1 // Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
20 pub fn fold(self) -> Option<Item> {
22 FoldItem::Erase => None,
23 FoldItem::Retain(i) => Some(i),
24 FoldItem::Strip(item@ Item { inner: StrippedItem(..), .. } ) => Some(item),
25 FoldItem::Strip(mut i) => {
26 i.inner = StrippedItem(box i.inner);
33 pub trait DocFolder : Sized {
34 fn fold_item(&mut self, item: Item) -> Option<Item> {
35 self.fold_item_recur(item)
39 fn fold_inner_recur(&mut self, inner: ItemEnum) -> ItemEnum {
41 StrippedItem(..) => unreachable!(),
43 ModuleItem(self.fold_mod(i))
45 StructItem(mut i) => {
46 let num_fields = i.fields.len();
47 i.fields = i.fields.into_iter().filter_map(|x| self.fold_item(x)).collect();
48 i.fields_stripped |= num_fields != i.fields.len() ||
49 i.fields.iter().any(|f| f.is_stripped());
53 let num_fields = i.fields.len();
54 i.fields = i.fields.into_iter().filter_map(|x| self.fold_item(x)).collect();
55 i.fields_stripped |= num_fields != i.fields.len() ||
56 i.fields.iter().any(|f| f.is_stripped());
60 let num_variants = i.variants.len();
61 i.variants = i.variants.into_iter().filter_map(|x| self.fold_item(x)).collect();
62 i.variants_stripped |= num_variants != i.variants.len() ||
63 i.variants.iter().any(|f| f.is_stripped());
67 i.items = i.items.into_iter().filter_map(|x| self.fold_item(x)).collect();
71 i.items = i.items.into_iter().filter_map(|x| self.fold_item(x)).collect();
75 let i2 = i.clone(); // this clone is small
77 VariantKind::Struct(mut j) => {
78 let num_fields = j.fields.len();
79 j.fields = j.fields.into_iter().filter_map(|x| self.fold_item(x)).collect();
80 j.fields_stripped |= num_fields != j.fields.len() ||
81 j.fields.iter().any(|f| f.is_stripped());
82 VariantItem(Variant {kind: VariantKind::Struct(j), ..i2})
92 fn fold_item_recur(&mut self, item: Item) -> Option<Item> {
93 let Item { attrs, name, source, visibility, def_id, inner, stability, deprecation } = item;
95 let inner = match inner {
96 StrippedItem(box i) => StrippedItem(box self.fold_inner_recur(i)),
97 _ => self.fold_inner_recur(inner),
100 Some(Item { attrs, name, source, inner, visibility,
101 stability, deprecation, def_id })
104 fn fold_mod(&mut self, m: Module) -> Module {
106 is_crate: m.is_crate,
107 items: m.items.into_iter().filter_map(|i| self.fold_item(i)).collect()
111 fn fold_crate(&mut self, mut c: Crate) -> Crate {
112 c.module = c.module.and_then(|module| self.fold_item(module));
114 c.external_traits = c.external_traits.into_iter().map(|(k, mut v)| {
115 v.items = v.items.into_iter().filter_map(|i| self.fold_item(i)).collect();