1 // Copyright 2013-2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Rustdoc's HTML Rendering module
13 //! This modules contains the bulk of the logic necessary for rendering a
14 //! rustdoc `clean::Crate` instance to a set of static HTML pages. This
15 //! rendering process is largely driven by the `format!` syntax extension to
16 //! perform all I/O into files and streams.
18 //! The rendering process is largely driven by the `Context` and `Cache`
19 //! structures. The cache is pre-populated by crawling the crate in question,
20 //! and then it is shared among the various rendering threads. The cache is meant
21 //! to be a fairly large structure not implementing `Clone` (because it's shared
22 //! among threads). The context, however, should be a lightweight structure. This
23 //! is cloned per-thread and contains information about what is currently being
26 //! In order to speed up rendering (mostly because of markdown rendering), the
27 //! rendering process has been parallelized. This parallelization is only
28 //! exposed through the `crate` method on the context, and then also from the
29 //! fact that the shared cache is stored in TLS (and must be accessed as such).
31 //! In addition to rendering the crate itself, this module is also responsible
32 //! for creating the corresponding search index and source file renderings.
33 //! These threads are not parallelized (they haven't been a bottleneck yet), and
34 //! both occur before the crate is rendered.
35 pub use self::ExternalLocation::*;
37 use std::ascii::AsciiExt;
38 use std::cell::RefCell;
39 use std::cmp::Ordering;
40 use std::collections::BTreeMap;
41 use std::default::Default;
43 use std::fmt::{self, Display, Formatter, Write as FmtWrite};
44 use std::fs::{self, File, OpenOptions};
45 use std::io::prelude::*;
46 use std::io::{self, BufWriter, BufReader};
47 use std::iter::repeat;
49 use std::path::{PathBuf, Path, Component};
53 use externalfiles::ExternalHtml;
55 use serialize::json::{ToJson, Json, as_json};
56 use syntax::{abi, ast};
57 use syntax::feature_gate::UnstableFeatures;
58 use rustc::hir::def_id::{CrateNum, CRATE_DEF_INDEX, DefId};
59 use rustc::middle::privacy::AccessLevels;
60 use rustc::middle::stability;
62 use rustc::util::nodemap::{FxHashMap, FxHashSet};
63 use rustc::session::config::nightly_options::is_nightly_build;
64 use rustc_data_structures::flock;
66 use clean::{self, AttributesExt, GetDefId, SelfTy, Mutability};
69 use html::escape::Escape;
70 use html::format::{ConstnessSpace};
71 use html::format::{TyParamBounds, WhereClause, href, AbiSpace};
72 use html::format::{VisSpace, Method, UnsafetySpace, MutableSpace};
73 use html::format::fmt_impl_for_trait_page;
74 use html::item_type::ItemType;
75 use html::markdown::{self, Markdown, MarkdownHtml, MarkdownSummaryLine, RenderType};
76 use html::{highlight, layout};
81 /// A pair of name and its optional document.
82 pub type NameDoc = (String, Option<String>);
84 /// Major driving force in all rustdoc rendering. This contains information
85 /// about where in the tree-like hierarchy rendering is occurring and controls
86 /// how the current page is being rendered.
88 /// It is intended that this context is a lightweight object which can be fairly
89 /// easily cloned because it is cloned per work-job (about once per item in the
93 /// Current hierarchy of components leading down to what's currently being
95 pub current: Vec<String>,
96 /// The current destination folder of where HTML artifacts should be placed.
97 /// This changes as the context descends into the module hierarchy.
99 /// A flag, which when `true`, will render pages which redirect to the
100 /// real location of an item. This is used to allow external links to
101 /// publicly reused items to redirect to the right location.
102 pub render_redirect_pages: bool,
103 pub shared: Arc<SharedContext>,
104 pub render_type: RenderType,
107 pub struct SharedContext {
108 /// The path to the crate root source minus the file name.
109 /// Used for simplifying paths to the highlighted source code files.
110 pub src_root: PathBuf,
111 /// This describes the layout of each page, and is not modified after
112 /// creation of the context (contains info like the favicon and added html).
113 pub layout: layout::Layout,
114 /// This flag indicates whether [src] links should be generated or not. If
115 /// the source files are present in the html rendering, then this will be
117 pub include_sources: bool,
118 /// The local file sources we've emitted and their respective url-paths.
119 pub local_sources: FxHashMap<PathBuf, String>,
120 /// All the passes that were run on this crate.
121 pub passes: FxHashSet<String>,
122 /// The base-URL of the issue tracker for when an item has been tagged with
124 pub issue_tracker_base_url: Option<String>,
125 /// The given user css file which allow to customize the generated
126 /// documentation theme.
127 pub css_file_extension: Option<PathBuf>,
130 /// Indicates where an external crate can be found.
131 pub enum ExternalLocation {
132 /// Remote URL root of the external crate
134 /// This external crate can be found in the local doc/ folder
136 /// The external crate could not be found.
140 /// Metadata about an implementor of a trait.
141 pub struct Implementor {
143 pub stability: Option<clean::Stability>,
144 pub impl_: clean::Impl,
147 /// Metadata about implementations for a type.
150 pub impl_item: clean::Item,
154 fn inner_impl(&self) -> &clean::Impl {
155 match self.impl_item.inner {
156 clean::ImplItem(ref impl_) => impl_,
157 _ => panic!("non-impl item found in impl")
161 fn trait_did(&self) -> Option<DefId> {
162 self.inner_impl().trait_.def_id()
172 impl error::Error for Error {
173 fn description(&self) -> &str {
174 self.error.description()
178 impl Display for Error {
179 fn fmt(&self, f: &mut Formatter) -> fmt::Result {
180 write!(f, "\"{}\": {}", self.file.display(), self.error)
185 pub fn new(e: io::Error, file: &Path) -> Error {
187 file: file.to_path_buf(),
193 macro_rules! try_err {
194 ($e:expr, $file:expr) => ({
197 Err(e) => return Err(Error::new(e, $file)),
202 /// This cache is used to store information about the `clean::Crate` being
203 /// rendered in order to provide more useful documentation. This contains
204 /// information like all implementors of a trait, all traits a type implements,
205 /// documentation for all known traits, etc.
207 /// This structure purposefully does not implement `Clone` because it's intended
208 /// to be a fairly large and expensive structure to clone. Instead this adheres
209 /// to `Send` so it may be stored in a `Arc` instance and shared among the various
210 /// rendering threads.
213 /// Mapping of typaram ids to the name of the type parameter. This is used
214 /// when pretty-printing a type (so pretty printing doesn't have to
215 /// painfully maintain a context like this)
216 pub typarams: FxHashMap<DefId, String>,
218 /// Maps a type id to all known implementations for that type. This is only
219 /// recognized for intra-crate `ResolvedPath` types, and is used to print
220 /// out extra documentation on the page of an enum/struct.
222 /// The values of the map are a list of implementations and documentation
223 /// found on that implementation.
224 pub impls: FxHashMap<DefId, Vec<Impl>>,
226 /// Maintains a mapping of local crate node ids to the fully qualified name
227 /// and "short type description" of that node. This is used when generating
228 /// URLs when a type is being linked to. External paths are not located in
229 /// this map because the `External` type itself has all the information
231 pub paths: FxHashMap<DefId, (Vec<String>, ItemType)>,
233 /// Similar to `paths`, but only holds external paths. This is only used for
234 /// generating explicit hyperlinks to other crates.
235 pub external_paths: FxHashMap<DefId, (Vec<String>, ItemType)>,
237 /// This map contains information about all known traits of this crate.
238 /// Implementations of a crate should inherit the documentation of the
239 /// parent trait if no extra documentation is specified, and default methods
240 /// should show up in documentation about trait implementations.
241 pub traits: FxHashMap<DefId, clean::Trait>,
243 /// When rendering traits, it's often useful to be able to list all
244 /// implementors of the trait, and this mapping is exactly, that: a mapping
245 /// of trait ids to the list of known implementors of the trait
246 pub implementors: FxHashMap<DefId, Vec<Implementor>>,
248 /// Cache of where external crate documentation can be found.
249 pub extern_locations: FxHashMap<CrateNum, (String, PathBuf, ExternalLocation)>,
251 /// Cache of where documentation for primitives can be found.
252 pub primitive_locations: FxHashMap<clean::PrimitiveType, DefId>,
254 // Note that external items for which `doc(hidden)` applies to are shown as
255 // non-reachable while local items aren't. This is because we're reusing
256 // the access levels from crateanalysis.
257 pub access_levels: Arc<AccessLevels<DefId>>,
259 // Private fields only used when initially crawling a crate to build a cache
262 parent_stack: Vec<DefId>,
263 parent_is_trait_impl: bool,
264 search_index: Vec<IndexItem>,
266 deref_trait_did: Option<DefId>,
267 deref_mut_trait_did: Option<DefId>,
268 owned_box_did: Option<DefId>,
270 // In rare case where a structure is defined in one module but implemented
271 // in another, if the implementing module is parsed before defining module,
272 // then the fully qualified name of the structure isn't presented in `paths`
273 // yet when its implementation methods are being indexed. Caches such methods
274 // and their parent id here and indexes them at the end of crate parsing.
275 orphan_impl_items: Vec<(DefId, clean::Item)>,
278 /// Temporary storage for data obtained during `RustdocVisitor::clean()`.
279 /// Later on moved into `CACHE_KEY`.
281 pub struct RenderInfo {
282 pub inlined: FxHashSet<DefId>,
283 pub external_paths: ::core::ExternalPaths,
284 pub external_typarams: FxHashMap<DefId, String>,
285 pub deref_trait_did: Option<DefId>,
286 pub deref_mut_trait_did: Option<DefId>,
287 pub owned_box_did: Option<DefId>,
290 /// Helper struct to render all source code to HTML pages
291 struct SourceCollector<'a> {
292 scx: &'a mut SharedContext,
294 /// Root destination to place all HTML output into
298 /// Wrapper struct to render the source code of a file. This will do things like
299 /// adding line numbers to the left-hand side.
300 struct Source<'a>(&'a str);
302 // Helper structs for rendering items/sidebars and carrying along contextual
305 #[derive(Copy, Clone)]
308 item: &'a clean::Item,
311 struct Sidebar<'a> { cx: &'a Context, item: &'a clean::Item, }
313 /// Struct representing one entry in the JS search index. These are all emitted
314 /// by hand to a large JS file at the end of cache-creation.
320 parent: Option<DefId>,
321 parent_idx: Option<usize>,
322 search_type: Option<IndexItemFunctionType>,
325 impl ToJson for IndexItem {
326 fn to_json(&self) -> Json {
327 assert_eq!(self.parent.is_some(), self.parent_idx.is_some());
329 let mut data = Vec::with_capacity(6);
330 data.push((self.ty as usize).to_json());
331 data.push(self.name.to_json());
332 data.push(self.path.to_json());
333 data.push(self.desc.to_json());
334 data.push(self.parent_idx.to_json());
335 data.push(self.search_type.to_json());
341 /// A type used for the search index.
343 name: Option<String>,
346 impl ToJson for Type {
347 fn to_json(&self) -> Json {
350 let mut data = BTreeMap::new();
351 data.insert("name".to_owned(), name.to_json());
359 /// Full type of functions/methods in the search index.
360 struct IndexItemFunctionType {
365 impl ToJson for IndexItemFunctionType {
366 fn to_json(&self) -> Json {
367 // If we couldn't figure out a type, just write `null`.
368 if self.inputs.iter().chain(self.output.iter()).any(|ref i| i.name.is_none()) {
371 let mut data = BTreeMap::new();
372 data.insert("inputs".to_owned(), self.inputs.to_json());
373 data.insert("output".to_owned(), self.output.to_json());
379 // TLS keys used to carry information around during rendering.
381 thread_local!(static CACHE_KEY: RefCell<Arc<Cache>> = Default::default());
382 thread_local!(pub static CURRENT_LOCATION_KEY: RefCell<Vec<String>> =
383 RefCell::new(Vec::new()));
384 thread_local!(static USED_ID_MAP: RefCell<FxHashMap<String, usize>> =
385 RefCell::new(init_ids()));
387 fn init_ids() -> FxHashMap<String, usize> {
403 ].into_iter().map(|id| (String::from(*id), 1)).collect()
406 /// This method resets the local table of used ID attributes. This is typically
407 /// used at the beginning of rendering an entire HTML page to reset from the
408 /// previous state (if any).
409 pub fn reset_ids(embedded: bool) {
410 USED_ID_MAP.with(|s| {
411 *s.borrow_mut() = if embedded {
419 pub fn derive_id(candidate: String) -> String {
420 USED_ID_MAP.with(|map| {
421 let id = match map.borrow_mut().get_mut(&candidate) {
424 let id = format!("{}-{}", candidate, *a);
430 map.borrow_mut().insert(id.clone(), 1);
435 /// Generates the documentation for `crate` into the directory `dst`
436 pub fn run(mut krate: clean::Crate,
437 external_html: &ExternalHtml,
438 playground_url: Option<String>,
440 passes: FxHashSet<String>,
441 css_file_extension: Option<PathBuf>,
442 renderinfo: RenderInfo,
443 render_type: RenderType) -> Result<(), Error> {
444 let src_root = match krate.src.parent() {
445 Some(p) => p.to_path_buf(),
446 None => PathBuf::new(),
448 let mut scx = SharedContext {
451 include_sources: true,
452 local_sources: FxHashMap(),
453 issue_tracker_base_url: None,
454 layout: layout::Layout {
455 logo: "".to_string(),
456 favicon: "".to_string(),
457 external_html: external_html.clone(),
458 krate: krate.name.clone(),
460 css_file_extension: css_file_extension.clone(),
463 // If user passed in `--playground-url` arg, we fill in crate name here
464 if let Some(url) = playground_url {
465 markdown::PLAYGROUND.with(|slot| {
466 *slot.borrow_mut() = Some((Some(krate.name.clone()), url));
470 // Crawl the crate attributes looking for attributes which control how we're
471 // going to emit HTML
472 if let Some(attrs) = krate.module.as_ref().map(|m| &m.attrs) {
473 for attr in attrs.lists("doc") {
474 let name = attr.name().map(|s| s.as_str());
475 match (name.as_ref().map(|s| &s[..]), attr.value_str()) {
476 (Some("html_favicon_url"), Some(s)) => {
477 scx.layout.favicon = s.to_string();
479 (Some("html_logo_url"), Some(s)) => {
480 scx.layout.logo = s.to_string();
482 (Some("html_playground_url"), Some(s)) => {
483 markdown::PLAYGROUND.with(|slot| {
484 let name = krate.name.clone();
485 *slot.borrow_mut() = Some((Some(name), s.to_string()));
488 (Some("issue_tracker_base_url"), Some(s)) => {
489 scx.issue_tracker_base_url = Some(s.to_string());
491 (Some("html_no_source"), None) if attr.is_word() => {
492 scx.include_sources = false;
498 try_err!(fs::create_dir_all(&dst), &dst);
499 krate = render_sources(&dst, &mut scx, krate)?;
503 render_redirect_pages: false,
504 shared: Arc::new(scx),
508 // Crawl the crate to build various caches used for the output
518 let external_paths = external_paths.into_iter()
519 .map(|(k, (v, t))| (k, (v, ItemType::from(t))))
522 let mut cache = Cache {
526 implementors: FxHashMap(),
528 parent_stack: Vec::new(),
529 search_index: Vec::new(),
530 parent_is_trait_impl: false,
531 extern_locations: FxHashMap(),
532 primitive_locations: FxHashMap(),
534 access_levels: krate.access_levels.clone(),
535 orphan_impl_items: Vec::new(),
536 traits: mem::replace(&mut krate.external_traits, FxHashMap()),
540 typarams: external_typarams,
543 // Cache where all our extern crates are located
544 for &(n, ref e) in &krate.externs {
545 let src_root = match Path::new(&e.src).parent() {
546 Some(p) => p.to_path_buf(),
547 None => PathBuf::new(),
549 cache.extern_locations.insert(n, (e.name.clone(), src_root,
550 extern_location(e, &cx.dst)));
552 let did = DefId { krate: n, index: CRATE_DEF_INDEX };
553 cache.external_paths.insert(did, (vec![e.name.to_string()], ItemType::Module));
556 // Cache where all known primitives have their documentation located.
