509 lines
19 KiB
Rust
509 lines
19 KiB
Rust
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Rust AST Visitor. Extracts useful information and massages it into a form
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//! usable for clean
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use std::mem;
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use syntax::abi;
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use syntax::ast;
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use syntax::attr;
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use syntax_pos::Span;
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use rustc::hir::map as hir_map;
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use rustc::hir::def::Def;
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use rustc::middle::privacy::AccessLevel;
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use rustc::util::nodemap::FnvHashSet;
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use rustc::hir;
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use core;
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use clean::{self, Clean, Attributes};
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use doctree::*;
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// looks to me like the first two of these are actually
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// output parameters, maybe only mutated once; perhaps
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// better simply to have the visit method return a tuple
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// containing them?
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// also, is there some reason that this doesn't use the 'visit'
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// framework from syntax?
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pub struct RustdocVisitor<'a, 'tcx: 'a> {
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pub module: Module,
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pub attrs: hir::HirVec<ast::Attribute>,
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pub cx: &'a core::DocContext<'a, 'tcx>,
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view_item_stack: FnvHashSet<ast::NodeId>,
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inlining_from_glob: bool,
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}
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impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
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pub fn new(cx: &'a core::DocContext<'a, 'tcx>) -> RustdocVisitor<'a, 'tcx> {
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// If the root is reexported, terminate all recursion.
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let mut stack = FnvHashSet();
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stack.insert(ast::CRATE_NODE_ID);
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RustdocVisitor {
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module: Module::new(None),
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attrs: hir::HirVec::new(),
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cx: cx,
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view_item_stack: stack,
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inlining_from_glob: false,
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}
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}
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fn stability(&self, id: ast::NodeId) -> Option<attr::Stability> {
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self.cx.tcx_opt().and_then(|tcx| {
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self.cx.map.opt_local_def_id(id)
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.and_then(|def_id| tcx.lookup_stability(def_id))
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.cloned()
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})
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}
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fn deprecation(&self, id: ast::NodeId) -> Option<attr::Deprecation> {
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self.cx.tcx_opt().and_then(|tcx| {
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self.cx.map.opt_local_def_id(id)
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.and_then(|def_id| tcx.lookup_deprecation(def_id))
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})
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}
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pub fn visit(&mut self, krate: &hir::Crate) {
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self.attrs = krate.attrs.clone();
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self.module = self.visit_mod_contents(krate.span,
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krate.attrs.clone(),
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hir::Public,
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ast::CRATE_NODE_ID,
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&krate.module,
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None);
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// attach the crate's exported macros to the top-level module:
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self.module.macros = krate.exported_macros.iter()
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.map(|def| self.visit_macro(def)).collect();
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self.module.is_crate = true;
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}
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pub fn visit_variant_data(&mut self, item: &hir::Item,
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name: ast::Name, sd: &hir::VariantData,
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generics: &hir::Generics) -> Struct {
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debug!("Visiting struct");
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let struct_type = struct_type_from_def(&*sd);
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Struct {
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id: item.id,
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struct_type: struct_type,
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name: name,
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vis: item.vis.clone(),
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stab: self.stability(item.id),
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depr: self.deprecation(item.id),
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attrs: item.attrs.clone(),
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generics: generics.clone(),
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fields: sd.fields().iter().cloned().collect(),
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whence: item.span
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}
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}
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pub fn visit_union_data(&mut self, item: &hir::Item,
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name: ast::Name, sd: &hir::VariantData,
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generics: &hir::Generics) -> Union {
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debug!("Visiting union");
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let struct_type = struct_type_from_def(&*sd);
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Union {
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id: item.id,
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struct_type: struct_type,
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name: name,
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vis: item.vis.clone(),
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stab: self.stability(item.id),
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depr: self.deprecation(item.id),
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attrs: item.attrs.clone(),
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generics: generics.clone(),
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fields: sd.fields().iter().cloned().collect(),
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whence: item.span
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}
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}
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pub fn visit_enum_def(&mut self, it: &hir::Item,
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name: ast::Name, def: &hir::EnumDef,
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params: &hir::Generics) -> Enum {
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debug!("Visiting enum");
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Enum {
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name: name,
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variants: def.variants.iter().map(|v| Variant {
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name: v.node.name,
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attrs: v.node.attrs.clone(),
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stab: self.stability(v.node.data.id()),
