add missing TreeZipperUtils.hs

1 files changed, 12 insertions, 0 deletions

diff --git a/TreeZipperUtils.hs b/TreeZipperUtils.hs
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+++ b/TreeZipperUtils.hs
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+module TreeZipperUtils where
+
+import Data.Tree
+import Data.Tree.Zipper
+
+-- Return loc (as parent-like structure) and  parents.
+path :: TreePos Full a -> [(Forest a, a, Forest a)]
+path loc = toParent loc : parents loc
+
+-- Return parent stack compatible form of loc.
+toParent :: TreePos Full a -> (Forest a, a, Forest a)
+toParent loc = (before loc, label loc, after loc)