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print_item.rs
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print_item.rs
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use clean::AttributesExt;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_hir as hir;
use rustc_hir::def::CtorKind;
use rustc_hir::def_id::DefId;
use rustc_middle::middle::stability;
use rustc_middle::span_bug;
use rustc_middle::ty::layout::LayoutError;
use rustc_middle::ty::{Adt, TyCtxt};
use rustc_span::hygiene::MacroKind;
use rustc_span::symbol::{kw, sym, Symbol};
use rustc_target::abi::{Layout, Primitive, TagEncoding, Variants};
use std::cmp::Ordering;
use std::fmt;
use std::rc::Rc;
use super::{
collect_paths_for_type, document, ensure_trailing_slash, get_filtered_impls_for_reference,
item_ty_to_section, notable_traits_decl, render_all_impls, render_assoc_item,
render_assoc_items, render_attributes_in_code, render_attributes_in_pre, render_impl,
render_rightside, render_stability_since_raw, AssocItemLink, Context, ImplRenderingParameters,
};
use crate::clean;
use crate::config::ModuleSorting;
use crate::formats::item_type::ItemType;
use crate::formats::{AssocItemRender, Impl, RenderMode};
use crate::html::escape::Escape;
use crate::html::format::{
join_with_double_colon, print_abi_with_space, print_constness_with_space, print_where_clause,
Buffer, Ending, PrintWithSpace,
};
use crate::html::highlight;
use crate::html::layout::Page;
use crate::html::markdown::{HeadingOffset, MarkdownSummaryLine};
use crate::html::url_parts_builder::UrlPartsBuilder;
use askama::Template;
use itertools::Itertools;
const ITEM_TABLE_OPEN: &str = "<div class=\"item-table\">";
const ITEM_TABLE_CLOSE: &str = "</div>";
const ITEM_TABLE_ROW_OPEN: &str = "<div class=\"item-row\">";
const ITEM_TABLE_ROW_CLOSE: &str = "</div>";
// A component in a `use` path, like `string` in std::string::ToString
struct PathComponent {
path: String,
name: Symbol,
}
#[derive(Template)]
#[template(path = "print_item.html")]
struct ItemVars<'a> {
page: &'a Page<'a>,
static_root_path: &'a str,
typ: &'a str,
name: &'a str,
item_type: &'a str,
path_components: Vec<PathComponent>,
stability_since_raw: &'a str,
src_href: Option<&'a str>,
}
/// Calls `print_where_clause` and returns `true` if a `where` clause was generated.
fn print_where_clause_and_check<'a, 'tcx: 'a>(
buffer: &mut Buffer,
gens: &'a clean::Generics,
cx: &'a Context<'tcx>,
) -> bool {
let len_before = buffer.len();
write!(buffer, "{}", print_where_clause(gens, cx, 0, Ending::Newline));
len_before != buffer.len()
}
pub(super) fn print_item(
cx: &mut Context<'_>,
item: &clean::Item,
buf: &mut Buffer,
page: &Page<'_>,
) {
debug_assert!(!item.is_stripped());
let typ = match *item.kind {
clean::ModuleItem(_) => {
if item.is_crate() {
"Crate "
} else {
"Module "
}
}
clean::FunctionItem(..) | clean::ForeignFunctionItem(..) => "Function ",
clean::TraitItem(..) => "Trait ",
clean::StructItem(..) => "Struct ",
clean::UnionItem(..) => "Union ",
clean::EnumItem(..) => "Enum ",
clean::TypedefItem(..) => "Type Definition ",
clean::MacroItem(..) => "Macro ",
clean::ProcMacroItem(ref mac) => match mac.kind {
MacroKind::Bang => "Macro ",
MacroKind::Attr => "Attribute Macro ",
MacroKind::Derive => "Derive Macro ",
},
clean::PrimitiveItem(..) => "Primitive Type ",
clean::StaticItem(..) | clean::ForeignStaticItem(..) => "Static ",
clean::ConstantItem(..) => "Constant ",
clean::ForeignTypeItem => "Foreign Type ",
clean::KeywordItem => "Keyword ",
clean::OpaqueTyItem(..) => "Opaque Type ",
clean::TraitAliasItem(..) => "Trait Alias ",
_ => {
// We don't generate pages for any other type.
