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};
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::middle::cstore::LOCAL_CRATE;
59 use rustc::hir::def_id::{CRATE_DEF_INDEX, DefId};
60 use rustc::middle::privacy::AccessLevels;
61 use rustc::middle::stability;
62 use rustc::session::config::get_unstable_features_setting;
64 use rustc::util::nodemap::{FnvHashMap, FnvHashSet};
65 use rustc_data_structures::flock;
67 use clean::{self, Attributes, GetDefId, SelfTy, Mutability};
70 use html::escape::Escape;
71 use html::format::{ConstnessSpace};
72 use html::format::{TyParamBounds, WhereClause, href, AbiSpace};
73 use html::format::{VisSpace, Method, UnsafetySpace, MutableSpace};
74 use html::format::fmt_impl_for_trait_page;
75 use html::item_type::ItemType;
76 use html::markdown::{self, Markdown};
77 use html::{highlight, layout};
79 /// A pair of name and its optional document.
80 pub type NameDoc = (String, Option<String>);
82 /// Major driving force in all rustdoc rendering. This contains information
83 /// about where in the tree-like hierarchy rendering is occurring and controls
84 /// how the current page is being rendered.
86 /// It is intended that this context is a lightweight object which can be fairly
87 /// easily cloned because it is cloned per work-job (about once per item in the
91 /// Current hierarchy of components leading down to what's currently being
93 pub current: Vec<String>,
94 /// String representation of how to get back to the root path of the 'doc/'
95 /// folder in terms of a relative URL.
96 pub root_path: String,
97 /// The current destination folder of where HTML artifacts should be placed.
98 /// This changes as the context descends into the module hierarchy.
100 /// A flag, which when `true`, will render pages which redirect to the
101 /// real location of an item. This is used to allow external links to
102 /// publicly reused items to redirect to the right location.
103 pub render_redirect_pages: bool,
104 pub shared: Arc<SharedContext>,
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: FnvHashMap<PathBuf, String>,
120 /// All the passes that were run on this crate.
121 pub passes: FnvHashSet<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: FnvHashMap<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: FnvHashMap<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: FnvHashMap<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: FnvHashMap<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: FnvHashMap<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: FnvHashMap<DefId, Vec<Implementor>>,
248 /// Cache of where external crate documentation can be found.
249 pub extern_locations: FnvHashMap<ast::CrateNum, (String, ExternalLocation)>,
251 /// Cache of where documentation for primitives can be found.
252 pub primitive_locations: FnvHashMap<clean::PrimitiveType, ast::CrateNum>,
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>,
265 seen_modules: FnvHashSet<DefId>,
268 deref_trait_did: Option<DefId>,
269 deref_mut_trait_did: Option<DefId>,
271 // In rare case where a structure is defined in one module but implemented
272 // in another, if the implementing module is parsed before defining module,
273 // then the fully qualified name of the structure isn't presented in `paths`
274 // yet when its implementation methods are being indexed. Caches such methods
275 // and their parent id here and indexes them at the end of crate parsing.
276 orphan_impl_items: Vec<(DefId, clean::Item)>,
279 /// Temporary storage for data obtained during `RustdocVisitor::clean()`.
280 /// Later on moved into `CACHE_KEY`.
282 pub struct RenderInfo {
283 pub inlined: FnvHashSet<DefId>,
284 pub external_paths: ::core::ExternalPaths,
285 pub external_typarams: FnvHashMap<DefId, String>,
286 pub deref_trait_did: Option<DefId>,
287 pub deref_mut_trait_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<FnvHashMap<String, usize>> =
385 RefCell::new(init_ids()));
387 fn init_ids() -> FnvHashMap<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,
439 passes: FnvHashSet<String>,
440 css_file_extension: Option<PathBuf>,
441 renderinfo: RenderInfo) -> Result<(), Error> {
442 let src_root = match krate.src.parent() {
443 Some(p) => p.to_path_buf(),
444 None => PathBuf::new(),
446 let mut scx = SharedContext {
449 include_sources: true,
450 local_sources: FnvHashMap(),
451 issue_tracker_base_url: None,
452 layout: layout::Layout {
453 logo: "".to_string(),
454 favicon: "".to_string(),
455 external_html: external_html.clone(),
456 krate: krate.name.clone(),
457 playground_url: "".to_string(),
459 css_file_extension: css_file_extension.clone(),
462 // Crawl the crate attributes looking for attributes which control how we're
463 // going to emit HTML
464 if let Some(attrs) = krate.module.as_ref().map(|m| m.attrs.list("doc")) {
467 clean::NameValue(ref x, ref s)
468 if "html_favicon_url" == *x => {
469 scx.layout.favicon = s.to_string();
471 clean::NameValue(ref x, ref s)
472 if "html_logo_url" == *x => {
473 scx.layout.logo = s.to_string();
475 clean::NameValue(ref x, ref s)
476 if "html_playground_url" == *x => {
477 scx.layout.playground_url = s.to_string();
478 markdown::PLAYGROUND_KRATE.with(|slot| {
479 if slot.borrow().is_none() {
480 let name = krate.name.clone();
481 *slot.borrow_mut() = Some(Some(name));
485 clean::NameValue(ref x, ref s)
486 if "issue_tracker_base_url" == *x => {
487 scx.issue_tracker_base_url = Some(s.to_string());
490 if "html_no_source" == *x => {
491 scx.include_sources = false;
497 try_err!(mkdir(&dst), &dst);
498 krate = render_sources(&dst, &mut scx, krate)?;
501 root_path: String::new(),
503 render_redirect_pages: false,
504 shared: Arc::new(scx),
507 // Crawl the crate to build various caches used for the output
516 let external_paths = external_paths.into_iter()
517 .map(|(k, (v, t))| (k, (v, ItemType::from(t))))
520 let mut cache = Cache {
522 external_paths: external_paths,
524 implementors: FnvHashMap(),
526 parent_stack: Vec::new(),
527 search_index: Vec::new(),
528 parent_is_trait_impl: false,
529 extern_locations: FnvHashMap(),
530 primitive_locations: FnvHashMap(),
531 seen_modules: FnvHashSet(),
534 access_levels: krate.access_levels.clone(),
535 orphan_impl_items: Vec::new(),
536 traits: mem::replace(&mut krate.external_traits, FnvHashMap()),
537 deref_trait_did: deref_trait_did,
538 deref_mut_trait_did: deref_mut_trait_did,
539 typarams: external_typarams,
542 // Cache where all our extern crates are located
543 for &(n, ref e) in &krate.externs {
544 cache.extern_locations.insert(n, (e.name.clone(),
545 extern_location(e, &cx.dst)));
546 let did = DefId { krate: n, index: CRATE_DEF_INDEX };
547 cache.external_paths.insert(did, (vec![e.name.to_string()], ItemType::Module));
550 // Cache where all known primitives have their documentation located.
552 // Favor linking to as local extern as possible, so iterate all crates in
553 // reverse topological order.
554 for &(n, ref e) in krate.externs.iter().rev() {
555 for &prim in &e.primitives {
556 cache.primitive_locations.insert(prim, n);
559 for &prim in &krate.primitives {
560 cache.primitive_locations.insert(prim, LOCAL_CRATE);
563 cache.stack.push(krate.name.clone());
564 krate = cache.fold_crate(krate);
566 // Build our search index
567 let index = build_index(&krate, &mut cache);
569 // Freeze the cache now that the index has been built. Put an Arc into TLS
570 // for future parallelization opportunities
571 let cache = Arc::new(cache);
572 CACHE_KEY.with(|v| *v.borrow_mut() = cache.clone());
573 CURRENT_LOCATION_KEY.with(|s| s.borrow_mut().clear());
575 write_shared(&cx, &krate, &*cache, index)?;
577 // And finally render the whole crate's documentation
581 /// Build the search index from the collected metadata
582 fn build_index(krate: &clean::Crate, cache: &mut Cache) -> String {
583 let mut nodeid_to_pathid = FnvHashMap();
584 let mut crate_items = Vec::with_capacity(cache.search_index.len());
585 let mut crate_paths = Vec::<Json>::new();
587 let Cache { ref mut search_index,
588 ref orphan_impl_items,
589 ref mut paths, .. } = *cache;
591 // Attach all orphan items to the type's definition if the type
592 // has since been learned.
593 for &(did, ref item) in orphan_impl_items {
594 if let Some(&(ref fqp, _)) = paths.get(&did) {
595 search_index.push(IndexItem {
597 name: item.name.clone().unwrap(),
598 path: fqp[..fqp.len() - 1].join("::"),
599 desc: Escape(&shorter(item.doc_value())).to_string(),
602 search_type: get_index_search_type(&item),
607 // Reduce `NodeId` in paths into smaller sequential numbers,
608 // and prune the paths that do not appear in the index.
609 let mut lastpath = String::new();
610 let mut lastpathid = 0usize;
612 for item in search_index {
613 item.parent_idx = item.parent.map(|nodeid| {
614 if nodeid_to_pathid.contains_key(&nodeid) {
615 *nodeid_to_pathid.get(&nodeid).unwrap()
617 let pathid = lastpathid;
618 nodeid_to_pathid.insert(nodeid, pathid);
621 let &(ref fqp, short) = paths.get(&nodeid).unwrap();
622 crate_paths.push(((short as usize), fqp.last().unwrap().clone()).to_json());
627 // Omit the parent path if it is same to that of the prior item.
628 if lastpath == item.path {
631 lastpath = item.path.clone();
633 crate_items.push(item.to_json());
636 let crate_doc = krate.module.as_ref().map(|module| {
637 Escape(&shorter(module.doc_value())).to_string()
638 }).unwrap_or(String::new());
640 let mut crate_data = BTreeMap::new();
641 crate_data.insert("doc".to_owned(), Json::String(crate_doc));
642 crate_data.insert("items".to_owned(), Json::Array(crate_items));
643 crate_data.insert("paths".to_owned(), Json::Array(crate_paths));
645 // Collect the index into a string
646 format!("searchIndex[{}] = {};",
647 as_json(&krate.name),
648 Json::Object(crate_data))
651 fn write_shared(cx: &Context,
652 krate: &clean::Crate,
654 search_index: String) -> Result<(), Error> {
655 // Write out the shared files. Note that these are shared among all rustdoc
656 // docs placed in the output directory, so this needs to be a synchronized
657 // operation with respect to all other rustdocs running around.
658 try_err!(mkdir(&cx.dst), &cx.dst);
659 let _lock = flock::Lock::panicking_new(&cx.dst.join(".lock"), true, true, true);
661 // Add all the static files. These may already exist, but we just
662 // overwrite them anyway to make sure that they're fresh and up-to-date.
