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rust/src/librustdoc/clean/mod.rs

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// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! This module contains the "cleaned" pieces of the AST, and the functions
//! that clean them.
pub use self::Type::*;
pub use self::Mutability::*;
pub use self::ItemEnum::*;
pub use self::TyParamBound::*;
pub use self::SelfTy::*;
pub use self::FunctionRetTy::*;
pub use self::Visibility::{Public, Inherited};
use syntax;
use rustc_target::spec::abi::Abi;
use syntax::ast::{self, AttrStyle, Ident};
use syntax::attr;
use syntax::codemap::{dummy_spanned, Spanned};
use syntax::feature_gate::UnstableFeatures;
use syntax::ptr::P;
use syntax::symbol::keywords;
use syntax::symbol::{Symbol, InternedString};
use syntax_pos::{self, DUMMY_SP, Pos, FileName};
use rustc::middle::const_val::ConstVal;
use rustc::middle::privacy::AccessLevels;
use rustc::middle::resolve_lifetime as rl;
use rustc::ty::fold::TypeFolder;
use rustc::middle::lang_items;
use rustc::mir::interpret::GlobalId;
use rustc::hir::{self, HirVec};
use rustc::hir::def::{self, Def, CtorKind};
use rustc::hir::def_id::{CrateNum, DefId, DefIndex, CRATE_DEF_INDEX, LOCAL_CRATE};
use rustc::hir::def_id::DefIndexAddressSpace;
use rustc::ty::subst::Substs;
use rustc::ty::{self, TyCtxt, Region, RegionVid, Ty, AdtKind, GenericParamCount};
use rustc::middle::stability;
use rustc::util::nodemap::{FxHashMap, FxHashSet};
use rustc_typeck::hir_ty_to_ty;
use rustc::infer::region_constraints::{RegionConstraintData, Constraint};
use std::collections::hash_map::Entry;
use std::fmt;
use std::default::Default;
use std::{mem, slice, vec};
use std::iter::{FromIterator, once};
use rustc_data_structures::sync::Lrc;
use std::rc::Rc;
use std::cell::RefCell;
use std::sync::Arc;
use std::u32;
use std::ops::Range;
use core::{self, DocContext};
use doctree;
use visit_ast;
use html::render::{cache, ExternalLocation};
use html::item_type::ItemType;
use html::markdown::markdown_links;
pub mod inline;
pub mod cfg;
mod simplify;
mod auto_trait;
use self::cfg::Cfg;
use self::auto_trait::AutoTraitFinder;
thread_local!(static MAX_DEF_ID: RefCell<FxHashMap<CrateNum, DefId>> = RefCell::new(FxHashMap()));
const FN_OUTPUT_NAME: &'static str = "Output";
// extract the stability index for a node from tcx, if possible
fn get_stability(cx: &DocContext, def_id: DefId) -> Option<Stability> {
cx.tcx.lookup_stability(def_id).clean(cx)
}
fn get_deprecation(cx: &DocContext, def_id: DefId) -> Option<Deprecation> {
cx.tcx.lookup_deprecation(def_id).clean(cx)
}
pub trait Clean<T> {
fn clean(&self, cx: &DocContext) -> T;
}
impl<T: Clean<U>, U> Clean<Vec<U>> for [T] {
fn clean(&self, cx: &DocContext) -> Vec<U> {
self.iter().map(|x| x.clean(cx)).collect()
}
}
impl<T: Clean<U>, U> Clean<U> for P<T> {
fn clean(&self, cx: &DocContext) -> U {
(**self).clean(cx)
}
}
impl<T: Clean<U>, U> Clean<U> for Rc<T> {
fn clean(&self, cx: &DocContext) -> U {
(**self).clean(cx)
}
}
impl<T: Clean<U>, U> Clean<Option<U>> for Option<T> {
fn clean(&self, cx: &DocContext) -> Option<U> {
self.as_ref().map(|v| v.clean(cx))
}
}
impl<T, U> Clean<U> for ty::Binder<T> where T: Clean<U> {
fn clean(&self, cx: &DocContext) -> U {
self.skip_binder().clean(cx)
}
}
impl<T: Clean<U>, U> Clean<Vec<U>> for P<[T]> {
fn clean(&self, cx: &DocContext) -> Vec<U> {
self.iter().map(|x| x.clean(cx)).collect()
}
}
#[derive(Clone, Debug)]
pub struct Crate {
pub name: String,
pub version: Option<String>,
pub src: FileName,
pub module: Option<Item>,
pub externs: Vec<(CrateNum, ExternalCrate)>,
pub primitives: Vec<(DefId, PrimitiveType, Attributes)>,
pub access_levels: Arc<AccessLevels<DefId>>,
// These are later on moved into `CACHEKEY`, leaving the map empty.
// Only here so that they can be filtered through the rustdoc passes.
pub external_traits: FxHashMap<DefId, Trait>,
pub masked_crates: FxHashSet<CrateNum>,
}
impl<'a, 'tcx, 'rcx> Clean<Crate> for visit_ast::RustdocVisitor<'a, 'tcx, 'rcx> {
fn clean(&self, cx: &DocContext) -> Crate {
use ::visit_lib::LibEmbargoVisitor;
{
let mut r = cx.renderinfo.borrow_mut();
r.deref_trait_did = cx.tcx.lang_items().deref_trait();
r.deref_mut_trait_did = cx.tcx.lang_items().deref_mut_trait();
r.owned_box_did = cx.tcx.lang_items().owned_box();
}
let mut externs = Vec::new();
for &cnum in cx.tcx.crates().iter() {
externs.push((cnum, cnum.clean(cx)));
// Analyze doc-reachability for extern items
LibEmbargoVisitor::new(cx).visit_lib(cnum);
}
externs.sort_by(|&(a, _), &(b, _)| a.cmp(&b));
// Clean the crate, translating the entire libsyntax AST to one that is
// understood by rustdoc.
let mut module = self.module.clean(cx);
let mut masked_crates = FxHashSet();
match module.inner {
ModuleItem(ref module) => {
for it in &module.items {
if it.is_extern_crate() && it.attrs.has_doc_flag("masked") {
masked_crates.insert(it.def_id.krate);
}
}
}
_ => unreachable!(),
}
let ExternalCrate { name, src, primitives, .. } = LOCAL_CRATE.clean(cx);
{
let m = match module.inner {
ModuleItem(ref mut m) => m,
_ => unreachable!(),
};
m.items.extend(primitives.iter().map(|&(def_id, prim, ref attrs)| {
Item {
source: Span::empty(),
name: Some(prim.to_url_str().to_string()),
attrs: attrs.clone(),
visibility: Some(Public),
stability: get_stability(cx, def_id),
deprecation: get_deprecation(cx, def_id),
def_id,
inner: PrimitiveItem(prim),
}
}));
}
let mut access_levels = cx.access_levels.borrow_mut();
let mut external_traits = cx.external_traits.borrow_mut();
Crate {
name,
version: None,
src,
module: Some(module),
externs,
primitives,
access_levels: Arc::new(mem::replace(&mut access_levels, Default::default())),
external_traits: mem::replace(&mut external_traits, Default::default()),
masked_crates,
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct ExternalCrate {
pub name: String,
pub src: FileName,
pub attrs: Attributes,
pub primitives: Vec<(DefId, PrimitiveType, Attributes)>,
}
impl Clean<ExternalCrate> for CrateNum {
fn clean(&self, cx: &DocContext) -> ExternalCrate {
let root = DefId { krate: *self, index: CRATE_DEF_INDEX };
let krate_span = cx.tcx.def_span(root);
let krate_src = cx.sess().codemap().span_to_filename(krate_span);
// Collect all inner modules which are tagged as implementations of
// primitives.
//
// Note that this loop only searches the top-level items of the crate,
// and this is intentional. If we were to search the entire crate for an
// item tagged with `#[doc(primitive)]` then we would also have to
// search the entirety of external modules for items tagged
// `#[doc(primitive)]`, which is a pretty inefficient process (decoding
// all that metadata unconditionally).
//
// In order to keep the metadata load under control, the
// `#[doc(primitive)]` feature is explicitly designed to only allow the
// primitive tags to show up as the top level items in a crate.
//
// Also note that this does not attempt to deal with modules tagged
// duplicately for the same primitive. This is handled later on when
// rendering by delegating everything to a hash map.
let as_primitive = |def: Def| {
if let Def::Mod(def_id) = def {
let attrs = cx.tcx.get_attrs(def_id).clean(cx);
let mut prim = None;
for attr in attrs.lists("doc") {
if let Some(v) = attr.value_str() {
if attr.check_name("primitive") {
prim = PrimitiveType::from_str(&v.as_str());
if prim.is_some() {
break;
}
// FIXME: should warn on unknown primitives?
}
}
}
return prim.map(|p| (def_id, p, attrs));
}
None
};
let primitives = if root.is_local() {
cx.tcx.hir.krate().module.item_ids.iter().filter_map(|&id| {
let item = cx.tcx.hir.expect_item(id.id);
match item.node {
hir::ItemMod(_) => {
as_primitive(Def::Mod(cx.tcx.hir.local_def_id(id.id)))
}
hir::ItemUse(ref path, hir::UseKind::Single)
if item.vis == hir::Visibility::Public => {
as_primitive(path.def).map(|(_, prim, attrs)| {
// Pretend the primitive is local.
(cx.tcx.hir.local_def_id(id.id), prim, attrs)
})
}
_ => None
}
}).collect()
} else {
cx.tcx.item_children(root).iter().map(|item| item.def)
.filter_map(as_primitive).collect()
};
ExternalCrate {
name: cx.tcx.crate_name(*self).to_string(),
src: krate_src,
attrs: cx.tcx.get_attrs(root).clean(cx),
primitives,
}
}
}
/// Anything with a source location and set of attributes and, optionally, a
/// name. That is, anything that can be documented. This doesn't correspond
/// directly to the AST's concept of an item; it's a strict superset.
#[derive(Clone, RustcEncodable, RustcDecodable)]
pub struct Item {
/// Stringified span
pub source: Span,
/// Not everything has a name. E.g., impls
pub name: Option<String>,
pub attrs: Attributes,
pub inner: ItemEnum,
pub visibility: Option<Visibility>,
pub def_id: DefId,
pub stability: Option<Stability>,
pub deprecation: Option<Deprecation>,
}
impl fmt::Debug for Item {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
let fake = MAX_DEF_ID.with(|m| m.borrow().get(&self.def_id.krate)
.map(|id| self.def_id >= *id).unwrap_or(false));
let def_id: &fmt::Debug = if fake { &"**FAKE**" } else { &self.def_id };
fmt.debug_struct("Item")
.field("source", &self.source)
.field("name", &self.name)
.field("attrs", &self.attrs)
.field("inner", &self.inner)
.field("visibility", &self.visibility)
.field("def_id", def_id)
.field("stability", &self.stability)
.field("deprecation", &self.deprecation)
.finish()
}
}
impl Item {
/// Finds the `doc` attribute as a NameValue and returns the corresponding
/// value found.
pub fn doc_value<'a>(&'a self) -> Option<&'a str> {
self.attrs.doc_value()
}
/// Finds all `doc` attributes as NameValues and returns their corresponding values, joined
/// with newlines.
pub fn collapsed_doc_value(&self) -> Option<String> {
self.attrs.collapsed_doc_value()
}
pub fn links(&self) -> Vec<(String, String)> {
self.attrs.links(&self.def_id.krate)
}
pub fn is_crate(&self) -> bool {
match self.inner {
StrippedItem(box ModuleItem(Module { is_crate: true, ..})) |
ModuleItem(Module { is_crate: true, ..}) => true,
_ => false,
}
}
pub fn is_mod(&self) -> bool {
self.type_() == ItemType::Module
}
pub fn is_trait(&self) -> bool {
self.type_() == ItemType::Trait
}
pub fn is_struct(&self) -> bool {
self.type_() == ItemType::Struct
}
pub fn is_enum(&self) -> bool {
self.type_() == ItemType::Enum
}
pub fn is_fn(&self) -> bool {
self.type_() == ItemType::Function
}
pub fn is_associated_type(&self) -> bool {
self.type_() == ItemType::AssociatedType
}
pub fn is_associated_const(&self) -> bool {
self.type_() == ItemType::AssociatedConst
}
pub fn is_method(&self) -> bool {
self.type_() == ItemType::Method
}
pub fn is_ty_method(&self) -> bool {
self.type_() == ItemType::TyMethod
}
pub fn is_typedef(&self) -> bool {
self.type_() == ItemType::Typedef
}
pub fn is_primitive(&self) -> bool {
self.type_() == ItemType::Primitive
}
pub fn is_union(&self) -> bool {
self.type_() == ItemType::Union
}
pub fn is_import(&self) -> bool {
self.type_() == ItemType::Import
}
pub fn is_extern_crate(&self) -> bool {
self.type_() == ItemType::ExternCrate
}
pub fn is_stripped(&self) -> bool {
match self.inner { StrippedItem(..) => true, _ => false }
}
pub fn has_stripped_fields(&self) -> Option<bool> {
match self.inner {
StructItem(ref _struct) => Some(_struct.fields_stripped),
UnionItem(ref union) => Some(union.fields_stripped),
VariantItem(Variant { kind: VariantKind::Struct(ref vstruct)} ) => {
Some(vstruct.fields_stripped)
},
_ => None,
}
}
pub fn stability_class(&self) -> Option<String> {
self.stability.as_ref().and_then(|ref s| {
let mut classes = Vec::with_capacity(2);
if s.level == stability::Unstable {
classes.push("unstable");
}
if !s.deprecated_since.is_empty() {
classes.push("deprecated");
}
if classes.len() != 0 {
Some(classes.join(" "))
} else {
None
}
})
}
pub fn stable_since(&self) -> Option<&str> {
self.stability.as_ref().map(|s| &s.since[..])
}
/// Returns a documentation-level item type from the item.
pub fn type_(&self) -> ItemType {
ItemType::from(self)
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub enum ItemEnum {
ExternCrateItem(String, Option<String>),
ImportItem(Import),
StructItem(Struct),
UnionItem(Union),
EnumItem(Enum),
FunctionItem(Function),
ModuleItem(Module),
TypedefItem(Typedef, bool /* is associated type */),
StaticItem(Static),
ConstantItem(Constant),
TraitItem(Trait),
ImplItem(Impl),
/// A method signature only. Used for required methods in traits (ie,
/// non-default-methods).
TyMethodItem(TyMethod),
/// A method with a body.
