From d4e35a85f9c0ac1aeeee7025bd93fc549aa4c074 Mon Sep 17 00:00:00 2001
From: Michal Moskal <michal@moskal.me>
Date: Thu, 3 Oct 2024 00:18:39 +0000
Subject: [PATCH] add .deep_clone()

---
 parser/src/constraint.rs    | 6 ++++++
 parser/src/earley/parser.rs | 7 +++++++
 parser/src/tokenparser.rs   | 7 +++++++
 3 files changed, 20 insertions(+)

diff --git a/parser/src/constraint.rs b/parser/src/constraint.rs
index c9729320..bdbd6b2c 100644
--- a/parser/src/constraint.rs
+++ b/parser/src/constraint.rs
@@ -65,6 +65,12 @@ impl Constraint {
         }
     }
 
+    pub fn deep_clone(&self) -> Self {
+        let mut copy = self.clone();
+        copy.parser = self.parser.deep_clone();
+        copy
+    }
+
     fn save_progress_and_result(&mut self, res: StepResult) {
         self.last_res = res;
         if self.log_json_progress {
diff --git a/parser/src/earley/parser.rs b/parser/src/earley/parser.rs
index 9214360d..514167b1 100644
--- a/parser/src/earley/parser.rs
+++ b/parser/src/earley/parser.rs
@@ -1855,4 +1855,11 @@ impl Parser {
         let mut shared = self.shared.lock().unwrap();
         self.state.model_variables(&mut shared)
     }
+
+    pub fn deep_clone(&self) -> Self {
+        let mut copy = self.clone();
+        let shared = self.shared.lock().unwrap();
+        copy.shared = Arc::new(Mutex::new(shared.clone()));
+        copy
+    }
 }
diff --git a/parser/src/tokenparser.rs b/parser/src/tokenparser.rs
index 4fe3552f..b37237bd 100644
--- a/parser/src/tokenparser.rs
+++ b/parser/src/tokenparser.rs
@@ -109,6 +109,13 @@ impl TokenParser {
         })
     }
 
+    // regular .clone() uses a shared lexer state
+    pub fn deep_clone(&self) -> Self {
+        let mut copy = self.clone();
+        copy.parser = self.parser.deep_clone();
+        copy
+    }
+
     pub fn stop_reason(&self) -> StopReason {
         self.stop_reason
     }