unreachable!();
}
};
let mut stability_since_raw = Buffer::new();
render_stability_since_raw(
&mut stability_since_raw,
item.stable_since(cx.tcx()),
item.const_stability(cx.tcx()),
None,
None,
);
let stability_since_raw: String = stability_since_raw.into_inner();
// Write source tag
//
// When this item is part of a `crate use` in a downstream crate, the
// source link in the downstream documentation will actually come back to
// this page, and this link will be auto-clicked. The `id` attribute is
// used to find the link to auto-click.
let src_href =
if cx.include_sources && !item.is_primitive() { cx.src_href(item) } else { None };
let path_components = if item.is_primitive() || item.is_keyword() {
vec![]
} else {
let cur = &cx.current;
let amt = if item.is_mod() { cur.len() - 1 } else { cur.len() };
cur.iter()
.enumerate()
.take(amt)
.map(|(i, component)| PathComponent {
path: "../".repeat(cur.len() - i - 1),
name: *component,
})
.collect()
};
let item_vars = ItemVars {
page,
static_root_path: page.get_static_root_path(),
typ,
name: item.name.as_ref().unwrap().as_str(),
item_type: &item.type_().to_string(),
path_components,
stability_since_raw: &stability_since_raw,
src_href: src_href.as_deref(),
};
item_vars.render_into(buf).unwrap();
match &*item.kind {
clean::ModuleItem(ref m) => item_module(buf, cx, item, &m.items),
clean::FunctionItem(ref f) | clean::ForeignFunctionItem(ref f) => {
item_function(buf, cx, item, f)
}
clean::TraitItem(ref t) => item_trait(buf, cx, item, t),
clean::StructItem(ref s) => item_struct(buf, cx, item, s),
clean::UnionItem(ref s) => item_union(buf, cx, item, s),
clean::EnumItem(ref e) => item_enum(buf, cx, item, e),
clean::TypedefItem(ref t) => item_typedef(buf, cx, item, t),
clean::MacroItem(ref m) => item_macro(buf, cx, item, m),
clean::ProcMacroItem(ref m) => item_proc_macro(buf, cx, item, m),
clean::PrimitiveItem(_) => item_primitive(buf, cx, item),
clean::StaticItem(ref i) | clean::ForeignStaticItem(ref i) => item_static(buf, cx, item, i),
clean::ConstantItem(ref c) => item_constant(buf, cx, item, c),
clean::ForeignTypeItem => item_foreign_type(buf, cx, item),
clean::KeywordItem => item_keyword(buf, cx, item),
clean::OpaqueTyItem(ref e) => item_opaque_ty(buf, cx, item, e),
clean::TraitAliasItem(ref ta) => item_trait_alias(buf, cx, item, ta),
_ => {
// We don't generate pages for any other type.