MethodItem(Method),
StructFieldItem(Type),
VariantItem(Variant),
/// `fn`s from an extern block
ForeignFunctionItem(Function),
/// `static`s from an extern block
ForeignStaticItem(Static),
/// `type`s from an extern block
ForeignTypeItem,
MacroItem(Macro),
PrimitiveItem(PrimitiveType),
AssociatedConstItem(Type, Option<String>),
AssociatedTypeItem(Vec<TyParamBound>, Option<Type>),
/// An item that has been stripped by a rustdoc pass
StrippedItem(Box<ItemEnum>),
}
impl ItemEnum {
pub fn generics(&self) -> Option<&Generics> {
Some(match *self {
ItemEnum::StructItem(ref s) => &s.generics,
ItemEnum::EnumItem(ref e) => &e.generics,
ItemEnum::FunctionItem(ref f) => &f.generics,
ItemEnum::TypedefItem(ref t, _) => &t.generics,
ItemEnum::TraitItem(ref t) => &t.generics,
ItemEnum::ImplItem(ref i) => &i.generics,
ItemEnum::TyMethodItem(ref i) => &i.generics,
ItemEnum::MethodItem(ref i) => &i.generics,
ItemEnum::ForeignFunctionItem(ref f) => &f.generics,
_ => return None,
})
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Module {
pub items: Vec<Item>,
pub is_crate: bool,
}
impl Clean<Item> for doctree::Module {
fn clean(&self, cx: &DocContext) -> Item {
let name = if self.name.is_some() {
self.name.unwrap().clean(cx)
} else {
"".to_string()
};
// maintain a stack of mod ids, for doc comment path resolution
// but we also need to resolve the module's own docs based on whether its docs were written
// inside or outside the module, so check for that
let attrs = if self.attrs.iter()
.filter(|a| a.check_name("doc"))
.next()
.map_or(true, |a| a.style == AttrStyle::Inner) {
// inner doc comment, use the module's own scope for resolution
cx.mod_ids.borrow_mut().push(self.id);
self.attrs.clean(cx)
} else {
// outer doc comment, use its parent's scope
let attrs = self.attrs.clean(cx);
cx.mod_ids.borrow_mut().push(self.id);
attrs
};
let mut items: Vec<Item> = vec![];
items.extend(self.extern_crates.iter().map(|x| x.clean(cx)));
items.extend(self.imports.iter().flat_map(|x| x.clean(cx)));
items.extend(self.structs.iter().flat_map(|x| x.clean(cx)));
items.extend(self.unions.iter().flat_map(|x| x.clean(cx)));
items.extend(self.enums.iter().flat_map(|x| x.clean(cx)));
items.extend(self.fns.iter().map(|x| x.clean(cx)));
items.extend(self.foreigns.iter().flat_map(|x| x.clean(cx)));
items.extend(self.mods.iter().map(|x| x.clean(cx)));
items.extend(self.typedefs.iter().map(|x| x.clean(cx)));
items.extend(self.statics.iter().map(|x| x.clean(cx)));
items.extend(self.constants.iter().map(|x| x.clean(cx)));
items.extend(self.traits.iter().map(|x| x.clean(cx)));
items.extend(self.impls.iter().flat_map(|x| x.clean(cx)));
items.extend(self.macros.iter().map(|x| x.clean(cx)));
cx.mod_ids.borrow_mut().pop();
// determine if we should display the inner contents or
// the outer `mod` item for the source code.
let whence = {
let cm = cx.sess().codemap();
let outer = cm.lookup_char_pos(self.where_outer.lo());
let inner = cm.lookup_char_pos(self.where_inner.lo());
if outer.file.start_pos == inner.file.start_pos {
// mod foo { ... }
self.where_outer
} else {
// mod foo; (and a separate FileMap for the contents)
self.where_inner
}
};
Item {
name: Some(name),
attrs,
source: whence.clean(cx),
visibility: self.vis.clean(cx),
stability: self.stab.clean(cx),
deprecation: self.depr.clean(cx),
def_id: cx.tcx.hir.local_def_id(self.id),
inner: ModuleItem(Module {
is_crate: self.is_crate,
items,
})
}
}
}
pub struct ListAttributesIter<'a> {
attrs: slice::Iter<'a, ast::Attribute>,
current_list: vec::IntoIter<ast::NestedMetaItem>,
name: &'a str
}
impl<'a> Iterator for ListAttributesIter<'a> {
type Item = ast::NestedMetaItem;
fn next(&mut self) -> Option<Self::Item> {
if let Some(nested) = self.current_list.next() {
return Some(nested);
}
for attr in &mut self.attrs {
if let Some(list) = attr.meta_item_list() {
if attr.check_name(self.name) {
self.current_list = list.into_iter();
if let Some(nested) = self.current_list.next() {
return Some(nested);
}
}
}
}
None
}
fn size_hint(&self) -> (usize, Option<usize>) {
let lower = self.current_list.len();
(lower, None)
}
}
pub trait AttributesExt {
/// Finds an attribute as List and returns the list of attributes nested inside.
fn lists<'a>(&'a self, name: &'a str) -> ListAttributesIter<'a>;
}
impl AttributesExt for [ast::Attribute] {
fn lists<'a>(&'a self, name: &'a str) -> ListAttributesIter<'a> {
ListAttributesIter {
attrs: self.iter(),
current_list: Vec::new().into_iter(),
name,
}
}
}
pub trait NestedAttributesExt {
/// Returns whether the attribute list contains a specific `Word`
fn has_word(self, word: &str) -> bool;
}
impl<I: IntoIterator<Item=ast::NestedMetaItem>> NestedAttributesExt for I {
fn has_word(self, word: &str) -> bool {
self.into_iter().any(|attr| attr.is_word() && attr.check_name(word))
}
}
/// A portion of documentation, extracted from a `#[doc]` attribute.
///
/// Each variant contains the line number within the complete doc-comment where the fragment
/// starts, as well as the Span where the corresponding doc comment or attribute is located.
///
/// Included files are kept separate from inline doc comments so that proper line-number
/// information can be given when a doctest fails. Sugared doc comments and "raw" doc comments are
/// kept separate because of issue #42760.
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub enum DocFragment {
// FIXME #44229 (misdreavus): sugared and raw doc comments can be brought back together once
// hoedown is completely removed from rustdoc.
/// A doc fragment created from a `///` or `//!` doc comment.
SugaredDoc(usize, syntax_pos::Span, String),
/// A doc fragment created from a "raw" `#[doc=""]` attribute.
RawDoc(usize, syntax_pos::Span, String),
/// A doc fragment created from a `#[doc(include="filename")]` attribute. Contains both the
/// given filename and the file contents.
Include(usize, syntax_pos::Span, String, String),
}
impl DocFragment {
pub fn as_str(&self) -> &str {
match *self {
DocFragment::SugaredDoc(_, _, ref s) => &s[..],
DocFragment::RawDoc(_, _, ref s) => &s[..],
DocFragment::Include(_, _, _, ref s) => &s[..],
}
}
pub fn span(&self) -> syntax_pos::Span {
match *self {
DocFragment::SugaredDoc(_, span, _) |
DocFragment::RawDoc(_, span, _) |
DocFragment::Include(_, span, _, _) => span,
}
}
}
impl<'a> FromIterator<&'a DocFragment> for String {
fn from_iter<T>(iter: T) -> Self
where
T: IntoIterator<Item = &'a DocFragment>
{
iter.into_iter().fold(String::new(), |mut acc, frag| {
if !acc.is_empty() {
acc.push('\n');
}
match *frag {
DocFragment::SugaredDoc(_, _, ref docs)
| DocFragment::RawDoc(_, _, ref docs)
| DocFragment::Include(_, _, _, ref docs) =>
acc.push_str(docs),
}
acc
})
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Default, Hash)]
pub struct Attributes {
pub doc_strings: Vec<DocFragment>,
pub other_attrs: Vec<ast::Attribute>,
pub cfg: Option<Arc<Cfg>>,
pub span: Option<syntax_pos::Span>,
/// map from Rust paths to resolved defs and potential URL fragments
pub links: Vec<(String, Option<DefId>, Option<String>)>,
}
impl Attributes {
/// Extracts the content from an attribute `#[doc(cfg(content))]`.
fn extract_cfg(mi: &ast::MetaItem) -> Option<&ast::MetaItem> {
use syntax::ast::NestedMetaItemKind::MetaItem;
if let ast::MetaItemKind::List(ref nmis) = mi.node {
if nmis.len() == 1 {
if let MetaItem(ref cfg_mi) = nmis[0].node {
if cfg_mi.check_name("cfg") {
if let ast::MetaItemKind::List(ref cfg_nmis) = cfg_mi.node {
if cfg_nmis.len() == 1 {
if let MetaItem(ref content_mi) = cfg_nmis[0].node {
return Some(content_mi);
}
}
}
}
}
}
}
None
}
/// Reads a `MetaItem` from within an attribute, looks for whether it is a
/// `#[doc(include="file")]`, and returns the filename and contents of the file as loaded from
/// its expansion.
fn extract_include(mi: &ast::MetaItem)
-> Option<(String, String)>
{
mi.meta_item_list().and_then(|list| {
for meta in list {
if meta.check_name("include") {
// the actual compiled `#[doc(include="filename")]` gets expanded to
// `#[doc(include(file="filename", contents="file contents")]` so we need to
// look for that instead
return meta.meta_item_list().and_then(|list| {
let mut filename: Option<String> = None;
let mut contents: Option<String> = None;
for it in list {
if it.check_name("file") {
if let Some(name) = it.value_str() {
filename = Some(name.to_string());
}
} else if it.check_name("contents") {
if let Some(docs) = it.value_str() {
contents = Some(docs.to_string());
}
}
}
if let (Some(filename), Some(contents)) = (filename, contents) {
Some((filename, contents))
} else {
None
}
});
}
}
None
})
}
pub fn has_doc_flag(&self, flag: &str) -> bool {
for attr in &self.other_attrs {
if !attr.check_name("doc") { continue; }
if let Some(items) = attr.meta_item_list() {
if items.iter().filter_map(|i| i.meta_item()).any(|it| it.check_name(flag)) {
return true;
}
}
}
false
}
pub fn from_ast(diagnostic: &::errors::Handler,
attrs: &[ast::Attribute]) -> Attributes {
let mut doc_strings = vec![];
let mut sp = None;
let mut cfg = Cfg::True;
let mut doc_line = 0;
let other_attrs = attrs.iter().filter_map(|attr| {
attr.with_desugared_doc(|attr| {
if attr.check_name("doc") {
if let Some(mi) = attr.meta() {
if let Some(value) = mi.value_str() {
// Extracted #[doc = "..."]
let value = value.to_string();
let line = doc_line;
doc_line += value.lines().count();
if attr.is_sugared_doc {
doc_strings.push(DocFragment::SugaredDoc(line, attr.span, value));
} else {
doc_strings.push(DocFragment::RawDoc(line, attr.span, value));
}
if sp.is_none() {
sp = Some(attr.span);
}
return None;
} else if let Some(cfg_mi) = Attributes::extract_cfg(&mi) {
// Extracted #[doc(cfg(...))]
match Cfg::parse(cfg_mi) {
Ok(new_cfg) => cfg &= new_cfg,
Err(e) => diagnostic.span_err(e.span, e.msg),
}
return None;
} else if let Some((filename, contents)) = Attributes::extract_include(&mi)
{
let line = doc_line;
doc_line += contents.lines().count();
doc_strings.push(DocFragment::Include(line,
attr.span,
filename,
contents));
}
}
}
Some(attr.clone())
})
}).collect();
// treat #[target_feature(enable = "feat")] attributes as if they were
// #[doc(cfg(target_feature = "feat"))] attributes as well
for attr in attrs.lists("target_feature") {
if attr.check_name("enable") {
if let Some(feat) = attr.value_str() {
let meta = attr::mk_name_value_item_str(Ident::from_str("target_feature"),
dummy_spanned(feat));
if let Ok(feat_cfg) = Cfg::parse(&meta) {
cfg &= feat_cfg;
}
}
}
}
Attributes {
doc_strings,
other_attrs,
cfg: if cfg == Cfg::True { None } else { Some(Arc::new(cfg)) },
span: sp,
links: vec![],
}
}
/// Finds the `doc` attribute as a NameValue and returns the corresponding
/// value found.
pub fn doc_value<'a>(&'a self) -> Option<&'a str> {
self.doc_strings.first().map(|s| s.as_str())
}
/// Finds all `doc` attributes as NameValues and returns their corresponding values, joined
/// with newlines.
pub fn collapsed_doc_value(&self) -> Option<String> {
if !self.doc_strings.is_empty() {
Some(self.doc_strings.iter().collect())
} else {
None
}
}
/// Get links as a vector
///
/// Cache must be populated before call
pub fn links(&self, krate: &CrateNum) -> Vec<(String, String)> {
use html::format::href;
self.links.iter().filter_map(|&(ref s, did, ref fragment)| {
match did {
Some(did) => {
if let Some((mut href, ..)) = href(did) {
if let Some(ref fragment) = *fragment {
href.push_str("#");
href.push_str(fragment);
}
Some((s.clone(), href))
} else {
None
}
}
None => {
if let Some(ref fragment) = *fragment {
let cache = cache();
let url = match cache.extern_locations.get(krate) {
Some(&(_, ref src, ExternalLocation::Local)) =>
src.to_str().expect("invalid file path"),
Some(&(_, _, ExternalLocation::Remote(ref s))) => s,
Some(&(_, _, ExternalLocation::Unknown)) | None =>
"https://doc.rust-lang.org/nightly",
};
// This is a primitive so the url is done "by hand".
Some((s.clone(),
format!("{}{}std/primitive.{}.html",
url,
if !url.ends_with('/') { "/" } else { "" },
fragment)))
} else {
panic!("This isn't a primitive?!");
}
}
}
}).collect()
}
}
impl AttributesExt for Attributes {
fn lists<'a>(&'a self, name: &'a str) -> ListAttributesIter<'a> {
self.other_attrs.lists(name)
}
}
/// Given a def, returns its name and disambiguator
/// for a value namespace
///
/// Returns None for things which cannot be ambiguous since
/// they exist in both namespaces (structs and modules)
fn value_ns_kind(def: Def, path_str: &str) -> Option<(&'static str, String)> {
match def {
// structs, variants, and mods exist in both namespaces. skip them
Def::StructCtor(..) | Def::Mod(..) | Def::Variant(..) | Def::VariantCtor(..) => None,
Def::Fn(..)
=> Some(("function", format!("{}()", path_str))),
Def::Method(..)
=> Some(("method", format!("{}()", path_str))),
Def::Const(..)
=> Some(("const", format!("const@{}", path_str))),
Def::Static(..)
