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</pre><pre class="rust"><code><span class="kw">use </span>common::{BitSet, TinySet};
<span class="kw">use </span><span class="kw">crate</span>::docset::{DocSet, TERMINATED};
<span class="kw">use </span><span class="kw">crate</span>::DocId;
<span class="doccomment">/// A `BitSetDocSet` makes it possible to iterate through a bitset as if it was a `DocSet`.
///
/// # Implementation detail
///
/// Skipping is relatively fast here as we can directly point to the
/// right tiny bitset bucket.
///
/// TODO: Consider implementing a `BitTreeSet` in order to advance faster
/// when the bitset is sparse
</span><span class="kw">pub struct </span>BitSetDocSet {
docs: BitSet,
cursor_bucket: u32, <span class="comment">//&lt; index associated with the current tiny bitset
</span>cursor_tinybitset: TinySet,
doc: u32,
}
<span class="kw">impl </span>BitSetDocSet {
<span class="kw">fn </span>go_to_bucket(<span class="kw-2">&amp;mut </span><span class="self">self</span>, bucket_addr: u32) {
<span class="self">self</span>.cursor_bucket = bucket_addr;
<span class="self">self</span>.cursor_tinybitset = <span class="self">self</span>.docs.tinyset(bucket_addr);
}
}
<span class="kw">impl </span>From&lt;BitSet&gt; <span class="kw">for </span>BitSetDocSet {
<span class="kw">fn </span>from(docs: BitSet) -&gt; BitSetDocSet {
<span class="kw">let </span>first_tiny_bitset = <span class="kw">if </span>docs.max_value() == <span class="number">0 </span>{
TinySet::empty()
} <span class="kw">else </span>{
docs.tinyset(<span class="number">0</span>)
};
<span class="kw">let </span><span class="kw-2">mut </span>docset = BitSetDocSet {
docs,
cursor_bucket: <span class="number">0</span>,
cursor_tinybitset: first_tiny_bitset,
doc: <span class="number">0u32</span>,
};
docset.advance();
docset
}
}
<span class="kw">impl </span>DocSet <span class="kw">for </span>BitSetDocSet {
<span class="kw">fn </span>advance(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; DocId {
<span class="kw">if let </span><span class="prelude-val">Some</span>(lower) = <span class="self">self</span>.cursor_tinybitset.pop_lowest() {
<span class="self">self</span>.doc = (<span class="self">self</span>.cursor_bucket <span class="kw">as </span>u32 * <span class="number">64u32</span>) | lower;
<span class="kw">return </span><span class="self">self</span>.doc;
}
<span class="kw">if let </span><span class="prelude-val">Some</span>(cursor_bucket) = <span class="self">self</span>.docs.first_non_empty_bucket(<span class="self">self</span>.cursor_bucket + <span class="number">1</span>) {
<span class="self">self</span>.go_to_bucket(cursor_bucket);
<span class="kw">let </span>lower = <span class="self">self</span>.cursor_tinybitset.pop_lowest().unwrap();
<span class="self">self</span>.doc = (cursor_bucket * <span class="number">64u32</span>) | lower;
<span class="self">self</span>.doc
} <span class="kw">else </span>{
<span class="self">self</span>.doc = TERMINATED;
TERMINATED
}
}
<span class="kw">fn </span>seek(<span class="kw-2">&amp;mut </span><span class="self">self</span>, target: DocId) -&gt; DocId {
<span class="kw">if </span>target &gt;= <span class="self">self</span>.docs.max_value() {
<span class="self">self</span>.doc = TERMINATED;
<span class="kw">return </span>TERMINATED;
}
<span class="kw">let </span>target_bucket = target / <span class="number">64u32</span>;
<span class="kw">if </span>target_bucket &gt; <span class="self">self</span>.cursor_bucket {
<span class="self">self</span>.go_to_bucket(target_bucket);
<span class="kw">let </span>greater_filter: TinySet = TinySet::range_greater_or_equal(target);
<span class="self">self</span>.cursor_tinybitset = <span class="self">self</span>.cursor_tinybitset.intersect(greater_filter);
<span class="self">self</span>.advance()
} <span class="kw">else </span>{
<span class="kw">let </span><span class="kw-2">mut </span>doc = <span class="self">self</span>.doc();
<span class="kw">while </span>doc &lt; target {
doc = <span class="self">self</span>.advance();
}
doc
}
}
<span class="doccomment">/// Returns the current document
</span><span class="kw">fn </span>doc(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; DocId {
<span class="self">self</span>.doc
}
<span class="doccomment">/// Returns the number of values set in the underlying bitset.