664 write(cx.dst.join("jquery.js"),
665 include_bytes!("static/jquery-2.1.4.min.js"))?;
666 write(cx.dst.join("main.js"),
667 include_bytes!("static/main.js"))?;
668 write(cx.dst.join("playpen.js"),
669 include_bytes!("static/playpen.js"))?;
670 write(cx.dst.join("rustdoc.css"),
671 include_bytes!("static/rustdoc.css"))?;
672 write(cx.dst.join("main.css"),
673 include_bytes!("static/styles/main.css"))?;
674 if let Some(ref css) = cx.shared.css_file_extension {
675 let mut content = String::new();
676 let css = css.as_path();
677 let mut f = try_err!(File::open(css), css);
679 try_err!(f.read_to_string(&mut content), css);
680 let css = cx.dst.join("theme.css");
681 let css = css.as_path();
682 let mut f = try_err!(File::create(css), css);
683 try_err!(write!(f, "{}", &content), css);
685 write(cx.dst.join("normalize.css"),
686 include_bytes!("static/normalize.css"))?;
687 write(cx.dst.join("FiraSans-Regular.woff"),
688 include_bytes!("static/FiraSans-Regular.woff"))?;
689 write(cx.dst.join("FiraSans-Medium.woff"),
690 include_bytes!("static/FiraSans-Medium.woff"))?;
691 write(cx.dst.join("FiraSans-LICENSE.txt"),
692 include_bytes!("static/FiraSans-LICENSE.txt"))?;
693 write(cx.dst.join("Heuristica-Italic.woff"),
694 include_bytes!("static/Heuristica-Italic.woff"))?;
695 write(cx.dst.join("Heuristica-LICENSE.txt"),
696 include_bytes!("static/Heuristica-LICENSE.txt"))?;
697 write(cx.dst.join("SourceSerifPro-Regular.woff"),
698 include_bytes!("static/SourceSerifPro-Regular.woff"))?;
699 write(cx.dst.join("SourceSerifPro-Bold.woff"),
700 include_bytes!("static/SourceSerifPro-Bold.woff"))?;
701 write(cx.dst.join("SourceSerifPro-LICENSE.txt"),
702 include_bytes!("static/SourceSerifPro-LICENSE.txt"))?;
703 write(cx.dst.join("SourceCodePro-Regular.woff"),
704 include_bytes!("static/SourceCodePro-Regular.woff"))?;
705 write(cx.dst.join("SourceCodePro-Semibold.woff"),
706 include_bytes!("static/SourceCodePro-Semibold.woff"))?;
707 write(cx.dst.join("SourceCodePro-LICENSE.txt"),
708 include_bytes!("static/SourceCodePro-LICENSE.txt"))?;
709 write(cx.dst.join("LICENSE-MIT.txt"),
710 include_bytes!("static/LICENSE-MIT.txt"))?;
711 write(cx.dst.join("LICENSE-APACHE.txt"),
712 include_bytes!("static/LICENSE-APACHE.txt"))?;
713 write(cx.dst.join("COPYRIGHT.txt"),
714 include_bytes!("static/COPYRIGHT.txt"))?;
716 fn collect(path: &Path, krate: &str,
717 key: &str) -> io::Result<Vec<String>> {
718 let mut ret = Vec::new();
720 for line in BufReader::new(File::open(path)?).lines() {
722 if !line.starts_with(key) {
725 if line.starts_with(&format!(r#"{}["{}"]"#, key, krate)) {
728 ret.push(line.to_string());
734 // Update the search index
735 let dst = cx.dst.join("search-index.js");
736 let all_indexes = try_err!(collect(&dst, &krate.name, "searchIndex"), &dst);
737 let mut w = try_err!(File::create(&dst), &dst);
738 try_err!(writeln!(&mut w, "var searchIndex = {{}};"), &dst);
739 try_err!(writeln!(&mut w, "{}", search_index), &dst);
740 for index in &all_indexes {
741 try_err!(writeln!(&mut w, "{}", *index), &dst);
743 try_err!(writeln!(&mut w, "initSearch(searchIndex);"), &dst);
745 // Update the list of all implementors for traits
746 let dst = cx.dst.join("implementors");
747 try_err!(mkdir(&dst), &dst);
748 for (&did, imps) in &cache.implementors {
749 // Private modules can leak through to this phase of rustdoc, which
750 // could contain implementations for otherwise private types. In some
751 // rare cases we could find an implementation for an item which wasn't
752 // indexed, so we just skip this step in that case.
754 // FIXME: this is a vague explanation for why this can't be a `get`, in
755 // theory it should be...
756 let &(ref remote_path, remote_item_type) = match cache.paths.get(&did) {
758 None => match cache.external_paths.get(&did) {
764 let mut mydst = dst.clone();
765 for part in &remote_path[..remote_path.len() - 1] {
767 try_err!(mkdir(&mydst), &mydst);
769 mydst.push(&format!("{}.{}.js",
770 remote_item_type.css_class(),
771 remote_path[remote_path.len() - 1]));
772 let all_implementors = try_err!(collect(&mydst, &krate.name,
776 try_err!(mkdir(mydst.parent().unwrap()),
777 &mydst.parent().unwrap().to_path_buf());
778 let mut f = BufWriter::new(try_err!(File::create(&mydst), &mydst));
779 try_err!(writeln!(&mut f, "(function() {{var implementors = {{}};"), &mydst);
781 for implementor in &all_implementors {
782 try_err!(write!(&mut f, "{}", *implementor), &mydst);
785 try_err!(write!(&mut f, r#"implementors["{}"] = ["#, krate.name), &mydst);
787 // If the trait and implementation are in the same crate, then
788 // there's no need to emit information about it (there's inlining
789 // going on). If they're in different crates then the crate defining
790 // the trait will be interested in our implementation.
791 if imp.def_id.krate == did.krate { continue }
792 try_err!(write!(&mut f, r#""{}","#, imp.impl_), &mydst);
794 try_err!(writeln!(&mut f, r"];"), &mydst);
795 try_err!(writeln!(&mut f, "{}", r"
796 if (window.register_implementors) {
797 window.register_implementors(implementors);
799 window.pending_implementors = implementors;
802 try_err!(writeln!(&mut f, r"}})()"), &mydst);
807 fn render_sources(dst: &Path, scx: &mut SharedContext,
808 krate: clean::Crate) -> Result<clean::Crate, Error> {
809 info!("emitting source files");
810 let dst = dst.join("src");
811 try_err!(mkdir(&dst), &dst);
812 let dst = dst.join(&krate.name);
813 try_err!(mkdir(&dst), &dst);
814 let mut folder = SourceCollector {
818 Ok(folder.fold_crate(krate))
821 /// Writes the entire contents of a string to a destination, not attempting to
822 /// catch any errors.
823 fn write(dst: PathBuf, contents: &[u8]) -> Result<(), Error> {
824 Ok(try_err!(try_err!(File::create(&dst), &dst).write_all(contents), &dst))
827 /// Makes a directory on the filesystem, failing the thread if an error occurs
828 /// and skipping if the directory already exists.
830 /// Note that this also handles races as rustdoc is likely to be run
831 /// concurrently against another invocation.
832 fn mkdir(path: &Path) -> io::Result<()> {
833 match fs::create_dir(path) {
835 Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists => Ok(()),
840 /// Returns a documentation-level item type from the item.
841 fn item_type(item: &clean::Item) -> ItemType {
845 /// Takes a path to a source file and cleans the path to it. This canonicalizes
846 /// things like ".." to components which preserve the "top down" hierarchy of a
847 /// static HTML tree. Each component in the cleaned path will be passed as an
848 /// argument to `f`. The very last component of the path (ie the file name) will
849 /// be passed to `f` if `keep_filename` is true, and ignored otherwise.
850 // FIXME (#9639): The closure should deal with &[u8] instead of &str
851 // FIXME (#9639): This is too conservative, rejecting non-UTF-8 paths
852 fn clean_srcpath<F>(src_root: &Path, p: &Path, keep_filename: bool, mut f: F) where
855 // make it relative, if possible
856 let p = p.strip_prefix(src_root).unwrap_or(p);
858 let mut iter = p.components().peekable();
860 while let Some(c) = iter.next() {
861 if !keep_filename && iter.peek().is_none() {
866 Component::ParentDir => f("up"),
867 Component::Normal(c) => f(c.to_str().unwrap()),
873 /// Attempts to find where an external crate is located, given that we're
874 /// rendering in to the specified source destination.
875 fn extern_location(e: &clean::ExternalCrate, dst: &Path) -> ExternalLocation {
876 // See if there's documentation generated into the local directory
877 let local_location = dst.join(&e.name);
878 if local_location.is_dir() {
882 // Failing that, see if there's an attribute specifying where to find this
884 e.attrs.list("doc").value("html_root_url").map(|url| {
885 let mut url = url.to_owned();
886 if !url.ends_with("/") {
890 }).unwrap_or(Unknown) // Well, at least we tried.
893 impl<'a> DocFolder for SourceCollector<'a> {
894 fn fold_item(&mut self, item: clean::Item) -> Option<clean::Item> {
895 // If we're including source files, and we haven't seen this file yet,
896 // then we need to render it out to the filesystem
897 if self.scx.include_sources
898 // skip all invalid spans
899 && item.source.filename != ""
900 // macros from other libraries get special filenames which we can
902 && !(item.source.filename.starts_with("<")
903 && item.source.filename.ends_with("macros>")) {
905 // If it turns out that we couldn't read this file, then we probably
906 // can't read any of the files (generating html output from json or
907 // something like that), so just don't include sources for the
908 // entire crate. The other option is maintaining this mapping on a
909 // per-file basis, but that's probably not worth it...
911 .include_sources = match self.emit_source(&item.source.filename) {
914 println!("warning: source code was requested to be rendered, \
915 but processing `{}` had an error: {}",
916 item.source.filename, e);
917 println!(" skipping rendering of source code");
922 self.fold_item_recur(item)
926 impl<'a> SourceCollector<'a> {
927 /// Renders the given filename into its corresponding HTML source file.
928 fn emit_source(&mut self, filename: &str) -> io::Result<()> {
929 let p = PathBuf::from(filename);
930 if self.scx.local_sources.contains_key(&p) {
931 // We've already emitted this source
935 let mut contents = Vec::new();
936 File::open(&p).and_then(|mut f| f.read_to_end(&mut contents))?;
938 let contents = str::from_utf8(&contents).unwrap();
940 // Remove the utf-8 BOM if any
941 let contents = if contents.starts_with("\u{feff}") {
947 // Create the intermediate directories
948 let mut cur = self.dst.clone();
949 let mut root_path = String::from("../../");
950 let mut href = String::new();
951 clean_srcpath(&self.scx.src_root, &p, false, |component| {
953 mkdir(&cur).unwrap();
954 root_path.push_str("../");
955 href.push_str(component);
958 let mut fname = p.file_name().expect("source has no filename")
962 href.push_str(&fname.to_string_lossy());
964 let mut w = BufWriter::new(File::create(&cur)?);
965 let title = format!("{} -- source", cur.file_name().unwrap()
967 let desc = format!("Source to the Rust file `{}`.", filename);
968 let page = layout::Page {
971 root_path: &root_path,
973 keywords: BASIC_KEYWORDS,
975 layout::render(&mut w, &self.scx.layout,
976 &page, &(""), &Source(contents),
977 self.scx.css_file_extension.is_some())?;
979 self.scx.local_sources.insert(p, href);
984 impl DocFolder for Cache {
985 fn fold_item(&mut self, item: clean::Item) -> Option<clean::Item> {
986 // If this is a stripped module,
987 // we don't want it or its children in the search index.