=> Some(("static", format!("static@{}", path_str))),
_ => Some(("value", format!("value@{}", path_str))),
}
}
/// Given a def, returns its name, the article to be used, and a disambiguator
/// for the type namespace
fn type_ns_kind(def: Def, path_str: &str) -> (&'static str, &'static str, String) {
let (kind, article) = match def {
// we can still have non-tuple structs
Def::Struct(..) => ("struct", "a"),
Def::Enum(..) => ("enum", "an"),
Def::Trait(..) => ("trait", "a"),
Def::Union(..) => ("union", "a"),
_ => ("type", "a"),
};
(kind, article, format!("{}@{}", kind, path_str))
}
fn span_of_attrs(attrs: &Attributes) -> syntax_pos::Span {
if attrs.doc_strings.is_empty() {
return DUMMY_SP;
}
let start = attrs.doc_strings[0].span();
let end = attrs.doc_strings.last().unwrap().span();
start.to(end)
}
fn ambiguity_error(cx: &DocContext, attrs: &Attributes,
path_str: &str,
article1: &str, kind1: &str, disambig1: &str,
article2: &str, kind2: &str, disambig2: &str) {
let sp = span_of_attrs(attrs);
cx.sess()
.struct_span_warn(sp,
&format!("`{}` is both {} {} and {} {}",
path_str, article1, kind1,
article2, kind2))
.help(&format!("try `{}` if you want to select the {}, \
or `{}` if you want to \
select the {}",
disambig1, kind1, disambig2,
kind2))
.emit();
}
/// Given an enum variant's def, return the def of its enum and the associated fragment
fn handle_variant(cx: &DocContext, def: Def) -> Result<(Def, Option<String>), ()> {
use rustc::ty::DefIdTree;
let parent = if let Some(parent) = cx.tcx.parent(def.def_id()) {
parent
} else {
return Err(())
};
let parent_def = Def::Enum(parent);
let variant = cx.tcx.expect_variant_def(def);
Ok((parent_def, Some(format!("{}.v", variant.name))))
}
const PRIMITIVES: &[(&str, Def)] = &[
("u8", Def::PrimTy(hir::PrimTy::TyUint(syntax::ast::UintTy::U8))),
("u16", Def::PrimTy(hir::PrimTy::TyUint(syntax::ast::UintTy::U16))),
("u32", Def::PrimTy(hir::PrimTy::TyUint(syntax::ast::UintTy::U32))),
("u64", Def::PrimTy(hir::PrimTy::TyUint(syntax::ast::UintTy::U64))),
("u128", Def::PrimTy(hir::PrimTy::TyUint(syntax::ast::UintTy::U128))),
("usize", Def::PrimTy(hir::PrimTy::TyUint(syntax::ast::UintTy::Usize))),
("i8", Def::PrimTy(hir::PrimTy::TyInt(syntax::ast::IntTy::I8))),
("i16", Def::PrimTy(hir::PrimTy::TyInt(syntax::ast::IntTy::I16))),
("i32", Def::PrimTy(hir::PrimTy::TyInt(syntax::ast::IntTy::I32))),
("i64", Def::PrimTy(hir::PrimTy::TyInt(syntax::ast::IntTy::I64))),
("i128", Def::PrimTy(hir::PrimTy::TyInt(syntax::ast::IntTy::I128))),
("isize", Def::PrimTy(hir::PrimTy::TyInt(syntax::ast::IntTy::Isize))),
("f32", Def::PrimTy(hir::PrimTy::TyFloat(syntax::ast::FloatTy::F32))),
("f64", Def::PrimTy(hir::PrimTy::TyFloat(syntax::ast::FloatTy::F64))),
("str", Def::PrimTy(hir::PrimTy::TyStr)),
("bool", Def::PrimTy(hir::PrimTy::TyBool)),
("char", Def::PrimTy(hir::PrimTy::TyChar)),
];
fn is_primitive(path_str: &str, is_val: bool) -> Option<Def> {
if is_val {
None
} else {
PRIMITIVES.iter().find(|x| x.0 == path_str).map(|x| x.1)
}
}
/// Resolve a given string as a path, along with whether or not it is
/// in the value namespace. Also returns an optional URL fragment in the case
/// of variants and methods
fn resolve(cx: &DocContext, path_str: &str, is_val: bool) -> Result<(Def, Option<String>), ()> {
// In case we're in a module, try to resolve the relative
// path
if let Some(id) = cx.mod_ids.borrow().last() {
let result = cx.resolver.borrow_mut()
.with_scope(*id,
|resolver| {
resolver.resolve_str_path_error(DUMMY_SP,
&path_str, is_val)
});
if let Ok(result) = result {
// In case this is a trait item, skip the
// early return and try looking for the trait
let value = match result.def {
Def::Method(_) | Def::AssociatedConst(_) => true,
Def::AssociatedTy(_) => false,
Def::Variant(_) => return handle_variant(cx, result.def),
// not a trait item, just return what we found
_ => return Ok((result.def, None))
};
if value != is_val {
return Err(())
}
} else if let Some(prim) = is_primitive(path_str, is_val) {
return Ok((prim, Some(path_str.to_owned())))
} else {
// If resolution failed, it may still be a method
// because methods are not handled by the resolver
// If so, bail when we're not looking for a value
if !is_val {
return Err(())
}
}
// Try looking for methods and associated items
let mut split = path_str.rsplitn(2, "::");
let mut item_name = if let Some(first) = split.next() {
first
} else {
return Err(())
};
let mut path = if let Some(second) = split.next() {
second
} else {
return Err(())
};
let ty = cx.resolver.borrow_mut()
.with_scope(*id,
|resolver| {
resolver.resolve_str_path_error(DUMMY_SP, &path, false)
})?;
match ty.def {
Def::Struct(did) | Def::Union(did) | Def::Enum(did) | Def::TyAlias(did) => {
let item = cx.tcx.inherent_impls(did).iter()
.flat_map(|imp| cx.tcx.associated_items(*imp))
.find(|item| item.name == item_name);
if let Some(item) = item {
let out = match item.kind {
ty::AssociatedKind::Method if is_val => "method",
ty::AssociatedKind::Const if is_val => "associatedconstant",
_ => return Err(())
};
Ok((ty.def, Some(format!("{}.{}", out, item_name))))
} else {
let is_enum = match ty.def {
Def::Enum(_) => true,
_ => false,
};
let elem = if is_enum {
cx.tcx.adt_def(did).all_fields().find(|item| item.ident.name == item_name)
} else {
cx.tcx.adt_def(did)
.non_enum_variant()
.fields
.iter()
.find(|item| item.ident.name == item_name)
};
if let Some(item) = elem {
Ok((ty.def,
Some(format!("{}.{}",
if is_enum { "variant" } else { "structfield" },
item.ident))))
} else {
Err(())
}
}
}
Def::Trait(did) => {
let item = cx.tcx.associated_item_def_ids(did).iter()
.map(|item| cx.tcx.associated_item(*item))
.find(|item| item.name == item_name);
if let Some(item) = item {
let kind = match item.kind {
ty::AssociatedKind::Const if is_val => "associatedconstant",
ty::AssociatedKind::Type if !is_val => "associatedtype",
ty::AssociatedKind::Method if is_val => {
if item.defaultness.has_value() {
"method"
} else {
"tymethod"
}
}
_ => return Err(())
};
Ok((ty.def, Some(format!("{}.{}", kind, item_name))))
} else {
Err(())
}
}
_ => Err(())
}
} else {
Err(())
}
}
/// Resolve a string as a macro
fn macro_resolve(cx: &DocContext, path_str: &str) -> Option<Def> {
use syntax::ext::base::{MacroKind, SyntaxExtension};
use syntax::ext::hygiene::Mark;
let segment = ast::PathSegment::from_ident(Ident::from_str(path_str));
let path = ast::Path { segments: vec![segment], span: DUMMY_SP };
let mut resolver = cx.resolver.borrow_mut();
let mark = Mark::root();
let res = resolver
.resolve_macro_to_def_inner(mark, &path, MacroKind::Bang, false);
if let Ok(def) = res {
if let SyntaxExtension::DeclMacro(..) = *resolver.get_macro(def) {
Some(def)
} else {
None
}
} else if let Some(def) = resolver.all_macros.get(&Symbol::intern(path_str)) {
Some(*def)
} else {
None
}
}
#[derive(Debug)]
enum PathKind {
/// can be either value or type, not a macro
Unknown,
/// macro
Macro,
/// values, functions, consts, statics, everything in the value namespace
Value,
/// types, traits, everything in the type namespace
Type,
}
fn resolution_failure(
cx: &DocContext,
attrs: &Attributes,
path_str: &str,
dox: &str,
link_range: Option<Range<usize>>,
) {
let sp = span_of_attrs(attrs);
let msg = format!("`[{}]` cannot be resolved, ignoring it...", path_str);
let code_dox = sp.to_src(cx);
// The whitespace before the `///` to properly find the original span location.
let dox_leading_whitespace = code_dox.lines().nth(1)
.map(|x| x.len() - x.trim_left().len()).unwrap_or(0);
let doc_comment_padding = 3;
let mut diag = if let Some(link_range) = link_range {
// blah blah blah\nblah\nblah [blah] blah blah\nblah blah
// ^ ~~~~~~
// | link_range
// last_new_line_offset
let line_offset = dox[..link_range.start].lines().count();
let code_dox_len = if line_offset <= 1 {
// The span starts in the `///`, so we don't have to account for the leading whitespace
doc_comment_padding
} else {
// The first `///`
doc_comment_padding +
// Each subsequent leading whitespace and `///`
(doc_comment_padding + dox_leading_whitespace)
// The line position inside the doc string
* (line_offset - 1)
};
// Extract the specific span
let lo = sp.lo() + syntax_pos::BytePos((link_range.start + code_dox_len) as u32);
let hi = lo + syntax_pos::BytePos(link_range.len() as u32);
let sp = sp.with_lo(lo).with_hi(hi);
let mut diag = cx.sess().struct_span_warn(sp, &msg);
diag.span_label(sp, "cannot be resolved, ignoring");
diag
} else {
cx.sess().struct_span_warn(sp, &msg)
};
diag.emit();
}
impl Clean<Attributes> for [ast::Attribute] {
fn clean(&self, cx: &DocContext) -> Attributes {
let mut attrs = Attributes::from_ast(cx.sess().diagnostic(), self);
if UnstableFeatures::from_environment().is_nightly_build() {
let dox = attrs.collapsed_doc_value().unwrap_or_else(String::new);
for (ori_link, link_range) in markdown_links(&dox) {
// bail early for real links
if ori_link.contains('/') {
continue;
}
let link = ori_link.replace("`", "");
let (def, fragment) = {
let mut kind = PathKind::Unknown;
let path_str = if let Some(prefix) =
["struct@", "enum@", "type@",
"trait@", "union@"].iter()
.find(|p| link.starts_with(**p)) {
kind = PathKind::Type;
link.trim_left_matches(prefix)
} else if let Some(prefix) =
["const@", "static@",
"value@", "function@", "mod@",
"fn@", "module@", "method@"]
.iter().find(|p| link.starts_with(**p)) {
kind = PathKind::Value;
link.trim_left_matches(prefix)
} else if link.ends_with("()") {
kind = PathKind::Value;
link.trim_right_matches("()")
} else if link.starts_with("macro@") {
kind = PathKind::Macro;
link.trim_left_matches("macro@")
} else if link.ends_with('!') {
kind = PathKind::Macro;
link.trim_right_matches('!')
} else {
&link[..]
}.trim();
if path_str.contains(|ch: char| !(ch.is_alphanumeric() ||
ch == ':' || ch == '_')) {
continue;
}
match kind {
PathKind::Value => {
if let Ok(def) = resolve(cx, path_str, true) {
def
} else {
resolution_failure(cx, &attrs, path_str, &dox, link_range);
// this could just be a normal link or a broken link
// we could potentially check if something is
// "intra-doc-link-like" and warn in that case
continue;
}
}
PathKind::Type => {
if let Ok(def) = resolve(cx, path_str, false) {
def
} else {
resolution_failure(cx, &attrs, path_str, &dox, link_range);
// this could just be a normal link
continue;
}
}
PathKind::Unknown => {
// try everything!
if let Some(macro_def) = macro_resolve(cx, path_str) {
if let Ok(type_def) = resolve(cx, path_str, false) {
let (type_kind, article, type_disambig)
= type_ns_kind(type_def.0, path_str);
ambiguity_error(cx, &attrs, path_str,
article, type_kind, &type_disambig,
"a", "macro", &format!("macro@{}", path_str));
continue;
} else if let Ok(value_def) = resolve(cx, path_str, true) {
let (value_kind, value_disambig)
= value_ns_kind(value_def.0, path_str)
.expect("struct and mod cases should have been \
caught in previous branch");
ambiguity_error(cx, &attrs, path_str,
"a", value_kind, &value_disambig,
"a", "macro", &format!("macro@{}", path_str));
}
(macro_def, None)
} else if let Ok(type_def) = resolve(cx, path_str, false) {
// It is imperative we search for not-a-value first
// Otherwise we will find struct ctors for when we are looking
// for structs, and the link won't work.
// if there is something in both namespaces
if let Ok(value_def) = resolve(cx, path_str, true) {
let kind = value_ns_kind(value_def.0, path_str);
if let Some((value_kind, value_disambig)) = kind {
let (type_kind, article, type_disambig)
= type_ns_kind(type_def.0, path_str);
ambiguity_error(cx, &attrs, path_str,
article, type_kind, &type_disambig,
"a", value_kind, &value_disambig);
continue;
}
}
type_def
} else if let Ok(value_def) = resolve(cx, path_str, true) {
value_def
} else {
resolution_failure(cx, &attrs, path_str, &dox, link_range);
// this could just be a normal link
continue;
}
}
PathKind::Macro => {
if let Some(def) = macro_resolve(cx, path_str) {
(def, None)
} else {
resolution_failure(cx, &attrs, path_str, &dox, link_range);
continue
}
}
}
};
if let Def::PrimTy(_) = def {
attrs.links.push((ori_link, None, fragment));
} else {
let id = register_def(cx, def);
attrs.links.push((ori_link, Some(id), fragment));
}
}
cx.sess().abort_if_errors();
}
attrs
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub struct TyParam {
pub name: String,
pub did: DefId,
pub bounds: Vec<TyParamBound>,
pub default: Option<Type>,
pub synthetic: Option<hir::SyntheticTyParamKind>,
}
impl Clean<TyParam> for hir::TyParam {
fn clean(&self, cx: &DocContext) -> TyParam {
TyParam {
name: self.name.clean(cx),
did: cx.tcx.hir.local_def_id(self.id),
bounds: self.bounds.clean(cx),
default: self.default.clean(cx),
synthetic: self.synthetic,
}
}
}
impl<'tcx> Clean<TyParam> for ty::GenericParamDef {
fn clean(&self, cx: &DocContext) -> TyParam {
cx.renderinfo.borrow_mut().external_typarams.insert(self.def_id, self.name.clean(cx));
let has_default = match self.kind {
ty::GenericParamDefKind::Type { has_default, .. } => has_default,
_ => panic!("tried to convert a non-type GenericParamDef as a type")
};
TyParam {
name: self.name.clean(cx),
did: self.def_id,
bounds: vec![], // these are filled in from the where-clauses
default: if has_default {
Some(cx.tcx.type_of(self.def_id).clean(cx))
} else {
None
},
synthetic: None,
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub enum TyParamBound {
RegionBound(Lifetime),
TraitBound(PolyTrait, hir::TraitBoundModifier)
}
impl TyParamBound {
fn maybe_sized(cx: &DocContext) -> TyParamBound {
let did = cx.tcx.require_lang_item(lang_items::SizedTraitLangItem);
let empty = cx.tcx.intern_substs(&[]);
let path = external_path(cx, &cx.tcx.item_name(did).as_str(),
Some(did), false, vec![], empty);
inline::record_extern_fqn(cx, did, TypeKind::Trait);
TraitBound(PolyTrait {
trait_: ResolvedPath {
path,
typarams: None,
did,
is_generic: false,
},
generic_params: Vec::new(),
}, hir::TraitBoundModifier::Maybe)
}
fn is_sized_bound(&self, cx: &DocContext) -> bool {
use rustc::hir::TraitBoundModifier as TBM;
if let TyParamBound::TraitBound(PolyTrait { ref trait_, .. }, TBM::None) = *self {
if trait_.def_id() == cx.tcx.lang_items().sized_trait() {
return true;
}
}
false
}
fn get_poly_trait(&self) -> Option<PolyTrait> {
if let TyParamBound::TraitBound(ref p, _) = *self {
return Some(p.clone())
}
None
}
fn get_trait_type(&self) -> Option<Type> {
