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 <!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/node.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>node.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>std::cmp;
 <span class="kw">use </span>std::fmt;
 <span class="kw">use </span>std::io;
 <span class="kw">use </span>std::ops::Range;

 <span class="kw">use </span>byteorder::WriteBytesExt;

 <span class="kw">use </span><span class="kw">crate</span>::raw::build::BuilderNode;
 <span class="kw">use </span><span class="kw">crate</span>::raw::common_inputs::{COMMON_INPUTS, COMMON_INPUTS_INV};
 <span class="kw">use </span><span class="kw">crate</span>::raw::pack::{pack_size, pack_uint, pack_uint_in, unpack_uint};
 <span class="kw">use </span><span class="kw">crate</span>::raw::{u64_to_usize, CompiledAddr, Output, Transition, EMPTY_ADDRESS};

 <span class="doccomment">/// The threshold (in number of transitions) at which an index is created for
 /// a node&#39;s transitions. This speeds up lookup time at the expense of FST
 /// size.
 </span><span class="kw">const </span>TRANS_INDEX_THRESHOLD: usize = <span class="number">32</span>;

 <span class="doccomment">/// Node represents a single state in a finite state transducer.
 ///
 /// Nodes are very cheap to construct. Notably, they satisfy the `Copy` trait.
 </span><span class="attribute">#[derive(Clone, Copy)]
 </span><span class="kw">pub struct </span>Node&lt;<span class="lifetime">&#39;f</span>&gt; {
     data: <span class="kw-2">&amp;</span><span class="lifetime">&#39;f </span>[u8],
     version: u64,
     state: State,
     start: CompiledAddr,
     end: usize,
     is_final: bool,
     ntrans: usize,
     sizes: PackSizes,
     final_output: Output,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;f</span>&gt; fmt::Debug <span class="kw">for </span>Node&lt;<span class="lifetime">&#39;f</span>&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         <span class="macro">writeln!</span>(f, <span class="string">&quot;NODE@{}&quot;</span>, <span class="self">self</span>.start)<span class="question-mark">?</span>;
         <span class="macro">writeln!</span>(f, <span class="string">&quot;  end_addr: {}&quot;</span>, <span class="self">self</span>.end)<span class="question-mark">?</span>;
         <span class="macro">writeln!</span>(f, <span class="string">&quot;  size: {} bytes&quot;</span>, <span class="self">self</span>.as_slice().len())<span class="question-mark">?</span>;
         <span class="macro">writeln!</span>(f, <span class="string">&quot;  state: {:?}&quot;</span>, <span class="self">self</span>.state)<span class="question-mark">?</span>;
         <span class="macro">writeln!</span>(f, <span class="string">&quot;  is_final: {}&quot;</span>, <span class="self">self</span>.is_final())<span class="question-mark">?</span>;
         <span class="macro">writeln!</span>(f, <span class="string">&quot;  final_output: {:?}&quot;</span>, <span class="self">self</span>.final_output())<span class="question-mark">?</span>;
         <span class="macro">writeln!</span>(f, <span class="string">&quot;  # transitions: {}&quot;</span>, <span class="self">self</span>.len())<span class="question-mark">?</span>;
         <span class="macro">writeln!</span>(f, <span class="string">&quot;  transitions:&quot;</span>)<span class="question-mark">?</span>;
         <span class="kw">for </span>t <span class="kw">in </span><span class="self">self</span>.transitions() {
             <span class="macro">writeln!</span>(f, <span class="string">&quot;    {:?}&quot;</span>, t)<span class="question-mark">?</span>;
         }
         <span class="prelude-val">Ok</span>(())
     }
 }

 <span class="doccomment">/// Creates a new note at the address given.
 ///
 /// `data` should be a slice to an entire FST.
 ///
 /// This is a free function so that we can export it to parent modules, but
 /// not to consumers of this crate.
 </span><span class="attribute">#[inline(always)]
 </span><span class="kw">pub fn </span>node_new(version: u64, addr: CompiledAddr, data: <span class="kw-2">&amp;</span>[u8]) -&gt; Node {
     <span class="kw">use </span><span class="self">self</span>::State::<span class="kw-2">*</span>;
     <span class="kw">let </span>state = State::new(data, addr);
     <span class="kw">match </span>state {
         EmptyFinal =&gt; Node {
             data: <span class="kw-2">&amp;</span>[],
             version,
             state: State::EmptyFinal,
             start: EMPTY_ADDRESS,
             end: EMPTY_ADDRESS,
             is_final: <span class="bool-val">true</span>,
             ntrans: <span class="number">0</span>,
             sizes: PackSizes::new(),
             final_output: Output::zero(),
         },
         OneTransNext(s) =&gt; {
             <span class="kw">let </span>data = <span class="kw-2">&amp;</span>data[..=addr];
             Node {
                 data,
                 version,
                 state,
                 start: addr,
                 end: s.end_addr(data),
                 is_final: <span class="bool-val">false</span>,
                 sizes: PackSizes::new(),
                 ntrans: <span class="number">1</span>,
                 final_output: Output::zero(),
             }
         }
         OneTrans(s) =&gt; {
             <span class="kw">let </span>data = <span class="kw-2">&amp;</span>data[..=addr];
             <span class="kw">let </span>sizes = s.sizes(data);
             Node {
                 data,
                 version,
                 state,
                 start: addr,
                 end: s.end_addr(data, sizes),
                 is_final: <span class="bool-val">false</span>,
                 ntrans: <span class="number">1</span>,
                 sizes,
                 final_output: Output::zero(),
             }
         }
         AnyTrans(s) =&gt; {
             <span class="kw">let </span>data = <span class="kw-2">&amp;</span>data[..=addr];
             <span class="kw">let </span>sizes = s.sizes(data);
             <span class="kw">let </span>ntrans = s.ntrans(data);
             Node {
                 data,
                 version,
                 state,
                 start: addr,
                 end: s.end_addr(version, data, sizes, ntrans),
                 is_final: s.is_final_state(),
                 ntrans,
                 sizes,
                 final_output: s.final_output(version, data, sizes, ntrans),
             }
         }
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;f</span>&gt; Node&lt;<span class="lifetime">&#39;f</span>&gt; {
     <span class="doccomment">/// Returns an iterator over all transitions in this node in lexicographic
     /// order.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>transitions&lt;<span class="lifetime">&#39;n</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;n </span><span class="self">self</span>) -&gt; Transitions&lt;<span class="lifetime">&#39;f</span>, <span class="lifetime">&#39;n</span>&gt; {
         Transitions {
             node: <span class="self">self</span>,
             range: <span class="number">0</span>..<span class="self">self</span>.len(),
         }
     }