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depr: self.deprecation(v.node.data.id()),
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def: v.node.data.clone(),
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whence: v.span,
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}).collect(),
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vis: it.vis.clone(),
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stab: self.stability(it.id),
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depr: self.deprecation(it.id),
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generics: params.clone(),
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attrs: it.attrs.clone(),
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id: it.id,
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whence: it.span,
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}
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}
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pub fn visit_fn(&mut self, item: &hir::Item,
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name: ast::Name, fd: &hir::FnDecl,
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unsafety: &hir::Unsafety,
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constness: hir::Constness,
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abi: &abi::Abi,
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gen: &hir::Generics) -> Function {
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debug!("Visiting fn");
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Function {
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id: item.id,
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vis: item.vis.clone(),
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stab: self.stability(item.id),
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depr: self.deprecation(item.id),
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attrs: item.attrs.clone(),
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decl: fd.clone(),
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name: name,
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whence: item.span,
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generics: gen.clone(),
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unsafety: *unsafety,
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constness: constness,
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abi: *abi,
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}
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}
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pub fn visit_mod_contents(&mut self, span: Span, attrs: hir::HirVec<ast::Attribute>,
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vis: hir::Visibility, id: ast::NodeId,
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m: &hir::Mod,
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name: Option<ast::Name>) -> Module {
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let mut om = Module::new(name);
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om.where_outer = span;
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om.where_inner = m.inner;
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om.attrs = attrs;
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om.vis = vis.clone();
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om.stab = self.stability(id);
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om.depr = self.deprecation(id);
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om.id = id;
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for i in &m.item_ids {
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let item = self.cx.map.expect_item(i.id);
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self.visit_item(item, None, &mut om);
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}
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om
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}
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fn visit_view_path(&mut self, path: hir::ViewPath_,
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om: &mut Module,
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id: ast::NodeId,
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please_inline: bool) -> Option<hir::ViewPath_> {
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match path {
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hir::ViewPathSimple(dst, base) => {
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if self.maybe_inline_local(id, Some(dst), false, om, please_inline) {
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None
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} else {
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Some(hir::ViewPathSimple(dst, base))
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}
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}
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hir::ViewPathList(p, paths) => {
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let mine = paths.into_iter().filter(|path| {
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!self.maybe_inline_local(path.node.id, path.node.rename,
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false, om, please_inline)
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}).collect::<hir::HirVec<hir::PathListItem>>();
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if mine.is_empty() {
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None
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} else {
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Some(hir::ViewPathList(p, mine))
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}
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}
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hir::ViewPathGlob(base) => {
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if self.maybe_inline_local(id, None, true, om, please_inline) {
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None
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} else {
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Some(hir::ViewPathGlob(base))
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}
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}
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}
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}
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/// Tries to resolve the target of a `pub use` statement and inlines the
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/// target if it is defined locally and would not be documented otherwise,
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/// or when it is specifically requested with `please_inline`.
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/// (the latter is the case when the import is marked `doc(inline)`)
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///
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/// Cross-crate inlining occurs later on during crate cleaning
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/// and follows different rules.
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///
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/// Returns true if the target has been inlined.
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fn maybe_inline_local(&mut self, id: ast::NodeId, renamed: Option<ast::Name>,
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glob: bool, om: &mut Module, please_inline: bool) -> bool {
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fn inherits_doc_hidden(cx: &core::DocContext, mut node: ast::NodeId) -> bool {
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while let Some(id) = cx.map.get_enclosing_scope(node) {
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node = id;
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let attrs = cx.map.attrs(node).clean(cx);
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if attrs.list("doc").has_word("hidden") {
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return true;
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}
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if node == ast::CRATE_NODE_ID {
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break;
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}
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}
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false
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}
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let tcx = match self.cx.tcx_opt() {
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Some(tcx) => tcx,
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None => return false
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};
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let def = tcx.expect_def(id);
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let def_did = def.def_id();
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let use_attrs = tcx.map.attrs(id).clean(self.cx);
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// Don't inline doc(hidden) imports so they can be stripped at a later stage.
