBoundModifier::None)
 413                         })
 414                         .chain(lt.into_iter().map(|lt| clean::GenericBound::Outlives(lt)))
 415                         .map(|bound| bound.into_tcx(tcx))
 416                         .collect(),
 417                 }
 418             }
 419             Generic(s) => Type::Generic(s.to_string()),
 420             Primitive(p) => Type::Primitive(p.as_sym().to_string()),
 421             BareFunction(f) => Type::FunctionPointer(Box::new((*f).into_tcx(tcx))),
 422             Tuple(t) => Type::Tuple(t.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 423             Slice(t) => Type::Slice(Box::new((*t).into_tcx(tcx))),
 424             Array(t, s) => Type::Array { type_: Box::new((*t).into_tcx(tcx)), len: s },
 425             ImplTrait(g) => Type::ImplTrait(g.into_iter().map(|x| x.into_tcx(tcx)).collect()),
 426             Never => Type::Never,
 427             Infer => Type::Infer,
 428             RawPointer(mutability, type_) => Type::RawPointer {
 429                 mutable: mutability == ast::Mutability::Mut,
 430                 type_: Box::new((*type_).into_tcx(tcx)),
 431             },
 432             BorrowedRef { lifetime, mutability, type_ } => Type::BorrowedRef {
 433                 lifetime: lifetime.map(|l| l.0.to_string()),
 434                 mutable: mutability == ast::Mutability::Mut,
 435                 type_: Box::new((*type_).into_tcx(tcx)),
 436             },
 437             QPath { name, self_type, trait_, .. } => Type::QualifiedPath {
 438                 name: name.to_string(),
 439                 self_type: Box::new((*self_type).into_tcx(tcx)),
 440                 trait_: Box::new((*trait_).into_tcx(tcx)),
 441             },
 442         }
 443     }
 444 }
 445
 446 impl FromWithTcx<clean::BareFunctionDecl> for FunctionPointer {
 447     fn from_tcx(bare_decl: clean::BareFunctionDecl, tcx: TyCtxt<'_>) -> Self {
 448         let clean::BareFunctionDecl { unsafety, generic_params, decl, abi } = bare_decl;
 449         FunctionPointer {
 450             header: if let rustc_hir::Unsafety::Unsafe = unsafety {
 451                 let mut hs = HashSet::new();
 452                 hs.insert(Qualifiers::Unsafe);
 453                 hs
 454             } else {
 455                 HashSet::new()
 456             },
 457             generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 458             decl: decl.into_tcx(tcx),
 459             abi: abi.to_string(),
 460         }
 461     }
 462 }
 463
 464 impl FromWithTcx<clean::FnDecl> for FnDecl {
 465     fn from_tcx(decl: clean::FnDecl, tcx: TyCtxt<'_>) -> Self {
 466         let clean::FnDecl { inputs, output, c_variadic } = decl;
 467         FnDecl {
 468             inputs: inputs
 469                 .values
 470                 .into_iter()
 471                 .map(|arg| (arg.name.to_string(), arg.type_.into_tcx(tcx)))
 472                 .collect(),
 473             output: match output {
 474                 clean::FnRetTy::Return(t) => Some(t.into_tcx(tcx)),
 475                 clean::FnRetTy::DefaultReturn => None,
 476             },
 477             c_variadic,
 478         }
 479     }
 480 }
 481
 482 impl FromWithTcx<clean::Trait> for Trait {
 483     fn from_tcx(trait_: clean::Trait, tcx: TyCtxt<'_>) -> Self {
 484         let clean::Trait { unsafety, items, generics, bounds, is_auto } = trait_;
 485         Trait {
 486             is_auto,
 487             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 488             items: ids(items),
 489             generics: generics.into_tcx(tcx),
 490             bounds: bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 491             implementors: Vec::new(), // Added in JsonRenderer::item
 492         }
 493     }
 494 }
 495
 496 impl FromWithTcx<clean::Impl> for Impl {
