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Rollup merge of #83835 - notriddle:sort-index, r=ollie27

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rustdoc: sort search index items for compression

This should not affect the appearance of the docs pages themselves.

This makes the pre-compressed search index smaller, thanks to the
empty-string path duplication format, and also the gzipped version,
by giving the algorithm more structure to work with.

    rust$ wc -c search-index-old.js search-index-new.js
    2628334 search-index-old.js
    2586181 search-index-new.js
    5214515 total
    rust$ gzip search-index-*
    rust$ wc -c search-index-old.js.gz search-index-new.js.gz
    239486 search-index-old.js.gz
    237386 search-index-new.js.gz
    476872 total
This commit is contained in:
Yuki Okushi 2021-04-06 06:24:13 +09:00 • committed by GitHub
commit 12d007da0f
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4 changed files with 26 additions and 23 deletions
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13
src/librustdoc/formats/cache.rs
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@ -120,10 +120,6 @@ crate struct Cache {
// when gathering trait documentation on a type, hold impls here while
// folding and add them to the cache later on if we find the trait.
orphan_trait_impls: Vec<(DefId, FxHashSet<DefId>, Impl)>,
/// Aliases added through `#[doc(alias = "...")]`. Since a few items can have the same alias,
/// we need the alias element to have an array of items.
crate aliases: BTreeMap<String, Vec<usize>>,
}
/// This struct is used to wrap the `cache` and `tcx` in order to run `DocFolder`.
@ -309,15 +305,8 @@ impl<'a, 'tcx> DocFolder for CacheBuilder<'a, 'tcx> {
parent,
parent_idx: None,
search_type: get_index_search_type(&item, &self.empty_cache, self.tcx),
aliases: item.attrs.get_doc_aliases(),
});
for alias in item.attrs.get_doc_aliases() {
self.cache
.aliases
.entry(alias.to_lowercase())
.or_insert(Vec::new())
.push(self.cache.search_index.len() - 1);
}
}
}
(Some(parent), None) if is_inherent_impl_item => {