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Edit File : child.rb \| Size : 2.46 KB
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 encoding = document.encoding to_s end end end Back

Edit File : child.rb | Size : 2.46 KB

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
			encoding = document.encoding

to_s
		end
	end
end

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