     <span class="doccomment">/// Returns the transition at index `i`.
     </span><span class="attribute">#[inline(always)]
     </span><span class="kw">pub fn </span>transition(<span class="kw-2">&amp;</span><span class="self">self</span>, i: usize) -&gt; Transition {
         <span class="kw">use </span><span class="self">self</span>::State::<span class="kw-2">*</span>;
         <span class="kw">match </span><span class="self">self</span>.state {
             OneTransNext(s) =&gt; {
                 <span class="macro">assert_eq!</span>(i, <span class="number">0</span>);
                 Transition {
                     inp: s.input(<span class="self">self</span>),
                     out: Output::zero(),
                     addr: s.trans_addr(<span class="self">self</span>),
                 }
             }
             OneTrans(s) =&gt; {
                 <span class="macro">assert_eq!</span>(i, <span class="number">0</span>);
                 Transition {
                     inp: s.input(<span class="self">self</span>),
                     out: s.output(<span class="self">self</span>),
                     addr: s.trans_addr(<span class="self">self</span>),
                 }
             }
             AnyTrans(s) =&gt; Transition {
                 inp: s.input(<span class="self">self</span>, i),
                 out: s.output(<span class="self">self</span>, i),
                 addr: s.trans_addr(<span class="self">self</span>, i),
             },
             EmptyFinal =&gt; <span class="macro">panic!</span>(<span class="string">&quot;out of bounds&quot;</span>),
         }
     }

     <span class="doccomment">/// Returns the transition address of the `i`th transition.
     </span><span class="attribute">#[inline(always)]
     </span><span class="kw">pub fn </span>transition_addr(<span class="kw-2">&amp;</span><span class="self">self</span>, i: usize) -&gt; CompiledAddr {
         <span class="kw">use </span><span class="self">self</span>::State::<span class="kw-2">*</span>;
         <span class="kw">match </span><span class="self">self</span>.state {
             OneTransNext(s) =&gt; {
                 <span class="macro">assert_eq!</span>(i, <span class="number">0</span>);
                 s.trans_addr(<span class="self">self</span>)
             }
             OneTrans(s) =&gt; {
                 <span class="macro">assert_eq!</span>(i, <span class="number">0</span>);
                 s.trans_addr(<span class="self">self</span>)
             }
             AnyTrans(s) =&gt; s.trans_addr(<span class="self">self</span>, i),
             EmptyFinal =&gt; <span class="macro">panic!</span>(<span class="string">&quot;out of bounds&quot;</span>),
         }
     }

     <span class="doccomment">/// Finds the `i`th transition corresponding to the given input byte.
     ///
     /// If no transition for this byte exists, then `None` is returned.
     </span><span class="attribute">#[inline(always)]
     </span><span class="kw">pub fn </span>find_input(<span class="kw-2">&amp;</span><span class="self">self</span>, b: u8) -&gt; <span class="prelude-ty">Option</span>&lt;usize&gt; {
         <span class="kw">use </span><span class="self">self</span>::State::<span class="kw-2">*</span>;
         <span class="kw">match </span><span class="self">self</span>.state {
             OneTransNext(s) <span class="kw">if </span>s.input(<span class="self">self</span>) == b =&gt; <span class="prelude-val">Some</span>(<span class="number">0</span>),
             OneTransNext(<span class="kw">_</span>) =&gt; <span class="prelude-val">None</span>,
             OneTrans(s) <span class="kw">if </span>s.input(<span class="self">self</span>) == b =&gt; <span class="prelude-val">Some</span>(<span class="number">0</span>),
             OneTrans(<span class="kw">_</span>) =&gt; <span class="prelude-val">None</span>,
             AnyTrans(s) =&gt; s.find_input(<span class="self">self</span>, b),
             EmptyFinal =&gt; <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// If this node is final and has a terminal output value, then it is
     /// returned. Otherwise, a zero output is returned.
     </span><span class="attribute">#[inline(always)]
     </span><span class="kw">pub fn </span>final_output(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Output {
         <span class="self">self</span>.final_output
     }

     <span class="doccomment">/// Returns true if and only if this node corresponds to a final or &quot;match&quot;
     /// state in the finite state transducer.
     </span><span class="attribute">#[inline(always)]
     </span><span class="kw">pub fn </span>is_final(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.is_final
     }

     <span class="doccomment">/// Returns the number of transitions in this node.
     ///
     /// The maximum number of transitions is 256.
     </span><span class="attribute">#[inline(always)]
     </span><span class="kw">pub fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.ntrans
     }

     <span class="doccomment">/// Returns true if and only if this node has zero transitions.
     </span><span class="attribute">#[inline(always)]
     </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.ntrans == <span class="number">0
     </span>}

     <span class="doccomment">/// Return the address of this node.
     </span><span class="attribute">#[inline(always)]
     </span><span class="kw">pub fn </span>addr(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; CompiledAddr {
         <span class="self">self</span>.start
     }

     <span class="attribute">#[doc(hidden)]
     #[inline(always)]
     </span><span class="kw">pub fn </span>as_slice(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[u8] {
         <span class="kw-2">&amp;</span><span class="self">self</span>.data[<span class="self">self</span>.end..]
     }