if let TyParamBound::TraitBound(PolyTrait { ref trait_, .. }, _) = *self {
return Some(trait_.clone());
}
None
}
}
impl Clean<TyParamBound> for hir::TyParamBound {
fn clean(&self, cx: &DocContext) -> TyParamBound {
match *self {
hir::RegionTyParamBound(lt) => RegionBound(lt.clean(cx)),
hir::TraitTyParamBound(ref t, modifier) => TraitBound(t.clean(cx), modifier),
}
}
}
fn external_path_params(cx: &DocContext, trait_did: Option<DefId>, has_self: bool,
bindings: Vec<TypeBinding>, substs: &Substs) -> PathParameters {
let lifetimes = substs.regions().filter_map(|v| v.clean(cx)).collect();
let types = substs.types().skip(has_self as usize).collect::<Vec<_>>();
match trait_did {
// Attempt to sugar an external path like Fn<(A, B,), C> to Fn(A, B) -> C
Some(did) if cx.tcx.lang_items().fn_trait_kind(did).is_some() => {
assert_eq!(types.len(), 1);
let inputs = match types[0].sty {
ty::TyTuple(ref tys) => tys.iter().map(|t| t.clean(cx)).collect(),
_ => {
return PathParameters::AngleBracketed {
lifetimes,
types: types.clean(cx),
bindings,
}
}
};
let output = None;
// FIXME(#20299) return type comes from a projection now
// match types[1].sty {
// ty::TyTuple(ref v) if v.is_empty() => None, // -> ()
// _ => Some(types[1].clean(cx))
// };
PathParameters::Parenthesized {
inputs,
output,
}
},
_ => {
PathParameters::AngleBracketed {
lifetimes,
types: types.clean(cx),
bindings,
}
}
}
}
// trait_did should be set to a trait's DefId if called on a TraitRef, in order to sugar
// from Fn<(A, B,), C> to Fn(A, B) -> C
fn external_path(cx: &DocContext, name: &str, trait_did: Option<DefId>, has_self: bool,
bindings: Vec<TypeBinding>, substs: &Substs) -> Path {
Path {
global: false,
def: Def::Err,
segments: vec![PathSegment {
name: name.to_string(),
params: external_path_params(cx, trait_did, has_self, bindings, substs)
}],
}
}
impl<'a, 'tcx> Clean<TyParamBound> for (&'a ty::TraitRef<'tcx>, Vec<TypeBinding>) {
fn clean(&self, cx: &DocContext) -> TyParamBound {
let (trait_ref, ref bounds) = *self;
inline::record_extern_fqn(cx, trait_ref.def_id, TypeKind::Trait);
let path = external_path(cx, &cx.tcx.item_name(trait_ref.def_id).as_str(),
Some(trait_ref.def_id), true, bounds.clone(), trait_ref.substs);
debug!("ty::TraitRef\n subst: {:?}\n", trait_ref.substs);
// collect any late bound regions
let mut late_bounds = vec![];
for ty_s in trait_ref.input_types().skip(1) {
if let ty::TyTuple(ts) = ty_s.sty {
for &ty_s in ts {
if let ty::TyRef(ref reg, _, _) = ty_s.sty {
if let &ty::RegionKind::ReLateBound(..) = *reg {
debug!(" hit an ReLateBound {:?}", reg);
if let Some(lt) = reg.clean(cx) {
late_bounds.push(GenericParamDef::Lifetime(lt));
}
}
}
}
}
}
TraitBound(
PolyTrait {
trait_: ResolvedPath {
path,
typarams: None,
did: trait_ref.def_id,
is_generic: false,
},
generic_params: late_bounds,
},
hir::TraitBoundModifier::None
)
}
}
impl<'tcx> Clean<TyParamBound> for ty::TraitRef<'tcx> {
fn clean(&self, cx: &DocContext) -> TyParamBound {
(self, vec![]).clean(cx)
}
}
impl<'tcx> Clean<Option<Vec<TyParamBound>>> for Substs<'tcx> {
fn clean(&self, cx: &DocContext) -> Option<Vec<TyParamBound>> {
let mut v = Vec::new();
v.extend(self.regions().filter_map(|r| r.clean(cx))
.map(RegionBound));
v.extend(self.types().map(|t| TraitBound(PolyTrait {
trait_: t.clean(cx),
generic_params: Vec::new(),
}, hir::TraitBoundModifier::None)));
if !v.is_empty() {Some(v)} else {None}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub struct Lifetime(String);
impl Lifetime {
pub fn get_ref<'a>(&'a self) -> &'a str {
let Lifetime(ref s) = *self;
let s: &'a str = s;
s
}
pub fn statik() -> Lifetime {
Lifetime("'static".to_string())
}
}
impl Clean<Lifetime> for hir::Lifetime {
fn clean(&self, cx: &DocContext) -> Lifetime {
if self.id != ast::DUMMY_NODE_ID {
let hir_id = cx.tcx.hir.node_to_hir_id(self.id);
let def = cx.tcx.named_region(hir_id);
match def {
Some(rl::Region::EarlyBound(_, node_id, _)) |
Some(rl::Region::LateBound(_, node_id, _)) |
Some(rl::Region::Free(_, node_id)) => {
if let Some(lt) = cx.lt_substs.borrow().get(&node_id).cloned() {
return lt;
}
}
_ => {}
}
}
Lifetime(self.name.name().to_string())
}
}
impl Clean<Lifetime> for hir::LifetimeDef {
fn clean(&self, _: &DocContext) -> Lifetime {
if self.bounds.len() > 0 {
let mut s = format!("{}: {}",
self.lifetime.name.name(),
self.bounds[0].name.name());
for bound in self.bounds.iter().skip(1) {
s.push_str(&format!(" + {}", bound.name.name()));
}
Lifetime(s)
} else {
Lifetime(self.lifetime.name.name().to_string())
}
}
}
impl<'tcx> Clean<Lifetime> for ty::GenericParamDef {
fn clean(&self, _cx: &DocContext) -> Lifetime {
Lifetime(self.name.to_string())
}
}
impl Clean<Option<Lifetime>> for ty::RegionKind {
fn clean(&self, cx: &DocContext) -> Option<Lifetime> {
match *self {
ty::ReStatic => Some(Lifetime::statik()),
ty::ReLateBound(_, ty::BrNamed(_, name)) => Some(Lifetime(name.to_string())),
ty::ReEarlyBound(ref data) => Some(Lifetime(data.name.clean(cx))),
ty::ReLateBound(..) |
ty::ReFree(..) |
ty::ReScope(..) |
ty::ReVar(..) |
ty::ReSkolemized(..) |
ty::ReEmpty |
ty::ReClosureBound(_) |
ty::ReCanonical(_) |
ty::ReErased => None
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub enum WherePredicate {
BoundPredicate { ty: Type, bounds: Vec<TyParamBound> },
RegionPredicate { lifetime: Lifetime, bounds: Vec<Lifetime>},
EqPredicate { lhs: Type, rhs: Type },
}
impl Clean<WherePredicate> for hir::WherePredicate {
fn clean(&self, cx: &DocContext) -> WherePredicate {
match *self {
hir::WherePredicate::BoundPredicate(ref wbp) => {
WherePredicate::BoundPredicate {
ty: wbp.bounded_ty.clean(cx),
bounds: wbp.bounds.clean(cx)
}
}
hir::WherePredicate::RegionPredicate(ref wrp) => {
WherePredicate::RegionPredicate {
lifetime: wrp.lifetime.clean(cx),
bounds: wrp.bounds.clean(cx)
}
}
hir::WherePredicate::EqPredicate(ref wrp) => {
WherePredicate::EqPredicate {
lhs: wrp.lhs_ty.clean(cx),
rhs: wrp.rhs_ty.clean(cx)
}
}
}
}
}
impl<'a> Clean<WherePredicate> for ty::Predicate<'a> {
fn clean(&self, cx: &DocContext) -> WherePredicate {
use rustc::ty::Predicate;
match *self {
Predicate::Trait(ref pred) => pred.clean(cx),
Predicate::Subtype(ref pred) => pred.clean(cx),
Predicate::RegionOutlives(ref pred) => pred.clean(cx),
Predicate::TypeOutlives(ref pred) => pred.clean(cx),
Predicate::Projection(ref pred) => pred.clean(cx),
Predicate::WellFormed(_) => panic!("not user writable"),
Predicate::ObjectSafe(_) => panic!("not user writable"),
Predicate::ClosureKind(..) => panic!("not user writable"),
Predicate::ConstEvaluatable(..) => panic!("not user writable"),
}
}
}
impl<'a> Clean<WherePredicate> for ty::TraitPredicate<'a> {
fn clean(&self, cx: &DocContext) -> WherePredicate {
WherePredicate::BoundPredicate {
ty: self.trait_ref.self_ty().clean(cx),
bounds: vec![self.trait_ref.clean(cx)]
}
}
}
impl<'tcx> Clean<WherePredicate> for ty::SubtypePredicate<'tcx> {
fn clean(&self, _cx: &DocContext) -> WherePredicate {
panic!("subtype predicates are an internal rustc artifact \
and should not be seen by rustdoc")
}
}
impl<'tcx> Clean<WherePredicate> for ty::OutlivesPredicate<ty::Region<'tcx>, ty::Region<'tcx>> {
fn clean(&self, cx: &DocContext) -> WherePredicate {
let ty::OutlivesPredicate(ref a, ref b) = *self;
WherePredicate::RegionPredicate {
lifetime: a.clean(cx).unwrap(),
bounds: vec![b.clean(cx).unwrap()]
}
}
}
impl<'tcx> Clean<WherePredicate> for ty::OutlivesPredicate<Ty<'tcx>, ty::Region<'tcx>> {
fn clean(&self, cx: &DocContext) -> WherePredicate {
let ty::OutlivesPredicate(ref ty, ref lt) = *self;
WherePredicate::BoundPredicate {
ty: ty.clean(cx),
bounds: vec![TyParamBound::RegionBound(lt.clean(cx).unwrap())]
}
}
}
impl<'tcx> Clean<WherePredicate> for ty::ProjectionPredicate<'tcx> {
fn clean(&self, cx: &DocContext) -> WherePredicate {
WherePredicate::EqPredicate {
lhs: self.projection_ty.clean(cx),
rhs: self.ty.clean(cx)
}
}
}
impl<'tcx> Clean<Type> for ty::ProjectionTy<'tcx> {
fn clean(&self, cx: &DocContext) -> Type {
let trait_ = match self.trait_ref(cx.tcx).clean(cx) {
TyParamBound::TraitBound(t, _) => t.trait_,
TyParamBound::RegionBound(_) => {
panic!("cleaning a trait got a region")
}
};
Type::QPath {
name: cx.tcx.associated_item(self.item_def_id).name.clean(cx),
self_type: box self.self_ty().clean(cx),
trait_: box trait_
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub enum GenericParamDef {
Lifetime(Lifetime),
Type(TyParam),
}
impl GenericParamDef {
pub fn is_synthetic_type_param(&self) -> bool {
match self {
GenericParamDef::Type(ty) => ty.synthetic.is_some(),
GenericParamDef::Lifetime(_) => false,
}
}
}
impl Clean<GenericParamDef> for hir::GenericParam {
fn clean(&self, cx: &DocContext) -> GenericParamDef {
match *self {
hir::GenericParam::Lifetime(ref l) => GenericParamDef::Lifetime(l.clean(cx)),
hir::GenericParam::Type(ref t) => GenericParamDef::Type(t.clean(cx)),
}
}
}
// maybe use a Generic enum and use Vec<Generic>?
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Default, Hash)]
pub struct Generics {
pub params: Vec<GenericParamDef>,
pub where_predicates: Vec<WherePredicate>,
}
impl Clean<Generics> for hir::Generics {
fn clean(&self, cx: &DocContext) -> Generics {
// Synthetic type-parameters are inserted after normal ones.
// In order for normal parameters to be able to refer to synthetic ones,
// scans them first.
fn is_impl_trait(param: &hir::GenericParam) -> bool {
if let hir::GenericParam::Type(ref tp) = param {
tp.synthetic == Some(hir::SyntheticTyParamKind::ImplTrait)
} else {
false
}
}
let impl_trait_params = self.params
.iter()
.filter(|p| is_impl_trait(p))
.map(|p| {
let p = p.clean(cx);
if let GenericParamDef::Type(ref tp) = p {
cx.impl_trait_bounds
.borrow_mut()
.insert(tp.did, tp.bounds.clone());
} else {
unreachable!()
}
p
})
.collect::<Vec<_>>();
let mut params = Vec::with_capacity(self.params.len());
for p in self.params.iter().filter(|p| !is_impl_trait(p)) {
let p = p.clean(cx);
params.push(p);
}
params.extend(impl_trait_params);
let mut g = Generics {
params,
where_predicates: self.where_clause.predicates.clean(cx)
};
// Some duplicates are generated for ?Sized bounds between type params and where
// predicates. The point in here is to move the bounds definitions from type params
// to where predicates when such cases occur.
for where_pred in &mut g.where_predicates {
match *where_pred {
WherePredicate::BoundPredicate { ty: Generic(ref name), ref mut bounds } => {
if bounds.is_empty() {
for param in &mut g.params {
if let GenericParamDef::Type(ref mut type_param) = *param {
if &type_param.name == name {
mem::swap(bounds, &mut type_param.bounds);
break
}
}
}
}
}
_ => continue,
}
}
g
}
}
impl<'a, 'tcx> Clean<Generics> for (&'a ty::Generics,
&'a ty::GenericPredicates<'tcx>) {
fn clean(&self, cx: &DocContext) -> Generics {
use self::WherePredicate as WP;
let (gens, preds) = *self;
// Bounds in the type_params and lifetimes fields are repeated in the
// predicates field (see rustc_typeck::collect::ty_generics), so remove
// them.
let stripped_typarams = gens.params.iter().filter_map(|param| {
if let ty::GenericParamDefKind::Type {..} = param.kind {
if param.name == keywords::SelfType.name().as_str() {
assert_eq!(param.index, 0);
None
} else {
Some(param.clean(cx))
}
} else {
None
}
}).collect::<Vec<TyParam>>();
let mut where_predicates = preds.predicates.to_vec().clean(cx);
// Type parameters and have a Sized bound by default unless removed with
// ?Sized. Scan through the predicates and mark any type parameter with
// a Sized bound, removing the bounds as we find them.
//
// Note that associated types also have a sized bound by default, but we
// don't actually know the set of associated types right here so that's
// handled in cleaning associated types
let mut sized_params = FxHashSet();
where_predicates.retain(|pred| {
match *pred {
WP::BoundPredicate { ty: Generic(ref g), ref bounds } => {
if bounds.iter().any(|b| b.is_sized_bound(cx)) {
sized_params.insert(g.clone());
false
} else {
true
}
}
_ => true,
}
});
// Run through the type parameters again and insert a ?Sized
// unbound for any we didn't find to be Sized.
for tp in &stripped_typarams {
if !sized_params.contains(&tp.name) {
where_predicates.push(WP::BoundPredicate {
ty: Type::Generic(tp.name.clone()),
bounds: vec![TyParamBound::maybe_sized(cx)],
})
}
}
// It would be nice to collect all of the bounds on a type and recombine
// them if possible, to avoid e.g. `where T: Foo, T: Bar, T: Sized, T: 'a`
// and instead see `where T: Foo + Bar + Sized + 'a`
Generics {
params: gens.params
.iter()
.flat_map(|param| {
if let ty::GenericParamDefKind::Lifetime = param.kind {
Some(GenericParamDef::Lifetime(param.clean(cx)))
} else {
None
}
}).chain(
simplify::ty_params(stripped_typarams)
.into_iter()
.map(|tp| GenericParamDef::Type(tp))
)
.collect(),
where_predicates: simplify::where_clauses(cx, where_predicates),
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Method {
pub generics: Generics,
pub unsafety: hir::Unsafety,
pub constness: hir::Constness,
pub decl: FnDecl,
pub abi: Abi,
}
impl<'a> Clean<Method> for (&'a hir::MethodSig, &'a hir::Generics, hir::BodyId) {
fn clean(&self, cx: &DocContext) -> Method {
let (generics, decl) = enter_impl_trait(cx, || {
(self.1.clean(cx), (&*self.0.decl, self.2).clean(cx))
});
Method {
decl,
generics,
unsafety: self.0.unsafety,
constness: self.0.constness,
abi: self.0.abi
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct TyMethod {
pub unsafety: hir::Unsafety,
pub decl: FnDecl,
pub generics: Generics,
pub abi: Abi,
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Function {
pub decl: FnDecl,
pub generics: Generics,
pub unsafety: hir::Unsafety,
pub constness: hir::Constness,
pub abi: Abi,
}
impl Clean<Item> for doctree::Function {
fn clean(&self, cx: &DocContext) -> Item {
let (generics, decl) = enter_impl_trait(cx, || {
(self.generics.clean(cx), (&self.decl, self.body).clean(cx))
});
Item {
name: Some(self.name.clean(cx)),
attrs: self.attrs.clean(cx),
source: self.whence.clean(cx),
visibility: self.vis.clean(cx),
stability: self.stab.clean(cx),
deprecation: self.depr.clean(cx),
def_id: cx.tcx.hir.local_def_id(self.id),
inner: FunctionItem(Function {
decl,
generics,
unsafety: self.unsafety,
constness: self.constness,
abi: self.abi,
}),
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub struct FnDecl {
pub inputs: Arguments,
pub output: FunctionRetTy,