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let is_no_inline = use_attrs.list("doc").has_word("no_inline") ||
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use_attrs.list("doc").has_word("hidden");
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// For cross-crate impl inlining we need to know whether items are
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// reachable in documentation - a previously nonreachable item can be
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// made reachable by cross-crate inlining which we're checking here.
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// (this is done here because we need to know this upfront)
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if !def_did.is_local() && !is_no_inline {
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let attrs = clean::inline::load_attrs(self.cx, tcx, def_did);
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let self_is_hidden = attrs.list("doc").has_word("hidden");
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match def {
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Def::Trait(did) |
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Def::Struct(did) |
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Def::Union(did) |
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Def::Enum(did) |
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Def::TyAlias(did) if !self_is_hidden => {
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self.cx.access_levels.borrow_mut().map.insert(did, AccessLevel::Public);
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},
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Def::Mod(did) => if !self_is_hidden {
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::visit_lib::LibEmbargoVisitor::new(self.cx).visit_mod(did);
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},
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_ => {},
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}
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return false
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}
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let def_node_id = match tcx.map.as_local_node_id(def_did) {
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Some(n) => n, None => return false
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};
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let is_private = !self.cx.access_levels.borrow().is_public(def_did);
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let is_hidden = inherits_doc_hidden(self.cx, def_node_id);
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// Only inline if requested or if the item would otherwise be stripped
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if (!please_inline && !is_private && !is_hidden) || is_no_inline {
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return false
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}
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if !self.view_item_stack.insert(def_node_id) { return false }
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let ret = match tcx.map.get(def_node_id) {
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hir_map::NodeItem(it) => {
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if glob {
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let prev = mem::replace(&mut self.inlining_from_glob, true);
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match it.node {
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hir::ItemMod(ref m) => {
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for i in &m.item_ids {
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let i = self.cx.map.expect_item(i.id);
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self.visit_item(i, None, om);
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}
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}
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hir::ItemEnum(..) => {}
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_ => { panic!("glob not mapped to a module or enum"); }
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}
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self.inlining_from_glob = prev;
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} else {
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self.visit_item(it, renamed, om);
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}
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true
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}
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_ => false,
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};
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self.view_item_stack.remove(&def_node_id);
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return ret;
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}
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pub fn visit_item(&mut self, item: &hir::Item,
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renamed: Option<ast::Name>, om: &mut Module) {
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debug!("Visiting item {:?}", item);
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let name = renamed.unwrap_or(item.name);
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match item.node {
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hir::ItemExternCrate(ref p) => {
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let cstore = &self.cx.sess().cstore;
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om.extern_crates.push(ExternCrate {
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cnum: cstore.extern_mod_stmt_cnum(item.id)
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.unwrap_or(ast::CrateNum::max_value()),
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name: name,
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path: p.map(|x|x.to_string()),
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vis: item.vis.clone(),
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attrs: item.attrs.clone(),
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whence: item.span,
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})
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}
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hir::ItemUse(ref vpath) => {
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let node = vpath.node.clone();
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let node = if item.vis == hir::Public {
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let please_inline = item.attrs.iter().any(|item| {
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match item.meta_item_list() {
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Some(list) if item.check_name("doc") => {
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list.iter().any(|i| i.check_name("inline"))
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}
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_ => false,
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}
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});
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match self.visit_view_path(node, om, item.id, please_inline) {
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None => return,
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Some(p) => p
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}
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} else {
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node
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};
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om.imports.push(Import {
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id: item.id,
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vis: item.vis.clone(),
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attrs: item.attrs.clone(),
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node: node,
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whence: item.span,
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});
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}
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hir::ItemMod(ref m) => {
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om.mods.push(self.visit_mod_contents(item.span,
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item.attrs.clone(),
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item.vis.clone(),
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item.id,
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m,
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Some(name)));
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},
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hir::ItemEnum(ref ed, ref gen) =>
