Method: Taka::DOM::Node#insertBefore

Defined in:
lib/taka/dom/node.rb

#insertBefore(new_child, ref_child) ⇒ Object 



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# File 'lib/taka/dom/node.rb', line 118

def insertBefore new_child, ref_child
  unless can_append?(new_child)
    raise DOMException.new(DOMException::HIERARCHY_REQUEST_ERR)
  end

  if read_only?
    raise DOMException.new(DOMException::NO_MODIFICATION_ALLOWED_ERR)
  end

  if ref_child && !children.include?(ref_child)
    raise DOMException.new(DOMException::NOT_FOUND_ERR)
  end

  if ancestors.include?(new_child)
    raise DOMException.new(DOMException::HIERARCHY_REQUEST_ERR)
  end

  if new_child.document != document
    raise DOMException.new(DOMException::WRONG_DOCUMENT_ERR)
  end

  unless ref_child
    new_child.parent = self
  else
    return ref_child.add_previous_sibling(new_child)
  end
  new_child
end