| <!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/ops.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>ops.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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| <span id="726">726</span> |
| <span id="727">727</span> |
| <span id="728">728</span> |
| <span id="729">729</span> |
| </pre><pre class="rust"><code><span class="kw">use </span>std::cmp; |
| <span class="kw">use </span>std::collections::BinaryHeap; |
| <span class="kw">use </span>std::iter::FromIterator; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::raw::Output; |
| <span class="kw">use </span><span class="kw">crate</span>::stream::{IntoStreamer, Streamer}; |
| |
| <span class="doccomment">/// Permits stream operations to be hetergeneous with respect to streams. |
| </span><span class="kw">type </span>BoxedStream<<span class="lifetime">'f</span>> = Box<<span class="kw">dyn for</span><<span class="lifetime">'a</span>> Streamer<<span class="lifetime">'a</span>, Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], Output)> + <span class="lifetime">'f</span>>; |
| |
| <span class="doccomment">/// A value indexed by a stream. |
| /// |
| /// Indexed values are used to indicate the presence of a key in multiple |
| /// streams during a set operation. Namely, the index corresponds to the stream |
| /// (by the order in which it was added to the operation, starting at `0`) |
| /// and the value corresponds to the value associated with a particular key |
| /// in that stream. |
| </span><span class="attribute">#[derive(Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)] |
| </span><span class="kw">pub struct </span>IndexedValue { |
| <span class="doccomment">/// The index of the stream that produced this value (starting at `0`). |
| </span><span class="kw">pub </span>index: usize, |
| <span class="doccomment">/// The value. |
| </span><span class="kw">pub </span>value: u64, |
| } |
| |
| <span class="doccomment">/// A builder for collecting fst streams on which to perform set operations |
| /// on the keys of fsts. |
| /// |
| /// Set operations include intersection, union, difference and symmetric |
| /// difference. The result of each set operation is itself a stream that emits |
| /// pairs of keys and a sequence of each occurrence of that key in the |
| /// participating streams. This information allows one to perform set |
| /// operations on fsts and customize how conflicting output values are handled. |
| /// |
| /// All set operations work efficiently on an arbitrary number of |
| /// streams with memory proportional to the number of streams. |
| /// |
| /// The algorithmic complexity of all set operations is `O(n1 + n2 + n3 + ...)` |
| /// where `n1, n2, n3, ...` correspond to the number of elements in each |
| /// stream. |
| /// |
| /// The `'f` lifetime parameter refers to the lifetime of the underlying set. |
| </span><span class="kw">pub struct </span>OpBuilder<<span class="lifetime">'f</span>> { |
| streams: Vec<BoxedStream<<span class="lifetime">'f</span>>>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'f</span>> Default <span class="kw">for </span>OpBuilder<<span class="lifetime">'f</span>> { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| OpBuilder { streams: <span class="macro">vec!</span>[] } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'f</span>> OpBuilder<<span class="lifetime">'f</span>> { |
| <span class="doccomment">/// Add a stream to this set operation. |
| /// |
| /// This is useful for a chaining style pattern, e.g., |
| /// `builder.add(stream1).add(stream2).union()`. |
| /// |
| /// The stream must emit a lexicographically ordered sequence of key-value |
| /// pairs. |
| </span><span class="kw">pub fn </span>add<I, S>(<span class="kw-2">mut </span><span class="self">self</span>, stream: I) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>I: <span class="kw">for</span><<span class="lifetime">'a</span>> IntoStreamer<<span class="lifetime">'a</span>, Into = S, Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], Output)>, |
| S: <span class="lifetime">'f </span>+ <span class="kw">for</span><<span class="lifetime">'a</span>> Streamer<<span class="lifetime">'a</span>, Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], Output)>, |
| { |
| <span class="self">self</span>.push(stream); |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Add a stream to this set operation. |
| /// |
| /// The stream must emit a lexicographically ordered sequence of key-value |
| /// pairs. |
| </span><span class="kw">pub fn </span>push<I, S>(<span class="kw-2">&mut </span><span class="self">self</span>, stream: I) |
| <span class="kw">where |
| </span>I: <span class="kw">for</span><<span class="lifetime">'a</span>> IntoStreamer<<span class="lifetime">'a</span>, Into = S, Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], Output)>, |
| S: <span class="lifetime">'f </span>+ <span class="kw">for</span><<span class="lifetime">'a</span>> Streamer<<span class="lifetime">'a</span>, Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], Output)>, |
| { |
| <span class="self">self</span>.streams.push(Box::new(stream.into_stream())); |
| } |
| |
| <span class="doccomment">/// Performs a chain operation on all streams that have been added. |
| /// |
| /// Panics when no streams have been added. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>chain(<span class="self">self</span>) -> Chain<<span class="lifetime">'f</span>> { |
