remove the abstract stemmer class, because we only need an interface

lib/polecat/stemmer.rb

@@ -1,25 +0,0 @@
-module Polecat
-  # abstract class for stemmer
-  #
-  # This class can be used for inheritence for your own stemmer.
-  # A stemmer is responsible to convert an document into an array of fragments
-  # which then merged with the index. As every document can be built of
-  # different words and fragments, the stemmer is very important to get the
-  # best result when searching.
-  #
-  # Be warned, that you use the same stemmer for the index as for the search
-  # input!
-  #
-  # To build your own stemmer implement the methods #stem and #result.
-  class Stemmer
-    # stems the word
-    #
-    # This method changes the word into a form, which get's interted into the
-    # index.
-    # @param [Object] word word to stem
-    # @return [Object] the stemmed variant of the word or the same object
-    def stem word
-      raise NotImplementedError, 'please implement #stem'
-    end
-  end
-end

spec/stemmer/new_spec.rb

@@ -1,8 +0,0 @@
-require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')
-
-describe "Stemmer#new" do
-  it "creates a new stemmer" do
-    s = Polecat::Stemmer.new
-    s.class.should be(Polecat::Stemmer)
-  end
-end

spec/stemmer/stem_spec.rb

@@ -1,13 +0,0 @@
-require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')
-
-describe "Stemmer#stem" do
-  let (:s) { Polecat::Stemmer.new }
-
-  it "takes one argument" do
-    s.method(:stem).arity.should == 1
-  end
-
-  it "raises an error, because it's an abstract class" do
-    lambda { s.stem "word" }.should raise_error(NotImplementedError)
-  end
-end