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 </pre><pre class="rust"><code><span class="kw">use </span>std::collections::HashMap;

 <span class="kw">use </span><span class="kw">crate</span>::core::SegmentReader;
 <span class="kw">use </span><span class="kw">crate</span>::postings::FreqReadingOption;
 <span class="kw">use </span><span class="kw">crate</span>::query::explanation::does_not_match;
 <span class="kw">use </span><span class="kw">crate</span>::query::score_combiner::{DoNothingCombiner, ScoreCombiner};
 <span class="kw">use </span><span class="kw">crate</span>::query::term_query::TermScorer;
 <span class="kw">use </span><span class="kw">crate</span>::query::weight::{for_each_docset, for_each_pruning_scorer, for_each_scorer};
 <span class="kw">use </span><span class="kw">crate</span>::query::{
     intersect_scorers, EmptyScorer, Exclude, Explanation, Occur, RequiredOptionalScorer, Scorer,
     Union, Weight,
 };
 <span class="kw">use crate</span>::{DocId, Score};

 <span class="kw">enum </span>SpecializedScorer {
     TermUnion(Vec&lt;TermScorer&gt;),
     Other(Box&lt;<span class="kw">dyn </span>Scorer&gt;),
 }

 <span class="kw">fn </span>scorer_union&lt;TScoreCombiner&gt;(
     scorers: Vec&lt;Box&lt;<span class="kw">dyn </span>Scorer&gt;&gt;,
     score_combiner_fn: <span class="kw">impl </span>Fn() -&gt; TScoreCombiner,
 ) -&gt; SpecializedScorer
 <span class="kw">where
     </span>TScoreCombiner: ScoreCombiner,
 {
     <span class="macro">assert!</span>(!scorers.is_empty());
     <span class="kw">if </span>scorers.len() == <span class="number">1 </span>{
         <span class="kw">return </span>SpecializedScorer::Other(scorers.into_iter().next().unwrap()); <span class="comment">//&lt; we checked the size beforehand
     </span>}

     {
         <span class="kw">let </span>is_all_term_queries = scorers.iter().all(|scorer| scorer.is::&lt;TermScorer&gt;());
         <span class="kw">if </span>is_all_term_queries {
             <span class="kw">let </span>scorers: Vec&lt;TermScorer&gt; = scorers
                 .into_iter()
                 .map(|scorer| <span class="kw-2">*</span>(scorer.downcast::&lt;TermScorer&gt;().map_err(|<span class="kw">_</span>| ()).unwrap()))
                 .collect();
             <span class="kw">if </span>scorers
                 .iter()
                 .all(|scorer| scorer.freq_reading_option() == FreqReadingOption::ReadFreq)
             {
                 <span class="comment">// Block wand is only available if we read frequencies.
                 </span><span class="kw">return </span>SpecializedScorer::TermUnion(scorers);
             } <span class="kw">else </span>{
                 <span class="kw">return </span>SpecializedScorer::Other(Box::new(Union::build(
                     scorers,
                     score_combiner_fn,
                 )));
             }
         }
     }
     SpecializedScorer::Other(Box::new(Union::build(scorers, score_combiner_fn)))
 }

 <span class="kw">fn </span>into_box_scorer&lt;TScoreCombiner: ScoreCombiner&gt;(
     scorer: SpecializedScorer,
     score_combiner_fn: <span class="kw">impl </span>Fn() -&gt; TScoreCombiner,
 ) -&gt; Box&lt;<span class="kw">dyn </span>Scorer&gt; {
     <span class="kw">match </span>scorer {
         SpecializedScorer::TermUnion(term_scorers) =&gt; {
             <span class="kw">let </span>union_scorer = Union::build(term_scorers, score_combiner_fn);
             Box::new(union_scorer)
         }
         SpecializedScorer::Other(scorer) =&gt; scorer,
     }
 }

 <span class="kw">pub struct </span>BooleanWeight&lt;TScoreCombiner: ScoreCombiner&gt; {
     weights: Vec&lt;(Occur, Box&lt;<span class="kw">dyn </span>Weight&gt;)&gt;,
     scoring_enabled: bool,
     score_combiner_fn: Box&lt;<span class="kw">dyn </span>Fn() -&gt; TScoreCombiner + Sync + Send&gt;,
 }

