66 lines
1.5 KiB
Rust
66 lines
1.5 KiB
Rust
use std::cmp::Ordering;
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use slice_group_by::GroupBy;
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use crate::criterion::Criterion;
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use crate::RawDocument;
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#[inline]
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fn number_exact_matches(query_index: &[u32], is_exact: &[bool]) -> usize {
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let mut count = 0;
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let mut index = 0;
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for group in query_index.linear_group() {
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let len = group.len();
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count += is_exact[index..index + len].contains(&true) as usize;
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index += len;
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}
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count
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}
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#[derive(Debug, Clone, Copy)]
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pub struct Exact;
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impl Criterion for Exact {
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fn evaluate(&self, lhs: &RawDocument, rhs: &RawDocument) -> Ordering {
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let lhs = {
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let query_index = lhs.query_index();
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let is_exact = lhs.is_exact();
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number_exact_matches(query_index, is_exact)
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};
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let rhs = {
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let query_index = rhs.query_index();
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let is_exact = rhs.is_exact();
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number_exact_matches(query_index, is_exact)
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};
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lhs.cmp(&rhs).reverse()
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}
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fn name(&self) -> &str {
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"Exact"
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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// typing: "soulier"
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//
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// doc0: "Soulier bleu"
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// doc1: "souliereres rouge"
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#[test]
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fn easy_case() {
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let query_index0 = &[0];
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let is_exact0 = &[true];
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let query_index1 = &[0];
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let is_exact1 = &[false];
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let doc0 = number_exact_matches(query_index0, is_exact0);
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let doc1 = number_exact_matches(query_index1, is_exact1);
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assert_eq!(doc0.cmp(&doc1).reverse(), Ordering::Less);
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}
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}
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