988 let orig_stripped_mod = match item.inner {
989 clean::StrippedItem(box clean::ModuleItem(..)) => {
990 mem::replace(&mut self.stripped_mod, true)
992 _ => self.stripped_mod,
995 // Inlining can cause us to visit the same item multiple times.
996 // (i.e. relevant for gathering impls and implementors)
997 let orig_seen_mod = if item.is_mod() {
998 let seen_this = self.seen_mod || !self.seen_modules.insert(item.def_id);
999 mem::replace(&mut self.seen_mod, seen_this)
1004 // Register any generics to their corresponding string. This is used
1005 // when pretty-printing types
1006 if let Some(generics) = item.inner.generics() {
1007 self.generics(generics);
1011 // Propagate a trait methods' documentation to all implementors of the
1013 if let clean::TraitItem(ref t) = item.inner {
1014 self.traits.insert(item.def_id, t.clone());
1017 // Collect all the implementors of traits.
1018 if let clean::ImplItem(ref i) = item.inner {
1019 if let Some(did) = i.trait_.def_id() {
1020 self.implementors.entry(did).or_insert(vec![]).push(Implementor {
1021 def_id: item.def_id,
1022 stability: item.stability.clone(),
1029 // Index this method for searching later on
1030 if let Some(ref s) = item.name {
1031 let (parent, is_inherent_impl_item) = match item.inner {
1032 clean::StrippedItem(..) => ((None, None), false),
1033 clean::AssociatedConstItem(..) |
1034 clean::TypedefItem(_, true) if self.parent_is_trait_impl => {
1035 // skip associated items in trait impls
1036 ((None, None), false)
1038 clean::AssociatedTypeItem(..) |
1039 clean::TyMethodItem(..) |
1040 clean::StructFieldItem(..) |
1041 clean::VariantItem(..) => {
1042 ((Some(*self.parent_stack.last().unwrap()),
1043 Some(&self.stack[..self.stack.len() - 1])),
1046 clean::MethodItem(..) | clean::AssociatedConstItem(..) => {
1047 if self.parent_stack.is_empty() {
1048 ((None, None), false)
1050 let last = self.parent_stack.last().unwrap();
1052 let path = match self.paths.get(&did) {
1053 // The current stack not necessarily has correlation
1054 // for where the type was defined. On the other
1055 // hand, `paths` always has the right
1056 // information if present.
1057 Some(&(ref fqp, ItemType::Trait)) |
1058 Some(&(ref fqp, ItemType::Struct)) |
1059 Some(&(ref fqp, ItemType::Union)) |
1060 Some(&(ref fqp, ItemType::Enum)) =>
1061 Some(&fqp[..fqp.len() - 1]),
1062 Some(..) => Some(&*self.stack),
1065 ((Some(*last), path), true)
1068 _ => ((None, Some(&*self.stack)), false)
1072 (parent, Some(path)) if is_inherent_impl_item || (!self.stripped_mod) => {
1073 debug_assert!(!item.is_stripped());
1075 // A crate has a module at its root, containing all items,
1076 // which should not be indexed. The crate-item itself is
1077 // inserted later on when serializing the search-index.
1078 if item.def_id.index != CRATE_DEF_INDEX {
1079 self.search_index.push(IndexItem {
1080 ty: item_type(&item),
1081 name: s.to_string(),
1082 path: path.join("::").to_string(),
1083 desc: Escape(&shorter(item.doc_value())).to_string(),
1086 search_type: get_index_search_type(&item),
1090 (Some(parent), None) if is_inherent_impl_item => {
1091 // We have a parent, but we don't know where they're
1092 // defined yet. Wait for later to index this item.
1093 self.orphan_impl_items.push((parent, item.clone()));
1099 // Keep track of the fully qualified path for this item.
1100 let pushed = match item.name {
1101 Some(ref n) if !n.is_empty() => {
1102 self.stack.push(n.to_string());
1109 clean::StructItem(..) | clean::EnumItem(..) |
1110 clean::TypedefItem(..) | clean::TraitItem(..) |
1111 clean::FunctionItem(..) | clean::ModuleItem(..) |
1112 clean::ForeignFunctionItem(..) | clean::ForeignStaticItem(..) |
1113 clean::ConstantItem(..) | clean::StaticItem(..) |
1114 clean::UnionItem(..)
1115 if !self.stripped_mod => {
1116 // Reexported items mean that the same id can show up twice
1117 // in the rustdoc ast that we're looking at. We know,
1118 // however, that a reexported item doesn't show up in the
1119 // `public_items` map, so we can skip inserting into the
1120 // paths map if there was already an entry present and we're
1121 // not a public item.
1123 !self.paths.contains_key(&item.def_id) ||
1124 self.access_levels.is_public(item.def_id)
1126 self.paths.insert(item.def_id,
1127 (self.stack.clone(), item_type(&item)));
1130 // link variants to their parent enum because pages aren't emitted
1132 clean::VariantItem(..) if !self.stripped_mod => {
1133 let mut stack = self.stack.clone();
1135 self.paths.insert(item.def_id, (stack, ItemType::Enum));
1138 clean::PrimitiveItem(..) if item.visibility.is_some() => {
1139 self.paths.insert(item.def_id, (self.stack.clone(),
1146 // Maintain the parent stack
1147 let orig_parent_is_trait_impl = self.parent_is_trait_impl;
1148 let parent_pushed = match item.inner {
1149 clean::TraitItem(..) | clean::EnumItem(..) |
1150 clean::StructItem(..) | clean::UnionItem(..) => {
1151 self.parent_stack.push(item.def_id);
1152 self.parent_is_trait_impl = false;
1155 clean::ImplItem(ref i) => {
1156 self.parent_is_trait_impl = i.trait_.is_some();
1158 clean::ResolvedPath{ did, .. } => {
1159 self.parent_stack.push(did);
1163 match t.primitive_type() {
1165 let did = DefId::local(prim.to_def_index());
1166 self.parent_stack.push(did);
1177 // Once we've recursively found all the generics, then hoard off all the
1178 // implementations elsewhere
1179 let ret = self.fold_item_recur(item).and_then(|item| {
1180 if let clean::Item { inner: clean::ImplItem(_), .. } = item {
1181 // Figure out the id of this impl. This may map to a
1182 // primitive rather than always to a struct/enum.
1183 // Note: matching twice to restrict the lifetime of the `i` borrow.
1184 let did = if let clean::Item { inner: clean::ImplItem(ref i), .. } = item {
1186 clean::ResolvedPath { did, .. } |
1187 clean::BorrowedRef {
1188 type_: box clean::ResolvedPath { did, .. }, ..
1193 t.primitive_type().and_then(|t| {
1194 self.primitive_locations.get(&t).map(|n| {
1195 let id = t.to_def_index();
1196 DefId { krate: *n, index: id }
1205 if let Some(did) = did {
1206 self.impls.entry(did).or_insert(vec![]).push(Impl {
1217 if pushed { self.stack.pop().unwrap(); }
1218 if parent_pushed { self.parent_stack.pop().unwrap(); }
1219 self.seen_mod = orig_seen_mod;
1220 self.stripped_mod = orig_stripped_mod;
1221 self.parent_is_trait_impl = orig_parent_is_trait_impl;
1227 fn generics(&mut self, generics: &clean::Generics) {
1228 for typ in &generics.type_params {
1229 self.typarams.insert(typ.did, typ.name.clone());
1235 /// Recurse in the directory structure and change the "root path" to make
1236 /// sure it always points to the top (relatively)
1237 fn recurse<T, F>(&mut self, s: String, f: F) -> T where
1238 F: FnOnce(&mut Context) -> T,
1241 panic!("Unexpected empty destination: {:?}", self.current);
1243 let prev = self.dst.clone();
1245 self.root_path.push_str("../");
1246 self.current.push(s);
1248 info!("Recursing into {}", self.dst.display());
1252 info!("Recursed; leaving {}", self.dst.display());
1254 // Go back to where we were at
1256 let len = self.root_path.len();
1257 self.root_path.truncate(len - 3);
1258 self.current.pop().unwrap();
1263 /// Main method for rendering a crate.
1265 /// This currently isn't parallelized, but it'd be pretty easy to add
1266 /// parallelization to this function.
1267 fn krate(self, mut krate: clean::Crate) -> Result<(), Error> {
1268 let mut item = match krate.module.take() {
1270 None => return Ok(())
1272 item.name = Some(krate.name);
1274 // render the crate documentation
1275 let mut work = vec!((self, item));
1277 while let Some((mut cx, item)) = work.pop() {
1278 cx.item(item, |cx, item| {
1279 work.push((cx.clone(), item))
1285 fn render_item(&self,
1286 writer: &mut io::Write,
1290 // A little unfortunate that this is done like this, but it sure
1291 // does make formatting *a lot* nicer.
1292 CURRENT_LOCATION_KEY.with(|slot| {
1293 *slot.borrow_mut() = self.current.clone();
1296 let mut title = if it.is_primitive() {
1297 // No need to include the namespace for primitive types
1300 self.current.join("::")
1303 if !title.is_empty() {
1304 title.push_str("::");
1306 title.push_str(it.name.as_ref().unwrap());
1308 title.push_str(" - Rust");
1309 let tyname = item_type(it).css_class();
1310 let desc = if it.is_crate() {
1311 format!("API documentation for the Rust `{}` crate.",
1312 self.shared.layout.krate)
1314 format!("API documentation for the Rust `{}` {} in crate `{}`.",
1315 it.name.as_ref().unwrap(), tyname, self.shared.layout.krate)
1317 let keywords = make_item_keywords(it);
1318 let page = layout::Page {
1320 root_path: &self.root_path,
1323 keywords: &keywords,
1328 if !self.render_redirect_pages {
1329 layout::render(writer, &self.shared.layout, &page,
1330 &Sidebar{ cx: self, item: it },
1331 &Item{ cx: self, item: it },
1332 self.shared.css_file_extension.is_some())?;
1334 let mut url = repeat("../").take(self.current.len())
1335 .collect::<String>();
1336 if let Some(&(ref names, ty)) = cache().paths.get(&it.def_id) {
1337 for name in &names[..names.len() - 1] {
1341 url.push_str(&item_path(ty, names.last().unwrap()));
1342 layout::redirect(writer, &url)?;
1348 /// Non-parallelized version of rendering an item. This will take the input
1349 /// item, render its contents, and then invoke the specified closure with
1350 /// all sub-items which need to be rendered.
1352 /// The rendering driver uses this closure to queue up more work.
1353 fn item<F>(&mut self, item: clean::Item, mut f: F) -> Result<(), Error> where
1354 F: FnMut(&mut Context, clean::Item),
1356 // Stripped modules survive the rustdoc passes (i.e. `strip-private`)
1357 // if they contain impls for public types. These modules can also
1358 // contain items such as publicly reexported structures.
1360 // External crates will provide links to these structures, so
1361 // these modules are recursed into, but not rendered normally
1362 // (a flag on the context).
1363 if !self.render_redirect_pages {
1364 self.render_redirect_pages = maybe_ignore_item(&item);
1368 // modules are special because they add a namespace. We also need to
1369 // recurse into the items of the module as well.
