rust/src/librustdoc/visit_lib.rs
Zack M. Davis 1b6c9605e4 use field init shorthand EVERYWHERE
Like #43008 (f668999), but _much more aggressive_.
2017-08-15 15:29:17 -07:00

98 lines
3.3 KiB
Rust

// Copyright 2016 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.
use rustc::middle::cstore::CrateStore;
use rustc::middle::privacy::{AccessLevels, AccessLevel};
use rustc::hir::def::Def;
use rustc::hir::def_id::{CrateNum, CRATE_DEF_INDEX, DefId};
use rustc::ty::Visibility;
use rustc::util::nodemap::FxHashSet;
use std::cell::RefMut;
use clean::{AttributesExt, NestedAttributesExt};
// FIXME: this may not be exhaustive, but is sufficient for rustdocs current uses
/// Similar to `librustc_privacy::EmbargoVisitor`, but also takes
/// specific rustdoc annotations into account (i.e. `doc(hidden)`)
pub struct LibEmbargoVisitor<'a, 'b: 'a, 'tcx: 'b> {
cx: &'a ::core::DocContext<'b, 'tcx>,
cstore: &'a CrateStore,
// Accessibility levels for reachable nodes
access_levels: RefMut<'a, AccessLevels<DefId>>,
// Previous accessibility level, None means unreachable
prev_level: Option<AccessLevel>,
// Keeps track of already visited modules, in case a module re-exports its parent
visited_mods: FxHashSet<DefId>,
}
impl<'a, 'b, 'tcx> LibEmbargoVisitor<'a, 'b, 'tcx> {
pub fn new(cx: &'a ::core::DocContext<'b, 'tcx>) -> LibEmbargoVisitor<'a, 'b, 'tcx> {
LibEmbargoVisitor {
cx,
cstore: &*cx.sess().cstore,
access_levels: cx.access_levels.borrow_mut(),
prev_level: Some(AccessLevel::Public),
visited_mods: FxHashSet()
}
}
pub fn visit_lib(&mut self, cnum: CrateNum) {
let did = DefId { krate: cnum, index: CRATE_DEF_INDEX };
self.update(did, Some(AccessLevel::Public));
self.visit_mod(did);
}
// Updates node level and returns the updated level
fn update(&mut self, did: DefId, level: Option<AccessLevel>) -> Option<AccessLevel> {
let is_hidden = self.cx.tcx.get_attrs(did).lists("doc").has_word("hidden");
let old_level = self.access_levels.map.get(&did).cloned();
// Accessibility levels can only grow
if level > old_level && !is_hidden {
self.access_levels.map.insert(did, level.unwrap());
level
} else {
old_level
}
}
pub fn visit_mod(&mut self, def_id: DefId) {
if !self.visited_mods.insert(def_id) {
return;
}
for item in self.cstore.item_children(def_id, self.cx.tcx.sess) {
self.visit_item(item.def);
}
}
fn visit_item(&mut self, def: Def) {
let def_id = def.def_id();
let vis = self.cstore.visibility(def_id);
let inherited_item_level = if vis == Visibility::Public {
self.prev_level
} else {
None
};
let item_level = self.update(def_id, inherited_item_level);
if let Def::Mod(..) = def {
let orig_level = self.prev_level;
self.prev_level = item_level;
self.visit_mod(def_id);
self.prev_level = orig_level;
}
}
}