558 // Favor linking to as local extern as possible, so iterate all crates in
559 // reverse topological order.
560 for &(_, ref e) in krate.externs.iter().rev() {
561 for &(def_id, prim, _) in &e.primitives {
562 cache.primitive_locations.insert(prim, def_id);
565 for &(def_id, prim, _) in &krate.primitives {
566 cache.primitive_locations.insert(prim, def_id);
569 cache.stack.push(krate.name.clone());
570 krate = cache.fold_crate(krate);
572 // Build our search index
573 let index = build_index(&krate, &mut cache);
575 // Freeze the cache now that the index has been built. Put an Arc into TLS
576 // for future parallelization opportunities
577 let cache = Arc::new(cache);
578 CACHE_KEY.with(|v| *v.borrow_mut() = cache.clone());
579 CURRENT_LOCATION_KEY.with(|s| s.borrow_mut().clear());
581 write_shared(&cx, &krate, &*cache, index)?;
583 // And finally render the whole crate's documentation
587 /// Build the search index from the collected metadata
588 fn build_index(krate: &clean::Crate, cache: &mut Cache) -> String {
589 let mut nodeid_to_pathid = FxHashMap();
590 let mut crate_items = Vec::with_capacity(cache.search_index.len());
591 let mut crate_paths = Vec::<Json>::new();
593 let Cache { ref mut search_index,
594 ref orphan_impl_items,
595 ref mut paths, .. } = *cache;
597 // Attach all orphan items to the type's definition if the type
598 // has since been learned.
599 for &(did, ref item) in orphan_impl_items {
600 if let Some(&(ref fqp, _)) = paths.get(&did) {
601 search_index.push(IndexItem {
603 name: item.name.clone().unwrap(),
604 path: fqp[..fqp.len() - 1].join("::"),
605 desc: plain_summary_line(item.doc_value()),
608 search_type: get_index_search_type(&item),
613 // Reduce `NodeId` in paths into smaller sequential numbers,
614 // and prune the paths that do not appear in the index.
615 let mut lastpath = String::new();
616 let mut lastpathid = 0usize;
618 for item in search_index {
619 item.parent_idx = item.parent.map(|nodeid| {
620 if nodeid_to_pathid.contains_key(&nodeid) {
621 *nodeid_to_pathid.get(&nodeid).unwrap()
623 let pathid = lastpathid;
624 nodeid_to_pathid.insert(nodeid, pathid);
627 let &(ref fqp, short) = paths.get(&nodeid).unwrap();
628 crate_paths.push(((short as usize), fqp.last().unwrap().clone()).to_json());
633 // Omit the parent path if it is same to that of the prior item.
634 if lastpath == item.path {
637 lastpath = item.path.clone();
639 crate_items.push(item.to_json());
642 let crate_doc = krate.module.as_ref().map(|module| {
643 plain_summary_line(module.doc_value())
644 }).unwrap_or(String::new());
646 let mut crate_data = BTreeMap::new();
647 crate_data.insert("doc".to_owned(), Json::String(crate_doc));
648 crate_data.insert("items".to_owned(), Json::Array(crate_items));
649 crate_data.insert("paths".to_owned(), Json::Array(crate_paths));
651 // Collect the index into a string
652 format!("searchIndex[{}] = {};",
653 as_json(&krate.name),
654 Json::Object(crate_data))
657 fn write_shared(cx: &Context,
658 krate: &clean::Crate,
660 search_index: String) -> Result<(), Error> {
661 // Write out the shared files. Note that these are shared among all rustdoc
662 // docs placed in the output directory, so this needs to be a synchronized
663 // operation with respect to all other rustdocs running around.
664 try_err!(fs::create_dir_all(&cx.dst), &cx.dst);
665 let _lock = flock::Lock::panicking_new(&cx.dst.join(".lock"), true, true, true);
667 // Add all the static files. These may already exist, but we just
668 // overwrite them anyway to make sure that they're fresh and up-to-date.
670 write(cx.dst.join("main.js"),
671 include_bytes!("static/main.js"))?;
672 write(cx.dst.join("rustdoc.css"),
673 include_bytes!("static/rustdoc.css"))?;
674 write(cx.dst.join("main.css"),
675 include_bytes!("static/styles/main.css"))?;
676 if let Some(ref css) = cx.shared.css_file_extension {
677 let mut content = String::new();
678 let css = css.as_path();
679 let mut f = try_err!(File::open(css), css);
681 try_err!(f.read_to_string(&mut content), css);
682 let css = cx.dst.join("theme.css");
683 let css = css.as_path();
684 let mut f = try_err!(File::create(css), css);
685 try_err!(write!(f, "{}", &content), css);
687 write(cx.dst.join("normalize.css"),
688 include_bytes!("static/normalize.css"))?;
689 write(cx.dst.join("FiraSans-Regular.woff"),
690 include_bytes!("static/FiraSans-Regular.woff"))?;
691 write(cx.dst.join("FiraSans-Medium.woff"),
692 include_bytes!("static/FiraSans-Medium.woff"))?;
693 write(cx.dst.join("FiraSans-LICENSE.txt"),
694 include_bytes!("static/FiraSans-LICENSE.txt"))?;
695 write(cx.dst.join("Heuristica-Italic.woff"),
696 include_bytes!("static/Heuristica-Italic.woff"))?;
697 write(cx.dst.join("Heuristica-LICENSE.txt"),
698 include_bytes!("static/Heuristica-LICENSE.txt"))?;
699 write(cx.dst.join("SourceSerifPro-Regular.woff"),
700 include_bytes!("static/SourceSerifPro-Regular.woff"))?;
701 write(cx.dst.join("SourceSerifPro-Bold.woff"),
702 include_bytes!("static/SourceSerifPro-Bold.woff"))?;
703 write(cx.dst.join("SourceSerifPro-LICENSE.txt"),
704 include_bytes!("static/SourceSerifPro-LICENSE.txt"))?;
705 write(cx.dst.join("SourceCodePro-Regular.woff"),
706 include_bytes!("static/SourceCodePro-Regular.woff"))?;
707 write(cx.dst.join("SourceCodePro-Semibold.woff"),
708 include_bytes!("static/SourceCodePro-Semibold.woff"))?;
709 write(cx.dst.join("SourceCodePro-LICENSE.txt"),
710 include_bytes!("static/SourceCodePro-LICENSE.txt"))?;
711 write(cx.dst.join("LICENSE-MIT.txt"),
712 include_bytes!("static/LICENSE-MIT.txt"))?;
713 write(cx.dst.join("LICENSE-APACHE.txt"),
714 include_bytes!("static/LICENSE-APACHE.txt"))?;
715 write(cx.dst.join("COPYRIGHT.txt"),
716 include_bytes!("static/COPYRIGHT.txt"))?;
718 fn collect(path: &Path, krate: &str,
719 key: &str) -> io::Result<Vec<String>> {
720 let mut ret = Vec::new();
722 for line in BufReader::new(File::open(path)?).lines() {
724 if !line.starts_with(key) {
727 if line.starts_with(&format!(r#"{}["{}"]"#, key, krate)) {
730 ret.push(line.to_string());
736 // Update the search index
737 let dst = cx.dst.join("search-index.js");
738 let mut all_indexes = try_err!(collect(&dst, &krate.name, "searchIndex"), &dst);
739 all_indexes.push(search_index);
740 // Sort the indexes by crate so the file will be generated identically even
741 // with rustdoc running in parallel.
743 let mut w = try_err!(File::create(&dst), &dst);
744 try_err!(writeln!(&mut w, "var searchIndex = {{}};"), &dst);
745 for index in &all_indexes {
746 try_err!(writeln!(&mut w, "{}", *index), &dst);
748 try_err!(writeln!(&mut w, "initSearch(searchIndex);"), &dst);
750 // Update the list of all implementors for traits
751 let dst = cx.dst.join("implementors");
752 for (&did, imps) in &cache.implementors {
753 // Private modules can leak through to this phase of rustdoc, which
754 // could contain implementations for otherwise private types. In some
755 // rare cases we could find an implementation for an item which wasn't
756 // indexed, so we just skip this step in that case.
758 // FIXME: this is a vague explanation for why this can't be a `get`, in
759 // theory it should be...
760 let &(ref remote_path, remote_item_type) = match cache.paths.get(&did) {
762 None => match cache.external_paths.get(&did) {
768 let mut have_impls = false;
769 let mut implementors = format!(r#"implementors["{}"] = ["#, krate.name);
771 // If the trait and implementation are in the same crate, then
772 // there's no need to emit information about it (there's inlining
773 // going on). If they're in different crates then the crate defining
774 // the trait will be interested in our implementation.
775 if imp.def_id.krate == did.krate { continue }
776 // If the implementation is from another crate then that crate
778 if !imp.def_id.is_local() { continue }
780 write!(implementors, "{},", as_json(&imp.impl_.to_string())).unwrap();
782 implementors.push_str("];");
784 // Only create a js file if we have impls to add to it. If the trait is
785 // documented locally though we always create the file to avoid dead
787 if !have_impls && !cache.paths.contains_key(&did) {
791 let mut mydst = dst.clone();
792 for part in &remote_path[..remote_path.len() - 1] {
795 try_err!(fs::create_dir_all(&mydst), &mydst);
796 mydst.push(&format!("{}.{}.js",
797 remote_item_type.css_class(),
798 remote_path[remote_path.len() - 1]));
800 let mut all_implementors = try_err!(collect(&mydst, &krate.name, "implementors"), &mydst);
801 all_implementors.push(implementors);
802 // Sort the implementors by crate so the file will be generated
803 // identically even with rustdoc running in parallel.
804 all_implementors.sort();
806 let mut f = try_err!(File::create(&mydst), &mydst);
807 try_err!(writeln!(&mut f, "(function() {{var implementors = {{}};"), &mydst);
808 for implementor in &all_implementors {
809 try_err!(writeln!(&mut f, "{}", *implementor), &mydst);
811 try_err!(writeln!(&mut f, "{}", r"
812 if (window.register_implementors) {
813 window.register_implementors(implementors);
815 window.pending_implementors = implementors;
818 try_err!(writeln!(&mut f, r"}})()"), &mydst);
823 fn render_sources(dst: &Path, scx: &mut SharedContext,
824 krate: clean::Crate) -> Result<clean::Crate, Error> {
825 info!("emitting source files");
826 let dst = dst.join("src").join(&krate.name);
827 try_err!(fs::create_dir_all(&dst), &dst);
828 let mut folder = SourceCollector {
832 Ok(folder.fold_crate(krate))
835 /// Writes the entire contents of a string to a destination, not attempting to
836 /// catch any errors.
837 fn write(dst: PathBuf, contents: &[u8]) -> Result<(), Error> {
838 Ok(try_err!(try_err!(File::create(&dst), &dst).write_all(contents), &dst))
841 /// Takes a path to a source file and cleans the path to it. This canonicalizes
842 /// things like ".." to components which preserve the "top down" hierarchy of a
843 /// static HTML tree. Each component in the cleaned path will be passed as an
844 /// argument to `f`. The very last component of the path (ie the file name) will
845 /// be passed to `f` if `keep_filename` is true, and ignored otherwise.
846 // FIXME (#9639): The closure should deal with &[u8] instead of &str
847 // FIXME (#9639): This is too conservative, rejecting non-UTF-8 paths
848 fn clean_srcpath<F>(src_root: &Path, p: &Path, keep_filename: bool, mut f: F) where
851 // make it relative, if possible
852 let p = p.strip_prefix(src_root).unwrap_or(p);
854 let mut iter = p.components().peekable();
856 while let Some(c) = iter.next() {
857 if !keep_filename && iter.peek().is_none() {
862 Component::ParentDir => f("up"),
863 Component::Normal(c) => f(c.to_str().unwrap()),
869 /// Attempts to find where an external crate is located, given that we're
870 /// rendering in to the specified source destination.
871 fn extern_location(e: &clean::ExternalCrate, dst: &Path) -> ExternalLocation {
872 // See if there's documentation generated into the local directory
873 let local_location = dst.join(&e.name);
874 if local_location.is_dir() {
878 // Failing that, see if there's an attribute specifying where to find this
881 .filter(|a| a.check_name("html_root_url"))
882 .filter_map(|a| a.value_str())
884 let mut url = url.to_string();
885 if !url.ends_with("/") {
889 }).next().unwrap_or(Unknown) // Well, at least we tried.
892 impl<'a> DocFolder for SourceCollector<'a> {
893 fn fold_item(&mut self, item: clean::Item) -> Option<clean::Item> {
894 // If we're including source files, and we haven't seen this file yet,
895 // then we need to render it out to the filesystem.
896 if self.scx.include_sources
897 // skip all invalid spans
898 && item.source.filename != ""
899 // skip non-local items
900 && item.def_id.is_local()
901 // Macros from other libraries get special filenames which we can
903 && !(item.source.filename.starts_with("<")
904 && item.source.filename.ends_with("macros>")) {
906 // If it turns out that we couldn't read this file, then we probably
907 // can't read any of the files (generating html output from json or
908 // something like that), so just don't include sources for the
909 // entire crate. The other option is maintaining this mapping on a
910 // per-file basis, but that's probably not worth it...