pub variadic: bool,
pub attrs: Attributes,
}
impl FnDecl {
pub fn has_self(&self) -> bool {
self.inputs.values.len() > 0 && self.inputs.values[0].name == "self"
}
pub fn self_type(&self) -> Option<SelfTy> {
self.inputs.values.get(0).and_then(|v| v.to_self())
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub struct Arguments {
pub values: Vec<Argument>,
}
impl<'a> Clean<Arguments> for (&'a [P<hir::Ty>], &'a [Spanned<ast::Name>]) {
fn clean(&self, cx: &DocContext) -> Arguments {
Arguments {
values: self.0.iter().enumerate().map(|(i, ty)| {
let mut name = self.1.get(i).map(|n| n.node.to_string())
.unwrap_or(String::new());
if name.is_empty() {
name = "_".to_string();
}
Argument {
name,
type_: ty.clean(cx),
}
}).collect()
}
}
}
impl<'a> Clean<Arguments> for (&'a [P<hir::Ty>], hir::BodyId) {
fn clean(&self, cx: &DocContext) -> Arguments {
let body = cx.tcx.hir.body(self.1);
Arguments {
values: self.0.iter().enumerate().map(|(i, ty)| {
Argument {
name: name_from_pat(&body.arguments[i].pat),
type_: ty.clean(cx),
}
}).collect()
}
}
}
impl<'a, A: Copy> Clean<FnDecl> for (&'a hir::FnDecl, A)
where (&'a [P<hir::Ty>], A): Clean<Arguments>
{
fn clean(&self, cx: &DocContext) -> FnDecl {
FnDecl {
inputs: (&self.0.inputs[..], self.1).clean(cx),
output: self.0.output.clean(cx),
variadic: self.0.variadic,
attrs: Attributes::default()
}
}
}
impl<'a, 'tcx> Clean<FnDecl> for (DefId, ty::PolyFnSig<'tcx>) {
fn clean(&self, cx: &DocContext) -> FnDecl {
let (did, sig) = *self;
let mut names = if cx.tcx.hir.as_local_node_id(did).is_some() {
vec![].into_iter()
} else {
cx.tcx.fn_arg_names(did).into_iter()
};
FnDecl {
output: Return(sig.skip_binder().output().clean(cx)),
attrs: Attributes::default(),
variadic: sig.skip_binder().variadic,
inputs: Arguments {
values: sig.skip_binder().inputs().iter().map(|t| {
Argument {
type_: t.clean(cx),
name: names.next().map_or("".to_string(), |name| name.to_string()),
}
}).collect(),
},
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub struct Argument {
pub type_: Type,
pub name: String,
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Debug)]
pub enum SelfTy {
SelfValue,
SelfBorrowed(Option<Lifetime>, Mutability),
SelfExplicit(Type),
}
impl Argument {
pub fn to_self(&self) -> Option<SelfTy> {
if self.name != "self" {
return None;
}
if self.type_.is_self_type() {
return Some(SelfValue);
}
match self.type_ {
BorrowedRef{ref lifetime, mutability, ref type_} if type_.is_self_type() => {
Some(SelfBorrowed(lifetime.clone(), mutability))
}
_ => Some(SelfExplicit(self.type_.clone()))
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub enum FunctionRetTy {
Return(Type),
DefaultReturn,
}
impl Clean<FunctionRetTy> for hir::FunctionRetTy {
fn clean(&self, cx: &DocContext) -> FunctionRetTy {
match *self {
hir::Return(ref typ) => Return(typ.clean(cx)),
hir::DefaultReturn(..) => DefaultReturn,
}
}
}
impl GetDefId for FunctionRetTy {
fn def_id(&self) -> Option<DefId> {
match *self {
Return(ref ty) => ty.def_id(),
DefaultReturn => None,
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Trait {
pub auto: bool,
pub unsafety: hir::Unsafety,
pub items: Vec<Item>,
pub generics: Generics,
pub bounds: Vec<TyParamBound>,
pub is_spotlight: bool,
pub is_auto: bool,
}
impl Clean<Item> for doctree::Trait {
fn clean(&self, cx: &DocContext) -> Item {
let attrs = self.attrs.clean(cx);
let is_spotlight = attrs.has_doc_flag("spotlight");
Item {
name: Some(self.name.clean(cx)),
attrs: attrs,
source: self.whence.clean(cx),
def_id: cx.tcx.hir.local_def_id(self.id),
visibility: self.vis.clean(cx),
stability: self.stab.clean(cx),
deprecation: self.depr.clean(cx),
inner: TraitItem(Trait {
auto: self.is_auto.clean(cx),
unsafety: self.unsafety,
items: self.items.clean(cx),
generics: self.generics.clean(cx),
bounds: self.bounds.clean(cx),
is_spotlight: is_spotlight,
is_auto: self.is_auto.clean(cx),
}),
}
}
}
impl Clean<bool> for hir::IsAuto {
fn clean(&self, _: &DocContext) -> bool {
match *self {
hir::IsAuto::Yes => true,
hir::IsAuto::No => false,
}
}
}
impl Clean<Type> for hir::TraitRef {
fn clean(&self, cx: &DocContext) -> Type {
resolve_type(cx, self.path.clean(cx), self.ref_id)
}
}
impl Clean<PolyTrait> for hir::PolyTraitRef {
fn clean(&self, cx: &DocContext) -> PolyTrait {
PolyTrait {
trait_: self.trait_ref.clean(cx),
generic_params: self.bound_generic_params.clean(cx)
}
}
}
impl Clean<Item> for hir::TraitItem {
fn clean(&self, cx: &DocContext) -> Item {
let inner = match self.node {
hir::TraitItemKind::Const(ref ty, default) => {
AssociatedConstItem(ty.clean(cx),
default.map(|e| print_const_expr(cx, e)))
}
hir::TraitItemKind::Method(ref sig, hir::TraitMethod::Provided(body)) => {
MethodItem((sig, &self.generics, body).clean(cx))
}
hir::TraitItemKind::Method(ref sig, hir::TraitMethod::Required(ref names)) => {
let (generics, decl) = enter_impl_trait(cx, || {
(self.generics.clean(cx), (&*sig.decl, &names[..]).clean(cx))
});
TyMethodItem(TyMethod {
unsafety: sig.unsafety.clone(),
decl,
generics,
abi: sig.abi
})
}
hir::TraitItemKind::Type(ref bounds, ref default) => {
AssociatedTypeItem(bounds.clean(cx), default.clean(cx))
}
};
Item {
name: Some(self.name.clean(cx)),
attrs: self.attrs.clean(cx),
source: self.span.clean(cx),
def_id: cx.tcx.hir.local_def_id(self.id),
visibility: None,
stability: get_stability(cx, cx.tcx.hir.local_def_id(self.id)),
deprecation: get_deprecation(cx, cx.tcx.hir.local_def_id(self.id)),
inner,
}
}
}
impl Clean<Item> for hir::ImplItem {
fn clean(&self, cx: &DocContext) -> Item {
let inner = match self.node {
hir::ImplItemKind::Const(ref ty, expr) => {
AssociatedConstItem(ty.clean(cx),
Some(print_const_expr(cx, expr)))
}
hir::ImplItemKind::Method(ref sig, body) => {
MethodItem((sig, &self.generics, body).clean(cx))
}
hir::ImplItemKind::Type(ref ty) => TypedefItem(Typedef {
type_: ty.clean(cx),
generics: Generics::default(),
}, true),
};
Item {
name: Some(self.name.clean(cx)),
source: self.span.clean(cx),
attrs: self.attrs.clean(cx),
def_id: cx.tcx.hir.local_def_id(self.id),
visibility: self.vis.clean(cx),
stability: get_stability(cx, cx.tcx.hir.local_def_id(self.id)),
deprecation: get_deprecation(cx, cx.tcx.hir.local_def_id(self.id)),
inner,
}
}
}
impl<'tcx> Clean<Item> for ty::AssociatedItem {
fn clean(&self, cx: &DocContext) -> Item {
let inner = match self.kind {
ty::AssociatedKind::Const => {
let ty = cx.tcx.type_of(self.def_id);
let default = if self.defaultness.has_value() {
Some(inline::print_inlined_const(cx, self.def_id))
} else {
None
};
AssociatedConstItem(ty.clean(cx), default)
}
ty::AssociatedKind::Method => {
let generics = (cx.tcx.generics_of(self.def_id),
&cx.tcx.predicates_of(self.def_id)).clean(cx);
let sig = cx.tcx.fn_sig(self.def_id);
let mut decl = (self.def_id, sig).clean(cx);
if self.method_has_self_argument {
let self_ty = match self.container {
ty::ImplContainer(def_id) => {
cx.tcx.type_of(def_id)
}
ty::TraitContainer(_) => cx.tcx.mk_self_type()
};
let self_arg_ty = *sig.input(0).skip_binder();
if self_arg_ty == self_ty {
decl.inputs.values[0].type_ = Generic(String::from("Self"));
} else if let ty::TyRef(_, ty, _) = self_arg_ty.sty {
if ty == self_ty {
match decl.inputs.values[0].type_ {
BorrowedRef{ref mut type_, ..} => {
**type_ = Generic(String::from("Self"))
}
_ => unreachable!(),
}
}
}
}
let provided = match self.container {
ty::ImplContainer(_) => true,
ty::TraitContainer(_) => self.defaultness.has_value()
};
if provided {
let constness = if cx.tcx.is_const_fn(self.def_id) {
hir::Constness::Const
} else {
hir::Constness::NotConst
};
MethodItem(Method {
unsafety: sig.unsafety(),
generics,
decl,
abi: sig.abi(),
constness,
})
} else {
TyMethodItem(TyMethod {
unsafety: sig.unsafety(),
generics,
decl,
abi: sig.abi(),
})
}
}
ty::AssociatedKind::Type => {
let my_name = self.name.clean(cx);
if let ty::TraitContainer(did) = self.container {
// When loading a cross-crate associated type, the bounds for this type
// are actually located on the trait/impl itself, so we need to load
// all of the generics from there and then look for bounds that are
// applied to this associated type in question.
let predicates = cx.tcx.predicates_of(did);
let generics = (cx.tcx.generics_of(did), &predicates).clean(cx);
let mut bounds = generics.where_predicates.iter().filter_map(|pred| {
let (name, self_type, trait_, bounds) = match *pred {
WherePredicate::BoundPredicate {
ty: QPath { ref name, ref self_type, ref trait_ },
ref bounds
} => (name, self_type, trait_, bounds),
_ => return None,
};
if *name != my_name { return None }
match **trait_ {
ResolvedPath { did, .. } if did == self.container.id() => {}
_ => return None,
}
match **self_type {
Generic(ref s) if *s == "Self" => {}
_ => return None,
}
Some(bounds)
}).flat_map(|i| i.iter().cloned()).collect::<Vec<_>>();
// Our Sized/?Sized bound didn't get handled when creating the generics
// because we didn't actually get our whole set of bounds until just now
// (some of them may have come from the trait). If we do have a sized
// bound, we remove it, and if we don't then we add the `?Sized` bound
// at the end.
match bounds.iter().position(|b| b.is_sized_bound(cx)) {
Some(i) => { bounds.remove(i); }
None => bounds.push(TyParamBound::maybe_sized(cx)),
}
let ty = if self.defaultness.has_value() {
Some(cx.tcx.type_of(self.def_id))
} else {
None
};
AssociatedTypeItem(bounds, ty.clean(cx))
} else {
TypedefItem(Typedef {
type_: cx.tcx.type_of(self.def_id).clean(cx),
generics: Generics {
params: Vec::new(),
where_predicates: Vec::new(),
},
}, true)
}
}
};
let visibility = match self.container {
ty::ImplContainer(_) => self.vis.clean(cx),
ty::TraitContainer(_) => None,
};
Item {
name: Some(self.name.clean(cx)),
visibility,
stability: get_stability(cx, self.def_id),
deprecation: get_deprecation(cx, self.def_id),
def_id: self.def_id,
attrs: inline::load_attrs(cx, self.def_id),
source: cx.tcx.def_span(self.def_id).clean(cx),
inner,
}
}
}
/// A trait reference, which may have higher ranked lifetimes.
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub struct PolyTrait {
pub trait_: Type,
pub generic_params: Vec<GenericParamDef>,
}
/// A representation of a Type suitable for hyperlinking purposes. Ideally one can get the original
/// type out of the AST/TyCtxt given one of these, if more information is needed. Most importantly
/// it does not preserve mutability or boxes.
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub enum Type {
/// structs/enums/traits (most that'd be an hir::TyPath)
ResolvedPath {
path: Path,
typarams: Option<Vec<TyParamBound>>,
did: DefId,
/// true if is a `T::Name` path for associated types
is_generic: bool,
},
/// For parameterized types, so the consumer of the JSON don't go
/// looking for types which don't exist anywhere.
Generic(String),
/// Primitives are the fixed-size numeric types (plus int/usize/float), char,
/// arrays, slices, and tuples.
Primitive(PrimitiveType),
/// extern "ABI" fn
BareFunction(Box<BareFunctionDecl>),
Tuple(Vec<Type>),
Slice(Box<Type>),
Array(Box<Type>, String),
Never,
Unique(Box<Type>),
RawPointer(Mutability, Box<Type>),
BorrowedRef {
lifetime: Option<Lifetime>,
mutability: Mutability,
type_: Box<Type>,
},
// <Type as Trait>::Name
QPath {
name: String,
self_type: Box<Type>,
trait_: Box<Type>
},
// _
Infer,
// impl TraitA+TraitB
ImplTrait(Vec<TyParamBound>),
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Copy, Debug)]
pub enum PrimitiveType {
Isize, I8, I16, I32, I64, I128,
Usize, U8, U16, U32, U64, U128,
F32, F64,
Char,
Bool,
Str,
Slice,
Array,
Tuple,
Unit,
RawPointer,
Reference,
Fn,
Never,
}
#[derive(Clone, RustcEncodable, RustcDecodable, Copy, Debug)]
pub enum TypeKind {
Enum,
Function,
Module,
Const,
Static,
Struct,
Union,
Trait,
Variant,
Typedef,
Foreign,
Macro,
}
pub trait GetDefId {
fn def_id(&self) -> Option<DefId>;
}
impl<T: GetDefId> GetDefId for Option<T> {
fn def_id(&self) -> Option<DefId> {
self.as_ref().and_then(|d| d.def_id())
}
}
impl Type {
pub fn primitive_type(&self) -> Option<PrimitiveType> {
match *self {
Primitive(p) | BorrowedRef { type_: box Primitive(p), ..} => Some(p),
Slice(..) | BorrowedRef { type_: box Slice(..), .. } => Some(PrimitiveType::Slice),
Array(..) | BorrowedRef { type_: box Array(..), .. } => Some(PrimitiveType::Array),
Tuple(ref tys) => if tys.is_empty() {
Some(PrimitiveType::Unit)
} else {
Some(PrimitiveType::Tuple)
},
RawPointer(..) => Some(PrimitiveType::RawPointer),
BorrowedRef { type_: box Generic(..), .. } => Some(PrimitiveType::Reference),
BareFunction(..) => Some(PrimitiveType::Fn),
Never => Some(PrimitiveType::Never),
_ => None,
}
}
pub fn is_generic(&self) -> bool {
match *self {
ResolvedPath { is_generic, .. } => is_generic,
_ => false,
}
}
pub fn is_self_type(&self) -> bool {
match *self {
Generic(ref name) => name == "Self",
_ => false
}
}
pub fn generics(&self) -> Option<&[Type]> {
match *self {
ResolvedPath { ref path, .. } => {
path.segments.last().and_then(|seg| {
if let PathParameters::AngleBracketed { ref types, .. } = seg.params {
Some(&**types)
} else {
None
}
})
}
_ => None,
}
}
}
impl GetDefId for Type {
fn def_id(&self) -> Option<DefId> {
match *self {
ResolvedPath { did, .. } => Some(did),
Primitive(p) => ::html::render::cache().primitive_locations.get(&p).cloned(),
BorrowedRef { type_: box Generic(..), .. } =>
Primitive(PrimitiveType::Reference).def_id(),
BorrowedRef { ref type_, .. } => type_.def_id(),
Tuple(ref tys) => if tys.is_empty() {
Primitive(PrimitiveType::Unit).def_id()
} else {
Primitive(PrimitiveType::Tuple).def_id()
},
BareFunction(..) => Primitive(PrimitiveType::Fn).def_id(),
Never => Primitive(PrimitiveType::Never).def_id(),
Slice(..) => Primitive(PrimitiveType::Slice).def_id(),
Array(..) => Primitive(PrimitiveType::Array).def_id(),
RawPointer(..) => Primitive(PrimitiveType::RawPointer).def_id(),
QPath { ref self_type, .. } => self_type.def_id(),
_ => None,
}
}
}
impl PrimitiveType {
fn from_str(s: &str) -> Option<PrimitiveType> {
match s {
"isize" => Some(PrimitiveType::Isize),
"i8" => Some(PrimitiveType::I8),
"i16" => Some(PrimitiveType::I16),
"i32" => Some(PrimitiveType::I32),
"i64" => Some(PrimitiveType::I64),
"i128" => Some(PrimitiveType::I128),
"usize" => Some(PrimitiveType::Usize),
"u8" => Some(PrimitiveType::U8),
"u16" => Some(PrimitiveType::U16),
"u32" => Some(PrimitiveType::U32),
"u64" => Some(PrimitiveType::U64),
