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Editing: node.rb

require 'rexml/xmltokens'

# [ :element, parent, name, attributes, children* ]
 # a = Node.new
 # a << "B" # => <a>B</a>
 # a.b # => <a>B</a>
 # a.b[1] # => <a>B<a>
 # a.b[1]["x"] = "y" # => <a>B</a>
 # a.b[0].c # => <a>B<c/></a>
 # a.b.c << "D" # => <a>B<c>D</c></a>
module REXML
 module Light
 # Represents a tagged XML element. Elements are characterized by
 # having children, attributes, and names, and can themselves be
 # children.
 class Node
 NAMESPLIT = /^(?:(#{XMLTokens::NCNAME_STR}):)?(#{XMLTokens::NCNAME_STR})/u
 PARENTS = [ :element, :document, :doctype ]
 # Create a new element.
 def initialize node=nil
 @node = node
 if node.kind_of? String
 node = [ :text, node ]
 elsif node.nil?
 node = [ :document, nil, nil ]
 elsif node[0] == :start_element
 node[0] = :element
 elsif node[0] == :start_doctype
 node[0] = :doctype
 elsif node[0] == :start_document
 node[0] = :document
 end
 end

def size
        if PARENTS.include? @node[0]
          @node[-1].size
        else
          0
        end
      end

def each
        size.times { |x| yield( at(x+4) ) }
      end

def name
        at(2)
      end

def name=( name_str, ns=nil )
        pfx = ''
        pfx = "#{prefix(ns)}:" if ns
        _old_put(2, "#{pfx}#{name_str}")
      end

def parent=( node )
        _old_put(1,node)
      end

def local_name
        namesplit
        @name
      end

def local_name=( name_str )
        _old_put( 1, "#@prefix:#{name_str}" )
      end

def prefix( namespace=nil )
        prefix_of( self, namespace )
      end

def namespace( prefix=prefix() )
        namespace_of( self, prefix )
      end

def namespace=( namespace )
        @prefix = prefix( namespace )
        pfx = ''
        pfx = "#@prefix:" if @prefix.size > 0
        _old_put(1, "#{pfx}#@name")
      end

def []( reference, ns=nil )
        if reference.kind_of? String
          pfx = ''
          pfx = "#{prefix(ns)}:" if ns
          at(3)["#{pfx}#{reference}"]
        elsif reference.kind_of? Range
          _old_get( Range.new(4+reference.begin, reference.end, reference.exclude_end?) )
        else
          _old_get( 4+reference )
        end
      end

def =~( path )
        XPath.match( self, path )
      end

# Doesn't handle namespaces yet
      def []=( reference, ns, value=nil )
        if reference.kind_of? String
          value = ns unless value
          at( 3 )[reference] = value
        elsif reference.kind_of? Range
          _old_put( Range.new(3+reference.begin, reference.end, reference.exclude_end?), ns )
        else
          if value
            _old_put( 4+reference, ns, value )
          else
            _old_put( 4+reference, ns )
          end
        end
      end

# Append a child to this element, optionally under a provided namespace.
 # The namespace argument is ignored if the element argument is an Element
 # object. Otherwise, the element argument is a string, the namespace (if
 # provided) is the namespace the element is created in.
 def << element
 if node_type() == :text
 at(-1) << element
 else
 newnode = Node.new( element )
 newnode.parent = self
 self.push( newnode )
 end
 at(-1)
 end

def node_type
        _old_get(0)
      end

def text=( foo )
        replace = at(4).kind_of?(String)? 1 : 0
        self._old_put(4,replace, normalizefoo)
      end

def root
        context = self
        context = context.at(1) while context.at(1)
      end

def has_name?( name, namespace = '' )
        at(3) == name and namespace() == namespace
      end

def children
        self
      end

def parent
        at(1)
      end

def to_s

end

private

def namesplit
        return if @name.defined?
        at(2) =~ NAMESPLIT
        @prefix = '' || $1
        @name = $2
      end

def namespace_of( node, prefix=nil )
        if not prefix
          name = at(2)
          name =~ NAMESPLIT
          prefix = $1
        end
        to_find = 'xmlns'
        to_find = "xmlns:#{prefix}" if not prefix.nil?
        ns = at(3)[ to_find ]
        ns ? ns : namespace_of( @node[0], prefix )
      end

def prefix_of( node, namespace=nil )
        if not namespace
          name = node.name
          name =~ NAMESPLIT
          $1
        else
          ns = at(3).find { |k,v| v == namespace }
          ns ? ns : prefix_of( node.parent, namespace )
        end
      end
    end
  end
end

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