912 .include_sources = match self.emit_source(&item.source.filename) {
915 println!("warning: source code was requested to be rendered, \
916 but processing `{}` had an error: {}",
917 item.source.filename, e);
918 println!(" skipping rendering of source code");
923 self.fold_item_recur(item)
927 impl<'a> SourceCollector<'a> {
928 /// Renders the given filename into its corresponding HTML source file.
929 fn emit_source(&mut self, filename: &str) -> io::Result<()> {
930 let p = PathBuf::from(filename);
931 if self.scx.local_sources.contains_key(&p) {
932 // We've already emitted this source
936 let mut contents = Vec::new();
937 File::open(&p).and_then(|mut f| f.read_to_end(&mut contents))?;
939 let contents = str::from_utf8(&contents).unwrap();
941 // Remove the utf-8 BOM if any
942 let contents = if contents.starts_with("\u{feff}") {
948 // Create the intermediate directories
949 let mut cur = self.dst.clone();
950 let mut root_path = String::from("../../");
951 let mut href = String::new();
952 clean_srcpath(&self.scx.src_root, &p, false, |component| {
954 fs::create_dir_all(&cur).unwrap();
955 root_path.push_str("../");
956 href.push_str(component);
959 let mut fname = p.file_name().expect("source has no filename")
963 href.push_str(&fname.to_string_lossy());
965 let mut w = BufWriter::new(File::create(&cur)?);
966 let title = format!("{} -- source", cur.file_name().unwrap()
968 let desc = format!("Source to the Rust file `{}`.", filename);
969 let page = layout::Page {
972 root_path: &root_path,
974 keywords: BASIC_KEYWORDS,
976 layout::render(&mut w, &self.scx.layout,
977 &page, &(""), &Source(contents),
978 self.scx.css_file_extension.is_some())?;
980 self.scx.local_sources.insert(p, href);
985 impl DocFolder for Cache {
986 fn fold_item(&mut self, item: clean::Item) -> Option<clean::Item> {
987 // If this is a stripped module,
988 // we don't want it or its children in the search index.
989 let orig_stripped_mod = match item.inner {
990 clean::StrippedItem(box clean::ModuleItem(..)) => {
991 mem::replace(&mut self.stripped_mod, true)
993 _ => self.stripped_mod,
996 // Register any generics to their corresponding string. This is used
997 // when pretty-printing types.
998 if let Some(generics) = item.inner.generics() {
999 self.generics(generics);
1002 // Propagate a trait method's documentation to all implementors of the
1004 if let clean::TraitItem(ref t) = item.inner {
1005 self.traits.entry(item.def_id).or_insert_with(|| t.clone());
1008 // Collect all the implementors of traits.
1009 if let clean::ImplItem(ref i) = item.inner {
1010 if let Some(did) = i.trait_.def_id() {
1011 self.implementors.entry(did).or_insert(vec![]).push(Implementor {
1012 def_id: item.def_id,
1013 stability: item.stability.clone(),
1019 // Index this method for searching later on.
1020 if let Some(ref s) = item.name {
1021 let (parent, is_inherent_impl_item) = match item.inner {
1022 clean::StrippedItem(..) => ((None, None), false),
1023 clean::AssociatedConstItem(..) |
1024 clean::TypedefItem(_, true) if self.parent_is_trait_impl => {
1025 // skip associated items in trait impls
1026 ((None, None), false)
1028 clean::AssociatedTypeItem(..) |
1029 clean::TyMethodItem(..) |
1030 clean::StructFieldItem(..) |
1031 clean::VariantItem(..) => {
1032 ((Some(*self.parent_stack.last().unwrap()),
1033 Some(&self.stack[..self.stack.len() - 1])),
1036 clean::MethodItem(..) | clean::AssociatedConstItem(..) => {
1037 if self.parent_stack.is_empty() {
1038 ((None, None), false)
1040 let last = self.parent_stack.last().unwrap();
1042 let path = match self.paths.get(&did) {
1043 // The current stack not necessarily has correlation
1044 // for where the type was defined. On the other
1045 // hand, `paths` always has the right
1046 // information if present.
1047 Some(&(ref fqp, ItemType::Trait)) |
1048 Some(&(ref fqp, ItemType::Struct)) |
1049 Some(&(ref fqp, ItemType::Union)) |
1050 Some(&(ref fqp, ItemType::Enum)) =>
1051 Some(&fqp[..fqp.len() - 1]),
1052 Some(..) => Some(&*self.stack),
1055 ((Some(*last), path), true)
1058 _ => ((None, Some(&*self.stack)), false)
1062 (parent, Some(path)) if is_inherent_impl_item || (!self.stripped_mod) => {
1063 debug_assert!(!item.is_stripped());
1065 // A crate has a module at its root, containing all items,
1066 // which should not be indexed. The crate-item itself is
1067 // inserted later on when serializing the search-index.
1068 if item.def_id.index != CRATE_DEF_INDEX {
1069 self.search_index.push(IndexItem {
1071 name: s.to_string(),
1072 path: path.join("::").to_string(),
1073 desc: plain_summary_line(item.doc_value()),
1076 search_type: get_index_search_type(&item),
1080 (Some(parent), None) if is_inherent_impl_item => {
1081 // We have a parent, but we don't know where they're
1082 // defined yet. Wait for later to index this item.
1083 self.orphan_impl_items.push((parent, item.clone()));
1089 // Keep track of the fully qualified path for this item.
1090 let pushed = match item.name {
1091 Some(ref n) if !n.is_empty() => {
1092 self.stack.push(n.to_string());
1099 clean::StructItem(..) | clean::EnumItem(..) |
1100 clean::TypedefItem(..) | clean::TraitItem(..) |
1101 clean::FunctionItem(..) | clean::ModuleItem(..) |
1102 clean::ForeignFunctionItem(..) | clean::ForeignStaticItem(..) |
1103 clean::ConstantItem(..) | clean::StaticItem(..) |
1104 clean::UnionItem(..)
1105 if !self.stripped_mod => {
1106 // Reexported items mean that the same id can show up twice
1107 // in the rustdoc ast that we're looking at. We know,
1108 // however, that a reexported item doesn't show up in the
1109 // `public_items` map, so we can skip inserting into the
1110 // paths map if there was already an entry present and we're
1111 // not a public item.
1113 !self.paths.contains_key(&item.def_id) ||
1114 self.access_levels.is_public(item.def_id)
1116 self.paths.insert(item.def_id,
1117 (self.stack.clone(), item.type_()));
1120 // Link variants to their parent enum because pages aren't emitted
1121 // for each variant.
1122 clean::VariantItem(..) if !self.stripped_mod => {
1123 let mut stack = self.stack.clone();
1125 self.paths.insert(item.def_id, (stack, ItemType::Enum));
1128 clean::PrimitiveItem(..) if item.visibility.is_some() => {
1129 self.paths.insert(item.def_id, (self.stack.clone(),
1136 // Maintain the parent stack
1137 let orig_parent_is_trait_impl = self.parent_is_trait_impl;
1138 let parent_pushed = match item.inner {
1139 clean::TraitItem(..) | clean::EnumItem(..) |
1140 clean::StructItem(..) | clean::UnionItem(..) => {
1141 self.parent_stack.push(item.def_id);
1142 self.parent_is_trait_impl = false;
1145 clean::ImplItem(ref i) => {
1146 self.parent_is_trait_impl = i.trait_.is_some();
1148 clean::ResolvedPath{ did, .. } => {
1149 self.parent_stack.push(did);
1153 let prim_did = t.primitive_type().and_then(|t| {
1154 self.primitive_locations.get(&t).cloned()
1158 self.parent_stack.push(did);
1169 // Once we've recursively found all the generics, hoard off all the
1170 // implementations elsewhere.
1171 let ret = self.fold_item_recur(item).and_then(|item| {
1172 if let clean::Item { inner: clean::ImplItem(_), .. } = item {
1173 // Figure out the id of this impl. This may map to a
1174 // primitive rather than always to a struct/enum.
1175 // Note: matching twice to restrict the lifetime of the `i` borrow.
1176 let did = if let clean::Item { inner: clean::ImplItem(ref i), .. } = item {
1178 clean::ResolvedPath { did, .. } |
1179 clean::BorrowedRef {
1180 type_: box clean::ResolvedPath { did, .. }, ..
1185 t.primitive_type().and_then(|t| {
1186 self.primitive_locations.get(&t).cloned()
1193 if let Some(did) = did {
1194 self.impls.entry(did).or_insert(vec![]).push(Impl {
1204 if pushed { self.stack.pop().unwrap(); }
1205 if parent_pushed { self.parent_stack.pop().unwrap(); }
1206 self.stripped_mod = orig_stripped_mod;
1207 self.parent_is_trait_impl = orig_parent_is_trait_impl;
1213 fn generics(&mut self, generics: &clean::Generics) {
1214 for typ in &generics.type_params {
1215 self.typarams.insert(typ.did, typ.name.clone());
1221 /// String representation of how to get back to the root path of the 'doc/'
1222 /// folder in terms of a relative URL.
1223 fn root_path(&self) -> String {
1224 repeat("../").take(self.current.len()).collect::<String>()
1227 /// Recurse in the directory structure and change the "root path" to make
1228 /// sure it always points to the top (relatively).
1229 fn recurse<T, F>(&mut self, s: String, f: F) -> T where
1230 F: FnOnce(&mut Context) -> T,
1233 panic!("Unexpected empty destination: {:?}", self.current);
1235 let prev = self.dst.clone();
1237 self.current.push(s);
1239 info!("Recursing into {}", self.dst.display());
1243 info!("Recursed; leaving {}", self.dst.display());
1245 // Go back to where we were at
1247 self.current.pop().unwrap();
1252 /// Main method for rendering a crate.
1254 /// This currently isn't parallelized, but it'd be pretty easy to add
1255 /// parallelization to this function.
1256 fn krate(self, mut krate: clean::Crate) -> Result<(), Error> {
1257 let mut item = match krate.module.take() {
1259 None => return Ok(()),
1261 item.name = Some(krate.name);
1263 // Render the crate documentation
1264 let mut work = vec![(self, item)];
1266 while let Some((mut cx, item)) = work.pop() {
1267 cx.item(item, |cx, item| {
1268 work.push((cx.clone(), item))
1274 fn render_item(&self,
1275 writer: &mut io::Write,
1279 // A little unfortunate that this is done like this, but it sure
1280 // does make formatting *a lot* nicer.
1281 CURRENT_LOCATION_KEY.with(|slot| {
1282 *slot.borrow_mut() = self.current.clone();
1285 let mut title = if it.is_primitive() {
1286 // No need to include the namespace for primitive types
1289 self.current.join("::")
1292 if !title.is_empty() {
1293 title.push_str("::");
1295 title.push_str(it.name.as_ref().unwrap());
1297 title.push_str(" - Rust");
1298 let tyname = it.type_().css_class();
1299 let desc = if it.is_crate() {
1300 format!("API documentation for the Rust `{}` crate.",
1301 self.shared.layout.krate)
1303 format!("API documentation for the Rust `{}` {} in crate `{}`.",
1304 it.name.as_ref().unwrap(), tyname, self.shared.layout.krate)
1306 let keywords = make_item_keywords(it);
1307 let page = layout::Page {
1309 root_path: &self.root_path(),
1312 keywords: &keywords,
1317 if !self.render_redirect_pages {
1318 layout::render(writer, &self.shared.layout, &page,
1319 &Sidebar{ cx: self, item: it },
1320 &Item{ cx: self, item: it },
1321 self.shared.css_file_extension.is_some())?;
1323 let mut url = self.root_path();
1324 if let Some(&(ref names, ty)) = cache().paths.get(&it.def_id) {
1325 for name in &names[..names.len() - 1] {
1329 url.push_str(&item_path(ty, names.last().unwrap()));
1330 layout::redirect(writer, &url)?;
1336 /// Non-parallelized version of rendering an item. This will take the input
1337 /// item, render its contents, and then invoke the specified closure with
1338 /// all sub-items which need to be rendered.
1340 /// The rendering driver uses this closure to queue up more work.
1341 fn item<F>(&mut self, item: clean::Item, mut f: F) -> Result<(), Error> where
1342 F: FnMut(&mut Context, clean::Item),
1344 // Stripped modules survive the rustdoc passes (i.e. `strip-private`)
1345 // if they contain impls for public types. These modules can also
1346 // contain items such as publicly reexported structures.
1348 // External crates will provide links to these structures, so
1349 // these modules are recursed into, but not rendered normally
1350 // (a flag on the context).
1351 if !self.render_redirect_pages {
1352 self.render_redirect_pages = item.is_stripped();
1356 // modules are special because they add a namespace. We also need to
1357 // recurse into the items of the module as well.
1358 let name = item.name.as_ref().unwrap().to_string();
1359 let mut item = Some(item);
1360 self.recurse(name, |this| {
1361 let item = item.take().unwrap();
1363 let mut buf = Vec::new();
1364 this.render_item(&mut buf, &item, false).unwrap();
1365 // buf will be empty if the module is stripped and there is no redirect for it
1366 if !buf.is_empty() {
1367 let joint_dst = this.dst.join("index.html");
1368 try_err!(fs::create_dir_all(&this.dst), &this.dst);
1369 let mut dst = try_err!(File::create(&joint_dst), &joint_dst);
1370 try_err!(dst.write_all(&buf), &joint_dst);
1373 let m = match item.inner {
1374 clean::StrippedItem(box clean::ModuleItem(m)) |
1375 clean::ModuleItem(m) => m,
1379 // Render sidebar-items.js used throughout this module.
1380 if !this.render_redirect_pages {
1381 let items = this.build_sidebar_items(&m);
1382 let js_dst = this.dst.join("sidebar-items.js");
1383 let mut js_out = BufWriter::new(try_err!(File::create(&js_dst), &js_dst));
1384 try_err!(write!(&mut js_out, "initSidebarItems({});",
1385 as_json(&items)), &js_dst);
1388 for item in m.items {
1394 } else if item.name.is_some() {
1395 let mut buf = Vec::new();
1396 self.render_item(&mut buf, &item, true).unwrap();
1397 // buf will be empty if the item is stripped and there is no redirect for it
1398 if !buf.is_empty() {
1399 let name = item.name.as_ref().unwrap();
1400 let item_type = item.type_();
1401 let file_name = &item_path(item_type, name);
1402 let joint_dst = self.dst.join(file_name);
1403 try_err!(fs::create_dir_all(&self.dst), &self.dst);
1404 let mut dst = try_err!(File::create(&joint_dst), &joint_dst);
1405 try_err!(dst.write_all(&buf), &joint_dst);
1407 // Redirect from a sane URL using the namespace to Rustdoc's
1408 // URL for the page.