     <span class="attribute">#[doc(hidden)]
     #[inline(always)]
     </span><span class="kw">pub fn </span>state(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str {
         <span class="kw">use </span><span class="self">self</span>::State::<span class="kw-2">*</span>;
         <span class="kw">match </span><span class="self">self</span>.state {
             OneTransNext(<span class="kw">_</span>) =&gt; <span class="string">&quot;OTN&quot;</span>,
             OneTrans(<span class="kw">_</span>) =&gt; <span class="string">&quot;OT&quot;</span>,
             AnyTrans(<span class="kw">_</span>) =&gt; <span class="string">&quot;AT&quot;</span>,
             EmptyFinal =&gt; <span class="string">&quot;EF&quot;</span>,
         }
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>compile&lt;W: io::Write&gt;(
         wtr: W,
         last_addr: CompiledAddr,
         addr: CompiledAddr,
         node: <span class="kw-2">&amp;</span>BuilderNode,
     ) -&gt; io::Result&lt;()&gt; {
         <span class="macro">assert!</span>(node.trans.len() &lt;= <span class="number">256</span>);
         <span class="kw">if </span>node.trans.is_empty() &amp;&amp; node.is_final &amp;&amp; node.final_output.is_zero() {
             <span class="prelude-val">Ok</span>(())
         } <span class="kw">else if </span>node.trans.len() != <span class="number">1 </span>|| node.is_final {
             StateAnyTrans::compile(wtr, addr, node)
         } <span class="kw">else if </span>node.is_final || node.trans[<span class="number">0</span>].addr != last_addr || !node.trans[<span class="number">0</span>].out.is_zero() {
             StateOneTrans::compile(wtr, addr, node.trans[<span class="number">0</span>])
         } <span class="kw">else </span>{
             StateOneTransNext::compile(wtr, addr, node.trans[<span class="number">0</span>].inp)
         }
     }
 }

 <span class="kw">impl </span>BuilderNode {
     <span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>compile_to&lt;W: io::Write&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         wtr: W,
         last_addr: CompiledAddr,
         addr: CompiledAddr,
     ) -&gt; io::Result&lt;()&gt; {
         Node::compile(wtr, last_addr, addr, <span class="self">self</span>)
     }
 }

 <span class="attribute">#[derive(Clone, Copy, Debug)]
 </span><span class="kw">enum </span>State {
     OneTransNext(StateOneTransNext),
     OneTrans(StateOneTrans),
     AnyTrans(StateAnyTrans),
     EmptyFinal,
 }

 <span class="comment">// one trans flag (1), next flag (1), common input
 </span><span class="attribute">#[derive(Clone, Copy, Debug)]
 </span><span class="kw">struct </span>StateOneTransNext(u8);
 <span class="comment">// one trans flag (1), next flag (0), common input
 </span><span class="attribute">#[derive(Clone, Copy, Debug)]
 </span><span class="kw">struct </span>StateOneTrans(u8);
 <span class="comment">// one trans flag (0), final flag, # transitions
 </span><span class="attribute">#[derive(Clone, Copy, Debug)]
 </span><span class="kw">struct </span>StateAnyTrans(u8);

 <span class="kw">impl </span>State {
     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>new(data: <span class="kw-2">&amp;</span>[u8], addr: CompiledAddr) -&gt; State {
         <span class="kw">use </span><span class="self">self</span>::State::<span class="kw-2">*</span>;
         <span class="kw">if </span>addr == EMPTY_ADDRESS {
             <span class="kw">return </span>EmptyFinal;
         }
         <span class="kw">let </span>v = data[addr];
         <span class="kw">match </span>(v &amp; <span class="number">0b11_000000</span>) &gt;&gt; <span class="number">6 </span>{
             <span class="number">0b11 </span>=&gt; OneTransNext(StateOneTransNext(v)),
             <span class="number">0b10 </span>=&gt; OneTrans(StateOneTrans(v)),
             <span class="kw">_ </span>=&gt; AnyTrans(StateAnyTrans(v)),
         }
     }
 }

 <span class="kw">impl </span>StateOneTransNext {
     <span class="kw">fn </span>compile&lt;W: io::Write&gt;(<span class="kw-2">mut </span>wtr: W, <span class="kw">_</span>: CompiledAddr, input: u8) -&gt; io::Result&lt;()&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>state = StateOneTransNext::new();
         state.set_common_input(input);
         <span class="kw">if </span>state.common_input().is_none() {
             wtr.write_u8(input)<span class="question-mark">?</span>;
         }
         wtr.write_u8(state.<span class="number">0</span>).map_err(From::from)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>new() -&gt; <span class="self">Self </span>{
         StateOneTransNext(<span class="number">0b11_000000</span>)
     }

     <span class="kw">fn </span>set_common_input(<span class="kw-2">&amp;mut </span><span class="self">self</span>, input: u8) {
         <span class="self">self</span>.<span class="number">0 </span>= (<span class="self">self</span>.<span class="number">0 </span>&amp; <span class="number">0b11_000000</span>) | common_idx(input, <span class="number">0b11_1111</span>);
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>common_input(<span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;u8&gt; {
         common_input(<span class="self">self</span>.<span class="number">0 </span>&amp; <span class="number">0b00_111111</span>)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>input_len(<span class="self">self</span>) -&gt; usize {
         <span class="kw">if </span><span class="self">self</span>.common_input().is_none() {
             <span class="number">1
         </span>} <span class="kw">else </span>{
             <span class="number">0
         </span>}
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>end_addr(<span class="self">self</span>, data: <span class="kw-2">&amp;</span>[u8]) -&gt; usize {
         data.len() - <span class="number">1 </span>- <span class="self">self</span>.input_len()
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>input(<span class="self">self</span>, node: <span class="kw-2">&amp;</span>Node) -&gt; u8 {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(inp) = <span class="self">self</span>.common_input() {
             inp
         } <span class="kw">else </span>{
             node.data[node.start - <span class="number">1</span>]
         }
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>trans_addr(<span class="self">self</span>, node: <span class="kw-2">&amp;</span>Node) -&gt; CompiledAddr {
         node.end <span class="kw">as </span>CompiledAddr - <span class="number">1
     </span>}
 }

 <span class="kw">impl </span>StateOneTrans {
     <span class="kw">fn </span>compile&lt;W: io::Write&gt;(<span class="kw-2">mut </span>wtr: W, addr: CompiledAddr, trans: Transition) -&gt; io::Result&lt;()&gt; {
         <span class="kw">let </span>out = trans.out.value();
         <span class="kw">let </span>output_pack_size = <span class="kw">if </span>out == <span class="number">0 </span>{
             <span class="number">0
         </span>} <span class="kw">else </span>{
             pack_uint(<span class="kw-2">&amp;mut </span>wtr, out)<span class="question-mark">?
         </span>};
         <span class="kw">let </span>trans_pack_size = pack_delta(<span class="kw-2">&amp;mut </span>wtr, addr, trans.addr)<span class="question-mark">?</span>;

