1 use std::cell::RefCell;
2 use std::collections::BTreeMap;
4 use std::path::{Path, PathBuf};
6 use std::sync::mpsc::{channel, Receiver};
8 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
9 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
10 use rustc_middle::ty::TyCtxt;
11 use rustc_session::Session;
12 use rustc_span::edition::Edition;
13 use rustc_span::source_map::FileName;
14 use rustc_span::{symbol::sym, Symbol};
16 use super::cache::{build_index, ExternalLocation};
17 use super::print_item::{full_path, item_path, print_item};
18 use super::write_shared::write_shared;
19 use super::{print_sidebar, settings, AllTypes, NameDoc, StylePath, BASIC_KEYWORDS};
21 use crate::clean::{self, AttributesExt};
22 use crate::config::RenderOptions;
23 use crate::docfs::{DocFS, PathError};
24 use crate::error::Error;
25 use crate::formats::cache::Cache;
26 use crate::formats::item_type::ItemType;
27 use crate::formats::FormatRenderer;
28 use crate::html::escape::Escape;
29 use crate::html::format::Buffer;
30 use crate::html::markdown::{self, plain_text_summary, ErrorCodes, IdMap};
31 use crate::html::{layout, sources};
33 /// Major driving force in all rustdoc rendering. This contains information
34 /// about where in the tree-like hierarchy rendering is occurring and controls
35 /// how the current page is being rendered.
37 /// It is intended that this context is a lightweight object which can be fairly
38 /// easily cloned because it is cloned per work-job (about once per item in the
40 crate struct Context<'tcx> {
41 /// Current hierarchy of components leading down to what's currently being
43 pub(crate) current: Vec<String>,
44 /// The current destination folder of where HTML artifacts should be placed.
45 /// This changes as the context descends into the module hierarchy.
46 pub(super) dst: PathBuf,
47 /// A flag, which when `true`, will render pages which redirect to the
48 /// real location of an item. This is used to allow external links to
49 /// publicly reused items to redirect to the right location.
50 pub(super) render_redirect_pages: bool,
51 /// The map used to ensure all generated 'id=' attributes are unique.
52 pub(super) id_map: RefCell<IdMap>,
53 /// Tracks section IDs for `Deref` targets so they match in both the main
54 /// body and the sidebar.
55 pub(super) deref_id_map: RefCell<FxHashMap<DefId, String>>,
56 /// Shared mutable state.
58 /// Issue for improving the situation: [#82381][]
60 /// [#82381]: https://github.com/rust-lang/rust/issues/82381
61 pub(super) shared: Rc<SharedContext<'tcx>>,
62 /// The [`Cache`] used during rendering.
64 /// Ideally the cache would be in [`SharedContext`], but it's mutated
65 /// between when the `SharedContext` is created and when `Context`
66 /// is created, so more refactoring would be needed.
68 /// It's immutable once in `Context`, so it's not as bad that it's not in
70 // FIXME: move `cache` to `SharedContext`
71 pub(super) cache: Rc<Cache>,
74 // `Context` is cloned a lot, so we don't want the size to grow unexpectedly.
75 #[cfg(target_arch = "x86_64")]
76 rustc_data_structures::static_assert_size!(Context<'_>, 152);
78 /// Shared mutable state used in [`Context`] and elsewhere.
79 crate struct SharedContext<'tcx> {
80 crate tcx: TyCtxt<'tcx>,
81 /// The path to the crate root source minus the file name.
82 /// Used for simplifying paths to the highlighted source code files.
83 crate src_root: PathBuf,
84 /// This describes the layout of each page, and is not modified after
85 /// creation of the context (contains info like the favicon and added html).
86 crate layout: layout::Layout,
87 /// This flag indicates whether `[src]` links should be generated or not. If
88 /// the source files are present in the html rendering, then this will be
90 crate include_sources: bool,
91 /// The local file sources we've emitted and their respective url-paths.
92 crate local_sources: FxHashMap<PathBuf, String>,
93 /// Whether the collapsed pass ran
95 /// The base-URL of the issue tracker for when an item has been tagged with
97 pub(super) issue_tracker_base_url: Option<String>,
98 /// The directories that have already been created in this doc run. Used to reduce the number
99 /// of spurious `create_dir_all` calls.
100 created_dirs: RefCell<FxHashSet<PathBuf>>,
101 /// This flag indicates whether listings of modules (in the side bar and documentation itself)
102 /// should be ordered alphabetically or in order of appearance (in the source code).