 497     fn from_tcx(impl_: clean::Impl, tcx: TyCtxt<'_>) -> Self {
 498         let provided_trait_methods = impl_.provided_trait_methods(tcx);
 499         let clean::Impl {
 500             unsafety,
 501             generics,
 502             trait_,
 503             for_,
 504             items,
 505             negative_polarity,
 506             synthetic,
 507             blanket_impl,
 508             span: _span,
 509         } = impl_;
 510         Impl {
 511             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 512             generics: generics.into_tcx(tcx),
 513             provided_trait_methods: provided_trait_methods
 514                 .into_iter()
 515                 .map(|x| x.to_string())
 516                 .collect(),
 517             trait_: trait_.map(|x| x.into_tcx(tcx)),
 518             for_: for_.into_tcx(tcx),
 519             items: ids(items),
 520             negative: negative_polarity,
 521             synthetic,
 522             blanket_impl: blanket_impl.map(|x| (*x).into_tcx(tcx)),
 523         }
 524     }
 525 }
 526
 527 crate fn from_function_method(
 528     function: clean::Function,
 529     has_body: bool,
 530     tcx: TyCtxt<'_>,
 531 ) -> Method {
 532     let clean::Function { header, decl, generics } = function;
 533     Method {
 534         decl: decl.into_tcx(tcx),
 535         generics: generics.into_tcx(tcx),
 536         header: from_fn_header(&header),
 537         abi: header.abi.to_string(),
 538         has_body,
 539     }
 540 }
 541
 542 impl FromWithTcx<clean::Enum> for Enum {
 543     fn from_tcx(enum_: clean::Enum, tcx: TyCtxt<'_>) -> Self {
 544         let clean::Enum { variants, generics, variants_stripped } = enum_;
 545         Enum {
 546             generics: generics.into_tcx(tcx),
 547             variants_stripped,
 548             variants: ids(variants),
 549             impls: Vec::new(), // Added in JsonRenderer::item
 550         }
 551     }
 552 }
 553
 554 impl FromWithTcx<clean::VariantStruct> for Struct {
 555     fn from_tcx(struct_: clean::VariantStruct, _tcx: TyCtxt<'_>) -> Self {
 556         let clean::VariantStruct { struct_type, fields, fields_stripped } = struct_;
 557         Struct {
 558             struct_type: from_ctor_kind(struct_type),
 559             generics: Default::default(),
 560             fields_stripped,
 561             fields: ids(fields),
 562             impls: Vec::new(),
 563         }
 564     }
 565 }
 566
 567 impl FromWithTcx<clean::Variant> for Variant {
 568     fn from_tcx(variant: clean::Variant, tcx: TyCtxt<'_>) -> Self {
 569         use clean::Variant::*;
 570         match variant {
 571             CLike => Variant::Plain,
 572             Tuple(fields) => Variant::Tuple(
 573                 fields
 574                     .into_iter()
 575                     .map(|f| {
 576                         if let clean::StructFieldItem(ty) = *f.kind {
 577                             ty.into_tcx(tcx)
 578                         } else {
 579                             unreachable!()
 580                         }
 581                     })
 582                     .collect(),
 583             ),
 584             Struct(s) => Variant::Struct(ids(s.fields)),
 585         }
 586     }
 587 }
 588
 589 impl FromWithTcx<clean::Import> for Import {
 590     fn from_tcx(import: clean::Import, _tcx: TyCtxt<'_>) -> Self {
 591         use clean::ImportKind::*;
 592         match import.kind {
 593             Simple(s) => Import {
 594                 source: import.source.path.whole_name(),
 595                 name: s.to_string(),
 596                 id: import.source.did.map(ItemId::from).map(from_item_id),
 597                 glob: false,
 598             },
 599             Glob => Import {
 600                 source: import.source.path.whole_name(),