</span><span class="kw">fn </span>size_hint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
<span class="self">self</span>.docs.len() <span class="kw">as </span>u32
}
}
<span class="attribute">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use </span>std::collections::BTreeSet;
<span class="kw">use </span>common::BitSet;
<span class="kw">use </span><span class="kw">super</span>::BitSetDocSet;
<span class="kw">use </span><span class="kw">crate</span>::docset::{DocSet, TERMINATED};
<span class="kw">use </span><span class="kw">crate</span>::tests::generate_nonunique_unsorted;
<span class="kw">use </span><span class="kw">crate</span>::DocId;
<span class="kw">fn </span>create_docbitset(docs: <span class="kw-2">&amp;</span>[DocId], max_doc: DocId) -&gt; BitSetDocSet {
<span class="kw">let </span><span class="kw-2">mut </span>docset = BitSet::with_max_value(max_doc);
<span class="kw">for </span><span class="kw-2">&amp;</span>doc <span class="kw">in </span>docs {
docset.insert(doc);
}
BitSetDocSet::from(docset)
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_bitset_large() {
<span class="kw">let </span>arr = generate_nonunique_unsorted(<span class="number">100_000</span>, <span class="number">5_000</span>);
<span class="kw">let </span><span class="kw-2">mut </span>btreeset: BTreeSet&lt;u32&gt; = BTreeSet::new();
<span class="kw">let </span><span class="kw-2">mut </span>bitset = BitSet::with_max_value(<span class="number">100_000</span>);
<span class="kw">for </span>el <span class="kw">in </span>arr {
btreeset.insert(el);
bitset.insert(el);
}
<span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">100_000 </span>{
<span class="macro">assert_eq!</span>(btreeset.contains(<span class="kw-2">&amp;</span>i), bitset.contains(i));
}
<span class="macro">assert_eq!</span>(btreeset.len(), bitset.len());
<span class="kw">let </span><span class="kw-2">mut </span>bitset_docset = BitSetDocSet::from(bitset);
<span class="kw">let </span><span class="kw-2">mut </span>remaining = <span class="bool-val">true</span>;
<span class="kw">for </span>el <span class="kw">in </span>btreeset.into_iter() {
<span class="macro">assert!</span>(remaining);
<span class="macro">assert_eq!</span>(bitset_docset.doc(), el);
remaining = bitset_docset.advance() != TERMINATED;
}
<span class="macro">assert!</span>(!remaining);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_empty() {
<span class="kw">let </span>bitset = BitSet::with_max_value(<span class="number">1000</span>);
<span class="kw">let </span><span class="kw-2">mut </span>empty = BitSetDocSet::from(bitset);
<span class="macro">assert_eq!</span>(empty.advance(), TERMINATED)
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_seek_terminated() {
<span class="kw">let </span>bitset = BitSet::with_max_value(<span class="number">1000</span>);
<span class="kw">let </span><span class="kw-2">mut </span>empty = BitSetDocSet::from(bitset);
<span class="macro">assert_eq!</span>(empty.seek(TERMINATED), TERMINATED)
}
<span class="kw">fn </span>test_go_through_sequential(docs: <span class="kw-2">&amp;</span>[DocId]) {
<span class="kw">let </span><span class="kw-2">mut </span>docset = create_docbitset(docs, <span class="number">1_000u32</span>);
<span class="kw">for </span><span class="kw-2">&amp;</span>doc <span class="kw">in </span>docs {
<span class="macro">assert_eq!</span>(doc, docset.doc());
docset.advance();
}
<span class="macro">assert_eq!</span>(docset.advance(), TERMINATED);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_docbitset_sequential() {
test_go_through_sequential(<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);
test_go_through_sequential(<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">63</span>, <span class="number">64</span>, <span class="number">65</span>]);
