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</pre><pre class="rust"><code><span class="kw">use </span>std::fmt;
<span class="kw">use </span>std::ops::Bound;
<span class="kw">use </span><span class="kw">crate</span>::query::Occur;
<span class="kw">use </span><span class="kw">crate</span>::schema::{Field, Term, Type};
<span class="kw">use </span><span class="kw">crate</span>::Score;
<span class="attribute">#[derive(Clone)]
</span><span class="kw">pub enum </span>LogicalLiteral {
Term(Term),
Phrase(Vec&lt;(usize, Term)&gt;, u32),
Range {
field: Field,
value_type: Type,
lower: Bound&lt;Term&gt;,
upper: Bound&lt;Term&gt;,
},
Set {
field: Field,
value_type: Type,
elements: Vec&lt;Term&gt;,
},
All,
}
<span class="kw">pub enum </span>LogicalAst {
Clause(Vec&lt;(Occur, LogicalAst)&gt;),
Leaf(Box&lt;LogicalLiteral&gt;),
Boost(Box&lt;LogicalAst&gt;, Score),
}
<span class="kw">impl </span>LogicalAst {
<span class="kw">pub fn </span>boost(<span class="self">self</span>, boost: Score) -&gt; LogicalAst {
<span class="kw">if </span>(boost - <span class="number">1.0</span>).abs() &lt; Score::EPSILON {
<span class="self">self
</span>} <span class="kw">else </span>{
LogicalAst::Boost(Box::new(<span class="self">self</span>), boost)
}
}
}
<span class="kw">fn </span>occur_letter(occur: Occur) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str {
<span class="kw">match </span>occur {
Occur::Must =&gt; <span class="string">&quot;+&quot;</span>,
Occur::MustNot =&gt; <span class="string">&quot;-&quot;</span>,
Occur::Should =&gt; <span class="string">&quot;&quot;</span>,
}
}
<span class="kw">impl </span>fmt::Debug <span class="kw">for </span>LogicalAst {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, formatter: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;(), fmt::Error&gt; {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
LogicalAst::Clause(<span class="kw-2">ref </span>clause) =&gt; {
<span class="kw">if </span>clause.is_empty() {
<span class="macro">write!</span>(formatter, <span class="string">&quot;&lt;emptyclause&gt;&quot;</span>)<span class="question-mark">?</span>;
} <span class="kw">else </span>{
<span class="kw">let </span>(<span class="kw-2">ref </span>occur, <span class="kw-2">ref </span>subquery) = clause[<span class="number">0</span>];
<span class="macro">write!</span>(formatter, <span class="string">&quot;({}{:?}&quot;</span>, occur_letter(<span class="kw-2">*</span>occur), subquery)<span class="question-mark">?</span>;
<span class="kw">for </span><span class="kw-2">&amp;</span>(<span class="kw-2">ref </span>occur, <span class="kw-2">ref </span>subquery) <span class="kw">in </span><span class="kw-2">&amp;</span>clause[<span class="number">1</span>..] {
<span class="macro">write!</span>(formatter, <span class="string">&quot; {}{:?}&quot;</span>, occur_letter(<span class="kw-2">*</span>occur), subquery)<span class="question-mark">?</span>;
}
formatter.write_str(<span class="string">&quot;)&quot;</span>)<span class="question-mark">?</span>;
}
<span class="prelude-val">Ok</span>(())
}
LogicalAst::Boost(<span class="kw-2">ref </span>ast, boost) =&gt; <span class="macro">write!</span>(formatter, <span class="string">&quot;{:?}^{}&quot;</span>, ast, boost),
LogicalAst::Leaf(<span class="kw-2">ref </span>literal) =&gt; <span class="macro">write!</span>(formatter, <span class="string">&quot;{:?}&quot;</span>, literal),
}
}
}
<span class="kw">impl </span>From&lt;LogicalLiteral&gt; <span class="kw">for </span>LogicalAst {
<span class="kw">fn </span>from(literal: LogicalLiteral) -&gt; LogicalAst {
LogicalAst::Leaf(Box::new(literal))
}
}
<span class="kw">impl </span>fmt::Debug <span class="kw">for </span>LogicalLiteral {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, formatter: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;(), fmt::Error&gt; {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
LogicalLiteral::Term(<span class="kw-2">ref </span>term) =&gt; <span class="macro">write!</span>(formatter, <span class="string">&quot;{:?}&quot;</span>, term),
LogicalLiteral::Phrase(<span class="kw-2">ref </span>terms, slop) =&gt; {
<span class="macro">write!</span>(formatter, <span class="string">&quot;\&quot;{:?}\&quot;&quot;</span>, terms)<span class="question-mark">?</span>;
<span class="kw">if </span>slop &gt; <span class="number">0 </span>{
<span class="macro">write!</span>(formatter, <span class="string">&quot;~{:?}&quot;</span>, slop)
} <span class="kw">else </span>{
<span class="prelude-val">Ok</span>(())
}
}
LogicalLiteral::Range {
<span class="kw-2">ref </span>lower,
<span class="kw-2">ref </span>upper,
..
} =&gt; <span class="macro">write!</span>(formatter, <span class="string">&quot;({:?} TO {:?})&quot;</span>, lower, upper),
LogicalLiteral::Set { <span class="kw-2">ref </span>elements, .. } =&gt; {
<span class="kw">const </span>MAX_DISPLAYED: usize = <span class="number">10</span>;
<span class="macro">write!</span>(formatter, <span class="string">&quot;IN [&quot;</span>)<span class="question-mark">?</span>;
<span class="kw">for </span>(i, element) <span class="kw">in </span>elements.iter().enumerate() {
<span class="kw">if </span>i == <span class="number">0 </span>{
<span class="macro">write!</span>(formatter, <span class="string">&quot;{:?}&quot;</span>, element)<span class="question-mark">?</span>;
} <span class="kw">else if </span>i == MAX_DISPLAYED - <span class="number">1 </span>{
<span class="macro">write!</span>(
formatter,
<span class="string">&quot;, {:?}, ... ({} more)&quot;</span>,
element,
elements.len() - i - <span class="number">1
</span>)<span class="question-mark">?</span>;
<span class="kw">break</span>;
} <span class="kw">else </span>{
<span class="macro">write!</span>(formatter, <span class="string">&quot;, {:?}&quot;</span>, element)<span class="question-mark">?</span>;
}
}
<span class="macro">write!</span>(formatter, <span class="string">&quot;]&quot;</span>)
}
LogicalLiteral::All =&gt; <span class="macro">write!</span>(formatter, <span class="string">&quot;*&quot;</span>),
}
}
}
</code></pre></div>
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