1370 let name = item.name.as_ref().unwrap().to_string();
1371 let mut item = Some(item);
1372 self.recurse(name, |this| {
1373 let item = item.take().unwrap();
1375 let mut buf = Vec::new();
1376 this.render_item(&mut buf, &item, false).unwrap();
1377 // buf will be empty if the module is stripped and there is no redirect for it
1378 if !buf.is_empty() {
1379 let joint_dst = this.dst.join("index.html");
1380 try_err!(fs::create_dir_all(&this.dst), &this.dst);
1381 let mut dst = try_err!(File::create(&joint_dst), &joint_dst);
1382 try_err!(dst.write_all(&buf), &joint_dst);
1385 let m = match item.inner {
1386 clean::StrippedItem(box clean::ModuleItem(m)) |
1387 clean::ModuleItem(m) => m,
1391 // Render sidebar-items.js used throughout this module.
1392 if !this.render_redirect_pages {
1393 let items = this.build_sidebar_items(&m);
1394 let js_dst = this.dst.join("sidebar-items.js");
1395 let mut js_out = BufWriter::new(try_err!(File::create(&js_dst), &js_dst));
1396 try_err!(write!(&mut js_out, "initSidebarItems({});",
1397 as_json(&items)), &js_dst);
1400 for item in m.items {
1406 } else if item.name.is_some() {
1407 let mut buf = Vec::new();
1408 self.render_item(&mut buf, &item, true).unwrap();
1409 // buf will be empty if the item is stripped and there is no redirect for it
1410 if !buf.is_empty() {
1411 let name = item.name.as_ref().unwrap();
1412 let item_type = item_type(&item);
1413 let file_name = &item_path(item_type, name);
1414 let joint_dst = self.dst.join(file_name);
1415 try_err!(fs::create_dir_all(&self.dst), &self.dst);
1416 let mut dst = try_err!(File::create(&joint_dst), &joint_dst);
1417 try_err!(dst.write_all(&buf), &joint_dst);
1419 // Redirect from a sane URL using the namespace to Rustdoc's
1420 // URL for the page.
1421 let redir_name = format!("{}.{}.html", name, item_type.name_space());
1422 let redir_dst = self.dst.join(redir_name);
1423 if let Ok(mut redirect_out) = OpenOptions::new().create_new(true)
1426 try_err!(layout::redirect(&mut redirect_out, file_name), &redir_dst);
1429 // If the item is a macro, redirect from the old macro URL (with !)
1430 // to the new one (without).
1431 // FIXME(#35705) remove this redirect.
1432 if item_type == ItemType::Macro {
1433 let redir_name = format!("{}.{}!.html", item_type, name);
1434 let redir_dst = self.dst.join(redir_name);
1435 let mut redirect_out = try_err!(File::create(&redir_dst), &redir_dst);
1436 try_err!(layout::redirect(&mut redirect_out, file_name), &redir_dst);
1443 fn build_sidebar_items(&self, m: &clean::Module) -> BTreeMap<String, Vec<NameDoc>> {
1444 // BTreeMap instead of HashMap to get a sorted output
1445 let mut map = BTreeMap::new();
1446 for item in &m.items {
1447 if maybe_ignore_item(item) { continue }
1449 let short = item_type(item).css_class();
1450 let myname = match item.name {
1452 Some(ref s) => s.to_string(),
1454 let short = short.to_string();
1455 map.entry(short).or_insert(vec![])
1456 .push((myname, Some(plain_summary_line(item.doc_value()))));
1459 for (_, items) in &mut map {
1467 /// Generate a url appropriate for an `href` attribute back to the source of
1470 /// The url generated, when clicked, will redirect the browser back to the
1471 /// original source code.
1473 /// If `None` is returned, then a source link couldn't be generated. This
1474 /// may happen, for example, with externally inlined items where the source
1475 /// of their crate documentation isn't known.
1476 fn href(&self) -> Option<String> {
1477 let href = if self.item.source.loline == self.item.source.hiline {
1478 format!("{}", self.item.source.loline)
1480 format!("{}-{}", self.item.source.loline, self.item.source.hiline)
1483 // First check to see if this is an imported macro source. In this case
1484 // we need to handle it specially as cross-crate inlined macros have...
1486 let imported_macro_from = match self.item.inner {
1487 clean::MacroItem(ref m) => m.imported_from.as_ref(),
1490 if let Some(krate) = imported_macro_from {
1491 let cache = cache();
1492 let root = cache.extern_locations.values().find(|&&(ref n, _)| {
1495 let root = match root {
1496 Some(&Remote(ref s)) => s.to_string(),
1497 Some(&Local) => self.cx.root_path.clone(),
1498 None | Some(&Unknown) => return None,
1500 Some(format!("{root}/{krate}/macro.{name}.html?gotomacrosrc=1",
1503 name = self.item.name.as_ref().unwrap()))
1505 // If this item is part of the local crate, then we're guaranteed to
1506 // know the span, so we plow forward and generate a proper url. The url
1507 // has anchors for the line numbers that we're linking to.
1508 } else if self.item.def_id.is_local() {
1509 let path = PathBuf::from(&self.item.source.filename);
1510 self.cx.shared.local_sources.get(&path).map(|path| {
1511 format!("{root}src/{krate}/{path}#{href}",
1512 root = self.cx.root_path,
1513 krate = self.cx.shared.layout.krate,
1517 // If this item is not part of the local crate, then things get a little
1518 // trickier. We don't actually know the span of the external item, but
1519 // we know that the documentation on the other end knows the span!
1521 // In this case, we generate a link to the *documentation* for this type
1522 // in the original crate. There's an extra URL parameter which says that
1523 // we want to go somewhere else, and the JS on the destination page will
1524 // pick it up and instantly redirect the browser to the source code.
1526 // If we don't know where the external documentation for this crate is
1527 // located, then we return `None`.
1529 let cache = cache();
1530 let external_path = match cache.external_paths.get(&self.item.def_id) {
1531 Some(&(ref path, _)) => path,
1532 None => return None,
1534 let mut path = match cache.extern_locations.get(&self.item.def_id.krate) {
1535 Some(&(_, Remote(ref s))) => s.to_string(),
1536 Some(&(_, Local)) => self.cx.root_path.clone(),
1537 Some(&(_, Unknown)) => return None,
1538 None => return None,
1540 for item in &external_path[..external_path.len() - 1] {
1541 path.push_str(item);
1544 Some(format!("{path}{file}?gotosrc={goto}",
1546 file = item_path(item_type(self.item), external_path.last().unwrap()),
1547 goto = self.item.def_id.index.as_usize()))
1552 impl<'a> fmt::Display for Item<'a> {
1553 fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
1554 debug_assert!(!self.item.is_stripped());
1555 // Write the breadcrumb trail header for the top
1556 write!(fmt, "\n<h1 class='fqn'><span class='in-band'>")?;
1557 match self.item.inner {
1558 clean::ModuleItem(ref m) => if m.is_crate {
1559 write!(fmt, "Crate ")?;
1561 write!(fmt, "Module ")?;
1563 clean::FunctionItem(..) => write!(fmt, "Function ")?,
1564 clean::TraitItem(..) => write!(fmt, "Trait ")?,
1565 clean::StructItem(..) => write!(fmt, "Struct ")?,
1566 clean::UnionItem(..) => write!(fmt, "Union ")?,
1567 clean::EnumItem(..) => write!(fmt, "Enum ")?,
1568 clean::PrimitiveItem(..) => write!(fmt, "Primitive Type ")?,
1571 if !self.item.is_primitive() {
1572 let cur = &self.cx.current;
1573 let amt = if self.item.is_mod() { cur.len() - 1 } else { cur.len() };
1574 for (i, component) in cur.iter().enumerate().take(amt) {
1575 write!(fmt, "<a href='{}index.html'>{}</a>::<wbr>",
1576 repeat("../").take(cur.len() - i - 1)
1577 .collect::<String>(),
1581 write!(fmt, "<a class='{}' href=''>{}</a>",
1582 item_type(self.item), self.item.name.as_ref().unwrap())?;
1584 write!(fmt, "</span>")?; // in-band
1585 write!(fmt, "<span class='out-of-band'>")?;
1586 if let Some(version) = self.item.stable_since() {
1587 write!(fmt, "<span class='since' title='Stable since Rust version {0}'>{0}</span>",
1591 r##"<span id='render-detail'>
1592 <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
1593 [<span class='inner'>−</span>]
1599 // When this item is part of a `pub use` in a downstream crate, the
1600 // [src] link in the downstream documentation will actually come back to
1601 // this page, and this link will be auto-clicked. The `id` attribute is
1602 // used to find the link to auto-click.
1603 if self.cx.shared.include_sources && !self.item.is_primitive() {
1604 if let Some(l) = self.href() {
1605 write!(fmt, "<a id='src-{}' class='srclink' \
1606 href='{}' title='{}'>[src]</a>",
1607 self.item.def_id.index.as_usize(), l, "goto source code")?;
1611 write!(fmt, "</span>")?; // out-of-band
1613 write!(fmt, "</h1>\n")?;
1615 match self.item.inner {
1616 clean::ModuleItem(ref m) => {
1617 item_module(fmt, self.cx, self.item, &m.items)
1619 clean::FunctionItem(ref f) | clean::ForeignFunctionItem(ref f) =>
1620 item_function(fmt, self.cx, self.item, f),
1621 clean::TraitItem(ref t) => item_trait(fmt, self.cx, self.item, t),
1622 clean::StructItem(ref s) => item_struct(fmt, self.cx, self.item, s),
1623 clean::UnionItem(ref s) => item_union(fmt, self.cx, self.item, s),
1624 clean::EnumItem(ref e) => item_enum(fmt, self.cx, self.item, e),
1625 clean::TypedefItem(ref t, _) => item_typedef(fmt, self.cx, self.item, t),
1626 clean::MacroItem(ref m) => item_macro(fmt, self.cx, self.item, m),
1627 clean::PrimitiveItem(ref p) => item_primitive(fmt, self.cx, self.item, p),
1628 clean::StaticItem(ref i) | clean::ForeignStaticItem(ref i) =>
1629 item_static(fmt, self.cx, self.item, i),
1630 clean::ConstantItem(ref c) => item_constant(fmt, self.cx, self.item, c),
1636 fn item_path(ty: ItemType, name: &str) -> String {
1638 ItemType::Module => format!("{}/index.html", name),
1639 _ => format!("{}.{}.html", ty.css_class(), name),
1643 fn full_path(cx: &Context, item: &clean::Item) -> String {
1644 let mut s = cx.current.join("::");
1646 s.push_str(item.name.as_ref().unwrap());
1650 fn shorter<'a>(s: Option<&'a str>) -> String {
1652 Some(s) => s.lines().take_while(|line|{
1653 (*line).chars().any(|chr|{
1654 !chr.is_whitespace()
1656 }).collect::<Vec<_>>().join("\n"),
1657 None => "".to_string()
1662 fn plain_summary_line(s: Option<&str>) -> String {
1663 let line = shorter(s).replace("\n", " ");
1664 markdown::plain_summary_line(&line[..])
