Class: TreeRb::CallbackTreeNodeVisitor2

Inherits:
Object
  • Object
show all
Defined in:
lib/tree_rb/visitors/callback_tree_node_visitor2.rb

Overview

Executes a block when enter in a node The block are defined from on_enter_X methods The blocks take as argument the node and the parent_node

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(delegate = nil) ⇒ CallbackTreeNodeVisitor2

Returns a new instance of CallbackTreeNodeVisitor2.



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# File 'lib/tree_rb/visitors/callback_tree_node_visitor2.rb', line 12

def initialize(delegate = nil)
  @stack    = []
  @root     = nil
  @delegate = delegate
end

Instance Attribute Details

#root ⇒ Object (readonly)

Returns the value of attribute root.



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# File 'lib/tree_rb/visitors/callback_tree_node_visitor2.rb', line 10

def root
  @root
end

Instance Method Details

#cannot_enter_node(tree_node, error) ⇒ Object

called when the tree node is not accessible or an exception is raise when the node is accessed



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# File 'lib/tree_rb/visitors/callback_tree_node_visitor2.rb', line 43

def cannot_enter_node( tree_node, error)
end

#enter_node(src_tree_node) ⇒ Object 



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# File 'lib/tree_rb/visitors/callback_tree_node_visitor2.rb', line 28

def enter_node(src_tree_node)
  dst_parent_node = @stack.empty? ? nil : @stack.last
  dst_tree_node = @action_enter_tree_node.call(src_tree_node, dst_parent_node) if @action_enter_tree_node
  dst_tree_node = @delegate.enter_node(src_tree_node, dst_parent_node) if @delegate and @delegate.respond_to? :enter_node
  @root = dst_tree_node if @stack.empty?
  @stack.push(dst_tree_node)
end

#exit_node(src_tree_node) ⇒ Object 



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# File 'lib/tree_rb/visitors/callback_tree_node_visitor2.rb', line 36

def exit_node(src_tree_node)
  @stack.pop
end

#on_enter_node(&block) ⇒ Object 



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# File 'lib/tree_rb/visitors/callback_tree_node_visitor2.rb', line 18

def on_enter_node(&block)
  raise 'already defined a delegate' if @delegate
  @action_enter_tree_node = block
end

#on_visit_leaf(&block) ⇒ Object 



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# File 'lib/tree_rb/visitors/callback_tree_node_visitor2.rb', line 23

def on_visit_leaf(&block)
  raise 'already defined a delegate' if @delegate
  @action_visit_leaf_node = block
end

#visit_leaf(src_leaf_node) ⇒ Object 



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# File 'lib/tree_rb/visitors/callback_tree_node_visitor2.rb', line 46

def visit_leaf(src_leaf_node)
  parent_node = @stack.last
  @action_visit_leaf_node.call(src_leaf_node, parent_node) if @action_visit_leaf_node
  @delegate.visit_leaf(src_leaf_node, parent_node) if @delegate and @delegate.respond_to? :visit_leaf
end