unreachable!();
}
}
}
/// For large structs, enums, unions, etc, determine whether to hide their fields
fn should_hide_fields(n_fields: usize) -> bool {
n_fields > 12
}
fn toggle_open(w: &mut Buffer, text: impl fmt::Display) {
write!(
w,
"<details class=\"rustdoc-toggle type-contents-toggle\">\
<summary class=\"hideme\">\
<span>Show {}</span>\
</summary>",
text
);
}
fn toggle_close(w: &mut Buffer) {
w.write_str("</details>");
}
fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items: &[clean::Item]) {
document(w, cx, item, None, HeadingOffset::H2);
let mut indices = (0..items.len()).filter(|i| !items[*i].is_stripped()).collect::<Vec<usize>>();
// the order of item types in the listing
fn reorder(ty: ItemType) -> u8 {
match ty {
ItemType::ExternCrate => 0,
ItemType::Import => 1,
ItemType::Primitive => 2,
ItemType::Module => 3,
ItemType::Macro => 4,
ItemType::Struct => 5,
ItemType::Enum => 6,
ItemType::Constant => 7,
ItemType::Static => 8,
ItemType::Trait => 9,
ItemType::Function => 10,
ItemType::Typedef => 12,
ItemType::Union => 13,
_ => 14 + ty as u8,
}
}
fn cmp(
i1: &clean::Item,
i2: &clean::Item,
idx1: usize,
idx2: usize,
tcx: TyCtxt<'_>,
) -> Ordering {
let ty1 = i1.type_();
let ty2 = i2.type_();
if item_ty_to_section(ty1) != item_ty_to_section(ty2)
|| (ty1 != ty2 && (ty1 == ItemType::ExternCrate || ty2 == ItemType::ExternCrate))
{
return (reorder(ty1), idx1).cmp(&(reorder(ty2), idx2));
}
let s1 = i1.stability(tcx).as_ref().map(|s| s.level);
let s2 = i2.stability(tcx).as_ref().map(|s| s.level);
if let (Some(a), Some(b)) = (s1, s2) {
match (a.is_stable(), b.is_stable()) {
(true, true) | (false, false) => {}
(false, true) => return Ordering::Less,
(true, false) => return Ordering::Greater,
}
}
let lhs = i1.name.unwrap_or(kw::Empty);
let rhs = i2.name.unwrap_or(kw::Empty);
compare_names(lhs.as_str(), rhs.as_str())
}
match cx.shared.module_sorting {
ModuleSorting::Alphabetical => {
indices.sort_by(|&i1, &i2| cmp(&items[i1], &items[i2], i1, i2, cx.tcx()));
}
ModuleSorting::DeclarationOrder => {}
}
// This call is to remove re-export duplicates in cases such as:
//
// ```
// pub(crate) mod foo {
// pub(crate) mod bar {
// pub(crate) trait Double { fn foo(); }
// }
// }
//
// pub(crate) use foo::bar::*;
// pub(crate) use foo::*;
// ```
//
// `Double` will appear twice in the generated docs.
//
// FIXME: This code is quite ugly and could be improved. Small issue: DefId
// can be identical even if the elements are different (mostly in imports).
// So in case this is an import, we keep everything by adding a "unique id"
// (which is the position in the vector).
indices.dedup_by_key(|i| {
(
items[*i].item_id,
if items[*i].name.is_some() { Some(full_path(cx, &items[*i])) } else { None },
items[*i].type_(),
if items[*i].is_import() { *i } else { 0 },
)
});
debug!("{:?}", indices);
let mut last_section = None;
for &idx in &indices {
let myitem = &items[idx];
if myitem.is_stripped() {
continue;
}
let my_section = item_ty_to_section(myitem.type_());
if Some(my_section) != last_section {
if last_section.is_some() {
w.write_str(ITEM_TABLE_CLOSE);
}
last_section = Some(my_section);
write!(
w,
"<h2 id=\"{id}\" class=\"small-section-header\">\
<a href=\"#{id}\">{name}</a>\
</h2>{}",
ITEM_TABLE_OPEN,
id = cx.derive_id(my_section.id().to_owned()),
name = my_section.name(),
);
}
match *myitem.kind {
clean::ExternCrateItem { ref src } => {
use crate::html::format::anchor;
w.write_str(ITEM_TABLE_ROW_OPEN);
match *src {
Some(src) => write!(
w,
"<div class=\"item-left\"><code>{}extern crate {} as {};",
