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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::docset::DocSet; |
| |
| <span class="doccomment">/// Postings (also called inverted list) |
| /// |
| /// For a given term, it is the list of doc ids of the doc |
| /// containing the term. Optionally, for each document, |
| /// it may also give access to the term frequency |
| /// as well as the list of term positions. |
| /// |
| /// Its main implementation is `SegmentPostings`, |
| /// but other implementations mocking `SegmentPostings` exist, |
| /// for merging segments or for testing. |
| </span><span class="kw">pub trait </span>Postings: DocSet + <span class="lifetime">'static </span>{ |
| <span class="doccomment">/// The number of times the term appears in the document. |
| </span><span class="kw">fn </span>term_freq(<span class="kw-2">&</span><span class="self">self</span>) -> u32; |
| |
| <span class="doccomment">/// Returns the positions offsetted with a given value. |
| /// The output vector will be resized to the `term_freq`. |
| </span><span class="kw">fn </span>positions_with_offset(<span class="kw-2">&mut </span><span class="self">self</span>, offset: u32, output: <span class="kw-2">&mut </span>Vec<u32>); |
| |
| <span class="doccomment">/// Returns the positions of the term in the given document. |
| /// The output vector will be resized to the `term_freq`. |
| </span><span class="kw">fn </span>positions(<span class="kw-2">&mut </span><span class="self">self</span>, output: <span class="kw-2">&mut </span>Vec<u32>) { |
| <span class="self">self</span>.positions_with_offset(<span class="number">0u32</span>, output); |
| } |
| } |
| </code></pre></div> |
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