Class: Syndication::TagSoup

Inherits:
Object
  • Object
show all
Defined in:
lib/syndication/tagsoup.rb

Overview

TagSoup is a tiny completely non-validating XML parser which implements the tag_start, tag_end and text methods of the REXML StreamListener interface.

It's designed for permissive parsing of RSS and Atom feeds; using it for anything more complex (like HTML with CSS and JavaScript) is not advised.

Class Method Summary (collapse)

Class Method Details

+ (Object) parse_stream(data, listener)

Parse data String and send events to listener



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# File 'lib/syndication/tagsoup.rb', line 16

def TagSoup.parse_stream(data, listener)
  data.scan(/(<\/[^>]*>|<[^>]*>|[^<>]*)/m) do |match|
    thing = match.first.strip
    if thing[0,1] == '<'
      # It's a tag_start or tag_end
      (tag,rest) = thing.match(/<\/?([^>\s]+)([^>]*)/)[1,2]
      if thing[1,1] == '/'
        listener.tag_end(tag)
      else
        # Parse the attr=val pairs
        pairs = Hash.new
        rest.scan(/([\w:]+)=("([^"]*)"|'([^']*)')/) {|a,j,v1,v2|
          if v1 == nil
            v = v2
          else
            v = v1
          end
          if a
            pairs[a] = v
          end
        }
        listener.tag_start(tag, pairs)
        # Tags with end tag build in, XML style
        if thing[-2,1] == '/'
          listener.tag_end(tag)
        end
      end
    else
      # It's text
      listener.text(CGI.unescapeHTML(thing))
    end
  end
end