         <span class="kw">let </span><span class="kw-2">mut </span>pack_sizes = PackSizes::new();
         pack_sizes.set_output_pack_size(output_pack_size);
         pack_sizes.set_transition_pack_size(trans_pack_size);
         wtr.write_u8(pack_sizes.encode())<span class="question-mark">?</span>;

         <span class="kw">let </span><span class="kw-2">mut </span>state = StateOneTrans::new();
         state.set_common_input(trans.inp);
         <span class="kw">if </span>state.common_input().is_none() {
             wtr.write_u8(trans.inp)<span class="question-mark">?</span>;
         }
         wtr.write_u8(state.<span class="number">0</span>).map_err(From::from)
     }

     <span class="kw">fn </span>new() -&gt; <span class="self">Self </span>{
         StateOneTrans(<span class="number">0b10_000000</span>)
     }

     <span class="kw">fn </span>set_common_input(<span class="kw-2">&amp;mut </span><span class="self">self</span>, input: u8) {
         <span class="self">self</span>.<span class="number">0 </span>= (<span class="self">self</span>.<span class="number">0 </span>&amp; <span class="number">0b10_000000</span>) | common_idx(input, <span class="number">0b11_1111</span>);
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>common_input(<span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;u8&gt; {
         common_input(<span class="self">self</span>.<span class="number">0 </span>&amp; <span class="number">0b00_111111</span>)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>input_len(<span class="self">self</span>) -&gt; usize {
         <span class="kw">if </span><span class="self">self</span>.common_input().is_none() {
             <span class="number">1
         </span>} <span class="kw">else </span>{
             <span class="number">0
         </span>}
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>sizes(<span class="self">self</span>, data: <span class="kw-2">&amp;</span>[u8]) -&gt; PackSizes {
         <span class="kw">let </span>i = data.len() - <span class="number">1 </span>- <span class="self">self</span>.input_len() - <span class="number">1</span>;
         PackSizes::decode(data[i])
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>end_addr(<span class="self">self</span>, data: <span class="kw-2">&amp;</span>[u8], sizes: PackSizes) -&gt; usize {
         data.len() - <span class="number">1
         </span>- <span class="self">self</span>.input_len()
         - <span class="number">1 </span><span class="comment">// pack size
         </span>- sizes.transition_pack_size()
         - sizes.output_pack_size()
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>input(<span class="self">self</span>, node: <span class="kw-2">&amp;</span>Node) -&gt; u8 {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(inp) = <span class="self">self</span>.common_input() {
             inp
         } <span class="kw">else </span>{
             node.data[node.start - <span class="number">1</span>]
         }
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>output(<span class="self">self</span>, node: <span class="kw-2">&amp;</span>Node) -&gt; Output {
         <span class="kw">let </span>osize = node.sizes.output_pack_size();
         <span class="kw">if </span>osize == <span class="number">0 </span>{
             <span class="kw">return </span>Output::zero();
         }
         <span class="kw">let </span>tsize = node.sizes.transition_pack_size();
         <span class="kw">let </span>i = node.start
                 - <span class="self">self</span>.input_len()
                 - <span class="number">1 </span><span class="comment">// pack size
                 </span>- tsize - osize;
         Output::new(unpack_uint(<span class="kw-2">&amp;</span>node.data[i..], osize <span class="kw">as </span>u8))
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>trans_addr(<span class="self">self</span>, node: <span class="kw-2">&amp;</span>Node) -&gt; CompiledAddr {
         <span class="kw">let </span>tsize = node.sizes.transition_pack_size();
         <span class="kw">let </span>i = node.start
                 - <span class="self">self</span>.input_len()
                 - <span class="number">1 </span><span class="comment">// pack size
                 </span>- tsize;
         unpack_delta(<span class="kw-2">&amp;</span>node.data[i..], tsize, node.end)
     }
 }

 <span class="kw">impl </span>StateAnyTrans {
     <span class="kw">fn </span>compile&lt;W: io::Write&gt;(<span class="kw-2">mut </span>wtr: W, addr: CompiledAddr, node: <span class="kw-2">&amp;</span>BuilderNode) -&gt; io::Result&lt;()&gt; {
         <span class="macro">assert!</span>(node.trans.len() &lt;= <span class="number">256</span>);

         <span class="kw">let </span><span class="kw-2">mut </span>tsize = <span class="number">0</span>;
         <span class="kw">let </span><span class="kw-2">mut </span>osize = pack_size(node.final_output.value());
         <span class="kw">let </span><span class="kw-2">mut </span>any_outs = !node.final_output.is_zero();
         <span class="kw">for </span>t <span class="kw">in </span><span class="kw-2">&amp;</span>node.trans {
             tsize = cmp::max(tsize, pack_delta_size(addr, t.addr));
             osize = cmp::max(osize, pack_size(t.out.value()));
             any_outs = any_outs || !t.out.is_zero();
         }

         <span class="kw">let </span><span class="kw-2">mut </span>pack_sizes = PackSizes::new();
         <span class="kw">if </span>any_outs {
             pack_sizes.set_output_pack_size(osize);
         } <span class="kw">else </span>{
             pack_sizes.set_output_pack_size(<span class="number">0</span>);
         }
         pack_sizes.set_transition_pack_size(tsize);

         <span class="kw">let </span><span class="kw-2">mut </span>state = StateAnyTrans::new();
         state.set_final_state(node.is_final);
         state.set_state_ntrans(node.trans.len() <span class="kw">as </span>u8);