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om.enums.push(self.visit_enum_def(item, name, ed, gen)),
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hir::ItemStruct(ref sd, ref gen) =>
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om.structs.push(self.visit_variant_data(item, name, sd, gen)),
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hir::ItemUnion(ref sd, ref gen) =>
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om.unions.push(self.visit_union_data(item, name, sd, gen)),
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hir::ItemFn(ref fd, ref unsafety, constness, ref abi, ref gen, _) =>
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om.fns.push(self.visit_fn(item, name, &**fd, unsafety,
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constness, abi, gen)),
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hir::ItemTy(ref ty, ref gen) => {
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let t = Typedef {
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ty: ty.clone(),
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gen: gen.clone(),
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name: name,
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id: item.id,
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attrs: item.attrs.clone(),
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whence: item.span,
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vis: item.vis.clone(),
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stab: self.stability(item.id),
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depr: self.deprecation(item.id),
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};
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om.typedefs.push(t);
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},
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hir::ItemStatic(ref ty, ref mut_, ref exp) => {
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let s = Static {
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type_: ty.clone(),
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mutability: mut_.clone(),
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expr: exp.clone(),
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id: item.id,
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name: name,
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attrs: item.attrs.clone(),
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whence: item.span,
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vis: item.vis.clone(),
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stab: self.stability(item.id),
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depr: self.deprecation(item.id),
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};
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om.statics.push(s);
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},
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hir::ItemConst(ref ty, ref exp) => {
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let s = Constant {
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type_: ty.clone(),
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expr: exp.clone(),
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id: item.id,
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name: name,
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attrs: item.attrs.clone(),
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whence: item.span,
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vis: item.vis.clone(),
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stab: self.stability(item.id),
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depr: self.deprecation(item.id),
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};
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om.constants.push(s);
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},
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hir::ItemTrait(unsafety, ref gen, ref b, ref items) => {
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let t = Trait {
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unsafety: unsafety,
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name: name,
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items: items.clone(),
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generics: gen.clone(),
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bounds: b.iter().cloned().collect(),
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id: item.id,
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attrs: item.attrs.clone(),
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whence: item.span,
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vis: item.vis.clone(),
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stab: self.stability(item.id),
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depr: self.deprecation(item.id),
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};
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om.traits.push(t);
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},
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hir::ItemImpl(unsafety, polarity, ref gen, ref tr, ref ty, ref items) => {
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let i = Impl {
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unsafety: unsafety,
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polarity: polarity,
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generics: gen.clone(),
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trait_: tr.clone(),
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for_: ty.clone(),
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items: items.clone(),
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attrs: item.attrs.clone(),
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id: item.id,
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whence: item.span,
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vis: item.vis.clone(),
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stab: self.stability(item.id),
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depr: self.deprecation(item.id),
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};
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// Don't duplicate impls when inlining glob imports, we'll pick
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// them up regardless of where they're located.
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if !self.inlining_from_glob {
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om.impls.push(i);
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}
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},
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hir::ItemDefaultImpl(unsafety, ref trait_ref) => {
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let i = DefaultImpl {
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unsafety: unsafety,
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trait_: trait_ref.clone(),
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id: item.id,
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attrs: item.attrs.clone(),
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whence: item.span,
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};
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// see comment above about ItemImpl
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if !self.inlining_from_glob {
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om.def_traits.push(i);
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}
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}
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hir::ItemForeignMod(ref fm) => {
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om.foreigns.push(fm.clone());
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}
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}
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}
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// convert each exported_macro into a doc item
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fn visit_macro(&self, def: &hir::MacroDef) -> Macro {
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// Extract the spans of all matchers. They represent the "interface" of the macro.
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let matchers = def.body.chunks(4).map(|arm| arm[0].get_span()).collect();
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Macro {
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id: def.id,
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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,
|
|
}
|
|
}
|
|
}
|