1667 fn document(w: &mut fmt::Formatter, cx: &Context, item: &clean::Item) -> fmt::Result {
1668 document_stability(w, cx, item)?;
1669 document_full(w, item)?;
1673 fn document_short(w: &mut fmt::Formatter, item: &clean::Item, link: AssocItemLink) -> fmt::Result {
1674 if let Some(s) = item.doc_value() {
1675 let markdown = if s.contains('\n') {
1676 format!("{} [Read more]({})",
1677 &plain_summary_line(Some(s)), naive_assoc_href(item, link))
1679 format!("{}", &plain_summary_line(Some(s)))
1681 write!(w, "<div class='docblock'>{}</div>", Markdown(&markdown))?;
1686 fn document_full(w: &mut fmt::Formatter, item: &clean::Item) -> fmt::Result {
1687 if let Some(s) = item.doc_value() {
1688 write!(w, "<div class='docblock'>{}</div>", Markdown(s))?;
1693 fn document_stability(w: &mut fmt::Formatter, cx: &Context, item: &clean::Item) -> fmt::Result {
1694 for stability in short_stability(item, cx, true) {
1695 write!(w, "<div class='stability'>{}</div>", stability)?;
1700 fn item_module(w: &mut fmt::Formatter, cx: &Context,
1701 item: &clean::Item, items: &[clean::Item]) -> fmt::Result {
1702 document(w, cx, item)?;
1704 let mut indices = (0..items.len()).filter(|i| {
1705 if let clean::DefaultImplItem(..) = items[*i].inner {
1708 !maybe_ignore_item(&items[*i])
1709 }).collect::<Vec<usize>>();
1711 // the order of item types in the listing
1712 fn reorder(ty: ItemType) -> u8 {
1714 ItemType::ExternCrate => 0,
1715 ItemType::Import => 1,
1716 ItemType::Primitive => 2,
1717 ItemType::Module => 3,
1718 ItemType::Macro => 4,
1719 ItemType::Struct => 5,
1720 ItemType::Enum => 6,
1721 ItemType::Constant => 7,
1722 ItemType::Static => 8,
1723 ItemType::Trait => 9,
1724 ItemType::Function => 10,
1725 ItemType::Typedef => 12,
1726 ItemType::Union => 13,
1731 fn cmp(i1: &clean::Item, i2: &clean::Item, idx1: usize, idx2: usize) -> Ordering {
1732 let ty1 = item_type(i1);
1733 let ty2 = item_type(i2);
1735 return (reorder(ty1), idx1).cmp(&(reorder(ty2), idx2))
1737 let s1 = i1.stability.as_ref().map(|s| s.level);
1738 let s2 = i2.stability.as_ref().map(|s| s.level);
1740 (Some(stability::Unstable), Some(stability::Stable)) => return Ordering::Greater,
1741 (Some(stability::Stable), Some(stability::Unstable)) => return Ordering::Less,
1744 i1.name.cmp(&i2.name)
1747 indices.sort_by(|&i1, &i2| cmp(&items[i1], &items[i2], i1, i2));
1749 debug!("{:?}", indices);
1750 let mut curty = None;
1751 for &idx in &indices {
1752 let myitem = &items[idx];
1753 if myitem.is_stripped() {
1757 let myty = Some(item_type(myitem));
1758 if curty == Some(ItemType::ExternCrate) && myty == Some(ItemType::Import) {
1759 // Put `extern crate` and `use` re-exports in the same section.
1761 } else if myty != curty {
1762 if curty.is_some() {
1763 write!(w, "</table>")?;
1766 let (short, name) = match myty.unwrap() {
1767 ItemType::ExternCrate |
1768 ItemType::Import => ("reexports", "Reexports"),
1769 ItemType::Module => ("modules", "Modules"),
1770 ItemType::Struct => ("structs", "Structs"),
1771 ItemType::Union => ("unions", "Unions"),
1772 ItemType::Enum => ("enums", "Enums"),
1773 ItemType::Function => ("functions", "Functions"),
1774 ItemType::Typedef => ("types", "Type Definitions"),
1775 ItemType::Static => ("statics", "Statics"),
1776 ItemType::Constant => ("constants", "Constants"),
1777 ItemType::Trait => ("traits", "Traits"),
1778 ItemType::Impl => ("impls", "Implementations"),
1779 ItemType::TyMethod => ("tymethods", "Type Methods"),
1780 ItemType::Method => ("methods", "Methods"),
1781 ItemType::StructField => ("fields", "Struct Fields"),
1782 ItemType::Variant => ("variants", "Variants"),
1783 ItemType::Macro => ("macros", "Macros"),
1784 ItemType::Primitive => ("primitives", "Primitive Types"),
1785 ItemType::AssociatedType => ("associated-types", "Associated Types"),
1786 ItemType::AssociatedConst => ("associated-consts", "Associated Constants"),
1788 write!(w, "<h2 id='{id}' class='section-header'>\
1789 <a href=\"#{id}\">{name}</a></h2>\n<table>",
1790 id = derive_id(short.to_owned()), name = name)?;
1793 match myitem.inner {
1794 clean::ExternCrateItem(ref name, ref src) => {
1795 use html::format::HRef;
1799 write!(w, "<tr><td><code>{}extern crate {} as {};",
1800 VisSpace(&myitem.visibility),
1801 HRef::new(myitem.def_id, src),
1805 write!(w, "<tr><td><code>{}extern crate {};",
1806 VisSpace(&myitem.visibility),
1807 HRef::new(myitem.def_id, name))?
1810 write!(w, "</code></td></tr>")?;
1813 clean::ImportItem(ref import) => {
1814 write!(w, "<tr><td><code>{}{}</code></td></tr>",
1815 VisSpace(&myitem.visibility), *import)?;
1819 if myitem.name.is_none() { continue }
1821 let stabilities = short_stability(myitem, cx, false);
1823 let stab_docs = if !stabilities.is_empty() {
1825 .map(|s| format!("[{}]", s))
1826 .collect::<Vec<_>>()
1832 let doc_value = myitem.doc_value().unwrap_or("");
1834 <tr class='{stab} module-item'>
1835 <td><a class='{class}' href='{href}'
1836 title='{title}'>{name}</a></td>
1837 <td class='docblock short'>
1841 name = *myitem.name.as_ref().unwrap(),
1842 stab_docs = stab_docs,
1843 docs = shorter(Some(&Markdown(doc_value).to_string())),
1844 class = item_type(myitem),
1845 stab = myitem.stability_class(),
1846 href = item_path(item_type(myitem), myitem.name.as_ref().unwrap()),
1847 title = full_path(cx, myitem))?;
1852 if curty.is_some() {
1853 write!(w, "</table>")?;
1858 fn maybe_ignore_item(it: &clean::Item) -> bool {
1860 clean::StrippedItem(..) => true,
1861 clean::ModuleItem(ref m) => {
1862 it.doc_value().is_none() && m.items.is_empty()
1863 && it.visibility != Some(clean::Public)
1869 fn short_stability(item: &clean::Item, cx: &Context, show_reason: bool) -> Vec<String> {
1870 let mut stability = vec![];
1872 if let Some(stab) = item.stability.as_ref() {
1873 let reason = if show_reason && !stab.reason.is_empty() {
1874 format!(": {}", stab.reason)
1878 if !stab.deprecated_since.is_empty() {
1879 let since = if show_reason {
1880 format!(" since {}", Escape(&stab.deprecated_since))
1884 let text = format!("Deprecated{}{}", since, Markdown(&reason));
1885 stability.push(format!("<em class='stab deprecated'>{}</em>", text))
1888 if stab.level == stability::Unstable {
1889 let unstable_extra = if show_reason {
1890 match (!stab.feature.is_empty(), &cx.shared.issue_tracker_base_url, stab.issue) {
1891 (true, &Some(ref tracker_url), Some(issue_no)) if issue_no > 0 =>
1892 format!(" (<code>{}</code> <a href=\"{}{}\">#{}</a>)",
1893 Escape(&stab.feature), tracker_url, issue_no, issue_no),
1894 (false, &Some(ref tracker_url), Some(issue_no)) if issue_no > 0 =>
1895 format!(" (<a href=\"{}{}\">#{}</a>)", Escape(&tracker_url), issue_no,
1898 format!(" (<code>{}</code>)", Escape(&stab.feature)),
1904 let text = format!("Unstable{}{}", unstable_extra, Markdown(&reason));
1905 stability.push(format!("<em class='stab unstable'>{}</em>", text))
1907 } else if let Some(depr) = item.deprecation.as_ref() {
1908 let note = if show_reason && !depr.note.is_empty() {
1909 format!(": {}", depr.note)
1913 let since = if show_reason && !depr.since.is_empty() {
1914 format!(" since {}", Escape(&depr.since))
1919 let text = format!("Deprecated{}{}", since, Markdown(¬e));
1920 stability.push(format!("<em class='stab deprecated'>{}</em>", text))
1926 struct Initializer<'a>(&'a str);
1928 impl<'a> fmt::Display for Initializer<'a> {
1929 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1930 let Initializer(s) = *self;
1931 if s.is_empty() { return Ok(()); }
1932 write!(f, "<code> = </code>")?;
1933 write!(f, "<code>{}</code>", Escape(s))
1937 fn item_constant(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
1938 c: &clean::Constant) -> fmt::Result {
1939 write!(w, "<pre class='rust const'>{vis}const \
1940 {name}: {typ}{init}</pre>",
1941 vis = VisSpace(&it.visibility),
1942 name = it.name.as_ref().unwrap(),
1944 init = Initializer(&c.expr))?;
1948 fn item_static(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
1949 s: &clean::Static) -> fmt::Result {
1950 write!(w, "<pre class='rust static'>{vis}static {mutability}\
1951 {name}: {typ}{init}</pre>",
1952 vis = VisSpace(&it.visibility),
1953 mutability = MutableSpace(s.mutability),
1954 name = it.name.as_ref().unwrap(),
1956 init = Initializer(&s.expr))?;
1960 fn item_function(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
1961 f: &clean::Function) -> fmt::Result {
1962 // FIXME(#24111): remove when `const_fn` is stabilized
1963 let vis_constness = match get_unstable_features_setting() {
1964 UnstableFeatures::Allow => f.constness,
1965 _ => hir::Constness::NotConst
1967 write!(w, "<pre class='rust fn'>{vis}{constness}{unsafety}{abi}fn \
1968 {name}{generics}{decl}{where_clause}</pre>",
1969 vis = VisSpace(&it.visibility),
1970 constness = ConstnessSpace(vis_constness),
1971 unsafety = UnsafetySpace(f.unsafety),
1972 abi = AbiSpace(f.abi),
1973 name = it.name.as_ref().unwrap(),
1974 generics = f.generics,
1975 where_clause = WhereClause(&f.generics),
1980 fn item_trait(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
1981 t: &clean::Trait) -> fmt::Result {
1982 let mut bounds = String::new();
1983 if !t.bounds.is_empty() {
1984 if !bounds.is_empty() {
1987 bounds.push_str(": ");
1988 for (i, p) in t.bounds.iter().enumerate() {
1989 if i > 0 { bounds.push_str(" + "); }
1990 bounds.push_str(&format!("{}", *p));
1994 // Output the trait definition
1995 write!(w, "<pre class='rust trait'>{}{}trait {}{}{}{} ",
1996 VisSpace(&it.visibility),
1997 UnsafetySpace(t.unsafety),
1998 it.name.as_ref().unwrap(),
2001 WhereClause(&t.generics))?;
2003 let types = t.items.iter().filter(|m| m.is_associated_type()).collect::<Vec<_>>();
2004 let consts = t.items.iter().filter(|m| m.is_associated_const()).collect::<Vec<_>>();
2005 let required = t.items.iter().filter(|m| m.is_ty_method()).collect::<Vec<_>>();
2006 let provided = t.items.iter().filter(|m| m.is_method()).collect::<Vec<_>>();
2008 if t.items.is_empty() {
2009 write!(w, "{{ }}")?;
2011 // FIXME: we should be using a derived_id for the Anchors here
2015 render_assoc_item(w, t, AssocItemLink::Anchor(None))?;
2018 if !types.is_empty() && !consts.is_empty() {
2023 render_assoc_item(w, t, AssocItemLink::Anchor(None))?;
2026 if !consts.is_empty() && !required.is_empty() {
2029 for m in &required {
2031 render_assoc_item(w, m, AssocItemLink::Anchor(None))?;
2034 if !required.is_empty() && !provided.is_empty() {
2037 for m in &provided {
2039 render_assoc_item(w, m, AssocItemLink::Anchor(None))?;
2040 write!(w, " {{ ... }}\n")?;
2044 write!(w, "</pre>")?;
2046 // Trait documentation
2047 document(w, cx, it)?;
2049 fn trait_item(w: &mut fmt::Formatter, cx: &Context, m: &clean::Item, t: &clean::Item)
2051 let name = m.name.as_ref().unwrap();
2052 let item_type = item_type(m);
2053 let id = derive_id(format!("{}.{}", item_type, name));
2054 let ns_id = derive_id(format!("{}.{}", name, item_type.name_space()));
2055 write!(w, "<h3 id='{id}' class='method stab {stab}'>\
2056 <span id='{ns_id}' class='invisible'><code>",
2058 stab = m.stability_class(),
2060 render_assoc_item(w, m, AssocItemLink::Anchor(Some(&id)))?;
2061 write!(w, "</code>")?;
2062 render_stability_since(w, m, t)?;
2063 write!(w, "</span></h3>")?;
2064 document(w, cx, m)?;
2068 if !types.is_empty() {
2070 <h2 id='associated-types'>Associated Types</h2>
2071 <div class='methods'>
2074 trait_item(w, cx, *t, it)?;
2076 write!(w, "</div>")?;
2079 if !consts.is_empty() {
2081 <h2 id='associated-const'>Associated Constants</h2>
2082 <div class='methods'>
2085 trait_item(w, cx, *t, it)?;
2087 write!(w, "</div>")?;
2090 // Output the documentation for each function individually
2091 if !required.is_empty() {
2093 <h2 id='required-methods'>Required Methods</h2>
2094 <div class='methods'>
2096 for m in &required {
2097 trait_item(w, cx, *m, it)?;
2099 write!(w, "</div>")?;
2101 if !provided.is_empty() {
2103 <h2 id='provided-methods'>Provided Methods</h2>
2104 <div class='methods'>
2106 for m in &provided {
2107 trait_item(w, cx, *m, it)?;
2109 write!(w, "</div>")?;
2112 // If there are methods directly on this trait object, render them here.