103 pub(super) sort_modules_alphabetically: bool,
104 /// Additional CSS files to be added to the generated docs.
105 crate style_files: Vec<StylePath>,
106 /// Suffix to be added on resource files (if suffix is "-v2" then "light.css" becomes
108 crate resource_suffix: String,
109 /// Optional path string to be used to load static files on output pages. If not set, uses
110 /// combinations of `../` to reach the documentation root.
111 crate static_root_path: Option<String>,
112 /// The fs handle we are working with.
114 /// The default edition used to parse doctests.
115 crate edition: Edition,
116 pub(super) codes: ErrorCodes,
117 pub(super) playground: Option<markdown::Playground>,
118 all: RefCell<AllTypes>,
119 /// Storage for the errors produced while generating documentation so they
120 /// can be printed together at the end.
121 errors: Receiver<String>,
122 /// `None` by default, depends on the `generate-redirect-map` option flag. If this field is set
123 /// to `Some(...)`, it'll store redirections and then generate a JSON file at the top level of
125 redirections: Option<RefCell<FxHashMap<String, String>>>,
128 impl SharedContext<'_> {
129 crate fn ensure_dir(&self, dst: &Path) -> Result<(), Error> {
130 let mut dirs = self.created_dirs.borrow_mut();
131 if !dirs.contains(dst) {
132 try_err!(self.fs.create_dir_all(dst), dst);
133 dirs.insert(dst.to_path_buf());
139 /// Based on whether the `collapse-docs` pass was run, return either the `doc_value` or the
140 /// `collapsed_doc_value` of the given item.
141 crate fn maybe_collapsed_doc_value<'a>(&self, item: &'a clean::Item) -> Option<String> {
142 if self.collapsed { item.collapsed_doc_value() } else { item.doc_value() }
146 impl<'tcx> Context<'tcx> {
147 pub(crate) fn tcx(&self) -> TyCtxt<'tcx> {
151 pub(crate) fn cache(&self) -> &Cache {
155 fn sess(&self) -> &'tcx Session {
156 &self.shared.tcx.sess
159 pub(super) fn derive_id(&self, id: String) -> String {
160 let mut map = self.id_map.borrow_mut();
164 /// String representation of how to get back to the root path of the 'doc/'
165 /// folder in terms of a relative URL.
166 pub(super) fn root_path(&self) -> String {
167 "../".repeat(self.current.len())
170 fn render_item(&self, it: &clean::Item, pushname: bool) -> String {
171 let mut title = if it.is_primitive() || it.is_keyword() {
172 // No need to include the namespace for primitive types and keywords
175 self.current.join("::")
178 if !title.is_empty() {
179 title.push_str("::");
181 title.push_str(&it.name.unwrap().as_str());
183 title.push_str(" - Rust");
184 let tyname = it.type_();
185 let desc = it.doc_value().as_ref().map(|doc| plain_text_summary(&doc));
186 let desc = if let Some(desc) = desc {
188 } else if it.is_crate() {
189 format!("API documentation for the Rust `{}` crate.", self.shared.layout.krate)
192 "API documentation for the Rust `{}` {} in crate `{}`.",
193 it.name.as_ref().unwrap(),
195 self.shared.layout.krate
198 let keywords = make_item_keywords(it);
199 let page = layout::Page {
200 css_class: tyname.as_str(),
201 root_path: &self.root_path(),
202 static_root_path: self.shared.static_root_path.as_deref(),
206 resource_suffix: &self.shared.resource_suffix,
208 static_extra_scripts: &[],
211 if !self.render_redirect_pages {
215 |buf: &mut _| print_sidebar(self, it, buf),
216 |buf: &mut _| print_item(self, it, buf),
217 &self.shared.style_files,
220 if let Some(&(ref names, ty)) = self.cache.paths.get(&it.def_id) {
221 let mut path = String::new();
222 for name in &names[..names.len() - 1] {
226 path.push_str(&item_path(ty, names.last().unwrap()));
227 match self.shared.redirections {
228 Some(ref redirections) => {
229 let mut current_path = String::new();
230 for name in &self.current {
231 current_path.push_str(name);
232 current_path.push('/');
234 current_path.push_str(&item_path(ty, names.last().unwrap()));
235 redirections.borrow_mut().insert(current_path, path);
237 None => return layout::redirect(&format!("{}{}", self.root_path(), path)),
244 /// Construct a map of items shown in the sidebar to a plain-text summary of their docs.