"u128" => Some(PrimitiveType::U128),
"bool" => Some(PrimitiveType::Bool),
"char" => Some(PrimitiveType::Char),
"str" => Some(PrimitiveType::Str),
"f32" => Some(PrimitiveType::F32),
"f64" => Some(PrimitiveType::F64),
"array" => Some(PrimitiveType::Array),
"slice" => Some(PrimitiveType::Slice),
"tuple" => Some(PrimitiveType::Tuple),
"unit" => Some(PrimitiveType::Unit),
"pointer" => Some(PrimitiveType::RawPointer),
"reference" => Some(PrimitiveType::Reference),
"fn" => Some(PrimitiveType::Fn),
"never" => Some(PrimitiveType::Never),
_ => None,
}
}
pub fn as_str(&self) -> &'static str {
use self::PrimitiveType::*;
match *self {
Isize => "isize",
I8 => "i8",
I16 => "i16",
I32 => "i32",
I64 => "i64",
I128 => "i128",
Usize => "usize",
U8 => "u8",
U16 => "u16",
U32 => "u32",
U64 => "u64",
U128 => "u128",
F32 => "f32",
F64 => "f64",
Str => "str",
Bool => "bool",
Char => "char",
Array => "array",
Slice => "slice",
Tuple => "tuple",
Unit => "unit",
RawPointer => "pointer",
Reference => "reference",
Fn => "fn",
Never => "never",
}
}
pub fn to_url_str(&self) -> &'static str {
self.as_str()
}
}
impl From<ast::IntTy> for PrimitiveType {
fn from(int_ty: ast::IntTy) -> PrimitiveType {
match int_ty {
ast::IntTy::Isize => PrimitiveType::Isize,
ast::IntTy::I8 => PrimitiveType::I8,
ast::IntTy::I16 => PrimitiveType::I16,
ast::IntTy::I32 => PrimitiveType::I32,
ast::IntTy::I64 => PrimitiveType::I64,
ast::IntTy::I128 => PrimitiveType::I128,
}
}
}
impl From<ast::UintTy> for PrimitiveType {
fn from(uint_ty: ast::UintTy) -> PrimitiveType {
match uint_ty {
ast::UintTy::Usize => PrimitiveType::Usize,
ast::UintTy::U8 => PrimitiveType::U8,
ast::UintTy::U16 => PrimitiveType::U16,
ast::UintTy::U32 => PrimitiveType::U32,
ast::UintTy::U64 => PrimitiveType::U64,
ast::UintTy::U128 => PrimitiveType::U128,
}
}
}
impl From<ast::FloatTy> for PrimitiveType {
fn from(float_ty: ast::FloatTy) -> PrimitiveType {
match float_ty {
ast::FloatTy::F32 => PrimitiveType::F32,
ast::FloatTy::F64 => PrimitiveType::F64,
}
}
}
impl Clean<Type> for hir::Ty {
fn clean(&self, cx: &DocContext) -> Type {
use rustc::hir::*;
match self.node {
TyNever => Never,
TyPtr(ref m) => RawPointer(m.mutbl.clean(cx), box m.ty.clean(cx)),
TyRptr(ref l, ref m) => {
let lifetime = if l.is_elided() {
None
} else {
Some(l.clean(cx))
};
BorrowedRef {lifetime: lifetime, mutability: m.mutbl.clean(cx),
type_: box m.ty.clean(cx)}
}
TySlice(ref ty) => Slice(box ty.clean(cx)),
TyArray(ref ty, ref length) => {
let def_id = cx.tcx.hir.local_def_id(length.id);
let param_env = cx.tcx.param_env(def_id);
let substs = Substs::identity_for_item(cx.tcx, def_id);
let cid = GlobalId {
instance: ty::Instance::new(def_id, substs),
promoted: None
};
let length = cx.tcx.const_eval(param_env.and(cid)).unwrap_or_else(|_| {
ty::Const::unevaluated(cx.tcx, def_id, substs, cx.tcx.types.usize)
});
let length = print_const(cx, length);
Array(box ty.clean(cx), length)
},
TyTup(ref tys) => Tuple(tys.clean(cx)),
TyPath(hir::QPath::Resolved(None, ref path)) => {
if let Some(new_ty) = cx.ty_substs.borrow().get(&path.def).cloned() {
return new_ty;
}
if let Def::TyParam(did) = path.def {
if let Some(bounds) = cx.impl_trait_bounds.borrow_mut().remove(&did) {
return ImplTrait(bounds);
}
}
let mut alias = None;
if let Def::TyAlias(def_id) = path.def {
// Substitute private type aliases
if let Some(node_id) = cx.tcx.hir.as_local_node_id(def_id) {
if !cx.access_levels.borrow().is_exported(def_id) {
alias = Some(&cx.tcx.hir.expect_item(node_id).node);
}
}
};
if let Some(&hir::ItemTy(ref ty, ref generics)) = alias {
let provided_params = &path.segments.last().unwrap();
let mut ty_substs = FxHashMap();
let mut lt_substs = FxHashMap();
provided_params.with_parameters(|provided_params| {
let mut indices = GenericParamCount {
lifetimes: 0,
types: 0
};
for param in generics.params.iter() {
match param {
hir::GenericParam::Lifetime(lt_param) => {
if let Some(lt) = provided_params.lifetimes
.get(indices.lifetimes).cloned() {
if !lt.is_elided() {
let lt_def_id =
cx.tcx.hir.local_def_id(lt_param.lifetime.id);
lt_substs.insert(lt_def_id, lt.clean(cx));
}
}
indices.lifetimes += 1;
}
hir::GenericParam::Type(ty_param) => {
let ty_param_def =
Def::TyParam(cx.tcx.hir.local_def_id(ty_param.id));
if let Some(ty) = provided_params.types
.get(indices.types).cloned() {
ty_substs.insert(ty_param_def, ty.into_inner().clean(cx));
} else if let Some(default) = ty_param.default.clone() {
ty_substs.insert(ty_param_def,
default.into_inner().clean(cx));
}
indices.types += 1;
}
}
}
});
return cx.enter_alias(ty_substs, lt_substs, || ty.clean(cx));
}
resolve_type(cx, path.clean(cx), self.id)
}
TyPath(hir::QPath::Resolved(Some(ref qself), ref p)) => {
let mut segments: Vec<_> = p.segments.clone().into();
segments.pop();
let trait_path = hir::Path {
span: p.span,
def: Def::Trait(cx.tcx.associated_item(p.def.def_id()).container.id()),
segments: segments.into(),
};
Type::QPath {
name: p.segments.last().unwrap().name.clean(cx),
self_type: box qself.clean(cx),
trait_: box resolve_type(cx, trait_path.clean(cx), self.id)
}
}
TyPath(hir::QPath::TypeRelative(ref qself, ref segment)) => {
let mut def = Def::Err;
let ty = hir_ty_to_ty(cx.tcx, self);
if let ty::TyProjection(proj) = ty.sty {
def = Def::Trait(proj.trait_ref(cx.tcx).def_id);
}
let trait_path = hir::Path {
span: self.span,
def,
segments: vec![].into(),
};
Type::QPath {
name: segment.name.clean(cx),
self_type: box qself.clean(cx),
trait_: box resolve_type(cx, trait_path.clean(cx), self.id)
}
}
TyTraitObject(ref bounds, ref lifetime) => {
match bounds[0].clean(cx).trait_ {
ResolvedPath { path, typarams: None, did, is_generic } => {
let mut bounds: Vec<_> = bounds[1..].iter().map(|bound| {
TraitBound(bound.clean(cx), hir::TraitBoundModifier::None)
}).collect();
if !lifetime.is_elided() {
bounds.push(RegionBound(lifetime.clean(cx)));
}
ResolvedPath {
path,
typarams: Some(bounds),
did,
is_generic,
}
}
_ => Infer // shouldn't happen
}
}
TyBareFn(ref barefn) => BareFunction(box barefn.clean(cx)),
TyImplTraitExistential(ref exist_ty, ref _lts) => ImplTrait(exist_ty.bounds.clean(cx)),
TyInfer | TyErr => Infer,
TyTypeof(..) => panic!("Unimplemented type {:?}", self.node),
}
}
}
impl<'tcx> Clean<Type> for Ty<'tcx> {
fn clean(&self, cx: &DocContext) -> Type {
match self.sty {
ty::TyNever => Never,
ty::TyBool => Primitive(PrimitiveType::Bool),
ty::TyChar => Primitive(PrimitiveType::Char),
ty::TyInt(int_ty) => Primitive(int_ty.into()),
ty::TyUint(uint_ty) => Primitive(uint_ty.into()),
ty::TyFloat(float_ty) => Primitive(float_ty.into()),
ty::TyStr => Primitive(PrimitiveType::Str),
ty::TySlice(ty) => Slice(box ty.clean(cx)),
ty::TyArray(ty, n) => {
let mut n = cx.tcx.lift(&n).unwrap();
if let ConstVal::Unevaluated(def_id, substs) = n.val {
let param_env = cx.tcx.param_env(def_id);
let cid = GlobalId {
instance: ty::Instance::new(def_id, substs),
promoted: None
};
if let Ok(new_n) = cx.tcx.const_eval(param_env.and(cid)) {
n = new_n;
}
};
let n = print_const(cx, n);
Array(box ty.clean(cx), n)
}
ty::TyRawPtr(mt) => RawPointer(mt.mutbl.clean(cx), box mt.ty.clean(cx)),
ty::TyRef(r, ty, mutbl) => BorrowedRef {
lifetime: r.clean(cx),
mutability: mutbl.clean(cx),
type_: box ty.clean(cx),
},
ty::TyFnDef(..) |
ty::TyFnPtr(_) => {
let ty = cx.tcx.lift(self).unwrap();
let sig = ty.fn_sig(cx.tcx);
BareFunction(box BareFunctionDecl {
unsafety: sig.unsafety(),
generic_params: Vec::new(),
decl: (cx.tcx.hir.local_def_id(ast::CRATE_NODE_ID), sig).clean(cx),
abi: sig.abi(),
})
}
ty::TyAdt(def, substs) => {
let did = def.did;
let kind = match def.adt_kind() {
AdtKind::Struct => TypeKind::Struct,
AdtKind::Union => TypeKind::Union,
AdtKind::Enum => TypeKind::Enum,
};
inline::record_extern_fqn(cx, did, kind);
let path = external_path(cx, &cx.tcx.item_name(did).as_str(),
None, false, vec![], substs);
ResolvedPath {
path,
typarams: None,
did,
is_generic: false,
}
}
ty::TyForeign(did) => {
inline::record_extern_fqn(cx, did, TypeKind::Foreign);
let path = external_path(cx, &cx.tcx.item_name(did).as_str(),
None, false, vec![], Substs::empty());
ResolvedPath {
path: path,
typarams: None,
did: did,
is_generic: false,
}
}
ty::TyDynamic(ref obj, ref reg) => {
if let Some(principal) = obj.principal() {
let did = principal.def_id();
inline::record_extern_fqn(cx, did, TypeKind::Trait);
let mut typarams = vec![];
reg.clean(cx).map(|b| typarams.push(RegionBound(b)));
for did in obj.auto_traits() {
let empty = cx.tcx.intern_substs(&[]);
let path = external_path(cx, &cx.tcx.item_name(did).as_str(),
Some(did), false, vec![], empty);
inline::record_extern_fqn(cx, did, TypeKind::Trait);
let bound = TraitBound(PolyTrait {
trait_: ResolvedPath {
path,
typarams: None,
did,
is_generic: false,
},
generic_params: Vec::new(),
}, hir::TraitBoundModifier::None);
typarams.push(bound);
}
let mut bindings = vec![];
for pb in obj.projection_bounds() {
bindings.push(TypeBinding {
name: cx.tcx.associated_item(pb.item_def_id()).name.clean(cx),
ty: pb.skip_binder().ty.clean(cx)
});
}
let path = external_path(cx, &cx.tcx.item_name(did).as_str(), Some(did),
false, bindings, principal.skip_binder().substs);
ResolvedPath {
path,
typarams: Some(typarams),
did,
is_generic: false,
}
} else {
Never
}
}
ty::TyTuple(ref t) => Tuple(t.clean(cx)),
ty::TyProjection(ref data) => data.clean(cx),
ty::TyParam(ref p) => Generic(p.name.to_string()),
ty::TyAnon(def_id, substs) => {
// Grab the "TraitA + TraitB" from `impl TraitA + TraitB`,
// by looking up the projections associated with the def_id.
let predicates_of = cx.tcx.predicates_of(def_id);
let substs = cx.tcx.lift(&substs).unwrap();
let bounds = predicates_of.instantiate(cx.tcx, substs);
let mut regions = vec![];
let mut has_sized = false;
let mut bounds = bounds.predicates.iter().filter_map(|predicate| {
let trait_ref = if let Some(tr) = predicate.to_opt_poly_trait_ref() {
tr
} else if let ty::Predicate::TypeOutlives(pred) = *predicate {
// these should turn up at the end
pred.skip_binder().1.clean(cx).map(|r| regions.push(RegionBound(r)));
return None;
} else {
return None;
};
if let Some(sized) = cx.tcx.lang_items().sized_trait() {
if trait_ref.def_id() == sized {
has_sized = true;
return None;
}
}
let bounds = bounds.predicates.iter().filter_map(|pred|
if let ty::Predicate::Projection(proj) = *pred {
let proj = proj.skip_binder();
if proj.projection_ty.trait_ref(cx.tcx) == *trait_ref.skip_binder() {
Some(TypeBinding {
name: cx.tcx.associated_item(proj.projection_ty.item_def_id)
.name.clean(cx),
ty: proj.ty.clean(cx),
})
} else {
None
}
} else {
None
}
).collect();
Some((trait_ref.skip_binder(), bounds).clean(cx))
}).collect::<Vec<_>>();
bounds.extend(regions);
if !has_sized && !bounds.is_empty() {
bounds.insert(0, TyParamBound::maybe_sized(cx));
}
ImplTrait(bounds)
}
ty::TyClosure(..) | ty::TyGenerator(..) => Tuple(vec![]), // FIXME(pcwalton)
ty::TyGeneratorWitness(..) => panic!("TyGeneratorWitness"),
ty::TyInfer(..) => panic!("TyInfer"),
ty::TyError => panic!("TyError"),
}
}
}
impl Clean<Item> for hir::StructField {
fn clean(&self, cx: &DocContext) -> Item {
Item {
name: Some(self.ident.name).clean(cx),
attrs: self.attrs.clean(cx),
source: self.span.clean(cx),
visibility: self.vis.clean(cx),
stability: get_stability(cx, cx.tcx.hir.local_def_id(self.id)),
deprecation: get_deprecation(cx, cx.tcx.hir.local_def_id(self.id)),
def_id: cx.tcx.hir.local_def_id(self.id),
inner: StructFieldItem(self.ty.clean(cx)),
}
}
}
impl<'tcx> Clean<Item> for ty::FieldDef {
fn clean(&self, cx: &DocContext) -> Item {
Item {
name: Some(self.ident.name).clean(cx),
attrs: cx.tcx.get_attrs(self.did).clean(cx),
source: cx.tcx.def_span(self.did).clean(cx),
visibility: self.vis.clean(cx),
stability: get_stability(cx, self.did),
deprecation: get_deprecation(cx, self.did),
def_id: self.did,
inner: StructFieldItem(cx.tcx.type_of(self.did).clean(cx)),
}
}
}
#[derive(Clone, PartialEq, Eq, RustcDecodable, RustcEncodable, Debug)]
pub enum Visibility {
Public,
Inherited,
Crate,
Restricted(DefId, Path),
}
impl Clean<Option<Visibility>> for hir::Visibility {
fn clean(&self, cx: &DocContext) -> Option<Visibility> {
Some(match *self {
hir::Visibility::Public => Visibility::Public,
hir::Visibility::Inherited => Visibility::Inherited,
hir::Visibility::Crate(_) => Visibility::Crate,
hir::Visibility::Restricted { ref path, .. } => {
let path = path.clean(cx);
let did = register_def(cx, path.def);
Visibility::Restricted(did, path)
}
})
}
}
impl Clean<Option<Visibility>> for ty::Visibility {
fn clean(&self, _: &DocContext) -> Option<Visibility> {
Some(if *self == ty::Visibility::Public { Public } else { Inherited })
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Struct {
pub struct_type: doctree::StructType,
pub generics: Generics,
pub fields: Vec<Item>,
pub fields_stripped: bool,
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Union {
pub struct_type: doctree::StructType,
pub generics: Generics,
pub fields: Vec<Item>,
pub fields_stripped: bool,
}
impl Clean<Vec<Item>> for doctree::Struct {
fn clean(&self, cx: &DocContext) -> Vec<Item> {
let name = self.name.clean(cx);
let mut ret = get_auto_traits_with_node_id(cx, self.id, name.clone());
ret.push(Item {
name: Some(name),
attrs: self.attrs.clean(cx),
source: self.whence.clean(cx),
def_id: cx.tcx.hir.local_def_id(self.id),
visibility: self.vis.clean(cx),
stability: self.stab.clean(cx),
deprecation: self.depr.clean(cx),
inner: StructItem(Struct {
struct_type: self.struct_type,
generics: self.generics.clean(cx),
fields: self.fields.clean(cx),
fields_stripped: false,
}),
});
ret
}
}
impl Clean<Vec<Item>> for doctree::Union {
fn clean(&self, cx: &DocContext) -> Vec<Item> {
let name = self.name.clean(cx);
let mut ret = get_auto_traits_with_node_id(cx, self.id, name.clone());
ret.push(Item {
name: Some(name),
attrs: self.attrs.clean(cx),
source: self.whence.clean(cx),
def_id: cx.tcx.hir.local_def_id(self.id),
visibility: self.vis.clean(cx),
stability: self.stab.clean(cx),
deprecation: self.depr.clean(cx),
inner: UnionItem(Union {
struct_type: self.struct_type,
generics: self.generics.clean(cx),
fields: self.fields.clean(cx),
fields_stripped: false,
}),
});
ret
}
}
/// This is a more limited form of the standard Struct, different in that
/// it lacks the things most items have (name, id, parameterization). Found
/// only as a variant in an enum.