| Chain::new(<span class="self">self</span>.streams) |
| } |
| <span class="doccomment">/// Performs a union operation on all streams that have been added. |
| /// |
| /// Note that this returns a stream of `(&[u8], &[IndexedValue])`. The |
| /// first element of the tuple is the byte string key. The second element |
| /// of the tuple is a list of all occurrences of that key in participating |
| /// streams. The `IndexedValue` contains an index and the value associated |
| /// with that key in that stream. The index uniquely identifies each |
| /// stream, which is an integer that is auto-incremented when a stream |
| /// is added to this operation (starting at `0`). |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>union(<span class="self">self</span>) -> Union<<span class="lifetime">'f</span>> { |
| Union { |
| heap: StreamHeap::new(<span class="self">self</span>.streams), |
| outs: <span class="macro">vec!</span>[], |
| cur_slot: <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Performs an intersection operation on all streams that have been added. |
| /// |
| /// Note that this returns a stream of `(&[u8], &[IndexedValue])`. The |
| /// first element of the tuple is the byte string key. The second element |
| /// of the tuple is a list of all occurrences of that key in participating |
| /// streams. The `IndexedValue` contains an index and the value associated |
| /// with that key in that stream. The index uniquely identifies each |
| /// stream, which is an integer that is auto-incremented when a stream |
| /// is added to this operation (starting at `0`). |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>intersection(<span class="self">self</span>) -> Intersection<<span class="lifetime">'f</span>> { |
| Intersection { |
| heap: StreamHeap::new(<span class="self">self</span>.streams), |
| outs: <span class="macro">vec!</span>[], |
| cur_slot: <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Performs a difference operation with respect to the first stream added. |
| /// That is, this returns a stream of all elements in the first stream |
| /// that don't exist in any other stream that has been added. |
| /// |
| /// Note that this returns a stream of `(&[u8], &[IndexedValue])`. The |
| /// first element of the tuple is the byte string key. The second element |
| /// of the tuple is a list of all occurrences of that key in participating |
| /// streams. The `IndexedValue` contains an index and the value associated |
| /// with that key in that stream. The index uniquely identifies each |
| /// stream, which is an integer that is auto-incremented when a stream |
| /// is added to this operation (starting at `0`). |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>difference(<span class="kw-2">mut </span><span class="self">self</span>) -> Difference<<span class="lifetime">'f</span>> { |
| <span class="kw">let </span>first = <span class="self">self</span>.streams.swap_remove(<span class="number">0</span>); |
| Difference { |
| set: first, |
| key: <span class="macro">vec!</span>[], |
| heap: StreamHeap::new(<span class="self">self</span>.streams), |
| outs: <span class="macro">vec!</span>[], |
| } |
| } |
| |
| <span class="doccomment">/// Performs a symmetric difference operation on all of the streams that |
| /// have been added. |
| /// |
| /// When there are only two streams, then the keys returned correspond to |
| /// keys that are in either stream but *not* in both streams. |
| /// |
| /// More generally, for any number of streams, keys that occur in an odd |
| /// number of streams are returned. |
| /// |
| /// Note that this returns a stream of `(&[u8], &[IndexedValue])`. The |
| /// first element of the tuple is the byte string key. The second element |
| /// of the tuple is a list of all occurrences of that key in participating |
| /// streams. The `IndexedValue` contains an index and the value associated |
| /// with that key in that stream. The index uniquely identifies each |
| /// stream, which is an integer that is auto-incremented when a stream |
| /// is added to this operation (starting at `0`). |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>symmetric_difference(<span class="self">self</span>) -> SymmetricDifference<<span class="lifetime">'f</span>> { |
| SymmetricDifference { |
| heap: StreamHeap::new(<span class="self">self</span>.streams), |
| outs: <span class="macro">vec!</span>[], |
| cur_slot: <span class="prelude-val">None</span>, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'f</span>, I, S> Extend<I> <span class="kw">for </span>OpBuilder<<span class="lifetime">'f</span>> |
| <span class="kw">where |
| </span>I: <span class="kw">for</span><<span class="lifetime">'a</span>> IntoStreamer<<span class="lifetime">'a</span>, Into = S, Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], Output)>, |
| S: <span class="lifetime">'f </span>+ <span class="kw">for</span><<span class="lifetime">'a</span>> Streamer<<span class="lifetime">'a</span>, Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], Output)>, |
| { |
| <span class="kw">fn </span>extend<T>(<span class="kw-2">&mut </span><span class="self">self</span>, it: T) |
| <span class="kw">where |
| </span>T: IntoIterator<Item = I>, |
| { |
| <span class="kw">for </span>stream <span class="kw">in </span>it { |