test_go_through_sequential(<span class="kw-2">&amp;</span>[<span class="number">63</span>, <span class="number">64</span>, <span class="number">65</span>]);
test_go_through_sequential(<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">95</span>, <span class="number">96</span>, <span class="number">97</span>, <span class="number">98</span>, <span class="number">99</span>]);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_docbitset_skip() {
{
<span class="kw">let </span><span class="kw-2">mut </span>docset = create_docbitset(<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">5112</span>], <span class="number">10_000</span>);
<span class="macro">assert_eq!</span>(docset.seek(<span class="number">7</span>), <span class="number">7</span>);
<span class="macro">assert_eq!</span>(docset.doc(), <span class="number">7</span>);
<span class="macro">assert_eq!</span>(docset.advance(), <span class="number">5112</span>);
<span class="macro">assert_eq!</span>(docset.doc(), <span class="number">5112</span>);
<span class="macro">assert_eq!</span>(docset.advance(), TERMINATED);
}
{
<span class="kw">let </span><span class="kw-2">mut </span>docset = create_docbitset(<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">5112</span>], <span class="number">10_000</span>);
<span class="macro">assert_eq!</span>(docset.seek(<span class="number">3</span>), <span class="number">5</span>);
<span class="macro">assert_eq!</span>(docset.doc(), <span class="number">5</span>);
<span class="macro">assert_eq!</span>(docset.advance(), <span class="number">6</span>);
}
{
<span class="kw">let </span><span class="kw-2">mut </span>docset = create_docbitset(<span class="kw-2">&amp;</span>[<span class="number">5112</span>], <span class="number">10_000</span>);
<span class="macro">assert_eq!</span>(docset.seek(<span class="number">5112</span>), <span class="number">5112</span>);
<span class="macro">assert_eq!</span>(docset.doc(), <span class="number">5112</span>);
<span class="macro">assert_eq!</span>(docset.advance(), TERMINATED);
}
{
<span class="kw">let </span><span class="kw-2">mut </span>docset = create_docbitset(<span class="kw-2">&amp;</span>[<span class="number">5112</span>], <span class="number">10_000</span>);
<span class="macro">assert_eq!</span>(docset.seek(<span class="number">5113</span>), TERMINATED);
<span class="macro">assert_eq!</span>(docset.advance(), TERMINATED);
}
{
<span class="kw">let </span><span class="kw-2">mut </span>docset = create_docbitset(<span class="kw-2">&amp;</span>[<span class="number">5112</span>], <span class="number">10_000</span>);
<span class="macro">assert_eq!</span>(docset.seek(<span class="number">5111</span>), <span class="number">5112</span>);
<span class="macro">assert_eq!</span>(docset.doc(), <span class="number">5112</span>);
<span class="macro">assert_eq!</span>(docset.advance(), TERMINATED);
}
{
<span class="kw">let </span><span class="kw-2">mut </span>docset = create_docbitset(<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">5112</span>, <span class="number">5500</span>, <span class="number">6666</span>], <span class="number">10_000</span>);
<span class="macro">assert_eq!</span>(docset.seek(<span class="number">5112</span>), <span class="number">5112</span>);
<span class="macro">assert_eq!</span>(docset.doc(), <span class="number">5112</span>);
<span class="macro">assert_eq!</span>(docset.advance(), <span class="number">5500</span>);
<span class="macro">assert_eq!</span>(docset.doc(), <span class="number">5500</span>);
<span class="macro">assert_eq!</span>(docset.advance(), <span class="number">6666</span>);
<span class="macro">assert_eq!</span>(docset.doc(), <span class="number">6666</span>);
<span class="macro">assert_eq!</span>(docset.advance(), TERMINATED);
}
{