myitem.visibility.print_with_space(myitem.item_id, cx),
anchor(myitem.item_id.expect_def_id(), src, cx),
myitem.name.unwrap(),
),
None => write!(
w,
"<div class=\"item-left\"><code>{}extern crate {};",
myitem.visibility.print_with_space(myitem.item_id, cx),
anchor(myitem.item_id.expect_def_id(), myitem.name.unwrap(), cx),
),
}
w.write_str("</code></div>");
w.write_str(ITEM_TABLE_ROW_CLOSE);
}
clean::ImportItem(ref import) => {
let (stab, stab_tags) = if let Some(import_def_id) = import.source.did {
let ast_attrs = cx.tcx().get_attrs_unchecked(import_def_id);
let import_attrs = Box::new(clean::Attributes::from_ast(ast_attrs));
// Just need an item with the correct def_id and attrs
let import_item = clean::Item {
item_id: import_def_id.into(),
attrs: import_attrs,
cfg: ast_attrs.cfg(cx.tcx(), &cx.cache().hidden_cfg),
..myitem.clone()
};
let stab = import_item.stability_class(cx.tcx());
let stab_tags = Some(extra_info_tags(&import_item, item, cx.tcx()));
(stab, stab_tags)
} else {
(None, None)
};
let add = if stab.is_some() { " " } else { "" };
w.write_str(ITEM_TABLE_ROW_OPEN);
let id = match import.kind {
clean::ImportKind::Simple(s) => {
format!(" id=\"{}\"", cx.derive_id(format!("reexport.{}", s)))
}
clean::ImportKind::Glob => String::new(),
};
let stab_tags = stab_tags.unwrap_or_default();
let (stab_tags_before, stab_tags_after) = if stab_tags.is_empty() {
("", "")
} else {
("<div class=\"item-right docblock-short\">", "</div>")
};
write!(
w,
"<div class=\"item-left {stab}{add}import-item\"{id}>\
<code>{vis}{imp}</code>\
</div>\
{stab_tags_before}{stab_tags}{stab_tags_after}",
stab = stab.unwrap_or_default(),
vis = myitem.visibility.print_with_space(myitem.item_id, cx),
imp = import.print(cx),
);
w.write_str(ITEM_TABLE_ROW_CLOSE);
}
_ => {
if myitem.name.is_none() {
continue;
}
let unsafety_flag = match *myitem.kind {
clean::FunctionItem(_) | clean::ForeignFunctionItem(_)
if myitem.fn_header(cx.tcx()).unwrap().unsafety
== hir::Unsafety::Unsafe =>
{
"<a title=\"unsafe function\" href=\"#\"><sup>⚠</sup></a>"
}
_ => "",
};
let stab = myitem.stability_class(cx.tcx());
let add = if stab.is_some() { " " } else { "" };
let visibility_emoji = match myitem.visibility {
clean::Visibility::Restricted(_) => {
"<span title=\"Restricted Visibility\"> 🔒</span> "
}
_ => "",
};
let doc_value = myitem.doc_value().unwrap_or_default();
w.write_str(ITEM_TABLE_ROW_OPEN);
let docs = MarkdownSummaryLine(&doc_value, &myitem.links(cx)).into_string();
let (docs_before, docs_after) = if docs.is_empty() {
("", "")
} else {
("<div class=\"item-right docblock-short\">", "</div>")
};
write!(
w,
"<div class=\"item-left {stab}{add}module-item\">\
<a class=\"{class}\" href=\"{href}\" title=\"{title}\">{name}</a>\
{visibility_emoji}\
{unsafety_flag}\
{stab_tags}\
</div>\
{docs_before}{docs}{docs_after}",
name = myitem.name.unwrap(),
visibility_emoji = visibility_emoji,
stab_tags = extra_info_tags(myitem, item, cx.tcx()),
class = myitem.type_(),
add = add,
stab = stab.unwrap_or_default(),
unsafety_flag = unsafety_flag,
href = item_path(myitem.type_(), myitem.name.unwrap().as_str()),
title = [full_path(cx, myitem), myitem.type_().to_string()]
.iter()
.filter_map(|s| if !s.is_empty() { Some(s.as_str()) } else { None })
.collect::<Vec<_>>()
.join(" "),
);
w.write_str(ITEM_TABLE_ROW_CLOSE);
}
}
}
if last_section.is_some() {
w.write_str(ITEM_TABLE_CLOSE);
}
}
/// Render the stability, deprecation and portability tags that are displayed in the item's summary
/// at the module level.