245 fn build_sidebar_items(&self, m: &clean::Module) -> BTreeMap<String, Vec<NameDoc>> {
246 // BTreeMap instead of HashMap to get a sorted output
247 let mut map: BTreeMap<_, Vec<_>> = BTreeMap::new();
248 for item in &m.items {
249 if item.is_stripped() {
253 let short = item.type_();
254 let myname = match item.name {
256 Some(ref s) => s.to_string(),
258 let short = short.to_string();
259 map.entry(short).or_default().push((
261 Some(item.doc_value().map_or_else(String::new, |s| plain_text_summary(&s))),
265 if self.shared.sort_modules_alphabetically {
266 for items in map.values_mut() {
273 /// Generates a url appropriate for an `href` attribute back to the source of
276 /// The url generated, when clicked, will redirect the browser back to the
277 /// original source code.
279 /// If `None` is returned, then a source link couldn't be generated. This
280 /// may happen, for example, with externally inlined items where the source
281 /// of their crate documentation isn't known.
282 pub(super) fn src_href(&self, item: &clean::Item) -> Option<String> {
283 if item.span.is_dummy() {
286 let mut root = self.root_path();
287 let mut path = String::new();
288 let cnum = item.span.cnum(self.sess());
290 // We can safely ignore synthetic `SourceFile`s.
291 let file = match item.span.filename(self.sess()) {
292 FileName::Real(ref path) => path.local_path().to_path_buf(),
298 let (krate, path) = if cnum == LOCAL_CRATE {
299 if let Some(path) = self.shared.local_sources.get(file) {
300 (self.shared.layout.krate.as_str(), path)
305 let (krate, src_root) = match *self.cache.extern_locations.get(&cnum)? {
306 (name, ref src, ExternalLocation::Local) => (name, src),
307 (name, ref src, ExternalLocation::Remote(ref s)) => {
308 root = s.to_string();
311 (_, _, ExternalLocation::Unknown) => return None,
314 sources::clean_path(&src_root, file, false, |component| {
315 path.push_str(&component.to_string_lossy());
318 let mut fname = file.file_name().expect("source has no filename").to_os_string();
320 path.push_str(&fname.to_string_lossy());
321 symbol = krate.as_str();
325 let loline = item.span.lo(self.sess()).line;
326 let hiline = item.span.hi(self.sess()).line;
328 if loline == hiline { loline.to_string() } else { format!("{}-{}", loline, hiline) };
330 "{root}src/{krate}/{path}#{lines}",
331 root = Escape(&root),
339 /// Generates the documentation for `crate` into the directory `dst`
340 impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
341 fn descr() -> &'static str {
345 const RUN_ON_MODULE: bool = true;
348 mut krate: clean::Crate,
349 options: RenderOptions,
353 ) -> Result<(Self, clean::Crate), Error> {
354 // need to save a copy of the options for rendering the index page
355 let md_opts = options.clone();
356 let emit_crate = options.should_emit_crate();
362 sort_modules_alphabetically,
368 generate_search_filter,
370 generate_redirect_map,
374 let src_root = match krate.src {
375 FileName::Real(ref p) => match p.local_path().parent() {
376 Some(p) => p.to_path_buf(),
377 None => PathBuf::new(),
381 // If user passed in `--playground-url` arg, we fill in crate name here
382 let mut playground = None;
383 if let Some(url) = playground_url {
385 Some(markdown::Playground { crate_name: Some(krate.name.to_string()), url });
387 let mut layout = layout::Layout {
389 favicon: String::new(),
392 krate: krate.name.to_string(),
393 css_file_extension: extension_css,
394 generate_search_filter,
396 let mut issue_tracker_base_url = None;
397 let mut include_sources = true;
399 // Crawl the crate attributes looking for attributes which control how we're
400 // going to emit HTML
401 for attr in krate.module.attrs.lists(sym::doc) {