<span class="kw">let </span><span class="kw-2">mut </span>docset = create_docbitset(<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">5112</span>, <span class="number">5500</span>, <span class="number">6666</span>], <span class="number">10_000</span>);
<span class="macro">assert_eq!</span>(docset.seek(<span class="number">5111</span>), <span class="number">5112</span>);
<span class="macro">assert_eq!</span>(docset.doc(), <span class="number">5112</span>);
<span class="macro">assert_eq!</span>(docset.advance(), <span class="number">5500</span>);
<span class="macro">assert_eq!</span>(docset.doc(), <span class="number">5500</span>);
<span class="macro">assert_eq!</span>(docset.advance(), <span class="number">6666</span>);
<span class="macro">assert_eq!</span>(docset.doc(), <span class="number">6666</span>);
<span class="macro">assert_eq!</span>(docset.advance(), TERMINATED);
}
{
<span class="kw">let </span><span class="kw-2">mut </span>docset = create_docbitset(<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">5112</span>, <span class="number">5513</span>, <span class="number">6666</span>], <span class="number">10_000</span>);
<span class="macro">assert_eq!</span>(docset.seek(<span class="number">5111</span>), <span class="number">5112</span>);
<span class="macro">assert_eq!</span>(docset.doc(), <span class="number">5112</span>);
<span class="macro">assert_eq!</span>(docset.advance(), <span class="number">5513</span>);
<span class="macro">assert_eq!</span>(docset.doc(), <span class="number">5513</span>);
<span class="macro">assert_eq!</span>(docset.advance(), <span class="number">6666</span>);
<span class="macro">assert_eq!</span>(docset.doc(), <span class="number">6666</span>);
<span class="macro">assert_eq!</span>(docset.advance(), TERMINATED);
}
}
}
<span class="attribute">#[cfg(all(test, feature = <span class="string">&quot;unstable&quot;</span>))]
</span><span class="kw">mod </span>bench {
<span class="kw">use super</span>::{BitSet, BitSetDocSet};
<span class="kw">use </span><span class="kw">crate</span>::docset::TERMINATED;
<span class="kw">use crate</span>::{test, tests, DocSet};
<span class="attribute">#[bench]
</span><span class="kw">fn </span>bench_bitset_1pct_insert(b: <span class="kw-2">&amp;mut </span>test::Bencher) {
<span class="kw">let </span>els = tests::generate_nonunique_unsorted(<span class="number">1_000_000u32</span>, <span class="number">10_000</span>);
b.iter(|| {
<span class="kw">let </span><span class="kw-2">mut </span>bitset = BitSet::with_max_value(<span class="number">1_000_000</span>);
<span class="kw">for </span>el <span class="kw">in </span>els.iter().cloned() {
bitset.insert(el);
}
});
}
<span class="attribute">#[bench]
</span><span class="kw">fn </span>bench_bitset_1pct_clone(b: <span class="kw-2">&amp;mut </span>test::Bencher) {
<span class="kw">let </span>els = tests::generate_nonunique_unsorted(<span class="number">1_000_000u32</span>, <span class="number">10_000</span>);
<span class="kw">let </span><span class="kw-2">mut </span>bitset = BitSet::with_max_value(<span class="number">1_000_000</span>);
<span class="kw">for </span>el <span class="kw">in </span>els {
bitset.insert(el);
}
b.iter(|| bitset.clone());
}
<span class="attribute">#[bench]
</span><span class="kw">fn </span>bench_bitset_1pct_clone_iterate(b: <span class="kw-2">&amp;mut </span>test::Bencher) {
<span class="kw">let </span>els = tests::sample(<span class="number">1_000_000u32</span>, <span class="number">0.01</span>);
<span class="kw">let </span><span class="kw-2">mut </span>bitset = BitSet::with_max_value(<span class="number">1_000_000</span>);
<span class="kw">for </span>el <span class="kw">in </span>els {
bitset.insert(el);
}
b.iter(|| {
<span class="kw">let </span><span class="kw-2">mut </span>docset = BitSetDocSet::from(bitset.clone());
<span class="kw">while </span>docset.advance() != TERMINATED {}
});
}
}
</code></pre></div>
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