class XHTMLDiff

Constants

BLOCK_CONTAINERS

Attributes

Public Class Methods

Source

# File lib/xhtmldiff.rb, line 55
def diff(a, b)
        if a == b
                return a.deep_clone
        end
        if REXML::HashableElementDelegator === a and REXML::HashableElementDelegator === b
                o = REXML::Element.new(a.name)
                o.add_attributes  a.attributes
                hd = self.new(o)
                Diff::LCS.traverse_balanced(a, b, hd)
                o
        elsif REXML::Text === a and REXML::Text === b
                o = REXML::Element.new('span')
                aa = a.value.split(/\s/)
                ba = b.value.split(/\s/)
                hd = XHTMLTextDiff.new(o)
                Diff::LCS.traverse_balanced(aa, ba, hd)
                o
        else
                raise ArgumentError.new("both arguments must be equal or both be elements. a is #{a.class.name} and b is #{b.class.name}")
        end
end

new (output)

Source

# File lib/xhtmldiff.rb, line 82
def initialize(output)
  @output = output
end

Public Instance Methods

change (event)

Source

# File lib/xhtmldiff.rb, line 96
      def change(event)
              begin
                      sd = diff(event.old_element, event.new_element)
              rescue ArgumentError
                      sd = nil
              end
              if sd and (ratio = (Float(rs = sd.to_s.gsub(%r{<(ins|del)>.*</\1>}, '').size) / bs = Math.max(event.old_element.to_s.size, event.new_element.to_s.size))) > 0.5
                      @output << sd
              else
                      @output << wrap(event.old_element, 'del')
                      @output << wrap(event.new_element, 'ins')
              end
end

choose_event (event, element, tag)

Source

# File lib/xhtmldiff.rb, line 115
      def choose_event(event, element, tag)
end

diff (a, b)

Source

# File lib/xhtmldiff.rb, line 78
def diff(a, b)
        self.class.diff(a,b)
end

discard_a (event)

Source

# File lib/xhtmldiff.rb, line 92
def discard_a(event)
              @output << wrap(event.old_element, 'del') 
end

This will be called when there is an element in A that isn’t in B

discard_b (event)

Source

# File lib/xhtmldiff.rb, line 111
def discard_b(event)
              @output << wrap(event.new_element, 'ins')
      end

This will be called when there is an element in B that isn’t in A

match (event)

Source

# File lib/xhtmldiff.rb, line 87
def match(event)
  @output << event.old_element.deep_clone if event.old_element
end

This will be called with both elements are the same

wrap (element, tag = nil)

Source

# File lib/xhtmldiff.rb, line 118
def wrap(element, tag = nil)
        if tag 
                el = Element.new tag
                el << element.deep_clone
        else
                el = element.deep_clone
        end
        el
end