1409 let redir_name = format!("{}.{}.html", name, item_type.name_space());
1410 let redir_dst = self.dst.join(redir_name);
1411 if let Ok(mut redirect_out) = OpenOptions::new().create_new(true)
1414 try_err!(layout::redirect(&mut redirect_out, file_name), &redir_dst);
1417 // If the item is a macro, redirect from the old macro URL (with !)
1418 // to the new one (without).
1419 // FIXME(#35705) remove this redirect.
1420 if item_type == ItemType::Macro {
1421 let redir_name = format!("{}.{}!.html", item_type, name);
1422 let redir_dst = self.dst.join(redir_name);
1423 let mut redirect_out = try_err!(File::create(&redir_dst), &redir_dst);
1424 try_err!(layout::redirect(&mut redirect_out, file_name), &redir_dst);
1431 fn build_sidebar_items(&self, m: &clean::Module) -> BTreeMap<String, Vec<NameDoc>> {
1432 // BTreeMap instead of HashMap to get a sorted output
1433 let mut map = BTreeMap::new();
1434 for item in &m.items {
1435 if item.is_stripped() { continue }
1437 let short = item.type_().css_class();
1438 let myname = match item.name {
1440 Some(ref s) => s.to_string(),
1442 let short = short.to_string();
1443 map.entry(short).or_insert(vec![])
1444 .push((myname, Some(plain_summary_line(item.doc_value()))));
1447 for (_, items) in &mut map {
1455 /// Generate a url appropriate for an `href` attribute back to the source of
1458 /// The url generated, when clicked, will redirect the browser back to the
1459 /// original source code.
1461 /// If `None` is returned, then a source link couldn't be generated. This
1462 /// may happen, for example, with externally inlined items where the source
1463 /// of their crate documentation isn't known.
1464 fn src_href(&self) -> Option<String> {
1465 let mut root = self.cx.root_path();
1467 let cache = cache();
1468 let mut path = String::new();
1469 let (krate, path) = if self.item.def_id.is_local() {
1470 let path = PathBuf::from(&self.item.source.filename);
1471 if let Some(path) = self.cx.shared.local_sources.get(&path) {
1472 (&self.cx.shared.layout.krate, path)
1477 // Macros from other libraries get special filenames which we can
1479 if self.item.source.filename.starts_with("<") &&
1480 self.item.source.filename.ends_with("macros>") {
1484 let (krate, src_root) = match cache.extern_locations.get(&self.item.def_id.krate) {
1485 Some(&(ref name, ref src, Local)) => (name, src),
1486 Some(&(ref name, ref src, Remote(ref s))) => {
1487 root = s.to_string();
1490 Some(&(_, _, Unknown)) | None => return None,
1493 let file = Path::new(&self.item.source.filename);
1494 clean_srcpath(&src_root, file, false, |component| {
1495 path.push_str(component);
1498 let mut fname = file.file_name().expect("source has no filename")
1500 fname.push(".html");
1501 path.push_str(&fname.to_string_lossy());
1505 let lines = if self.item.source.loline == self.item.source.hiline {
1506 format!("{}", self.item.source.loline)
1508 format!("{}-{}", self.item.source.loline, self.item.source.hiline)
1510 Some(format!("{root}src/{krate}/{path}#{lines}",
1518 impl<'a> fmt::Display for Item<'a> {
1519 fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
1520 debug_assert!(!self.item.is_stripped());
1521 // Write the breadcrumb trail header for the top
1522 write!(fmt, "\n<h1 class='fqn'><span class='in-band'>")?;
1523 match self.item.inner {
1524 clean::ModuleItem(ref m) => if m.is_crate {
1525 write!(fmt, "Crate ")?;
1527 write!(fmt, "Module ")?;
1529 clean::FunctionItem(..) | clean::ForeignFunctionItem(..) =>
1530 write!(fmt, "Function ")?,
1531 clean::TraitItem(..) => write!(fmt, "Trait ")?,
1532 clean::StructItem(..) => write!(fmt, "Struct ")?,
1533 clean::UnionItem(..) => write!(fmt, "Union ")?,
1534 clean::EnumItem(..) => write!(fmt, "Enum ")?,
1535 clean::TypedefItem(..) => write!(fmt, "Type Definition ")?,
1536 clean::MacroItem(..) => write!(fmt, "Macro ")?,
1537 clean::PrimitiveItem(..) => write!(fmt, "Primitive Type ")?,
1538 clean::StaticItem(..) | clean::ForeignStaticItem(..) =>
1539 write!(fmt, "Static ")?,
1540 clean::ConstantItem(..) => write!(fmt, "Constant ")?,
1542 // We don't generate pages for any other type.
1546 if !self.item.is_primitive() {
1547 let cur = &self.cx.current;
1548 let amt = if self.item.is_mod() { cur.len() - 1 } else { cur.len() };
1549 for (i, component) in cur.iter().enumerate().take(amt) {
1550 write!(fmt, "<a href='{}index.html'>{}</a>::<wbr>",
1551 repeat("../").take(cur.len() - i - 1)
1552 .collect::<String>(),
1556 write!(fmt, "<a class=\"{}\" href=''>{}</a>",
1557 self.item.type_(), self.item.name.as_ref().unwrap())?;
1559 write!(fmt, "</span>")?; // in-band
1560 write!(fmt, "<span class='out-of-band'>")?;
1561 if let Some(version) = self.item.stable_since() {
1562 write!(fmt, "<span class='since' title='Stable since Rust version {0}'>{0}</span>",
1566 r##"<span id='render-detail'>
1567 <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
1568 [<span class='inner'>−</span>]
1574 // When this item is part of a `pub use` in a downstream crate, the
1575 // [src] link in the downstream documentation will actually come back to
1576 // this page, and this link will be auto-clicked. The `id` attribute is
1577 // used to find the link to auto-click.
1578 if self.cx.shared.include_sources && !self.item.is_primitive() {
1579 if let Some(l) = self.src_href() {
1580 write!(fmt, "<a class='srclink' href='{}' title='{}'>[src]</a>",
1581 l, "goto source code")?;
1585 write!(fmt, "</span>")?; // out-of-band
1587 write!(fmt, "</h1>\n")?;
1589 match self.item.inner {
1590 clean::ModuleItem(ref m) => {
1591 item_module(fmt, self.cx, self.item, &m.items)
1593 clean::FunctionItem(ref f) | clean::ForeignFunctionItem(ref f) =>
1594 item_function(fmt, self.cx, self.item, f),
1595 clean::TraitItem(ref t) => item_trait(fmt, self.cx, self.item, t),
1596 clean::StructItem(ref s) => item_struct(fmt, self.cx, self.item, s),
1597 clean::UnionItem(ref s) => item_union(fmt, self.cx, self.item, s),
1598 clean::EnumItem(ref e) => item_enum(fmt, self.cx, self.item, e),
1599 clean::TypedefItem(ref t, _) => item_typedef(fmt, self.cx, self.item, t),
1600 clean::MacroItem(ref m) => item_macro(fmt, self.cx, self.item, m),
1601 clean::PrimitiveItem(ref p) => item_primitive(fmt, self.cx, self.item, p),
1602 clean::StaticItem(ref i) | clean::ForeignStaticItem(ref i) =>
1603 item_static(fmt, self.cx, self.item, i),
1604 clean::ConstantItem(ref c) => item_constant(fmt, self.cx, self.item, c),
1606 // We don't generate pages for any other type.
1613 fn item_path(ty: ItemType, name: &str) -> String {
1615 ItemType::Module => format!("{}/index.html", name),
1616 _ => format!("{}.{}.html", ty.css_class(), name),
1620 fn full_path(cx: &Context, item: &clean::Item) -> String {
1621 let mut s = cx.current.join("::");
1623 s.push_str(item.name.as_ref().unwrap());
1627 fn shorter<'a>(s: Option<&'a str>) -> String {
1629 Some(s) => s.lines().take_while(|line|{
1630 (*line).chars().any(|chr|{
1631 !chr.is_whitespace()
1633 }).collect::<Vec<_>>().join("\n"),
1634 None => "".to_string()
1639 fn plain_summary_line(s: Option<&str>) -> String {
1640 let line = shorter(s).replace("\n", " ");
1641 markdown::plain_summary_line(&line[..])
1644 fn document(w: &mut fmt::Formatter, cx: &Context, item: &clean::Item) -> fmt::Result {
1645 document_stability(w, cx, item)?;
1646 let prefix = render_assoc_const_value(item);
1647 document_full(w, item, cx.render_type, &prefix)?;
1652 fn get_html_diff(w: &mut fmt::Formatter, md_text: &str, render_type: RenderType,
1653 prefix: &str) -> fmt::Result {
1654 if render_type == RenderType::Pulldown {
1655 let output = format!("{}", Markdown(md_text, render_type));
1656 let old = format!("{}", Markdown(md_text, RenderType::Hoedown));
1657 let differences = html_diff::get_differences(&output, &old);
1658 if !differences.is_empty() {
1659 println!("Differences spotted in {:?}:\n{}",
1662 .map(|s| format!("=> {}", s.to_string()))
1663 .collect::<Vec<String>>()
1666 write!(w, "<div class='docblock'>{}{}</div>", prefix, output)
1668 write!(w, "<div class='docblock'>{}{}</div>",
1670 Markdown(md_text, render_type))
1675 fn get_html_diff(w: &mut fmt::Formatter, md_text: &str, render_type: RenderType) -> fmt::Result {
1676 write!(w, "<div class='docblock'>{}</div>", Markdown(md_text, render_type))
1679 fn document_short(w: &mut fmt::Formatter, item: &clean::Item, link: AssocItemLink,
1680 render_type: RenderType, prefix: &str) -> fmt::Result {
1681 if let Some(s) = item.doc_value() {
1682 let markdown = if s.contains('\n') {
1683 format!("{} [Read more]({})",
1684 &plain_summary_line(Some(s)), naive_assoc_href(item, link))
1686 format!("{}", &plain_summary_line(Some(s)))
1688 get_html_diff(&markdown, render_type, prefix)?;
1689 } else if !prefix.is_empty() {
1690 write!(w, "<div class='docblock'>{}</div>", prefix)?;
1695 fn render_assoc_const_value(item: &clean::Item) -> String {
1697 clean::AssociatedConstItem(ref ty, Some(ref default)) => {
1698 highlight::render_with_highlighting(
1699 &format!("{}: {:#} = {}", item.name.as_ref().unwrap(), ty, default),
1709 fn document_full(w: &mut fmt::Formatter, item: &clean::Item,
1710 render_type: RenderType, prefix: &str) -> fmt::Result {
1711 if let Some(s) = item.doc_value() {
1712 get_html_diff(format!("{}{}", md_render_assoc_item(item), s), render_type, prefix)?;
1713 } else if !prefix.is_empty() {
1714 write!(w, "<div class='docblock'>{}</div>", prefix)?;
1719 fn document_stability(w: &mut fmt::Formatter, cx: &Context, item: &clean::Item) -> fmt::Result {
1720 let stabilities = short_stability(item, cx, true);
1721 if !stabilities.is_empty() {
1722 write!(w, "<div class='stability'>")?;
1723 for stability in stabilities {
1724 write!(w, "{}", stability)?;
1726 write!(w, "</div>")?;
1731 fn name_key(name: &str) -> (&str, u64, usize) {
1732 // find number at end
1733 let split = name.bytes().rposition(|b| b < b'0' || b'9' < b).map_or(0, |s| s + 1);
1735 // count leading zeroes
1737 name[split..].bytes().position(|b| b != b'0').map_or(name.len(), |extra| split + extra);
1739 // sort leading zeroes last
1740 let num_zeroes = after_zeroes - split;
1742 match name[split..].parse() {
1743 Ok(n) => (&name[..split], n, num_zeroes),
1744 Err(_) => (name, 0, num_zeroes),
1748 fn item_module(w: &mut fmt::Formatter, cx: &Context,
1749 item: &clean::Item, items: &[clean::Item]) -> fmt::Result {
1750 document(w, cx, item)?;
1752 let mut indices = (0..items.len()).filter(|i| {
1753 if let clean::DefaultImplItem(..) = items[*i].inner {
1756 !items[*i].is_stripped()
1757 }).collect::<Vec<usize>>();
1759 // the order of item types in the listing
1760 fn reorder(ty: ItemType) -> u8 {
1762 ItemType::ExternCrate => 0,
1763 ItemType::Import => 1,
1764 ItemType::Primitive => 2,
1765 ItemType::Module => 3,
1766 ItemType::Macro => 4,
1767 ItemType::Struct => 5,
1768 ItemType::Enum => 6,
1769 ItemType::Constant => 7,
1770 ItemType::Static => 8,
1771 ItemType::Trait => 9,
1772 ItemType::Function => 10,
1773 ItemType::Typedef => 12,
1774 ItemType::Union => 13,
1779 fn cmp(i1: &clean::Item, i2: &clean::Item, idx1: usize, idx2: usize) -> Ordering {
1780 let ty1 = i1.type_();
1781 let ty2 = i2.type_();
1783 return (reorder(ty1), idx1).cmp(&(reorder(ty2), idx2))
1785 let s1 = i1.stability.as_ref().map(|s| s.level);
1786 let s2 = i2.stability.as_ref().map(|s| s.level);
1788 (Some(stability::Unstable), Some(stability::Stable)) => return Ordering::Greater,
1789 (Some(stability::Stable), Some(stability::Unstable)) => return Ordering::Less,
1792 let lhs = i1.name.as_ref().map_or("", |s| &**s);
1793 let rhs = i2.name.as_ref().map_or("", |s| &**s);
1794 name_key(lhs).cmp(&name_key(rhs))
1797 indices.sort_by(|&i1, &i2| cmp(&items[i1], &items[i2], i1, i2));
1798 // This call is to remove reexport duplicates in cases such as:
1803 // pub trait Double { fn foo(); }
1807 // pub use foo::bar::*;
1811 // `Double` will appear twice in the generated docs.
1813 // FIXME: This code is quite ugly and could be improved. Small issue: DefId
1814 // can be identical even if the elements are different (mostly in imports).
1815 // So in case this is an import, we keep everything by adding a "unique id"
1816 // (which is the position in the vector).
1817 indices.dedup_by_key(|i| (items[*i].def_id,
1818 if items[*i].name.as_ref().is_some() {
1819 Some(full_path(cx, &items[*i]).clone())
1824 if items[*i].is_import() {
1830 debug!("{:?}", indices);
1831 let mut curty = None;
1832 for &idx in &indices {
1833 let myitem = &items[idx];
1834 if myitem.is_stripped() {
1838 let myty = Some(myitem.type_());
1839 if curty == Some(ItemType::ExternCrate) && myty == Some(ItemType::Import) {
1840 // Put `extern crate` and `use` re-exports in the same section.
