| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/tantivy-fst-0.4.0/src/raw/registry.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>registry.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../tantivy_fst/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../tantivy_fst/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::raw::build::BuilderNode; |
| <span class="kw">use </span><span class="kw">crate</span>::raw::{CompiledAddr, NONE_ADDRESS}; |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Registry { |
| table: Vec<RegistryCell>, |
| table_size: usize, <span class="comment">// number of rows |
| </span>mru_size: usize, <span class="comment">// number of columns |
| </span>} |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>RegistryCache<<span class="lifetime">'a</span>> { |
| cells: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>[RegistryCell], |
| } |
| |
| <span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>RegistryCell { |
| addr: CompiledAddr, |
| node: BuilderNode, |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub enum </span>RegistryEntry<<span class="lifetime">'a</span>> { |
| Found(CompiledAddr), |
| NotFound(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>RegistryCell), |
| Rejected, |
| } |
| |
| <span class="kw">impl </span>Registry { |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>new(table_size: usize, mru_size: usize) -> Registry { |
| <span class="kw">let </span>empty_cell = RegistryCell::none(); |
| <span class="kw">let </span>ncells = table_size.checked_mul(mru_size).unwrap(); |
| Registry { |
| table: <span class="macro">vec!</span>[empty_cell; ncells], |
| table_size, |
| mru_size, |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>entry(<span class="kw-2">&mut </span><span class="self">self</span>, node: <span class="kw-2">&</span>BuilderNode) -> RegistryEntry { |
| <span class="kw">if </span><span class="self">self</span>.table.is_empty() { |
| <span class="kw">return </span>RegistryEntry::Rejected; |
| } |
| <span class="kw">let </span>bucket = <span class="self">self</span>.hash(node); |
| <span class="kw">let </span>start = <span class="self">self</span>.mru_size * bucket; |
| <span class="kw">let </span>end = start + <span class="self">self</span>.mru_size; |
| RegistryCache { |
| cells: <span class="kw-2">&mut </span><span class="self">self</span>.table[start..end], |
| } |
| .entry(node) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>hash(<span class="kw-2">&</span><span class="self">self</span>, node: <span class="kw-2">&</span>BuilderNode) -> usize { |
| <span class="comment">// Basic FNV-1a hash as described: |
| // https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function |
| // |
| // In unscientific experiments, this provides the same compression |
| // as `std::hash::SipHasher` but is much much faster. |
| </span><span class="kw">const </span>FNV_PRIME: u64 = <span class="number">1_099_511_628_211</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>h = <span class="number">14_695_981_039_346_656_037</span>; |
| h = (h ^ (node.is_final <span class="kw">as </span>u64)).wrapping_mul(FNV_PRIME); |
| h = (h ^ node.final_output.value()).wrapping_mul(FNV_PRIME); |
| <span class="kw">for </span>t <span class="kw">in </span><span class="kw-2">&</span>node.trans { |
| h = (h ^ (t.inp <span class="kw">as </span>u64)).wrapping_mul(FNV_PRIME); |
| h = (h ^ t.out.value()).wrapping_mul(FNV_PRIME); |
| h = (h ^ (t.addr <span class="kw">as </span>u64)).wrapping_mul(FNV_PRIME); |
| } |
| (h <span class="kw">as </span>usize) % <span class="self">self</span>.table_size |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> RegistryCache<<span class="lifetime">'a</span>> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>entry(<span class="kw-2">mut </span><span class="self">self</span>, node: <span class="kw-2">&</span>BuilderNode) -> RegistryEntry<<span class="lifetime">'a</span>> { |
| <span class="kw">if </span><span class="self">self</span>.cells.len() == <span class="number">1 </span>{ |
| <span class="kw">let </span>cell = <span class="kw-2">&mut </span><span class="self">self</span>.cells[<span class="number">0</span>]; |
| <span class="kw">if </span>!cell.is_none() && <span class="kw-2">&</span>cell.node == node { |
| RegistryEntry::Found(cell.addr) |
| } <span class="kw">else </span>{ |
| cell.node.clone_from(node); |
