Copyright  (c) Tom Smeets <tom.tsmeets@gmail.com> 

License  BSD3style (see LICENSE) 
Maintainer  Tom Smeets <tom.tsmeets@gmail.com> 
Stability  unstable 
Portability  unportable 
Safe Haskell  Safe 
Language  Haskell98 
Zipper over the Data.Tree data structure. This module is based on rosezipper.
Synopsis
 data TreeZipper a = TreeZipper {
 tz_current :: Tree a
 tz_before :: Forest a
 tz_after :: Forest a
 tz_parents :: [(Forest a, a, Forest a)]
 cursor :: TreeZipper a > a
 fromForest :: Forest a > TreeZipper a
 toForest :: TreeZipper a > Forest a
 getSubForest :: TreeZipper a > Forest a
 rootNode :: TreeZipper a > TreeZipper a
 parent :: TreeZipper a > Maybe (TreeZipper a)
 children :: TreeZipper a > Maybe (TreeZipper a)
 nextChild :: TreeZipper a > Maybe (TreeZipper a)
 previousChild :: TreeZipper a > Maybe (TreeZipper a)
 nodeDepth :: TreeZipper a > Int
 nodeIndex :: TreeZipper a > Int
 followPath :: Eq b => (a > b) > [b] > TreeZipper a > Maybe (TreeZipper a)
 findChild :: (a > Bool) > TreeZipper a > Maybe (TreeZipper a)
 isLeaf :: TreeZipper a > Bool
 isRoot :: TreeZipper a > Bool
 isLast :: TreeZipper a > Bool
 isFirst :: TreeZipper a > Bool
Data structure
data TreeZipper a Source #
A Zipper over the Data.Tree data structure.
Very crappy visualization of the TreeZipper
data structure
(tz_parents) ([*], *, [*]) ([*, *], *, []) ([], * [*, *])    +++++ +*+ *        (tz_before) (tz_current) (tz_after) * *     +*+ * * *   * *
TreeZipper  

cursor :: TreeZipper a > a Source #
Get the highlighted value
Conversion
fromForest :: Forest a > TreeZipper a Source #
Create a TreeZipper
from a list of Tree
s focused on the first element
getSubForest :: TreeZipper a > Forest a Source #
Create a Forest
from all the children of the current parent
Navigation
rootNode :: TreeZipper a > TreeZipper a Source #
Go to the upper most node such that nothing is before nor above the cursor
parent :: TreeZipper a > Maybe (TreeZipper a) Source #
Move to the parent node
children :: TreeZipper a > Maybe (TreeZipper a) Source #
Move the cursor one level down to the first node
nextChild :: TreeZipper a > Maybe (TreeZipper a) Source #
Go to the next child node
previousChild :: TreeZipper a > Maybe (TreeZipper a) Source #
Go to the previous child node
Utils
nodeDepth :: TreeZipper a > Int Source #
How many nodes are above this one?
nodeIndex :: TreeZipper a > Int Source #
How many nodes are before the cursor? (on the current level)
followPath :: Eq b => (a > b) > [b] > TreeZipper a > Maybe (TreeZipper a) Source #
follow a Path specified by the list of nodes
findChild :: (a > Bool) > TreeZipper a > Maybe (TreeZipper a) Source #
go to the first node next to the cursor that matches
isLeaf :: TreeZipper a > Bool Source #
Check whenther this is a leaf node
isRoot :: TreeZipper a > Bool Source #
Check whenther this is a leaf node
isLast :: TreeZipper a > Bool Source #
Check whenther this the last child
isFirst :: TreeZipper a > Bool Source #
Check whenther this the first child