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct VariantStruct {
pub struct_type: doctree::StructType,
pub fields: Vec<Item>,
pub fields_stripped: bool,
}
impl Clean<VariantStruct> for ::rustc::hir::VariantData {
fn clean(&self, cx: &DocContext) -> VariantStruct {
VariantStruct {
struct_type: doctree::struct_type_from_def(self),
fields: self.fields().iter().map(|x| x.clean(cx)).collect(),
fields_stripped: false,
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Enum {
pub variants: Vec<Item>,
pub generics: Generics,
pub variants_stripped: bool,
}
impl Clean<Vec<Item>> for doctree::Enum {
fn clean(&self, cx: &DocContext) -> Vec<Item> {
let name = self.name.clean(cx);
let mut ret = get_auto_traits_with_node_id(cx, self.id, name.clone());
ret.push(Item {
name: Some(name),
attrs: self.attrs.clean(cx),
source: self.whence.clean(cx),
def_id: cx.tcx.hir.local_def_id(self.id),
visibility: self.vis.clean(cx),
stability: self.stab.clean(cx),
deprecation: self.depr.clean(cx),
inner: EnumItem(Enum {
variants: self.variants.clean(cx),
generics: self.generics.clean(cx),
variants_stripped: false,
}),
});
ret
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Variant {
pub kind: VariantKind,
}
impl Clean<Item> for doctree::Variant {
fn clean(&self, cx: &DocContext) -> Item {
Item {
name: Some(self.name.clean(cx)),
attrs: self.attrs.clean(cx),
source: self.whence.clean(cx),
visibility: None,
stability: self.stab.clean(cx),
deprecation: self.depr.clean(cx),
def_id: cx.tcx.hir.local_def_id(self.def.id()),
inner: VariantItem(Variant {
kind: self.def.clean(cx),
}),
}
}
}
impl<'tcx> Clean<Item> for ty::VariantDef {
fn clean(&self, cx: &DocContext) -> Item {
let kind = match self.ctor_kind {
CtorKind::Const => VariantKind::CLike,
CtorKind::Fn => {
VariantKind::Tuple(
self.fields.iter().map(|f| cx.tcx.type_of(f.did).clean(cx)).collect()
)
}
CtorKind::Fictive => {
VariantKind::Struct(VariantStruct {
struct_type: doctree::Plain,
fields_stripped: false,
fields: self.fields.iter().map(|field| {
Item {
source: cx.tcx.def_span(field.did).clean(cx),
name: Some(field.ident.name.clean(cx)),
attrs: cx.tcx.get_attrs(field.did).clean(cx),
visibility: field.vis.clean(cx),
def_id: field.did,
stability: get_stability(cx, field.did),
deprecation: get_deprecation(cx, field.did),
inner: StructFieldItem(cx.tcx.type_of(field.did).clean(cx))
}
}).collect()
})
}
};
Item {
name: Some(self.name.clean(cx)),
attrs: inline::load_attrs(cx, self.did),
source: cx.tcx.def_span(self.did).clean(cx),
visibility: Some(Inherited),
def_id: self.did,
inner: VariantItem(Variant { kind: kind }),
stability: get_stability(cx, self.did),
deprecation: get_deprecation(cx, self.did),
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub enum VariantKind {
CLike,
Tuple(Vec<Type>),
Struct(VariantStruct),
}
impl Clean<VariantKind> for hir::VariantData {
fn clean(&self, cx: &DocContext) -> VariantKind {
if self.is_struct() {
VariantKind::Struct(self.clean(cx))
} else if self.is_unit() {
VariantKind::CLike
} else {
VariantKind::Tuple(self.fields().iter().map(|x| x.ty.clean(cx)).collect())
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Span {
pub filename: FileName,
pub loline: usize,
pub locol: usize,
pub hiline: usize,
pub hicol: usize,
}
impl Span {
pub fn empty() -> Span {
Span {
filename: FileName::Anon,
loline: 0, locol: 0,
hiline: 0, hicol: 0,
}
}
}
impl Clean<Span> for syntax_pos::Span {
fn clean(&self, cx: &DocContext) -> Span {
if *self == DUMMY_SP {
return Span::empty();
}
let cm = cx.sess().codemap();
let filename = cm.span_to_filename(*self);
let lo = cm.lookup_char_pos(self.lo());
let hi = cm.lookup_char_pos(self.hi());
Span {
filename,
loline: lo.line,
locol: lo.col.to_usize(),
hiline: hi.line,
hicol: hi.col.to_usize(),
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub struct Path {
pub global: bool,
pub def: Def,
pub segments: Vec<PathSegment>,
}
impl Path {
pub fn singleton(name: String) -> Path {
Path {
global: false,
def: Def::Err,
segments: vec![PathSegment {
name,
params: PathParameters::AngleBracketed {
lifetimes: Vec::new(),
types: Vec::new(),
bindings: Vec::new(),
}
}]
}
}
pub fn last_name(&self) -> &str {
self.segments.last().unwrap().name.as_str()
}
}
impl Clean<Path> for hir::Path {
fn clean(&self, cx: &DocContext) -> Path {
Path {
global: self.is_global(),
def: self.def,
segments: if self.is_global() { &self.segments[1..] } else { &self.segments }.clean(cx),
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub enum PathParameters {
AngleBracketed {
lifetimes: Vec<Lifetime>,
types: Vec<Type>,
bindings: Vec<TypeBinding>,
},
Parenthesized {
inputs: Vec<Type>,
output: Option<Type>,
}
}
impl Clean<PathParameters> for hir::PathParameters {
fn clean(&self, cx: &DocContext) -> PathParameters {
if self.parenthesized {
let output = self.bindings[0].ty.clean(cx);
PathParameters::Parenthesized {
inputs: self.inputs().clean(cx),
output: if output != Type::Tuple(Vec::new()) { Some(output) } else { None }
}
} else {
PathParameters::AngleBracketed {
lifetimes: if self.lifetimes.iter().all(|lt| lt.is_elided()) {
vec![]
} else {
self.lifetimes.clean(cx)
},
types: self.types.clean(cx),
bindings: self.bindings.clean(cx),
}
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub struct PathSegment {
pub name: String,
pub params: PathParameters,
}
impl Clean<PathSegment> for hir::PathSegment {
fn clean(&self, cx: &DocContext) -> PathSegment {
PathSegment {
name: self.name.clean(cx),
params: self.with_parameters(|parameters| parameters.clean(cx))
}
}
}
fn strip_type(ty: Type) -> Type {
match ty {
Type::ResolvedPath { path, typarams, did, is_generic } => {
Type::ResolvedPath { path: strip_path(&path), typarams, did, is_generic }
}
Type::Tuple(inner_tys) => {
Type::Tuple(inner_tys.iter().map(|t| strip_type(t.clone())).collect())
}
Type::Slice(inner_ty) => Type::Slice(Box::new(strip_type(*inner_ty))),
Type::Array(inner_ty, s) => Type::Array(Box::new(strip_type(*inner_ty)), s),
Type::Unique(inner_ty) => Type::Unique(Box::new(strip_type(*inner_ty))),
Type::RawPointer(m, inner_ty) => Type::RawPointer(m, Box::new(strip_type(*inner_ty))),
Type::BorrowedRef { lifetime, mutability, type_ } => {
Type::BorrowedRef { lifetime, mutability, type_: Box::new(strip_type(*type_)) }
}
Type::QPath { name, self_type, trait_ } => {
Type::QPath {
name,
self_type: Box::new(strip_type(*self_type)), trait_: Box::new(strip_type(*trait_))
}
}
_ => ty
}
}
fn strip_path(path: &Path) -> Path {
let segments = path.segments.iter().map(|s| {
PathSegment {
name: s.name.clone(),
params: PathParameters::AngleBracketed {
lifetimes: Vec::new(),
types: Vec::new(),
bindings: Vec::new(),
}
}
}).collect();
Path {
global: path.global,
def: path.def.clone(),
segments,
}
}
fn qpath_to_string(p: &hir::QPath) -> String {
let segments = match *p {
hir::QPath::Resolved(_, ref path) => &path.segments,
hir::QPath::TypeRelative(_, ref segment) => return segment.name.to_string(),
};
let mut s = String::new();
for (i, seg) in segments.iter().enumerate() {
if i > 0 {
s.push_str("::");
}
if seg.name != keywords::CrateRoot.name() {
s.push_str(&*seg.name.as_str());
}
}
s
}
impl Clean<String> for ast::Name {
fn clean(&self, _: &DocContext) -> String {
self.to_string()
}
}
impl Clean<String> for InternedString {
fn clean(&self, _: &DocContext) -> String {
self.to_string()
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Typedef {
pub type_: Type,
pub generics: Generics,
}
impl Clean<Item> for doctree::Typedef {
fn clean(&self, cx: &DocContext) -> Item {
Item {
name: Some(self.name.clean(cx)),
attrs: self.attrs.clean(cx),
source: self.whence.clean(cx),
def_id: cx.tcx.hir.local_def_id(self.id.clone()),
visibility: self.vis.clean(cx),
stability: self.stab.clean(cx),
deprecation: self.depr.clean(cx),
inner: TypedefItem(Typedef {
type_: self.ty.clean(cx),
generics: self.gen.clean(cx),
}, false),
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Debug, Hash)]
pub struct BareFunctionDecl {
pub unsafety: hir::Unsafety,
pub generic_params: Vec<GenericParamDef>,
pub decl: FnDecl,
pub abi: Abi,
}
impl Clean<BareFunctionDecl> for hir::BareFnTy {
fn clean(&self, cx: &DocContext) -> BareFunctionDecl {
let (generic_params, decl) = enter_impl_trait(cx, || {
(self.generic_params.clean(cx), (&*self.decl, &self.arg_names[..]).clean(cx))
});
BareFunctionDecl {
unsafety: self.unsafety,
decl,
generic_params,
abi: self.abi,
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Static {
pub type_: Type,
pub mutability: Mutability,
/// It's useful to have the value of a static documented, but I have no
/// desire to represent expressions (that'd basically be all of the AST,
/// which is huge!). So, have a string.
pub expr: String,
}
impl Clean<Item> for doctree::Static {
fn clean(&self, cx: &DocContext) -> Item {
debug!("cleaning static {}: {:?}", self.name.clean(cx), self);
Item {
name: Some(self.name.clean(cx)),
attrs: self.attrs.clean(cx),
source: self.whence.clean(cx),
def_id: cx.tcx.hir.local_def_id(self.id),
visibility: self.vis.clean(cx),
stability: self.stab.clean(cx),
deprecation: self.depr.clean(cx),
inner: StaticItem(Static {
type_: self.type_.clean(cx),
mutability: self.mutability.clean(cx),
expr: print_const_expr(cx, self.expr),
}),
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Constant {
pub type_: Type,
pub expr: String,
}
impl Clean<Item> for doctree::Constant {
fn clean(&self, cx: &DocContext) -> Item {
Item {
name: Some(self.name.clean(cx)),
attrs: self.attrs.clean(cx),
source: self.whence.clean(cx),
def_id: cx.tcx.hir.local_def_id(self.id),
visibility: self.vis.clean(cx),
stability: self.stab.clean(cx),
deprecation: self.depr.clean(cx),
inner: ConstantItem(Constant {
type_: self.type_.clean(cx),
expr: print_const_expr(cx, self.expr),
}),
}
}
}
#[derive(Debug, Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Copy, Hash)]
pub enum Mutability {
Mutable,
Immutable,
}
impl Clean<Mutability> for hir::Mutability {
fn clean(&self, _: &DocContext) -> Mutability {
match self {
&hir::MutMutable => Mutable,
&hir::MutImmutable => Immutable,
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Copy, Debug, Hash)]
pub enum ImplPolarity {
Positive,
Negative,
}
impl Clean<ImplPolarity> for hir::ImplPolarity {
fn clean(&self, _: &DocContext) -> ImplPolarity {
match self {
&hir::ImplPolarity::Positive => ImplPolarity::Positive,
&hir::ImplPolarity::Negative => ImplPolarity::Negative,
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Impl {
pub unsafety: hir::Unsafety,
pub generics: Generics,
pub provided_trait_methods: FxHashSet<String>,
pub trait_: Option<Type>,
pub for_: Type,
pub items: Vec<Item>,
pub polarity: Option<ImplPolarity>,
pub synthetic: bool,
}
pub fn get_auto_traits_with_node_id(cx: &DocContext, id: ast::NodeId, name: String) -> Vec<Item> {
let finder = AutoTraitFinder::new(cx);
finder.get_with_node_id(id, name)
}
pub fn get_auto_traits_with_def_id(cx: &DocContext, id: DefId) -> Vec<Item> {
let finder = AutoTraitFinder::new(cx);
finder.get_with_def_id(id)
}
impl Clean<Vec<Item>> for doctree::Impl {
fn clean(&self, cx: &DocContext) -> Vec<Item> {
let mut ret = Vec::new();
let trait_ = self.trait_.clean(cx);
let items = self.items.clean(cx);
// If this impl block is an implementation of the Deref trait, then we
// need to try inlining the target's inherent impl blocks as well.
if trait_.def_id() == cx.tcx.lang_items().deref_trait() {
build_deref_target_impls(cx, &items, &mut ret);
}
let provided = trait_.def_id().map(|did| {
cx.tcx.provided_trait_methods(did)
.into_iter()
.map(|meth| meth.name.to_string())
.collect()
}).unwrap_or(FxHashSet());
ret.push(Item {
name: None,
attrs: self.attrs.clean(cx),
source: self.whence.clean(cx),
def_id: cx.tcx.hir.local_def_id(self.id),
visibility: self.vis.clean(cx),
stability: self.stab.clean(cx),
deprecation: self.depr.clean(cx),
inner: ImplItem(Impl {
unsafety: self.unsafety,
generics: self.generics.clean(cx),
provided_trait_methods: provided,
trait_,
for_: self.for_.clean(cx),
items,
polarity: Some(self.polarity.clean(cx)),
synthetic: false,
})
});
ret
}
}
fn build_deref_target_impls(cx: &DocContext,
items: &[Item],
ret: &mut Vec<Item>) {
use self::PrimitiveType::*;
let tcx = cx.tcx;
for item in items {
let target = match item.inner {
TypedefItem(ref t, true) => &t.type_,
_ => continue,
};
let primitive = match *target {
ResolvedPath { did, .. } if did.is_local() => continue,
ResolvedPath { did, .. } => {
// We set the last parameter to false to avoid looking for auto-impls for traits
// and therefore avoid an ICE.
// The reason behind this is that auto-traits don't propagate through Deref so
// we're not supposed to synthesise impls for them.
ret.extend(inline::build_impls(cx, did, false));
continue
}
_ => match target.primitive_type() {
Some(prim) => prim,
None => continue,
}
};
let did = match primitive {
Isize => tcx.lang_items().isize_impl(),
I8 => tcx.lang_items().i8_impl(),
I16 => tcx.lang_items().i16_impl(),
I32 => tcx.lang_items().i32_impl(),
I64 => tcx.lang_items().i64_impl(),
I128 => tcx.lang_items().i128_impl(),
Usize => tcx.lang_items().usize_impl(),
U8 => tcx.lang_items().u8_impl(),
U16 => tcx.lang_items().u16_impl(),
U32 => tcx.lang_items().u32_impl(),
U64 => tcx.lang_items().u64_impl(),
U128 => tcx.lang_items().u128_impl(),
F32 => tcx.lang_items().f32_impl(),
F64 => tcx.lang_items().f64_impl(),
Char => tcx.lang_items().char_impl(),
Bool => None,
Str => tcx.lang_items().str_impl(),
Slice => tcx.lang_items().slice_impl(),
Array => tcx.lang_items().slice_impl(),
Tuple => None,
Unit => None,
RawPointer => tcx.lang_items().const_ptr_impl(),
Reference => None,
Fn => None,
Never => None,
};
if let Some(did) = did {
if !did.is_local() {
inline::build_impl(cx, did, ret);
}
}
}
}
impl Clean<Item> for doctree::ExternCrate {
fn clean(&self, cx: &DocContext) -> Item {
Item {
name: None,
attrs: self.attrs.clean(cx),
source: self.whence.clean(cx),
def_id: DefId { krate: self.cnum, index: CRATE_DEF_INDEX },
visibility: self.vis.clean(cx),
stability: None,
deprecation: None,
inner: ExternCrateItem(self.name.clean(cx), self.path.clone())
}
}
}
impl Clean<Vec<Item>> for doctree::Import {
fn clean(&self, cx: &DocContext) -> Vec<Item> {
// We consider inlining the documentation of `pub use` statements, but we
// forcefully don't inline if this is not public or if the
// #[doc(no_inline)] attribute is present.