 601                 name: import.source.path.last_name().to_string(),
 602                 id: import.source.did.map(ItemId::from).map(from_item_id),
 603                 glob: true,
 604             },
 605         }
 606     }
 607 }
 608
 609 impl FromWithTcx<clean::ProcMacro> for ProcMacro {
 610     fn from_tcx(mac: clean::ProcMacro, _tcx: TyCtxt<'_>) -> Self {
 611         ProcMacro {
 612             kind: from_macro_kind(mac.kind),
 613             helpers: mac.helpers.iter().map(|x| x.to_string()).collect(),
 614         }
 615     }
 616 }
 617
 618 crate fn from_macro_kind(kind: rustc_span::hygiene::MacroKind) -> MacroKind {
 619     use rustc_span::hygiene::MacroKind::*;
 620     match kind {
 621         Bang => MacroKind::Bang,
 622         Attr => MacroKind::Attr,
 623         Derive => MacroKind::Derive,
 624     }
 625 }
 626
 627 impl FromWithTcx<clean::Typedef> for Typedef {
 628     fn from_tcx(typedef: clean::Typedef, tcx: TyCtxt<'_>) -> Self {
 629         let clean::Typedef { type_, generics, item_type: _ } = typedef;
 630         Typedef { type_: type_.into_tcx(tcx), generics: generics.into_tcx(tcx) }
 631     }
 632 }
 633
 634 impl FromWithTcx<clean::OpaqueTy> for OpaqueTy {
 635     fn from_tcx(opaque: clean::OpaqueTy, tcx: TyCtxt<'_>) -> Self {
 636         OpaqueTy {
 637             bounds: opaque.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 638             generics: opaque.generics.into_tcx(tcx),
 639         }
 640     }
 641 }
 642
 643 impl FromWithTcx<clean::Static> for Static {
 644     fn from_tcx(stat: clean::Static, tcx: TyCtxt<'_>) -> Self {
 645         Static {
 646             type_: stat.type_.into_tcx(tcx),
 647             mutable: stat.mutability == ast::Mutability::Mut,
 648             expr: stat.expr.map(|e| print_const_expr(tcx, e)).unwrap_or_default(),
 649         }
 650     }
 651 }
 652
 653 impl FromWithTcx<clean::TraitAlias> for TraitAlias {
 654     fn from_tcx(alias: clean::TraitAlias, tcx: TyCtxt<'_>) -> Self {
 655         TraitAlias {
 656             generics: alias.generics.into_tcx(tcx),
 657             params: alias.bounds.into_iter().map(|x| x.into_tcx(tcx)).collect(),
 658         }
 659     }
 660 }
 661
 662 impl FromWithTcx<ItemType> for ItemKind {
 663     fn from_tcx(kind: ItemType, _tcx: TyCtxt<'_>) -> Self {
 664         use ItemType::*;
 665         match kind {
 666             Module => ItemKind::Module,
 667             ExternCrate => ItemKind::ExternCrate,
 668             Import => ItemKind::Import,
 669             Struct => ItemKind::Struct,
 670             Union => ItemKind::Union,
 671             Enum => ItemKind::Enum,
 672             Function => ItemKind::Function,
 673             Typedef => ItemKind::Typedef,
 674             OpaqueTy => ItemKind::OpaqueTy,
 675             Static => ItemKind::Static,
 676             Constant => ItemKind::Constant,
 677             Trait => ItemKind::Trait,
 678             Impl => ItemKind::Impl,
 679             TyMethod | Method => ItemKind::Method,
 680             StructField => ItemKind::StructField,
 681             Variant => ItemKind::Variant,
 682             Macro => ItemKind::Macro,
 683             Primitive => ItemKind::Primitive,
 684             AssocConst => ItemKind::AssocConst,
 685             AssocType => ItemKind::AssocType,
 686             ForeignType => ItemKind::ForeignType,
 687             Keyword => ItemKind::Keyword,
 688             TraitAlias => ItemKind::TraitAlias,
 689             ProcAttribute => ItemKind::ProcAttribute,
 690             ProcDerive => ItemKind::ProcDerive,
 691         }
 692     }
 693 }
 694
 695 fn ids(items: impl IntoIterator<Item = clean::Item>) -> Vec<Id> {
 696     items.into_iter().filter(|x| !x.is_stripped()).map(|i| from_item_id(i.def_id)).collect()
 697 }