402 match (attr.name_or_empty(), attr.value_str()) {
403 (sym::html_favicon_url, Some(s)) => {
404 layout.favicon = s.to_string();
406 (sym::html_logo_url, Some(s)) => {
407 layout.logo = s.to_string();
409 (sym::html_playground_url, Some(s)) => {
410 playground = Some(markdown::Playground {
411 crate_name: Some(krate.name.to_string()),
415 (sym::issue_tracker_base_url, Some(s)) => {
416 issue_tracker_base_url = Some(s.to_string());
418 (sym::html_no_source, None) if attr.is_word() => {
419 include_sources = false;
424 let (sender, receiver) = channel();
425 let mut scx = SharedContext {
427 collapsed: krate.collapsed,
430 local_sources: Default::default(),
431 issue_tracker_base_url,
433 created_dirs: Default::default(),
434 sort_modules_alphabetically,
438 fs: DocFS::new(sender),
440 codes: ErrorCodes::from(unstable_features.is_nightly_build()),
442 all: RefCell::new(AllTypes::new()),
444 redirections: if generate_redirect_map { Some(Default::default()) } else { None },
447 // Add the default themes to the `Vec` of stylepaths
449 // Note that these must be added before `sources::render` is called
450 // so that the resulting source pages are styled
452 // `light.css` is not disabled because it is the stylesheet that stays loaded
453 // by the browser as the theme stylesheet. The theme system (hackily) works by
454 // changing the href to this stylesheet. All other themes are disabled to
455 // prevent rule conflicts
456 scx.style_files.push(StylePath { path: PathBuf::from("light.css"), disabled: false });
457 scx.style_files.push(StylePath { path: PathBuf::from("dark.css"), disabled: true });
458 scx.style_files.push(StylePath { path: PathBuf::from("ayu.css"), disabled: true });
461 scx.ensure_dir(&dst)?;
463 krate = sources::render(&dst, &mut scx, krate)?;
466 // Build our search index
467 let index = build_index(&krate, &mut cache, tcx);
469 let mut cx = Context {
472 render_redirect_pages: false,
473 id_map: RefCell::new(id_map),
474 deref_id_map: RefCell::new(FxHashMap::default()),
475 shared: Rc::new(scx),
476 cache: Rc::new(cache),
479 // Write shared runs within a flock; disable thread dispatching of IO temporarily.
480 Rc::get_mut(&mut cx.shared).unwrap().fs.set_sync_only(true);
481 write_shared(&cx, &krate, index, &md_opts)?;
482 Rc::get_mut(&mut cx.shared).unwrap().fs.set_sync_only(false);
486 fn make_child_renderer(&self) -> Self {
488 current: self.current.clone(),
489 dst: self.dst.clone(),
490 render_redirect_pages: self.render_redirect_pages,
491 id_map: RefCell::new(IdMap::new()),
492 deref_id_map: RefCell::new(FxHashMap::default()),
493 shared: Rc::clone(&self.shared),
494 cache: Rc::clone(&self.cache),
501 diag: &rustc_errors::Handler,
502 ) -> Result<(), Error> {
503 let final_file = self.dst.join(&*crate_name.as_str()).join("all.html");
504 let settings_file = self.dst.join("settings.html");
506 let mut root_path = self.dst.to_str().expect("invalid path").to_owned();
507 if !root_path.ends_with('/') {
510 let mut page = layout::Page {
511 title: "List of all items in this crate",
514 static_root_path: self.shared.static_root_path.as_deref(),
515 description: "List of all items in this crate",
516 keywords: BASIC_KEYWORDS,
517 resource_suffix: &self.shared.resource_suffix,
519 static_extra_scripts: &[],
521 let sidebar = if let Some(ref version) = self.cache.crate_version {
523 "<p class=\"location\">Crate {}</p>\
524 <div class=\"block version\">\
527 <a id=\"all-types\" href=\"index.html\"><p>Back to index</p></a>",
534 let all = self.shared.all.replace(AllTypes::new());
535 let v = layout::render(
539 |buf: &mut Buffer| all.print(buf),
540 &self.shared.style_files,
542 self.shared.fs.write(final_file, v.as_bytes())?;
544 // Generating settings page.