         <span class="kw">if </span>any_outs {
             <span class="kw">if </span>node.is_final {
                 pack_uint_in(<span class="kw-2">&amp;mut </span>wtr, node.final_output.value(), osize)<span class="question-mark">?</span>;
             }
             <span class="kw">for </span>t <span class="kw">in </span>node.trans.iter().rev() {
                 pack_uint_in(<span class="kw-2">&amp;mut </span>wtr, t.out.value(), osize)<span class="question-mark">?</span>;
             }
         }
         <span class="kw">for </span>t <span class="kw">in </span>node.trans.iter().rev() {
             pack_delta_in(<span class="kw-2">&amp;mut </span>wtr, addr, t.addr, tsize)<span class="question-mark">?</span>;
         }
         <span class="kw">for </span>t <span class="kw">in </span>node.trans.iter().rev() {
             wtr.write_u8(t.inp)<span class="question-mark">?</span>;
         }
         <span class="kw">if </span>node.trans.len() &gt; TRANS_INDEX_THRESHOLD {
             <span class="comment">// A value of 255 indicates that no transition exists for the byte
             // at that index. (Except when there are 256 transitions.) Namely,
             // any value greater than or equal to the number of transitions in
             // this node indicates an absent transition.
             </span><span class="kw">let </span><span class="kw-2">mut </span>index = [<span class="number">255u8</span>; <span class="number">256</span>];
             <span class="kw">for </span>(i, t) <span class="kw">in </span>node.trans.iter().enumerate() {
                 index[t.inp <span class="kw">as </span>usize] = i <span class="kw">as </span>u8;
             }
             wtr.write_all(<span class="kw-2">&amp;</span>index)<span class="question-mark">?</span>;
         }

         wtr.write_u8(pack_sizes.encode())<span class="question-mark">?</span>;
         <span class="kw">if </span>state.state_ntrans().is_none() {
             <span class="kw">if </span>node.trans.len() == <span class="number">256 </span>{
                 <span class="comment">// 256 can&#39;t be represented in a u8, so we abuse the fact that
                 // the # of transitions can never be 1 here, since 1 is always
                 // encoded in the state byte.
                 </span>wtr.write_u8(<span class="number">1</span>)<span class="question-mark">?</span>;
             } <span class="kw">else </span>{
                 wtr.write_u8(node.trans.len() <span class="kw">as </span>u8)<span class="question-mark">?</span>;
             }
         }
         wtr.write_u8(state.<span class="number">0</span>).map_err(From::from)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>new() -&gt; <span class="self">Self </span>{
         StateAnyTrans(<span class="number">0b00_000000</span>)
     }

     <span class="kw">fn </span>set_final_state(<span class="kw-2">&amp;mut </span><span class="self">self</span>, yes: bool) {
         <span class="kw">if </span>yes {
             <span class="self">self</span>.<span class="number">0 </span>|= <span class="number">0b01_000000</span>;
         }
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>is_final_state(<span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.<span class="number">0 </span>&amp; <span class="number">0b01_000000 </span>== <span class="number">0b01_000000
     </span>}

     <span class="kw">fn </span>set_state_ntrans(<span class="kw-2">&amp;mut </span><span class="self">self</span>, n: u8) {
         <span class="kw">if </span>n &lt;= <span class="number">0b00_111111 </span>{
             <span class="self">self</span>.<span class="number">0 </span>= (<span class="self">self</span>.<span class="number">0 </span>&amp; <span class="number">0b11_000000</span>) | n;
         }
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>state_ntrans(<span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;u8&gt; {
         <span class="kw">let </span>n = <span class="self">self</span>.<span class="number">0 </span>&amp; <span class="number">0b00_111111</span>;
         <span class="kw">if </span>n == <span class="number">0 </span>{
             <span class="prelude-val">None
         </span>} <span class="kw">else </span>{
             <span class="prelude-val">Some</span>(n)
         }
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>sizes(<span class="self">self</span>, data: <span class="kw-2">&amp;</span>[u8]) -&gt; PackSizes {
         <span class="kw">let </span>i = data.len() - <span class="number">1 </span>- <span class="self">self</span>.ntrans_len() - <span class="number">1</span>;
         PackSizes::decode(data[i])
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>total_trans_size(<span class="self">self</span>, version: u64, sizes: PackSizes, ntrans: usize) -&gt; usize {
         <span class="kw">let </span>index_size = <span class="self">self</span>.trans_index_size(version, ntrans);
         ntrans + (ntrans * sizes.transition_pack_size()) + index_size
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>trans_index_size(<span class="self">self</span>, version: u64, ntrans: usize) -&gt; usize {
         <span class="kw">if </span>version &gt;= <span class="number">2 </span>&amp;&amp; ntrans &gt; TRANS_INDEX_THRESHOLD {
             <span class="number">256
         </span>} <span class="kw">else </span>{
             <span class="number">0
         </span>}
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>ntrans_len(<span class="self">self</span>) -&gt; usize {
         <span class="kw">if </span><span class="self">self</span>.state_ntrans().is_none() {
             <span class="number">1
         </span>} <span class="kw">else </span>{
             <span class="number">0
         </span>}
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>ntrans(<span class="self">self</span>, data: <span class="kw-2">&amp;</span>[u8]) -&gt; usize {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(n) = <span class="self">self</span>.state_ntrans() {
             n <span class="kw">as </span>usize
         } <span class="kw">else </span>{
             <span class="kw">let </span>n = data[data.len() - <span class="number">2</span>] <span class="kw">as </span>usize;
             <span class="kw">if </span>n == <span class="number">1 </span>{
                 <span class="comment">// &quot;1&quot; is never a normal legal value here, because if there
                 // is only 1 transition, then it is encoded in the state byte.
                 </span><span class="number">256
             </span>} <span class="kw">else </span>{
                 n
             }
         }
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>final_output(<span class="self">self</span>, version: u64, data: <span class="kw-2">&amp;</span>[u8], sizes: PackSizes, ntrans: usize) -&gt; Output {
         <span class="kw">let </span>osize = sizes.output_pack_size();
         <span class="kw">if </span>osize == <span class="number">0 </span>|| !<span class="self">self</span>.is_final_state() {
             <span class="kw">return </span>Output::zero();
         }
         <span class="kw">let </span>at = data.len() - <span class="number">1
                  </span>- <span class="self">self</span>.ntrans_len()
                  - <span class="number">1 </span><span class="comment">// pack size
                  </span>- <span class="self">self</span>.total_trans_size(version, sizes, ntrans)
                  - (ntrans * osize) <span class="comment">// output values
                  </span>- osize; <span class="comment">// the desired output value
         </span>Output::new(unpack_uint(<span class="kw-2">&amp;</span>data[at..], osize <span class="kw">as </span>u8))
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>end_addr(<span class="self">self</span>, version: u64, data: <span class="kw-2">&amp;</span>[u8], sizes: PackSizes, ntrans: usize) -&gt; usize {
         <span class="kw">let </span>osize = sizes.output_pack_size();
         <span class="kw">let </span>final_osize = <span class="kw">if </span>!<span class="self">self</span>.is_final_state() { <span class="number">0 </span>} <span class="kw">else </span>{ osize };
         data.len() - <span class="number">1
         </span>- <span class="self">self</span>.ntrans_len()
         - <span class="number">1 </span><span class="comment">// pack size
         </span>- <span class="self">self</span>.total_trans_size(version, sizes, ntrans)
         - (ntrans * osize) <span class="comment">// output values
         </span>- final_osize <span class="comment">// final output
     </span>}