fn extra_info_tags(item: &clean::Item, parent: &clean::Item, tcx: TyCtxt<'_>) -> String {
let mut tags = String::new();
fn tag_html(class: &str, title: &str, contents: &str) -> String {
format!(r#"<span class="stab {}" title="{}">{}</span>"#, class, Escape(title), contents)
}
// The trailing space after each tag is to space it properly against the rest of the docs.
if let Some(depr) = &item.deprecation(tcx) {
let mut message = "Deprecated";
if !stability::deprecation_in_effect(depr) {
message = "Deprecation planned";
}
tags += &tag_html("deprecated", "", message);
}
// The "rustc_private" crates are permanently unstable so it makes no sense
// to render "unstable" everywhere.
if item.stability(tcx).as_ref().map(|s| s.is_unstable() && s.feature != sym::rustc_private)
== Some(true)
{
tags += &tag_html("unstable", "", "Experimental");
}
let cfg = match (&item.cfg, parent.cfg.as_ref()) {
(Some(cfg), Some(parent_cfg)) => cfg.simplify_with(parent_cfg),
(cfg, _) => cfg.as_deref().cloned(),
};
debug!("Portability name={:?} {:?} - {:?} = {:?}", item.name, item.cfg, parent.cfg, cfg);
if let Some(ref cfg) = cfg {
tags += &tag_html("portability", &cfg.render_long_plain(), &cfg.render_short_html());
}
tags
}
fn item_function(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item, f: &clean::Function) {
let header = it.fn_header(cx.tcx()).expect("printing a function which isn't a function");
let constness = print_constness_with_space(&header.constness, it.const_stability(cx.tcx()));
let unsafety = header.unsafety.print_with_space();
let abi = print_abi_with_space(header.abi).to_string();
let asyncness = header.asyncness.print_with_space();
let visibility = it.visibility.print_with_space(it.item_id, cx).to_string();
let name = it.name.unwrap();
let generics_len = format!("{:#}", f.generics.print(cx)).len();
let header_len = "fn ".len()
+ visibility.len()
+ constness.len()
+ asyncness.len()
+ unsafety.len()
+ abi.len()
+ name.as_str().len()
+ generics_len;
wrap_into_item_decl(w, |w| {
wrap_item(w, "fn", |w| {
render_attributes_in_pre(w, it, "");
w.reserve(header_len);
write!(
w,
"{vis}{constness}{asyncness}{unsafety}{abi}fn \
{name}{generics}{decl}{notable_traits}{where_clause}",
vis = visibility,
constness = constness,
asyncness = asyncness,
unsafety = unsafety,
abi = abi,
name = name,
generics = f.generics.print(cx),
where_clause = print_where_clause(&f.generics, cx, 0, Ending::Newline),
decl = f.decl.full_print(header_len, 0, cx),
notable_traits = notable_traits_decl(&f.decl, cx),
);
});
});
document(w, cx, it, None, HeadingOffset::H2)
}
fn item_trait(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item, t: &clean::Trait) {
let bounds = bounds(&t.bounds, false, cx);
let required_types = t.items.iter().filter(|m| m.is_ty_associated_type()).collect::<Vec<_>>();
let provided_types = t.items.iter().filter(|m| m.is_associated_type()).collect::<Vec<_>>();
let required_consts = t.items.iter().filter(|m| m.is_ty_associated_const()).collect::<Vec<_>>();
let provided_consts = t.items.iter().filter(|m| m.is_associated_const()).collect::<Vec<_>>();
let required_methods = t.items.iter().filter(|m| m.is_ty_method()).collect::<Vec<_>>();
let provided_methods = t.items.iter().filter(|m| m.is_method()).collect::<Vec<_>>();
let count_types = required_types.len() + provided_types.len();
let count_consts = required_consts.len() + provided_consts.len();
let count_methods = required_methods.len() + provided_methods.len();
let must_implement_one_of_functions =
cx.tcx().trait_def(t.def_id).must_implement_one_of.clone();
// Output the trait definition
wrap_into_item_decl(w, |w| {
wrap_item(w, "trait", |w| {
render_attributes_in_pre(w, it, "");
write!(
w,
"{}{}{}trait {}{}{}",
