JezK
Edit File: child.rb
require "rexml/node" module REXML ## # A Child object is something contained by a parent, and this class # contains methods to support that. Most user code will not use this # class directly. class Child include Node attr_reader :parent # The Parent of this object # Constructor. Any inheritors of this class should call super to make # sure this method is called. # parent:: # if supplied, the parent of this child will be set to the # supplied value, and self will be added to the parent def initialize( parent = nil ) @parent = nil # Declare @parent, but don't define it. The next line sets the # parent. parent.add( self ) if parent end # Replaces this object with another object. Basically, calls # Parent.replace_child # # Returns:: self def replace_with( child ) @parent.replace_child( self, child ) self end # Removes this child from the parent. # # Returns:: self def remove unless @parent.nil? @parent.delete self end self end # Sets the parent of this child to the supplied argument. # # other:: # Must be a Parent object. If this object is the same object as the # existing parent of this child, no action is taken. Otherwise, this # child is removed from the current parent (if one exists), and is added # to the new parent. # Returns:: The parent added def parent=( other ) return @parent if @parent == other @parent.delete self if defined? @parent and @parent @parent = other end alias :next_sibling :next_sibling_node alias :previous_sibling :previous_sibling_node # Sets the next sibling of this child. This can be used to insert a child # after some other child. # a = Element.new("a") # b = a.add_element("b") # c = Element.new("c") # b.next_sibling = c # # => <a><b/><c/></a> def next_sibling=( other ) parent.insert_after self, other end # Sets the previous sibling of this child. This can be used to insert a # child before some other child. # a = Element.new("a") # b = a.add_element("b") # c = Element.new("c") # b.previous_sibling = c # # => <a><b/><c/></a> def previous_sibling=(other) parent.insert_before self, other end # Returns:: the document this child belongs to, or nil if this child # belongs to no document def document return parent.document unless parent.nil? nil end # This doesn't yet handle encodings def bytes document.encoding to_s end end end