 <span class="kw">impl</span>&lt;TScoreCombiner: ScoreCombiner&gt; BooleanWeight&lt;TScoreCombiner&gt; {
     <span class="kw">pub fn </span>new(
         weights: Vec&lt;(Occur, Box&lt;<span class="kw">dyn </span>Weight&gt;)&gt;,
         scoring_enabled: bool,
         score_combiner_fn: Box&lt;<span class="kw">dyn </span>Fn() -&gt; TScoreCombiner + Sync + Send + <span class="lifetime">&#39;static</span>&gt;,
     ) -&gt; BooleanWeight&lt;TScoreCombiner&gt; {
         BooleanWeight {
             weights,
             scoring_enabled,
             score_combiner_fn,
         }
     }

     <span class="kw">fn </span>per_occur_scorers(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         reader: <span class="kw-2">&amp;</span>SegmentReader,
         boost: Score,
     ) -&gt; <span class="kw">crate</span>::Result&lt;HashMap&lt;Occur, Vec&lt;Box&lt;<span class="kw">dyn </span>Scorer&gt;&gt;&gt;&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>per_occur_scorers: HashMap&lt;Occur, Vec&lt;Box&lt;<span class="kw">dyn </span>Scorer&gt;&gt;&gt; = HashMap::new();
         <span class="kw">for </span><span class="kw-2">&amp;</span>(<span class="kw-2">ref </span>occur, <span class="kw-2">ref </span>subweight) <span class="kw">in </span><span class="kw-2">&amp;</span><span class="self">self</span>.weights {
             <span class="kw">let </span>sub_scorer: Box&lt;<span class="kw">dyn </span>Scorer&gt; = subweight.scorer(reader, boost)<span class="question-mark">?</span>;
             per_occur_scorers
                 .entry(<span class="kw-2">*</span>occur)
                 .or_insert_with(Vec::new)
                 .push(sub_scorer);
         }
         <span class="prelude-val">Ok</span>(per_occur_scorers)
     }

     <span class="kw">fn </span>complex_scorer&lt;TComplexScoreCombiner: ScoreCombiner&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         reader: <span class="kw-2">&amp;</span>SegmentReader,
         boost: Score,
         score_combiner_fn: <span class="kw">impl </span>Fn() -&gt; TComplexScoreCombiner,
     ) -&gt; <span class="kw">crate</span>::Result&lt;SpecializedScorer&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>per_occur_scorers = <span class="self">self</span>.per_occur_scorers(reader, boost)<span class="question-mark">?</span>;

         <span class="kw">let </span>should_scorer_opt: <span class="prelude-ty">Option</span>&lt;SpecializedScorer&gt; = per_occur_scorers
             .remove(<span class="kw-2">&amp;</span>Occur::Should)
             .map(|scorers| scorer_union(scorers, <span class="kw-2">&amp;</span>score_combiner_fn));
         <span class="kw">let </span>exclude_scorer_opt: <span class="prelude-ty">Option</span>&lt;Box&lt;<span class="kw">dyn </span>Scorer&gt;&gt; = per_occur_scorers
             .remove(<span class="kw-2">&amp;</span>Occur::MustNot)
             .map(|scorers| scorer_union(scorers, DoNothingCombiner::default))
             .map(|specialized_scorer| {
                 into_box_scorer(specialized_scorer, DoNothingCombiner::default)
             });

         <span class="kw">let </span>must_scorer_opt: <span class="prelude-ty">Option</span>&lt;Box&lt;<span class="kw">dyn </span>Scorer&gt;&gt; = per_occur_scorers
             .remove(<span class="kw-2">&amp;</span>Occur::Must)
             .map(intersect_scorers);

         <span class="kw">let </span>positive_scorer: SpecializedScorer = <span class="kw">match </span>(should_scorer_opt, must_scorer_opt) {
             (<span class="prelude-val">Some</span>(should_scorer), <span class="prelude-val">Some</span>(must_scorer)) =&gt; {
                 <span class="kw">if </span><span class="self">self</span>.scoring_enabled {
                     SpecializedScorer::Other(Box::new(RequiredOptionalScorer::&lt;
                         Box&lt;<span class="kw">dyn </span>Scorer&gt;,
                         Box&lt;<span class="kw">dyn </span>Scorer&gt;,
                         TComplexScoreCombiner,
                     &gt;::new(
                         must_scorer,
                         into_box_scorer(should_scorer, <span class="kw-2">&amp;</span>score_combiner_fn),
                     )))
                 } <span class="kw">else </span>{
                     SpecializedScorer::Other(must_scorer)
                 }
             }
             (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(must_scorer)) =&gt; SpecializedScorer::Other(must_scorer),
             (<span class="prelude-val">Some</span>(should_scorer), <span class="prelude-val">None</span>) =&gt; should_scorer,
             (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) =&gt; {
                 <span class="kw">return </span><span class="prelude-val">Ok</span>(SpecializedScorer::Other(Box::new(EmptyScorer)));
             }
         };