1842 } else if myty != curty {
1843 if curty.is_some() {
1844 write!(w, "</table>")?;
1847 let (short, name) = match myty.unwrap() {
1848 ItemType::ExternCrate |
1849 ItemType::Import => ("reexports", "Reexports"),
1850 ItemType::Module => ("modules", "Modules"),
1851 ItemType::Struct => ("structs", "Structs"),
1852 ItemType::Union => ("unions", "Unions"),
1853 ItemType::Enum => ("enums", "Enums"),
1854 ItemType::Function => ("functions", "Functions"),
1855 ItemType::Typedef => ("types", "Type Definitions"),
1856 ItemType::Static => ("statics", "Statics"),
1857 ItemType::Constant => ("constants", "Constants"),
1858 ItemType::Trait => ("traits", "Traits"),
1859 ItemType::Impl => ("impls", "Implementations"),
1860 ItemType::TyMethod => ("tymethods", "Type Methods"),
1861 ItemType::Method => ("methods", "Methods"),
1862 ItemType::StructField => ("fields", "Struct Fields"),
1863 ItemType::Variant => ("variants", "Variants"),
1864 ItemType::Macro => ("macros", "Macros"),
1865 ItemType::Primitive => ("primitives", "Primitive Types"),
1866 ItemType::AssociatedType => ("associated-types", "Associated Types"),
1867 ItemType::AssociatedConst => ("associated-consts", "Associated Constants"),
1869 write!(w, "<h2 id='{id}' class='section-header'>\
1870 <a href=\"#{id}\">{name}</a></h2>\n<table>",
1871 id = derive_id(short.to_owned()), name = name)?;
1874 match myitem.inner {
1875 clean::ExternCrateItem(ref name, ref src) => {
1876 use html::format::HRef;
1880 write!(w, "<tr><td><code>{}extern crate {} as {};",
1881 VisSpace(&myitem.visibility),
1882 HRef::new(myitem.def_id, src),
1886 write!(w, "<tr><td><code>{}extern crate {};",
1887 VisSpace(&myitem.visibility),
1888 HRef::new(myitem.def_id, name))?
1891 write!(w, "</code></td></tr>")?;
1894 clean::ImportItem(ref import) => {
1895 write!(w, "<tr><td><code>{}{}</code></td></tr>",
1896 VisSpace(&myitem.visibility), *import)?;
1900 if myitem.name.is_none() { continue }
1902 let stabilities = short_stability(myitem, cx, false);
1904 let stab_docs = if !stabilities.is_empty() {
1906 .map(|s| format!("[{}]", s))
1907 .collect::<Vec<_>>()
1914 let unsafety_flag = match myitem.inner {
1915 clean::FunctionItem(ref func) | clean::ForeignFunctionItem(ref func)
1916 if func.unsafety == hir::Unsafety::Unsafe => {
1917 "<a title='unsafe function' href='#'><sup>âš </sup></a>"
1922 let doc_value = myitem.doc_value().unwrap_or("");
1924 <tr class='{stab} module-item'>
1925 <td><a class=\"{class}\" href=\"{href}\"
1926 title='{title_type} {title}'>{name}</a>{unsafety_flag}</td>
1927 <td class='docblock-short'>
1931 name = *myitem.name.as_ref().unwrap(),
1932 stab_docs = stab_docs,
1933 docs = if cx.render_type == RenderType::Hoedown {
1935 shorter(Some(&Markdown(doc_value,
1936 RenderType::Hoedown).to_string())))
1938 format!("{}", MarkdownSummaryLine(doc_value))
1940 class = myitem.type_(),
1941 stab = myitem.stability_class().unwrap_or("".to_string()),
1942 unsafety_flag = unsafety_flag,
1943 href = item_path(myitem.type_(), myitem.name.as_ref().unwrap()),
1944 title_type = myitem.type_(),
1945 title = full_path(cx, myitem))?;
1950 if curty.is_some() {
1951 write!(w, "</table>")?;
1956 fn short_stability(item: &clean::Item, cx: &Context, show_reason: bool) -> Vec<String> {
1957 let mut stability = vec![];
1959 if let Some(stab) = item.stability.as_ref() {
1960 let deprecated_reason = if show_reason && !stab.deprecated_reason.is_empty() {
1961 format!(": {}", stab.deprecated_reason)
1965 if !stab.deprecated_since.is_empty() {
1966 let since = if show_reason {
1967 format!(" since {}", Escape(&stab.deprecated_since))
1971 let text = format!("Deprecated{}{}",
1973 MarkdownHtml(&deprecated_reason, cx.render_type));
1974 stability.push(format!("<div class='stab deprecated'>{}</div>", text))
1977 if stab.level == stability::Unstable {
1979 let unstable_extra = match (!stab.feature.is_empty(),
1980 &cx.shared.issue_tracker_base_url,
1982 (true, &Some(ref tracker_url), Some(issue_no)) if issue_no > 0 =>
1983 format!(" (<code>{} </code><a href=\"{}{}\">#{}</a>)",
1984 Escape(&stab.feature), tracker_url, issue_no, issue_no),
1985 (false, &Some(ref tracker_url), Some(issue_no)) if issue_no > 0 =>
1986 format!(" (<a href=\"{}{}\">#{}</a>)", Escape(&tracker_url), issue_no,
1989 format!(" (<code>{}</code>)", Escape(&stab.feature)),
1992 if stab.unstable_reason.is_empty() {
1993 stability.push(format!("<div class='stab unstable'>\
1994 <span class=microscope>🔬</span> \
1995 This is a nightly-only experimental API. {}\
1999 let text = format!("<summary><span class=microscope>🔬</span> \
2000 This is a nightly-only experimental API. {}\
2003 MarkdownHtml(&stab.unstable_reason, cx.render_type));
2004 stability.push(format!("<div class='stab unstable'><details>{}</details></div>",
2008 stability.push(format!("<div class='stab unstable'>Experimental</div>"))
2011 } else if let Some(depr) = item.deprecation.as_ref() {
2012 let note = if show_reason && !depr.note.is_empty() {
2013 format!(": {}", depr.note)
2017 let since = if show_reason && !depr.since.is_empty() {
2018 format!(" since {}", Escape(&depr.since))
2023 let text = format!("Deprecated{}{}", since, MarkdownHtml(¬e, cx.render_type));
2024 stability.push(format!("<div class='stab deprecated'>{}</div>", text))
2027 if let Some(ref cfg) = item.attrs.cfg {
2028 stability.push(format!("<div class='stab portability'>{}</div>", if show_reason {
2029 cfg.render_long_html()
2031 cfg.render_short_html()
2038 struct Initializer<'a>(&'a str);
2040 impl<'a> fmt::Display for Initializer<'a> {
2041 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2042 let Initializer(s) = *self;
2043 if s.is_empty() { return Ok(()); }
2044 write!(f, "<code> = </code>")?;
2045 write!(f, "<code>{}</code>", Escape(s))
2049 fn item_constant(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
2050 c: &clean::Constant) -> fmt::Result {
2051 write!(w, "<pre class='rust const'>")?;
2052 render_attributes(w, it)?;
2053 write!(w, "{vis}const \
2054 {name}: {typ}{init}</pre>",
2055 vis = VisSpace(&it.visibility),
2056 name = it.name.as_ref().unwrap(),
2058 init = Initializer(&c.expr))?;
2062 fn item_static(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
2063 s: &clean::Static) -> fmt::Result {
2064 write!(w, "<pre class='rust static'>")?;
2065 render_attributes(w, it)?;
2066 write!(w, "{vis}static {mutability}\
2067 {name}: {typ}{init}</pre>",
2068 vis = VisSpace(&it.visibility),
2069 mutability = MutableSpace(s.mutability),
2070 name = it.name.as_ref().unwrap(),
2072 init = Initializer(&s.expr))?;
2076 fn item_function(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
2077 f: &clean::Function) -> fmt::Result {
2078 // FIXME(#24111): remove when `const_fn` is stabilized
2079 let vis_constness = match UnstableFeatures::from_environment() {
2080 UnstableFeatures::Allow => f.constness,
2081 _ => hir::Constness::NotConst
2083 let name_len = format!("{}{}{}{:#}fn {}{:#}",
2084 VisSpace(&it.visibility),
2085 ConstnessSpace(vis_constness),
2086 UnsafetySpace(f.unsafety),
2088 it.name.as_ref().unwrap(),
2090 write!(w, "<pre class='rust fn'>")?;
2091 render_attributes(w, it)?;
2092 write!(w, "{vis}{constness}{unsafety}{abi}fn \
2093 {name}{generics}{decl}{where_clause}</pre>",
2094 vis = VisSpace(&it.visibility),
2095 constness = ConstnessSpace(vis_constness),
2096 unsafety = UnsafetySpace(f.unsafety),
2097 abi = AbiSpace(f.abi),
2098 name = it.name.as_ref().unwrap(),
2099 generics = f.generics,
2100 where_clause = WhereClause { gens: &f.generics, indent: 0, end_newline: true },
2109 fn item_trait(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
2110 t: &clean::Trait) -> fmt::Result {
2111 let mut bounds = String::new();
2112 let mut bounds_plain = String::new();
2113 if !t.bounds.is_empty() {
2114 if !bounds.is_empty() {
2116 bounds_plain.push(' ');
2118 bounds.push_str(": ");
2119 bounds_plain.push_str(": ");
2120 for (i, p) in t.bounds.iter().enumerate() {
2122 bounds.push_str(" + ");
2123 bounds_plain.push_str(" + ");
2125 bounds.push_str(&format!("{}", *p));
2126 bounds_plain.push_str(&format!("{:#}", *p));
2130 // Output the trait definition
2131 write!(w, "<pre class='rust trait'>")?;
2132 render_attributes(w, it)?;
2133 write!(w, "{}{}trait {}{}{}",
2134 VisSpace(&it.visibility),
2135 UnsafetySpace(t.unsafety),
2136 it.name.as_ref().unwrap(),
2140 if !t.generics.where_predicates.is_empty() {
2141 write!(w, "{}", WhereClause { gens: &t.generics, indent: 0, end_newline: true })?;
2146 let types = t.items.iter().filter(|m| m.is_associated_type()).collect::<Vec<_>>();
2147 let consts = t.items.iter().filter(|m| m.is_associated_const()).collect::<Vec<_>>();
2148 let required = t.items.iter().filter(|m| m.is_ty_method()).collect::<Vec<_>>();
2149 let provided = t.items.iter().filter(|m| m.is_method()).collect::<Vec<_>>();
2151 if t.items.is_empty() {
2152 write!(w, "{{ }}")?;
2154 // FIXME: we should be using a derived_id for the Anchors here
2158 render_assoc_item(w, t, AssocItemLink::Anchor(None), ItemType::Trait)?;
2161 if !types.is_empty() && !consts.is_empty() {
2166 render_assoc_item(w, t, AssocItemLink::Anchor(None), ItemType::Trait)?;
2169 if !consts.is_empty() && !required.is_empty() {
2172 for (pos, m) in required.iter().enumerate() {
2174 render_assoc_item(w, m, AssocItemLink::Anchor(None), ItemType::Trait)?;
2177 if pos < required.len() - 1 {
2178 write!(w, "<div class='item-spacer'></div>")?;
2181 if !required.is_empty() && !provided.is_empty() {
2184 for (pos, m) in provided.iter().enumerate() {
2186 render_assoc_item(w, m, AssocItemLink::Anchor(None), ItemType::Trait)?;
2188 clean::MethodItem(ref inner) if !inner.generics.where_predicates.is_empty() => {
2189 write!(w, ",\n {{ ... }}\n")?;
2192 write!(w, " {{ ... }}\n")?;
2195 if pos < provided.len() - 1 {
2196 write!(w, "<div class='item-spacer'></div>")?;
2201 write!(w, "</pre>")?;
2203 // Trait documentation
2204 document(w, cx, it)?;
2206 fn trait_item(w: &mut fmt::Formatter, cx: &Context, m: &clean::Item, t: &clean::Item)
2208 let name = m.name.as_ref().unwrap();
2209 let item_type = m.type_();
2210 let id = derive_id(format!("{}.{}", item_type, name));
2211 let ns_id = derive_id(format!("{}.{}", name, item_type.name_space()));
2212 write!(w, "<h3 id='{id}' class='method'>\
2213 <span id='{ns_id}' class='invisible'><code>",
2216 render_assoc_item(w, m, AssocItemLink::Anchor(Some(&id)), ItemType::Impl)?;
2217 write!(w, "</code>")?;
2218 render_stability_since(w, m, t)?;
2219 write!(w, "</span></h3>")?;
2220 document(w, cx, m)?;
2224 if !types.is_empty() {
2226 <h2 id='associated-types' class='small-section-header'>
2227 Associated Types<a href='#associated-types' class='anchor'></a>
2229 <div class='methods'>
2232 trait_item(w, cx, *t, it)?;
2234 write!(w, "</div>")?;
2237 if !consts.is_empty() {
2239 <h2 id='associated-const' class='small-section-header'>
2240 Associated Constants<a href='#associated-const' class='anchor'></a>
2242 <div class='methods'>
2245 trait_item(w, cx, *t, it)?;
2247 write!(w, "</div>")?;
2250 // Output the documentation for each function individually
2251 if !required.is_empty() {
2253 <h2 id='required-methods' class='small-section-header'>
2254 Required Methods<a href='#required-methods' class='anchor'></a>
2256 <div class='methods'>
2258 for m in &required {
2259 trait_item(w, cx, *m, it)?;
2261 write!(w, "</div>")?;
2263 if !provided.is_empty() {
2265 <h2 id='provided-methods' class='small-section-header'>
2266 Provided Methods<a href='#provided-methods' class='anchor'></a>
2268 <div class='methods'>
2270 for m in &provided {
2271 trait_item(w, cx, *m, it)?;
2273 write!(w, "</div>")?;
2276 // If there are methods directly on this trait object, render them here.
2277 render_assoc_items(w, cx, it, it.def_id, AssocItemRender::All)?;
2279 let cache = cache();
2281 <h2 id='implementors' class='small-section-header'>
2282 Implementors<a href='#implementors' class='anchor'></a>
2284 <ul class='item-list' id='implementors-list'>
2286 if let Some(implementors) = cache.implementors.get(&it.def_id) {
2287 // The DefId is for the first Type found with that name. The bool is
2288 // if any Types with the same name but different DefId have been found.