it.visibility.print_with_space(it.item_id, cx),
t.unsafety(cx.tcx()).print_with_space(),
if t.is_auto(cx.tcx()) { "auto " } else { "" },
it.name.unwrap(),
t.generics.print(cx),
bounds
);
if !t.generics.where_predicates.is_empty() {
write!(w, "{}", print_where_clause(&t.generics, cx, 0, Ending::Newline));
} else {
w.write_str(" ");
}
if t.items.is_empty() {
w.write_str("{ }");
} else {
// FIXME: we should be using a derived_id for the Anchors here
w.write_str("{\n");
let mut toggle = false;
// If there are too many associated types, hide _everything_
if should_hide_fields(count_types) {
toggle = true;
toggle_open(
w,
format_args!(
"{} associated items",
count_types + count_consts + count_methods
),
);
}
for types in [&required_types, &provided_types] {
for t in types {
render_assoc_item(
w,
t,
AssocItemLink::Anchor(None),
ItemType::Trait,
cx,
RenderMode::Normal,
);
w.write_str(";\n");
}
}
// If there are too many associated constants, hide everything after them
// We also do this if the types + consts is large because otherwise we could
// render a bunch of types and _then_ a bunch of consts just because both were
// _just_ under the limit
if !toggle && should_hide_fields(count_types + count_consts) {
toggle = true;
toggle_open(
w,
format_args!(
"{} associated constant{} and {} method{}",
count_consts,
pluralize(count_consts),
count_methods,
pluralize(count_methods),
),
);
}
if count_types != 0 && (count_consts != 0 || count_methods != 0) {
w.write_str("\n");
}
for consts in [&required_consts, &provided_consts] {
for c in consts {
render_assoc_item(
w,
c,
AssocItemLink::Anchor(None),
ItemType::Trait,
cx,
RenderMode::Normal,
);
w.write_str(";\n");
}
}
if !toggle && should_hide_fields(count_methods) {
toggle = true;
toggle_open(w, format_args!("{} methods", count_methods));
}
if count_consts != 0 && count_methods != 0 {
w.write_str("\n");
}
for (pos, m) in required_methods.iter().enumerate() {
render_assoc_item(
w,
m,
AssocItemLink::Anchor(None),
ItemType::Trait,
cx,
RenderMode::Normal,
);
w.write_str(";\n");
if pos < required_methods.len() - 1 {
w.write_str("<span class=\"item-spacer\"></span>");
}
}
if !required_methods.is_empty() && !provided_methods.is_empty() {
w.write_str("\n");
}
for (pos, m) in provided_methods.iter().enumerate() {
render_assoc_item(
w,
m,
AssocItemLink::Anchor(None),
ItemType::Trait,
cx,
RenderMode::Normal,
);
match *m.kind {
clean::MethodItem(ref inner, _)
if !inner.generics.where_predicates.is_empty() =>
{
w.write_str(",\n { ... }\n");
}
_ => {
w.write_str(" { ... }\n");
}
}
if pos < provided_methods.len() - 1 {
w.write_str("<span class=\"item-spacer\"></span>");
}
}
if toggle {
toggle_close(w);
}
w.write_str("}");
}
});
});
// Trait documentation
document(w, cx, it, None, HeadingOffset::H2);
fn write_small_section_header(w: &mut Buffer, id: &str, title: &str, extra_content: &str) {
write!(
w,
"<h2 id=\"{0}\" class=\"small-section-header\">\
{1}<a href=\"#{0}\" class=\"anchor\"></a>\
</h2>{2}",
id, title, extra_content
)
}
fn trait_item(w: &mut Buffer, cx: &mut Context<'_>, m: &clean::Item, t: &clean::Item) {
let name = m.name.unwrap();
info!("Documenting {} on {:?}", name, t.name);
let item_type = m.type_();
let id = cx.derive_id(format!("{}.{}", item_type, name));
let mut content = Buffer::empty_from(w);
document(&mut content, cx, m, Some(t), HeadingOffset::H5);
let toggled = !content.is_empty();
if toggled {
write!(w, "<details class=\"rustdoc-toggle\" open><summary>");
}
write!(w, "<div id=\"{}\" class=\"method has-srclink\">", id);
render_rightside(w, cx, m, t, RenderMode::Normal);
write!(w, "<h4 class=\"code-header\">");
render_assoc_item(
w,
m,
AssocItemLink::Anchor(Some(&id)),
ItemType::Impl,
cx,
