lib/rexml/parsers/ultralightparser.rb

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