2289 let mut implementor_dups: FxHashMap<&str, (DefId, bool)> = FxHashMap();
2290 for implementor in implementors {
2291 match implementor.impl_.for_ {
2292 clean::ResolvedPath { ref path, did, is_generic: false, .. } |
2293 clean::BorrowedRef {
2294 type_: box clean::ResolvedPath { ref path, did, is_generic: false, .. },
2297 let &mut (prev_did, ref mut has_duplicates) =
2298 implementor_dups.entry(path.last_name()).or_insert((did, false));
2299 if prev_did != did {
2300 *has_duplicates = true;
2307 for implementor in implementors {
2308 write!(w, "<li><code>")?;
2309 // If there's already another implementor that has the same abbridged name, use the
2310 // full path, for example in `std::iter::ExactSizeIterator`
2311 let use_absolute = match implementor.impl_.for_ {
2312 clean::ResolvedPath { ref path, is_generic: false, .. } |
2313 clean::BorrowedRef {
2314 type_: box clean::ResolvedPath { ref path, is_generic: false, .. },
2316 } => implementor_dups[path.last_name()].1,
2319 fmt_impl_for_trait_page(&implementor.impl_, w, use_absolute)?;
2320 for it in &implementor.impl_.items {
2321 if let clean::TypedefItem(ref tydef, _) = it.inner {
2322 write!(w, "<span class=\"where fmt-newline\"> ")?;
2323 assoc_type(w, it, &vec![], Some(&tydef.type_), AssocItemLink::Anchor(None))?;
2324 write!(w, ";</span>")?;
2327 writeln!(w, "</code></li>")?;
2330 write!(w, "</ul>")?;
2331 write!(w, r#"<script type="text/javascript" async
2332 src="{root_path}/implementors/{path}/{ty}.{name}.js">
2334 root_path = vec![".."; cx.current.len()].join("/"),
2335 path = if it.def_id.is_local() {
2336 cx.current.join("/")
2338 let (ref path, _) = cache.external_paths[&it.def_id];
2339 path[..path.len() - 1].join("/")
2341 ty = it.type_().css_class(),
2342 name = *it.name.as_ref().unwrap())?;
2346 fn naive_assoc_href(it: &clean::Item, link: AssocItemLink) -> String {
2347 use html::item_type::ItemType::*;
2349 let name = it.name.as_ref().unwrap();
2350 let ty = match it.type_() {
2351 Typedef | AssociatedType => AssociatedType,
2355 let anchor = format!("#{}.{}", ty, name);
2357 AssocItemLink::Anchor(Some(ref id)) => format!("#{}", id),
2358 AssocItemLink::Anchor(None) => anchor,
2359 AssocItemLink::GotoSource(did, _) => {
2360 href(did).map(|p| format!("{}{}", p.0, anchor)).unwrap_or(anchor)
2365 fn assoc_const(w: &mut fmt::Formatter,
2368 _default: Option<&String>,
2369 link: AssocItemLink) -> fmt::Result {
2370 write!(w, "const <a href='{}' class=\"constant\"><b>{}</b></a>: {}",
2371 naive_assoc_href(it, link),
2372 it.name.as_ref().unwrap(),
2377 fn assoc_type(w: &mut fmt::Formatter, it: &clean::Item,
2378 bounds: &Vec<clean::TyParamBound>,
2379 default: Option<&clean::Type>,
2380 link: AssocItemLink) -> fmt::Result {
2381 write!(w, "type <a href='{}' class=\"type\">{}</a>",
2382 naive_assoc_href(it, link),
2383 it.name.as_ref().unwrap())?;
2384 if !bounds.is_empty() {
2385 write!(w, ": {}", TyParamBounds(bounds))?
2387 if let Some(default) = default {
2388 write!(w, " = {}", default)?;
2393 fn render_stability_since_raw<'a>(w: &mut fmt::Formatter,
2394 ver: Option<&'a str>,
2395 containing_ver: Option<&'a str>) -> fmt::Result {
2396 if let Some(v) = ver {
2397 if containing_ver != ver && v.len() > 0 {
2398 write!(w, "<div class='since' title='Stable since Rust version {0}'>{0}</div>",
2405 fn render_stability_since(w: &mut fmt::Formatter,
2407 containing_item: &clean::Item) -> fmt::Result {
2408 render_stability_since_raw(w, item.stable_since(), containing_item.stable_since())
2411 fn render_assoc_item(w: &mut fmt::Formatter,
2413 link: AssocItemLink,
2414 parent: ItemType) -> fmt::Result {
2415 fn method(w: &mut fmt::Formatter,
2417 unsafety: hir::Unsafety,
2418 constness: hir::Constness,
2420 g: &clean::Generics,
2422 link: AssocItemLink,
2425 let name = meth.name.as_ref().unwrap();
2426 let anchor = format!("#{}.{}", meth.type_(), name);
2427 let href = match link {
2428 AssocItemLink::Anchor(Some(ref id)) => format!("#{}", id),
2429 AssocItemLink::Anchor(None) => anchor,
2430 AssocItemLink::GotoSource(did, provided_methods) => {
2431 // We're creating a link from an impl-item to the corresponding
2432 // trait-item and need to map the anchored type accordingly.
2433 let ty = if provided_methods.contains(name) {
2439 href(did).map(|p| format!("{}#{}.{}", p.0, ty, name)).unwrap_or(anchor)
2442 // FIXME(#24111): remove when `const_fn` is stabilized
2443 let vis_constness = if is_nightly_build() {
2446 hir::Constness::NotConst
2448 let mut head_len = format!("{}{}{:#}fn {}{:#}",
2449 ConstnessSpace(vis_constness),
2450 UnsafetySpace(unsafety),
2454 let (indent, end_newline) = if parent == ItemType::Trait {
2460 write!(w, "{}{}{}fn <a href='{href}' class='fnname'>{name}</a>\
2461 {generics}{decl}{where_clause}",
2462 ConstnessSpace(vis_constness),
2463 UnsafetySpace(unsafety),
2473 where_clause = WhereClause {
2480 clean::StrippedItem(..) => Ok(()),
2481 clean::TyMethodItem(ref m) => {
2482 method(w, item, m.unsafety, hir::Constness::NotConst,
2483 m.abi, &m.generics, &m.decl, link, parent)
2485 clean::MethodItem(ref m) => {
2486 method(w, item, m.unsafety, m.constness,
2487 m.abi, &m.generics, &m.decl, link, parent)
2489 clean::AssociatedConstItem(ref ty, ref default) => {
2490 assoc_const(w, item, ty, default.as_ref(), link)
2492 clean::AssociatedTypeItem(ref bounds, ref default) => {
2493 assoc_type(w, item, bounds, default.as_ref(), link)
2495 _ => panic!("render_assoc_item called on non-associated-item")
2499 fn item_struct(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
2500 s: &clean::Struct) -> fmt::Result {
2501 write!(w, "<pre class='rust struct'>")?;
2502 render_attributes(w, it)?;
2510 write!(w, "</pre>")?;
2512 document(w, cx, it)?;
2513 let mut fields = s.fields.iter().filter_map(|f| {
2515 clean::StructFieldItem(ref ty) => Some((f, ty)),
2519 if let doctree::Plain = s.struct_type {
2520 if fields.peek().is_some() {
2521 write!(w, "<h2 id='fields' class='fields small-section-header'>
2522 Fields<a href='#fields' class='anchor'></a></h2>")?;
2523 for (field, ty) in fields {
2524 let id = derive_id(format!("{}.{}",
2525 ItemType::StructField,
2526 field.name.as_ref().unwrap()));
2527 let ns_id = derive_id(format!("{}.{}",
2528 field.name.as_ref().unwrap(),
2529 ItemType::StructField.name_space()));
2530 write!(w, "<span id='{id}' class=\"{item_type}\">
2531 <span id='{ns_id}' class='invisible'>
2532 <code>{name}: {ty}</code>
2534 item_type = ItemType::StructField,
2537 name = field.name.as_ref().unwrap(),
2539 if let Some(stability_class) = field.stability_class() {
2540 write!(w, "<span class='stab {stab}'></span>",
2541 stab = stability_class)?;
2543 document(w, cx, field)?;
2547 render_assoc_items(w, cx, it, it.def_id, AssocItemRender::All)
2550 fn item_union(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
2551 s: &clean::Union) -> fmt::Result {
2552 write!(w, "<pre class='rust union'>")?;
2553 render_attributes(w, it)?;
2560 write!(w, "</pre>")?;
2562 document(w, cx, it)?;
2563 let mut fields = s.fields.iter().filter_map(|f| {
2565 clean::StructFieldItem(ref ty) => Some((f, ty)),
2569 if fields.peek().is_some() {
2570 write!(w, "<h2 id='fields' class='fields small-section-header'>
2571 Fields<a href='#fields' class='anchor'></a></h2>")?;
2572 for (field, ty) in fields {
2573 write!(w, "<span id='{shortty}.{name}' class=\"{shortty}\"><code>{name}: {ty}</code>
2575 shortty = ItemType::StructField,
2576 name = field.name.as_ref().unwrap(),
2578 if let Some(stability_class) = field.stability_class() {
2579 write!(w, "<span class='stab {stab}'></span>",
2580 stab = stability_class)?;
2582 document(w, cx, field)?;
2585 render_assoc_items(w, cx, it, it.def_id, AssocItemRender::All)
2588 fn item_enum(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
2589 e: &clean::Enum) -> fmt::Result {
2590 write!(w, "<pre class='rust enum'>")?;
2591 render_attributes(w, it)?;
2592 write!(w, "{}enum {}{}{}",
2593 VisSpace(&it.visibility),
2594 it.name.as_ref().unwrap(),
2596 WhereClause { gens: &e.generics, indent: 0, end_newline: true })?;
2597 if e.variants.is_empty() && !e.variants_stripped {
2598 write!(w, " {{}}")?;
2600 write!(w, " {{\n")?;
2601 for v in &e.variants {
2603 let name = v.name.as_ref().unwrap();
2605 clean::VariantItem(ref var) => {
2607 clean::VariantKind::CLike => write!(w, "{}", name)?,
2608 clean::VariantKind::Tuple(ref tys) => {
2609 write!(w, "{}(", name)?;
2610 for (i, ty) in tys.iter().enumerate() {
2612 write!(w, ", ")?
2614 write!(w, "{}", *ty)?;
2618 clean::VariantKind::Struct(ref s) => {
2634 if e.variants_stripped {
2635 write!(w, " // some variants omitted\n")?;
2639 write!(w, "</pre>")?;
2641 document(w, cx, it)?;
2642 if !e.variants.is_empty() {
2643 write!(w, "<h2 id='variants' class='variants small-section-header'>
2644 Variants<a href='#variants' class='anchor'></a></h2>\n")?;
2645 for variant in &e.variants {
2646 let id = derive_id(format!("{}.{}",
2648 variant.name.as_ref().unwrap()));
2649 let ns_id = derive_id(format!("{}.{}",
2650 variant.name.as_ref().unwrap(),
2651 ItemType::Variant.name_space()));
2652 write!(w, "<span id='{id}' class='variant'>\
2653 <span id='{ns_id}' class='invisible'><code>{name}",
2656 name = variant.name.as_ref().unwrap())?;
2657 if let clean::VariantItem(ref var) = variant.inner {
2658 if let clean::VariantKind::Tuple(ref tys) = var.kind {
2660 for (i, ty) in tys.iter().enumerate() {
2662 write!(w, ", ")?;
2664 write!(w, "{}", *ty)?;
2669 write!(w, "</code></span></span>")?;
2670 document(w, cx, variant)?;
2672 use clean::{Variant, VariantKind};
2673 if let clean::VariantItem(Variant {
2674 kind: VariantKind::Struct(ref s)
2675 }) = variant.inner {
2676 let variant_id = derive_id(format!("{}.{}.fields",
2678 variant.name.as_ref().unwrap()));
2679 write!(w, "<span class='docblock autohide sub-variant' id='{id}'>",
2681 write!(w, "<h3 class='fields'>Fields of <code>{name}</code></h3>\n
2682 <table>", name = variant.name.as_ref().unwrap())?;
2683 for field in &s.fields {
2684 use clean::StructFieldItem;
2685 if let StructFieldItem(ref ty) = field.inner {
2686 let id = derive_id(format!("variant.{}.field.{}",
2687 variant.name.as_ref().unwrap(),
2688 field.name.as_ref().unwrap()));
2689 let ns_id = derive_id(format!("{}.{}.{}.{}",
2690 variant.name.as_ref().unwrap(),
2691 ItemType::Variant.name_space(),
2692 field.name.as_ref().unwrap(),
2693 ItemType::StructField.name_space()));
2694 write!(w, "<tr><td \
2696 <span id='{ns_id}' class='invisible'>\
2697 <code>{f}: {t}</code></span></td><td>",
2700 f = field.name.as_ref().unwrap(),
2702 document(w, cx, field)?;
2703 write!(w, "</td></tr>")?;
2706 write!(w, "</table></span>")?;
2708 render_stability_since(w, variant, it)?;
2711 render_assoc_items(w, cx, it, it.def_id, AssocItemRender::All)?;
2715 fn render_attribute(attr: &ast::MetaItem) -> Option<String> {
2716 let name = attr.name();
2719 Some(format!("{}", name))
2720 } else if let Some(v) = attr.value_str() {
2721 Some(format!("{} = {:?}", name, v.as_str()))
2722 } else if let Some(values) = attr.meta_item_list() {
2723 let display: Vec<_> = values.iter().filter_map(|attr| {
2724 attr.meta_item().and_then(|mi| render_attribute(mi))
2727 if display.len() > 0 {
2728 Some(format!("{}({})", name, display.join(", ")))
2737 const ATTRIBUTE_WHITELIST: &'static [&'static str] = &[
2744 "unsafe_destructor_blind_to_params"
2747 fn render_attributes(w: &mut fmt::Formatter, it: &clean::Item) -> fmt::Result {
2748 let mut attrs = String::new();
2750 for attr in &it.attrs.other_attrs {
2751 let name = attr.name().unwrap();
2752 if !ATTRIBUTE_WHITELIST.contains(&&*name.as_str()) {
2755 if let Some(s) = render_attribute(&attr.meta().unwrap()) {
2756 attrs.push_str(&format!("#[{}]\n", s));
2759 if attrs.len() > 0 {
2760 write!(w, "<div class=\"docblock attributes\">{}</div>", &attrs)?;
2765 fn render_struct(w: &mut fmt::Formatter, it: &clean::Item,
2766 g: Option<&clean::Generics>,
2767 ty: doctree::StructType,
2768 fields: &[clean::Item],
2770 structhead: bool) -> fmt::Result {
2772 VisSpace(&it.visibility),
2773 if structhead {"struct "} else {""},
2774 it.name.as_ref().unwrap())?;
2775 if let Some(g) = g {
2780 if let Some(g) = g {
2781 write!(w, "{}", WhereClause { gens: g, indent: 0, end_newline: true })?
