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use super::*;
use hir::intravisit::{Visitor, NestedVisitorMap};
use std::iter::repeat;
use syntax::ast::{NodeId, CRATE_NODE_ID};
use syntax_pos::Span;
pub struct NodeCollector<'hir> {
pub krate: &'hir Crate,
pub(super) map: Vec<MapEntry<'hir>>,
pub parent_node: NodeId,
}
impl<'hir> NodeCollector<'hir> {
pub fn root(krate: &'hir Crate) -> NodeCollector<'hir> {
let mut collector = NodeCollector {
krate: krate,
map: vec![],
parent_node: CRATE_NODE_ID,
};
collector.insert_entry(CRATE_NODE_ID, RootCrate);
collector
}
fn insert_entry(&mut self, id: NodeId, entry: MapEntry<'hir>) {
debug!("hir_map: {:?} => {:?}", id, entry);
let len = self.map.len();
if id.as_usize() >= len {
self.map.extend(repeat(NotPresent).take(id.as_usize() - len + 1));
}
self.map[id.as_usize()] = entry;
}
fn insert(&mut self, id: NodeId, node: Node<'hir>) {
let entry = MapEntry::from_node(self.parent_node, node);
self.insert_entry(id, entry);
}
fn with_parent<F: FnOnce(&mut Self)>(&mut self, parent_id: NodeId, f: F) {
let parent_node = self.parent_node;
self.parent_node = parent_id;
f(self);
self.parent_node = parent_node;
}
}
impl<'hir> Visitor<'hir> for NodeCollector<'hir> {
fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'hir> {
panic!("visit_nested_xxx must be manually implemented in this visitor")
}
fn visit_nested_item(&mut self, item: ItemId) {
debug!("visit_nested_item: {:?}", item);
self.visit_item(self.krate.item(item.id));
}
fn visit_nested_trait_item(&mut self, item_id: TraitItemId) {
self.visit_trait_item(self.krate.trait_item(item_id));
}
fn visit_nested_impl_item(&mut self, item_id: ImplItemId) {
self.visit_impl_item(self.krate.impl_item(item_id));
}
fn visit_nested_body(&mut self, id: BodyId) {
self.visit_body(self.krate.body(id));
}
fn visit_item(&mut self, i: &'hir Item) {
debug!("visit_item: {:?}", i);
self.insert(i.id, NodeItem(i));
self.with_parent(i.id, |this| {
match i.node {
ItemStruct(ref struct_def, _) => {
if !struct_def.is_struct() {
this.insert(struct_def.id(), NodeStructCtor(struct_def));
}
}
_ => {}
}
intravisit::walk_item(this, i);
});
}
fn visit_foreign_item(&mut self, foreign_item: &'hir ForeignItem) {
self.insert(foreign_item.id, NodeForeignItem(foreign_item));
self.with_parent(foreign_item.id, |this| {
intravisit::walk_foreign_item(this, foreign_item);
});
}
fn visit_generics(&mut self, generics: &'hir Generics) {
for ty_param in generics.ty_params.iter() {
self.insert(ty_param.id, NodeTyParam(ty_param));
}
intravisit::walk_generics(self, generics);
}
fn visit_trait_item(&mut self, ti: &'hir TraitItem) {
self.insert(ti.id, NodeTraitItem(ti));
self.with_parent(ti.id, |this| {
intravisit::walk_trait_item(this, ti);
});
}
fn visit_impl_item(&mut self, ii: &'hir ImplItem) {
self.insert(ii.id, NodeImplItem(ii));
self.with_parent(ii.id, |this| {
intravisit::walk_impl_item(this, ii);
});
}
fn visit_pat(&mut self, pat: &'hir Pat) {
let node = if let PatKind::Binding(..) = pat.node {
NodeLocal(pat)
} else {
NodePat(pat)
};
self.insert(pat.id, node);
self.with_parent(pat.id, |this| {
intravisit::walk_pat(this, pat);
});
}
fn visit_expr(&mut self, expr: &'hir Expr) {
self.insert(expr.id, NodeExpr(expr));
self.with_parent(expr.id, |this| {
intravisit::walk_expr(this, expr);
});
}
fn visit_stmt(&mut self, stmt: &'hir Stmt) {
let id = stmt.node.id();
self.insert(id, NodeStmt(stmt));
self.with_parent(id, |this| {
intravisit::walk_stmt(this, stmt);
});
}
fn visit_ty(&mut self, ty: &'hir Ty) {
self.insert(ty.id, NodeTy(ty));
self.with_parent(ty.id, |this| {
intravisit::walk_ty(this, ty);
});
}
fn visit_trait_ref(&mut self, tr: &'hir TraitRef) {
self.insert(tr.ref_id, NodeTraitRef(tr));
self.with_parent(tr.ref_id, |this| {
intravisit::walk_trait_ref(this, tr);
});
}
fn visit_fn(&mut self, fk: intravisit::FnKind<'hir>, fd: &'hir FnDecl,
b: BodyId, s: Span, id: NodeId) {
assert_eq!(self.parent_node, id);
intravisit::walk_fn(self, fk, fd, b, s, id);
}
fn visit_block(&mut self, block: &'hir Block) {
self.insert(block.id, NodeBlock(block));
self.with_parent(block.id, |this| {
intravisit::walk_block(this, block);
});
}
fn visit_lifetime(&mut self, lifetime: &'hir Lifetime) {
self.insert(lifetime.id, NodeLifetime(lifetime));
}
fn visit_vis(&mut self, visibility: &'hir Visibility) {
match *visibility {
Visibility::Public |
Visibility::Crate |
Visibility::Inherited => {}
Visibility::Restricted { id, .. } => {
self.insert(id, NodeVisibility(visibility));
self.with_parent(id, |this| {
intravisit::walk_vis(this, visibility);
});
}
}
}
fn visit_macro_def(&mut self, macro_def: &'hir MacroDef) {
self.insert_entry(macro_def.id, NotPresent);
}
fn visit_variant(&mut self, v: &'hir Variant, g: &'hir Generics, item_id: NodeId) {
let id = v.node.data.id();
self.insert(id, NodeVariant(v));
self.with_parent(id, |this| {
intravisit::walk_variant(this, v, g, item_id);
});
}
fn visit_struct_field(&mut self, field: &'hir StructField) {
self.insert(field.id, NodeField(field));
self.with_parent(field.id, |this| {
intravisit::walk_struct_field(this, field);
});
}
}