Class: Rhopalic::Analysis

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

Instance Method Summary collapse

Constructor Details

#initialize(dictionary = nil) ⇒ Analysis

Returns a new instance of Analysis.



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# File 'lib/rhopalic/analysis.rb', line 10

def initialize(dictionary=nil)
  @dictionary = dictionary
end

Instance Method Details

#analyze_phrase(phrase) ⇒ Object 



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# File 'lib/rhopalic/analysis.rb', line 14

def analyze_phrase(phrase)
  words = []
  indices = []
  syllable_counts = []
  in_dictionary = []
  is_letter_rhopalic = true
  is_syllable_rhopalic = true

  # Explanation of this regex:
  # - [:alpha:] matches alphabetic characters throughout the whole unicode set
  # - we use word boundaries (\b) to delineate words
  # - however, word boundaries don't match before and after underscore, so we
  #   explicitly treat that as a word boundary
  # - using positive lookahead (?=...) because otherwise we'd miss words where
  #   they are only separated by an underscore
  phrase.scan(/(\b|_)([[:alpha:]\d]+)(?=\b|_)/) do
    match = Regexp.last_match
    word = match[2]
    index = match.begin(0)
    is_number = false

    # Bail out on words that contain numbers, unless we can pronounce the number
    # as a whole word.
    word.match(/\d+/) do |num_match|
      return nil if num_match[0].size != word.size
      is_number = true
    end

    # Checking whether the previous and this word form a known contraction
    # or possessive.
    if !indices.empty? && (phrase[indices.last + words.last.length] == "'") &&
        (index == indices.last + words.last.length + 1)
      contraction = words.last + "'" + word
      if (syllable_count = CONTRACTIONS[contraction.downcase]) || word.downcase == "s"
        words[-1] = contraction
        if syllable_count
          syllable_counts[-1] = syllable_count
          in_dictionary[-1] = true
        end

        is_letter_rhopalic = false unless word_sequence_rhopalic?(words)
        is_syllable_rhopalic = false unless syllable_sequence_rhopalic?(syllable_counts)
        return nil unless is_letter_rhopalic || is_syllable_rhopalic
        next
      end
    end

    # If the words is a series of digits, count syllables based on spelling the
    # number out, but ignore it if the number doesn't translate to a single word.
    syllable_counting_word = word
    if is_number
      number_as_words = word.to_i.to_words
      if number_as_words.match(/^\w+$/)
        syllable_counting_word = number_as_words
      else
        return nil
      end
    end

    if @dictionary
      syllable_count = @dictionary.syllable_count(syllable_counting_word)
      in_dictionary.push(true) unless syllable_count.nil?
    end
    if !syllable_count
      syllable_count = Lingua::EN::Syllable.syllables(syllable_counting_word)
      in_dictionary.push(false)
    end

    words.push(word)
    indices.push(match.begin(0))
    syllable_counts.push(syllable_count)

    is_letter_rhopalic = false unless word_sequence_rhopalic?(words)
    is_syllable_rhopalic = false unless syllable_sequence_rhopalic?(syllable_counts)
    return nil unless is_letter_rhopalic || is_syllable_rhopalic
  end

  return Phrase.new(phrase, is_letter_rhopalic, is_syllable_rhopalic, words, indices,
      syllable_counts, in_dictionary)
end