1  module REXML
   2    module Formatters
   3      class Default
   4        # Prints out the XML document with no formatting -- except if id_hack is
   5        # set.
   6        #
   7        # ie_hack::
   8        #   If set to true, then inserts whitespace before the close of an empty
   9        #   tag, so that IE's bad XML parser doesn't choke.
  10        def initialize( ie_hack=false )
  11          @ie_hack = ie_hack
  12        end
  13 
  14        # Writes the node to some output.
  15        #
  16        # node::
  17        #   The node to write
  18        # output::
  19        #   A class implementing <TT>&lt;&lt;</TT>.  Pass in an Output object to
  20        #   change the output encoding.
  21        def write( node, output )
  22          case node
  23 
  24          when Document 
  25            if node.xml_decl.encoding != "UTF-8" && !output.kind_of?(Output)
  26              output = Output.new( output, node.xml_decl.encoding )
  27            end
  28            write_document( node, output )
  29 
  30          when Element
  31            write_element( node, output )
  32 
  33          when Declaration, ElementDecl, NotationDecl, ExternalEntity, Entity,
  34               Attribute, AttlistDecl
  35            node.write( output,-1 )
  36 
  37          when Instruction
  38            write_instruction( node, output )
  39 
  40          when DocType, XMLDecl
  41            node.write( output )
  42 
  43          when Comment
  44            write_comment( node, output )
  45 
  46          when CData
  47            write_cdata( node, output )
  48 
  49          when Text
  50            write_text( node, output )
  51 
  52          else
  53            raise Exception.new("XML FORMATTING ERROR")
  54 
  55          end
  56        end
  57 
  58        protected
  59        def write_document( node, output )
  60          node.children.each { |child| write( child, output ) }
  61        end
  62 
  63        def write_element( node, output )
  64          output << "<#{node.expanded_name}"
  65 
  66          node.attributes.each_attribute do |attr|
  67            output << " "
  68            attr.write( output )
  69          end unless node.attributes.empty?
  70 
  71          if node.children.empty?
  72            output << " " if @ie_hack
  73            output << "/" 
  74          else
  75            output << ">"
  76            node.children.each { |child|
  77              write( child, output )
  78            }
  79            output << "</#{node.expanded_name}"
  80          end
  81          output << ">"
  82        end
  83 
  84        def write_text( node, output )
  85          output << node.to_s()
  86        end
  87 
  88        def write_comment( node, output )
  89          output << Comment::START
  90          output << node.to_s
  91          output << Comment::STOP
  92        end
  93 
  94        def write_cdata( node, output )
  95          output << CData::START
  96          output << node.to_s
  97          output << CData::STOP
  98        end
  99 
 100        def write_instruction( node, output )
 101          output << Instruction::START.sub(/\\/u, '')
 102          output << node.target
 103          output << ' '
 104          output << node.content
 105          output << Instruction::STOP.sub(/\\/u, '')
 106        end
 107      end
 108    end
 109  end