2783 let mut has_visible_fields = false;
2785 for field in fields {
2786 if let clean::StructFieldItem(ref ty) = field.inner {
2787 write!(w, "\n{} {}{}: {},",
2789 VisSpace(&field.visibility),
2790 field.name.as_ref().unwrap(),
2792 has_visible_fields = true;
2796 if has_visible_fields {
2797 if it.has_stripped_fields().unwrap() {
2798 write!(w, "\n{} // some fields omitted", tab)?;
2800 write!(w, "\n{}", tab)?;
2801 } else if it.has_stripped_fields().unwrap() {
2802 // If there are no visible fields we can just display
2803 // `{ /* fields omitted */ }` to save space.
2804 write!(w, " /* fields omitted */ ")?;
2810 for (i, field) in fields.iter().enumerate() {
2815 clean::StrippedItem(box clean::StructFieldItem(..)) => {
2818 clean::StructFieldItem(ref ty) => {
2819 write!(w, "{}{}", VisSpace(&field.visibility), *ty)?
2825 if let Some(g) = g {
2826 write!(w, "{}", WhereClause { gens: g, indent: 0, end_newline: false })?
2831 // Needed for PhantomData.
2832 if let Some(g) = g {
2833 write!(w, "{}", WhereClause { gens: g, indent: 0, end_newline: false })?
2841 fn render_union(w: &mut fmt::Formatter, it: &clean::Item,
2842 g: Option<&clean::Generics>,
2843 fields: &[clean::Item],
2845 structhead: bool) -> fmt::Result {
2847 VisSpace(&it.visibility),
2848 if structhead {"union "} else {""},
2849 it.name.as_ref().unwrap())?;
2850 if let Some(g) = g {
2851 write!(w, "{}", g)?;
2852 write!(w, "{}", WhereClause { gens: g, indent: 0, end_newline: true })?;
2855 write!(w, " {{\n{}", tab)?;
2856 for field in fields {
2857 if let clean::StructFieldItem(ref ty) = field.inner {
2858 write!(w, " {}{}: {},\n{}",
2859 VisSpace(&field.visibility),
2860 field.name.as_ref().unwrap(),
2866 if it.has_stripped_fields().unwrap() {
2867 write!(w, " // some fields omitted\n{}", tab)?;
2873 #[derive(Copy, Clone)]
2874 enum AssocItemLink<'a> {
2875 Anchor(Option<&'a str>),
2876 GotoSource(DefId, &'a FxHashSet<String>),
2879 impl<'a> AssocItemLink<'a> {
2880 fn anchor(&self, id: &'a String) -> Self {
2882 AssocItemLink::Anchor(_) => { AssocItemLink::Anchor(Some(&id)) },
2883 ref other => *other,
2888 enum AssocItemRender<'a> {
2890 DerefFor { trait_: &'a clean::Type, type_: &'a clean::Type, deref_mut_: bool }
2893 #[derive(Copy, Clone, PartialEq)]
2896 ForDeref { mut_: bool },
2899 fn render_assoc_items(w: &mut fmt::Formatter,
2901 containing_item: &clean::Item,
2903 what: AssocItemRender) -> fmt::Result {
2905 let v = match c.impls.get(&it) {
2907 None => return Ok(()),
2909 let (non_trait, traits): (Vec<_>, _) = v.iter().partition(|i| {
2910 i.inner_impl().trait_.is_none()
2912 if !non_trait.is_empty() {
2913 let render_mode = match what {
2914 AssocItemRender::All => {
2916 <h2 id='methods' class='small-section-header'>
2917 Methods<a href='#methods' class='anchor'></a>
2922 AssocItemRender::DerefFor { trait_, type_, deref_mut_ } => {
2924 <h2 id='deref-methods' class='small-section-header'>
2925 Methods from {}<Target = {}><a href='#deref-methods' class='anchor'></a>
2928 RenderMode::ForDeref { mut_: deref_mut_ }
2931 for i in &non_trait {
2932 render_impl(w, cx, i, AssocItemLink::Anchor(None), render_mode,
2933 containing_item.stable_since())?;
2936 if let AssocItemRender::DerefFor { .. } = what {
2939 if !traits.is_empty() {
2940 let deref_impl = traits.iter().find(|t| {
2941 t.inner_impl().trait_.def_id() == c.deref_trait_did
2943 if let Some(impl_) = deref_impl {
2944 let has_deref_mut = traits.iter().find(|t| {
2945 t.inner_impl().trait_.def_id() == c.deref_mut_trait_did
2947 render_deref_methods(w, cx, impl_, containing_item, has_deref_mut)?;
2950 <h2 id='implementations' class='small-section-header'>
2951 Trait Implementations<a href='#implementations' class='anchor'></a>
2955 let did = i.trait_did().unwrap();
2956 let assoc_link = AssocItemLink::GotoSource(did, &i.inner_impl().provided_trait_methods);
2957 render_impl(w, cx, i, assoc_link,
2958 RenderMode::Normal, containing_item.stable_since())?;
2964 fn render_deref_methods(w: &mut fmt::Formatter, cx: &Context, impl_: &Impl,
2965 container_item: &clean::Item, deref_mut: bool) -> fmt::Result {
2966 let deref_type = impl_.inner_impl().trait_.as_ref().unwrap();
2967 let target = impl_.inner_impl().items.iter().filter_map(|item| {
2969 clean::TypedefItem(ref t, true) => Some(&t.type_),
2972 }).next().expect("Expected associated type binding");
2973 let what = AssocItemRender::DerefFor { trait_: deref_type, type_: target,
2974 deref_mut_: deref_mut };
2975 if let Some(did) = target.def_id() {
2976 render_assoc_items(w, cx, container_item, did, what)
2978 if let Some(prim) = target.primitive_type() {
2979 if let Some(&did) = cache().primitive_locations.get(&prim) {
2980 render_assoc_items(w, cx, container_item, did, what)?;
2987 fn render_impl(w: &mut fmt::Formatter, cx: &Context, i: &Impl, link: AssocItemLink,
2988 render_mode: RenderMode, outer_version: Option<&str>) -> fmt::Result {
2989 if render_mode == RenderMode::Normal {
2990 let id = derive_id(match i.inner_impl().trait_ {
2991 Some(ref t) => format!("impl-{}", Escape(&format!("{:#}", t))),
2992 None => "impl".to_string(),
2994 write!(w, "<h3 id='{}' class='impl'><span class='in-band'><code>{}</code>",
2995 id, i.inner_impl())?;
2996 write!(w, "<a href='#{}' class='anchor'></a>", id)?;
2997 write!(w, "</span><span class='out-of-band'>")?;
2998 let since = i.impl_item.stability.as_ref().map(|s| &s.since[..]);
2999 if let Some(l) = (Item { item: &i.impl_item, cx: cx }).src_href() {
3000 write!(w, "<div class='ghost'></div>")?;
3001 render_stability_since_raw(w, since, outer_version)?;
3002 write!(w, "<a class='srclink' href='{}' title='{}'>[src]</a>",
3003 l, "goto source code")?;
3005 render_stability_since_raw(w, since, outer_version)?;
3007 write!(w, "</span>")?;
3008 write!(w, "</h3>\n")?;
3009 if let Some(ref dox) = i.impl_item.doc_value() {
3010 write!(w, "<div class='docblock'>{}</div>", Markdown(dox, cx.render_type))?;
3014 fn doc_impl_item(w: &mut fmt::Formatter, cx: &Context, item: &clean::Item,
3015 link: AssocItemLink, render_mode: RenderMode,
3016 is_default_item: bool, outer_version: Option<&str>,
3017 trait_: Option<&clean::Trait>) -> fmt::Result {
3018 let item_type = item.type_();
3019 let name = item.name.as_ref().unwrap();
3021 let render_method_item: bool = match render_mode {
3022 RenderMode::Normal => true,
3023 RenderMode::ForDeref { mut_: deref_mut_ } => {
3024 let self_type_opt = match item.inner {
3025 clean::MethodItem(ref method) => method.decl.self_type(),
3026 clean::TyMethodItem(ref method) => method.decl.self_type(),
3030 if let Some(self_ty) = self_type_opt {
3031 let (by_mut_ref, by_box) = match self_ty {
3032 SelfTy::SelfBorrowed(_, mutability) |
3033 SelfTy::SelfExplicit(clean::BorrowedRef { mutability, .. }) => {
3034 (mutability == Mutability::Mutable, false)
3036 SelfTy::SelfExplicit(clean::ResolvedPath { did, .. }) => {
3037 (false, Some(did) == cache().owned_box_did)
3039 _ => (false, false),
3042 (deref_mut_ || !by_mut_ref) && !by_box
3050 clean::MethodItem(..) | clean::TyMethodItem(..) => {
3051 // Only render when the method is not static or we allow static methods
3052 if render_method_item {
3053 let id = derive_id(format!("{}.{}", item_type, name));
3054 let ns_id = derive_id(format!("{}.{}", name, item_type.name_space()));
3055 write!(w, "<h4 id='{}' class=\"{}\">", id, item_type)?;
3056 write!(w, "<span id='{}' class='invisible'>", ns_id)?;
3057 write!(w, "<code>")?;
3058 render_assoc_item(w, item, link.anchor(&id), ItemType::Impl)?;
3059 write!(w, "</code>")?;
3060 if let Some(l) = (Item { cx, item }).src_href() {
3061 write!(w, "</span><span class='out-of-band'>")?;
3062 write!(w, "<div class='ghost'></div>")?;
3063 render_stability_since_raw(w, item.stable_since(), outer_version)?;
3064 write!(w, "<a class='srclink' href='{}' title='{}'>[src]</a>",
3065 l, "goto source code")?;
3067 render_stability_since_raw(w, item.stable_since(), outer_version)?;
3069 write!(w, "</span></h4>\n")?;
3072 clean::TypedefItem(ref tydef, _) => {
3073 let id = derive_id(format!("{}.{}", ItemType::AssociatedType, name));
3074 let ns_id = derive_id(format!("{}.{}", name, item_type.name_space()));
3075 write!(w, "<h4 id='{}' class=\"{}\">", id, item_type)?;
3076 write!(w, "<span id='{}' class='invisible'><code>", ns_id)?;
3077 assoc_type(w, item, &Vec::new(), Some(&tydef.type_), link.anchor(&id))?;
3078 write!(w, "</code></span></h4>\n")?;
3080 clean::AssociatedConstItem(ref ty, ref default) => {
3081 let id = derive_id(format!("{}.{}", item_type, name));
3082 let ns_id = derive_id(format!("{}.{}", name, item_type.name_space()));
3083 write!(w, "<h4 id='{}' class=\"{}\">", id, item_type)?;
3084 write!(w, "<span id='{}' class='invisible'><code>", ns_id)?;
3085 assoc_const(w, item, ty, default.as_ref(), link.anchor(&id))?;
3086 write!(w, "</code></span></h4>\n")?;
3088 clean::AssociatedTypeItem(ref bounds, ref default) => {
3089 let id = derive_id(format!("{}.{}", item_type, name));
3090 let ns_id = derive_id(format!("{}.{}", name, item_type.name_space()));
3091 write!(w, "<h4 id='{}' class=\"{}\">", id, item_type)?;
3092 write!(w, "<span id='{}' class='invisible'><code>", ns_id)?;
3093 assoc_type(w, item, bounds, default.as_ref(), link.anchor(&id))?;
3094 write!(w, "</code></span></h4>\n")?;
3096 clean::StrippedItem(..) => return Ok(()),
3097 _ => panic!("can't make docs for trait item with name {:?}", item.name)
3100 if render_method_item || render_mode == RenderMode::Normal {
3101 let prefix = render_assoc_const_value(item);
3102 if !is_default_item {
3103 if let Some(t) = trait_ {
3104 // The trait item may have been stripped so we might not
3105 // find any documentation or stability for it.
3106 if let Some(it) = t.items.iter().find(|i| i.name == item.name) {
3107 // We need the stability of the item from the trait
3108 // because impls can't have a stability.
3109 document_stability(w, cx, it)?;
3110 if item.doc_value().is_some() {
3111 document_full(w, item, cx.render_type, &prefix)?;
3113 // In case the item isn't documented,
3114 // provide short documentation from the trait.
3115 document_short(w, it, link, cx.render_type, &prefix)?;
3119 document_stability(w, cx, item)?;
3120 document_full(w, item, cx.render_type, &prefix)?;
3123 document_stability(w, cx, item)?;
3124 document_short(w, item, link, cx.render_type, &prefix)?;
3130 let traits = &cache().traits;
3131 let trait_ = i.trait_did().and_then(|did| traits.get(&did));
3133 write!(w, "<div class='impl-items'>")?;
3134 for trait_item in &i.inner_impl().items {
3135 doc_impl_item(w, cx, trait_item, link, render_mode,
3136 false, outer_version, trait_)?;
3139 fn render_default_items(w: &mut fmt::Formatter,
3143 render_mode: RenderMode,
3144 outer_version: Option<&str>) -> fmt::Result {
3145 for trait_item in &t.items {
3146 let n = trait_item.name.clone();
3147 if i.items.iter().find(|m| m.name == n).is_some() {
3150 let did = i.trait_.as_ref().unwrap().def_id().unwrap();
3151 let assoc_link = AssocItemLink::GotoSource(did, &i.provided_trait_methods);
3153 doc_impl_item(w, cx, trait_item, assoc_link, render_mode, true,
3154 outer_version, None)?;
3159 // If we've implemented a trait, then also emit documentation for all
3160 // default items which weren't overridden in the implementation block.
3161 if let Some(t) = trait_ {
3162 render_default_items(w, cx, t, &i.inner_impl(), render_mode, outer_version)?;
3164 write!(w, "</div>")?;
3168 fn item_typedef(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
3169 t: &clean::Typedef) -> fmt::Result {
3170 write!(w, "<pre class='rust typedef'>")?;
3171 render_attributes(w, it)?;
3172 write!(w, "type {}{}{where_clause} = {type_};</pre>",
3173 it.name.as_ref().unwrap(),
3175 where_clause = WhereClause { gens: &t.generics, indent: 0, end_newline: true },
3178 document(w, cx, it)?;
3180 // Render any items associated directly to this alias, as otherwise they
3181 // won't be visible anywhere in the docs. It would be nice to also show
3182 // associated items from the aliased type (see discussion in #32077), but
3183 // we need #14072 to make sense of the generics.
