From: Jens Wille <jens.wille@...>
Date: 2008-12-08T23:22:46+09:00
Subject: Re: Proximity searches in Ruby

hi!

Robert Klemme [2008-12-07 13:23]:
> I played a bit around and came up with a more involved version
> which works with arbitrary numbers of words but still fits into a
> few lines of code.
here's my take on the task: Poor Man's Search ;-)

  <http://github.com/blackwinter/pms>

it's a different approach with support for boolean operators as well
as - back to topic! - proximity operators. pms builds an index for
the input documents and stores the token positions along with the
document numbers. still pretty rough, but working...

> text = <<EOT
> Hello world, how are you today? I said "Hello"
> to the other guy but he would not answer although
> all the world could hear me.
> EOT
> 
> proximity_search text, 3, "hello", "World" do |a,b|
>   printf "Found at char positions %3d and %3d\n", a, b
> end

  require 'pms/ext'

  search = text.search('hello').near('world', 3)

  p search.results
  #=> [0]

  p search.results_with_positions
  #=> {0=>[0, 8]}

  p search.matches
  #=> ["Hello world, how are you today? I said \"Hello\"\n"]

cheers
jens