1 //! Rustdoc's JSON backend
3 //! This module contains the logic for rendering a crate as JSON rather than the normal static HTML
4 //! output. See [the RFC](https://github.com/rust-lang/rfcs/pull/2963) and the [`types`] module
5 //! docs for usage and details.
9 use std
::cell
::RefCell
;
11 use std
::path
::PathBuf
;
14 use rustc_data_structures
::fx
::FxHashMap
;
15 use rustc_middle
::ty
::TyCtxt
;
16 use rustc_session
::Session
;
17 use rustc_span
::edition
::Edition
;
19 use rustdoc_json_types
as types
;
22 use crate::config
::RenderOptions
;
23 use crate::error
::Error
;
24 use crate::formats
::cache
::Cache
;
25 use crate::formats
::FormatRenderer
;
26 use crate::html
::render
::cache
::ExternalLocation
;
27 use crate::json
::conversions
::from_def_id
;
30 crate struct JsonRenderer
<'tcx
> {
32 /// A mapping of IDs that contains all local items for this crate which gets output as a top
33 /// level field of the JSON blob.
34 index
: Rc
<RefCell
<FxHashMap
<types
::Id
, types
::Item
>>>,
35 /// The directory where the blob will be written to.
40 impl JsonRenderer
<'tcx
> {
41 fn sess(&self) -> &'tcx Session
{
45 fn get_trait_implementors(&mut self, id
: rustc_span
::def_id
::DefId
) -> Vec
<types
::Id
> {
46 Rc
::clone(&self.cache
)
53 let item
= &i
.impl_item
;
54 self.item(item
.clone()).unwrap();
55 from_def_id(item
.def_id
)
62 fn get_impls(&mut self, id
: rustc_span
::def_id
::DefId
) -> Vec
<types
::Id
> {
63 Rc
::clone(&self.cache
)
70 let item
= &i
.impl_item
;
71 if item
.def_id
.is_local() {
72 self.item(item
.clone()).unwrap();
73 Some(from_def_id(item
.def_id
))
83 fn get_trait_items(&mut self) -> Vec
<(types
::Id
, types
::Item
)> {
84 Rc
::clone(&self.cache
)
87 .filter_map(|(&id
, trait_item
)| {
88 // only need to synthesize items for external traits
90 let trait_item
= &trait_item
.trait_
;
91 trait_item
.items
.clone().into_iter().for_each(|i
| self.item(i
).unwrap());
96 crate_id
: id
.krate
.as_u32(),
105 .expect("Trait should either be in local or external paths")
110 visibility
: types
::Visibility
::Public
,
111 inner
: types
::ItemEnum
::Trait(trait_item
.clone().into()),
113 docs
: Default
::default(),
114 links
: Default
::default(),
115 attrs
: Default
::default(),
116 deprecation
: Default
::default(),
127 impl<'tcx
> FormatRenderer
<'tcx
> for JsonRenderer
<'tcx
> {
128 fn descr() -> &'
static str {
134 options
: RenderOptions
,
138 ) -> Result
<(Self, clean
::Crate
), Error
> {
139 debug
!("Initializing json renderer");
143 index
: Rc
::new(RefCell
::new(FxHashMap
::default())),
144 out_path
: options
.output
,
145 cache
: Rc
::new(cache
),
151 fn make_child_renderer(&self) -> Self {
155 /// Inserts an item into the index. This should be used rather than directly calling insert on
156 /// the hashmap because certain items (traits and types) need to have their mappings for trait
157 /// implementations filled out before they're inserted.
158 fn item(&mut self, item
: clean
::Item
) -> Result
<(), Error
> {
159 // Flatten items that recursively store other items
160 item
.kind
.inner_items().for_each(|i
| self.item(i
.clone()).unwrap());
162 let id
= item
.def_id
;
163 if let Some(mut new_item
) = self.convert_item(item
) {
164 if let types
::ItemEnum
::Trait(ref mut t
) = new_item
.inner
{
165 t
.implementors
= self.get_trait_implementors(id
)
166 } else if let types
::ItemEnum
::Struct(ref mut s
) = new_item
.inner
{
167 s
.impls
= self.get_impls(id
)
168 } else if let types
::ItemEnum
::Enum(ref mut e
) = new_item
.inner
{
169 e
.impls
= self.get_impls(id
)
171 let removed
= self.index
.borrow_mut().insert(from_def_id(id
), new_item
.clone());
172 // FIXME(adotinthevoid): Currently, the index is duplicated. This is a sanity check
173 // to make sure the items are unique.
174 if let Some(old_item
) = removed
{
175 assert_eq
!(old_item
, new_item
);
182 fn mod_item_in(&mut self, item
: &clean
::Item
, _module_name
: &str) -> Result
<(), Error
> {
183 use clean
::types
::ItemKind
::*;
184 if let ModuleItem(m
) = &*item
.kind
{
185 for item
in &m
.items
{
187 // These don't have names so they don't get added to the output by default
188 ImportItem(_
) => self.item(item
.clone()).unwrap(),
189 ExternCrateItem { .. }
=> self.item(item
.clone()).unwrap(),
190 ImplItem(i
) => i
.items
.iter().for_each(|i
| self.item(i
.clone()).unwrap()),
195 self.item(item
.clone()).unwrap();
199 fn mod_item_out(&mut self, _item_name
: &str) -> Result
<(), Error
> {
205 _krate
: &clean
::Crate
,
206 _diag
: &rustc_errors
::Handler
,
207 ) -> Result
<(), Error
> {
208 debug
!("Done with crate");
209 let mut index
= (*self.index
).clone().into_inner();
210 index
.extend(self.get_trait_items());
211 // This needs to be the default HashMap for compatibility with the public interface for
213 #[allow(rustc::default_hash_types)]
214 let output
= types
::Crate
{
215 root
: types
::Id(String
::from("0:0")),
216 crate_version
: self.cache
.crate_version
.clone(),
217 includes_private
: self.cache
.document_private
,
218 index
: index
.into_iter().collect(),
224 .chain(self.cache
.external_paths
.clone().into_iter())
225 .map(|(k
, (path
, kind
))| {
228 types
::ItemSummary { crate_id: k.krate.as_u32(), path, kind: kind.into() }
,
232 external_crates
: self
239 types
::ExternalCrate
{
240 name
: v
.0.to_string(),
241 html_root_url
: match &v
.2 {
242 ExternalLocation
::Remote(s
) => Some(s
.clone()),
251 let mut p
= self.out_path
.clone();
252 p
.push(output
.index
.get(&output
.root
).unwrap().name
.clone().unwrap());
253 p
.set_extension("json");
254 let file
= File
::create(&p
).map_err(|error
| Error { error: error.to_string(), file: p }
)?
;
255 serde_json
::ser
::to_writer(&file
, &output
).unwrap();
259 fn cache(&self) -> &Cache
{