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>trans_addr(<span class="self">self</span>, node: <span class="kw-2">&amp;</span>Node, i: usize) -&gt; CompiledAddr {
         <span class="macro">assert!</span>(i &lt; node.ntrans);
         <span class="kw">let </span>tsize = node.sizes.transition_pack_size();
         <span class="kw">let </span>at = node.start
                  - <span class="self">self</span>.ntrans_len()
                  - <span class="number">1 </span><span class="comment">// pack size
                  </span>- <span class="self">self</span>.trans_index_size(node.version, node.ntrans)
                  - node.ntrans <span class="comment">// inputs
                  </span>- (i * tsize) <span class="comment">// the previous transition addresses
                  </span>- tsize; <span class="comment">// the desired transition address
         </span>unpack_delta(<span class="kw-2">&amp;</span>node.data[at..], tsize, node.end)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>input(<span class="self">self</span>, node: <span class="kw-2">&amp;</span>Node, i: usize) -&gt; u8 {
         <span class="kw">let </span>at = node.start
                  - <span class="self">self</span>.ntrans_len()
                  - <span class="number">1 </span><span class="comment">// pack size
                  </span>- <span class="self">self</span>.trans_index_size(node.version, node.ntrans)
                  - i
                  - <span class="number">1</span>; <span class="comment">// the input byte
         </span>node.data[at]
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>find_input(<span class="self">self</span>, node: <span class="kw-2">&amp;</span>Node, b: u8) -&gt; <span class="prelude-ty">Option</span>&lt;usize&gt; {
         <span class="kw">if </span>node.version &gt;= <span class="number">2 </span>&amp;&amp; node.ntrans &gt; TRANS_INDEX_THRESHOLD {
             <span class="kw">let </span>start = node.start
                         - <span class="self">self</span>.ntrans_len()
                         - <span class="number">1 </span><span class="comment">// pack size
                         </span>- <span class="self">self</span>.trans_index_size(node.version, node.ntrans);
             <span class="kw">let </span>i = node.data[start + b <span class="kw">as </span>usize] <span class="kw">as </span>usize;
             <span class="kw">if </span>i &gt;= node.ntrans {
                 <span class="prelude-val">None
             </span>} <span class="kw">else </span>{
                 <span class="prelude-val">Some</span>(i)
             }
         } <span class="kw">else </span>{
             <span class="kw">let </span>start = node.start
                         - <span class="self">self</span>.ntrans_len()
                         - <span class="number">1 </span><span class="comment">// pack size
                         </span>- node.ntrans; <span class="comment">// inputs
             </span><span class="kw">let </span>end = start + node.ntrans;
             <span class="kw">let </span>inputs = <span class="kw-2">&amp;</span>node.data[start..end];
             inputs
                 .iter()
                 .position(|<span class="kw-2">&amp;</span>b2| b == b2)
                 .map(|i| node.ntrans - i - <span class="number">1</span>)
         }
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>output(<span class="self">self</span>, node: <span class="kw-2">&amp;</span>Node, i: usize) -&gt; Output {
         <span class="kw">let </span>osize = node.sizes.output_pack_size();
         <span class="kw">if </span>osize == <span class="number">0 </span>{
             <span class="kw">return </span>Output::zero();
         }
         <span class="kw">let </span>at = node.start
                  - <span class="self">self</span>.ntrans_len()
                  - <span class="number">1 </span><span class="comment">// pack size
                  </span>- <span class="self">self</span>.total_trans_size(node.version, node.sizes, node.ntrans)
                  - (i * osize) <span class="comment">// the previous outputs
                  </span>- osize; <span class="comment">// the desired output value
         </span>Output::new(unpack_uint(<span class="kw-2">&amp;</span>node.data[at..], osize <span class="kw">as </span>u8))
     }
 }

 <span class="comment">// high 4 bits is transition address packed size.
 // low 4 bits is output value packed size.
 //
 // `0` is a legal value which means there are no transitions/outputs.
 </span><span class="attribute">#[derive(Clone, Copy, Debug)]
 </span><span class="kw">struct </span>PackSizes(u8);

 <span class="kw">impl </span>PackSizes {
     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>new() -&gt; <span class="self">Self </span>{
         PackSizes(<span class="number">0</span>)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>decode(v: u8) -&gt; <span class="self">Self </span>{
         PackSizes(v)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>encode(<span class="self">self</span>) -&gt; u8 {
         <span class="self">self</span>.<span class="number">0
     </span>}

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>set_transition_pack_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, size: u8) {
         <span class="macro">assert!</span>(size &lt;= <span class="number">8</span>);
         <span class="self">self</span>.<span class="number">0 </span>= (<span class="self">self</span>.<span class="number">0 </span>&amp; <span class="number">0b0000_1111</span>) | (size &lt;&lt; <span class="number">4</span>);
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>transition_pack_size(<span class="self">self</span>) -&gt; usize {
         ((<span class="self">self</span>.<span class="number">0 </span>&amp; <span class="number">0b1111_0000</span>) &gt;&gt; <span class="number">4</span>) <span class="kw">as </span>usize
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>set_output_pack_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, size: u8) {
         <span class="macro">assert!</span>(size &lt;= <span class="number">8</span>);
         <span class="self">self</span>.<span class="number">0 </span>= (<span class="self">self</span>.<span class="number">0 </span>&amp; <span class="number">0b1111_0000</span>) | size;
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>output_pack_size(<span class="self">self</span>) -&gt; usize {
         (<span class="self">self</span>.<span class="number">0 </span>&amp; <span class="number">0b0000_1111</span>) <span class="kw">as </span>usize
     }
 }