2113 render_assoc_items(w, cx, it, it.def_id, AssocItemRender::All)?;
2115 let cache = cache();
2117 <h2 id='implementors'>Implementors</h2>
2118 <ul class='item-list' id='implementors-list'>
2120 if let Some(implementors) = cache.implementors.get(&it.def_id) {
2121 for i in implementors {
2122 write!(w, "<li><code>")?;
2123 fmt_impl_for_trait_page(&i.impl_, w)?;
2124 writeln!(w, "</code></li>")?;
2127 write!(w, "</ul>")?;
2128 write!(w, r#"<script type="text/javascript" async
2129 src="{root_path}/implementors/{path}/{ty}.{name}.js">
2131 root_path = vec![".."; cx.current.len()].join("/"),
2132 path = if it.def_id.is_local() {
2133 cx.current.join("/")
2135 let (ref path, _) = cache.external_paths[&it.def_id];
2136 path[..path.len() - 1].join("/")
2138 ty = item_type(it).css_class(),
2139 name = *it.name.as_ref().unwrap())?;
2143 fn naive_assoc_href(it: &clean::Item, link: AssocItemLink) -> String {
2144 use html::item_type::ItemType::*;
2146 let name = it.name.as_ref().unwrap();
2147 let ty = match item_type(it) {
2148 Typedef | AssociatedType => AssociatedType,
2152 let anchor = format!("#{}.{}", ty, name);
2154 AssocItemLink::Anchor(Some(ref id)) => format!("#{}", id),
2155 AssocItemLink::Anchor(None) => anchor,
2156 AssocItemLink::GotoSource(did, _) => {
2157 href(did).map(|p| format!("{}{}", p.0, anchor)).unwrap_or(anchor)
2162 fn assoc_const(w: &mut fmt::Formatter,
2165 default: Option<&String>,
2166 link: AssocItemLink) -> fmt::Result {
2167 write!(w, "const <a href='{}' class='constant'>{}</a>",
2168 naive_assoc_href(it, link),
2169 it.name.as_ref().unwrap())?;
2171 write!(w, ": {}", ty)?;
2172 if let Some(default) = default {
2173 write!(w, " = {}", Escape(default))?;
2178 fn assoc_type(w: &mut fmt::Formatter, it: &clean::Item,
2179 bounds: &Vec<clean::TyParamBound>,
2180 default: Option<&clean::Type>,
2181 link: AssocItemLink) -> fmt::Result {
2182 write!(w, "type <a href='{}' class='type'>{}</a>",
2183 naive_assoc_href(it, link),
2184 it.name.as_ref().unwrap())?;
2185 if !bounds.is_empty() {
2186 write!(w, ": {}", TyParamBounds(bounds))?
2188 if let Some(default) = default {
2189 write!(w, " = {}", default)?;
2194 fn render_stability_since_raw<'a>(w: &mut fmt::Formatter,
2195 ver: Option<&'a str>,
2196 containing_ver: Option<&'a str>) -> fmt::Result {
2197 if let Some(v) = ver {
2198 if containing_ver != ver && v.len() > 0 {
2199 write!(w, "<div class='since' title='Stable since Rust version {0}'>{0}</div>",
2206 fn render_stability_since(w: &mut fmt::Formatter,
2208 containing_item: &clean::Item) -> fmt::Result {
2209 render_stability_since_raw(w, item.stable_since(), containing_item.stable_since())
2212 fn render_assoc_item(w: &mut fmt::Formatter,
2214 link: AssocItemLink) -> fmt::Result {
2215 fn method(w: &mut fmt::Formatter,
2217 unsafety: hir::Unsafety,
2218 constness: hir::Constness,
2220 g: &clean::Generics,
2222 link: AssocItemLink)
2224 let name = meth.name.as_ref().unwrap();
2225 let anchor = format!("#{}.{}", item_type(meth), name);
2226 let href = match link {
2227 AssocItemLink::Anchor(Some(ref id)) => format!("#{}", id),
2228 AssocItemLink::Anchor(None) => anchor,
2229 AssocItemLink::GotoSource(did, provided_methods) => {
2230 // We're creating a link from an impl-item to the corresponding
2231 // trait-item and need to map the anchored type accordingly.
2232 let ty = if provided_methods.contains(name) {
2238 href(did).map(|p| format!("{}#{}.{}", p.0, ty, name)).unwrap_or(anchor)
2241 // FIXME(#24111): remove when `const_fn` is stabilized
2242 let vis_constness = match get_unstable_features_setting() {
2243 UnstableFeatures::Allow => constness,
2244 _ => hir::Constness::NotConst
2246 write!(w, "{}{}{}fn <a href='{href}' class='fnname'>{name}</a>\
2247 {generics}{decl}{where_clause}",
2248 ConstnessSpace(vis_constness),
2249 UnsafetySpace(unsafety),
2255 where_clause = WhereClause(g))
2258 clean::StrippedItem(..) => Ok(()),
2259 clean::TyMethodItem(ref m) => {
2260 method(w, item, m.unsafety, hir::Constness::NotConst,
2261 m.abi, &m.generics, &m.decl, link)
2263 clean::MethodItem(ref m) => {
2264 method(w, item, m.unsafety, m.constness,
2265 m.abi, &m.generics, &m.decl,
2268 clean::AssociatedConstItem(ref ty, ref default) => {
2269 assoc_const(w, item, ty, default.as_ref(), link)
2271 clean::AssociatedTypeItem(ref bounds, ref default) => {
2272 assoc_type(w, item, bounds, default.as_ref(), link)
2274 _ => panic!("render_assoc_item called on non-associated-item")
2278 fn item_struct(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
2279 s: &clean::Struct) -> fmt::Result {
2280 write!(w, "<pre class='rust struct'>")?;
2281 render_attributes(w, it)?;
2289 write!(w, "</pre>")?;
2291 document(w, cx, it)?;
2292 let mut fields = s.fields.iter().filter_map(|f| {
2294 clean::StructFieldItem(ref ty) => Some((f, ty)),
2298 if let doctree::Plain = s.struct_type {
2299 if fields.peek().is_some() {
2300 write!(w, "<h2 class='fields'>Fields</h2>")?;
2301 for (field, ty) in fields {
2302 let id = derive_id(format!("{}.{}",
2303 ItemType::StructField,
2304 field.name.as_ref().unwrap()));
2305 let ns_id = derive_id(format!("{}.{}",
2306 field.name.as_ref().unwrap(),
2307 ItemType::StructField.name_space()));
2308 write!(w, "<span id='{id}' class='{item_type}'>
2309 <span id='{ns_id}' class='invisible'>
2310 <code>{name}: {ty}</code>
2311 </span></span><span class='stab {stab}'></span>",
2312 item_type = ItemType::StructField,
2315 stab = field.stability_class(),
2316 name = field.name.as_ref().unwrap(),
2318 document(w, cx, field)?;
2322 render_assoc_items(w, cx, it, it.def_id, AssocItemRender::All)
2325 fn item_union(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
2326 s: &clean::Union) -> fmt::Result {
2327 write!(w, "<pre class='rust union'>")?;
2328 render_attributes(w, it)?;
2335 write!(w, "</pre>")?;
2337 document(w, cx, it)?;
2338 let mut fields = s.fields.iter().filter_map(|f| {
2340 clean::StructFieldItem(ref ty) => Some((f, ty)),
2344 if fields.peek().is_some() {
2345 write!(w, "<h2 class='fields'>Fields</h2>")?;
2346 for (field, ty) in fields {
2347 write!(w, "<span id='{shortty}.{name}' class='{shortty}'><code>{name}: {ty}</code>
2348 </span><span class='stab {stab}'></span>",
2349 shortty = ItemType::StructField,
2350 stab = field.stability_class(),
2351 name = field.name.as_ref().unwrap(),
2353 document(w, cx, field)?;
2356 render_assoc_items(w, cx, it, it.def_id, AssocItemRender::All)
2359 fn item_enum(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
2360 e: &clean::Enum) -> fmt::Result {
2361 write!(w, "<pre class='rust enum'>")?;
2362 render_attributes(w, it)?;
2363 write!(w, "{}enum {}{}{}",
2364 VisSpace(&it.visibility),
2365 it.name.as_ref().unwrap(),
2367 WhereClause(&e.generics))?;
2368 if e.variants.is_empty() && !e.variants_stripped {
2369 write!(w, " {{}}")?;
2371 write!(w, " {{\n")?;
2372 for v in &e.variants {
2374 let name = v.name.as_ref().unwrap();
2376 clean::VariantItem(ref var) => {
2378 clean::CLikeVariant => write!(w, "{}", name)?,
2379 clean::TupleVariant(ref tys) => {
2380 write!(w, "{}(", name)?;
2381 for (i, ty) in tys.iter().enumerate() {
2383 write!(w, ", ")?
