From 9e238ddaaa503210b8e079429a978edeccdef99c Mon Sep 17 00:00:00 2001
From: Ben Bridle <ben@derelict.engineering>
Date: Mon, 3 Mar 2025 17:03:15 +1300
Subject: Add Tracked type

The Tracked type allows tagging an arbitrary type with a SourceSpan.
---
 src/locators/tracked.rs | 58 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 src/locators/tracked.rs

(limited to 'src/locators/tracked.rs')

diff --git a/src/locators/tracked.rs b/src/locators/tracked.rs
new file mode 100644
index 0000000..091ee52
--- /dev/null
+++ b/src/locators/tracked.rs
@@ -0,0 +1,58 @@
+use crate::*;
+
+#[derive(Clone)]
+pub struct Tracked<T> {
+    pub source: SourceSpan,
+    pub value: T,
+}
+
+impl<T> Tracked<T> {
+    pub fn from(value: T, source: SourceSpan) -> Self {
+        Self { source, value }
+    }
+}
+
+impl<T> std::ops::Deref for Tracked<T> {
+    type Target = T;
+    fn deref(&self) -> &T {
+        &self.value
+    }
+}
+
+impl<T> std::ops::DerefMut for Tracked<T> {
+    fn deref_mut(&mut self) -> &mut T {
+        &mut self.value
+    }
+}
+
+impl<T> AsRef<T> for Tracked<T> {
+    fn as_ref(&self) -> &T {
+        &self.value
+    }
+}
+
+impl<T> AsMut<T> for Tracked<T> {
+    fn as_mut(&mut self) -> &mut T {
+        &mut self.value
+    }
+}
+
+impl<T: std::fmt::Display> std::fmt::Display for Tracked<T> {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+        write!(f, "{}", self.value)
+    }
+}
+
+impl<T: std::fmt::Debug> std::fmt::Debug for Tracked<T> {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+        write!(f, "{:?}", self.value)
+    }
+}
+
+impl<T: PartialEq> PartialEq for Tracked<T> {
+    fn eq(&self, other: &Tracked<T>) -> bool {
+        self.value.eq(&other.value)
+    }
+}
+
+impl<T: Eq> Eq for Tracked<T> {}
-- 
cgit v1.2.3-70-g09d2