Class: Resemblance::Shingling

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

Instance Method Summary collapse

Constructor Details

#initialize(content = '', options = {}) ⇒ Shingling

Returns a new instance of Shingling.



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# File 'lib/shingling.rb', line 5

def initialize(content = '', options = {})
  @content = content
  @shingle_length = options[:shingle_length] || 5
  @stop_words = options[:stop_words] || []
  @downcase = options[:downcase] || false
  @replace_chars = options[:replace_chars] || {}
end

Instance Method Details

#each_shingles ⇒ Object 



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# File 'lib/shingling.rb', line 13

def each_shingles
  word = ""
  char_flag = false
  shingling = []
  position_end_words = []
  position_start, position_end = 0, 0

  @content.each_char do |char|
    char = @replace_chars[char] if @replace_chars.key? char
    if char !~ /[[:word:]]+/
      char_flag = true
    else
      if char_flag
        if !stop_word?(word) || word !~ /\S/
          shingling << (@downcase ? Unicode::downcase(word) : word)
          word = ""
          position_end_words << position_end
          if shingling.size == @shingle_length
            yield(shingling, position_start, position_end - 1)
            position_start = position_end_words.shift
            shingling.shift
          end
        end
        char_flag = false
      end
      word << char
    end
    position_end += 1
  end        
end