2385 write!(w, "{}", *ty)?;
2389 clean::StructVariant(ref s) => {
2405 if e.variants_stripped {
2406 write!(w, " // some variants omitted\n")?;
2410 write!(w, "</pre>")?;
2411 render_stability_since_raw(w, it.stable_since(), None)?;
2413 document(w, cx, it)?;
2414 if !e.variants.is_empty() {
2415 write!(w, "<h2 class='variants'>Variants</h2>\n")?;
2416 for variant in &e.variants {
2417 let id = derive_id(format!("{}.{}",
2419 variant.name.as_ref().unwrap()));
2420 let ns_id = derive_id(format!("{}.{}",
2421 variant.name.as_ref().unwrap(),
2422 ItemType::Variant.name_space()));
2423 write!(w, "<span id='{id}' class='variant'>\
2424 <span id='{ns_id}' class='invisible'><code>{name}",
2427 name = variant.name.as_ref().unwrap())?;
2428 if let clean::VariantItem(ref var) = variant.inner {
2429 if let clean::TupleVariant(ref tys) = var.kind {
2431 for (i, ty) in tys.iter().enumerate() {
2433 write!(w, ", ")?;
2435 write!(w, "{}", *ty)?;
2440 write!(w, "</code></span></span>")?;
2441 document(w, cx, variant)?;
2443 use clean::{Variant, StructVariant};
2444 if let clean::VariantItem( Variant { kind: StructVariant(ref s) } ) = variant.inner {
2445 write!(w, "<h3 class='fields'>Fields</h3>\n
2447 for field in &s.fields {
2448 use clean::StructFieldItem;
2449 if let StructFieldItem(ref ty) = field.inner {
2450 let id = derive_id(format!("variant.{}.field.{}",
2451 variant.name.as_ref().unwrap(),
2452 field.name.as_ref().unwrap()));
2453 let ns_id = derive_id(format!("{}.{}.{}.{}",
2454 variant.name.as_ref().unwrap(),
2455 ItemType::Variant.name_space(),
2456 field.name.as_ref().unwrap(),
2457 ItemType::StructField.name_space()));
2458 write!(w, "<tr><td \
2460 <span id='{ns_id}' class='invisible'>\
2461 <code>{f}: {t}</code></span></td><td>",
2464 f = field.name.as_ref().unwrap(),
2466 document(w, cx, field)?;
2467 write!(w, "</td></tr>")?;
2470 write!(w, "</table>")?;
2472 render_stability_since(w, variant, it)?;
2475 render_assoc_items(w, cx, it, it.def_id, AssocItemRender::All)?;
2479 fn render_attributes(w: &mut fmt::Formatter, it: &clean::Item) -> fmt::Result {
2480 for attr in &it.attrs {
2482 clean::Word(ref s) if *s == "must_use" => {
2483 write!(w, "#[{}]\n", s)?;
2485 clean::NameValue(ref k, ref v) if *k == "must_use" => {
2486 write!(w, "#[{} = \"{}\"]\n", k, v)?;
2494 fn render_struct(w: &mut fmt::Formatter, it: &clean::Item,
2495 g: Option<&clean::Generics>,
2496 ty: doctree::StructType,
2497 fields: &[clean::Item],
2499 structhead: bool) -> fmt::Result {
2501 VisSpace(&it.visibility),
2502 if structhead {"struct "} else {""},
2503 it.name.as_ref().unwrap())?;
2504 if let Some(g) = g {
2509 if let Some(g) = g {
2510 write!(w, "{}", WhereClause(g))?
2512 write!(w, " {{\n{}", tab)?;
2513 for field in fields {
2514 if let clean::StructFieldItem(ref ty) = field.inner {
2515 write!(w, " {}{}: {},\n{}",
2516 VisSpace(&field.visibility),
2517 field.name.as_ref().unwrap(),
2523 if it.has_stripped_fields().unwrap() {
2524 write!(w, " // some fields omitted\n{}", tab)?;
2528 doctree::Tuple | doctree::Newtype => {
2530 for (i, field) in fields.iter().enumerate() {
2535 clean::StrippedItem(box clean::StructFieldItem(..)) => {
2538 clean::StructFieldItem(ref ty) => {
2539 write!(w, "{}{}", VisSpace(&field.visibility), *ty)?
2545 if let Some(g) = g {
2546 write!(w, "{}", WhereClause(g))?
2551 // Needed for PhantomData.
2552 if let Some(g) = g {
2553 write!(w, "{}", WhereClause(g))?
2561 fn render_union(w: &mut fmt::Formatter, it: &clean::Item,
2562 g: Option<&clean::Generics>,
2563 fields: &[clean::Item],
2565 structhead: bool) -> fmt::Result {
2567 VisSpace(&it.visibility),
2568 if structhead {"union "} else {""},
2569 it.name.as_ref().unwrap())?;
2570 if let Some(g) = g {
2571 write!(w, "{}", g)?;
2572 write!(w, "{}", WhereClause(g))?;
2575 write!(w, " {{\n{}", tab)?;
2576 for field in fields {
2577 if let clean::StructFieldItem(ref ty) = field.inner {
2578 write!(w, " {}{}: {},\n{}",
2579 VisSpace(&field.visibility),
2580 field.name.as_ref().unwrap(),
2586 if it.has_stripped_fields().unwrap() {
2587 write!(w, " // some fields omitted\n{}", tab)?;
2593 #[derive(Copy, Clone)]
2594 enum AssocItemLink<'a> {
2595 Anchor(Option<&'a str>),
2596 GotoSource(DefId, &'a FnvHashSet<String>),
2599 impl<'a> AssocItemLink<'a> {
2600 fn anchor(&self, id: &'a String) -> Self {
2602 AssocItemLink::Anchor(_) => { AssocItemLink::Anchor(Some(&id)) },
2603 ref other => *other,
2608 enum AssocItemRender<'a> {
2610 DerefFor { trait_: &'a clean::Type, type_: &'a clean::Type, deref_mut_: bool }
2613 #[derive(Copy, Clone, PartialEq)]
2616 ForDeref { mut_: bool },
2619 fn render_assoc_items(w: &mut fmt::Formatter,
2621 containing_item: &clean::Item,
2623 what: AssocItemRender) -> fmt::Result {
2625 let v = match c.impls.get(&it) {
2627 None => return Ok(()),
2629 let (non_trait, traits): (Vec<_>, _) = v.iter().partition(|i| {
2630 i.inner_impl().trait_.is_none()
2632 if !non_trait.is_empty() {
2633 let render_mode = match what {
2634 AssocItemRender::All => {
2635 write!(w, "<h2 id='methods'>Methods</h2>")?;
2638 AssocItemRender::DerefFor { trait_, type_, deref_mut_ } => {
2639 write!(w, "<h2 id='deref-methods'>Methods from \
2640 {}<Target={}></h2>", trait_, type_)?;
2641 RenderMode::ForDeref { mut_: deref_mut_ }
2644 for i in &non_trait {
2645 render_impl(w, cx, i, AssocItemLink::Anchor(None), render_mode,
2646 containing_item.stable_since())?;
2649 if let AssocItemRender::DerefFor { .. } = what {
2652 if !traits.is_empty() {
2653 let deref_impl = traits.iter().find(|t| {
2654 t.inner_impl().trait_.def_id() == c.deref_trait_did
2656 if let Some(impl_) = deref_impl {
2657 let has_deref_mut = traits.iter().find(|t| {
2658 t.inner_impl().trait_.def_id() == c.deref_mut_trait_did
2660 render_deref_methods(w, cx, impl_, containing_item, has_deref_mut)?;
2662 write!(w, "<h2 id='implementations'>Trait \
2663 Implementations</h2>")?;
2665 let did = i.trait_did().unwrap();
2666 let assoc_link = AssocItemLink::GotoSource(did, &i.inner_impl().provided_trait_methods);
2667 render_impl(w, cx, i, assoc_link,
2668 RenderMode::Normal, containing_item.stable_since())?;
2674 fn render_deref_methods(w: &mut fmt::Formatter, cx: &Context, impl_: &Impl,
2675 container_item: &clean::Item, deref_mut: bool) -> fmt::Result {
2676 let deref_type = impl_.inner_impl().trait_.as_ref().unwrap();
2677 let target = impl_.inner_impl().items.iter().filter_map(|item| {
2679 clean::TypedefItem(ref t, true) => Some(&t.type_),
2682 }).next().expect("Expected associated type binding");
2683 let what = AssocItemRender::DerefFor { trait_: deref_type, type_: target,
2684 deref_mut_: deref_mut };
2685 if let Some(did) = target.def_id() {
2686 render_assoc_items(w, cx, container_item, did, what)
2688 if let Some(prim) = target.primitive_type() {
2689 if let Some(c) = cache().primitive_locations.get(&prim) {
2690 let did = DefId { krate: *c, index: prim.to_def_index() };
2691 render_assoc_items(w, cx, container_item, did, what)?;
2698 fn render_impl(w: &mut fmt::Formatter, cx: &Context, i: &Impl, link: AssocItemLink,
2699 render_mode: RenderMode, outer_version: Option<&str>) -> fmt::Result {
2700 if render_mode == RenderMode::Normal {
2701 write!(w, "<h3 class='impl'><span class='in-band'><code>{}</code>", i.inner_impl())?;
2702 write!(w, "</span><span class='out-of-band'>")?;
2703 let since = i.impl_item.stability.as_ref().map(|s| &s.since[..]);
2704 if let Some(l) = (Item { item: &i.impl_item, cx: cx }).href() {
2705 write!(w, "<div class='ghost'></div>")?;
2706 render_stability_since_raw(w, since, outer_version)?;
2707 write!(w, "<a id='src-{}' class='srclink' \
2708 href='{}' title='{}'>[src]</a>",
2709 i.impl_item.def_id.index.as_usize(), l, "goto source code")?;
2711 render_stability_since_raw(w, since, outer_version)?;
2713 write!(w, "</span>")?;
2714 write!(w, "</h3>\n")?;
2715 if let Some(ref dox) = i.impl_item.attrs.value("doc") {
2716 write!(w, "<div class='docblock'>{}</div>", Markdown(dox))?;
2720 fn doc_impl_item(w: &mut fmt::Formatter, cx: &Context, item: &clean::Item,
2721 link: AssocItemLink, render_mode: RenderMode,
2722 is_default_item: bool, outer_version: Option<&str>,
2723 trait_: Option<&clean::Trait>) -> fmt::Result {
2724 let item_type = item_type(item);
2725 let name = item.name.as_ref().unwrap();
2727 let render_method_item: bool = match render_mode {
2728 RenderMode::Normal => true,
2729 RenderMode::ForDeref { mut_: deref_mut_ } => {
2730 let self_type_opt = match item.inner {
2731 clean::MethodItem(ref method) => method.decl.self_type(),
2732 clean::TyMethodItem(ref method) => method.decl.self_type(),
2736 if let Some(self_ty) = self_type_opt {
2737 let by_mut_ref = match self_ty {
2738 SelfTy::SelfBorrowed(_lifetime, mutability) => {
2739 mutability == Mutability::Mutable
2741 SelfTy::SelfExplicit(clean::BorrowedRef { mutability, .. }) => {
2742 mutability == Mutability::Mutable