| <span class="self">self</span>.push(stream); |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'f</span>, I, S> FromIterator<I> <span class="kw">for </span>OpBuilder<<span class="lifetime">'f</span>> |
| <span class="kw">where |
| </span>I: <span class="kw">for</span><<span class="lifetime">'a</span>> IntoStreamer<<span class="lifetime">'a</span>, Into = S, Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], Output)>, |
| S: <span class="lifetime">'f </span>+ <span class="kw">for</span><<span class="lifetime">'a</span>> Streamer<<span class="lifetime">'a</span>, Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], Output)>, |
| { |
| <span class="kw">fn </span>from_iter<T>(it: T) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>T: IntoIterator<Item = I>, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>op = OpBuilder::default(); |
| op.extend(it); |
| op |
| } |
| } |
| |
| <span class="doccomment">/// A stream of chaining multiple fst streams in added order. |
| /// |
| /// The `'f` lifetime parameter refers to the lifetime of the underlying map. |
| </span><span class="kw">pub struct </span>Chain<<span class="lifetime">'f</span>> { |
| streams: Vec<BoxedStream<<span class="lifetime">'f</span>>>, |
| current_stream: BoxedStream<<span class="lifetime">'f</span>>, |
| key: Vec<u8>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'f</span>> Chain<<span class="lifetime">'f</span>> { |
| <span class="doccomment">/// Creates a new Chain. panics when streams is empty |
| </span><span class="kw">fn </span>new(<span class="kw-2">mut </span>streams: Vec<BoxedStream<<span class="lifetime">'f</span>>>) -> <span class="self">Self </span>{ |
| streams.reverse(); |
| |
| <span class="kw">let </span>current_stream = streams.pop().unwrap(); |
| Chain { |
| streams, |
| current_stream, |
| key: <span class="macro">vec!</span>[], |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, <span class="lifetime">'f</span>> Streamer<<span class="lifetime">'a</span>> <span class="kw">for </span>Chain<<span class="lifetime">'f</span>> { |
| <span class="kw">type </span>Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], Output); |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">loop </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((key, val)) = <span class="self">self</span>.current_stream.next() { |
| <span class="self">self</span>.key.clear(); |
| <span class="self">self</span>.key.extend_from_slice(<span class="kw-2">&</span>key); |
| <span class="kw">return </span><span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="self">self</span>.key, val)); |
| } <span class="kw">else </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(next_stream) = <span class="self">self</span>.streams.pop() { |
| <span class="self">self</span>.current_stream = next_stream; |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// A stream of set union over multiple fst streams in lexicographic order. |
| /// |
| /// The `'f` lifetime parameter refers to the lifetime of the underlying map. |
| </span><span class="kw">pub struct </span>Union<<span class="lifetime">'f</span>> { |
| heap: StreamHeap<<span class="lifetime">'f</span>>, |
| outs: Vec<IndexedValue>, |
| cur_slot: <span class="prelude-ty">Option</span><Slot>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, <span class="lifetime">'f</span>> Streamer<<span class="lifetime">'a</span>> <span class="kw">for </span>Union<<span class="lifetime">'f</span>> { |
| <span class="kw">type </span>Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], <span class="kw-2">&</span><span class="lifetime">'a </span>[IndexedValue]); |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(slot) = <span class="self">self</span>.cur_slot.take() { |
| <span class="self">self</span>.heap.refill(slot); |
| } |
| <span class="kw">let </span>slot = <span class="kw">match </span><span class="self">self</span>.heap.pop() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(slot) => { |
| <span class="self">self</span>.cur_slot = <span class="prelude-val">Some</span>(slot); |
| <span class="self">self</span>.cur_slot.as_ref().unwrap() |
| } |
| }; |
| <span class="self">self</span>.outs.clear(); |
| <span class="self">self</span>.outs.push(slot.indexed_value()); |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(slot2) = <span class="self">self</span>.heap.pop_if_equal(slot.input()) { |
| <span class="self">self</span>.outs.push(slot2.indexed_value()); |
| <span class="self">self</span>.heap.refill(slot2); |
| } |
| <span class="prelude-val">Some</span>((slot.input(), <span class="kw-2">&</span><span class="self">self</span>.outs)) |
| } |
| } |
| |
| <span class="doccomment">/// A stream of set intersection over multiple fst streams in lexicographic |
| /// order. |
| /// |
| /// The `'f` lifetime parameter refers to the lifetime of the underlying fst. |
| </span><span class="kw">pub struct </span>Intersection<<span class="lifetime">'f</span>> { |
| heap: StreamHeap<<span class="lifetime">'f</span>>, |
| outs: Vec<IndexedValue>, |
| cur_slot: <span class="prelude-ty">Option</span><Slot>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, <span class="lifetime">'f</span>> Streamer<<span class="lifetime">'a</span>> <span class="kw">for </span>Intersection<<span class="lifetime">'f</span>> { |
