lib/rexml/parsers/lightparser.rb

   1 require 'rexml/parsers/streamparser'
   2 require 'rexml/parsers/baseparser'
   3 require 'rexml/light/node'
   4
   5 module REXML
   6         module Parsers
   7                 class LightParser
   8                         def initialize stream
   9                                 @stream = stream
  10                                 @parser = REXML::Parsers::BaseParser.new( stream )
  11                         end
  12
  13       def add_listener( listener )
  14         @parser.add_listener( listener )
  15       end
  16
  17       def rewind
  18         @stream.rewind
  19         @parser.stream = @stream
  20       end
  21
  22                         def parse
  23                                 root = context = [ :document ]
  24                                 while true
  25                                         event = @parser.pull
  26                                         case event[0]
  27                                         when :end_document
  28                                                 break
  29                                         when :end_doctype
  30                                                 context = context[1]
  31                                         when :start_element, :start_doctype
  32                                                 new_node = event
  33                                                 context << new_node
  34                                                 new_node[1,0] = [context]
  35                                                 context = new_node
  36                                         when :end_element, :end_doctype
  37                                                 context = context[1]
  38                                         else
  39                                                 new_node = event
  40                                                 context << new_node
  41                                                 new_node[1,0] = [context]
  42                                         end
  43                                 end
  44                                 root
  45                         end
  46                 end
  47
  48                 # An element is an array.  The array contains:
  49                 #  0                    The parent element
  50                 #  1                    The tag name
  51                 #  2                    A hash of attributes
  52                 #  3..-1        The child elements
  53                 # An element is an array of size > 3
  54                 # Text is a String
  55                 # PIs are [ :processing_instruction, target, data ]
  56                 # Comments are [ :comment, data ]
  57                 # DocTypes are DocType structs
  58                 # The root is an array with XMLDecls, Text, DocType, Array, Text
  59         end
  60 end