Class: Brstemmer::Stemmer

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

Instance Method Summary collapse

Constructor Details

#initialize(word) ⇒ Stemmer

Returns a new instance of Stemmer.



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# File 'lib/brstemmer.rb', line 519

def initialize word
  @suffix_removed = false
  @word = word
  @rules = RULES.freeze

  self
end

Instance Method Details

#apply_rules_by_name(name) ⇒ Object 



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# File 'lib/brstemmer.rb', line 540

def apply_rules_by_name(name)
  rules = @rules.detect { |rule| rule[:properties][:name] == name }
  rules[:rules].each do |rule|
    if rule[2].nil?
      self.apply_suffix rule[0], rule[1], rule[3]
    else
      self.apply_suffix rule[0], rule[1], rule[2], rule[3]
    end
  end

  @word
end

#apply_suffix(suffix, size, replaced = '', excpts) ⇒ Object

@params:

suffix   => Suffix to remove
size     => Minimal size of stem
replaced => Replace suffix
excpt    => Exceptions words or suffix list



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# File 'lib/brstemmer.rb', line 558

def apply_suffix(suffix, size, replaced='', excpts)
  aux_word = @word
  if @word =~ /#{suffix}$/
    @word.gsub!(/#{suffix}$/, replaced) if
        (not excpts.nil? and excpts.detect { |expt| @word == expt }.nil? or excpts.nil?) and @word.length - suffix.length >= size
  end

  @suffix_removed = true if aux_word != @word
end

#render ⇒ Object 



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# File 'lib/brstemmer.rb', line 527

def render
  @word.downcase!

  self.apply_rules_by_name('plural_reduction') if @word[-1] == 's'
  self.apply_rules_by_name('adverb_reduction')
  self.apply_rules_by_name('feminine_reduction') if @word[-1] == 'a' or @word[-1] == "ã"
  self.apply_rules_by_name('augmentative_reduction')
  self.apply_rules_by_name('noun_reduction')
  self.apply_rules_by_name('verb_reduction') unless @suffix_removed
  self.apply_rules_by_name('vowel_reduction') unless @suffix_removed
  self.apply_rules_by_name('accent_reduction')
end