Hi! On Wed, Apr 23, 2008 at 12:18:12PM -0400, S D wrote: [..] > My current problem, a custom tokenizer I've written in Ruby does not > properly create an index (or at least searches on the index don't work). > Using test_token_stream() I have verified that my tokenizer properly creates > the token_stream; certainly each Token's attributes are set properly. > Nevertheless, simple searches return zero results.
Could you have a look at your index with the ferret_browser utility? It allows you to check what exactly has been indexed and that maybe leads to the root of your problem. What does your analyzer, where you use the Tokenizer, look like? Is your next() method below being called and working correctly when test driving your analyzer i.e. in irb? Cheers, Jens > The essence of my tokenizer is to skip beyond XML tags in a file and break > up and return text components as tokens. I use this approach as opposed to > an Hpricot approach because I need to keep track of the location of the text > with respect to XML tags since after a search for a phrase I'll want to > extract the nearby XML tags as they contain important context. My tokenizer > (XMLTokenizer) contains a the obligatory initialize, next and text methods > (shown below) as well as a lot of parsing methods that are called at the top > level by the method XMLTokenizer.get_next_token which is the primary action > within next. I didn't add the details of get_next_token as I'm assuming that > if each token produced by get_next_token has the proper attributes then it > shouldn't be the cause of the problem. What more should I be looking for? > I've been looking for a custom tokenizer written in Ruby to model after; any > suggestions? > > def initialize(xmlText) > @xmlText = xmlText.gsub(/[;,!]/, ' ') > @currPtr = 0 > @currWordStart = nil > @currTextStart = 0 > @nextTagStart = 0 > @startOfTextRegion = 0 > > @currTextStart = \ > XMLTokenizer.skip_beyond_current_tag(@currPtr, @xmlText) > @nextTagStart = \ > XMLTokenizer.skip_beyond_current_text(@currTextStart, @xmlText) > @currPtr = @currTextStart > @startOfTextRegion = 1 > end > > def next > tkn = get_next_token > if tkn != nil > puts "%5d |%4d |%5d | %s" % [tkn.start, tkn.end, tkn.pos_inc, > tkn.text] > end > return tkn > end > > def text=(text) > initialize(text) > @xmlText > end > > Below is text from a previous, related message that shows that StopFiltering > is not working: > > >* I've written a tokenizer/analyzer that parses a file extracting tokens and > *>* operate this analyzer/tokenizer on ASCII data consisting of XML files (the > *>* tokenizer skips over XML elements but maintains relative positioning). > I've > *>* written many units tests to check the produced token stream and was > *>* confident that the tokenizer was working properly. Then I noticed two > *>* problems: > *>* > *>* 1. StopFilter (using English stop words) does not properly filter the > *>* token stream output from my tokenizer. If I explicitly pass an > array of stop > *>* words to the stop filter it still doesn't work. If I simply switch my > *>* tokenizer to a StandardTokenizer the stop words are > appropriately filtered > *>* (of course the XML tags are treated differently). > *> > >* 2. When I try a simple search no results come up. I can see that my > *>* tokenizer is adding files to the index but a simple search (using > *>* Ferret::Index::Index.search_each) produces no results. > * > > > Any suggestions are appreciated. > > John > _______________________________________________ > Ferret-talk mailing list > [email protected] > http://rubyforge.org/mailman/listinfo/ferret-talk -- Jens Krämer Finkenlust 14, 06449 Aschersleben, Germany VAT Id DE251962952 http://www.jkraemer.net/ - Blog http://www.omdb.org/ - The new free film database _______________________________________________ Ferret-talk mailing list [email protected] http://rubyforge.org/mailman/listinfo/ferret-talk