| <span class="kw">type </span>Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], <span class="kw-2">&</span><span class="lifetime">'a </span>[IndexedValue]); |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(slot) = <span class="self">self</span>.cur_slot.take() { |
| <span class="self">self</span>.heap.refill(slot); |
| } |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>slot = <span class="kw">match </span><span class="self">self</span>.heap.pop() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(slot) => slot, |
| }; |
| <span class="self">self</span>.outs.clear(); |
| <span class="self">self</span>.outs.push(slot.indexed_value()); |
| <span class="kw">let </span><span class="kw-2">mut </span>popped: usize = <span class="number">1</span>; |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(slot2) = <span class="self">self</span>.heap.pop_if_equal(slot.input()) { |
| <span class="self">self</span>.outs.push(slot2.indexed_value()); |
| <span class="self">self</span>.heap.refill(slot2); |
| popped += <span class="number">1</span>; |
| } |
| <span class="kw">if </span>popped < <span class="self">self</span>.heap.num_slots() { |
| <span class="self">self</span>.heap.refill(slot); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.cur_slot = <span class="prelude-val">Some</span>(slot); |
| <span class="kw">let </span>key = <span class="self">self</span>.cur_slot.as_ref().unwrap().input(); |
| <span class="kw">return </span><span class="prelude-val">Some</span>((key, <span class="kw-2">&</span><span class="self">self</span>.outs)); |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// A stream of set difference over multiple fst streams in lexicographic |
| /// order. |
| /// |
| /// The difference operation is taken with respect to the first stream and the |
| /// rest of the streams. i.e., All elements in the first stream that do not |
| /// appear in any other streams. |
| /// |
| /// The `'f` lifetime parameter refers to the lifetime of the underlying fst. |
| </span><span class="kw">pub struct </span>Difference<<span class="lifetime">'f</span>> { |
| set: BoxedStream<<span class="lifetime">'f</span>>, |
| key: Vec<u8>, |
| heap: StreamHeap<<span class="lifetime">'f</span>>, |
| outs: Vec<IndexedValue>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, <span class="lifetime">'f</span>> Streamer<<span class="lifetime">'a</span>> <span class="kw">for </span>Difference<<span class="lifetime">'f</span>> { |
| <span class="kw">type </span>Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], <span class="kw-2">&</span><span class="lifetime">'a </span>[IndexedValue]); |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">loop </span>{ |
| <span class="kw">match </span><span class="self">self</span>.set.next() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>((key, out)) => { |
| <span class="self">self</span>.key.clear(); |
| <span class="self">self</span>.key.extend(key); |
| <span class="self">self</span>.outs.clear(); |
| <span class="self">self</span>.outs.push(IndexedValue { |
| index: <span class="number">0</span>, |
| value: out.value(), |
| }); |
| } |
| }; |
| <span class="kw">let </span><span class="kw-2">mut </span>unique = <span class="bool-val">true</span>; |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(slot) = <span class="self">self</span>.heap.pop_if_le(<span class="kw-2">&</span><span class="self">self</span>.key) { |
| <span class="kw">if </span>slot.input() == <span class="kw-2">&*</span><span class="self">self</span>.key { |
| unique = <span class="bool-val">false</span>; |
| } |
| <span class="self">self</span>.heap.refill(slot); |
| } |
| <span class="kw">if </span>unique { |
| <span class="kw">return </span><span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="self">self</span>.key, <span class="kw-2">&</span><span class="self">self</span>.outs)); |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// A stream of set symmetric difference over multiple fst streams in |
| /// lexicographic order. |
| /// |
| /// The `'f` lifetime parameter refers to the lifetime of the underlying fst. |
| </span><span class="kw">pub struct </span>SymmetricDifference<<span class="lifetime">'f</span>> { |
| heap: StreamHeap<<span class="lifetime">'f</span>>, |
| outs: Vec<IndexedValue>, |
| cur_slot: <span class="prelude-ty">Option</span><Slot>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, <span class="lifetime">'f</span>> Streamer<<span class="lifetime">'a</span>> <span class="kw">for </span>SymmetricDifference<<span class="lifetime">'f</span>> { |
| <span class="kw">type </span>Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], <span class="kw-2">&</span><span class="lifetime">'a </span>[IndexedValue]); |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(slot) = <span class="self">self</span>.cur_slot.take() { |
| <span class="self">self</span>.heap.refill(slot); |
| } |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>slot = <span class="kw">match </span><span class="self">self</span>.heap.pop() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(slot) => slot, |
| }; |
| <span class="self">self</span>.outs.clear(); |
| <span class="self">self</span>.outs.push(slot.indexed_value()); |
| <span class="kw">let </span><span class="kw-2">mut </span>popped: usize = <span class="number">1</span>; |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(slot2) = <span class="self">self</span>.heap.pop_if_equal(slot.input()) { |
