From 6dd46bfe1c87a4ba4d3ae2feef1270a90ef5f67b Mon Sep 17 00:00:00 2001
From: Michael Davis <mcarsondavis@gmail.com>
Date: Wed, 10 Jan 2024 13:06:57 -0500
Subject: [PATCH] syntax: Track parent LanguageLayer IDs

This commit adds a `parent` field to the `LanguageLayer`. This
information is conveniently already available when we parse injections.
This will be used in the child commit to create a type that can
traverse injection layers using this information.
---
 helix-core/src/syntax.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/helix-core/src/syntax.rs b/helix-core/src/syntax.rs
index 0e8917191..6414f3ce9 100644
--- a/helix-core/src/syntax.rs
+++ b/helix-core/src/syntax.rs
@@ -1090,6 +1090,7 @@ impl Syntax {
                 start_point: Point::new(0, 0),
                 end_point: Point::new(usize::MAX, usize::MAX),
             }],
+            parent: None,
         };
 
         // track scope_descriptor: a Vec of scopes for item in tree
@@ -1360,6 +1361,7 @@ impl Syntax {
                         depth,
                         ranges,
                         flags: LayerUpdateFlags::empty(),
+                        parent: Some(layer_id),
                     };
 
                     // Find an identical existing layer
@@ -1525,6 +1527,7 @@ pub struct LanguageLayer {
     pub ranges: Vec<Range>,
     pub depth: u32,
     flags: LayerUpdateFlags,
+    parent: Option<LayerId>,
 }
 
 /// This PartialEq implementation only checks if that