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Edit File : parent.rb \| Size : 4.33 KB
require "rexml/child" module REXML # A parent has children, and has methods for accessing them. The Parent # class is never encountered except as the superclass for some other # object. class Parent < Child include Enumerable # Constructor # @param parent if supplied, will be set as the parent of this object def initialize parent=nil super(parent) @children = [] end def add( object ) #puts "PARENT GOTS #{size} CHILDREN" object.parent = self @children << object #puts "PARENT NOW GOTS #{size} CHILDREN" object end alias :push :add alias :<< :push def unshift( object ) object.parent = self @children.unshift object end def delete( object ) found = false @children.delete_if {\|c\| c.equal?(object) and found = true } object.parent = nil if found found ? object : nil end def each(&block) @children.each(&block) end def delete_if( &block ) @children.delete_if(&block) end def delete_at( index ) @children.delete_at index end def each_index( &block ) @children.each_index(&block) end # Fetches a child at a given index # @param index the Integer index of the child to fetch def []( index ) @children[index] end alias :each_child :each # 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) def []=( args ) args[-1].parent = self @children[args[0..-2]] = args[-1] end # 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) 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 # 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) 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 def to_a @children.dup end # 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. def index( child ) count = -1 @children.find { \|i\| count += 1 ; i.hash == child.hash } count end # @return the number of children of this parent def size @children.size end alias :length :size # 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) def replace_child( to_replace, replacement ) @children.map! {\|c\| c.equal?( to_replace ) ? replacement : c } to_replace.parent = nil replacement.parent = self end # Deeply clones this object. This creates a complete duplicate of this # Parent, including all descendants. 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 alias :children :to_a def parent? true end end end Back

Edit File : parent.rb | Size : 4.33 KB

require "rexml/child"

module REXML
  # A parent has children, and has methods for accessing them.  The Parent
  # class is never encountered except as the superclass for some other
  # object.
  class Parent < Child
    include Enumerable

# Constructor
    # @param parent if supplied, will be set as the parent of this object
    def initialize parent=nil
      super(parent)
      @children = []
    end

def add( object )
      #puts "PARENT GOTS #{size} CHILDREN"
      object.parent = self
      @children << object
      #puts "PARENT NOW GOTS #{size} CHILDREN"
      object
    end

alias :push :add
    alias :<< :push

def unshift( object )
      object.parent = self
      @children.unshift object
    end

def delete( object )
      found = false
      @children.delete_if {|c| c.equal?(object) and found = true }
      object.parent = nil if found
      found ? object : nil
    end

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

def delete_if( &block )
      @children.delete_if(&block)
    end

def delete_at( index )
      @children.delete_at index
    end

def each_index( &block )
      @children.each_index(&block)
    end

# Fetches a child at a given index
    # @param index the Integer index of the child to fetch
    def []( index )
      @children[index]
    end

alias :each_child :each

# 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)
    def []=( *args )
      args[-1].parent = self
      @children[*args[0..-2]] = args[-1]
    end

# 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)
    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

# 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)
    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

def to_a
      @children.dup
    end

# 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.
    def index( child )
      count = -1
      @children.find { |i| count += 1 ; i.hash == child.hash }
      count
    end

# @return the number of children of this parent
    def size
      @children.size
    end

alias :length :size

# 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)
    def replace_child( to_replace, replacement )
      @children.map! {|c| c.equal?( to_replace ) ? replacement : c }
      to_replace.parent = nil
      replacement.parent = self
    end

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

alias :children :to_a

def parent?
      true
    end
  end
end

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