Class: LoremIpsum::Generator

Inherits:
Object
  • Object
show all
Defined in:
lib/lorem-ipsum.rb

Instance Method Summary collapse

Constructor Details

#initialize(data_files = [], opts = { :max_ngraph => 3 }) ⇒ Generator

Returns a new instance of Generator.



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# File 'lib/lorem-ipsum.rb', line 5

def initialize(data_files = [], opts = { :max_ngraph => 3 })
  @letter_count = { :count => 0 }
  @max_ngraph = opts[:max_ngraph]

  data_files.each { |file| analyze(file) }
end

Instance Method Details

#analyze(filename) ⇒ Object 



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# File 'lib/lorem-ipsum.rb', line 12

def analyze(filename)
  File.open(filename) do |file|
    while (line = file.gets)
      # todo - not handling punctuation
      line = line.strip.downcase.gsub(/[^a-z ]/, '') << ' '

      word = "^"
      line.chars do |c|
        word << c
        n = [@max_ngraph, word.length].min
        ngraph = word[-n..-1]

        ngraph.chars.inject(@letter_count) do |hash, char|
          hash[char] ||= { :count => 0 }
          hash[char][:count] += 1
          hash = hash[char]
        end

        if c == ' '
          word = "^"
        end
      end
    end
  end
end

#generate(options) ⇒ Object 



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# File 'lib/lorem-ipsum.rb', line 38

def generate(options)
  options[:paras] ||= 1
  options[:variance] ||= 0
  options[:words] ||= 100

  str = ""
  1.upto(options[:paras]) do |i|
    str << next_paragraph(options[:words], options[:variance]) << "\n"
  end

  str
end

#next_char(prev) ⇒ Object 



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# File 'lib/lorem-ipsum.rb', line 86

def next_char(prev)
  # Need to make sure our words don't get too long. Not everyone is Charles
  # Dickens, even in fake-Latin land. These parameters seem to look nice,
  # but salt to taste.
  return ' ' if prev.length > 4 && rand(9 + prev.length) < prev.length

  n = [@max_ngraph-1, prev.length].min
  prev_ngraph = prev[-n..-1]

  # If we don't have statistics for this n-graph, just use the stats
  # for the (n-1)-graph
  n_count = nil
  until n_count
    n_count = prev_ngraph.chars.inject(@letter_count) do |hash, char|
      break if ! hash[char]
      hash = hash[char]
    end
    prev_ngraph = prev_ngraph[1..-1]

    n_count = @letter_count if ! prev_ngraph
  end
  n_count = n_count.reject { |k,v| k == :count || prev.empty? && k == ' ' }

  num_letters ||= n_count.values.inject(0) { |s,c| s += c[:count] }
  index = rand(num_letters + 1)

  "abcdefghijklmnopqrstuvqxyz ".chars do |c|
    index -= n_count[c] && n_count[c][:count] || 0
    return c if index <= 0
  end
end

#next_paragraph(word_count, variance = 0) ⇒ Object 



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# File 'lib/lorem-ipsum.rb', line 51

def next_paragraph(word_count, variance = 0)
  str = ""

  if variance != 0
    range = (2 * variance * word_count / 100.0).to_i
    word_count = word_count + rand(range) - range / 2
  end

  while word_count > 0
    sentence_count = [rand(10) + 5, word_count].min
    str << next_sentence(sentence_count)
    word_count -= sentence_count
  end

  str << "\n"
end

#next_sentence(word_count) ⇒ Object 



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# File 'lib/lorem-ipsum.rb', line 68

def next_sentence(word_count)
  str = ""
  1.upto(word_count) do |i|
    word = next_word
    word.capitalize! if i == 1
    word.gsub!(/ /,'. ') if i == word_count
    str << word
  end

  str
end

#next_word ⇒ Object 



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# File 'lib/lorem-ipsum.rb', line 80

def next_word
  word = "^"
  word << next_char(word) while word[-1..-1] != ' '
  word[1..-1]
end