/
visit_ast.rs
463 lines (430 loc) · 17 KB
/
visit_ast.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.
//! Rust AST Visitor. Extracts useful information and massages it into a form
//! usable for clean
use std::collections::HashSet;
use std::mem;
use syntax::abi;
use syntax::ast;
use syntax::attr;
use syntax::attr::AttrMetaMethods;
use syntax::codemap::Span;
use rustc::front::map as hir_map;
use rustc::middle::stability;
use rustc_front::hir;
use core;
use clean::{Clean, Attributes};
use doctree::*;
// looks to me like the first two of these are actually
// output parameters, maybe only mutated once; perhaps
// better simply to have the visit method return a tuple
// containing them?
// also, is there some reason that this doesn't use the 'visit'
// framework from syntax?
pub struct RustdocVisitor<'a, 'tcx: 'a> {
pub module: Module,
pub attrs: hir::HirVec<ast::Attribute>,
pub cx: &'a core::DocContext<'a, 'tcx>,
pub analysis: Option<&'a core::CrateAnalysis>,
view_item_stack: HashSet<ast::NodeId>,
inlining_from_glob: bool,
}
impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
pub fn new(cx: &'a core::DocContext<'a, 'tcx>,
analysis: Option<&'a core::CrateAnalysis>) -> RustdocVisitor<'a, 'tcx> {
// If the root is reexported, terminate all recursion.
let mut stack = HashSet::new();
stack.insert(ast::CRATE_NODE_ID);
RustdocVisitor {
module: Module::new(None),
attrs: hir::HirVec::new(),
cx: cx,
analysis: analysis,
view_item_stack: stack,
inlining_from_glob: false,
}
}
fn stability(&self, id: ast::NodeId) -> Option<attr::Stability> {
self.cx.tcx_opt().and_then(|tcx| {
self.cx.map.opt_local_def_id(id)
.and_then(|def_id| stability::lookup_stability(tcx, def_id))
.cloned()
})
}
fn deprecation(&self, id: ast::NodeId) -> Option<attr::Deprecation> {
self.cx.tcx_opt().and_then(|tcx| {
self.cx.map.opt_local_def_id(id)
.and_then(|def_id| stability::lookup_deprecation(tcx, def_id))
})
}
pub fn visit(&mut self, krate: &hir::Crate) {
self.attrs = krate.attrs.clone();
self.module = self.visit_mod_contents(krate.span,
krate.attrs.clone(),
hir::Public,
ast::CRATE_NODE_ID,
&krate.module,
None);
// attach the crate's exported macros to the top-level module:
self.module.macros = krate.exported_macros.iter()
.map(|def| self.visit_macro(def)).collect();
self.module.is_crate = true;
}
pub fn visit_variant_data(&mut self, item: &hir::Item,
name: ast::Name, sd: &hir::VariantData,
generics: &hir::Generics) -> Struct {
debug!("Visiting struct");
let struct_type = struct_type_from_def(&*sd);
Struct {
id: item.id,
struct_type: struct_type,
name: name,
vis: item.vis,
stab: self.stability(item.id),
depr: self.deprecation(item.id),
attrs: item.attrs.clone(),
generics: generics.clone(),
fields: sd.fields().iter().cloned().collect(),
whence: item.span
}
}
pub fn visit_enum_def(&mut self, it: &hir::Item,
name: ast::Name, def: &hir::EnumDef,
params: &hir::Generics) -> Enum {
debug!("Visiting enum");
Enum {
name: name,
variants: def.variants.iter().map(|v| Variant {
name: v.node.name,
attrs: v.node.attrs.clone(),
stab: self.stability(v.node.data.id()),
depr: self.deprecation(v.node.data.id()),
def: v.node.data.clone(),
whence: v.span,
}).collect(),
vis: it.vis,
stab: self.stability(it.id),
depr: self.deprecation(it.id),
generics: params.clone(),
attrs: it.attrs.clone(),
id: it.id,
whence: it.span,
}
}
pub fn visit_fn(&mut self, item: &hir::Item,
name: ast::Name, fd: &hir::FnDecl,
unsafety: &hir::Unsafety,
constness: hir::Constness,
abi: &abi::Abi,
gen: &hir::Generics) -> Function {
debug!("Visiting fn");
Function {
id: item.id,
vis: item.vis,
stab: self.stability(item.id),
depr: self.deprecation(item.id),
attrs: item.attrs.clone(),
