Module: WWW::Delicious::XMLUtils

Included in:
REXML::Element
Defined in:
lib/www/delicious.rb

Overview

:nodoc:

Instance Method Summary collapse

Instance Method Details

#if_attribute_value(xmlattr, &block) ⇒ Object

Returns the xmlattr attribute value for current REXML::Element.

If block is given and attribute value is not nil, the content of the block is executed.

Examples

dom = REXML::Document.new('<a name="1"><b>foo</b><b>bar</b></a>')

dom.root.if_attribute_value(:name)
# => "1"

dom.root.if_attribute_value(:name) { |v| v.to_i }
# => 1

dom.root.if_attribute_value(:foo)
# => nil

dom.root.if_attribute_value(:name) { |v| v.to_i }
# => nil



872
873
874
875
876
877
878
879
880
 
# File 'lib/www/delicious.rb', line 872

def if_attribute_value(xmlattr, &block) #:nodoc:
  value = if attr = self.attribute(xmlattr.to_s)
      attr.value
    else
      nil
    end
  value = yield value if !value.nil? and block_given?
  value
end

#if_element(expression, &block) ⇒ Object

Executes the content of block on expression child of this element, if it exists. Returns the result or nil if xmlelement doesn’t exist.

Raises:

  • (LocalJumpError) 


900
901
902
903
904
905
906
907
 
# File 'lib/www/delicious.rb', line 900

def if_element(expression, &block)
  raise LocalJumpError, "no block given" unless block_given?
  if element = self.elements[expression.to_s]
    yield element
  else
    nil
  end
end

#if_element_value(expression, &block) ⇒ Object

Returns the value of expression child of this element, if it exists. If blog is given, block is called on expression element value and the result is returned.



887
888
889
890
891
892
893
 
# File 'lib/www/delicious.rb', line 887

def if_element_value(expression, &block)
  if_element(expression) do |element|
    value = element.text
    value = yield value if block_given?
    value
  end
end