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[booh] / lib / booh / rexml / parsers / ultralightparser.rb
1 require 'booh/rexml/parsers/streamparser'
2 require 'booh/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