meilisearch/milli/src/proximity.rs

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Rust
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use std::cmp;
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use crate::{relative_from_absolute_position, Position};
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pub const MAX_DISTANCE: u32 = 4;
pub fn index_proximity(lhs: u32, rhs: u32) -> u32 {
if lhs <= rhs {
cmp::min(rhs - lhs, MAX_DISTANCE)
} else {
cmp::min((lhs - rhs) + 1, MAX_DISTANCE)
}
}
pub fn positions_proximity(lhs: Position, rhs: Position) -> u32 {
let (lhs_attr, lhs_index) = relative_from_absolute_position(lhs);
let (rhs_attr, rhs_index) = relative_from_absolute_position(rhs);
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if lhs_attr != rhs_attr {
MAX_DISTANCE
} else {
index_proximity(lhs_index as u32, rhs_index as u32)
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}
}
pub fn path_proximity(path: &[Position]) -> u32 {
path.windows(2).map(|w| positions_proximity(w[0], w[1])).sum::<u32>()
}