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Rollup merge of #83003 - notriddle:rustdoc-index-v3, r=GuillaumeGomez
rustdoc: tweak the search index format This essentially switches search-index.js from a "array of struct" to a "struct of array" format, like this: { "doc": "Crate documentation", "t": [ 1, 1, 2, 3, ... ], "n": [ "Something", "SomethingElse", "whatever", "do_stuff", ... ], "q": [ "a::b", "", "", "", ... ], "d": [ "A Struct That Does Something", "Another Struct", "a function", "another function", ... ], "i": [ 0, 0, 1, 1, ... ], "f": [ null, null, [], [], ... ], "p": ..., "a": ... } So `{ty: 1, name: "Something", path: "a::b", desc: "A Struct That Does Something", parent_idx: 0, search_type: null}` is the first item. This makes the uncompressed version smaller, but it really shows on the compressed version: notriddle:rust$ wc -c new-search-index1.52.0.js 2622427 new-search-index1.52.0.js notriddle:rust$ wc -c old-search-index1.52.0.js 2725046 old-search-index1.52.0.js notriddle:rust$ gzip new-search-index1.52.0.js notriddle:rust$ gzip old-search-index1.52.0.js notriddle:rust$ wc -c new-search-index1.52.0.js.gz 239385 new-search-index1.52.0.js.gz notriddle:rust$ wc -c old-search-index1.52.0.js.gz 296328 old-search-index1.52.0.js.gz That's a 4% improvement on the uncompressed version (fewer `[]`, and also changing `null` to `0` in the parent_idx list), and 20% improvement after gzipping it, thanks to putting like-typed data next to each other. Any compression algorithm based on a sliding window will probably show this kind of improvement.
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