Class: XML::Node

Inherits:
Object
  • Object
show all
Defined in:
lib/libxml_additions.rb

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(meth, *args) ⇒ Object 



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# File 'lib/libxml_additions.rb', line 8

def method_missing( meth, *args )
  # If one of the child nodes matches the string value of
  # the method call that triggered this method_missing(),
  # then why not use it?
  #
  # Furthermore, set an instance variable and create an
  # instance method so we don't have to come back here again.
  #
  # To avoid the collision of a node name with a built-in XML::Node
  # instance method (e.g., XML::Node#children would mask a <children> node),
  # you can refer to the node as [node]_in_the_xml
  # E.G.,
  # n = XML::Node
  # n.children # => calls the XML::Node children instance method
  # n.children_in_the_xml # => looks for child nodes of n that happen to be named "children"
  node_name = meth.to_s =~ /^(.*)_in_the_xml$/ ? $1 : meth.to_s

  var_name = "@#{meth.to_s}_var"
  self.instance_eval( "
def #{meth.to_s}(force=false)
  if force || #{var_name}.nil?
#{var_name} = []
self.each_child { |c| #{var_name} << c if c.name == '#{node_name}' }
#{var_name} = #{var_name}.first if #{var_name}.size == 1
  end
  #{var_name}
end", __FILE__, __LINE__ )
  self.send( meth, *args )
end