545 page.title = "Rustdoc settings";
546 page.description = "Settings of Rustdoc";
547 page.root_path = "./";
549 let mut style_files = self.shared.style_files.clone();
550 let sidebar = "<p class=\"location\">Settings</p><div class=\"sidebar-elems\"></div>";
551 style_files.push(StylePath { path: PathBuf::from("settings.css"), disabled: false });
552 let v = layout::render(
557 self.shared.static_root_path.as_deref().unwrap_or("./"),
558 &self.shared.resource_suffix,
559 &self.shared.style_files,
563 self.shared.fs.write(&settings_file, v.as_bytes())?;
564 if let Some(ref redirections) = self.shared.redirections {
565 if !redirections.borrow().is_empty() {
566 let redirect_map_path =
567 self.dst.join(&*crate_name.as_str()).join("redirect-map.json");
568 let paths = serde_json::to_string(&*redirections.borrow()).unwrap();
569 self.shared.ensure_dir(&self.dst.join(&*crate_name.as_str()))?;
570 self.shared.fs.write(&redirect_map_path, paths.as_bytes())?;
574 // Flush pending errors.
575 Rc::get_mut(&mut self.shared).unwrap().fs.close();
576 let nb_errors = self.shared.errors.iter().map(|err| diag.struct_err(&err).emit()).count();
578 Err(Error::new(io::Error::new(io::ErrorKind::Other, "I/O error"), ""))
584 fn mod_item_in(&mut self, item: &clean::Item, item_name: &str) -> Result<(), Error> {
585 // Stripped modules survive the rustdoc passes (i.e., `strip-private`)
586 // if they contain impls for public types. These modules can also
587 // contain items such as publicly re-exported structures.
589 // External crates will provide links to these structures, so
590 // these modules are recursed into, but not rendered normally
591 // (a flag on the context).
592 if !self.render_redirect_pages {
593 self.render_redirect_pages = item.is_stripped();
595 let scx = &self.shared;
596 self.dst.push(item_name);
597 self.current.push(item_name.to_owned());
599 info!("Recursing into {}", self.dst.display());
601 let buf = self.render_item(item, false);
602 // buf will be empty if the module is stripped and there is no redirect for it
604 self.shared.ensure_dir(&self.dst)?;
605 let joint_dst = self.dst.join("index.html");
606 scx.fs.write(&joint_dst, buf.as_bytes())?;
609 // Render sidebar-items.js used throughout this module.
610 if !self.render_redirect_pages {
611 let module = match *item.kind {
612 clean::StrippedItem(box clean::ModuleItem(ref m)) | clean::ModuleItem(ref m) => m,
615 let items = self.build_sidebar_items(module);
616 let js_dst = self.dst.join("sidebar-items.js");
617 let v = format!("initSidebarItems({});", serde_json::to_string(&items).unwrap());
618 scx.fs.write(&js_dst, &v)?;
623 fn mod_item_out(&mut self, _item_name: &str) -> Result<(), Error> {
624 info!("Recursed; leaving {}", self.dst.display());
626 // Go back to where we were at
632 fn item(&mut self, item: clean::Item) -> Result<(), Error> {
633 // Stripped modules survive the rustdoc passes (i.e., `strip-private`)
634 // if they contain impls for public types. These modules can also
635 // contain items such as publicly re-exported structures.
637 // External crates will provide links to these structures, so
638 // these modules are recursed into, but not rendered normally
639 // (a flag on the context).
640 if !self.render_redirect_pages {
641 self.render_redirect_pages = item.is_stripped();
644 let buf = self.render_item(&item, true);
645 // buf will be empty if the item is stripped and there is no redirect for it
647 let name = item.name.as_ref().unwrap();
648 let item_type = item.type_();
649 let file_name = &item_path(item_type, &name.as_str());
650 self.shared.ensure_dir(&self.dst)?;
651 let joint_dst = self.dst.join(file_name);
652 self.shared.fs.write(&joint_dst, buf.as_bytes())?;
654 if !self.render_redirect_pages {
655 self.shared.all.borrow_mut().append(full_path(self, &item), &item_type);
657 // If the item is a macro, redirect from the old macro URL (with !)
658 // to the new one (without).
659 if item_type == ItemType::Macro {
660 let redir_name = format!("{}.{}!.html", item_type, name);
661 if let Some(ref redirections) = self.shared.redirections {
662 let crate_name = &self.shared.layout.krate;
663 redirections.borrow_mut().insert(
664 format!("{}/{}", crate_name, redir_name),
665 format!("{}/{}", crate_name, file_name),
668 let v = layout::redirect(file_name);
669 let redir_dst = self.dst.join(redir_name);
670 self.shared.fs.write(&redir_dst, v.as_bytes())?;
677 fn cache(&self) -> &Cache {
682 fn make_item_keywords(it: &clean::Item) -> String {
683 format!("{}, {}", BASIC_KEYWORDS, it.name.as_ref().unwrap())