Move crates under a sub folder to clean up the code

crates/milli/src/proximity.rs

@@ -0,0 +1,37 @@
+use std::cmp;
+
+use serde::{Deserialize, Serialize};
+
+use crate::{relative_from_absolute_position, Position};
+
+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);
+    if lhs_attr != rhs_attr {
+        MAX_DISTANCE
+    } else {
+        index_proximity(lhs_index as u32, rhs_index as u32)
+    }
+}
+
+pub fn path_proximity(path: &[Position]) -> u32 {
+    path.windows(2).map(|w| positions_proximity(w[0], w[1])).sum::<u32>()
+}
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq, Default)]
+#[serde(rename_all = "camelCase")]
+pub enum ProximityPrecision {
+    #[default]
+    ByWord,
+    ByAttribute,
+}