| RegistryEntry::NotFound(cell) |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>find = |c: <span class="kw-2">&</span>RegistryCell| !c.is_none() && <span class="kw-2">&</span>c.node == node; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(i) = <span class="self">self</span>.cells.iter().position(find) { |
| <span class="kw">let </span>addr = <span class="self">self</span>.cells[i].addr; |
| <span class="self">self</span>.promote(i); <span class="comment">// most recently used |
| </span>RegistryEntry::Found(addr) |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>last = <span class="self">self</span>.cells.len() - <span class="number">1</span>; |
| <span class="self">self</span>.cells[last].node.clone_from(node); <span class="comment">// discard LRU |
| </span><span class="self">self</span>.promote(last); |
| RegistryEntry::NotFound(<span class="kw-2">&mut </span><span class="self">self</span>.cells[<span class="number">0</span>]) |
| } |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>promote(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>i: usize) { |
| <span class="macro">assert!</span>(i < <span class="self">self</span>.cells.len()); |
| <span class="kw">while </span>i > <span class="number">0 </span>{ |
| <span class="self">self</span>.cells.swap(i - <span class="number">1</span>, i); |
| i -= <span class="number">1</span>; |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>RegistryCell { |
| <span class="kw">fn </span>none() -> RegistryCell { |
| RegistryCell { |
| addr: NONE_ADDRESS, |
| node: BuilderNode::default(), |
| } |
| } |
| |
| <span class="kw">fn </span>is_none(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.addr == NONE_ADDRESS |
| } |
| |
| <span class="kw">pub fn </span>insert(<span class="kw-2">&mut </span><span class="self">self</span>, addr: CompiledAddr) { |
| <span class="self">self</span>.addr = addr; |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::{Registry, RegistryCache, RegistryCell, RegistryEntry}; |
| <span class="kw">use </span><span class="kw">crate</span>::raw::build::BuilderNode; |
| <span class="kw">use </span><span class="kw">crate</span>::raw::{Output, Transition}; |
| |
| <span class="kw">fn </span>assert_rejected(entry: RegistryEntry) { |
| <span class="kw">match </span>entry { |
| RegistryEntry::Rejected => {} |
| entry => <span class="macro">panic!</span>(<span class="string">"expected rejected entry, got: {:?}"</span>, entry), |
| } |
| } |
| |
| <span class="kw">fn </span>assert_not_found(entry: RegistryEntry) { |
| <span class="kw">match </span>entry { |
| RegistryEntry::NotFound(<span class="kw">_</span>) => {} |
| entry => <span class="macro">panic!</span>(<span class="string">"expected nout found entry, got: {:?}"</span>, entry), |
| } |
| } |
| |
| <span class="kw">fn </span>assert_insert_and_found(reg: <span class="kw-2">&mut </span>Registry, bnode: <span class="kw-2">&</span>BuilderNode) { |
| <span class="kw">match </span>reg.entry(<span class="kw-2">&</span>bnode) { |
| RegistryEntry::NotFound(cell) => cell.insert(<span class="number">1234</span>), |
| entry => <span class="macro">panic!</span>(<span class="string">"unexpected not found entry, got: {:?}"</span>, entry), |
| } |
| <span class="kw">match </span>reg.entry(<span class="kw-2">&</span>bnode) { |
| RegistryEntry::Found(addr) => <span class="macro">assert_eq!</span>(addr, <span class="number">1234</span>), |
| entry => <span class="macro">panic!</span>(<span class="string">"unexpected found entry, got: {:?}"</span>, entry), |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>empty_is_ok() { |
| <span class="kw">let </span><span class="kw-2">mut </span>reg = Registry::new(<span class="number">0</span>, <span class="number">0</span>); |
| <span class="kw">let </span>bnode = BuilderNode { |
| is_final: <span class="bool-val">false</span>, |
| final_output: Output::zero(), |
| trans: <span class="macro">vec!</span>[], |
| }; |
| assert_rejected(reg.entry(<span class="kw-2">&</span>bnode)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>one_final_is_ok() { |
| <span class="kw">let </span><span class="kw-2">mut </span>reg = Registry::new(<span class="number">1</span>, <span class="number">1</span>); |
| <span class="kw">let </span>bnode = BuilderNode { |
| is_final: <span class="bool-val">true</span>, |
| final_output: Output::zero(), |
| trans: <span class="macro">vec!</span>[], |
| }; |
| assert_insert_and_found(<span class="kw-2">&mut </span>reg, <span class="kw-2">&</span>bnode); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>one_with_trans_is_ok() { |