| <span class="self">self</span>.outs.push(slot2.indexed_value()); |
| <span class="self">self</span>.heap.refill(slot2); |
| popped += <span class="number">1</span>; |
| } |
| <span class="comment">// This key is in the symmetric difference if and only if it |
| // appears in an odd number of sets. |
| </span><span class="kw">if </span>popped % <span class="number">2 </span>== <span class="number">0 </span>{ |
| <span class="self">self</span>.heap.refill(slot); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.cur_slot = <span class="prelude-val">Some</span>(slot); |
| <span class="kw">let </span>key = <span class="self">self</span>.cur_slot.as_ref().unwrap().input(); |
| <span class="kw">return </span><span class="prelude-val">Some</span>((key, <span class="kw-2">&</span><span class="self">self</span>.outs)); |
| } |
| } |
| } |
| } |
| |
| <span class="kw">struct </span>StreamHeap<<span class="lifetime">'f</span>> { |
| rdrs: Vec<BoxedStream<<span class="lifetime">'f</span>>>, |
| heap: BinaryHeap<Slot>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'f</span>> StreamHeap<<span class="lifetime">'f</span>> { |
| <span class="kw">fn </span>new(streams: Vec<BoxedStream<<span class="lifetime">'f</span>>>) -> StreamHeap<<span class="lifetime">'f</span>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>u = StreamHeap { |
| rdrs: streams, |
| heap: BinaryHeap::new(), |
| }; |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..u.rdrs.len() { |
| u.refill(Slot::new(i)); |
| } |
| u |
| } |
| |
| <span class="kw">fn </span>pop(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Slot> { |
| <span class="self">self</span>.heap.pop() |
| } |
| |
| <span class="kw">fn </span>peek_is_duplicate(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>[u8]) -> bool { |
| <span class="self">self</span>.heap.peek().map(|s| s.input() == key).unwrap_or(<span class="bool-val">false</span>) |
| } |
| |
| <span class="kw">fn </span>pop_if_equal(<span class="kw-2">&mut </span><span class="self">self</span>, key: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><Slot> { |
| <span class="kw">if </span><span class="self">self</span>.peek_is_duplicate(key) { |
| <span class="self">self</span>.pop() |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="kw">fn </span>pop_if_le(<span class="kw-2">&mut </span><span class="self">self</span>, key: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><Slot> { |
| <span class="kw">if </span><span class="self">self</span>.heap.peek().map(|s| s.input() <= key).unwrap_or(<span class="bool-val">false</span>) { |
| <span class="self">self</span>.pop() |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="kw">fn </span>num_slots(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.rdrs.len() |
| } |
| |
| <span class="kw">fn </span>refill(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>slot: Slot) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((input, output)) = <span class="self">self</span>.rdrs[slot.idx].next() { |
| slot.set_input(input); |
| slot.set_output(output); |
| <span class="self">self</span>.heap.push(slot); |
| } |
| } |
| } |
| |
| <span class="attribute">#[derive(Debug, Eq, PartialEq)] |
| </span><span class="kw">struct </span>Slot { |
| idx: usize, |
| input: Vec<u8>, |
| output: Output, |
| } |
| |
| <span class="kw">impl </span>Slot { |
| <span class="kw">fn </span>new(rdr_idx: usize) -> Slot { |
| Slot { |
| idx: rdr_idx, |
| input: Vec::with_capacity(<span class="number">64</span>), |
| output: Output::zero(), |
| } |
| } |
| |
| <span class="kw">fn </span>indexed_value(<span class="kw-2">&</span><span class="self">self</span>) -> IndexedValue { |
| IndexedValue { |
| index: <span class="self">self</span>.idx, |
| value: <span class="self">self</span>.output.value(), |
| } |
| } |
| |
| <span class="kw">fn </span>input(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] { |
| <span class="kw-2">&</span><span class="self">self</span>.input |
| } |
| |
| <span class="kw">fn </span>set_input(<span class="kw-2">&mut </span><span class="self">self</span>, input: <span class="kw-2">&</span>[u8]) { |
| <span class="self">self</span>.input.clear(); |
| <span class="self">self</span>.input.extend(input); |
| } |
| |
| <span class="kw">fn </span>set_output(<span class="kw-2">&mut </span><span class="self">self</span>, output: Output) { |
| <span class="self">self</span>.output = output; |
| } |
| } |
| |
| <span class="kw">impl </span>PartialOrd <span class="kw">for </span>Slot { |
| <span class="kw">fn </span>partial_cmp(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Slot) -> <span class="prelude-ty">Option</span><cmp::Ordering> { |
| (<span class="kw-2">&</span><span class="self">self</span>.input, <span class="self">self</span>.output) |
| .partial_cmp(<span class="kw-2">&</span>(<span class="kw-2">&</span>other.input, other.output)) |
| .map(|ord| ord.reverse()) |
| } |
| } |
| |
| <span class="kw">impl </span>Ord <span class="kw">for </span>Slot { |
| <span class="kw">fn </span>cmp(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Slot) -> cmp::Ordering { |
| <span class="self">self</span>.partial_cmp(other).unwrap() |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span><span class="kw">crate</span>::raw::tests::{fst_map, fst_set}; |
| <span class="kw">use </span><span class="kw">crate</span>::raw::Fst; |
