src/librustdoc/fold.rs

   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.
   4 //
   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.
  10
  11 use clean::*;
  12 use std::collections::HashMap;
  13 use std::mem::{replace, swap};
  14
  15 pub trait DocFolder : Sized {
  16     fn fold_item(&mut self, item: Item) -> Option<Item> {
  17         self.fold_item_recur(item)
  18     }
  19
  20     /// don't override!
  21     fn fold_item_recur(&mut self, item: Item) -> Option<Item> {
  22         let Item { attrs, name, source, visibility, def_id, inner, stability, deprecation } = item;
  23         let inner = inner;
  24         let inner = match inner {
  25             StructItem(mut i) => {
  26                 let mut foo = Vec::new(); swap(&mut foo, &mut i.fields);
  27                 let num_fields = foo.len();
  28                 i.fields.extend(foo.into_iter().filter_map(|x| self.fold_item(x)));
  29                 i.fields_stripped |= num_fields != i.fields.len();
  30                 StructItem(i)
  31             },
  32             ModuleItem(i) => {
  33                 ModuleItem(self.fold_mod(i))
  34             },
  35             EnumItem(mut i) => {
  36                 let mut foo = Vec::new(); swap(&mut foo, &mut i.variants);
  37                 let num_variants = foo.len();
  38                 i.variants.extend(foo.into_iter().filter_map(|x| self.fold_item(x)));
  39                 i.variants_stripped |= num_variants != i.variants.len();
  40                 EnumItem(i)
  41             },
  42             TraitItem(mut i) => {
  43                 let mut foo = Vec::new(); swap(&mut foo, &mut i.items);
  44                 i.items.extend(foo.into_iter().filter_map(|x| self.fold_item(x)));
  45                 TraitItem(i)
  46             },
  47             ImplItem(mut i) => {
  48                 let mut foo = Vec::new(); swap(&mut foo, &mut i.items);
  49                 i.items.extend(foo.into_iter().filter_map(|x| self.fold_item(x)));
  50                 ImplItem(i)
  51             },
  52             VariantItem(i) => {
  53                 let i2 = i.clone(); // this clone is small
  54                 match i.kind {
  55                     StructVariant(mut j) => {
  56                         let mut foo = Vec::new(); swap(&mut foo, &mut j.fields);
  57                         let num_fields = foo.len();
  58                         j.fields.extend(foo.into_iter().filter_map(|x| self.fold_item(x)));
  59                         j.fields_stripped |= num_fields != j.fields.len();
  60                         VariantItem(Variant {kind: StructVariant(j), ..i2})
  61                     },
  62                     _ => VariantItem(i2)
  63                 }
  64             },
  65             x => x
  66         };
  67
  68         Some(Item { attrs: attrs, name: name, source: source, inner: inner,
  69                     visibility: visibility, stability: stability, deprecation: deprecation,
  70                     def_id: def_id })
  71     }
  72
  73     fn fold_mod(&mut self, m: Module) -> Module {
  74         Module {
  75             is_crate: m.is_crate,
  76             items: m.items.into_iter().filter_map(|i| self.fold_item(i)).collect()
  77         }
  78     }
  79
  80     fn fold_crate(&mut self, mut c: Crate) -> Crate {
  81         c.module = match replace(&mut c.module, None) {
  82             Some(module) => self.fold_item(module), None => None
  83         };
  84         let external_traits = replace(&mut c.external_traits, HashMap::new());
  85         c.external_traits = external_traits.into_iter().map(|(k, mut v)| {
  86             let items = replace(&mut v.items, Vec::new());
  87             v.items = items.into_iter().filter_map(|i| self.fold_item(i))
  88                            .collect();
  89             (k, v)
  90         }).collect();
  91         return c;
  92     }
  93 }