Module: Riml::Walkable

Includes:
Enumerable
Included in:
Visitable
Defined in:
lib/riml/walkable.rb

Instance Method Summary collapse

Instance Method Details

#child_after(node) ⇒ Object 



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# File 'lib/riml/walkable.rb', line 44

def child_after(node)
  node.next
end

#child_previous_to(node) ⇒ Object 



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# File 'lib/riml/walkable.rb', line 22

def child_previous_to(node)
  node.previous
end

#each(&block) ⇒ Object Also known as: walk 



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# File 'lib/riml/walkable.rb', line 5

def each(&block)
  children.each(&block)
end

#index_by_children ⇒ Object 



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# File 'lib/riml/walkable.rb', line 64

def index_by_children
  parent.children.find_index(self)
end

#index_by_member ⇒ Object 



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# File 'lib/riml/walkable.rb', line 54

def index_by_member
  attrs = parent.members
  attrs.each_with_index do |attr, i|
    if parent.send(attr) == self
      return i
    end
  end
  nil
end

#insert_after(node, new_node) ⇒ Object 



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# File 'lib/riml/walkable.rb', line 48

def insert_after(node, new_node)
  idx = children.find_index(node)
  return unless idx
  children.insert(idx + 1, new_node)
end

#insert_before(node, new_node) ⇒ Object 



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# File 'lib/riml/walkable.rb', line 26

def insert_before(node, new_node)
  idx = children.find_index(node)
  return unless idx
  children.insert(idx - 1, new_node)
end

#next ⇒ Object 



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# File 'lib/riml/walkable.rb', line 32

def next
  idx = index_by_member
  if idx && parent.members[idx + 1]
    attr = parent.members[idx + 1]
    return parent.send(attr)
  else
    idx = index_by_children
    return unless idx
    parent.children.fetch(idx + 1)
  end
end

#previous ⇒ Object 



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# File 'lib/riml/walkable.rb', line 10

def previous
  idx = index_by_member
  if idx && parent.members[idx - 1]
    attr = parent.members[idx - 1]
    return send(attr)
  else
    idx = index_by_children
    return unless idx
    parent.children.fetch(idx - 1)
  end
end

#remove ⇒ Object 



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# File 'lib/riml/walkable.rb', line 68

def remove
  idx = index_by_member
  if idx
    attr = parent.members[idx]
    parent.send("#{attr}=", nil)
  else
    idx = index_by_children
    parent.children.slice!(idx) if idx
  end
end

#replace_with(new_node) ⇒ Object 



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# File 'lib/riml/walkable.rb', line 79

def replace_with(new_node)
  idx = index_by_member
  if idx
    attr = parent.members[idx]
    new_node.parent = parent
    parent.send("#{attr}=", new_node)
    new_node
  else
    idx = index_by_children
    return unless idx
    new_node.parent = parent
    parent.children.insert(idx, new_node)
    parent.children.slice!(idx + 1)
    new_node
  end
end