| <span class="kw">use </span><span class="kw">crate</span>::raw::Output; |
| <span class="kw">use </span><span class="kw">crate</span>::stream::{IntoStreamer, Streamer}; |
| |
| <span class="kw">use </span><span class="kw">super</span>::OpBuilder; |
| |
| <span class="kw">fn </span>s(string: <span class="kw-2">&</span>str) -> String { |
| string.to_owned() |
| } |
| |
| <span class="macro">macro_rules! </span>create_set_op { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$op</span>:ident) => { |
| <span class="kw">fn </span><span class="macro-nonterminal">$name</span>(sets: Vec<Vec<<span class="kw-2">&</span>str>>) -> Vec<String> { |
| <span class="kw">let </span>fsts: Vec<Fst> = sets.into_iter().map(fst_set).collect(); |
| <span class="kw">let </span>op: OpBuilder = fsts.iter().collect(); |
| <span class="kw">let </span><span class="kw-2">mut </span>stream = op.<span class="macro-nonterminal">$op</span>().into_stream(); |
| <span class="kw">let </span><span class="kw-2">mut </span>keys = <span class="macro">vec!</span>[]; |
| <span class="kw">while let </span><span class="prelude-val">Some</span>((key, <span class="kw">_</span>)) = stream.next() { |
| keys.push(String::from_utf8(key.to_vec()).unwrap()); |
| } |
| keys |
| } |
| }; |
| } |
| |
| <span class="macro">macro_rules! </span>create_map_op { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$op</span>:ident) => { |
| <span class="kw">fn </span><span class="macro-nonterminal">$name</span>(sets: Vec<Vec<(<span class="kw-2">&</span>str, u64)>>) -> Vec<(String, u64)> { |
| <span class="kw">let </span>fsts: Vec<Fst> = sets.into_iter().map(fst_map).collect(); |
| <span class="kw">let </span>op: OpBuilder = fsts.iter().collect(); |
| <span class="kw">let </span><span class="kw-2">mut </span>stream = op.<span class="macro-nonterminal">$op</span>().into_stream(); |
| <span class="kw">let </span><span class="kw-2">mut </span>keys = <span class="macro">vec!</span>[]; |
| <span class="kw">while let </span><span class="prelude-val">Some</span>((key, outs)) = stream.next() { |
| <span class="kw">let </span>merged = outs.iter().fold(<span class="number">0</span>, |a, b| a + b.value); |
| <span class="kw">let </span>s = String::from_utf8(key.to_vec()).unwrap(); |
| keys.push((s, merged)); |
| } |
| keys |
| } |
| }; |
| } |
| |
| <span class="macro">macro_rules! </span>create_map_op_chain { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$op</span>:ident) => { |
| <span class="kw">fn </span><span class="macro-nonterminal">$name</span>(sets: Vec<Vec<(<span class="kw-2">&</span>str, u64)>>) -> Vec<(String, Output)> { |
| <span class="kw">let </span>fsts: Vec<Fst> = sets.into_iter().map(fst_map).collect(); |
| <span class="kw">let </span>op: OpBuilder = fsts.iter().collect(); |
| <span class="kw">let </span><span class="kw-2">mut </span>stream = op.<span class="macro-nonterminal">$op</span>().into_stream(); |
| <span class="kw">let </span><span class="kw-2">mut </span>keys = <span class="macro">vec!</span>[]; |
| <span class="kw">while let </span><span class="prelude-val">Some</span>((key, outs)) = stream.next() { |
| <span class="kw">let </span>s = String::from_utf8(key.to_vec()).unwrap(); |
| keys.push((s, outs)); |
| } |
| keys |
| } |
| }; |
| } |
| <span class="macro">create_set_op!</span>(fst_union, union); |
| <span class="macro">create_set_op!</span>(fst_intersection, intersection); |
| <span class="macro">create_set_op!</span>(fst_symmetric_difference, symmetric_difference); |
| <span class="macro">create_set_op!</span>(fst_difference, difference); |
| <span class="macro">create_set_op!</span>(fst_chain, chain); |
| <span class="macro">create_map_op!</span>(fst_union_map, union); |
| <span class="macro">create_map_op!</span>(fst_intersection_map, intersection); |
| <span class="macro">create_map_op!</span>(fst_symmetric_difference_map, symmetric_difference); |
| <span class="macro">create_map_op!</span>(fst_difference_map, difference); |
| <span class="macro">create_map_op_chain!</span>(fst_chain_map, chain); |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>chain_set() { |
| <span class="kw">let </span>v = fst_chain(<span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>], <span class="macro">vec!</span>[<span class="string">"x"</span>, <span class="string">"y"</span>, <span class="string">"z"</span>]]); |
| <span class="macro">assert_eq!</span>(v, <span class="macro">vec!</span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>, <span class="string">"x"</span>, <span class="string">"y"</span>, <span class="string">"z"</span>]); |
| } |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>chain_set_wrong_order() { |
| <span class="comment">// Chaining doesn't care about order |
| </span><span class="kw">let </span>v = fst_chain(<span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>, <span class="string">"z"</span>], <span class="macro">vec!</span>[<span class="string">"x"</span>, <span class="string">"y"</span>, <span class="string">"z"</span>]]); |
| <span class="macro">assert_eq!</span>(v, <span class="macro">vec!</span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>, <span class="string">"z"</span>, <span class="string">"x"</span>, <span class="string">"y"</span>, <span class="string">"z"</span>]); |
| } |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>chain_map() { |