         <span class="kw">if let </span><span class="prelude-val">Some</span>(exclude_scorer) = exclude_scorer_opt {
             <span class="kw">let </span>positive_scorer_boxed = into_box_scorer(positive_scorer, <span class="kw-2">&amp;</span>score_combiner_fn);
             <span class="prelude-val">Ok</span>(SpecializedScorer::Other(Box::new(Exclude::new(
                 positive_scorer_boxed,
                 exclude_scorer,
             ))))
         } <span class="kw">else </span>{
             <span class="prelude-val">Ok</span>(positive_scorer)
         }
     }
 }

 <span class="kw">impl</span>&lt;TScoreCombiner: ScoreCombiner + Sync&gt; Weight <span class="kw">for </span>BooleanWeight&lt;TScoreCombiner&gt; {
     <span class="kw">fn </span>scorer(<span class="kw-2">&amp;</span><span class="self">self</span>, reader: <span class="kw-2">&amp;</span>SegmentReader, boost: Score) -&gt; <span class="kw">crate</span>::Result&lt;Box&lt;<span class="kw">dyn </span>Scorer&gt;&gt; {
         <span class="kw">if </span><span class="self">self</span>.weights.is_empty() {
             <span class="prelude-val">Ok</span>(Box::new(EmptyScorer))
         } <span class="kw">else if </span><span class="self">self</span>.weights.len() == <span class="number">1 </span>{
             <span class="kw">let </span><span class="kw-2">&amp;</span>(occur, <span class="kw-2">ref </span>weight) = <span class="kw-2">&amp;</span><span class="self">self</span>.weights[<span class="number">0</span>];
             <span class="kw">if </span>occur == Occur::MustNot {
                 <span class="prelude-val">Ok</span>(Box::new(EmptyScorer))
             } <span class="kw">else </span>{
                 weight.scorer(reader, boost)
             }
         } <span class="kw">else if </span><span class="self">self</span>.scoring_enabled {
             <span class="self">self</span>.complex_scorer(reader, boost, <span class="kw-2">&amp;</span><span class="self">self</span>.score_combiner_fn)
                 .map(|specialized_scorer| {
                     into_box_scorer(specialized_scorer, <span class="kw-2">&amp;</span><span class="self">self</span>.score_combiner_fn)
                 })
         } <span class="kw">else </span>{
             <span class="self">self</span>.complex_scorer(reader, boost, DoNothingCombiner::default)
                 .map(|specialized_scorer| {
                     into_box_scorer(specialized_scorer, DoNothingCombiner::default)
                 })
         }
     }

     <span class="kw">fn </span>explain(<span class="kw-2">&amp;</span><span class="self">self</span>, reader: <span class="kw-2">&amp;</span>SegmentReader, doc: DocId) -&gt; <span class="kw">crate</span>::Result&lt;Explanation&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>scorer = <span class="self">self</span>.scorer(reader, <span class="number">1.0</span>)<span class="question-mark">?</span>;
         <span class="kw">if </span>scorer.seek(doc) != doc {
             <span class="kw">return </span><span class="prelude-val">Err</span>(does_not_match(doc));
         }
         <span class="kw">if </span>!<span class="self">self</span>.scoring_enabled {
             <span class="kw">return </span><span class="prelude-val">Ok</span>(Explanation::new(<span class="string">&quot;BooleanQuery with no scoring&quot;</span>, <span class="number">1.0</span>));
         }

         <span class="kw">let </span><span class="kw-2">mut </span>explanation = Explanation::new(<span class="string">&quot;BooleanClause. Sum of ...&quot;</span>, scorer.score());
         <span class="kw">for </span><span class="kw-2">&amp;</span>(<span class="kw-2">ref </span>occur, <span class="kw-2">ref </span>subweight) <span class="kw">in </span><span class="kw-2">&amp;</span><span class="self">self</span>.weights {
             <span class="kw">if </span>is_positive_occur(<span class="kw-2">*</span>occur) {
                 <span class="kw">if let </span><span class="prelude-val">Ok</span>(child_explanation) = subweight.explain(reader, doc) {
                     explanation.add_detail(child_explanation);
                 }
             }
         }
         <span class="prelude-val">Ok</span>(explanation)
     }