2747 deref_mut_ || !by_mut_ref
2755 clean::MethodItem(..) | clean::TyMethodItem(..) => {
2756 // Only render when the method is not static or we allow static methods
2757 if render_method_item {
2758 let id = derive_id(format!("{}.{}", item_type, name));
2759 let ns_id = derive_id(format!("{}.{}", name, item_type.name_space()));
2760 write!(w, "<h4 id='{}' class='{}'>", id, item_type)?;
2761 write!(w, "<span id='{}' class='invisible'>", ns_id)?;
2762 write!(w, "<code>")?;
2763 render_assoc_item(w, item, link.anchor(&id))?;
2764 write!(w, "</code>")?;
2765 render_stability_since_raw(w, item.stable_since(), outer_version)?;
2766 write!(w, "</span></h4>\n")?;
2769 clean::TypedefItem(ref tydef, _) => {
2770 let id = derive_id(format!("{}.{}", ItemType::AssociatedType, name));
2771 let ns_id = derive_id(format!("{}.{}", name, item_type.name_space()));
2772 write!(w, "<h4 id='{}' class='{}'>", id, item_type)?;
2773 write!(w, "<span id='{}' class='invisible'><code>", ns_id)?;
2774 assoc_type(w, item, &Vec::new(), Some(&tydef.type_), link.anchor(&id))?;
2775 write!(w, "</code></span></h4>\n")?;
2777 clean::AssociatedConstItem(ref ty, ref default) => {
2778 let id = derive_id(format!("{}.{}", item_type, name));
2779 let ns_id = derive_id(format!("{}.{}", name, item_type.name_space()));
2780 write!(w, "<h4 id='{}' class='{}'>", id, item_type)?;
2781 write!(w, "<span id='{}' class='invisible'><code>", ns_id)?;
2782 assoc_const(w, item, ty, default.as_ref(), link.anchor(&id))?;
2783 write!(w, "</code></span></h4>\n")?;
2785 clean::ConstantItem(ref c) => {
2786 let id = derive_id(format!("{}.{}", item_type, name));
2787 let ns_id = derive_id(format!("{}.{}", name, item_type.name_space()));
2788 write!(w, "<h4 id='{}' class='{}'>", id, item_type)?;
2789 write!(w, "<span id='{}' class='invisible'><code>", ns_id)?;
2790 assoc_const(w, item, &c.type_, Some(&c.expr), link.anchor(&id))?;
2791 write!(w, "</code></span></h4>\n")?;
2793 clean::AssociatedTypeItem(ref bounds, ref default) => {
2794 let id = derive_id(format!("{}.{}", item_type, name));
2795 let ns_id = derive_id(format!("{}.{}", name, item_type.name_space()));
2796 write!(w, "<h4 id='{}' class='{}'>", id, item_type)?;
2797 write!(w, "<span id='{}' class='invisible'><code>", ns_id)?;
2798 assoc_type(w, item, bounds, default.as_ref(), link.anchor(&id))?;
2799 write!(w, "</code></span></h4>\n")?;
2801 clean::StrippedItem(..) => return Ok(()),
2802 _ => panic!("can't make docs for trait item with name {:?}", item.name)
2805 if render_method_item || render_mode == RenderMode::Normal {
2806 if !is_default_item {
2807 if let Some(t) = trait_ {
2808 // The trait item may have been stripped so we might not
2809 // find any documentation or stability for it.
2810 if let Some(it) = t.items.iter().find(|i| i.name == item.name) {
2811 // We need the stability of the item from the trait
2812 // because impls can't have a stability.
2813 document_stability(w, cx, it)?;
2814 if item.doc_value().is_some() {
2815 document_full(w, item)?;
2817 // In case the item isn't documented,
2818 // provide short documentation from the trait.
2819 document_short(w, it, link)?;
2823 document(w, cx, item)?;
2826 document_stability(w, cx, item)?;
2827 document_short(w, item, link)?;
2833 let traits = &cache().traits;
2834 let trait_ = i.trait_did().and_then(|did| traits.get(&did));
2836 write!(w, "<div class='impl-items'>")?;
2837 for trait_item in &i.inner_impl().items {
2838 doc_impl_item(w, cx, trait_item, link, render_mode,
2839 false, outer_version, trait_)?;
2842 fn render_default_items(w: &mut fmt::Formatter,
2846 render_mode: RenderMode,
2847 outer_version: Option<&str>) -> fmt::Result {
2848 for trait_item in &t.items {
2849 let n = trait_item.name.clone();
2850 if i.items.iter().find(|m| m.name == n).is_some() {
2853 let did = i.trait_.as_ref().unwrap().def_id().unwrap();
2854 let assoc_link = AssocItemLink::GotoSource(did, &i.provided_trait_methods);
2856 doc_impl_item(w, cx, trait_item, assoc_link, render_mode, true,
2857 outer_version, None)?;
2862 // If we've implemented a trait, then also emit documentation for all
2863 // default items which weren't overridden in the implementation block.
2864 if let Some(t) = trait_ {
2865 render_default_items(w, cx, t, &i.inner_impl(), render_mode, outer_version)?;
2867 write!(w, "</div>")?;
2871 fn item_typedef(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
2872 t: &clean::Typedef) -> fmt::Result {
2873 write!(w, "<pre class='rust typedef'>type {}{}{where_clause} = {type_};</pre>",
2874 it.name.as_ref().unwrap(),
2876 where_clause = WhereClause(&t.generics),
2882 impl<'a> fmt::Display for Sidebar<'a> {
2883 fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
2886 let parentlen = cx.current.len() - if it.is_mod() {1} else {0};
2888 // the sidebar is designed to display sibling functions, modules and
2889 // other miscellaneous information. since there are lots of sibling
2890 // items (and that causes quadratic growth in large modules),
2891 // we refactor common parts into a shared JavaScript file per module.
2892 // still, we don't move everything into JS because we want to preserve
2893 // as much HTML as possible in order to allow non-JS-enabled browsers
2894 // to navigate the documentation (though slightly inefficiently).
2896 write!(fmt, "<p class='location'>")?;
2897 for (i, name) in cx.current.iter().take(parentlen).enumerate() {
2899 write!(fmt, "::<wbr>")?;
2901 write!(fmt, "<a href='{}index.html'>{}</a>",
2902 &cx.root_path[..(cx.current.len() - i - 1) * 3],
2905 write!(fmt, "</p>")?;
2907 // sidebar refers to the enclosing module, not this module
2908 let relpath = if it.is_mod() { "../" } else { "" };
2910 "<script>window.sidebarCurrent = {{\
2915 name = it.name.as_ref().map(|x| &x[..]).unwrap_or(""),
2916 ty = item_type(it).css_class(),
2919 // there is no sidebar-items.js beyond the crate root path
2920 // FIXME maybe dynamic crate loading can be merged here
2922 write!(fmt, "<script defer src=\"{path}sidebar-items.js\"></script>",
2930 impl<'a> fmt::Display for Source<'a> {
2931 fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
2932 let Source(s) = *self;
2933 let lines = s.lines().count();
2935 let mut tmp = lines;
2940 write!(fmt, "<pre class=\"line-numbers\">")?;
2941 for i in 1..lines + 1 {
2942 write!(fmt, "<span id=\"{0}\">{0:1$}</span>\n", i, cols)?;
2944 write!(fmt, "</pre>")?;
2945 write!(fmt, "{}", highlight::render_with_highlighting(s, None, None))?;
2950 fn item_macro(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
2951 t: &clean::Macro) -> fmt::Result {
2952 w.write_str(&highlight::render_with_highlighting(&t.source,
2955 render_stability_since_raw(w, it.stable_since(), None)?;
2959 fn item_primitive(w: &mut fmt::Formatter, cx: &Context,
2961 _p: &clean::PrimitiveType) -> fmt::Result {
2962 document(w, cx, it)?;
2963 render_assoc_items(w, cx, it, it.def_id, AssocItemRender::All)
2966 const BASIC_KEYWORDS: &'static str = "rust, rustlang, rust-lang";
2968 fn make_item_keywords(it: &clean::Item) -> String {
2969 format!("{}, {}", BASIC_KEYWORDS, it.name.as_ref().unwrap())
2972 fn get_index_search_type(item: &clean::Item) -> Option<IndexItemFunctionType> {
2973 let decl = match item.inner {
2974 clean::FunctionItem(ref f) => &f.decl,
2975 clean::MethodItem(ref m) => &m.decl,
2976 clean::TyMethodItem(ref m) => &m.decl,
2980 let inputs = decl.inputs.values.iter().map(|arg| get_index_type(&arg.type_)).collect();
2981 let output = match decl.output {
2982 clean::FunctionRetTy::Return(ref return_type) => Some(get_index_type(return_type)),
2986 Some(IndexItemFunctionType { inputs: inputs, output: output })
2989 fn get_index_type(clean_type: &clean::Type) -> Type {
2990 Type { name: get_index_type_name(clean_type).map(|s| s.to_ascii_lowercase()) }
2993 fn get_index_type_name(clean_type: &clean::Type) -> Option<String> {
2995 clean::ResolvedPath { ref path, .. } => {
2996 let segments = &path.segments;
2997 Some(segments[segments.len() - 1].name.clone())
2999 clean::Generic(ref s) => Some(s.clone()),
3000 clean::Primitive(ref p) => Some(format!("{:?}", p)),
3001 clean::BorrowedRef { ref type_, .. } => get_index_type_name(type_),
3002 // FIXME: add all from clean::Type.
3007 pub fn cache() -> Arc<Cache> {
3008 CACHE_KEY.with(|c| c.borrow().clone())
3013 fn test_unique_id() {
3014 let input = ["foo", "examples", "examples", "method.into_iter","examples",
3015 "method.into_iter", "foo", "main", "search", "methods",
3016 "examples", "method.into_iter", "assoc_type.Item", "assoc_type.Item"];
3017 let expected = ["foo", "examples", "examples-1", "method.into_iter", "examples-2",
3018 "method.into_iter-1", "foo-1", "main-1", "search-1", "methods-1",
3019 "examples-3", "method.into_iter-2", "assoc_type.Item", "assoc_type.Item-1"];
3022 let actual: Vec<String> = input.iter().map(|s| derive_id(s.to_string())).collect();
3023 assert_eq!(&actual[..], expected);