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|
//! Strip all doc(hidden) items from the output.
use rustc_hir::def_id::LocalDefId;
use rustc_middle::ty::TyCtxt;
use rustc_span::symbol::sym;
use std::mem;
use crate::clean;
use crate::clean::{Item, ItemIdSet, NestedAttributesExt};
use crate::core::DocContext;
use crate::fold::{strip_item, DocFolder};
use crate::passes::{ImplStripper, Pass};
use crate::visit_ast::inherits_doc_hidden;
pub(crate) const STRIP_HIDDEN: Pass = Pass {
name: "strip-hidden",
run: strip_hidden,
description: "strips all `#[doc(hidden)]` items from the output",
};
/// Strip items marked `#[doc(hidden)]`
pub(crate) fn strip_hidden(krate: clean::Crate, cx: &mut DocContext<'_>) -> clean::Crate {
let mut retained = ItemIdSet::default();
let is_json_output = cx.output_format.is_json() && !cx.show_coverage;
// strip all #[doc(hidden)] items
let krate = {
let mut stripper = Stripper {
retained: &mut retained,
update_retained: true,
tcx: cx.tcx,
is_in_hidden_item: false,
last_reexport: None,
};
stripper.fold_crate(krate)
};
// strip all impls referencing stripped items
let mut stripper = ImplStripper {
tcx: cx.tcx,
retained: &retained,
cache: &cx.cache,
is_json_output,
document_private: cx.render_options.document_private,
};
stripper.fold_crate(krate)
}
struct Stripper<'a, 'tcx> {
retained: &'a mut ItemIdSet,
update_retained: bool,
tcx: TyCtxt<'tcx>,
is_in_hidden_item: bool,
last_reexport: Option<LocalDefId>,
}
impl<'a, 'tcx> Stripper<'a, 'tcx> {
fn set_last_reexport_then_fold_item(&mut self, i: Item) -> Item {
let prev_from_reexport = self.last_reexport;
if i.inline_stmt_id.is_some() {
self.last_reexport = i.item_id.as_def_id().and_then(|def_id| def_id.as_local());
}
let ret = self.fold_item_recur(i);
self.last_reexport = prev_from_reexport;
ret
}
fn set_is_in_hidden_item_and_fold(&mut self, is_in_hidden_item: bool, i: Item) -> Item {
let prev = self.is_in_hidden_item;
self.is_in_hidden_item |= is_in_hidden_item;
let ret = self.set_last_reexport_then_fold_item(i);
self.is_in_hidden_item = prev;
ret
}
/// In case `i` is a non-hidden impl block, then we special-case it by changing the value
/// of `is_in_hidden_item` to `true` because the impl children inherit its visibility.
fn recurse_in_impl_or_exported_macro(&mut self, i: Item) -> Item {
let prev = mem::replace(&mut self.is_in_hidden_item, false);
let ret = self.set_last_reexport_then_fold_item(i);
self.is_in_hidden_item = prev;
ret
}
}
impl<'a, 'tcx> DocFolder for Stripper<'a, 'tcx> {
fn fold_item(&mut self, i: Item) -> Option<Item> {
let has_doc_hidden = i.attrs.lists(sym::doc).has_word(sym::hidden);
let is_impl_or_exported_macro = match *i.kind {
clean::ImplItem(..) => true,
// If the macro has the `#[macro_export]` attribute, it means it's accessible at the
// crate level so it should be handled differently.
clean::MacroItem(..) => {
i.attrs.other_attrs.iter().any(|attr| attr.has_name(sym::macro_export))
}
_ => false,
};
let mut is_hidden = has_doc_hidden;
if !is_impl_or_exported_macro {
is_hidden = self.is_in_hidden_item || has_doc_hidden;
if !is_hidden && i.inline_stmt_id.is_none() {
// `i.inline_stmt_id` is `Some` if the item is directly reexported. If it is, we
// don't need to check it, because the reexport itself was already checked.
//
// If this item is the child of a reexported module, `self.last_reexport` will be
// `Some` even though `i.inline_stmt_id` is `None`. Hiddenness inheritance needs to
// account for the possibility that an item's true parent module is hidden, but it's
// inlined into a visible module true. This code shouldn't be reachable if the
// module's reexport is itself hidden, for the same reason it doesn't need to be
// checked if `i.inline_stmt_id` is Some: hidden reexports are never inlined.
is_hidden = i
.item_id
.as_def_id()
.and_then(|def_id| def_id.as_local())
.map(|def_id| inherits_doc_hidden(self.tcx, def_id, self.last_reexport))
.unwrap_or(false);
}
}
if !is_hidden {
if self.update_retained {
self.retained.insert(i.item_id);
}
return Some(if is_impl_or_exported_macro {
self.recurse_in_impl_or_exported_macro(i)
} else {
self.set_is_in_hidden_item_and_fold(false, i)
});
}
debug!("strip_hidden: stripping {:?} {:?}", i.type_(), i.name);
// Use a dedicated hidden item for fields, variants, and modules.
// We need to keep private fields and variants, so that the docs
// can show a placeholder "// some variants omitted". We need to keep
// private modules, because they can contain impl blocks, and impl
// block privacy is inherited from the type and trait, not from the
// module it's defined in. Both of these are marked "stripped," and
// not included in the final docs, but since they still have an effect
// on the final doc, cannot be completely removed from the Clean IR.
match *i.kind {
clean::StructFieldItem(..) | clean::ModuleItem(..) | clean::VariantItem(..) => {
// We need to recurse into stripped modules to
// strip things like impl methods but when doing so
// we must not add any items to the `retained` set.
let old = mem::replace(&mut self.update_retained, false);
let ret = self.set_is_in_hidden_item_and_fold(true, i);
self.update_retained = old;
if ret.is_crate() {
// We don't strip the crate, even if it has `#[doc(hidden)]`.
Some(ret)
} else {
Some(strip_item(ret))
}
}
_ => {
let ret = self.set_is_in_hidden_item_and_fold(true, i);
if has_doc_hidden {
// If the item itself has `#[doc(hidden)]`, then we simply remove it.
None
} else {
// However if it's a "descendant" of a `#[doc(hidden)]` item, then we strip it.
Some(strip_item(ret))
}
}
}
}
}
|
