Module: Fr::SZipper

Defined in:
lib/fr/szipper.rb,
lib/fr/szipper/node.rb,
lib/fr/szipper/enumerable.rb,
lib/fr/szipper/head_cursor.rb,
lib/fr/szipper/edited_cursor.rb,
lib/fr/szipper/abstract_cursor.rb,
lib/fr/szipper/memoized_cursor.rb,
lib/fr/szipper/head_prev_cursor.rb,
lib/fr/szipper/tail_next_cursor.rb

Defined Under Namespace

Modules: Enumerable Classes: AbstractCursor, EditedCursor, HeadCursor, HeadPrevCursor, MemoizedCursor, Node, TailNextCursor

Class Method Summary collapse

Class Method Details

.build(node = nil) ⇒ Object

Constructors a zipper for traversing the given tree or subtree. The ‘node` value can be any structure where

node#next
  the next node

node#last?
  true if no nodes are allowed to be inserted

node#copy(next: ...)
  creates a new node with the given next node



27
28
29
30
31
32
33
 
# File 'lib/fr/szipper.rb', line 27

def build(node = nil)
  if node
    Fr::SZipper::HeadCursor.new(node)
  else
    Fr::SZipper::HeadPrevCursor.new(nil)
  end
end