decl: fd.clone(),
name: name,
whence: item.span,
generics: gen.clone(),
unsafety: *unsafety,
constness: constness,
abi: *abi,
}
}
pub fn visit_mod_contents(&mut self, span: Span, attrs: hir::HirVec<ast::Attribute>,
vis: hir::Visibility, id: ast::NodeId,
m: &hir::Mod,
name: Option<ast::Name>) -> Module {
let mut om = Module::new(name);
om.where_outer = span;
om.where_inner = m.inner;
om.attrs = attrs;
om.vis = vis;
om.stab = self.stability(id);
om.depr = self.deprecation(id);
om.id = id;
for i in &m.item_ids {
let item = self.cx.map.expect_item(i.id);
self.visit_item(item, None, &mut om);
}
om
}
fn visit_view_path(&mut self, path: hir::ViewPath_,
om: &mut Module,
id: ast::NodeId,
please_inline: bool) -> Option<hir::ViewPath_> {
match path {
hir::ViewPathSimple(dst, base) => {
if self.maybe_inline_local(id, Some(dst), false, om, please_inline) {
None
} else {
Some(hir::ViewPathSimple(dst, base))
}
}
hir::ViewPathList(p, paths) => {
let mine = paths.into_iter().filter(|path| {
!self.maybe_inline_local(path.node.id(), None, false, om,
please_inline)
}).collect::<hir::HirVec<hir::PathListItem>>();
if mine.is_empty() {
None
} else {
Some(hir::ViewPathList(p, mine))
}
}
hir::ViewPathGlob(base) => {
if self.maybe_inline_local(id, None, true, om, please_inline) {
None
} else {
Some(hir::ViewPathGlob(base))
}
}
}
}
/// Tries to resolve the target of a `pub use` statement and inlines the
/// target if it is defined locally and would not be documented otherwise,
/// or when it is specifically requested with `please_inline`.
/// (the latter is the case when the import is marked `doc(inline)`)
///
/// Cross-crate inlining occurs later on during crate cleaning
/// and follows different rules.
///
/// Returns true if the target has been inlined.
fn maybe_inline_local(&mut self, id: ast::NodeId, renamed: Option<ast::Name>,
glob: bool, om: &mut Module, please_inline: bool) -> bool {
fn inherits_doc_hidden(cx: &core::DocContext, mut node: ast::NodeId) -> bool {
while let Some(id) = cx.map.get_enclosing_scope(node) {
node = id;
let attrs = cx.map.attrs(node).clean(cx);
if attrs.list("doc").has_word("hidden") {
return true;
}
if node == ast::CRATE_NODE_ID {
break;
}
}
false
}
let tcx = match self.cx.tcx_opt() {
Some(tcx) => tcx,
None => return false
};
let def = tcx.def_map.borrow()[&id].def_id();
let def_node_id = match tcx.map.as_local_node_id(def) {
Some(n) => n, None => return false
};
let analysis = match self.analysis {
Some(analysis) => analysis, None => return false
};
let use_attrs = tcx.map.attrs(id).clean(self.cx);
let is_private = !analysis.access_levels.is_public(def);
let is_hidden = inherits_doc_hidden(self.cx, def_node_id);
let is_no_inline = use_attrs.list("doc").has_word("no_inline");
// Only inline if requested or if the item would otherwise be stripped
if (!please_inline && !is_private && !is_hidden) || is_no_inline {
return false
}
if !self.view_item_stack.insert(def_node_id) { return false }
let ret = match tcx.map.get(def_node_id) {
hir_map::NodeItem(it) => {
if glob {
let prev = mem::replace(&mut self.inlining_from_glob, true);
match it.node {
hir::ItemMod(ref m) => {
for i in &m.item_ids {
let i = self.cx.map.expect_item(i.id);
self.visit_item(i, None, om);
}
}
hir::ItemEnum(..) => {}
_ => { panic!("glob not mapped to a module or enum"); }
}
self.inlining_from_glob = prev;
} else {
self.visit_item(it, renamed, om);
}
true
}
_ => false,
};
self.view_item_stack.remove(&def_node_id);
return ret;
}
pub fn visit_item(&mut self, item: &hir::Item,
renamed: Option<ast::Name>, om: &mut Module) {
debug!("Visiting item {:?}", item);
let name = renamed.unwrap_or(item.name);
match item.node {