     <span class="kw">fn </span>for_each(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         reader: <span class="kw-2">&amp;</span>SegmentReader,
         callback: <span class="kw-2">&amp;mut </span><span class="kw">dyn </span>FnMut(DocId, Score),
     ) -&gt; <span class="kw">crate</span>::Result&lt;()&gt; {
         <span class="kw">let </span>scorer = <span class="self">self</span>.complex_scorer(reader, <span class="number">1.0</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.score_combiner_fn)<span class="question-mark">?</span>;
         <span class="kw">match </span>scorer {
             SpecializedScorer::TermUnion(term_scorers) =&gt; {
                 <span class="kw">let </span><span class="kw-2">mut </span>union_scorer = Union::build(term_scorers, <span class="kw-2">&amp;</span><span class="self">self</span>.score_combiner_fn);
                 for_each_scorer(<span class="kw-2">&amp;mut </span>union_scorer, callback);
             }
             SpecializedScorer::Other(<span class="kw-2">mut </span>scorer) =&gt; {
                 for_each_scorer(scorer.as_mut(), callback);
             }
         }
         <span class="prelude-val">Ok</span>(())
     }

     <span class="kw">fn </span>for_each_no_score(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         reader: <span class="kw-2">&amp;</span>SegmentReader,
         callback: <span class="kw-2">&amp;mut </span><span class="kw">dyn </span>FnMut(DocId),
     ) -&gt; <span class="kw">crate</span>::Result&lt;()&gt; {
         <span class="kw">let </span>scorer = <span class="self">self</span>.complex_scorer(reader, <span class="number">1.0</span>, || DoNothingCombiner)<span class="question-mark">?</span>;
         <span class="kw">match </span>scorer {
             SpecializedScorer::TermUnion(term_scorers) =&gt; {
                 <span class="kw">let </span><span class="kw-2">mut </span>union_scorer = Union::build(term_scorers, <span class="kw-2">&amp;</span><span class="self">self</span>.score_combiner_fn);
                 for_each_docset(<span class="kw-2">&amp;mut </span>union_scorer, callback);
             }
             SpecializedScorer::Other(<span class="kw-2">mut </span>scorer) =&gt; {
                 for_each_docset(scorer.as_mut(), callback);
             }
         }
         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Calls `callback` with all of the `(doc, score)` for which score
     /// is exceeding a given threshold.
     ///
     /// This method is useful for the TopDocs collector.
     /// For all docsets, the blanket implementation has the benefit
     /// of prefiltering (doc, score) pairs, avoiding the
     /// virtual dispatch cost.
     ///
     /// More importantly, it makes it possible for scorers to implement
     /// important optimization (e.g. BlockWAND for union).
     </span><span class="kw">fn </span>for_each_pruning(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         threshold: Score,
         reader: <span class="kw-2">&amp;</span>SegmentReader,
         callback: <span class="kw-2">&amp;mut </span><span class="kw">dyn </span>FnMut(DocId, Score) -&gt; Score,
     ) -&gt; <span class="kw">crate</span>::Result&lt;()&gt; {
         <span class="kw">let </span>scorer = <span class="self">self</span>.complex_scorer(reader, <span class="number">1.0</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.score_combiner_fn)<span class="question-mark">?</span>;
         <span class="kw">match </span>scorer {
             SpecializedScorer::TermUnion(term_scorers) =&gt; {
                 <span class="kw">super</span>::block_wand(term_scorers, threshold, callback);
             }
             SpecializedScorer::Other(<span class="kw-2">mut </span>scorer) =&gt; {
                 for_each_pruning_scorer(scorer.as_mut(), threshold, callback);
             }
         }
         <span class="prelude-val">Ok</span>(())
     }
 }

 <span class="kw">fn </span>is_positive_occur(occur: Occur) -&gt; bool {
     <span class="kw">match </span>occur {
         Occur::Must | Occur::Should =&gt; <span class="bool-val">true</span>,
         Occur::MustNot =&gt; <span class="bool-val">false</span>,
     }
 }
 </code></pre></div>
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