 <span class="doccomment">/// An iterator over all transitions in a node.
 ///
 /// `&#39;f` is the lifetime of the underlying fst and `&#39;n` is the lifetime of
 /// the underlying `Node`.
 </span><span class="kw">pub struct </span>Transitions&lt;<span class="lifetime">&#39;f</span>: <span class="lifetime">&#39;n</span>, <span class="lifetime">&#39;n</span>&gt; {
     node: <span class="kw-2">&amp;</span><span class="lifetime">&#39;n </span>Node&lt;<span class="lifetime">&#39;f</span>&gt;,
     range: Range&lt;usize&gt;,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;f</span>, <span class="lifetime">&#39;n</span>&gt; Iterator <span class="kw">for </span>Transitions&lt;<span class="lifetime">&#39;f</span>, <span class="lifetime">&#39;n</span>&gt; {
     <span class="kw">type </span>Item = Transition;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Transition&gt; {
         <span class="self">self</span>.range.next().map(|i| <span class="self">self</span>.node.transition(i))
     }
 }

 <span class="doccomment">/// common_idx translate a byte to an index in the COMMON_INPUTS_INV array.
 ///
 /// I wonder if it would be prudent to store this mapping in the FST itself.
 /// The advantage of doing so would mean that common inputs would reflect the
 /// specific data in the FST. The problem of course is that this table has to
 /// be computed up front, which is pretty much at odds with the streaming
 /// nature of the builder.
 ///
 /// Nevertheless, the *caller* may have a priori knowledge that could be
 /// supplied to the builder manually, which could then be embedded in the FST.
 </span><span class="attribute">#[inline(always)]
 </span><span class="kw">fn </span>common_idx(input: u8, max: u8) -&gt; u8 {
     <span class="kw">let </span>val = ((COMMON_INPUTS[input <span class="kw">as </span>usize] <span class="kw">as </span>u32 + <span class="number">1</span>) % <span class="number">256</span>) <span class="kw">as </span>u8;
     <span class="kw">if </span>val &gt; max {
         <span class="number">0
     </span>} <span class="kw">else </span>{
         val
     }
 }

 <span class="doccomment">/// common_input translates a common input index stored in a serialized FST
 /// to the corresponding byte.
 </span><span class="attribute">#[inline(always)]
 </span><span class="kw">fn </span>common_input(idx: u8) -&gt; <span class="prelude-ty">Option</span>&lt;u8&gt; {
     <span class="kw">if </span>idx == <span class="number">0 </span>{
         <span class="prelude-val">None
     </span>} <span class="kw">else </span>{
         <span class="prelude-val">Some</span>(COMMON_INPUTS_INV[(idx - <span class="number">1</span>) <span class="kw">as </span>usize])
     }
 }

 <span class="kw">fn </span>pack_delta&lt;W: io::Write&gt;(
     wtr: W,
     node_addr: CompiledAddr,
     trans_addr: CompiledAddr,
 ) -&gt; io::Result&lt;u8&gt; {
     <span class="kw">let </span>nbytes = pack_delta_size(node_addr, trans_addr);
     pack_delta_in(wtr, node_addr, trans_addr, nbytes)<span class="question-mark">?</span>;
     <span class="prelude-val">Ok</span>(nbytes)
 }

 <span class="kw">fn </span>pack_delta_in&lt;W: io::Write&gt;(
     wtr: W,
     node_addr: CompiledAddr,
     trans_addr: CompiledAddr,
     nbytes: u8,
 ) -&gt; io::Result&lt;()&gt; {
     <span class="kw">let </span>delta_addr = <span class="kw">if </span>trans_addr == EMPTY_ADDRESS {
         EMPTY_ADDRESS
     } <span class="kw">else </span>{
         node_addr - trans_addr
     };
     pack_uint_in(wtr, delta_addr <span class="kw">as </span>u64, nbytes)
 }

 <span class="kw">fn </span>pack_delta_size(node_addr: CompiledAddr, trans_addr: CompiledAddr) -&gt; u8 {
     <span class="kw">let </span>delta_addr = <span class="kw">if </span>trans_addr == EMPTY_ADDRESS {
         EMPTY_ADDRESS
     } <span class="kw">else </span>{
         node_addr - trans_addr
     };
     pack_size(delta_addr <span class="kw">as </span>u64)
 }

 <span class="attribute">#[inline(always)]
 </span><span class="kw">fn </span>unpack_delta(slice: <span class="kw-2">&amp;</span>[u8], trans_pack_size: usize, node_addr: usize) -&gt; CompiledAddr {
     <span class="kw">let </span>delta = unpack_uint(slice, trans_pack_size <span class="kw">as </span>u8);
     <span class="kw">let </span>delta_addr = u64_to_usize(delta);
     <span class="kw">if </span>delta_addr == EMPTY_ADDRESS {
         EMPTY_ADDRESS
     } <span class="kw">else </span>{
         node_addr - delta_addr
     }
 }

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>tests {
     <span class="kw">use </span>quickcheck::{quickcheck, TestResult};

     <span class="kw">use </span><span class="kw">crate</span>::raw::build::BuilderNode;
     <span class="kw">use </span><span class="kw">crate</span>::raw::node::{node_new, Node};
     <span class="kw">use </span><span class="kw">crate</span>::raw::{Builder, CompiledAddr, Fst, Output, Transition, VERSION};
     <span class="kw">use </span><span class="kw">crate</span>::stream::Streamer;

     <span class="kw">const </span>NEVER_LAST: CompiledAddr = ::std::u64::MAX <span class="kw">as </span>CompiledAddr;

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>prop_emits_inputs() {
         <span class="kw">fn </span>p(<span class="kw-2">mut </span>bs: Vec&lt;Vec&lt;u8&gt;&gt;) -&gt; TestResult {
             bs.sort();
             bs.dedup();

