38 lines
1.1 KiB
Rust
38 lines
1.1 KiB
Rust
use std::cmp::Ordering;
|
|
use slice_group_by::GroupBy;
|
|
use crate::bucket_sort::SimpleMatch;
|
|
use crate::{RawDocument, MResult};
|
|
use super::{Criterion, Context, ContextMut, prepare_bare_matches};
|
|
|
|
pub struct WordsPosition;
|
|
|
|
impl Criterion for WordsPosition {
|
|
fn name(&self) -> &str { "words position" }
|
|
|
|
fn prepare<'h, 'p, 'tag, 'txn, 'q, 'r>(
|
|
&self,
|
|
ctx: ContextMut<'h, 'p, 'tag, 'txn, 'q>,
|
|
documents: &mut [RawDocument<'r, 'tag>],
|
|
) -> MResult<()>
|
|
{
|
|
prepare_bare_matches(documents, ctx.postings_lists, ctx.query_mapping);
|
|
Ok(())
|
|
}
|
|
|
|
fn evaluate(&self, _ctx: &Context, lhs: &RawDocument, rhs: &RawDocument) -> Ordering {
|
|
#[inline]
|
|
fn sum_words_position(matches: &[SimpleMatch]) -> usize {
|
|
let mut sum_words_position = 0;
|
|
for group in matches.linear_group_by_key(|bm| bm.query_index) {
|
|
sum_words_position += group[0].word_index as usize;
|
|
}
|
|
sum_words_position
|
|
}
|
|
|
|
let lhs = sum_words_position(&lhs.processed_matches);
|
|
let rhs = sum_words_position(&rhs.processed_matches);
|
|
|
|
lhs.cmp(&rhs)
|
|
}
|
|
}
|