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



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# File 'lib/www/delicious.rb', line 879

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) 


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# File 'lib/www/delicious.rb', line 907

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.



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# File 'lib/www/delicious.rb', line 894

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