removed bloat from mapping

crates/parser/src/rev_mapper.rs

@@ -0,0 +1,70 @@
+use std::{collections::HashSet, path::PathBuf};
+
+use serde::{Deserialize, Serialize};
+
+#[derive(
+    Debug, Default, Clone, Copy, Hash, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize,
+)]
+pub struct MistMap(pub usize, pub usize);
+
+#[derive(
+    Debug, Default, Clone, Copy, Hash, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize,
+)]
+pub struct RustMap(pub usize, pub usize);
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Mapping {
+    pub mist_path: PathBuf,
+    pub map: HashSet<(RustMap, MistMap)>,
+}
+
+impl Mapping {
+    pub fn new(mist_path: PathBuf) -> Self {
+        Self {
+            mist_path,
+            map: HashSet::new(),
+        }
+    }
+
+    pub fn find(&self, target: &RustMap) -> Option<(RustMap, MistMap)> {
+        self.map
+            .iter()
+            .copied()
+            .filter(|(rust, _)| rust <= target)
+            .max_by_key(|(rust, _)| *rust)
+    }
+
+    pub fn shift_rust(&mut self, lines: isize, cols: isize) {
+        self.map = self
+            .map
+            .iter()
+            .map(|(rust, mist)| (rust.shifted(lines, cols), *mist))
+            .collect();
+    }
+
+    pub fn shift_mist(&mut self, lines: isize, cols: isize) {
+        self.map = self
+            .map
+            .iter()
+            .map(|(rust, mist)| (*rust, mist.shifted(lines, cols)))
+            .collect();
+    }
+}
+
+impl RustMap {
+    pub fn shifted(self, lines: isize, cols: isize) -> Self {
+        Self(
+            self.0.saturating_add_signed(lines),
+            self.1.saturating_add_signed(cols),
+        )
+    }
+}
+
+impl MistMap {
+    pub fn shifted(self, lines: isize, cols: isize) -> Self {
+        Self(
+            self.0.saturating_add_signed(lines),
+            self.1.saturating_add_signed(cols),
+        )
+    }
+}