hir::ItemExternCrate(ref p) => {
om.extern_crates.push(ExternCrate {
name: name,
path: p.map(|x|x.to_string()),
vis: item.vis,
attrs: item.attrs.clone(),
whence: item.span,
})
}
hir::ItemUse(ref vpath) => {
let node = vpath.node.clone();
let node = if item.vis == hir::Public {
let please_inline = item.attrs.iter().any(|item| {
match item.meta_item_list() {
Some(list) if &item.name()[..] == "doc" => {
list.iter().any(|i| &i.name()[..] == "inline")
}
_ => false,
}
});
match self.visit_view_path(node, om, item.id, please_inline) {
None => return,
Some(p) => p
}
} else {
node
};
om.imports.push(Import {
id: item.id,
vis: item.vis,
attrs: item.attrs.clone(),
node: node,
whence: item.span,
});
}
hir::ItemMod(ref m) => {
om.mods.push(self.visit_mod_contents(item.span,
item.attrs.clone(),
item.vis,
item.id,
m,
Some(name)));
},
hir::ItemEnum(ref ed, ref gen) =>
om.enums.push(self.visit_enum_def(item, name, ed, gen)),
hir::ItemStruct(ref sd, ref gen) =>
om.structs.push(self.visit_variant_data(item, name, sd, gen)),
hir::ItemFn(ref fd, ref unsafety, constness, ref abi, ref gen, _) =>
om.fns.push(self.visit_fn(item, name, &**fd, unsafety,
constness, abi, gen)),
hir::ItemTy(ref ty, ref gen) => {
let t = Typedef {
ty: ty.clone(),
gen: gen.clone(),
name: name,
id: item.id,
attrs: item.attrs.clone(),
whence: item.span,
vis: item.vis,
stab: self.stability(item.id),
depr: self.deprecation(item.id),
};
om.typedefs.push(t);
},
hir::ItemStatic(ref ty, ref mut_, ref exp) => {
let s = Static {
type_: ty.clone(),
mutability: mut_.clone(),
expr: exp.clone(),
id: item.id,
name: name,
attrs: item.attrs.clone(),
whence: item.span,
vis: item.vis,
stab: self.stability(item.id),
depr: self.deprecation(item.id),
};
om.statics.push(s);
},
hir::ItemConst(ref ty, ref exp) => {
let s = Constant {
type_: ty.clone(),
expr: exp.clone(),
id: item.id,
name: name,
attrs: item.attrs.clone(),
whence: item.span,
vis: item.vis,
stab: self.stability(item.id),
depr: self.deprecation(item.id),
};
om.constants.push(s);
},
hir::ItemTrait(unsafety, ref gen, ref b, ref items) => {
let t = Trait {
unsafety: unsafety,
name: name,
items: items.clone(),
generics: gen.clone(),
bounds: b.iter().cloned().collect(),
id: item.id,
attrs: item.attrs.clone(),
whence: item.span,
vis: item.vis,
stab: self.stability(item.id),
depr: self.deprecation(item.id),
};
om.traits.push(t);
},
hir::ItemImpl(unsafety, polarity, ref gen, ref tr, ref ty, ref items) => {
let i = Impl {
unsafety: unsafety,
polarity: polarity,
generics: gen.clone(),
trait_: tr.clone(),
for_: ty.clone(),
items: items.clone(),
attrs: item.attrs.clone(),
id: item.id,
whence: item.span,
vis: item.vis,
stab: self.stability(item.id),
depr: self.deprecation(item.id),
};
// Don't duplicate impls when inlining glob imports, we'll pick
// them up regardless of where they're located.
if !self.inlining_from_glob {
om.impls.push(i);
}
},
hir::ItemDefaultImpl(unsafety, ref trait_ref) => {
let i = DefaultImpl {
unsafety: unsafety,
trait_: trait_ref.clone(),
id: item.id,
attrs: item.attrs.clone(),
whence: item.span,
};
// see comment above about ItemImpl
if !self.inlining_from_glob {
om.def_traits.push(i);
}
}
hir::ItemForeignMod(ref fm) => {
om.foreigns.push(fm.clone());
}
}
}
// convert each exported_macro into a doc item
fn visit_macro(&self, def: &hir::MacroDef) -> Macro {
// Extract the spans of all matchers. They represent the "interface" of the macro.
let matchers = def.body.chunks(4).map(|arm| arm[0].get_span()).collect();
Macro {
id: def.id,
attrs: def.attrs.clone(),
name: def.name,
whence: def.span,
matchers: matchers,
stab: self.stability(def.id),
depr: self.deprecation(def.id),
imported_from: def.imported_from,
}
}
}