| <span class="kw">let </span>v = fst_chain_map(<span class="macro">vec!</span>[ |
| <span class="macro">vec!</span>[(<span class="string">"a"</span>, <span class="number">1</span>), (<span class="string">"b"</span>, <span class="number">2</span>), (<span class="string">"c"</span>, <span class="number">3</span>)], |
| <span class="macro">vec!</span>[(<span class="string">"x"</span>, <span class="number">1</span>), (<span class="string">"y"</span>, <span class="number">2</span>), (<span class="string">"z"</span>, <span class="number">3</span>)], |
| ]); |
| <span class="macro">assert_eq!</span>( |
| v, |
| <span class="macro">vec!</span>[ |
| (s(<span class="string">"a"</span>), Output::new(<span class="number">1</span>)), |
| (s(<span class="string">"b"</span>), Output::new(<span class="number">2</span>)), |
| (s(<span class="string">"c"</span>), Output::new(<span class="number">3</span>)), |
| (s(<span class="string">"x"</span>), Output::new(<span class="number">1</span>)), |
| (s(<span class="string">"y"</span>), Output::new(<span class="number">2</span>)), |
| (s(<span class="string">"z"</span>), Output::new(<span class="number">3</span>)), |
| ] |
| ); |
| } |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>union_set() { |
| <span class="kw">let </span>v = fst_union(<span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>], <span class="macro">vec!</span>[<span class="string">"x"</span>, <span class="string">"y"</span>, <span class="string">"z"</span>]]); |
| <span class="macro">assert_eq!</span>(v, <span class="macro">vec!</span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>, <span class="string">"x"</span>, <span class="string">"y"</span>, <span class="string">"z"</span>]); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>union_set_dupes() { |
| <span class="kw">let </span>v = fst_union(<span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="string">"aa"</span>, <span class="string">"b"</span>, <span class="string">"cc"</span>], <span class="macro">vec!</span>[<span class="string">"b"</span>, <span class="string">"cc"</span>, <span class="string">"z"</span>]]); |
| <span class="macro">assert_eq!</span>(v, <span class="macro">vec!</span>[<span class="string">"aa"</span>, <span class="string">"b"</span>, <span class="string">"cc"</span>, <span class="string">"z"</span>]); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>union_map() { |
| <span class="kw">let </span>v = fst_union_map(<span class="macro">vec!</span>[ |
| <span class="macro">vec!</span>[(<span class="string">"a"</span>, <span class="number">1</span>), (<span class="string">"b"</span>, <span class="number">2</span>), (<span class="string">"c"</span>, <span class="number">3</span>)], |
| <span class="macro">vec!</span>[(<span class="string">"x"</span>, <span class="number">1</span>), (<span class="string">"y"</span>, <span class="number">2</span>), (<span class="string">"z"</span>, <span class="number">3</span>)], |
| ]); |
| <span class="macro">assert_eq!</span>( |
| v, |
| <span class="macro">vec!</span>[ |
| (s(<span class="string">"a"</span>), <span class="number">1</span>), |
| (s(<span class="string">"b"</span>), <span class="number">2</span>), |
| (s(<span class="string">"c"</span>), <span class="number">3</span>), |
| (s(<span class="string">"x"</span>), <span class="number">1</span>), |
| (s(<span class="string">"y"</span>), <span class="number">2</span>), |
| (s(<span class="string">"z"</span>), <span class="number">3</span>), |
| ] |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>union_map_dupes() { |
| <span class="kw">let </span>v = fst_union_map(<span class="macro">vec!</span>[ |
| <span class="macro">vec!</span>[(<span class="string">"aa"</span>, <span class="number">1</span>), (<span class="string">"b"</span>, <span class="number">2</span>), (<span class="string">"cc"</span>, <span class="number">3</span>)], |
| <span class="macro">vec!</span>[(<span class="string">"b"</span>, <span class="number">1</span>), (<span class="string">"cc"</span>, <span class="number">2</span>), (<span class="string">"z"</span>, <span class="number">3</span>)], |
| <span class="macro">vec!</span>[(<span class="string">"b"</span>, <span class="number">1</span>)], |
| ]); |
| <span class="macro">assert_eq!</span>( |
| v, |
| <span class="macro">vec!</span>[(s(<span class="string">"aa"</span>), <span class="number">1</span>), (s(<span class="string">"b"</span>), <span class="number">4</span>), (s(<span class="string">"cc"</span>), <span class="number">5</span>), (s(<span class="string">"z"</span>), <span class="number">3</span>),] |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>intersect_set() { |
| <span class="kw">let </span>v = fst_intersection(<span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>], <span class="macro">vec!</span>[<span class="string">"x"</span>, <span class="string">"y"</span>, <span class="string">"z"</span>]]); |
| <span class="macro">assert_eq!</span>(v, Vec::<String>::new()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>intersect_set_dupes() { |
| <span class="kw">let </span>v = fst_intersection(<span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="string">"aa"</span>, <span class="string">"b"</span>, <span class="string">"cc"</span>], <span class="macro">vec!</span>[<span class="string">"b"</span>, <span class="string">"cc"</span>, <span class="string">"z"</span>]]); |