             <span class="kw">let </span><span class="kw-2">mut </span>bfst = Builder::memory();
             <span class="kw">for </span>word <span class="kw">in </span><span class="kw-2">&amp;</span>bs {
                 bfst.add(word).unwrap();
             }
             <span class="kw">let </span>fst = Fst::new(bfst.into_inner().unwrap()).unwrap();
             <span class="kw">let </span><span class="kw-2">mut </span>rdr = fst.stream();
             <span class="kw">let </span><span class="kw-2">mut </span>words = <span class="macro">vec!</span>[];
             <span class="kw">while let </span><span class="prelude-val">Some</span>(w) = rdr.next() {
                 words.push(w.<span class="number">0</span>.to_owned());
             }
             TestResult::from_bool(bs == words)
         }
         quickcheck(p <span class="kw">as fn</span>(Vec&lt;Vec&lt;u8&gt;&gt;) -&gt; TestResult)
     }

     <span class="kw">fn </span>nodes_equal(compiled: <span class="kw-2">&amp;</span>Node, uncompiled: <span class="kw-2">&amp;</span>BuilderNode) -&gt; bool {
         <span class="macro">println!</span>(<span class="string">&quot;{:?}&quot;</span>, compiled);
         <span class="macro">assert_eq!</span>(compiled.is_final(), uncompiled.is_final);
         <span class="macro">assert_eq!</span>(compiled.len(), uncompiled.trans.len());
         <span class="macro">assert_eq!</span>(compiled.final_output(), uncompiled.final_output);
         <span class="kw">for </span>(ct, ut) <span class="kw">in </span>compiled.transitions().zip(uncompiled.trans.iter().cloned()) {
             <span class="macro">assert_eq!</span>(ct.inp, ut.inp);
             <span class="macro">assert_eq!</span>(ct.out, ut.out);
             <span class="macro">assert_eq!</span>(ct.addr, ut.addr);
         }
         <span class="bool-val">true
     </span>}

     <span class="kw">fn </span>compile(node: <span class="kw-2">&amp;</span>BuilderNode) -&gt; (CompiledAddr, Vec&lt;u8&gt;) {
         <span class="kw">let </span><span class="kw-2">mut </span>buf = <span class="macro">vec!</span>[<span class="number">0</span>; <span class="number">24</span>];
         node.compile_to(<span class="kw-2">&amp;mut </span>buf, NEVER_LAST, <span class="number">24</span>).unwrap();
         (buf.len() <span class="kw">as </span>CompiledAddr - <span class="number">1</span>, buf)
     }

     <span class="kw">fn </span>roundtrip(bnode: <span class="kw-2">&amp;</span>BuilderNode) -&gt; bool {
         <span class="kw">let </span>(addr, bytes) = compile(bnode);
         <span class="kw">let </span>node = node_new(VERSION, addr, <span class="kw-2">&amp;</span>bytes);
         nodes_equal(<span class="kw-2">&amp;</span>node, <span class="kw-2">&amp;</span>bnode)
     }

     <span class="kw">fn </span>trans(addr: CompiledAddr, inp: u8) -&gt; Transition {
         Transition {
             inp,
             out: Output::zero(),
             addr,
         }
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>bin_no_trans() {
         <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>[],
         };
         <span class="kw">let </span>(addr, buf) = compile(<span class="kw-2">&amp;</span>bnode);
         <span class="kw">let </span>node = node_new(VERSION, addr, <span class="kw-2">&amp;</span>buf);
         <span class="macro">assert_eq!</span>(node.as_slice().len(), <span class="number">3</span>);
         roundtrip(<span class="kw-2">&amp;</span>bnode);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>bin_one_trans_common() {
         <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>[trans(<span class="number">20</span>, <span class="string">b&#39;a&#39;</span>)],
         };
         <span class="kw">let </span>(addr, buf) = compile(<span class="kw-2">&amp;</span>bnode);
         <span class="kw">let </span>node = node_new(VERSION, addr, <span class="kw-2">&amp;</span>buf);
         <span class="macro">assert_eq!</span>(node.as_slice().len(), <span class="number">3</span>);
         roundtrip(<span class="kw-2">&amp;</span>bnode);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>bin_one_trans_not_common() {
         <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>[trans(<span class="number">2</span>, <span class="string">b&#39;\xff&#39;</span>)],
         };
         <span class="kw">let </span>(addr, buf) = compile(<span class="kw-2">&amp;</span>bnode);
         <span class="kw">let </span>node = node_new(VERSION, addr, <span class="kw-2">&amp;</span>buf);
         <span class="macro">assert_eq!</span>(node.as_slice().len(), <span class="number">4</span>);
         roundtrip(<span class="kw-2">&amp;</span>bnode);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>bin_many_trans() {
         <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>[
                 trans(<span class="number">2</span>, <span class="string">b&#39;a&#39;</span>),
                 trans(<span class="number">3</span>, <span class="string">b&#39;b&#39;</span>),
                 trans(<span class="number">4</span>, <span class="string">b&#39;c&#39;</span>),
                 trans(<span class="number">5</span>, <span class="string">b&#39;d&#39;</span>),
                 trans(<span class="number">6</span>, <span class="string">b&#39;e&#39;</span>),
                 trans(<span class="number">7</span>, <span class="string">b&#39;f&#39;</span>),
             ],
         };
         <span class="kw">let </span>(addr, buf) = compile(<span class="kw-2">&amp;</span>bnode);
         <span class="kw">let </span>node = node_new(VERSION, addr, <span class="kw-2">&amp;</span>buf);
         <span class="macro">assert_eq!</span>(node.as_slice().len(), <span class="number">14</span>);
         roundtrip(<span class="kw-2">&amp;</span>bnode);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>node_max_trans() {
         <span class="kw">let </span>bnode = BuilderNode {
             is_final: <span class="bool-val">false</span>,
             final_output: Output::zero(),
             trans: (<span class="number">0</span>..<span class="number">256</span>).map(|i| trans(<span class="number">0</span>, i <span class="kw">as </span>u8)).collect(),
         };
         <span class="kw">let </span>(addr, buf) = compile(<span class="kw-2">&amp;</span>bnode);
         <span class="kw">let </span>node = node_new(VERSION, addr, <span class="kw-2">&amp;</span>buf);
         <span class="macro">assert_eq!</span>(node.transitions().count(), <span class="number">256</span>);
         <span class="macro">assert_eq!</span>(node.len(), node.transitions().count());
         roundtrip(<span class="kw-2">&amp;</span>bnode);
     }
 }
 </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>