3184 render_assoc_items(w, cx, it, it.def_id, AssocItemRender::All)
3187 impl<'a> fmt::Display for Sidebar<'a> {
3188 fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
3191 let parentlen = cx.current.len() - if it.is_mod() {1} else {0};
3193 if it.is_struct() || it.is_trait() || it.is_primitive() || it.is_union()
3194 || it.is_enum() || it.is_mod() || it.is_typedef()
3196 write!(fmt, "<p class='location'>")?;
3198 clean::StructItem(..) => write!(fmt, "Struct ")?,
3199 clean::TraitItem(..) => write!(fmt, "Trait ")?,
3200 clean::PrimitiveItem(..) => write!(fmt, "Primitive Type ")?,
3201 clean::UnionItem(..) => write!(fmt, "Union ")?,
3202 clean::EnumItem(..) => write!(fmt, "Enum ")?,
3203 clean::TypedefItem(..) => write!(fmt, "Type Definition ")?,
3204 clean::ModuleItem(..) => if it.is_crate() {
3205 write!(fmt, "Crate ")?;
3207 write!(fmt, "Module ")?;
3211 write!(fmt, "{}", it.name.as_ref().unwrap())?;
3212 write!(fmt, "</p>")?;
3215 clean::StructItem(ref s) => sidebar_struct(fmt, it, s)?,
3216 clean::TraitItem(ref t) => sidebar_trait(fmt, it, t)?,
3217 clean::PrimitiveItem(ref p) => sidebar_primitive(fmt, it, p)?,
3218 clean::UnionItem(ref u) => sidebar_union(fmt, it, u)?,
3219 clean::EnumItem(ref e) => sidebar_enum(fmt, it, e)?,
3220 clean::TypedefItem(ref t, _) => sidebar_typedef(fmt, it, t)?,
3221 clean::ModuleItem(ref m) => sidebar_module(fmt, it, &m.items)?,
3226 // The sidebar is designed to display sibling functions, modules and
3227 // other miscellaneous information. since there are lots of sibling
3228 // items (and that causes quadratic growth in large modules),
3229 // we refactor common parts into a shared JavaScript file per module.
3230 // still, we don't move everything into JS because we want to preserve
3231 // as much HTML as possible in order to allow non-JS-enabled browsers
3232 // to navigate the documentation (though slightly inefficiently).
3234 write!(fmt, "<p class='location'>")?;
3235 for (i, name) in cx.current.iter().take(parentlen).enumerate() {
3237 write!(fmt, "::<wbr>")?;
3239 write!(fmt, "<a href='{}index.html'>{}</a>",
3240 &cx.root_path()[..(cx.current.len() - i - 1) * 3],
3243 write!(fmt, "</p>")?;
3245 // Sidebar refers to the enclosing module, not this module.
3246 let relpath = if it.is_mod() { "../" } else { "" };
3248 "<script>window.sidebarCurrent = {{\
3253 name = it.name.as_ref().map(|x| &x[..]).unwrap_or(""),
3254 ty = it.type_().css_class(),
3257 // There is no sidebar-items.js beyond the crate root path
3258 // FIXME maybe dynamic crate loading can be merged here
3260 write!(fmt, "<script defer src=\"{path}sidebar-items.js\"></script>",
3268 fn sidebar_assoc_items(it: &clean::Item) -> String {
3269 let mut out = String::new();
3271 if let Some(v) = c.impls.get(&it.def_id) {
3272 if v.iter().any(|i| i.inner_impl().trait_.is_none()) {
3273 out.push_str("<li><a href=\"#methods\">Methods</a></li>");
3276 if v.iter().any(|i| i.inner_impl().trait_.is_some()) {
3277 if let Some(impl_) = v.iter()
3278 .filter(|i| i.inner_impl().trait_.is_some())
3279 .find(|i| i.inner_impl().trait_.def_id() == c.deref_trait_did) {
3280 if let Some(target) = impl_.inner_impl().items.iter().filter_map(|item| {
3282 clean::TypedefItem(ref t, true) => Some(&t.type_),
3286 let inner_impl = target.def_id().or(target.primitive_type().and_then(|prim| {
3287 c.primitive_locations.get(&prim).cloned()
3288 })).and_then(|did| c.impls.get(&did));
3289 if inner_impl.is_some() {
3290 out.push_str("<li><a href=\"#deref-methods\">");
3291 out.push_str(&format!("Methods from {:#}<Target={:#}>",
3292 impl_.inner_impl().trait_.as_ref().unwrap(),
3294 out.push_str("</a></li>");
3298 out.push_str("<li><a href=\"#implementations\">Trait Implementations</a></li>");
3305 fn sidebar_struct(fmt: &mut fmt::Formatter, it: &clean::Item,
3306 s: &clean::Struct) -> fmt::Result {
3307 let mut sidebar = String::new();
3310 .any(|f| if let clean::StructFieldItem(..) = f.inner { true } else { false }) {
3311 if let doctree::Plain = s.struct_type {
3312 sidebar.push_str("<li><a href=\"#fields\">Fields</a></li>");
3316 sidebar.push_str(&sidebar_assoc_items(it));
3318 if !sidebar.is_empty() {
3319 write!(fmt, "<div class=\"block items\"><ul>{}</ul></div>", sidebar)?;
3324 fn sidebar_trait(fmt: &mut fmt::Formatter, it: &clean::Item,
3325 t: &clean::Trait) -> fmt::Result {
3326 let mut sidebar = String::new();
3328 let has_types = t.items.iter().any(|m| m.is_associated_type());
3329 let has_consts = t.items.iter().any(|m| m.is_associated_const());
3330 let has_required = t.items.iter().any(|m| m.is_ty_method());
3331 let has_provided = t.items.iter().any(|m| m.is_method());
3334 sidebar.push_str("<li><a href=\"#associated-types\">Associated Types</a></li>");
3337 sidebar.push_str("<li><a href=\"#associated-const\">Associated Constants</a></li>");
3340 sidebar.push_str("<li><a href=\"#required-methods\">Required Methods</a></li>");
3343 sidebar.push_str("<li><a href=\"#provided-methods\">Provided Methods</a></li>");
3346 sidebar.push_str(&sidebar_assoc_items(it));
3348 sidebar.push_str("<li><a href=\"#implementors\">Implementors</a></li>");
3350 write!(fmt, "<div class=\"block items\"><ul>{}</ul></div>", sidebar)
3353 fn sidebar_primitive(fmt: &mut fmt::Formatter, it: &clean::Item,
3354 _p: &clean::PrimitiveType) -> fmt::Result {
3355 let sidebar = sidebar_assoc_items(it);
3357 if !sidebar.is_empty() {
3358 write!(fmt, "<div class=\"block items\"><ul>{}</ul></div>", sidebar)?;
3363 fn sidebar_typedef(fmt: &mut fmt::Formatter, it: &clean::Item,
3364 _t: &clean::Typedef) -> fmt::Result {
3365 let sidebar = sidebar_assoc_items(it);
3367 if !sidebar.is_empty() {
3368 write!(fmt, "<div class=\"block items\"><ul>{}</ul></div>", sidebar)?;
3373 fn sidebar_union(fmt: &mut fmt::Formatter, it: &clean::Item,
3374 u: &clean::Union) -> fmt::Result {
3375 let mut sidebar = String::new();
3378 .any(|f| if let clean::StructFieldItem(..) = f.inner { true } else { false }) {
3379 sidebar.push_str("<li><a href=\"#fields\">Fields</a></li>");
3382 sidebar.push_str(&sidebar_assoc_items(it));
3384 if !sidebar.is_empty() {
3385 write!(fmt, "<div class=\"block items\"><ul>{}</ul></div>", sidebar)?;
3390 fn sidebar_enum(fmt: &mut fmt::Formatter, it: &clean::Item,
3391 e: &clean::Enum) -> fmt::Result {
3392 let mut sidebar = String::new();
3394 if !e.variants.is_empty() {
3395 sidebar.push_str("<li><a href=\"#variants\">Variants</a></li>");
3398 sidebar.push_str(&sidebar_assoc_items(it));
3400 if !sidebar.is_empty() {
3401 write!(fmt, "<div class=\"block items\"><ul>{}</ul></div>", sidebar)?;
3406 fn sidebar_module(fmt: &mut fmt::Formatter, _it: &clean::Item,
3407 items: &[clean::Item]) -> fmt::Result {
3408 let mut sidebar = String::new();
3410 if items.iter().any(|it| it.type_() == ItemType::ExternCrate ||
3411 it.type_() == ItemType::Import) {
3412 sidebar.push_str(&format!("<li><a href=\"#{id}\">{name}</a></li>",
3414 name = "Reexports"));
3417 // ordering taken from item_module, reorder, where it prioritized elements in a certain order
3418 // to print its headings
3419 for &myty in &[ItemType::Primitive, ItemType::Module, ItemType::Macro, ItemType::Struct,
3420 ItemType::Enum, ItemType::Constant, ItemType::Static, ItemType::Trait,
3421 ItemType::Function, ItemType::Typedef, ItemType::Union, ItemType::Impl,
3422 ItemType::TyMethod, ItemType::Method, ItemType::StructField, ItemType::Variant,
3423 ItemType::AssociatedType, ItemType::AssociatedConst] {
3424 if items.iter().any(|it| {
3425 if let clean::DefaultImplItem(..) = it.inner {
3428 !it.is_stripped() && it.type_() == myty
3431 let (short, name) = match myty {
3432 ItemType::ExternCrate |
3433 ItemType::Import => ("reexports", "Reexports"),
3434 ItemType::Module => ("modules", "Modules"),
3435 ItemType::Struct => ("structs", "Structs"),
3436 ItemType::Union => ("unions", "Unions"),
3437 ItemType::Enum => ("enums", "Enums"),
3438 ItemType::Function => ("functions", "Functions"),
3439 ItemType::Typedef => ("types", "Type Definitions"),
3440 ItemType::Static => ("statics", "Statics"),
3441 ItemType::Constant => ("constants", "Constants"),
3442 ItemType::Trait => ("traits", "Traits"),
3443 ItemType::Impl => ("impls", "Implementations"),
3444 ItemType::TyMethod => ("tymethods", "Type Methods"),
3445 ItemType::Method => ("methods", "Methods"),
3446 ItemType::StructField => ("fields", "Struct Fields"),
3447 ItemType::Variant => ("variants", "Variants"),
3448 ItemType::Macro => ("macros", "Macros"),
3449 ItemType::Primitive => ("primitives", "Primitive Types"),
3450 ItemType::AssociatedType => ("associated-types", "Associated Types"),
3451 ItemType::AssociatedConst => ("associated-consts", "Associated Constants"),
3453 sidebar.push_str(&format!("<li><a href=\"#{id}\">{name}</a></li>",
3459 if !sidebar.is_empty() {
3460 write!(fmt, "<div class=\"block items\"><ul>{}</ul></div>", sidebar)?;
3465 impl<'a> fmt::Display for Source<'a> {
3466 fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
3467 let Source(s) = *self;
3468 let lines = s.lines().count();
3470 let mut tmp = lines;
3475 write!(fmt, "<pre class=\"line-numbers\">")?;
3476 for i in 1..lines + 1 {
3477 write!(fmt, "<span id=\"{0}\">{0:1$}</span>\n", i, cols)?;
3479 write!(fmt, "</pre>")?;
3480 write!(fmt, "{}", highlight::render_with_highlighting(s, None, None, None))?;
3485 fn item_macro(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
3486 t: &clean::Macro) -> fmt::Result {
3487 w.write_str(&highlight::render_with_highlighting(&t.source,
3494 fn item_primitive(w: &mut fmt::Formatter, cx: &Context,
3496 _p: &clean::PrimitiveType) -> fmt::Result {
3497 document(w, cx, it)?;
3498 render_assoc_items(w, cx, it, it.def_id, AssocItemRender::All)
3501 const BASIC_KEYWORDS: &'static str = "rust, rustlang, rust-lang";
3503 fn make_item_keywords(it: &clean::Item) -> String {
3504 format!("{}, {}", BASIC_KEYWORDS, it.name.as_ref().unwrap())
3507 fn get_index_search_type(item: &clean::Item) -> Option<IndexItemFunctionType> {
3508 let decl = match item.inner {
3509 clean::FunctionItem(ref f) => &f.decl,
3510 clean::MethodItem(ref m) => &m.decl,
3511 clean::TyMethodItem(ref m) => &m.decl,
3515 let inputs = decl.inputs.values.iter().map(|arg| get_index_type(&arg.type_)).collect();
3516 let output = match decl.output {
3517 clean::FunctionRetTy::Return(ref return_type) => Some(get_index_type(return_type)),
3521 Some(IndexItemFunctionType { inputs: inputs, output: output })
3524 fn get_index_type(clean_type: &clean::Type) -> Type {
3525 Type { name: get_index_type_name(clean_type).map(|s| s.to_ascii_lowercase()) }
3528 fn get_index_type_name(clean_type: &clean::Type) -> Option<String> {
3530 clean::ResolvedPath { ref path, .. } => {
3531 let segments = &path.segments;
3532 Some(segments[segments.len() - 1].name.clone())
3534 clean::Generic(ref s) => Some(s.clone()),
3535 clean::Primitive(ref p) => Some(format!("{:?}", p)),
3536 clean::BorrowedRef { ref type_, .. } => get_index_type_name(type_),
3537 // FIXME: add all from clean::Type.
3542 pub fn cache() -> Arc<Cache> {
3543 CACHE_KEY.with(|c| c.borrow().clone())
3548 fn test_unique_id() {
3549 let input = ["foo", "examples", "examples", "method.into_iter","examples",
3550 "method.into_iter", "foo", "main", "search", "methods",
3551 "examples", "method.into_iter", "assoc_type.Item", "assoc_type.Item"];
3552 let expected = ["foo", "examples", "examples-1", "method.into_iter", "examples-2",
3553 "method.into_iter-1", "foo-1", "main-1", "search-1", "methods-1",
3554 "examples-3", "method.into_iter-2", "assoc_type.Item", "assoc_type.Item-1"];
3557 let actual: Vec<String> = input.iter().map(|s| derive_id(s.to_string())).collect();
3558 assert_eq!(&actual[..], expected);
3567 fn test_name_key() {
3568 assert_eq!(name_key("0"), ("", 0, 1));
3569 assert_eq!(name_key("123"), ("", 123, 0));
3570 assert_eq!(name_key("Fruit"), ("Fruit", 0, 0));
3571 assert_eq!(name_key("Fruit0"), ("Fruit", 0, 1));
3572 assert_eq!(name_key("Fruit0000"), ("Fruit", 0, 4));
3573 assert_eq!(name_key("Fruit01"), ("Fruit", 1, 1));
3574 assert_eq!(name_key("Fruit10"), ("Fruit", 10, 0));
3575 assert_eq!(name_key("Fruit123"), ("Fruit", 123, 0));
3580 fn test_name_sorting() {
3581 let names = ["Apple",
3583 "Fruit", "Fruit0", "Fruit00",
3584 "Fruit1", "Fruit01",
3585 "Fruit2", "Fruit02",
3589 let mut sorted = names.to_owned();
3590 sorted.sort_by_key(|&s| name_key(s));
3591 assert_eq!(names, sorted);