| <span class="macro">assert_eq!</span>(v, <span class="macro">vec!</span>[<span class="string">"b"</span>, <span class="string">"cc"</span>]); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>intersect_map() { |
| <span class="kw">let </span>v = fst_intersection_map(<span class="macro">vec!</span>[ |
| <span class="macro">vec!</span>[(<span class="string">"a"</span>, <span class="number">1</span>), (<span class="string">"b"</span>, <span class="number">2</span>), (<span class="string">"c"</span>, <span class="number">3</span>)], |
| <span class="macro">vec!</span>[(<span class="string">"x"</span>, <span class="number">1</span>), (<span class="string">"y"</span>, <span class="number">2</span>), (<span class="string">"z"</span>, <span class="number">3</span>)], |
| ]); |
| <span class="macro">assert_eq!</span>(v, Vec::<(String, u64)>::new()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>intersect_map_dupes() { |
| <span class="kw">let </span>v = fst_intersection_map(<span class="macro">vec!</span>[ |
| <span class="macro">vec!</span>[(<span class="string">"aa"</span>, <span class="number">1</span>), (<span class="string">"b"</span>, <span class="number">2</span>), (<span class="string">"cc"</span>, <span class="number">3</span>)], |
| <span class="macro">vec!</span>[(<span class="string">"b"</span>, <span class="number">1</span>), (<span class="string">"cc"</span>, <span class="number">2</span>), (<span class="string">"z"</span>, <span class="number">3</span>)], |
| <span class="macro">vec!</span>[(<span class="string">"b"</span>, <span class="number">1</span>)], |
| ]); |
| <span class="macro">assert_eq!</span>(v, <span class="macro">vec!</span>[(s(<span class="string">"b"</span>), <span class="number">4</span>)]); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>symmetric_difference() { |
| <span class="kw">let </span>v = fst_symmetric_difference(<span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>], <span class="macro">vec!</span>[<span class="string">"a"</span>, <span class="string">"b"</span>], <span class="macro">vec!</span>[<span class="string">"a"</span>]]); |
| <span class="macro">assert_eq!</span>(v, <span class="macro">vec!</span>[<span class="string">"a"</span>, <span class="string">"c"</span>]); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>symmetric_difference_map() { |
| <span class="kw">let </span>v = fst_symmetric_difference_map(<span class="macro">vec!</span>[ |
| <span class="macro">vec!</span>[(<span class="string">"a"</span>, <span class="number">1</span>), (<span class="string">"b"</span>, <span class="number">2</span>), (<span class="string">"c"</span>, <span class="number">3</span>)], |
| <span class="macro">vec!</span>[(<span class="string">"a"</span>, <span class="number">1</span>), (<span class="string">"b"</span>, <span class="number">2</span>)], |
| <span class="macro">vec!</span>[(<span class="string">"a"</span>, <span class="number">1</span>)], |
| ]); |
| <span class="macro">assert_eq!</span>(v, <span class="macro">vec!</span>[(s(<span class="string">"a"</span>), <span class="number">3</span>), (s(<span class="string">"c"</span>), <span class="number">3</span>)]); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>difference() { |
| <span class="kw">let </span>v = fst_difference(<span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>], <span class="macro">vec!</span>[<span class="string">"a"</span>, <span class="string">"b"</span>], <span class="macro">vec!</span>[<span class="string">"a"</span>]]); |
| <span class="macro">assert_eq!</span>(v, <span class="macro">vec!</span>[<span class="string">"c"</span>]); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>difference2() { |
| <span class="comment">// Regression test: https://github.com/BurntSushi/fst/issues/19 |
| </span><span class="kw">let </span>v = fst_difference(<span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="string">"a"</span>, <span class="string">"c"</span>], <span class="macro">vec!</span>[<span class="string">"b"</span>, <span class="string">"c"</span>]]); |
| <span class="macro">assert_eq!</span>(v, <span class="macro">vec!</span>[<span class="string">"a"</span>]); |
| <span class="kw">let </span>v = fst_difference(<span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="string">"bar"</span>, <span class="string">"foo"</span>], <span class="macro">vec!</span>[<span class="string">"baz"</span>, <span class="string">"foo"</span>]]); |
| <span class="macro">assert_eq!</span>(v, <span class="macro">vec!</span>[<span class="string">"bar"</span>]); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>difference_map() { |
| <span class="kw">let </span>v = fst_difference_map(<span class="macro">vec!</span>[ |
| <span class="macro">vec!</span>[(<span class="string">"a"</span>, <span class="number">1</span>), (<span class="string">"b"</span>, <span class="number">2</span>), (<span class="string">"c"</span>, <span class="number">3</span>)], |
| <span class="macro">vec!</span>[(<span class="string">"a"</span>, <span class="number">1</span>), (<span class="string">"b"</span>, <span class="number">2</span>)], |
| <span class="macro">vec!</span>[(<span class="string">"a"</span>, <span class="number">1</span>)], |
| ]); |
| <span class="macro">assert_eq!</span>(v, <span class="macro">vec!</span>[(s(<span class="string">"c"</span>), <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> |