RenderMode::Normal,
);
w.write_str("</h4>");
w.write_str("</div>");
if toggled {
write!(w, "</summary>");
w.push_buffer(content);
write!(w, "</details>");
}
}
if !required_types.is_empty() {
write_small_section_header(
w,
"required-associated-types",
"Required Associated Types",
"<div class=\"methods\">",
);
for t in required_types {
trait_item(w, cx, t, it);
}
w.write_str("</div>");
}
if !provided_types.is_empty() {
write_small_section_header(
w,
"provided-associated-types",
"Provided Associated Types",
"<div class=\"methods\">",
);
for t in provided_types {
trait_item(w, cx, t, it);
}
w.write_str("</div>");
}
if !required_consts.is_empty() {
write_small_section_header(
w,
"required-associated-consts",
"Required Associated Constants",
"<div class=\"methods\">",
);
for t in required_consts {
trait_item(w, cx, t, it);
}
w.write_str("</div>");
}
if !provided_consts.is_empty() {
write_small_section_header(
w,
"provided-associated-consts",
"Provided Associated Constants",
"<div class=\"methods\">",
);
for t in provided_consts {
trait_item(w, cx, t, it);
}
w.write_str("</div>");
}
// Output the documentation for each function individually
if !required_methods.is_empty() || must_implement_one_of_functions.is_some() {
write_small_section_header(
w,
"required-methods",
"Required Methods",
"<div class=\"methods\">",
);
if let Some(list) = must_implement_one_of_functions.as_deref() {
write!(
w,
"<div class=\"stab must_implement\">At least one of the `{}` methods is required.</div>",
list.iter().join("`, `")
);
}
for m in required_methods {
trait_item(w, cx, m, it);
}
w.write_str("</div>");
}
if !provided_methods.is_empty() {
write_small_section_header(
w,
"provided-methods",
"Provided Methods",
"<div class=\"methods\">",
);
for m in provided_methods {
trait_item(w, cx, m, it);
}
w.write_str("</div>");
}
// If there are methods directly on this trait object, render them here.
render_assoc_items(w, cx, it, it.item_id.expect_def_id(), AssocItemRender::All);
let cloned_shared = Rc::clone(&cx.shared);
let cache = &cloned_shared.cache;
let mut extern_crates = FxHashSet::default();
if let Some(implementors) = cache.implementors.get(&it.item_id.expect_def_id()) {
// The DefId is for the first Type found with that name. The bool is
// if any Types with the same name but different DefId have been found.
let mut implementor_dups: FxHashMap<Symbol, (DefId, bool)> = FxHashMap::default();
for implementor in implementors {
if let Some(did) = implementor.inner_impl().for_.without_borrowed_ref().def_id(cache) &&
!did.is_local() {
extern_crates.insert(did.krate);
}
match implementor.inner_impl().for_.without_borrowed_ref() {
clean::Type::Path { ref path } if !path.is_assoc_ty() => {
let did = path.def_id();
let &mut (prev_did, ref mut has_duplicates) =
implementor_dups.entry(path.last()).or_insert((did, false));
if prev_did != did {
*has_duplicates = true;
}
}
_ => {}
}
}
let (local, foreign) =
implementors.iter().partition::<Vec<_>, _>(|i| i.is_on_local_type(cx));
let (mut synthetic, mut concrete): (Vec<&&Impl>, Vec<&&Impl>) =
local.iter().partition(|i| i.inner_impl().kind.is_auto());
synthetic.sort_by(|a, b| compare_impl(a, b, cx));
concrete.sort_by(|a, b| compare_impl(a, b, cx));
if !foreign.is_empty() {
write_small_section_header(w, "foreign-impls", "Implementations on Foreign Types", "");
for implementor in foreign {
let provided_methods = implementor.inner_impl().provided_trait_methods(cx.tcx());
let assoc_link =
AssocItemLink::GotoSource(implementor.impl_item.item_id, &provided_methods);
render_impl(
w,
cx,
implementor,
it,
assoc_link,
RenderMode::Normal,
None,
&[],
ImplRenderingParameters {
show_def_docs: false,
show_default_items: false,
show_non_assoc_items: true,