// Don't inline doc(hidden) imports so they can be stripped at a later stage.
let denied = self.vis != hir::Public || self.attrs.iter().any(|a| {
a.name() == "doc" && match a.meta_item_list() {
Some(l) => attr::list_contains_name(&l, "no_inline") ||
attr::list_contains_name(&l, "hidden"),
None => false,
}
});
let path = self.path.clean(cx);
let inner = if self.glob {
Import::Glob(resolve_use_source(cx, path))
} else {
let name = self.name;
if !denied {
let mut visited = FxHashSet();
if let Some(items) = inline::try_inline(cx, path.def, name, &mut visited) {
return items;
}
}
Import::Simple(name.clean(cx), resolve_use_source(cx, path))
};
vec![Item {
name: None,
attrs: self.attrs.clean(cx),
source: self.whence.clean(cx),
def_id: cx.tcx.hir.local_def_id(ast::CRATE_NODE_ID),
visibility: self.vis.clean(cx),
stability: None,
deprecation: None,
inner: ImportItem(inner)
}]
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub enum Import {
// use source as str;
Simple(String, ImportSource),
// use source::*;
Glob(ImportSource)
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct ImportSource {
pub path: Path,
pub did: Option<DefId>,
}
impl Clean<Vec<Item>> for hir::ForeignMod {
fn clean(&self, cx: &DocContext) -> Vec<Item> {
let mut items = self.items.clean(cx);
for item in &mut items {
if let ForeignFunctionItem(ref mut f) = item.inner {
f.abi = self.abi;
}
}
items
}
}
impl Clean<Item> for hir::ForeignItem {
fn clean(&self, cx: &DocContext) -> Item {
let inner = match self.node {
hir::ForeignItemFn(ref decl, ref names, ref generics) => {
let (generics, decl) = enter_impl_trait(cx, || {
(generics.clean(cx), (&**decl, &names[..]).clean(cx))
});
ForeignFunctionItem(Function {
decl,
generics,
unsafety: hir::Unsafety::Unsafe,
abi: Abi::Rust,
constness: hir::Constness::NotConst,
})
}
hir::ForeignItemStatic(ref ty, mutbl) => {
ForeignStaticItem(Static {
type_: ty.clean(cx),
mutability: if mutbl {Mutable} else {Immutable},
expr: "".to_string(),
})
}
hir::ForeignItemType => {
ForeignTypeItem
}
};
Item {
name: Some(self.name.clean(cx)),
attrs: self.attrs.clean(cx),
source: self.span.clean(cx),
def_id: cx.tcx.hir.local_def_id(self.id),
visibility: self.vis.clean(cx),
stability: get_stability(cx, cx.tcx.hir.local_def_id(self.id)),
deprecation: get_deprecation(cx, cx.tcx.hir.local_def_id(self.id)),
inner,
}
}
}
// Utilities
trait ToSource {
fn to_src(&self, cx: &DocContext) -> String;
}
impl ToSource for syntax_pos::Span {
fn to_src(&self, cx: &DocContext) -> String {
debug!("converting span {:?} to snippet", self.clean(cx));
let sn = match cx.sess().codemap().span_to_snippet(*self) {
Ok(x) => x.to_string(),
Err(_) => "".to_string()
};
debug!("got snippet {}", sn);
sn
}
}
fn name_from_pat(p: &hir::Pat) -> String {
use rustc::hir::*;
debug!("Trying to get a name from pattern: {:?}", p);
match p.node {
PatKind::Wild => "_".to_string(),
PatKind::Binding(_, _, ref p, _) => p.node.to_string(),
PatKind::TupleStruct(ref p, ..) | PatKind::Path(ref p) => qpath_to_string(p),
PatKind::Struct(ref name, ref fields, etc) => {
format!("{} {{ {}{} }}", qpath_to_string(name),
fields.iter().map(|&Spanned { node: ref fp, .. }|
format!("{}: {}", fp.ident, name_from_pat(&*fp.pat)))
.collect::<Vec<String>>().join(", "),
if etc { ", ..." } else { "" }
)
}
PatKind::Tuple(ref elts, _) => format!("({})", elts.iter().map(|p| name_from_pat(&**p))
.collect::<Vec<String>>().join(", ")),
PatKind::Box(ref p) => name_from_pat(&**p),
PatKind::Ref(ref p, _) => name_from_pat(&**p),
PatKind::Lit(..) => {
warn!("tried to get argument name from PatKind::Lit, \
which is silly in function arguments");
"()".to_string()
},
PatKind::Range(..) => panic!("tried to get argument name from PatKind::Range, \
which is not allowed in function arguments"),
PatKind::Slice(ref begin, ref mid, ref end) => {
let begin = begin.iter().map(|p| name_from_pat(&**p));
let mid = mid.as_ref().map(|p| format!("..{}", name_from_pat(&**p))).into_iter();
let end = end.iter().map(|p| name_from_pat(&**p));
format!("[{}]", begin.chain(mid).chain(end).collect::<Vec<_>>().join(", "))
},
}
}
fn print_const(cx: &DocContext, n: &ty::Const) -> String {
match n.val {
ConstVal::Unevaluated(def_id, _) => {
if let Some(node_id) = cx.tcx.hir.as_local_node_id(def_id) {
print_const_expr(cx, cx.tcx.hir.body_owned_by(node_id))
} else {
inline::print_inlined_const(cx, def_id)
}
},
ConstVal::Value(..) => {
let mut s = String::new();
::rustc::mir::fmt_const_val(&mut s, n).unwrap();
// array lengths are obviously usize
if s.ends_with("usize") {
let n = s.len() - "usize".len();
s.truncate(n);
}
s
},
}
}
fn print_const_expr(cx: &DocContext, body: hir::BodyId) -> String {
cx.tcx.hir.node_to_pretty_string(body.node_id)
}
/// Given a type Path, resolve it to a Type using the TyCtxt
fn resolve_type(cx: &DocContext,
path: Path,
id: ast::NodeId) -> Type {
if id == ast::DUMMY_NODE_ID {
debug!("resolve_type({:?})", path);
} else {
debug!("resolve_type({:?},{:?})", path, id);
}
let is_generic = match path.def {
Def::PrimTy(p) => match p {
hir::TyStr => return Primitive(PrimitiveType::Str),
hir::TyBool => return Primitive(PrimitiveType::Bool),
hir::TyChar => return Primitive(PrimitiveType::Char),
hir::TyInt(int_ty) => return Primitive(int_ty.into()),
hir::TyUint(uint_ty) => return Primitive(uint_ty.into()),
hir::TyFloat(float_ty) => return Primitive(float_ty.into()),
},
Def::SelfTy(..) if path.segments.len() == 1 => {
return Generic(keywords::SelfType.name().to_string());
}
Def::TyParam(..) if path.segments.len() == 1 => {
return Generic(format!("{:#}", path));
}
Def::SelfTy(..) | Def::TyParam(..) | Def::AssociatedTy(..) => true,
_ => false,
};
let did = register_def(&*cx, path.def);
ResolvedPath { path: path, typarams: None, did: did, is_generic: is_generic }
}
fn register_def(cx: &DocContext, def: Def) -> DefId {
debug!("register_def({:?})", def);
let (did, kind) = match def {
Def::Fn(i) => (i, TypeKind::Function),
Def::TyAlias(i) => (i, TypeKind::Typedef),
Def::Enum(i) => (i, TypeKind::Enum),
Def::Trait(i) => (i, TypeKind::Trait),
Def::Struct(i) => (i, TypeKind::Struct),
Def::Union(i) => (i, TypeKind::Union),
Def::Mod(i) => (i, TypeKind::Module),
Def::TyForeign(i) => (i, TypeKind::Foreign),
Def::Const(i) => (i, TypeKind::Const),
Def::Static(i, _) => (i, TypeKind::Static),
Def::Variant(i) => (cx.tcx.parent_def_id(i).unwrap(), TypeKind::Enum),
Def::Macro(i, _) => (i, TypeKind::Macro),
Def::SelfTy(Some(def_id), _) => (def_id, TypeKind::Trait),
Def::SelfTy(_, Some(impl_def_id)) => {
return impl_def_id
}
_ => return def.def_id()
};
if did.is_local() { return did }
inline::record_extern_fqn(cx, did, kind);
if let TypeKind::Trait = kind {
inline::record_extern_trait(cx, did);
}
did
}
fn resolve_use_source(cx: &DocContext, path: Path) -> ImportSource {
ImportSource {
did: if path.def == Def::Err {
None
} else {
Some(register_def(cx, path.def))
},
path,
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Macro {
pub source: String,
pub imported_from: Option<String>,
}
impl Clean<Item> for doctree::Macro {
fn clean(&self, cx: &DocContext) -> Item {
let name = self.name.clean(cx);
Item {
name: Some(name.clone()),
attrs: self.attrs.clean(cx),
source: self.whence.clean(cx),
visibility: Some(Public),
stability: self.stab.clean(cx),
deprecation: self.depr.clean(cx),
def_id: self.def_id,
inner: MacroItem(Macro {
source: format!("macro_rules! {} {{\n{}}}",
name,
self.matchers.iter().map(|span| {
format!(" {} => {{ ... }};\n", span.to_src(cx))
}).collect::<String>()),
imported_from: self.imported_from.clean(cx),
}),
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Stability {
pub level: stability::StabilityLevel,
pub feature: String,
pub since: String,
pub deprecated_since: String,
pub deprecated_reason: String,
pub unstable_reason: String,
pub issue: Option<u32>
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct Deprecation {
pub since: String,
pub note: String,
}
impl Clean<Stability> for attr::Stability {
fn clean(&self, _: &DocContext) -> Stability {
Stability {
level: stability::StabilityLevel::from_attr_level(&self.level),
feature: self.feature.to_string(),
since: match self.level {
attr::Stable {ref since} => since.to_string(),
_ => "".to_string(),
},
deprecated_since: match self.rustc_depr {
Some(attr::RustcDeprecation {ref since, ..}) => since.to_string(),
_=> "".to_string(),
},
deprecated_reason: match self.rustc_depr {
Some(ref depr) => depr.reason.to_string(),
_ => "".to_string(),
},
unstable_reason: match self.level {
attr::Unstable { reason: Some(ref reason), .. } => reason.to_string(),
_ => "".to_string(),
},
issue: match self.level {
attr::Unstable {issue, ..} => Some(issue),
_ => None,
}
}
}
}
impl<'a> Clean<Stability> for &'a attr::Stability {
fn clean(&self, dc: &DocContext) -> Stability {
(**self).clean(dc)
}
}
impl Clean<Deprecation> for attr::Deprecation {
fn clean(&self, _: &DocContext) -> Deprecation {
Deprecation {
since: self.since.as_ref().map_or("".to_string(), |s| s.to_string()),
note: self.note.as_ref().map_or("".to_string(), |s| s.to_string()),
}
}
}
/// An equality constraint on an associated type, e.g. `A=Bar` in `Foo<A=Bar>`
#[derive(Clone, PartialEq, Eq, RustcDecodable, RustcEncodable, Debug, Hash)]
pub struct TypeBinding {
pub name: String,
pub ty: Type
}
impl Clean<TypeBinding> for hir::TypeBinding {
fn clean(&self, cx: &DocContext) -> TypeBinding {
TypeBinding {
name: self.name.clean(cx),
ty: self.ty.clean(cx)
}
}
}
pub fn def_id_to_path(cx: &DocContext, did: DefId, name: Option<String>) -> Vec<String> {
let crate_name = name.unwrap_or_else(|| cx.tcx.crate_name(did.krate).to_string());
let relative = cx.tcx.def_path(did).data.into_iter().filter_map(|elem| {
// extern blocks have an empty name
let s = elem.data.to_string();
if !s.is_empty() {
Some(s)
} else {
None
}
});
once(crate_name).chain(relative).collect()
}
pub fn enter_impl_trait<F, R>(cx: &DocContext, f: F) -> R
where
F: FnOnce() -> R,
{
let old_bounds = mem::replace(&mut *cx.impl_trait_bounds.borrow_mut(), Default::default());
let r = f();
assert!(cx.impl_trait_bounds.borrow().is_empty());
*cx.impl_trait_bounds.borrow_mut() = old_bounds;
r
}
// Start of code copied from rust-clippy
pub fn get_trait_def_id(tcx: &TyCtxt, path: &[&str], use_local: bool) -> Option<DefId> {
if use_local {
path_to_def_local(tcx, path)
} else {
path_to_def(tcx, path)
}
}
pub fn path_to_def_local(tcx: &TyCtxt, path: &[&str]) -> Option<DefId> {
let krate = tcx.hir.krate();
let mut items = krate.module.item_ids.clone();
let mut path_it = path.iter().peekable();
loop {
let segment = match path_it.next() {
Some(segment) => segment,
None => return None,
};
for item_id in mem::replace(&mut items, HirVec::new()).iter() {
let item = tcx.hir.expect_item(item_id.id);
if item.name == *segment {
if path_it.peek().is_none() {
return Some(tcx.hir.local_def_id(item_id.id))
}
items = match &item.node {
&hir::ItemMod(ref m) => m.item_ids.clone(),
_ => panic!("Unexpected item {:?} in path {:?} path")
};
break;
}
}
}
}
pub fn path_to_def(tcx: &TyCtxt, path: &[&str]) -> Option<DefId> {
let crates = tcx.crates();
let krate = crates
.iter()
.find(|&&krate| tcx.crate_name(krate) == path[0]);
if let Some(krate) = krate {
let krate = DefId {
krate: *krate,
index: CRATE_DEF_INDEX,
};
let mut items = tcx.item_children(krate);
let mut path_it = path.iter().skip(1).peekable();
loop {
let segment = match path_it.next() {
Some(segment) => segment,
None => return None,
};
for item in mem::replace(&mut items, Lrc::new(vec![])).iter() {
if item.ident.name == *segment {
if path_it.peek().is_none() {
return match item.def {
def::Def::Trait(did) => Some(did),
_ => None,
}
}
items = tcx.item_children(item.def.def_id());
break;
}
}
}
} else {
None
}
}
fn get_path_for_type<F>(tcx: TyCtxt, def_id: DefId, def_ctor: F) -> hir::Path
where F: Fn(DefId) -> Def {
struct AbsolutePathBuffer {
names: Vec<String>,
}
impl ty::item_path::ItemPathBuffer for AbsolutePathBuffer {
fn root_mode(&self) -> &ty::item_path::RootMode {
const ABSOLUTE: &'static ty::item_path::RootMode = &ty::item_path::RootMode::Absolute;
ABSOLUTE
}
fn push(&mut self, text: &str) {
self.names.push(text.to_owned());
}
}
let mut apb = AbsolutePathBuffer { names: vec![] };
tcx.push_item_path(&mut apb, def_id);
hir::Path {
span: DUMMY_SP,
def: def_ctor(def_id),
segments: hir::HirVec::from_vec(apb.names.iter().map(|s| hir::PathSegment {
name: ast::Name::intern(&s),
parameters: None,
infer_types: false,
}).collect())
}
}
// End of code copied from rust-clippy
#[derive(Eq, PartialEq, Hash, Copy, Clone, Debug)]
enum RegionTarget<'tcx> {
Region(Region<'tcx>),
RegionVid(RegionVid)
}
#[derive(Default, Debug, Clone)]
struct RegionDeps<'tcx> {
larger: FxHashSet<RegionTarget<'tcx>>,
smaller: FxHashSet<RegionTarget<'tcx>>
}
#[derive(Eq, PartialEq, Hash, Debug)]
enum SimpleBound {
RegionBound(Lifetime),
TraitBound(Vec<PathSegment>, Vec<SimpleBound>, Vec<GenericParamDef>, hir::TraitBoundModifier)
}
enum AutoTraitResult {
ExplicitImpl,
PositiveImpl(Generics),
NegativeImpl,
}
impl AutoTraitResult {
fn is_auto(&self) -> bool {
match *self {
AutoTraitResult::PositiveImpl(_) | AutoTraitResult::NegativeImpl => true,
_ => false,
}
}
}
impl From<TyParamBound> for SimpleBound {
fn from(bound: TyParamBound) -> Self {
match bound.clone() {
TyParamBound::RegionBound(l) => SimpleBound::RegionBound(l),
TyParamBound::TraitBound(t, mod_) => match t.trait_ {
Type::ResolvedPath { path, typarams, .. } => {
SimpleBound::TraitBound(path.segments,
typarams
.map_or_else(|| Vec::new(), |v| v.iter()
.map(|p| SimpleBound::from(p.clone()))
.collect()),
t.generic_params,
mod_)
}
_ => panic!("Unexpected bound {:?}", bound),
}
}
}
}
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