class REXML::Parent

A parent has children, and has methods for accessing them. The Parent class is never encountered except as the superclass for some other object.

Public Class Methods

new(parent=nil) click to toggle source

Constructor @param parent if supplied, will be set as the parent of this object

Calls superclass method REXML::Child.new

# File lib/rexml/parent.rb, line 12
def initialize parent=nil
  super(parent)
  @children = []
end

Public Instance Methods

<<( object )

Alias for: push

[]( index ) click to toggle source

Fetches a child at a given index @param index the Integer index of the child to fetch

# File lib/rexml/parent.rb, line 56
def []( index )
  @children[index]
end

[]=( *args ) click to toggle source

Set an index entry. See Array#[]= @param index the index of the element to set @param opt either the object to set, or an Integer length @param child if opt is an Integer, this is the child to set @return the parent (self)

# File lib/rexml/parent.rb, line 69
def []=( *args )
  args[-1].parent = self
  @children[*args[0..-2]] = args[-1]
end

add( object ) click to toggle source

# File lib/rexml/parent.rb, line 17
def add( object )
  object.parent = self
  @children << object
  object
end

Also aliased as: push

children()

Alias for: to_a

deep_clone() click to toggle source

Deeply clones this object. This creates a complete duplicate of this Parent, including all descendants.

# File lib/rexml/parent.rb, line 147
def deep_clone
  cl = clone()
  each do |child|
    if child.kind_of? Parent
      cl << child.deep_clone
    else
      cl << child.clone
    end
  end
  cl
end

delete( object ) click to toggle source

# File lib/rexml/parent.rb, line 31
def delete( object )
  found = false
  @children.delete_if {|c| c.equal?(object) and found = true }
  object.parent = nil if found
  found ? object : nil
end

delete_at( index ) click to toggle source

# File lib/rexml/parent.rb, line 46
def delete_at( index )
  @children.delete_at index
end

delete_if( &block ) click to toggle source

# File lib/rexml/parent.rb, line 42
def delete_if( &block )
  @children.delete_if(&block)
end

each(&block) click to toggle source

# File lib/rexml/parent.rb, line 38
def each(&block)
  @children.each(&block)
end

Also aliased as: each_child

each_child(&block)

Alias for: each

each_index( &block ) click to toggle source

# File lib/rexml/parent.rb, line 50
def each_index( &block )
  @children.each_index(&block)
end

index( child ) click to toggle source

Fetches the index of a given child @param child the child to get the index of @return the index of the child, or nil if the object is not a child of this parent.

# File lib/rexml/parent.rb, line 122
def index( child )
  count = -1
  @children.find { |i| count += 1 ; i.hash == child.hash }
  count
end

insert_after( child1, child2 ) click to toggle source

Inserts an child after another child @param child1 this is either an xpath or an Element. If an Element, child2 will be inserted after child1 in the child list of the parent. If an xpath, child2 will be inserted after the first child to match the xpath. @param child2 the child to insert @return the parent (self)

# File lib/rexml/parent.rb, line 101
def insert_after( child1, child2 )
  if child1.kind_of? String
    child1 = XPath.first( self, child1 )
    child1.parent.insert_after child1, child2
  else
    ind = index(child1)+1
    child2.parent.delete(child2) if child2.parent
    @children[ind,0] = child2
    child2.parent = self
  end
  self
end

insert_before( child1, child2 ) click to toggle source

Inserts an child before another child @param child1 this is either an xpath or an Element. If an Element, child2 will be inserted before child1 in the child list of the parent. If an xpath, child2 will be inserted before the first child to match the xpath. @param child2 the child to insert @return the parent (self)

# File lib/rexml/parent.rb, line 81
def insert_before( child1, child2 )
  if child1.kind_of? String
    child1 = XPath.first( self, child1 )
    child1.parent.insert_before child1, child2
  else
    ind = index(child1)
    child2.parent.delete(child2) if child2.parent
    @children[ind,0] = child2
    child2.parent = self
  end
  self
end

length()

Alias for: size

parent?() click to toggle source

# File lib/rexml/parent.rb, line 161
def parent?
  true
end

push( object )

Also aliased as: <<

Alias for: add

replace_child( to_replace, replacement ) click to toggle source

Replaces one child with another, making sure the nodelist is correct @param to_replace the child to replace (must be a Child) @param replacement the child to insert into the nodelist (must be a Child)

# File lib/rexml/parent.rb, line 139
def replace_child( to_replace, replacement )
  @children.map! {|c| c.equal?( to_replace ) ? replacement : c }
  to_replace.parent = nil
  replacement.parent = self
end

size() click to toggle source

@return the number of children of this parent

# File lib/rexml/parent.rb, line 129
def size
  @children.size
end

Also aliased as: length

to_a() click to toggle source

# File lib/rexml/parent.rb, line 114
def to_a
  @children.dup
end

Also aliased as: children

unshift( object ) click to toggle source

# File lib/rexml/parent.rb, line 26
def unshift( object )
  object.parent = self
  @children.unshift object
end