From 7f2233ddaff7cb75a5672a6d1624bbef471bebd4 Mon Sep 17 00:00:00 2001
From: Andrey Zaytsev <andrey.zaytsev@jetbrains.com>
Date: Sun, 16 Jun 2019 19:52:37 +0200
Subject: [PATCH] Ts tree cursor copy (#363)

* add ts_tree_cursor_copy fn

* indentation
---
 lib/include/tree_sitter/api.h | 2 ++
 lib/src/tree_cursor.c         | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/lib/include/tree_sitter/api.h b/lib/include/tree_sitter/api.h
index d8189930..b07f929f 100644
--- a/lib/include/tree_sitter/api.h
+++ b/lib/include/tree_sitter/api.h
@@ -593,6 +593,8 @@ bool ts_tree_cursor_goto_first_child(TSTreeCursor *);
  * if no such child was found.
  */
 int64_t ts_tree_cursor_goto_first_child_for_byte(TSTreeCursor *, uint32_t);
+    
+TSTreeCursor ts_tree_cursor_copy(const TSTreeCursor *);
 
 /**********************/
 /* Section - Language */
diff --git a/lib/src/tree_cursor.c b/lib/src/tree_cursor.c
index 35aeebb3..7103fc41 100644
--- a/lib/src/tree_cursor.c
+++ b/lib/src/tree_cursor.c
@@ -291,3 +291,12 @@ const char *ts_tree_cursor_current_field_name(const TSTreeCursor *_self) {
     return NULL;
   }
 }
+
+TSTreeCursor ts_tree_cursor_copy(const TSTreeCursor *_cursor) {
+  const TreeCursor *cursor = (const TreeCursor *)_cursor;
+  TSTreeCursor res = {NULL, NULL, {0, 0}};
+  TreeCursor *copy = (TreeCursor *)&res;
+  copy->tree = cursor->tree;
+  array_push_all(&copy->stack, &cursor->stack);
+  return res;
+}