toggle_open_by_default: false,
},
);
}
}
write_small_section_header(
w,
"implementors",
"Implementors",
"<div class=\"item-list\" id=\"implementors-list\">",
);
for implementor in concrete {
render_implementor(cx, implementor, it, w, &implementor_dups, &[]);
}
w.write_str("</div>");
if t.is_auto(cx.tcx()) {
write_small_section_header(
w,
"synthetic-implementors",
"Auto implementors",
"<div class=\"item-list\" id=\"synthetic-implementors-list\">",
);
for implementor in synthetic {
render_implementor(
cx,
implementor,
it,
w,
&implementor_dups,
&collect_paths_for_type(implementor.inner_impl().for_.clone(), cache),
);
}
w.write_str("</div>");
}
} else {
// even without any implementations to write in, we still want the heading and list, so the
// implementors javascript file pulled in below has somewhere to write the impls into
write_small_section_header(
w,
"implementors",
"Implementors",
"<div class=\"item-list\" id=\"implementors-list\"></div>",
);
if t.is_auto(cx.tcx()) {
write_small_section_header(
w,
"synthetic-implementors",
"Auto implementors",
"<div class=\"item-list\" id=\"synthetic-implementors-list\"></div>",
);
}
}
// Include implementors in crates that depend on the current crate.
//
// This is complicated by the way rustdoc is invoked, which is basically
// the same way rustc is invoked: it gets called, one at a time, for each
// crate. When building the rustdocs for the current crate, rustdoc can
// see crate metadata for its dependencies, but cannot see metadata for its
// dependents.
//
// To make this work, we generate a "hook" at this stage, and our
// dependents can "plug in" to it when they build. For simplicity's sake,
// it's [JSONP]: a JavaScript file with the data we need (and can parse),
// surrounded by a tiny wrapper that the Rust side ignores, but allows the
// JavaScript side to include without having to worry about Same Origin
// Policy. The code for *that* is in `write_shared.rs`.
//
// This is further complicated by `#[doc(inline)]`. We want all copies
// of an inlined trait to reference the same JS file, to address complex
// dependency graphs like this one (lower crates depend on higher crates):
//
// ```text
// --------------------------------------------
// | crate A: trait Foo |
// --------------------------------------------
// | |
// -------------------------------- |
// | crate B: impl A::Foo for Bar | |
// -------------------------------- |
// | |
// ---------------------------------------------
// | crate C: #[doc(inline)] use A::Foo as Baz |
// | impl Baz for Quux |
// ---------------------------------------------
// ```
//
// Basically, we want `C::Baz` and `A::Foo` to show the same set of
// impls, which is easier if they both treat `/implementors/A/trait.Foo.js`
// as the Single Source of Truth.
//
// We also want the `impl Baz for Quux` to be written to
// `trait.Foo.js`. However, when we generate plain HTML for `C::Baz`,
// we're going to want to generate plain HTML for `impl Baz for Quux` too,
// because that'll load faster, and it's better for SEO. And we don't want
// the same impl to show up twice on the same page.
//
// To make this work, the implementors JS file has a structure kinda
// like this:
//
// ```js
// JSONP({
// "B": {"impl A::Foo for Bar"},
// "C": {"impl Baz for Quux"},
// });
// ```
//
// First of all, this means we can rebuild a crate, and it'll replace its own
// data if something changes. That is, `rustdoc` is idempotent. The other
// advantage is that we can list the crates that get included in the HTML,
// and ignore them when doing the JavaScript-based part of rendering.
// So C's HTML will have something like this:
//
// ```html
// <script src="/implementors/A/trait.Foo.js"