| <span class="kw">let </span><span class="kw-2">mut </span>reg = Registry::new(<span class="number">1</span>, <span class="number">1</span>); |
| <span class="kw">let </span>bnode = BuilderNode { |
| is_final: <span class="bool-val">false</span>, |
| final_output: Output::zero(), |
| trans: <span class="macro">vec!</span>[Transition { |
| addr: <span class="number">0</span>, |
| inp: <span class="string">b'a'</span>, |
| out: Output::zero(), |
| }], |
| }; |
| assert_insert_and_found(<span class="kw-2">&mut </span>reg, <span class="kw-2">&</span>bnode); |
| assert_not_found(reg.entry(<span class="kw-2">&</span>BuilderNode { |
| is_final: <span class="bool-val">true</span>, |
| ..bnode.clone() |
| })); |
| assert_not_found(reg.entry(<span class="kw-2">&</span>BuilderNode { |
| trans: <span class="macro">vec!</span>[Transition { |
| addr: <span class="number">0</span>, |
| inp: <span class="string">b'b'</span>, |
| out: Output::zero(), |
| }], |
| ..bnode.clone() |
| })); |
| assert_not_found(reg.entry(<span class="kw-2">&</span>BuilderNode { |
| trans: <span class="macro">vec!</span>[Transition { |
| addr: <span class="number">0</span>, |
| inp: <span class="string">b'a'</span>, |
| out: Output::new(<span class="number">1</span>), |
| }], |
| ..bnode.clone() |
| })); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>cache_works() { |
| <span class="kw">let </span><span class="kw-2">mut </span>reg = Registry::new(<span class="number">1</span>, <span class="number">1</span>); |
| |
| <span class="kw">let </span>bnode1 = BuilderNode { |
| is_final: <span class="bool-val">true</span>, |
| ..BuilderNode::default() |
| }; |
| assert_insert_and_found(<span class="kw-2">&mut </span>reg, <span class="kw-2">&</span>bnode1); |
| |
| <span class="kw">let </span>bnode2 = BuilderNode { |
| final_output: Output::new(<span class="number">1</span>), |
| ..bnode1.clone() |
| }; |
| assert_insert_and_found(<span class="kw-2">&mut </span>reg, <span class="kw-2">&</span>bnode2); |
| assert_not_found(reg.entry(<span class="kw-2">&</span>bnode1)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>promote() { |
| <span class="kw">let </span>bn = BuilderNode::default(); |
| <span class="kw">let </span><span class="kw-2">mut </span>bnodes = <span class="macro">vec!</span>[ |
| RegistryCell { |
| addr: <span class="number">1</span>, |
| node: bn.clone(), |
| }, |
| RegistryCell { |
| addr: <span class="number">2</span>, |
| node: bn.clone(), |
| }, |
| RegistryCell { |
| addr: <span class="number">3</span>, |
| node: bn.clone(), |
| }, |
| RegistryCell { |
| addr: <span class="number">4</span>, |
| node: bn.clone(), |
| }, |
| ]; |
| <span class="kw">let </span><span class="kw-2">mut </span>cache = RegistryCache { cells: <span class="kw-2">&mut </span>bnodes }; |
| |
| cache.promote(<span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">0</span>].addr, <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">1</span>].addr, <span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">2</span>].addr, <span class="number">3</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">3</span>].addr, <span class="number">4</span>); |
| |
| cache.promote(<span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">0</span>].addr, <span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">1</span>].addr, <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">2</span>].addr, <span class="number">3</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">3</span>].addr, <span class="number">4</span>); |
| |
| cache.promote(<span class="number">3</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">0</span>].addr, <span class="number">4</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">1</span>].addr, <span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">2</span>].addr, <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">3</span>].addr, <span class="number">3</span>); |
| |
| cache.promote(<span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">0</span>].addr, <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">1</span>].addr, <span class="number">4</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">2</span>].addr, <span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(cache.cells[<span class="number">3</span>].addr, <span class="number">3</span>); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="tantivy_fst" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
